Malfunction prevention valve and nuclear equipment comprising same

Abstract

This malfunction prevention valve comprises: a malfunction prevention valve body having a malfunction prevention flow path; a malfunction prevention plunger movably disposed in the malfunction prevention valve body so as to open and close the malfunction prevention flow path; a plunger movement driving plate movably disposed in the malfunction prevention valve body such that one side thereof is connected to the malfunction prevention plunger; and a malfunction prevention elastic member for providing an elastic force to the plunger movement driving plate in the direction in which the malfunction prevention plunger opens the malfunction prevention flow path, wherein the force generated by the difference between the pressure of one side of the malfunction prevention flow path and external pressure is provided to the plunger movement driving plate in the direction in which the malfunction prevention plunger closes the malfunction prevention flow path.

Description

Malfunction prevention valves and nuclear power plants containing the same

[0001] The present invention relates to a malfunction prevention valve and a nuclear power plant including the same.

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

[0003] In emergency core cooling using natural circulation using valves, the main valve is opened and closed by the working fluid. When the reset valve opens, the working fluid is supplied to the main valve, closing it. Furthermore, when the trip valve opens, the working fluid is discharged from the main valve, opening it.

[0004] Meanwhile, the malfunction prevention valve connected to the main valve can prevent the main valve from opening even if the operator accidentally operates the trip valve during normal operation of the reactor.

[0005] Embodiments of the present invention have been invented against the background described above, and are intended to provide a malfunction prevention valve having a relatively simple configuration and high reliability in preventing malfunctions, and a nuclear power plant including the same, which prevents malfunctions in which a main valve for emergency core cooling opens during normal operation of a nuclear reactor.

[0006] According to one aspect of the present invention, a malfunction prevention valve comprises: a malfunction prevention valve body having a malfunction prevention flow path formed therein; a malfunction prevention plunger movably arranged on the malfunction prevention valve body to open and close the malfunction prevention flow path; a plunger moving drive plate movably arranged on the malfunction prevention valve body so as to have one side connected to the malfunction prevention plunger; and a malfunction prevention elastic member providing elastic force to the plunger moving drive plate in a direction in which the malfunction prevention plunger opens the malfunction prevention flow path, and a force due to a difference between a pressure on one side of the malfunction prevention flow path and an external pressure is configured to be provided to the plunger moving drive plate in a direction in which the malfunction prevention plunger closes the malfunction prevention flow path.

[0007] In addition, the nuclear facility comprises: a nuclear reactor; a containment vessel in which the nuclear reactor is placed; 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 that the interior of the nuclear reactor and the interior of the containment vessel are selectively communicated, and configured to close when a working fluid is supplied and open when the working fluid is discharged; a reset valve that opens so that the working fluid is supplied to the main valve; a trip valve that opens so that the working fluid is discharged from the main valve; a malfunction prevention 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 that the main valve is not opened when the trip valve is opened during normal operation of the nuclear reactor; And it includes an operating fluid passage section that provides a passage for operating fluid to flow between two or more of the main valve, the reset valve, the trip valve, and the malfunction prevention valve, and the malfunction prevention valve can be configured to open and close according to the difference between the pressure of the reactor and the pressure inside the containment vessel.

[0008] According to embodiments of the present invention, the malfunction prevention valve for preventing the main valve for emergency core cooling from malfunctioning by opening during normal operation of the reactor has the effect of being simple and highly reliable.

[0009] FIG. 1 is a drawing showing a nuclear power plant according to a first embodiment of the present invention.

[0010] Figure 2 is a drawing showing a malfunction prevention valve of the nuclear power plant of Figure 1.

[0011] Figures 3 and 4 are drawings showing the operation of the nuclear power plant and malfunction prevention valve of Figure 1 during initial operation of the reactor.

[0012] Figures 5 and 6 are drawings showing the normal operation of the nuclear power plant and the malfunction prevention valve of Figure 1.

[0013] Figures 7 and 8 are drawings showing the operation of the nuclear power plant and the malfunction prevention valve of Figure 1 when the trip valve is unintentionally opened during normal operation of the reactor.

[0014] Figures 9 and 10 are drawings showing the operation of the nuclear power plant and malfunction prevention valve of Figure 1 in the event of an accident in the reactor.

[0015] FIGS. 11 to 14 are drawings showing the configuration and operation of a malfunction prevention valve of a nuclear power plant according to a second embodiment of the present invention. FIG. 11 shows the initial operation of a nuclear reactor, FIG. 12 shows the normal operation of a nuclear reactor, FIG. 13 shows the case when a trip valve is opened unintentionally during the normal operation of a nuclear reactor, and FIG. 14 shows the case when an accident occurs in a nuclear reactor.

[0016] FIGS. 15 to 18 are drawings showing the configuration and operation of a malfunction prevention valve of a nuclear power plant according to a third embodiment of the present invention. FIG. 15 shows the initial operation of a nuclear reactor, FIG. 16 shows the normal operation of a nuclear reactor, FIG. 17 shows the case when a trip valve is opened unintentionally during the normal operation of a nuclear reactor, and FIG. 18 shows the case when an accident occurs in a nuclear reactor.

[0017] FIGS. 19 to 22 are drawings showing the configuration and operation of a malfunction prevention valve of a nuclear power plant according to a fourth embodiment of the present invention. FIG. 19 shows the initial operation of a nuclear reactor, FIG. 20 shows the normal operation of a nuclear reactor, FIG. 21 shows the case when a trip valve is opened unintentionally during the normal operation of a nuclear reactor, and FIG. 22 shows the case when an accident occurs in a nuclear reactor.

[0018] FIGS. 23 to 26 are drawings showing the configuration and operation of a malfunction prevention valve of a nuclear power plant according to a fifth embodiment of the present invention. FIG. 23 shows the initial operation of a nuclear reactor, FIG. 24 shows the normal operation of a nuclear reactor, FIG. 25 shows the case when a trip valve is opened unintentionally during the normal operation of a nuclear reactor, and FIG. 26 shows the case when an accident occurs in a nuclear reactor.

[0019] Figure 27 shows the configuration of a malfunction prevention valve of a nuclear power plant during initial operation of a nuclear reactor according to the sixth embodiment of the present invention.

[0020] Figure 28 shows the configuration of a malfunction prevention valve of a nuclear power plant during initial operation of a nuclear reactor according to the seventh embodiment of the present invention.

[0021] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Additionally, the expressions "top," "bottom," "upper surface," "lower surface," "side surface," "upper and lower surface," etc. in this specification are based on 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.

[0026] 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.

[0027] 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.

[0028] Hereinafter, with reference to FIGS. 1 and 2, a description will be given of a specific configuration of a malfunction prevention valve according to a first embodiment of the present invention and a nuclear power plant including the same. In a nuclear power plant (1) according to the first embodiment of the present invention, in the event of an accident in a 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 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) according to a first embodiment of the present invention may include a nuclear reactor (100), a containment vessel (200), a main valve (300), a reset valve (400), a trip valve (500), a malfunction prevention valve (600), and a working fluid passage (700).

