Safety lock valve and nuclear equipment including same

Abstract

This safety lock valve comprises: a safety lock valve body having a first flow communication hole, a second flow communication hole, and a pressure communication hole; a flow path switching unit which has a switching flow path formed therein and is movably disposed inside the safety lock valve body so as to move between a first state, in which the switching flow path is connected to the first and second flow communication holes, and a second state, in which the switching flow path is disconnected from the first and second flow communication holes; and a flow path switching elastic member which provides elastic force to the flow path switching unit in a direction moving the flow path switching unit to the first state.

Description

Safety locking valves and nuclear facilities containing them

[0001] The present invention relates to a safety locking valve and a nuclear power plant including the same. This research is related to the "Development of a High-Reliability Valve Concept for Innovative SMR Emergency Core Cooling System Application" (Project Identification Number: 1415187085, Project Number: 20228540000010) project, which was conducted at the Korea Atomic Energy Research Institute (KAERI) with support from the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and funded by the Ministry of Trade, Industry and Energy (Government) in 2023.

[0002] Some small modular reactors employ a natural circulation system using a main valve to achieve emergency core cooling without operator intervention or emergency power assistance in the event of an accident. This natural circulation system, using a main valve, circulates a cooling fluid, such as coolant, between the reactor and the containment vessel within which the reactor is housed.

[0003] The main valve is opened and closed by the operating fluid. When the reset valve opens, the operating fluid is supplied to the main valve, closing the main valve. When the trip valve opens, the operating fluid is discharged from the main valve, opening the main valve.

[0004] Meanwhile, a malfunction prevention valve connected to the main valve prevents the main valve from opening even if the operator accidentally operates the trip valve during normal reactor operation. This malfunction prevention valve closes the main valve due to the pressure difference between the reactor and the containment vessel even if the operator accidentally operates the trip valve. Since the main valve remains closed, the reactor can be maintained in a sealed state. Some conventional malfunction prevention valves employ a mechanical actuation method, but implementing the valve operating mechanism requires high reliability and accuracy of the mechanical components.

[0005] Embodiments of the present invention have been invented against the background described above, and are intended to provide a safety locking valve having a relatively simple configuration and being easy to manufacture, and a nuclear power facility including the same.

[0006] According to a first aspect of the present invention, a safety locking valve comprises: a safety locking valve body having a first flow communication hole, a second flow communication hole, and a pressure communication hole formed therein; a flow path switching portion movably disposed within the safety locking valve body so as to move between a first state in which a switching path is formed and is connected to the first flow communication hole and the second flow communication hole, and a second state in which the switching path is blocked from being connected to the first flow communication hole and the second flow communication hole; and a flow path switching elastic member providing elastic force to the flow path switching portion in a direction in which the flow path switching portion is moved to the first state, wherein the pressure communication hole is formed such that a fluid that pressurizes the flow path switching portion is introduced into the safety locking valve body in a direction in which the flow path switching portion is moved to the second state.

[0007] A space for moving the flow diversion unit is formed inside the safety lock valve body in which the flow diversion unit is movably arranged, and the space for moving the flow diversion unit may include a first pressure space connected to the pressure communication hole and a second pressure space connected to the outside of the safety lock valve body.

[0008] The safety lock valve body may further have an external communication hole formed to connect the outside of the safety lock valve body and the second pressure space so that fluid can flow into and out of the second pressure space when the volume of the second pressure space changes.

[0009] The safety lock valve body may further include a flow conversion bellows that is arranged in the flow conversion section moving space to be connected to the flow conversion section and blocks communication between the first pressure space and the second pressure space.

[0010] The above-mentioned euro conversion unit may include a euro conversion member in which the conversion path is formed; and a moving drive member to which the euro conversion member and the euro conversion bellows are connected.

[0011] The above-mentioned euro conversion elastic member can be arranged between the safety lock valve body on the external communication hole side and the moving driving member.

[0012] The above-mentioned euro-conversion bellows is connected to the safety lock valve body on the side of the external communication hole so that the inside thereof is in communication with the external communication hole, the euro-conversion elastic member is arranged inside the euro-conversion bellows, the first pressure space may include the euro-conversion part movement space outside the euro-conversion bellows, and the second pressure space may include the euro-conversion part movement space inside the euro-conversion bellows.

[0013] The above safety lock valve body may further have a body pressure equalization passage formed to connect the first pressure space on one side of the above-described euro switching section and the first pressure space on the other side of the above-described euro switching section.

[0014] The above-mentioned euro-conversion bellows is connected to the safety lock valve body and the movable driving member between the above-mentioned euro-conversion member, and the above-mentioned first pressure space may include the euro-conversion part moving space that is connected to the inside of the euro-conversion bellows and the pressure communication hole, and the above-mentioned second pressure space may include the euro-conversion part moving space that is connected to the outside of the euro-conversion bellows and the external communication hole.

[0015] The above-mentioned euro-switching member may be provided with a first member pressure equalization passage that connects the first pressure space on one side of the euro-switching member and the first pressure space on the other side of the euro-switching member, and the above-mentioned movable driving member may be provided with a second member pressure equalization passage that connects the second pressure space on one side of the movable driving member and the second pressure space on the other side of the movable driving member.

[0016] An overpressure prevention hole may be further formed in the above safety lock valve body.

[0017] The above overpressure prevention hole can be formed in the safety lock valve body so as to be connected to the pressure communication hole.

[0018] In the above-mentioned euro conversion section, an overpressure prevention passage communicating with the overpressure prevention hole and the second flow communication hole in the second state may be further formed.

[0019] A nuclear power facility according to a first aspect of the present invention comprises: a nuclear reactor; a containment vessel in which the nuclear reactor is disposed; a main valve disposed inside the containment vessel so as to be connected to the interior of the nuclear reactor and configured to open and close so as to allow or prevent the interior of the nuclear reactor and the interior of the containment vessel from communicating with each other, the main valve being configured to close when a working fluid is supplied and open when the working fluid is discharged; a reset valve that opens so as to supply the working fluid to the main valve; a trip valve that opens so as to discharge the working fluid from the main valve; a safety lock valve that allows the working fluid to flow to the main valve when the reset valve is opened and allows the working fluid to be discharged from the main valve when the trip valve is opened, and is configured so as not to open the main valve when the trip valve is opened during normal operation of the nuclear reactor; And it includes an operating fluid passage connected between two or more of the main valve, the reset valve, the trip valve, and the safety lock valve so that the operating fluid can flow, and the safety lock valve is configured to be switched between a first state that allows the operating fluid to flow to the main valve or to be discharged from the main valve and a second state that does not allow the operating fluid to flow.

[0020] The safety locking valve comprises a safety locking valve body having a first flow communication hole connected to the reset valve and the trip valve, a second flow communication hole connected to the main valve, and a pressure communication hole connected to the inside of the reactor; a flow switching part arranged inside the safety locking valve body so as to move between a first state in which a switching flow path is formed and the switching flow path is connected to the first flow communication hole and the second flow communication hole, and a second state in which the switching flow path is blocked from being connected to the first flow communication hole and the second flow communication hole; and a flow switching elastic member providing an elastic force to the flow switching part in a direction in which the flow switching part is moved to the first state, and a force due to a difference between a pressure inside the reactor and a pressure inside the containment vessel in a direction in which the flow switching part is moved to the second state may be provided to the flow switching part.

[0021] When the pressure inside the reactor becomes higher than the design pressure, which is higher than the normal operating pressure during normal operation of the reactor, an overpressure relief valve that opens together with the trip valve so that the working fluid is discharged from the main valve may be further included.

[0022] The main valve may further include a safety lock auxiliary check valve configured to allow the flow of fluid from inside the containment vessel toward the inside of the reactor when the main valve is opened, but not allow the flow of fluid from inside the reactor toward the inside of the containment vessel.

[0023] The above safety lock auxiliary check valve may be connected to the main valve, connected to the inside of the reactor and the main valve, or disposed on the main valve so as to be connected to the inside of the reactor, or disposed on a reactor connection pipe connecting the inside of the reactor and the main valve.

[0024] The main valve may include a main valve body having a reactor connection path connected to the inside of the reactor, a main valve opening / closing hole connected to the reactor connection path and communicating with the inside of the containment vessel, and connected to the safety lock valve; and a main valve plunger movably arranged on the main valve body to open / close the main valve opening / closing hole.

[0025] The above safety lock auxiliary check valve may include a check valve support configured to be internally connected to the main valve opening and closing hole and having a check valve opening and closing hole formed therein that is connected to the inside of the containment vessel; and a check valve opening and closing member rotatably arranged inside the check valve support to open and close the check valve opening and closing hole.

[0026] The above safety lock auxiliary check valve may have a containment vessel communication hole formed to communicate with the inside of the containment vessel so as to allow the flow of fluid from inside the reactor toward the inside of the containment vessel when the check valve opening / closing hole is closed by the check valve opening / closing member.

[0027] The above safety lock auxiliary check valve may include a check valve support member having a check valve opening / closing hole formed therein and arranged in the reactor connection path or a reactor connection pipe connecting the inside of the reactor and the reactor connection path; and a check valve opening / closing member rotatably arranged in the reactor connection path or the reactor connection pipe to open and close the check valve opening / closing hole.

[0028] The above safety lock auxiliary check valve may include a check valve support having a check valve flow path formed therein, which is connected to the main valve opening / closing hole and communicates with the inside of the containment vessel or is connected to the inside of the reactor and the reactor connection path; a check valve opening / closing member movably arranged on the check valve support to open / close the check valve flow path; and a check valve elastic member that elastically supports the check valve opening / closing member in a direction that closes the check valve flow path.

[0029] The above check valve opening / closing member may have a containment vessel communication hole formed therein that communicates with the inside of the containment vessel to allow the flow of fluid from inside the reactor toward the inside of the containment vessel when the check valve flow path is closed by the check valve opening / closing member.

[0030] According to embodiments of the present invention, there is an effect that a safety locking valve included in a nuclear power plant can have a relatively simple configuration and be easy to manufacture.

[0031] FIG. 1 is a drawing showing a nuclear power plant according to a first embodiment of the present invention.

[0032] FIG. 2 is a drawing showing a safety locking valve of a nuclear power plant according to the first embodiment of the present invention.

[0033] Figures 3 and 4 are drawings showing the operation of the nuclear power plant of Figure 1 and the safety lock valve of Figure 2 during initial operation of the reactor.

[0034] Figures 5 and 6 are drawings showing the normal operation of the nuclear power plant of Figure 1 and the reactor of the safety lock valve of Figure 2.

[0035] Figures 7 and 8 are drawings showing the operation of the nuclear power plant of Figure 1 and the safety lock valve of Figure 2 when the trip valve is unintentionally opened during normal operation of the reactor.

[0036] Figures 9 and 10 are drawings showing the operation of the nuclear power plant of Figure 1 and the safety lock valve of Figure 2 in the event of an accident in the reactor.

[0037] Fig. 11 is a drawing showing a safety locking valve of a nuclear power plant according to a second embodiment of the present invention.

[0038] Figure 12 is a drawing showing a nuclear power plant according to a third embodiment of the present invention.

[0039] Fig. 13 is a drawing showing a safety locking valve of a nuclear power plant according to a third embodiment of the present invention.

[0040] Figures 14 and 15 are drawings showing the operation of the nuclear power plant of Figure 12 and the safety lock valve of Figure 13 when the trip valve is unintentionally opened during normal operation of the reactor.

[0041] Figures 16 and 17 are drawings showing the operation of the nuclear power plant of Figure 12 and the safety lock valve of Figure 13 when the reactor is overpressured.

[0042] Fig. 18 is a drawing showing a safety locking valve of a nuclear power plant according to the fourth embodiment of the present invention.

[0043] Figure 19 is a drawing showing a nuclear power plant according to the fifth embodiment of the present invention.

[0044] Figure 20 is a drawing showing a nuclear power plant according to the sixth embodiment of the present invention.

[0045] FIGS. 21 to 23 are drawings showing examples of a safety lock auxiliary check valve for a nuclear power facility according to the seventh embodiment of the present invention. FIGS. 21 and 22 show that a containment vessel communication hole is formed in a safety lock auxiliary check valve support, and FIG. 23 shows that a containment vessel communication hole is formed in a safety lock auxiliary check valve opening / closing member.

[0046] Figure 24 is a drawing showing a nuclear power plant according to the eighth embodiment of the present invention.

[0047] Figures 25 and 26 are drawings showing a safety lock auxiliary check valve of a nuclear power plant according to the ninth embodiment of the present invention.

[0048] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0049] In addition, when explaining the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0050] Additionally, when it is said that a component is 'connected to', 'supported by', 'supplied by', or 'transmitted to' another component, it should be understood that it may be directly connected to, supported by, supplied by, or transmitted to that other component, but there may also be other components present in between.

[0051] The terminology used herein is intended solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0052] Additionally, please note that the terms "top," "bottom," "upper surface," "lower surface," "upper side," "lower side," and "side" used in this specification are based on the illustrations in the drawings and may be expressed differently if the orientation of the object changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the size of each component does not entirely reflect the actual size.

[0053] Additionally, terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by such terms. These terms are used solely to distinguish one component from another.

[0054] The term "comprising" as used in the specification means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0055] Hereinafter, with reference to FIGS. 1 and 2, a specific configuration of a safety lock valve (600) according to a first embodiment of the present invention and a nuclear power plant (1) including the same will be described. In the nuclear power plant (1), in the event of an accident in the nuclear reactor (100), a cooling fluid such as coolant may be naturally circulated within the interior of the nuclear reactor (100) and the containment vessel (200), so that the core (not shown) of the nuclear reactor (100) may be passively cooled. In addition, in the nuclear power plant (1), even if the trip valve (500) is unintentionally opened during normal operation of the nuclear reactor (100), the cooling fluid such as coolant may not be circulated between the interior of the nuclear reactor (100) and the containment vessel (200). A nuclear power plant (1) may include a nuclear reactor (100), a containment vessel (200), a main valve (300), a reset valve (400), a trip valve (500), a safety lock valve (600), and a working fluid passage (700).

[0056] In a nuclear reactor (100), nuclear fission can occur using nuclear fuel containing radioactive materials such as uranium. In addition, the nuclear reactor (100) can use the heat generated by nuclear fission to evaporate secondary water in a steam generator (not shown) and generate steam. The steam can be supplied to steam turbines, desalination plants, and other steam-using applications outside the nuclear reactor (100). A reactor connection pipe (101) can be provided in the nuclear reactor (100) to connect the interior of the nuclear reactor (100) to the main valve (300).

[0057] The containment vessel (200) can prevent the leakage of nuclear fission products, such as radiation, generated by nuclear fission in the reactor (100) to the outside. The containment vessel (200) can surround the reactor (100). In other words, the reactor (100) can be placed inside the containment vessel (200). The containment vessel (200) can be made of steel.

[0058] The main valve (300) can be opened and closed to allow or prevent the interior of the reactor (100) and the interior of the containment vessel (200) from communicating with each other. The main valve (300) can be placed on the side and the top of the reactor (100), respectively. During normal operation of the reactor (100), the main valve (300) may be closed so that the interior of the reactor (100) and the interior of the containment vessel (200) are not connected. In the event of an accident in the reactor (100), the main valve (300) placed on the side and the top of the reactor (100) can be opened. The main valve (300) placed on the top of the reactor (100) can be opened so that the vapor-state cooling fluid inside the reactor (100) can be discharged from the reactor (100). The vapor-state cooling fluid discharged from the reactor (100) can be condensed by the inner wall of the containment vessel (200) or the passive containment vessel cooling system and filled inside the containment vessel (200). When the level of the condensed cooling fluid filled inside the containment vessel (200) becomes higher than the level of the cooling fluid inside the reactor (100), the cooling fluid filled inside the containment vessel (200) can be introduced into the reactor (100) through the main valve (300) arranged on the side of the reactor (100) due to the hydrostatic pressure difference. In other words, when the main valve (300) arranged on the side and top of the reactor (100) is opened, the cooling fluid changes state between the inside of the reactor (100) and the inside of the containment vessel (200) and is naturally circulated, so that the core of the reactor (100) can be passively cooled.

[0059] The main valve (300) may be positioned inside the containment vessel (200) so as to be connected to the interior of the reactor (100). In addition, the main valve (300) may be configured to close when the working fluid is supplied and open when the working fluid is discharged. The main valve (300) may include a main valve body (310), a main valve plunger (320), and a main valve elastic member (330).

[0060] The main valve body (310) can be connected to the interior of the reactor (100) and to the safety lock valve (600). The main valve body (310) can be connected to the interior of the reactor (100) by a reactor connection pipe (101). In addition, the main valve body (310) can be directly connected to the safety lock valve (600). In addition, the main valve body (310) can also be connected to the safety lock valve (600) by a separate working fluid flow passage (not shown) included in the working fluid passage section (700).

[0061] A plunger movement space (311), a reactor connection path (312), a main valve opening / closing hole (313), and a safety lock valve connection path (314) may be formed in the main valve body (310). A main valve plunger (320) may be movably arranged in the plunger movement space (311). The reactor connection path (312) may be connected to the inside of the reactor (100) by a reactor connection pipe (101). In addition, the reactor connection path (312) may be connected to the plunger movement space (311). The main valve opening / closing hole (313) may be connected to the reactor connection path (312). In addition, the main valve opening / closing hole (313) may be connected to the inside of the containment vessel (200). The main valve opening hole (313) can be opened and closed by the main valve plunger (320). The safety lock valve connection path (314) can be connected to the plunger movement space (311) and the safety lock valve (600). The safety lock valve connection path (314) can be connected to a second fluid communication hole (613) formed in a later-described safety lock valve body (610) included in the safety lock valve (600). The safety lock valve connection path (314) can be directly connected to the second fluid communication hole (613). In addition, the safety lock valve connection path (314) can also be connected to the second fluid communication hole (613) by a separate fluid flow path of the fluid passage section (700).

[0062] The main valve plunger (320) may be movably arranged in the main valve body (310) so as to communicate or not communicate between the inside of the reactor (100) and the inside of the containment vessel (200). The main valve plunger (320) may be movably arranged in the plunger movement space (311) of the main valve body (310). Depending on the movement position of the main valve plunger (320) in the plunger movement space (311), the main valve opening / closing hole (313) may be opened / closed by one side of the main valve plunger (320). For example, the lower part of the main valve plunger (320) may open / close the main valve opening / closing hole (313). A main valve communication passage (321) may be formed in the main valve plunger (320). The reactor connection path (312) and the safety lock valve connection path (314) can be connected through the main valve connection path (321).

[0063] The main valve elastic member (330) can elastically support the main valve plunger (320). The main valve elastic member (330) can apply elastic force to the main valve plunger (320) in a direction in which one side of the main valve plunger (320) opens the main valve opening / closing hole (313).

[0064] The reset valve (400) can be opened to supply the working fluid to the main valve (300). When the reset valve (400) is opened and the working fluid is supplied to the main valve (300), the main valve (300) can be closed. The reset valve (400) can be connected to the working fluid supply source (2) by a working fluid supply passage (710) included in the working fluid passage (700), which will be described later. In addition, the reset valve (400) can be connected to a first working fluid flow passage (720) included in the working fluid passage (700), which will be described later. In addition, the reset valve (400) is included in the working fluid passage (700) and is connected to the safety lock valve (600) through a second working fluid flow passage (730) which is connected to the first working fluid flow passage (720), and can be connected to the main valve (300) through the safety lock valve (600). In addition, the reset valve (400) can be connected to the main valve (300) by the safety lock valve (600) being switched to the first state which will be described later. Meanwhile, the working fluid may have the same properties as the cooling fluid inside the reactor (100), the working fluid may be water, and the working fluid supply source (2) may be water stored inside or outside the containment vessel (200). In other words, the working fluid supply source (2) may be disposed inside the containment vessel (200) or outside the containment vessel (200). However, the working fluid supply source (2) is not particularly limited.

[0065] The reset valve (400) may be configured to close when no electricity is applied and open when electricity is applied. For example, the reset valve (400) may include a valve body having an opening / closing hole formed therein, a plunger movably arranged inside the valve body, an elastic member that applies an elastic force to the plunger in a direction to close the opening / closing hole, and a solenoid that applies a driving force to the plunger in a direction to open the opening / closing hole. In addition, when electricity is not applied to the solenoid, the plunger may move by the elastic force of the elastic member to close the opening / closing hole of the valve body. In addition, when electricity is applied to the solenoid, the plunger may move by overcoming the elastic force of the elastic member to open the opening / closing hole of the valve body. The opening / closing of the reset valve (400) may be performed by a reset valve controller connected to the solenoid of the reset valve (400). The reset valve controller can be implemented by a computing device including a microprocessor, memory, etc., and the method of implementation is obvious to those skilled in the art, so further detailed description is omitted.