[0029] In a nuclear reactor (100), nuclear fission can occur using nuclear fuel containing radioactive materials such as uranium. Furthermore, the reactor (100) can use the heat generated by nuclear fission to evaporate water and generate steam. The steam can be supplied to a steam turbine outside the reactor (100) or to a desalination plant or other steam-using facility. A connecting pipe (101) may be provided in the reactor (100) to be connected to a main valve (300).

[0030] The containment vessel (200) can be manufactured as a steel containment vessel and can prevent nuclear fission products, such as radiation generated by nuclear fission in the reactor (100), from leaking 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).

[0031] The main valve (300) can be opened and closed to selectively allow communication between the inside of the reactor (100) and the inside of the containment vessel (200). The main valve (300) can be placed on the side or top of the reactor (100). When the reactor (100) is operating normally, the main valve (300) may be closed, so that the inside of the reactor (100) and the inside of the containment vessel (200) may not be connected. In the event of an accident in the reactor (100), the main valve (300) placed on the top of the reactor (100) may be opened, so that the coolant that has become vapor inside the reactor (100) may be discharged from the reactor (100). A cooling fluid is discharged from a reactor (100) into a containment vessel (200) in a vapor state, and the cooling fluid discharged into the containment vessel (200) can be condensed into a liquid state by the inner wall of the containment vessel (200) or a passive emergency cooling device (not shown). The cooling fluid filled inside the containment vessel (200) can be introduced into the reactor (100) through a main valve (300) arranged on the side of the reactor (100). In other words, when the main valve (300) arranged on the side 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.

[0032] 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).

[0033] The main valve body (310) can be connected to the interior of the reactor (100) and to the malfunction prevention valve (600). The main valve body (310) can be connected to the interior of the reactor (100) by a connecting pipe (101). In addition, the main valve body (310) can be connected to the malfunction prevention valve (600) via a third working fluid flow passage (740) included in the working fluid passage (700), which will be described later. The main valve body (310) can be connected to a malfunction prevention valve body (610) included in the malfunction prevention valve (600), which will be described later, via the third working fluid flow passage (740). The main valve body (310) can also be directly connected to the malfunction prevention valve body (610). A main valve plunger movement space (311), a reactor connection path (312), a main valve opening / closing hole (313), and a flow passage connection path (314) can be formed in the main valve body (310).

[0034] A main valve plunger (320) may be movably arranged in the main valve plunger movement space (311). A reactor connection path (312) may be connected to the inside of the reactor (100) and the main valve plunger movement space (311). The reactor connection path (312) may be connected to the inside of the reactor (100) through a connection pipe (101). A 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 / closing hole (313) may be opened / closed by the main valve plunger (320). A flow passage connection path (314) may be connected to the main valve plunger movement space (311). In addition, the flow passage connecting passage (314) may be connected to a malfunction prevention valve (600). The flow passage connecting passage (314) may be connected to a malfunction prevention passage (611) formed in the malfunction prevention valve body (610) via a third operating fluid flow passage (740), which will be described later. The flow passage connecting passage (314) may also be directly connected to the malfunction prevention passage (611).

[0035] The main valve plunger (320) may be movably arranged on the main valve body (310) to open and close the main valve opening and closing hole (313). The main valve plunger (320) may be movably arranged on the main valve plunger moving space (311) of the main valve body (310). Depending on the moving position of the main valve plunger (320) in the main valve plunger moving space (311), the main valve opening and closing hole (313) may be opened and closed by one side of the main valve plunger (320). For example, the lower portion of the main valve plunger (320) may open and close the main valve opening and closing hole (313). A main valve plunger communication passage (321) may be formed in the main valve plunger (320). The reactor connection passage (312) and the flow passage connection passage (314) can be connected through the main valve plunger communication passage (321). In addition, the pressure of the reactor (100) can be transmitted to the flow passage connection passage (314) through the reactor connection passage (312), the main valve plunger communication passage (321), and the main valve plunger movement space (311). In other words, the pressure of the flow passage connection passage (314) can be equal to the pressure of the reactor (100).

[0036] The main valve elastic member (330) can elastically support the main valve plunger (320). The main valve elastic member (330) can provide 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).

[0037] 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. The reset valve (400) may be connected to the main valve (300) via a second working fluid flow passage (730) connected to the first working fluid flow passage (720), a malfunction prevention valve (600) connected to the second working fluid flow passage (730), and a third working fluid flow passage (740) connected to the malfunction prevention valve (600) and the main valve (300). 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 the containment vessel (200). However, the working fluid supply source (2) is not particularly limited.

[0038] 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.

[0039] 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 the trip valve (500) being opened to discharge 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 main valve (300) through a second working fluid flow passage (730) connected to the first working fluid flow passage (720), a malfunction prevention valve (600) connected to the second working fluid flow passage (730), and a third working fluid flow passage (740) connected to the malfunction prevention valve (600) and the main valve (300). Additionally, the trip valve (500) can be connected to the inside of the containment vessel (200) by a fourth operating fluid flow passage (750) included in the operating fluid passage (700), which will be described later.

[0040] 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.

[0041] The malfunction prevention valve (600) can allow the working fluid to flow to the main valve (300) when the reset valve (400) is opened and can allow the working fluid to be discharged from the main valve (300) when the trip valve (500) is opened. In addition, the malfunction prevention valve (600) can prevent the main valve (300) from opening when the trip valve (500) is opened unintentionally during normal operation of the reactor (100). The malfunction prevention valve (600) can be connected to the main valve (300), the reset valve (400), and the trip valve (500) through the working fluid passage (700). The malfunction prevention valve (600) can be configured to open and close depending on the difference between the pressure of the reactor (100) and the pressure inside the containment vessel (200). The malfunction prevention valve (600) can be opened when the difference between the pressure of the reactor (100) and the pressure inside the containment vessel (200) is lower than a predetermined pressure difference. In addition, the malfunction prevention valve (600) can be closed when the difference between the pressure of the reactor (100) and the pressure inside the containment vessel (200) is greater than a predetermined pressure difference. The predetermined pressure difference may be smaller than the pressure difference between the pressure of the reactor (100) and the pressure inside the containment vessel (200) during normal operation of the reactor (100), and larger than the pressure difference between the pressure of the working fluid provided to the main valve plunger (320) through the reset valve (400) to close the main valve (300) and the pressure inside the containment vessel (200). The malfunction prevention valve (600) may include a malfunction prevention valve body (610), a malfunction prevention plunger (620), a plunger moving drive plate (630), a malfunction prevention elastic member (640), a malfunction prevention bellows (650), a malfunction prevention communication passage (660), and a communication prevention bellows (670).The malfunction prevention valve (600) can be configured so that a force due to the difference in pressure between one side of a malfunction prevention passage (611) formed in the malfunction prevention valve body (610) and the pressure outside the malfunction prevention valve (600), that is, inside the containment vessel (200), is provided to the plunger moving drive plate (630) in the direction in which the malfunction prevention plunger (620) closes the malfunction prevention passage (611).