[0066] The trip valve (500) can be opened to discharge the working fluid from the main valve (300). The main valve (300) can be opened by opening the trip valve (500) and discharging the working fluid from the main valve (300). The trip valve (500) can be connected to the first working fluid flow passage (720) of the working fluid passage section (700). In addition, the trip valve (500) can be connected to the safety lock valve (600) through the second working fluid flow passage (730) connected to the first working fluid flow passage (720) and can be connected to the main valve (300) through the safety lock valve (600). In addition, the trip valve (500) can be connected to the main valve (300) by switching the safety lock valve (600) to the first state. Additionally, the trip valve (500) can be connected to the inside of the containment vessel (200) by a third operating fluid flow passage (750) included in the operating fluid passage (700), which will be described later.

[0067] The trip valve (500) may be configured to open when no electricity is applied and close when electricity is applied. For example, the trip valve (500) may include a valve body having an opening / closing hole formed therein, a plunger movably arranged inside the valve body, an elastic member that applies an elastic force to the plunger in a direction to open the opening / closing hole, and a solenoid that applies a driving force to the plunger in a direction to close the opening / closing hole. In addition, when electricity is not applied to the solenoid, the plunger may move by the elastic force of the elastic member to open the opening / closing hole of the valve body. In addition, when electricity is applied to the solenoid, the plunger may overcome the elastic force of the elastic member and move to close the opening / closing hole of the valve body. The opening / closing of the trip valve (500) may be performed by a trip valve controller connected to the solenoid of the trip valve (500). The trip valve controller can be implemented by a computing device including a microprocessor, memory, etc., and the method of implementation is obvious to those skilled in the art, so further detailed description is omitted.

[0068] The safety lock valve (600) may be configured to allow the working fluid to flow to the main valve (300) when the reset valve (400) is opened, to allow the working fluid to be discharged from the main valve (300) when the trip valve (500) is opened, and to prevent the main valve (300) from opening when the trip valve (500) is opened during normal operation of the reactor (100). In addition, the safety lock valve (600) may be configured to switch between a first state and a second state. The first state of the safety lock valve (600) may be defined as a state that allows the working fluid to flow to the main valve (300) or to be discharged from the main valve (300), and the second state may be defined as a state that does not allow the working fluid to flow to the main valve (300) or to be discharged from the main valve (300). The first state and the second state may be named the connected state and the blocked state, respectively.

[0069] The safety locking valve (600) may include a safety locking valve body (610), a flow diversion part (620), a flow diversion elastic member (630), and a flow diversion bellows (640). In addition, the safety locking valve (600) may be configured so that, in the direction in which the flow diversion part (620) moves to the second state, a force due to a difference between the pressure inside the safety locking valve body (610) and the external pressure, which is connected to the pressure communication hole (614) described later, is provided to the flow diversion part (620). In other words, the safety locking valve (600) may be configured so that, in the direction in which the flow diversion part (620) moves to the second state, a force due to a difference between the pressure inside the reactor (100) to which the pressure communication hole (614) is connected and the pressure inside the containment vessel (200) outside the safety locking valve (600) is provided to the flow diversion part (620).

[0070] The safety lock valve body (610) can be connected to the reset valve (400) and the trip valve (500). The safety lock valve body (610) can be connected to the reset valve (400) and the trip valve (500) through the working fluid passage (700). The safety lock valve body (610) can be connected to the second working fluid flow passage (730) of the working fluid passage (700). In addition, the safety lock valve body (610) can be connected to the reset valve (400) and the trip valve (500) through the second working fluid flow passage (730) and the first working fluid flow passage (720) which is connected to the second working fluid flow passage (730) and connected to the reset valve (400) and the trip valve (500). In addition, the safety lock valve body (610) may be connected to the interior of the reactor (100). The safety lock valve body (610) may be connected to the interior of the reactor (100) by being included in the working fluid passage (700) and connected to a reactor connection passage (740) to be described later and connected to the interior of the reactor (100). In addition, the safety lock valve body (610) may be connected to the main valve (300). The safety lock valve body (610) may be directly connected to the main valve (300). The safety lock valve body (610) may be directly connected to the main valve body (310) of the main valve (300). The safety lock valve body (610) may be directly connected to the safety lock valve connection passage (314) of the main valve body (310). The safety lock valve body (610) may be connected to the main valve (300) through a separate operating fluid flow passage of the operating fluid passage section (700). The safety lock valve body (610) may be formed with a flow passage moving space (611), a first flow communication hole (612), a second flow communication hole (613), a pressure communication hole (614), an external communication hole (615), a body pressure equalization passage (616), and a member support portion (617).

[0071] The Euro conversion part movement space (611) can be formed inside the safety lock valve body (610) so that the Euro conversion part (620) can be positioned movably. The Euro conversion part movement space (611) can include a first pressure space (611-1) and a second pressure space (611-2).

[0072] The first pressure space (611-1) may be connected to the interior of the reactor (100). A pressure communication hole (614) may be connected to the first pressure space (611-1). In addition, the first pressure space (611-1) may be connected to the interior of the reactor (100) through the pressure communication hole (614) and the reactor connection passage (740) of the working fluid passage (700) which is connected to the reactor connection pipe (101) which is connected to the pressure communication hole (614) and connected to the interior of the reactor (100). In addition, the pressure inside the reactor (100) may be transmitted to the first pressure space (611-1) through the reactor connection pipe (101), the reactor connection passage (740), and the pressure communication hole (614). In other words, the pressure in the first pressure space (611-1) can be equal to the pressure inside the reactor (100).

[0073] The second pressure space (611-2) may be communicated to the outside of the safety lock valve (600). The pressure of the second pressure space (611-2) may be equal to the pressure outside the safety lock valve (600). In other words, the second pressure space (611-2) may be communicated to the inside of the containment vessel (200) in which the safety lock valve (600) is disposed. In addition, the pressure of the second pressure space (611-2) may be equal to the pressure inside the containment vessel (200) in which the safety lock valve (600) is disposed. The second pressure space (611-2) may be communicated to the external communication hole (615). In addition, the second pressure space (611-2) may be communicated to the inside of the containment vessel (200) which is outside the safety lock valve (600) through the external communication hole (615).

[0074] The first fluid communication hole (612) can be connected to the reset valve (400) and the trip valve (500). The first fluid communication hole (612) can be connected to the reset valve (400) and the trip valve (500) through the working fluid passage (700). The first fluid communication hole (612) can be connected to the second working fluid flow passage (730) of the working fluid passage (700). The first fluid communication hole (612) can be connected to the reset valve (400) and the trip valve (500) through the second working fluid flow passage (730) and the first working fluid flow passage (720) which is connected to the second working fluid flow passage (730) and connected to the reset valve (400) and the trip valve (500). In addition, the first fluid communication hole (612) may be connected to a switching passage (621-1) to be described later, which is formed in the flow switching section (620) in the first state of the safety lock valve (600). In addition, the first fluid communication hole (612) may not be connected to the switching passage (621-1) in the second state of the safety lock valve (600).

[0075] The second fluid communication hole (613) can be connected to the main valve (300). The second fluid communication hole (613) can be connected to the safety lock valve connection path (314) of the main valve (300). The second fluid communication hole (613) can be directly connected to the safety lock valve connection path (314). The second fluid communication hole (613) can also be connected to the safety lock valve connection path (314) through a separate working fluid flow path of the working fluid passage (700). In addition, the second fluid communication hole (613) can be connected to the switching path (621-1) of the flow path switching unit (620) in the first state of the safety lock valve (600). Additionally, the second fluid communication hole (613) may not be connected to the switching path (621-1) in the second state of the safety lock valve (600).

[0076] The pressure communication hole (614) may be formed so that a fluid pressurizing the flow diversion part (620) flows into the safety lock valve body (610) in the direction in which the flow diversion part (620) moves to the second state. The pressure communication hole (614) may be connected to the interior of the reactor (100). The pressure communication hole (614) may be connected to the interior of the reactor (100) by a reactor connection passage (740) of a working fluid passage (700) connected to a reactor connection pipe (101) connected to the interior of the reactor (100). The pressure communication hole (614) may be connected to the first pressure space (611-1). In addition, the pressure inside the reactor (100) may be transmitted to the first pressure space (611-1) through the pressure communication hole (614). In other words, through the pressure communication hole (614), the pressure in the first pressure space (611-1) can be made equal to the pressure inside the reactor (100).

[0077] The external communication hole (615) can communicate the outside of the safety lock valve (600) with the second pressure space (611-2). In other words, the external communication hole (615) can communicate the inside of the containment vessel (200) outside the safety lock valve (600) with the second pressure space (611-2). The external communication hole (615) can communicate the inside of the containment vessel (200) outside the safety lock valve (600) with the second pressure space (611-2). In addition, through the external communication hole (615), when the volume of the second pressure space (611-2) changes, fluid can flow into and out of the second pressure space (611-2). In addition, the pressure outside the safety lock valve (600) and the pressure of the second pressure space (611-2) can become equal through the external communication hole (615). In other words, the pressure of the second pressure space (611-2) can be made equal to the pressure inside the containment vessel (200) through the external communication hole (615).

[0078] The body pressure equalization passage (616) can connect the first pressure space (611-1) on one side of the flow path conversion part (620) and the first pressure space (611-1) on the other side of the flow path conversion part (620) with each other. The body pressure equalization passage (616) can connect the first pressure spaces (611-1) on one side and the other side of the flow path conversion part (620) with each other so that the pressures of the first pressure spaces (611-1) on one side and the other side of the flow path conversion part (620) can be equalized. For example, the first pressure space (611-1) can include the first pressure space (611-1) on the upper side of the flow path conversion part (620) and the first pressure space (611-1) on the lower side of the flow path conversion part (620). In addition, the body pressure equalization passage (616) is connected to the first pressure space (611-1) on the upper side of the flow path conversion part (620) and the first pressure space (611-1) on the lower side of the flow path conversion part (620), so that the first pressure space (611-1) on the upper side of the flow path conversion part (620) and the first pressure space (611-1) on the lower side of the flow path conversion part (620) can be communicated with each other. In addition, the pressure of the first pressure space (611-1) on the upper side of the flow path conversion part (620) and the pressure of the first pressure space (611-1) on the lower side of the flow path conversion part (620) can be equalized.

[0079] The member support (617) may be arranged in the passage diversion part moving space (611) to support a part of the passage diversion part (620). For example, in the first state of the safety locking valve (600), the member support (617) may support a part of the lower surface of the moving drive plate (622-2) included in the later-described moving drive member (622) included in the passage diversion part (620). In addition, in the second state of the safety locking valve (600), the member support (617) may support a part of the upper surface of the later-described passage diversion member (621) included in the passage diversion part (620). A support member through-hole (617-1) may be formed in the member support (617). A movable connecting member (622-1) to be described later, which is included in the movable driving member (622) of the euro conversion member (620), can movably pass through the support member passage hole (617-1).

[0080] The euro switching unit (620) can be movably arranged inside the safety lock valve body (610) so as to move between the first state and the second state. The euro switching unit (620) can be movably arranged in the euro switching unit movement space (611) of the safety lock valve body (610) so as to move between the first state and the second state.

[0081] A switching passage (621-1) may be formed in the flow path switching unit (620). The switching passage (621-1) may be connected to the first flow communication hole (612) and the second flow communication hole (613) in the first state of the flow path switching unit (620). In addition, the switching passage (621-1) may be connected to the second working fluid flow passage (730) of the working fluid passage (700) connected to the first flow communication hole (612) in the first state of the flow path switching unit (620). In addition, the switching passage (621-1) may be connected to the reset valve (400) and the trip valve (500) to which the first working fluid flow passage (720) is connected, through the first working fluid flow passage (720) connected to the second working fluid flow passage (730) in the first state. In addition, the switching path (621-1) can be connected to the main valve (300) connected to the second flow communication hole (613) in the first state of the flow conversion unit (620). In addition, the switching path (621-1) can be connected to the safety lock valve connection path (314) of the main valve (300) connected to the second flow communication hole (613) in the first state of the flow conversion unit (620). In other words, the switching path (621-1) can be connected to the reset valve (400), the trip valve (500), and the main valve (300) in the first state of the flow conversion unit (620).

[0082] The switching path (621-1) may be blocked from communicating with the first flow communication hole (612) and the second flow communication hole (613) in the second state of the flow conversion unit (620). In other words, the switching path (621-1) may not be connected to the reset valve (400), the trip valve (500), and the main valve (300) in the second state of the flow conversion unit (620). The flow conversion unit (620) may include a flow conversion member (621) and a moving driving member (622).

[0083] The flow switching member (621) may be movably arranged within the safety lock valve body (610) to move between the first state and the second state. The flow switching member (621) may be movably arranged in the flow switching section movement space (611) of the safety lock valve body (610) to move between the first state and the second state. A switching path (621-1) may be formed in the flow switching member (621).

[0084] The movable drive member (622) is connected to the euro conversion member (621) so as to move together with the euro conversion member (621), and a euro conversion bellows (640) may be connected. The movable drive member (622) may include a movable connection member (622-1) and a movable drive plate (622-2).

[0085] The movable connecting member (622-1) can be connected to the euro conversion member (621). In addition, the movable connecting member (622-1) can be moved by passing through the support member through hole (617-1) of the support member (617).

[0086] The movable drive plate (622-2) can be connected to the movable connecting member (622-1). In addition, a flow conversion bellows (640) can be connected to the movable drive plate (622-2). The elastic force of the flow conversion elastic member (630) can act on the movable drive plate (622-2) in a direction in which it moves to the first state. In addition, the pressure outside the safety lock valve (600), which is the pressure of the second pressure space (611-2), can act on the movable drive plate (622-2) in a direction in which it moves to the first state. In other words, the pressure inside the containment vessel (200), which is the pressure of the second pressure space (611-2), can act on the movable drive plate (622-2) in a direction in which it moves to the first state.

[0087] The euro-switching elastic member (630) can provide elastic force to the euro-switching member (620) in the direction in which the euro-switching member (620) moves to the first state. The euro-switching elastic member (630) can be arranged between the safety locking valve body (610) on the external communication hole (615) side and the moving driving member (622) of the euro-switching member (620). The euro-switching elastic member (630) can be arranged in the euro-switching member moving space (611) between the safety locking valve body (610) on the external communication hole (615) side and the moving driving member (622) of the euro-switching member (620). The euro conversion elastic member (630) can be placed in the euro conversion moving space (611) between the safety lock valve body (610) on the external communication hole (615) side and the moving driving plate (622-2) of the moving driving member (622). The euro conversion elastic member (630) can be placed inside the euro conversion bellows (640).

[0088] The euro conversion bellows (640) is arranged in the euro conversion part moving space (611) so as to be connected to the safety locking valve body (610) and the euro conversion part (620), and can block the communication between the first pressure space (611-1) and the second pressure space (611-2). The euro conversion bellows (640) can be connected to the safety locking valve body (610) on the side of the external communication hole (615) and the moving drive member (622) of the euro conversion part (620) so as to be connected to the external communication hole (615) on the inside. The euro conversion bellows (640) can be connected to the safety locking valve body (610) on the side of the external communication hole (615) and the moving drive plate (622-2) of the moving drive member (622) so as to be connected to the external communication hole (615) on the inside. Additionally, the Euro conversion part movement space (611) outside the Euro conversion bellows (640) may be included in the first pressure space (611-1), and the Euro conversion part movement space (611) inside the safety lock bellows (640) may be included in the second pressure space (611-2).

[0089] The working fluid passage (700) can be connected to allow working fluid to flow between two or more of the main valve (300), the reset valve (400), the trip valve (500), and the safety lock valve (600). The working fluid passage (700) can include a working fluid supply passage (710), a first working fluid flow passage (720), a second working fluid flow passage (730), a reactor connection passage (740), and a third working fluid flow passage (750).

[0090] The working fluid supply passage (710) can provide a passage through which the working fluid flows between the working fluid supply source (2) in which the working fluid is stored and the reset valve (400). The working fluid supply passage (710) can be a flow pipe through which the working fluid flows, and is connected to the working fluid supply source (2) and the reset valve (400).

[0091] The first working fluid flow passage (720) can provide a passage through which the working fluid flows between the reset valve (400) and the trip valve (500). The first working fluid flow passage (720) can be a flow pipe connected to the reset valve (400) and the trip valve (500) and through which the working fluid flows.

[0092] The second working fluid flow passage (730) may provide a passage through which the working fluid flows between the first working fluid flow passage (720) and the safety lock valve (600). The second working fluid flow passage (730) may be a flow pipe through which the working fluid flows, and is connected to the first working fluid flow passage (720) and the safety lock valve (600). The second working fluid flow passage (730) may be connected to the first working fluid flow passage (720) and the first flow communication hole (612) of the safety lock valve (600).

[0093] The reactor connection passage (740) can provide a passage for fluid to flow between the safety lock valve (600) and the interior of the reactor (100). The reactor connection passage (740) can be a fluid pipe that is connected to the safety lock valve (600) and the interior of the reactor (100) and through which the fluid flows. The reactor connection passage (740) can be connected to a pressure communication hole (614) of the safety lock valve (600) and a reactor connection pipe (101) connected to the interior of the reactor (100).

[0094] The third working fluid flow passage (750) may provide a passage through which the working fluid flows between the trip valve (500) and the interior of the containment vessel (200). The third working fluid flow passage (750) may be a flow pipe connected to the trip valve (500) and the interior of the containment vessel (200) and through which the working fluid flows.

[0095] Hereinafter, with reference to FIGS. 3 to 10, the operation and effect of a nuclear power facility (1) having the configuration described above will be described.

[0096] Referring to FIGS. 3 and 4, during initial operation of the reactor (100) of the nuclear power facility (1), the reset valve (400) may be opened and the trip valve (500) may be closed. For example, the reset valve (400) may be opened by applying electricity to the reset valve (400) through the reset valve controller. In addition, the trip valve (500) may be closed by applying electricity to the trip valve (500) through the trip valve controller. By this operation, the working fluid of the working fluid supply source (2) may be supplied to the safety lock valve (600) through the working fluid supply passage (710), the reset valve (400), the first working fluid flow passage (720), and the second working fluid flow passage (730).

[0097] Meanwhile, since the reactor (100) is in the initial stage of operation, the pressure inside the reactor (100) may be lower than the normal operating pressure, which is the pressure during normal operation. Therefore, the difference between the pressure inside the reactor (100) and the pressure inside the containment vessel (200) may be less than a predetermined pressure difference. In addition, the difference between the pressure in the first pressure space (611-1) of the safety lock valve (600) and the pressure in the second pressure space (611-2) may also be less than the predetermined pressure difference. In other words, the difference between the pressure in the first pressure space (611-1) and the pressure in the second pressure space (611-2) may be less than the predetermined pressure difference, which is the pressure difference between the pressure inside the reactor (100) and the pressure inside the containment vessel (200) during normal operation of the reactor (100). Additionally, the force due to the difference between the pressure of the first pressure space (611-1) and the pressure of the second pressure space (611-2) may be less than the elastic force of the euro-switching elastic member (630).

[0098] In addition, the flow diversion unit (620) can be moved to the first state by the elastic force of the flow diversion elastic member (630) acting on the flow diversion unit (620). In other words, the flow diversion unit (620) can be moved to the first state in which the diversion flow path (621-1) is connected to the first flow communication hole (612) and the second flow communication hole (613) of the safety lock valve body (610). For example, the flow diversion unit (620) can be moved downward by the elastic force of the flow diversion elastic member (630) acting on the moving drive plate (622-2), so as to become the first state in which the diversion flow path (621-1) is connected to the first flow communication hole (612) and the second flow communication hole (613) of the safety lock valve body (610). Accordingly, the operating fluid supplied to the safety lock valve (600) can flow through the first flow communication hole (612), the switching path (621-1), and the second flow communication hole (613) and be supplied to the main valve (300).

[0099] When the working fluid is supplied to the main valve (300), the working fluid flows through the safety lock valve connection path (314) connected to the second flow communication hole (613) of the safety lock valve (600), and the force due to the supply pressure of the working fluid can be applied to the main valve plunger (320). In addition, the main valve plunger (320) can be moved to close the main valve opening / closing hole (313) by overcoming the elastic force of the main valve elastic member (330) due to the force due to the supply pressure of the working fluid, thereby closing the main valve (300). When the main valve (300) is closed, the reset valve (400) can be closed. For example, the reset valve (400) can be closed by not applying electricity to the reset valve (400) through the reset valve controller.