[0042] A malfunction prevention valve body (610) may be disposed inside a containment vessel (200). The malfunction prevention valve body (610) may surround one or more of a malfunction prevention plunger (620), a plunger moving drive plate (630), a malfunction prevention elastic member (640), a malfunction prevention bellows (650), and a communication prevention bellows (670). The malfunction prevention valve body (610) may be connected to the main valve (300) through a third working fluid flow passage (740) and may be connected to a reset valve (400) and a trip valve (500) through a second working fluid flow passage (730) and a first working fluid flow passage (720). The malfunction prevention valve body (610) may be connected to the main valve (300) by being connected to a third operating fluid flow passage (740) connected to the main valve (300). In addition, the malfunction prevention valve body (610) may be connected to a second operating fluid flow passage (730) connected to the reset valve (400) and the trip valve (500) through a first operating fluid flow passage (720), thereby being connected to the reset valve (400) and the trip valve (500). The malfunction prevention valve body (610) may also be directly connected to the main valve (300). The malfunction prevention valve body (610) may be formed with a malfunction prevention passage (611), a malfunction prevention space (612), an external communication hole (613), and a plunger passage hole (614).

[0043] The malfunction prevention passage (611) can allow the operating fluid to flow in one direction or the other. The malfunction prevention passage (611) can be opened and closed by the malfunction prevention plunger (620). When the malfunction prevention passage (611) is opened by the malfunction prevention plunger (620), the operating fluid can flow in the malfunction prevention passage (611) in one direction or the other. One side of the malfunction prevention passage (611) can be connected to the main valve (300), and the other side of the malfunction prevention passage (611) can be connected to the reset valve (400) and the trip valve (500). One side of the malfunction prevention passage (611) can be connected to the third operating fluid flow passage (740) that is connected to the main valve (300), and thus connected to the main valve (300). In addition, the other side of the malfunction prevention passage (611) may be connected to a second operating fluid flow passage (730) that is connected to the reset valve (400) and the trip valve (500) through the first operating fluid flow passage (720), and may be connected to the reset valve (400) and the trip valve (500). One side of the malfunction prevention passage (611) may be connected to the flow passage connection passage (314) of the main valve (300) through the third operating fluid flow passage (740). The malfunction prevention passage (611) may be formed integrally with the third operating fluid flow passage (740) and the second operating fluid flow passage (730). In addition, one side of the malfunction prevention passage (611) may be directly connected to the flow passage connection passage (314). The malfunction prevention path (611) may include a first connection path (611-1), a second connection path (611-2), and a malfunction prevention opening / closing space (611-3).

[0044] The first connecting passage (611-1) may be connected to the main valve (300). The first connecting passage (611-1) may be connected to a third working fluid flow passage (740) connected to the main valve (300) and may be connected to the main valve (300). The first connecting passage (611-1) may be connected to a flow passage connecting passage (314) of the main valve (300). The first connecting passage (611-1) may be connected to a third working fluid flow passage (740) connected to the flow passage connecting passage (314) and may be connected to the flow passage connecting passage (314). The first connecting passage (611-1) may be formed integrally with the third working fluid flow passage (740). In addition, the first connecting passage (611-1) may be directly connected to the flow passage connecting passage (314). The pressure of the reactor (100) can be transmitted to the first connecting passage (611-1) through the flow passage connecting passage (314). In other words, the pressure of the first connecting passage (611-1) can be equal to the pressure of the reactor (100). The first connecting passage (611-1) can be connected to a first pressure space (612-1) to be described later, which is included in the malfunction prevention space (612). In addition, the pressure of the first connecting passage (611-1) can be transmitted to the first pressure space (612-1). In other words, the pressure of the first pressure space (612-1) can be equal to the pressure of the first connecting passage (611-1) and can be equal to the pressure of the reactor (100). The first connecting passage (611-1) can be connected to the first pressure space (612-1) through a malfunction prevention communication passage (660).

[0045] The second connecting passage (611-2) can be connected to the reset valve (400) and the trip valve (500). The second connecting passage (611-2) can be connected to the second operating fluid flow passage (730) which is connected to the reset valve (400) and the trip valve (500) through the first operating fluid flow passage (720), thereby being connected to the reset valve (400) and the trip valve (500). The second connecting passage (611-2) can also be formed integrally with the second operating fluid flow passage (730).

[0046] The malfunction prevention opening / closing space (611-3) can be connected to the first connection path (611-1) and the second connection path (611-2). A portion of the malfunction prevention plunger (620) can be movably arranged in the malfunction prevention opening / closing space (611-3). The malfunction prevention opening / closing space (611-3) can include a first opening / closing space (611-31), a second opening / closing space (611-32), and a malfunction prevention opening / closing hole (611-33).

[0047] The first opening / closing space (611-31) can be connected to the first connecting passage (611-1). In addition, the second opening / closing space (611-32) can be connected to the second connecting passage (611-2). The second opening / closing space (611-32) can be positioned above the first opening / closing space (611-31) and connected to the second connecting passage (611-2). The second opening / closing space (611-32) can be connected to the plunger passage hole (614). In addition, a malfunction prevention plunger (620) can be passed through the second opening / closing space (611-32).

[0048] The malfunction prevention opening (611-33) can be connected to the first opening space (611-31) and the second opening space (611-32). The first opening space (611-31) can be arranged below the malfunction prevention opening (611-33), and the second opening space (611-32) can be arranged above the malfunction prevention opening (611-33). The malfunction prevention opening (611-33) can be opened and closed by the malfunction prevention plunger (620).

[0049] In the malfunction prevention space (612), at least a portion of the plunger moving drive plate (630) and the malfunction prevention plunger (620) can be movably arranged. The malfunction prevention space (612) can include a first pressure space (612-1) and a second pressure space (612-2). The first pressure space (612-1) and the second pressure space (612-2) of the malfunction prevention space (612) can be blocked from communication with each other by a malfunction prevention bellows (650). The first pressure space (612-1) can be a malfunction prevention space (612) outside the malfunction prevention bellows (650), and the second pressure space (612-2) can be a malfunction prevention space (612) inside the malfunction prevention bellows (650).

[0050] The first pressure space (612-1) may be connected to one side of the malfunction prevention passage (611). The first pressure space (612-1) may be connected to one side of the malfunction prevention passage (611) by a malfunction prevention communication passage (660). The first pressure space (612-1) may be connected to the first connection passage (611-1) of the malfunction prevention passage (611). The first pressure space (612-1) may be connected to the first connection passage (611-1) by the malfunction prevention communication passage (660). In addition, the pressure of the first connection passage (611-1) may be transmitted to the first pressure space (612-1) through the malfunction prevention communication passage (660). In other words, the pressure of the first pressure space (612-1) can be equal to the pressure of the first connecting passage (611-1) and the pressure of the reactor (100). A communication-prevention bellows (670) can be arranged in the first pressure space (612-1). In addition, a malfunction-prevention plunger (620) can be arranged in the first pressure space (612-1) so as to be movably connected to one surface of a plunger moving drive plate (630) by passing through the communication-prevention bellows (670).