[0100] Referring to FIGS. 5 and 6, during normal operation of the reactor (100), the pressure inside the reactor (100) can rise to the normal operation pressure. Therefore, the difference between the pressure inside the reactor (100) and the pressure inside the containment vessel (200) can be greater than or equal to a predetermined pressure difference. In addition, the difference between the pressure in the first pressure space (611-1) of the safety lock valve (600) and the pressure in the second pressure space (611-2) can also be greater than or equal to the predetermined pressure difference. In addition, the force due to the difference between the pressure in the first pressure space (611-1) and the pressure in the second pressure space (611-2) can be greater than the elastic force of the flow-through elastic member (630).

[0101] In addition, the flow diversion part (620) can be moved to the second state by a force due to the difference between the pressure of the first pressure space (611-1) and the pressure of the second pressure space (611-2) acting on the flow diversion part (620). In other words, the flow diversion part (620) can be moved to the second state in which the switching flow path (621-1) is not connected to the first flow communication hole (612) and the second flow communication hole (613) of the safety lock valve body (610). For example, the flow diversion part (620) can be moved upward by a force due to the difference between the pressure of the first pressure space (611-1) acting on the flow diversion member (621) and the pressure of the second pressure space (611-2) acting on the moving drive plate (622-2) of the moving drive member (622). In addition, the euro switching part (620) can be in a second state in which the switching path (621-1) is not connected to the first flow communication hole (612) and the second flow communication hole (613) of the safety lock valve body (610). In addition, the euro switching elastic member (630) can be compressed by a force resulting from the difference between the pressure of the first pressure space (611-1) acting on the euro switching member (621) and the pressure of the second pressure space (611-2) acting on the moving drive plate (622-2) of the moving drive member (622).

[0102] Referring to FIGS. 7 and 8, the trip valve (500) may be opened unintentionally due to an operator's mistake or the like during normal operation of the reactor (100). In other words, the trip valve (500) may be opened unintentionally due to an operator's mistake or the like while the pressure of the reactor (100) is at the normal operating pressure. However, since the reactor (100) is operating normally, the pressure of the reactor (100) can be maintained at the normal operating pressure. Accordingly, the difference between the pressure inside the reactor (100) and the pressure inside the containment vessel (200) may be greater than or equal to a predetermined pressure difference. In addition, the difference between the pressure of the first pressure space (611-1) and the pressure of the second pressure space (611-2) of the safety lock valve (600) may also be greater than or equal to a predetermined pressure difference.

[0103] In addition, a force greater than a predetermined pressure difference can continue to act on the flow switching unit (620). In addition, the flow switching unit (620) can continue to maintain the second state in which the switching flow path (621-1) is not connected to the first flow communication hole (612) and the second flow communication hole (613) due to a force greater than a predetermined pressure difference acting on the flow switching unit (620). Therefore, even if the trip valve (500) opens due to a mistake by the driver or the like, the flow switching unit (620) can continue to maintain the second state, so the main valve (300) may not open. In other words, malfunction can be prevented.

[0104] Referring to FIGS. 9 and 10, in the event of an accident in the reactor (100), the trip valve (500) may be opened. For example, the trip valve (500) may be opened by not applying electricity to the trip valve (500) through the trip valve controller.

[0105] In the event of an accident in the reactor (100), the pressure inside the reactor (100) may become lower than the normal operating pressure. Therefore, the difference between the pressure inside the reactor (100) and the pressure inside the containment vessel (200) may be less than a predetermined pressure difference. In addition, the difference between the pressure in the first pressure space (611-1) and the pressure in the second pressure space (611-2) of the malfunction prevention valve (600) may also be less than the predetermined pressure difference. In addition, the force due to the difference between the pressure in the first pressure space (611-1) and the pressure in the second pressure space (611-2) may be less than the elastic force of the flow diversion elastic member (630). In addition, the flow diversion unit (620) may be moved to the first state by the elastic force of the flow diversion elastic member (630) acting on the flow diversion unit (620). In other words, the flow path switching unit (620) can be moved to a first state in which the switching flow path (621-1) is connected to the first flow communication hole (612) and the second flow communication hole (613) of the safety lock valve body (610). For example, the flow path switching unit (620) can be moved downward by the elastic force of the flow conversion elastic member (630) acting on the moving drive plate (622-2) to become a first state in which the switching flow path (621-1) is connected to the first flow communication hole (612) and the second flow communication hole (613) of the safety lock valve body (610).

[0106] Accordingly, the working fluid of the main valve (300) can be discharged from the main valve (300). In other words, the working fluid of the main valve plunger movement space (311) of the main valve (300) can be discharged from the main valve (300) through the safety lock valve connection path (314) of the main valve (300). In addition, the main valve plunger (320) of the main valve (300) can be moved by the elastic force of the main valve elastic member (330) so that the main valve opening / closing hole (313) opens. In other words, the main valve (300) can be opened. When the main valve (300) is opened, the cooling fluid inside the containment vessel (200) can be recirculated into the reactor (100), thereby achieving emergency core cooling. The working fluid discharged from the main valve (300) can flow to the trip valve (500) through the second flow communication hole (613), the switching path (621-1), the first flow communication hole (612), the second working fluid flow passage (730), and the first working fluid flow passage (720) of the safety lock valve (600). The working fluid that has flowed to the trip valve (500) can flow into the containment vessel (200) through the third working fluid flow passage (750).

[0107] In this way, the first embodiment of the nuclear power plant (1) has the effect that the safety lock valve (600) has a relatively simple configuration and can be easily manufactured.

[0108] Meanwhile, in addition to this configuration, according to the second embodiment of the present invention, the euro conversion bellows (640) can be connected to the safety lock valve body (610) between the movable driving member (622) and the euro conversion member (621) and the movable driving member (622).

[0109] Hereinafter, a second embodiment will be described with reference to FIG. 11. In describing the second embodiment of the present invention, compared to the above-described embodiment, there is a difference in that the euro conversion bellows (640) is connected to the safety lock valve body (610) and the movable driving member (622) between the movable driving member (622) and the euro conversion member (621). This difference will be mainly described, and the same description and drawing reference numerals will be used in the above-described embodiments.

[0110] Referring to FIG. 11, the euro conversion bellows (640) can be connected to the safety lock valve body (610) and the movable driving member (622) between the movable driving member (622) and the euro conversion member (621). For example, a bellows connection (618) can be arranged in the euro conversion member moving space (611) between the movable driving member (622) and the euro conversion member (621) below the member support member (617). In addition, the euro conversion bellows (640) can be connected to the bellows connection (618) and the movable driving plate (622-2) of the movable driving member (622).

[0111] The first pressure space (611-1) may include a flow conversion part moving space (611) that is connected to the inside of the flow conversion bellows (640) and the pressure communication hole (614), and the second pressure space (611-2) may include a flow conversion part moving space (611) that is connected to the outside of the flow conversion bellows (640) and the external communication hole (615).

[0112] In addition, a first member pressure equalization passage (621-2) may be formed in the flow diversion member (621) to connect the first pressure space (611-1) on one side of the flow diversion member (621) and the first pressure space (611-1) on the other side of the flow diversion member (621) with each other. For example, the first pressure space (611-1) may include the first pressure space (611-1) on the upper side of the flow diversion member (621) and the first pressure space (611-1) on the lower side of the flow diversion member (621). In addition, the first member pressure equalization passage (621-1) may be formed in the flow diversion member (621) to be connected to the first pressure space (611-1) on the upper side of the flow diversion member (621) and the first pressure space (611-1) on the lower side of the flow diversion member (621). In addition, the first pressure equalization passage (621-1) can connect the first pressure space (611-1) on the upper side of the flow diversion member (621) and the first pressure space (611-1) on the lower side of the flow diversion member (621) to each other. In addition, the pressure of the first pressure space (611-1) on the upper side of the flow diversion member (621) and the pressure of the first pressure space (611-1) on the lower side of the flow diversion member (621) can be equalized.

[0113] In addition, a second member pressure equalization passage (622-21) may be formed in the movable driving member (622) to connect a second pressure space (611-2) on one side of the movable driving member (622) and a second pressure space (611-2) on the other side of the movable driving member (622) with each other. For example, the second pressure space (611-2) may include a second pressure space (611-2) on the upper side of the movable driving plate (622-2) of the movable driving member (622) and a second pressure space (611-2) on the lower side of the movable driving plate (622-2). In addition, the second member pressure equalization flow path (622-21) may be formed in the movable drive plate (622-2) to be connected to the second pressure space (611-2) on the upper side of the movable drive plate (622-2) and the second pressure space (611-2) on the lower side of the movable drive plate (622-2). In addition, the second member pressure equalization flow path (622-21) may communicate the second pressure space (611-2) on the upper side of the movable drive plate (622-2) and the second pressure space (611-2) on the lower side of the movable drive plate (622-2). In addition, the pressure of the second pressure space (611-2) on the upper side of the movable drive plate (622-2) and the pressure of the second pressure space (611-2) on the lower side of the movable drive plate (622-2) may be equal to each other. Meanwhile, even without the second pressure equalization passage (622-21), the pressure in the second pressure space (611-2) on one side of the moving drive member (622) and the pressure in the second pressure space (611-2) on the other side of the moving drive member (622) can be made equal to each other. In this case, the second pressure equalization passage (622-21) can be omitted.

[0114] Meanwhile, in addition to these configurations, according to the third embodiment of the present invention, an overpressure prevention hole (619) is further formed in the safety lock valve body (610), the operating fluid passage (700) further includes a fourth operating fluid flow passage (760) and a fifth operating fluid flow passage (770), and may further include an overpressure prevention valve (800).

[0115] Hereinafter, a third embodiment will be described with reference to FIGS. 12 to 17. In describing the third embodiment of the present invention, compared to the above-described embodiments, there is a difference in that an overpressure prevention hole (619) is further formed in the safety lock valve body (610), the operating fluid passage (700) further includes a fourth operating fluid flow passage (760) and a fifth operating fluid flow passage (770), and an overpressure prevention valve (800) is further included. The description will focus on these differences, and the same description and drawing reference numerals refer to the above-described embodiments.

[0116] Referring to FIGS. 12 to 17, an overpressure prevention hole (619) may be further formed in the safety lock valve body (610). The overpressure prevention hole (619) may be formed in the safety lock valve body (610) so as to be connected to a pressure communication hole (614). A fifth operating fluid flow passage (770) may be connected to the pressure communication hole (614).

[0117] The working fluid passage (700) may further include a fourth working fluid flow passage (760) and a fifth working fluid flow passage (770).

[0118] The fourth working fluid flow passage (760) may provide a passage through which the working fluid flows between the overpressure relief valve (800) and the trip valve (500). The fourth working fluid flow passage (760) may be a flow pipe through which the working fluid flows, and is connected to the overpressure relief valve (800) and the trip valve (500). The fourth working fluid flow passage (760) may be connected to the first working fluid flow passage (720) and may be connected to the trip valve (500).

[0119] The fifth working fluid flow passage (770) may provide a passage through which the working fluid flows between the overpressure relief valve (800) and the safety lock valve (600). The fifth working fluid flow passage (770) may be a flow pipe through which the working fluid flows, and is connected to the overpressure relief valve (800) and the safety lock valve (600). The fifth working fluid flow passage (770) may be connected to the overpressure relief hole (619) of the safety lock valve (600).

[0120] The overpressure relief valve (800) can be opened together with the trip valve (500) so that the working fluid is discharged from the main valve (300) when the pressure inside the reactor (100) becomes higher than the design pressure, which is higher than the normal operating pressure. When the pressure inside the reactor (100) becomes higher than the design pressure, the overpressure relief valve (800) opens to discharge the working fluid from the main valve (300), thereby opening the main valve (300). The overpressure relief valve (800) can be connected to the trip valve (500) and the safety lock valve (600). The overpressure relief valve (800) can be connected to the trip valve (500) and the safety lock valve (600) through the working fluid passage (700). The overpressure relief valve (800) may be connected to the trip valve (500) by being connected to a fourth working fluid flow passage (760) that is connected to a first working fluid flow passage (720) that is connected to the trip valve (500). In addition, the overpressure relief valve (800) may be connected to the safety lock valve (600) by being connected to a fifth working fluid flow passage (770) that is connected to an overpressure prevention hole (619) of the safety lock valve (600).

[0121] The overpressure relief valve (800) may be configured to open when no electricity is applied and close when electricity is applied. For example, the overpressure relief valve (800) may include a valve body having an opening / closing hole formed therein, a plunger movably arranged inside the valve body, an elastic member that applies an elastic force to the plunger in a direction to open the opening / closing hole, and a solenoid that applies a driving force to the plunger in a direction to close the opening / closing hole. In addition, when electricity is not applied to the solenoid, the plunger may move by the elastic force of the elastic member to open the opening / closing hole of the valve body. In addition, when electricity is applied to the solenoid, the plunger may move by overcoming the elastic force of the elastic member to close the opening / closing hole of the valve body. The opening / closing of the overpressure relief valve (800) may be performed by an overpressure relief valve controller connected to the solenoid of the overpressure relief valve (800). The overpressure relief valve controller can be implemented by a computing device including a microprocessor, memory, etc., and the method of implementation is obvious to those skilled in the art, so further detailed description is omitted.

[0122] Referring to FIGS. 14 and 15, when the trip valve (500) is opened unintentionally due to an operator's mistake or the like during normal operation of the reactor (100), even if the safety lock valve (600) is in the second state, the cooling fluid inside the reactor (100) can flow to the overpressure relief valve (800) through the reactor connection pipe (101), the reactor connection passage (740), the pressure communication hole (614), the first pressure space (611-1), the overpressure relief hole (619), and the fifth working fluid flow passage (770). However, since the overpressure relief valve (800) is closed, the cooling fluid inside the reactor (100) may not be discharged into the containment vessel (200). In other words, malfunction can be prevented.

[0123] In addition, if the overpressure relief valve (800) is opened unintentionally due to an operator's mistake or the like during normal operation of the reactor (100), even if the safety lock valve (600) is in the second state, the cooling fluid inside the reactor (100) may flow to the overpressure relief valve (800) through the reactor connection pipe (101), the reactor connection passage (740), the pressure communication hole (614), the first pressure space (611-1), the overpressure relief hole (619), and the fifth working fluid flow passage (770). However, since the trip valve (500) is closed, the cooling fluid inside the reactor (100) may not be discharged into the containment vessel (200). In other words, malfunction can be prevented.

[0124] Referring to FIGS. 16 and 17, the trip valve (500) and the overpressure relief valve (800) may be opened when the reactor (100) is overpressured. In other words, when the pressure inside the reactor (100) is higher than the design pressure, which is higher than the normal operating pressure, the trip valve (500) and the overpressure relief valve (800) may be opened. For example, the trip valve (500) may be opened by not supplying electricity to the trip valve (500) through the trip valve controller, and the overpressure relief valve (800) may be opened by not supplying electricity to the overpressure relief valve (800) through the overpressure relief valve controller.

[0125] When the trip valve (500) and the overpressure relief valve (800) are opened, even if the safety lock valve (600) is in the second state, the cooling fluid inside the reactor (100) can flow to the overpressure relief valve (800) through the reactor connection pipe (101), the reactor connection passage (740), the pressure communication hole (614), the first pressure space (611-1), the overpressure relief hole (619), and the fifth working fluid flow passage (770). The cooling fluid that has flowed to the overpressure relief valve (800) can flow to the trip valve (500) through the fourth working fluid flow passage (760) and the first working fluid flow passage (720). The cooling fluid that has flowed to the trip valve (500) can be discharged into the containment vessel (200) through the third working fluid flow passage (750). In addition, the pressure inside the reactor (100) may become lower than the design pressure. When the pressure inside the reactor (100) becomes lower than the design pressure and thus lower than the normal operating pressure, the safety lock valve (600) may be switched to the first state so that the working fluid may be discharged from the main valve (300). The working fluid discharged from the main valve (300) may flow to the trip valve (500) through the safety lock valve (600), the second working fluid flow passage (730), and the first working fluid flow passage (720) and may be discharged into the containment vessel (200) through the third working fluid flow passage (750). In addition, the main valve (300) may be opened. When the main valve (300) is opened, the cooling fluid inside the containment vessel (200) may be recirculated into the reactor (100) so that emergency core cooling may be achieved.

[0126] Meanwhile, in addition to this configuration, according to the fourth embodiment of the present invention, an overpressure prevention passage (621-2) may be further formed in the euro conversion section (620).

[0127] Hereinafter, a fourth embodiment will be described with reference to FIG. 18. In describing the fourth embodiment of the present invention, compared to the above-described embodiments, there is a difference in that an overpressure prevention passage (621-3) is additionally formed in the euro conversion part (620). This difference will be mainly described, and the same description and drawing reference numerals will be used in the above-described embodiments.

[0128] Referring to Fig. 18, an overpressure prevention passage (621-3) may be further formed in the euro switching section (620). The overpressure prevention passage (621-3) may be connected to the overpressure prevention hole (619) and the second flow communication hole (613) in the second state of the safety locking valve (600). In addition, the overpressure prevention passage (621-3) may not be connected to the overpressure prevention hole (619) and the second flow communication hole (613) in the first state of the safety locking valve (600).

[0129] If the overpressure relief valve (800) is opened unintentionally due to an operator's mistake or the like during normal operation of the reactor (100), even if the safety lock valve (600) is in the second state, the working fluid inside the main valve (300) can flow to the overpressure relief valve (800) through the safety lock valve connection passage (314), the second flow communication hole (613), the overpressure prevention passage (621-3), and the fifth working fluid flow passage (770). However, since the trip valve (500) is closed, the working fluid cannot be discharged into the containment vessel (200). In other words, malfunction can be prevented.

[0130] When the trip valve (500) and the overpressure relief valve (800) are opened when the reactor (100) is overpressured, the working fluid inside the main valve (300) can flow to the overpressure relief valve (800) through the safety lock valve connection passage (314), the second flow communication hole (613), the overpressure relief passage (621-3), and the fifth working fluid flow passage (770). The cooling fluid that has flowed to the overpressure relief valve (800) can flow to the trip valve (500) through the fourth working fluid flow passage (760) and the first working fluid flow passage (720). The working fluid that has flowed to the trip valve (500) can be discharged into the containment vessel (200) through the third working fluid flow passage (750). In addition, the pressure inside the reactor (100) may be lowered below the design pressure. In addition, the main valve (300) may be opened. When the main valve (300) is opened, the cooling fluid inside the reactor (100) may be discharged into the containment vessel (200) through the main valve (300). In addition, the pressure inside the reactor (100) may be lowered below the design pressure and thus lower than the normal operating pressure, and the safety lock valve (600) may be switched to the first state. In addition, the cooling fluid inside the containment vessel (200) may be recirculated into the reactor (100) to achieve emergency core cooling.

[0131] Meanwhile, in addition to this configuration, according to the fifth embodiment of the present invention, the fourth operating fluid flow passage (760) can be directly connected to the trip valve (500).

[0132] Hereinafter, a fifth embodiment will be described with reference to FIG. 19. In describing the fifth embodiment of the present invention, compared to the above-described embodiments, there is a difference in that the fourth operating fluid flow passage (760) is directly connected to the trip valve (500). Therefore, the description will focus on this difference, and the same description and drawing reference numerals will be used in the above-described embodiments.

[0133] Referring to FIG. 19, the fourth operating fluid flow passage (760) may be connected to the first operating fluid flow passage (720) and may be directly connected to the trip valve (500) without being connected to the trip valve (500).

[0134] Meanwhile, in addition to these configurations, according to the sixth embodiment of the present invention, the nuclear power plant (1) may further include a safety lock auxiliary check valve (900).

[0135] Hereinafter, a sixth embodiment will be described with reference to FIG. 20. In describing the sixth embodiment of the present invention, there is a difference from the above-described embodiment in that the nuclear power plant (1) further includes a safety lock auxiliary check valve (900). This difference will be primarily described, and the same descriptions and drawing reference numerals will be used in the above-described embodiments.

[0136] Referring to Fig. 20, the nuclear facility (1) may further include a safety lock auxiliary check valve (900). The safety lock auxiliary check valve (900) may be configured to allow the flow of fluid from the inside of the containment vessel (200) toward the inside of the reactor (100) when the main valve (300) is open, but not allow the flow of fluid from the inside of the reactor (100) toward the inside of the containment vessel (200).