[0051] The second pressure space (612-2) may be communicated with the outside of the malfunction prevention valve (600). The pressure of the second pressure space (612-2) may be equal to the pressure outside the malfunction prevention valve (600). In other words, the second pressure space (612-2) may be communicated with the inside of the containment vessel (200) in which the malfunction prevention valve (600) is disposed. In addition, the second pressure space (612-2) may be equal to the pressure inside the containment vessel (200) in which the malfunction prevention valve (600) is disposed. The second pressure space (612-2) may be communicated with the inside of the containment vessel (200) in which the malfunction prevention valve (600) is disposed, through an external communication hole (613). A malfunction prevention elastic member (640) may be disposed in the second pressure space (612-2). In other words, a malfunction-preventing elastic member (640) can be placed inside the malfunction-preventing bellows (650).

[0052] The external communication hole (613) can communicate the outside of the malfunction prevention valve (600) with the second pressure space (612-2). In other words, the external communication hole (613) can communicate the inside of the containment vessel (200), which is outside the malfunction prevention valve (600), with the second pressure space (612-2). Through the external communication hole (613), a fluid such as water or air can flow into and out of the second pressure space (612-2) when the volume of the second pressure space (612-2) changes. In addition, the pressure outside the malfunction prevention valve (600) and the pressure of the second pressure space (612-2) can be made equal by the external communication hole (613). In other words, the pressure of the second pressure space (612-2) can be made equal to the pressure inside the containment vessel (200) by the external communication hole (613).

[0053] The plunger passage hole (614) allows the malfunction prevention plunger (620) to movably pass through. The plunger passage hole (614) can be connected to the malfunction prevention space (612) and the malfunction prevention opening / closing space (611-3). The plunger passage hole (614) can be connected to the first pressure space (612-1) and the second opening / closing space (611-32). In addition, the malfunction prevention plunger (620) that is connected to one surface of the plunger movement driving plate (630) and passes through the communication prevention bellows (670) can movably pass through the plunger passage hole (614). In addition, the malfunction prevention plunger (620) that passes through the plunger passage hole (614) can pass through the second opening / closing space (611-32).

[0054] The malfunction prevention plunger (620) can be movably arranged on the malfunction prevention valve body (610) to open and close the malfunction prevention passage (611). The malfunction prevention plunger (620) can be connected to one side of the plunger moving driving plate (630). The malfunction prevention plunger (620) can extend from the plunger moving driving plate (630) and pass through the communication prevention bellows (670), the plunger passage hole (614), the second opening / closing space (611-32), and the malfunction prevention opening / closing hole (611-33) to open and close the malfunction prevention opening / closing hole (611-33). In other words, the part of the malfunction prevention plunger (620) arranged in the first opening / closing space (611-31) can open and close the malfunction prevention opening / closing hole (611-33). For example, the malfunction prevention plunger (620) may have an upper portion connected to the lower surface of the plunger moving drive plate (630) and may extend downward from the lower surface of the plunger moving drive plate (630) to pass through the communication prevention bellows (670), the plunger passage hole (614), the second opening / closing space (611-32), and the malfunction prevention opening / closing hole (611-33). In addition, the lower portion of the malfunction prevention plunger (620) may open / close the malfunction prevention opening / closing hole (611-33) by vertical movement of the malfunction prevention plunger (620) in the first opening / closing space (611-31) below the malfunction prevention opening / closing hole (611-33).

[0055] The plunger moving drive plate (630) may be movably arranged on the malfunction prevention valve body (610) so that one side thereof is connected to the malfunction prevention plunger (620). For example, the plunger moving drive plate (630) may have a lower side thereof connected to the malfunction prevention plunger (620). The plunger moving drive plate (630) may be movably arranged in the malfunction prevention space (612). A malfunction prevention bellows (650) may be connected to the other side of the plunger moving drive plate (630). In addition, the pressure of the second pressure space (612-2), which is the interior of the malfunction prevention bellows (650), may act on the other side of the plunger moving drive plate (630). In other words, the pressure inside the containment vessel (200), which is outside the malfunction prevention valve (600), may act on the other surface of the plunger moving drive plate (630). In addition, the elastic force of the malfunction prevention valve elastic member (640) may act on the other surface of the plunger moving drive plate (630). The elastic force of the malfunction prevention valve elastic member (640) may act on the other surface of the plunger moving drive plate (630) in the direction in which the malfunction prevention plunger (620) opens the malfunction prevention opening / closing hole (611-33). The pressure of the first pressure space (612-1) may act on one surface of the plunger moving drive plate (630). In other words, the pressure of the reactor (100) may act on one surface of the plunger moving drive plate (630). The plunger moving drive plate (630) can move in the malfunction-prevention space (612) by the force due to the pressure difference between the first pressure space (612-1) and the second pressure space (612-2) acting on the plunger moving drive plate (630) and the elastic force of the malfunction-prevention elastic member (640). In other words, the plunger moving drive plate (630) can move in the malfunction-prevention space (612) by the force due to the pressure difference between the pressure of the reactor (100) and the pressure inside the containment vessel (200) and the elastic force of the malfunction-prevention elastic member (640). By the movement of the plunger moving drive plate (630), the malfunction-prevention plunger (620) can move to open and close the malfunction-prevention opening / closing hole (611-33).

[0056] For example, a malfunction prevention bellows (650) may be connected to the upper surface of the plunger moving drive plate (630). In addition, the pressure of the second pressure space (612-2), which is the interior of the malfunction prevention bellows (650), may act on the upper surface of the plunger moving drive plate (630). In other words, the pressure inside the containment vessel (200), which is the exterior of the malfunction prevention valve (600), may act on the upper surface of the plunger moving drive plate (630). In addition, the elastic force of the malfunction prevention valve elastic member (640) may act on the upper surface of the plunger moving drive plate (630). The elastic force of the malfunction prevention valve elastic member (640) may act downward in the direction in which the malfunction prevention plunger (620) opens the malfunction prevention opening / closing hole (611-33) on the upper surface of the plunger moving drive plate (630). In addition, the pressure of the first pressure space (612-1) may act on the lower surface of the plunger moving drive plate (630). In other words, the pressure of the reactor (100) may act on the lower surface of the plunger moving drive plate (630). The plunger moving drive plate (630) may move up and down in the malfunction prevention space (612) due to the force caused by the pressure difference between the first pressure space (612-1) and the second pressure space (612-2) acting on the plunger moving drive plate (630) and the elastic force of the malfunction prevention elastic member (640). In other words, the plunger moving drive plate (630) can move up and down in the malfunction prevention space (612) by the force due to the pressure difference between the reactor (100) and the pressure inside the containment vessel (200) and the elastic force of the malfunction prevention elastic member (640). In addition, the malfunction prevention plunger (620) can move up and down by the vertical movement of the plunger moving drive plate (630) to open and close the malfunction prevention opening and closing hole (611-33). In other words, the malfunction prevention opening and closing hole (611-33) can be opened by the downward movement of the plunger moving drive plate (630) and the downward movement of the malfunction prevention plunger (620).In addition, the plunger moving drive plate (630) moves upward, and the malfunction prevention plunger (620) moves upward, so that the malfunction prevention opening / closing hole (611-33) can be closed.