[0137] The main valve (300) may be opened due to an accident in the nuclear reactor (100) or a power outage in the nuclear facility (1). In addition, when the nuclear reactor (100) is depressurized for maintenance, repair, and nuclear fuel reloading of the nuclear reactor (100), the pressure in the nuclear reactor (100) may drop to atmospheric pressure, and the main valve (300) may be opened. In this situation where the main valve (300) is opened, the flow of fluid from the inside of the containment vessel (200) toward the inside of the nuclear reactor (100) may be permitted by the safety lock auxiliary check valve (900), but the flow of fluid from the inside of the nuclear reactor (100) toward the inside of the containment vessel (200) may not be permitted.

[0138] In the event of an accident of a nuclear reactor (100) or a power outage of a nuclear facility (1), the level of the cooling fluid inside the containment vessel (200) may not be higher than the level of the cooling fluid inside the nuclear reactor (100). In addition, the main valve (300) may be opened, so that the cooling fluid inside the nuclear reactor (100) may be discharged into the containment vessel (200) through the main valve (300). However, the safety lock auxiliary check valve (900) can prevent the cooling fluid inside the nuclear reactor (100) from being discharged into the containment vessel (200) through the main valve (300) at the initial stage of an accident of a nuclear reactor (100) or a power outage of a nuclear facility (1).

[0139] Meanwhile, as time passes, the level of the cooling fluid inside the containment vessel (200) may become higher than the level of the cooling fluid inside the reactor (100). When the level of the cooling fluid inside the containment vessel (200) becomes higher than the level of the cooling fluid inside the reactor (100), the safety lock auxiliary check valve (900) may allow recirculation of the cooling fluid from inside the containment vessel (200) into the reactor (100) through the main valve (300). Therefore, emergency core cooling of the reactor (100) may be achieved as the cooling fluid naturally circulates inside the reactor (100) and the containment vessel (200).

[0140] In addition, when the reactor (100) is depressurized for maintenance, repair, and nuclear fuel reloading of the reactor (100), the main valve (300) is opened, and the cooling fluid inside the reactor (100) is prevented from being discharged into the containment vessel (200) through the main valve (300) by the safety lock auxiliary check valve (900).

[0141] Meanwhile, if the trip valve (500) or the overpressure relief valve (800) is opened due to an operator's mistake or the like while the reactor (100) is operating normally, the main valve (300) should not be opened by the safety lock valve (600), but the main valve (300) may be opened due to a malfunction of the safety lock valve (600). In other words, the malfunction prevention by the safety lock valve (600) may not be properly performed. In this case, since the cooling fluid inside the reactor (100) is prevented from being discharged into the containment vessel (200) through the main valve (300) by the safety lock auxiliary check valve (900), the malfunction prevention may be possible.

[0142] The safety lock auxiliary check valve (900) may include a check valve support (910) and a check valve opening / closing member (920).

[0143] The check valve support (910) may be configured so that its interior is in communication with the main valve opening / closing hole (313) of the main valve (300). For example, the check valve support (910) may be connected to the main valve body (310) of the main valve (300) so that its interior is in communication with the main valve opening / closing hole (313). The check valve support (910) may be formed with a check valve opening / closing hole (911) that is in communication with the interior of the containment vessel (200).

[0144] The check valve opening / closing member (920) can be rotatably arranged inside the check valve support (910) so that the check valve opening / closing hole (911) can be opened and closed. The check valve opening / closing member (920) can be rotated by the flow of fluid from the inside of the reactor (100) toward the inside of the containment vessel (200) when the main valve (300) is opened, thereby closing the check valve opening / closing hole (911). In addition, the check valve opening / closing member (920) can be rotated by the flow of fluid from the inside of the containment vessel (200) toward the inside of the reactor (100) when the main valve (300) is opened, thereby opening the check valve opening / closing hole (911).

[0145] Meanwhile, in addition to these configurations, according to the seventh embodiment of the present invention, a containment vessel communication hole (930) may be formed in the safety lock auxiliary check valve (900).

[0146] Hereinafter, a seventh embodiment will be described with reference to FIGS. 21 to 23. In describing the seventh embodiment of the present invention, there is a difference from the above-described embodiment in that a containment vessel communication hole (930) is formed in the safety lock auxiliary check valve (900). This difference will be mainly described, and the same description and drawing reference numerals will be used in the above-described embodiments.

[0147] Referring to FIGS. 21 to 23, a safety lock auxiliary check valve (900) may have a containment vessel communication hole (930) formed therein to allow the flow of fluid from the inside of the reactor (100) toward the inside of the containment vessel (200) when the check valve opening / closing hole (911) is closed by the check valve opening / closing member (920).

[0148] Through this containment vessel communication hole (930), in the event of an accident in which the main valve (300) is incorrectly opened, a small amount of the working fluid of the main valve (300) may be discharged into the containment vessel (200). Even if a small amount of the working fluid of the main valve (300) is discharged into the containment vessel (200) through the containment vessel communication hole (930), if other functions of the reactor (100) operate normally, the operator can know that the main valve (300) has malfunctioned. In addition, by the operator knowing that the main valve (300) has malfunctioned and closing the main valve (300), the operator can deal with an accident in which the main valve (300) is opened, which may be caused by the operator's carelessness, etc.

[0149] The containment vessel communication hole (930) may be formed in the check valve support (910) as illustrated in FIGS. 21 and 22 or in the check valve opening / closing member (920) as illustrated in FIG. 23. The amount of fluid flowing from the inside of the reactor (100) toward the inside of the containment vessel (200) through the containment vessel communication hole (930) may be controlled by changing the diameter of the containment vessel communication hole (930), etc.

[0150] Meanwhile, in addition to this configuration, according to the eighth embodiment of the present invention, a check valve support (910) having a check valve opening / closing hole (911) formed therein is disposed in the reactor connection path (312) or reactor connection pipe (101) of the main valve (300), and a check valve opening / closing member (920) can be rotatably disposed in the reactor connection path (312) or reactor connection pipe (101) to open and close the check valve opening / closing hole (911).

[0151] Referring to FIG. 24, the eighth embodiment will be described. In describing the eighth embodiment of the present invention, compared to the above-described embodiment, there is a difference in that a check valve support (910) having a check valve opening / closing hole (911) formed therein is disposed in the reactor connection path (312) or reactor connection pipe (101) of the main valve (300), and a check valve opening / closing member (920) is rotatably disposed in the reactor connection path (312) or reactor connection pipe (101) to open and close the check valve opening / closing hole (911). The description will focus on these differences, and the same description and drawing reference numerals refer to the above-described embodiments.

[0152] Referring to Fig. 24, a check valve opening / closing hole (911) may be formed in the check valve support (910) of the safety lock auxiliary check valve (900). In addition, the check valve support (910) may be placed in the reactor connection path (312) of the main valve (300) or the reactor connection pipe (101).

[0153] In addition, the check valve opening / closing member (920) may be rotatably arranged in the reactor connection path (312) or the reactor connection pipe (101) to open and close the check valve opening / closing hole (911). The check valve opening / closing member (920) may be rotated by the flow of fluid from the inside of the reactor (100) toward the inside of the containment vessel (200) when the main valve (300) is opened, thereby closing the check valve opening / closing hole (911). In addition, the check valve opening / closing member (920) may be rotated by the flow of fluid from the inside of the containment vessel (200) toward the inside of the reactor (100) when the main valve (300) is opened, thereby opening the check valve opening / closing hole (911).

[0154] Meanwhile, in addition to these configurations, according to the ninth embodiment of the present invention, a check valve flow path (912) is formed in a check valve support (910) of a safety lock auxiliary check valve (900), a check valve opening / closing member (920) opens / closes the check valve flow path (912), and the safety lock auxiliary check valve (900) may include a check valve elastic member (940) that elastically supports the check valve opening / closing member (920) in a direction that closes the check valve flow path (912).

[0155] Hereinafter, a ninth embodiment will be described with reference to FIGS. 25 and 26. In describing the ninth embodiment of the present invention, compared to the above-described embodiment, there is a difference in that a check valve flow path (912) is formed in a check valve support (910) of a safety lock auxiliary check valve (900), a check valve opening / closing member (920) opens and closes the check valve flow path (912), and the safety lock auxiliary check valve (900) includes a check valve elastic member (940) that elastically supports the check valve opening / closing member (920) in a direction that closes the check valve flow path (912). The description will focus on these differences, and the same description and drawing reference numerals refer to the above-described embodiments.

[0156] In other words, in the case of the 6th to 8th embodiments described above, the check valve opening / closing member (920) rotates due to the dynamic pressure of the working fluid to open / close the safety locking auxiliary check valve (900), whereas in the case of the 9th embodiment, the check valve opening / closing member (920) moves due to the elastic force of the check valve elastic member (940) and the dynamic pressure of the working fluid to open / close the safety locking auxiliary check valve (900), which is different.

[0157] Referring to FIGS. 25 and 26, a check valve flow path (912) may be formed in a check valve support (910) of a safety lock auxiliary check valve (900). The check valve flow path (912) may be connected to a main valve opening / closing hole (313) of a main valve (300) and may be communicated with the inside of a containment vessel (200). For example, one side of the check valve support (910) may be connected to a main valve body (310) of a main valve (300), so that one side of the check valve flow path (912) may be connected to the main valve opening / closing hole (313) and the other side may be communicated with the inside of the containment vessel (200). In addition, the check valve flow path (912) may be connected to the inside of a reactor (100) and a reactor connection path (312) of the main valve (300). For example, one side of the check valve support (910) may be connected to the reactor (100) and the other side may be connected to the main valve body (310) of the main valve (300), so that one side of the check valve flow path (912) may be connected to the inside of the reactor (100) and the other side may be connected to the reactor connection path (312).

[0158] The check valve opening / closing member (920) can be movably arranged on the check valve support (910) to open / close the check valve flow path (912).

[0159] Additionally, the check valve elastic member (940) can elastically support the check valve opening / closing member (920) in the direction of closing the check valve flow path (912).