[0057] The plunger moving drive plate (630) can divide the first pressure space (612-1) into two spaces, one in contact with one surface of the plunger moving drive plate (630) and the other in contact with the other surface. For example, the plunger moving drive plate (630) can divide the first pressure space (612-1) of the malfunction prevention space (612) into a lower space in contact with the lower surface of the plunger moving drive plate (630) and an upper space in contact with the upper surface.

[0058] The malfunction prevention valve elastic member (640) can provide elastic force to the plunger moving drive plate (630) in the direction in which the malfunction prevention plunger (620) opens the malfunction prevention passage (611). The malfunction prevention valve elastic member (640) can provide elastic force to the plunger moving drive plate (630) in the direction in which the malfunction prevention plunger (620) opens the malfunction prevention opening / closing hole (611-33) of the malfunction prevention passage (611). For example, the malfunction prevention valve elastic member (640) can provide downward elastic force to the plunger moving drive plate (630). The malfunction prevention valve elastic member (640) can be arranged in the second pressure space (612-2). In other words, the malfunction prevention valve elastic member (640) can be placed inside the malfunction prevention bellows (650).

[0059] The malfunction prevention bellows (650) can block the communication between the first pressure space (612-1) and the second pressure space (612-2) of the malfunction prevention space (612). The first pressure space (612-1) may be the malfunction prevention space (612) outside the malfunction prevention bellows (650), and the second pressure space (612-2) may be the malfunction prevention space (612) inside the malfunction prevention bellows (650). The malfunction prevention bellows (650) may be arranged in the malfunction prevention space (612) so as to be connected to the other surface of the malfunction prevention valve body (610) and the plunger moving drive plate (630). For example, the upper part of the malfunction prevention bellows (650) may be connected to the malfunction prevention valve body (610) and the lower part may be placed in the malfunction prevention space (612) so as to be connected to the upper surface of the plunger moving drive plate (630).

[0060] The malfunction prevention communication passage (660) can provide a passage through which the first connecting passage (611-1) and the first pressure space (612-1) are connected. The malfunction prevention communication passage (660) can be connected to the first connecting passage (611-1) and the first pressure space (612-1). The first connecting passage (611-1) and the first pressure space (612-1) are connected by the malfunction prevention communication passage (660), and the pressure of the first pressure space (612-1) can be made equal to the pressure of the first connecting passage (611-1). In other words, the pressure of the first pressure space (612-1) can be made equal to the pressure of the reactor (100) by the malfunction prevention communication passage (660). The malfunction prevention communication passage (660) can be connected to the first connecting passage (611-1) and the first pressure space (612-1).

[0061] The communication-prevention bellows (670) can prevent communication between the first pressure space (612-1) and the second opening / closing space (611-32) so that the pressure in the first pressure space (612-1) does not become the same as the pressure in the second opening / closing space (611-32). The communication-prevention bellows (670) can be arranged in the first pressure space (612-1) so that the malfunction-prevention plunger (620) passes through it and is connected to one surface of the plunger moving drive plate (630) and the malfunction-prevention valve body (610). For example, the communication-prevention bellows (670) can be arranged in the first pressure space (612-1) so that the malfunction-prevention plunger (620) passes through it and the upper portion is connected to the lower surface of the plunger moving drive plate (630) and the lower portion is connected to the malfunction-prevention valve body (610).

[0062] The working fluid passage (700) can provide a passage for the working fluid to flow between two or more of the main valve (300), the reset valve (400), the trip valve (500), and the malfunction prevention 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 third working fluid flow passage (740), and a fourth working fluid flow passage (750).

[0063] 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).

[0064] 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.

[0065] The second working fluid flow passage (730) can provide a space for the working fluid to flow between the malfunction prevention valve (600) and the first working fluid flow passage (720). The second working fluid flow passage (730) is connected to the malfunction prevention valve (600) and the first working fluid flow passage (720) and can be a flow pipe through which the working fluid flows. The second working fluid flow passage (730) can be connected to the malfunction prevention valve (600) and the first working fluid flow passage (720). The second working fluid flow passage (730) can be connected to the second connection path (611-2) of the malfunction prevention valve (600) and the first working fluid flow passage (720).

[0066] The third working fluid flow passage (740) can provide a passage for the working fluid to flow between the main valve (300) and the malfunction prevention valve (600). The third working fluid flow passage (740) is connected to the main valve (300) and the malfunction prevention valve (600) and can be a flow pipe for the working fluid to flow. The third working fluid flow passage (740) can be connected to the main valve (300) and the malfunction prevention valve (600). The third working fluid flow passage (740) can be connected to the flow passage connection passage (314) of the main valve (300) and the first connection passage (611-1) of the malfunction prevention valve (600).

[0067] The fourth 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 fourth 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.

[0068] Hereinafter, with reference to FIGS. 3 to 10, the operation and effect of a malfunction valve (600) having the configuration described above and a nuclear power facility (1) including the same will be described.

[0069] 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, the trip valve (500) may be closed, and the malfunction prevention valve (600) may be opened. For example, electricity may be supplied to the reset valve (400) through the reset valve controller to open the reset valve (400). Additionally, electricity may be supplied to the trip valve (500) through the trip valve controller to close the trip valve (500).

[0070] With this operation, the operating fluid of the operating fluid supply source (2) can be supplied to the malfunction prevention valve (600) through the operating fluid supply passage (710), the reset valve (400), the first operating fluid flow passage (720), and the second operating fluid flow passage (730).

[0071] Meanwhile, when the reactor (100) is in the initial stage of operation, the pressure of the reactor (100) may be lower than the normal operating pressure, which is the pressure during normal operation. Therefore, the difference between the pressure of 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 of the first pressure space (612-1) and the pressure of the second pressure space (612-2) of the malfunction prevention valve (600) may also be less than a predetermined pressure difference. The predetermined pressure difference may be less than the pressure difference between the pressure of the reactor (100) and the pressure inside the containment vessel (200) during normal operation of the reactor (100) and greater than the pressure difference between the pressure of the working fluid provided to the main valve plunger (320) through the reset valve (400) to close the main valve (300) and the pressure inside the containment vessel (200). In addition, the force due to the difference between the pressure of the first pressure space (612-1) and the pressure of the second pressure space (612-2) may be less than the elastic force of the malfunction-prevention elastic member (640). In addition, the force due to the supply pressure of the operating fluid may also be less than the elastic force of the malfunction-prevention elastic member (640). In addition, the malfunction-prevention plunger (620) can maintain the position in which the malfunction-prevention opening / closing hole (611-33) is opened by the elastic force of the malfunction-prevention elastic member (640) acting on the plunger moving driving plate (630). For example, the malfunction-prevention plunger (620) can maintain the lowered position in which the malfunction-prevention opening / closing hole (611-33) is opened by the elastic force of the malfunction-prevention elastic member (640) acting on the plunger moving driving plate (630). Accordingly, the operating fluid supplied to the malfunction prevention valve (600) can pass through the malfunction prevention passage (611) and be supplied to the main valve (300) through the third operating fluid flow passage (740).

[0072] When the working fluid is supplied to the main valve (300), the working fluid flows through the flow passage connecting passage (314), and a force due to the supply pressure of the working fluid can be applied to the main valve plunger (320). In addition, when the main valve plunger (320) overcomes the elastic force of the main valve elastic member (330) and moves to close the main valve opening / closing hole (313) due to the force due to the supply pressure of the working fluid, the main valve (300) can be closed. 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.

[0073] Referring to FIGS. 5 and 6, during normal operation of the reactor (100), the pressure of the reactor (100) can be increased to the normal operation pressure. Therefore, the difference between the pressure of 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 of the first pressure space (612-1) and the pressure of the second pressure space (612-2) of the malfunction prevention valve (600) can also be greater than or equal to a predetermined pressure difference. In addition, the force due to the difference between the pressure of the first pressure space (612-1) and the pressure of the second pressure space (612-2) can be greater than the elastic force of the malfunction prevention elastic member (640). In addition, the malfunction prevention plunger (620) can be moved and positioned to close the malfunction prevention opening / closing hole (611-33) by a force due to the difference between the pressure of the first pressure space (612-1) and the pressure of the second pressure space (612-2) acting on the plunger moving drive plate (630). For example, the malfunction prevention plunger (620) can be moved and positioned upward to close the malfunction prevention opening / closing hole (611-33) by a force due to the difference between the pressure of the first pressure space (612-1) and the pressure of the second pressure space (612-2) acting on the plunger moving drive plate (630). In addition, the malfunction prevention elastic member (640) can be compressed by a force resulting from the difference in pressure between the first pressure space (612-1) and the second pressure space (612-2) acting on the plunger moving drive plate (630).

[0074] Referring to FIGS. 7 and 8, the trip valve (500) may be opened unintentionally due to an operator's mistake, etc. during normal operation of the reactor (100). In other words, the trip valve (500) may be opened unintentionally due to an operator's mistake, etc. 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) may be maintained at the normal operating pressure. Accordingly, a force greater than or equal to a predetermined pressure difference may continue to act on the plunger moving drive plate (630). In addition, the malfunction prevention plunger (620) may maintain the malfunction prevention opening / closing hole (611-33) in a closed state by a force greater than or equal to a predetermined pressure difference acting on the plunger moving drive plate (630). In addition, even if the trip valve (500) opens due to a driver's mistake, etc., the malfunction prevention valve (600) may not open, so the main valve (300) may not open. In other words, malfunction can be prevented.

[0075] 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.

[0076] In the event of an accident in the reactor (100), the pressure of the reactor (100) may become lower than the normal operating pressure. Therefore, the difference between the pressure of 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 of the first pressure space (612-1) and the pressure of the second pressure space (612-2) 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 of the first pressure space (612-1) and the pressure of the second pressure space (612-2) may be less than the elastic force of the malfunction prevention elastic member (640). In addition, the malfunction prevention plunger (620) may move to open the malfunction prevention opening / closing hole (611-33) by the elastic force of the malfunction prevention elastic member (640) acting on the plunger moving drive plate (630). For example, the malfunction prevention plunger (620) can move downward to open the malfunction prevention opening / closing hole (611-33) by the elastic force of the malfunction prevention elastic member (640) acting on the plunger moving drive plate (630).

[0077] 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 flow passage connecting passage (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) is recirculated into the reactor (100), so that emergency core cooling can be achieved. The working fluid discharged from the main valve (300) can flow to the trip valve (500) through the third working fluid flow passage (740), the malfunction prevention passage (611) of the malfunction prevention valve (600), the second working fluid flow passage (730), and the first working fluid flow passage (720). The working fluid that has flowed to the trip valve (500) can flow into the containment vessel (200) through the fourth working fluid flow passage (750).

[0078] In this way, the first embodiment of the malfunction prevention valve (600) and the nuclear power plant (1) including the same has a malfunction prevention valve (600) that prevents the main valve (300) for emergency core cooling from malfunctioning by opening during normal operation of the nuclear reactor (100) and can reliably prevent malfunction with a relatively simple configuration.

[0079] Meanwhile, in addition to this configuration, according to the second embodiment of the present invention, the plunger passage hole (614) can be connected to the first opening / closing space (611-31).

[0080] Hereinafter, a second embodiment will be described with reference to FIGS. 11 to 14. In describing the second embodiment of the present invention, compared to the above-described embodiment, there is a difference in that the plunger passage hole (614) is connected to the first opening / closing space (611-31). Therefore, the description will focus on this difference, and the same description and drawing reference numerals refer to the above-described embodiments.

[0081] Referring to FIGS. 11 to 14, the plunger passage hole (614) may be connected to the first opening / closing space (611-31). In addition, the first opening / closing space (611-31) may be arranged above the second opening / closing space (611-32) and connected to the first connecting passage (611-1). In addition, the second opening / closing space (611-32) may be arranged below the malfunction-prevention opening / closing hole (611-33), and the first opening / closing space (611-31) may be arranged above the malfunction-prevention opening / closing hole (611-33). In addition, the malfunction prevention plunger (620) can open and close the malfunction prevention opening and closing hole (611-33) by passing through the plunger passage hole (614), the first opening and closing space (611-31), and the malfunction prevention opening and closing hole (611-33). In other words, the malfunction prevention plunger (620) can open and close the malfunction prevention opening and closing hole (611-33) at a portion disposed in the second opening and closing space (611-32). For example, the lower portion of the malfunction prevention plunger (620) can open and close the malfunction prevention opening and closing hole (611-33) by vertical movement of the malfunction prevention plunger (620) in the second opening and closing space (611-32) below the malfunction prevention opening and closing hole (611-33).

[0082] In this configuration, the first pressure space (612-1) may not be connected to the second opening / closing space (611-32). In other words, the pressure of the first pressure space (612-1) may not be equal to the pressure of the second opening / closing space (611-32). Therefore, the communication-preventing bellows (670) may not need to be arranged in the first pressure space (612-1) to prevent communication between the first pressure space (612-1) and the second opening / closing space (611-32). In other words, in the case of the second embodiment, the communication-preventing bellows (670) may not be included.

[0083] Meanwhile, in addition to these configurations, according to the third embodiment of the present invention, the first pressure space (612-1) is a malfunction-prevention space (612) inside the malfunction-prevention bellows (650), the second pressure space (612-2) is a malfunction-prevention space (612) outside the malfunction-prevention bellows (650), and the plunger passage hole (614) can be connected to the second pressure space (612-2).