[0160] Referring to FIGS. 25 and 26, the safety lock auxiliary check valve (900) may be arranged to allow the flow of fluid from the inside of the containment vessel (200) toward the inside of the reactor (100) when the main valve (300) is opened, but not to allow the flow of fluid from the inside of the reactor (100) toward the inside of the containment vessel (200). The check valve opening / closing member (920) may move in the direction of closing the check valve flow path (912) by the elastic force of the check valve elastic member (940). In addition, when the flow of fluid occurs from the inside of the reactor (100) toward the inside of the containment vessel (200), the check valve opening / closing member (920) may receive a force in the direction of closing the check valve flow path (912) by the dynamic pressure of an additional working fluid.

[0161] Meanwhile, in the event of an accident in the reactor (100), when the level of the cooling fluid inside the containment vessel (200) becomes higher than the level of the cooling fluid inside the reactor (100), and the hydrostatic pressure due to the water pressure difference becomes greater than the elastic force of the check valve elastic member (940), the check valve opening / closing member (920) can move in the direction of opening the check valve flow path (912). When the check valve flow path (912) is opened by the check valve opening / closing member (920), the cooling fluid can flow from the inside of the containment vessel (200) to the inside of the reactor (100). In addition, the cooling fluid can circulate between the inside of the containment vessel (200) and the inside of the reactor (100) in the direction of the inside of the reactor (100) from the inside of the containment vessel (200).

[0162] Meanwhile, referring to FIG. 26, a containment vessel communication hole (930) communicating with the inside of the containment vessel may be formed in the check valve opening / closing member (920). The containment vessel communication hole (930) may allow the flow of fluid from the inside of the reactor (100) toward the inside of the containment vessel (200) when the check valve flow path (912) is closed by the check valve opening / closing member (920). The amount of fluid flowing from the inside of the reactor (100) toward the inside of the containment vessel (200) through the containment vessel communication hole (930) may be controlled by changing the diameter of the containment vessel communication hole (930), etc.

[0163] Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, but should be construed to have the broadest scope in accordance with the technical concepts disclosed in this specification. Those skilled in the art may combine / substitute the disclosed embodiments to implement patterns of shapes not specified, but this also does not depart from the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is clear that such modifications or alterations also fall within the scope of the present invention.

Claims

1. A safety lock valve body having a first flow communication hole, a second flow communication hole, and a pressure communication hole formed therein; A flow path switching part movably arranged inside the safety lock valve body so that a switching flow path is formed and moves between a first state in which the switching flow path is connected to the first flow communication hole and the second flow communication hole and a second state in which the switching flow path is blocked from being connected to the first flow communication hole and the second flow communication hole; and The above-mentioned euro conversion part includes an elastic member for providing elastic force to the euro conversion part in the direction in which the euro conversion part moves to the first state, The above pressure communication hole is formed so that the fluid pressurizing the euro switching unit flows into the inside of the safety lock valve body in the direction in which the euro switching unit moves to the second state. Safety lock valve.

2. In paragraph 1, A space for moving the euro switching part is formed inside the body of the safety lock valve, in which the euro switching part is movably arranged. The above Euro conversion section movement space includes a first pressure space connected to the pressure communication hole and a second pressure space connected to the outside of the safety lock valve body. Safety lock valve.

3. In paragraph 2, The safety lock valve body further has an external communication hole formed to connect the outside of the safety lock valve body and the second pressure space so that fluid can flow in and out of the second pressure space when the volume of the second pressure space changes. Safety lock valve.

4. In paragraph 3, Further comprising a euro conversion bellows that is arranged in the euro conversion moving space so as to be connected to the safety lock valve body and the euro conversion part and blocks communication between the first pressure space and the second pressure space. Safety lock valve.

5. In paragraph 4, The above Euro conversion part is, A euro conversion member in which the above conversion euro is formed; and Including the above Euro conversion member and the moving driving member to which the Euro conversion bellows is connected, Safety lock valve.

6. In paragraph 5, The above Euro conversion elastic member Placed between the safety lock valve body on the external communication hole side and the moving driving member, Safety lock valve.

7. In paragraph 6, The above Euro conversion bellows is connected to the safety lock valve body on the side of the external communication hole so that the inside is connected to the external communication hole, The above-mentioned Euro conversion elastic member is placed inside the above-mentioned Euro conversion bellows, The above first pressure space includes the movement space of the euro conversion part outside the euro conversion bellows, The above second pressure space includes the movement space of the euro conversion part inside the euro conversion bellows. Safety lock valve.

8. In paragraph 7, The safety lock valve body further has a body pressure equalization passage formed to connect the first pressure space on one side of the euro switching section and the first pressure space on the other side of the euro switching section. Safety lock valve.

9. In paragraph 6, The above Euro conversion bellows is connected to the safety lock valve body between the moving drive member and the Euro conversion member and the moving drive member, The above first pressure space includes the inside of the euro conversion bellows and the euro conversion part movement space that is connected to the pressure communication hole, The second pressure space includes the Euro conversion part movement space that is connected to the outside of the Euro conversion bellows and the external communication hole. Safety lock valve.

10. In paragraph 9, In the above-mentioned euro conversion member, a first member pressure equalization passage is formed to connect the first pressure space on one side of the euro conversion member and the first pressure space on the other side of the euro conversion member. In the above moving driving member, a second member pressure equalization passage is formed to connect the second pressure space on one side of the moving driving member and the second pressure space on the other side of the moving driving member. Safety lock valve.

11. In paragraph 3, The above safety lock valve body further has an overpressure prevention hole formed therein. Safety lock valve.

12. In paragraph 11, The above overpressure prevention hole is formed in the safety lock valve body so as to be connected to the pressure communication hole. Safety lock valve.

13. In paragraph 11, In the above Euro conversion part, In the second state, an overpressure prevention passage is further formed that is connected to the overpressure prevention hole and the second flow communication hole. Safety lock valve.

14. Nuclear reactor; A containment vessel in which the above reactor is placed; A main valve disposed inside the containment vessel so as to be connected to the inside of the reactor, and opened and closed so as to allow the inside of the reactor and the inside of the containment vessel to communicate or not communicate, and configured to close when the working fluid is supplied and open when the working fluid is discharged; A reset valve that opens to supply the above working fluid to the above main valve; A trip valve that opens to allow the operating fluid to be discharged from the main valve; A safety lock valve configured to allow the working fluid to flow to the main valve when the reset valve is opened and to allow the working fluid to be discharged from the main valve when the trip valve is opened, and to prevent the main valve from opening when the trip valve is opened during normal operation of the reactor; and It includes an operating fluid passage connected between two or more of the main valve, the reset valve, the trip valve, and the safety lock valve so that the operating fluid flows, The safety lock valve is configured to switch between a first state that allows the operating fluid to flow into the main valve or to discharge the operating fluid from the main valve and a second state that does not allow the operating fluid to flow into the main valve. Nuclear power plants.

15. In paragraph 14, The above safety lock valve, A safety lock valve body having a first flow communication hole connected to the reset valve and the trip valve, a second flow communication hole connected to the main valve, and a pressure communication hole connected to the inside of the reactor; A flow path switching part arranged inside the safety lock valve body so that a flow path is formed and moves between the first state in which the flow path is connected to the first flow communication hole and the second flow communication hole and the second state in which the flow path is blocked from being connected to the first flow communication hole and the second flow communication hole; The above-mentioned euro conversion part includes an elastic member for providing elastic force to the euro conversion part in the direction in which the euro conversion part moves to the first state, The above-mentioned euro-switching part is configured so that a force due to the difference between the pressure inside the reactor and the pressure inside the containment vessel is provided to the euro-switching part in the direction in which the euro-switching part moves to the second state. Nuclear power plants.

16. In paragraph 14, When the pressure inside the reactor becomes higher than the design pressure, which is higher than the normal operating pressure during normal operation of the reactor, an overpressure relief valve that opens together with the trip valve so that the working fluid is discharged from the main valve is further included. Nuclear power plants.

17. In paragraph 14, Further comprising a safety lock auxiliary check valve configured to allow the flow of fluid from inside the containment vessel toward the inside of the reactor when the main valve is opened, but not allow the flow of fluid from inside the reactor toward the inside of the containment vessel. Nuclear power plants.

18. In paragraph 17, The above safety lock auxiliary check valve is connected to the main valve, or is connected to the inside of the reactor and the main valve, or is arranged on the main valve so as to be connected to the inside of the reactor, or is arranged on the reactor connection pipe connecting the inside of the reactor and the main valve. Nuclear power plants.

19. In paragraph 17, The above main valve, A main valve body having a reactor connection path connected to the inside of the reactor, a main valve opening / closing hole connected to the reactor connection path and communicating with the inside of the containment vessel, and connected to the safety lock valve; and Including a main valve plunger movably arranged on the main valve body to open and close the main valve opening hole. Nuclear power plants.

20. In paragraph 19, The above safety lock auxiliary check valve is, A check valve support configured to be internally connected to the main valve opening and closing hole and having a check valve opening and closing hole formed therein that is connected to the inside of the containment vessel; and Including a check valve opening / closing member rotatably arranged inside the check valve support to open / close the check valve opening / closing hole. Nuclear power plants.

21. In paragraph 20, In the above safety lock auxiliary check valve, a containment vessel communication hole is formed that communicates with the inside of the containment vessel to allow the flow of fluid from inside the reactor toward the inside of the containment vessel when the check valve opening / closing hole is closed by the check valve opening / closing member. Nuclear power plants.

22. In paragraph 19, The above safety lock auxiliary check valve is, A check valve support formed with a check valve opening hole and arranged in the reactor connection path or the reactor connection pipe connecting the inside of the reactor and the reactor connection path; and Including a check valve opening / closing member rotatably arranged in the reactor connection path or the reactor connection pipe to open / close the check valve opening / closing hole. Nuclear power plants.

23. In paragraph 19, The above safety lock auxiliary check valve is, A check valve support formed with a check valve flow path connected to the main valve opening hole and communicating with the inside of the containment vessel or connected to the inside of the reactor and the reactor connection path; A check valve opening / closing member movably arranged on the check valve support to open / close the check valve flow path; and Including a check valve elastic member that elastically supports the check valve opening / closing member in a direction that closes the check valve flow path. Nuclear power plants.

24. In paragraph 23, In the above check valve opening / closing member, a containment vessel communication hole is formed to communicate with the inside of the containment vessel so as to allow the flow of fluid from inside the reactor toward the inside of the containment vessel when the check valve flow path is closed by the check valve opening / closing member. Nuclear power plants.

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