[0084] Hereinafter, a third embodiment will be described with reference to FIGS. 15 to 18. In describing the third embodiment of the present invention, compared to the above-described embodiments, there is a difference in that the first pressure space (612-1) is a malfunction-prevention space (612) inside the malfunction-prevention bellows (650), the second pressure space (612-2) is a malfunction-prevention space (612) outside the malfunction-prevention bellows (650), and the plunger passage hole (614) is connected to the second pressure space (612-2). The description will focus on these differences, and the same description and drawing reference numerals refer to the above-described embodiments.

[0085] Referring to FIGS. 15 to 18, the first pressure space (612-1) may be a malfunction-prevention space (612) inside the malfunction-prevention bellows (650), and the second pressure space (612-2) may be a malfunction-prevention space (612) outside the malfunction-prevention bellows (650).

[0086] In addition, the plunger passage hole (614) may be connected to the second pressure space (612-2). In addition, the plunger passage hole (614) may be connected to the first opening / closing space (611-31). In other words, the first opening / closing space (611-31) may be arranged above the second opening / closing space (611-32) and may be connected to the first connecting passage (611-1). In addition, the second opening / closing space (611-32) may be arranged below the malfunction-prevention opening / closing hole (611-33), and the first opening / closing space (611-31) may be arranged above the malfunction-prevention opening / closing hole (611-33).

[0087] In addition, the anti-combustion bellows (670) can prevent communication between the second pressure space (612-2) and the first opening / closing space (611-31). The anti-combustion bellows (670) can be placed in the second pressure space (612-2) so that the anti-combustion plunger (620) passes through it and is connected to one side of the plunger moving drive plate (630) and the anti-combustion valve body (610).

[0088] Additionally, the malfunction-preventing elastic member (640) may be placed in the first pressure space (612-1). In other words, the malfunction-preventing elastic member (640) may be placed inside the malfunction-preventing bellows (670).

[0089] In addition, the malfunction prevention plunger (620) can open and close the malfunction prevention opening / closing hole (611-33) at the part disposed in the first opening / closing space (611-31). In other words, the malfunction prevention plunger (620) may not pass through the malfunction prevention opening / closing hole (611-33). For example, when the malfunction prevention plunger (620) moves downward, the lower part of the malfunction prevention plunger (620) can close the malfunction prevention opening / closing hole (611-33). In addition, when the malfunction prevention plunger (620) moves upward, the lower part of the malfunction prevention plunger (620) can open the malfunction prevention opening / closing hole (611-33). In addition, the malfunction-prevention elastic member (640) can provide elastic force to the plunger moving drive plate (630) so that the malfunction-prevention plunger (620) moves upward. In other words, the malfunction-prevention elastic member (640) can apply elastic force to the plunger moving drive plate (630) upward.

[0090] Meanwhile, in addition to these configurations, according to the fourth embodiment of the present invention, a malfunction-preventing elastic member (640) can be placed in the second pressure space (612-2).

[0091] Hereinafter, a fourth embodiment will be described with reference to FIGS. 19 to 22. In describing the fourth embodiment of the present invention, compared to the above-described embodiments, there is a difference in that the malfunction-preventing elastic member (640) is arranged in the second pressure space (612-2). Therefore, the description will focus on this difference, and the same description and drawing reference numerals will be used in the above-described embodiments.

[0092] Referring to FIGS. 19 to 22, the malfunction-preventing elastic member (640) may be disposed in the second pressure space (612-2). In other words, the malfunction-preventing elastic member (640) may be disposed between one surface of the plunger moving drive plate (630) and the malfunction-preventing valve body (610) in the malfunction-preventing space (612). For example, the malfunction-preventing elastic member (640) may be disposed between the lower surface of the plunger moving drive plate (630) and the malfunction-preventing valve body (610) in the malfunction-preventing space (612).

[0093] Meanwhile, in addition to this configuration, according to the fifth embodiment of the present invention, a second opening / closing passage (611-35) may be formed. The second opening / closing passage (611-35) may be formed in the malfunction prevention opening / closing space (611-3). The second opening / closing passage (611-35) may be connected to the first connection passage (611-1), the first opening / closing passage (611-34), and the second connection passage (611-2). The second opening / closing passage (611-35) may be opened / closed by another part of the malfunction prevention plunger (620).

[0094] Hereinafter, a fifth embodiment will be described with reference to FIGS. 23 to 26. In describing the fifth embodiment of the present invention, compared to the above-described embodiments, there is a difference in that a first opening / closing passage (611-3) is formed in the malfunction prevention opening / closing space (611-3) that is connected to the first connecting passage (611-1) and opened / closed by a part of the malfunction prevention plunger (620), and a second opening / closing passage (611-35) is formed that is connected to the second connecting passage (611-2) and opened / closed by another part of the malfunction prevention plunger (620). The description will focus on these differences, and the same descriptions and drawing references refer to the above-described embodiments.

[0095] Referring to FIGS. 23 to 26, a first opening / closing passage (611-3) connected to the first connecting passage (611-1) and opened / closed by a part of the malfunction-prevention plunger (620) and a second opening / closing passage (611-35) connected to the second connecting passage (611-2) and opened / closed by another part of the malfunction-prevention plunger (620) may be formed in the malfunction-prevention opening / closing space (611-3).

[0096] For example, the first switching path (611-34) is connected to the first connecting path (611-1) and may extend a predetermined length from the first connecting path (611-1) toward the second connecting path (611-2) to the malfunction-prevention switching space (611-3). In addition, the second switching path (611-35) is connected to the second connecting path (611-2) and may extend a predetermined length from the second connecting path (611-2) toward the first connecting path (611-1) to the malfunction-prevention switching space (611-3). The predetermined length may be shorter than the length of the lower portion of the malfunction-prevention plunger (620). In addition, one side of the lower portion of the malfunction prevention plunger (620) can open and close the first opening and closing passage (611-34), and the other side of the lower portion of the malfunction prevention plunger (620) can open and close the second opening and closing passage (611-35). In addition, one side and the other side of the lower portion of the malfunction prevention plunger (620) can be inclined in opposite directions. In addition, the opening and closing side of the first opening and closing passage (611-34) can be inclined in the same direction as one side of the lower portion of the malfunction prevention plunger (620), and the opening and closing side of the second opening and closing passage (611-35) can be inclined in the same direction as the other side of the lower portion of the malfunction prevention plunger (620).

[0097] Meanwhile, in addition to this configuration, according to the sixth embodiment of the present invention, a drive plate pressure equalization hole (630-1) may be formed in the plunger moving drive plate (630).

[0098] Hereinafter, a sixth embodiment will be described with reference to FIG. 27. In describing the sixth embodiment of the present invention, there is a difference from the above-described embodiments in that a drive plate pressure equalization hole (630-1) is formed in the plunger moving drive plate (630). This difference will be mainly described, and the same description and drawing reference numerals will be used in the above-described embodiments.

[0099] Referring to Fig. 27, a drive plate pressure equalization hole (630-1) may be formed in the plunger moving drive plate (630). The drive plate pressure equalization hole (630-1) may connect a first pressure space (612-1) on one side of the plunger moving drive plate (630) and a first pressure space (612-1) on the other side of the plunger moving drive plate (630) with each other, or may connect a second pressure space (612-2) on one side of the plunger moving drive plate (630) and a second pressure space (612-2) on the other side of the plunger moving drive plate (630) with each other.

[0100] When the first pressure space (612-1) is a malfunction prevention space (612) outside the malfunction prevention bellows (650) and the second pressure space (612-2) is a malfunction prevention space (612) inside the malfunction prevention bellows (650), the driving plate pressure equalization hole (630-1) can connect the first pressure space (612-1) on one side of the plunger moving driving plate (630) and the first pressure space (612-1) on the other side of the plunger moving driving plate (630) to each other. The drive plate pressure equalization hole (630-1) connects the first pressure space (612-1) on one side of the plunger moving drive plate (630) and the first pressure space (612-1) on the other side of the plunger moving drive plate (630) to each other, so that the plunger moving drive plate (630) can easily move in the malfunction prevention space (612). In addition, the pressure of the first pressure space (612-1) on one side of the plunger moving drive plate (630) and the pressure of the first pressure space (612-1) on the other side of the plunger moving drive plate (630) can be equalized.

[0101] For example, the first pressure space (612-1) may include a first pressure space (612-1) on the upper side of the plunger moving drive plate (630) and a first pressure space (612-1) on the lower side of the plunger moving drive plate (630). In addition, the driving plate pressure equalization hole (630-1) may be connected to the first pressure space (612-1) on the upper side of the plunger moving drive plate (630) and the first pressure space (621-1) on the lower side of the plunger moving drive plate (630), thereby allowing the first pressure space (612-1) on the upper side of the plunger moving drive plate (630) and the first pressure space (612-1) on the lower side of the plunger moving drive plate (630) to be communicated with each other.

[0102] When the first pressure space (612-1) is a malfunction prevention space (612) inside the malfunction prevention bellows (650) and the second pressure space (612-2) is a malfunction prevention space (612) outside the malfunction prevention bellows (650), the driving plate pressure equalization hole (630-1) can connect the second pressure space (612-2) on one side of the plunger moving driving plate (630) and the second pressure space (612-2) on the other side of the plunger moving driving plate (630) to each other. The drive plate pressure equalization hole (630-1) connects the second pressure space (612-2) on one side of the plunger moving drive plate (630) and the second pressure space (612-2) on the other side of the plunger moving drive plate (630) to each other, so that the plunger moving drive plate (630) can easily move in the malfunction prevention space (612). In addition, the pressure of the second pressure space (612-2) on one side of the plunger moving drive plate (630) and the pressure of the second pressure space (612-2) on the other side of the plunger moving drive plate (630) can be equalized to each other.

[0103] For example, the second pressure space (612-2) may include a second pressure space (612-2) on the upper side of the plunger moving drive plate (630) and a second pressure space (612-2) on the lower side of the plunger moving drive plate (630). In addition, the driving plate pressure equalization hole (630-1) may be connected to the second pressure space (612-2) on the upper side of the plunger moving drive plate (630) and the second pressure space (621-2) on the lower side of the plunger moving drive plate (630), thereby allowing the second pressure space (612-2) on the upper side of the plunger moving drive plate (630) and the second pressure space (612-2) on the lower side of the plunger moving drive plate (630) to be connected.

[0104] Meanwhile, in addition to these configurations, according to the seventh embodiment of the present invention, a body pressure equalization path (615) may be formed in the malfunction prevention valve body (610).

[0105] Hereinafter, a seventh embodiment will be described with reference to FIG. 28. In describing the seventh embodiment of the present invention, compared to the above-described embodiments, there is a difference in that a body pressure equalization passage (615) is formed in the malfunction prevention valve body (610). This difference will be mainly described, and the same description and drawing reference numerals will be used in the above-described embodiments.

[0106] Referring to Fig. 28, a body pressure equalization passage (615) may be formed in the malfunction prevention valve body (610). The body pressure equalization passage (615) may connect a first pressure space (612-1) on one side of the plunger movement drive plate (630) and a first pressure space (612-1) on the other side of the plunger movement drive plate (630) with each other, or may connect a second pressure space (612-2) on one side of the plunger movement drive plate (630) and a second pressure space (612-2) on the other side of the plunger movement drive plate (630).

[0107] When the first pressure space (612-1) is a malfunction prevention space (612) outside the malfunction prevention bellows (650) and the second pressure space (612-2) is a malfunction prevention space (612) inside the malfunction prevention bellows (650), the body pressure equalization passage (615) can connect the first pressure space (612-1) on one side of the plunger movement drive plate (630) and the first pressure space (612-1) on the other side of the plunger movement drive plate (630) to each other. The body pressure equalization passage (615) connects the first pressure space (612-1) on one side of the plunger moving drive plate (630) and the first pressure space (612-1) on the other side of the plunger moving drive plate (630) to each other, so that the plunger moving drive plate (630) can easily move in the malfunction prevention space (612). In addition, the pressure of the first pressure space (612-1) on one side of the plunger moving drive plate (630) and the pressure of the first pressure space (612-1) on the other side of the plunger moving drive plate (630) can be equalized.

[0108] For example, the first pressure space (612-1) may include a first pressure space (612-1) on the upper side of the plunger moving drive plate (630) and a first pressure space (612-1) on the lower side of the plunger moving drive plate (630). In addition, the body pressure equalization passage (615) may be connected to the first pressure space (612-1) on the upper side of the plunger moving drive plate (630) and the first pressure space (621-1) on the lower side of the plunger moving drive plate (630), thereby allowing the first pressure space (612-1) on the upper side of the plunger moving drive plate (630) and the first pressure space (612-1) on the lower side of the plunger moving drive plate (630) to be communicated with each other.

[0109] When the first pressure space (612-1) is a malfunction prevention space (612) inside the malfunction prevention bellows (650) and the second pressure space (612-2) is a malfunction prevention space (612) outside the malfunction prevention bellows (650), the body pressure equalization passage (615) can connect the second pressure space (612-2) on one side of the plunger movement drive plate (630) and the second pressure space (612-2) on the other side of the plunger movement drive plate (630) to each other. The body pressure equalization passage (615) connects the second pressure space (612-2) on one side of the plunger moving drive plate (630) and the second pressure space (612-2) on the other side of the plunger moving drive plate (630), so that the plunger moving drive plate (630) can easily move in the malfunction prevention space (612). In addition, the pressure of the second pressure space (612-2) on one side of the plunger moving drive plate (630) and the pressure of the second pressure space (612-2) on the other side of the plunger moving drive plate (630) can be equalized to each other.

[0110] For example, the second pressure space (612-2) may include a second pressure space (612-2) on the upper side of the plunger moving drive plate (630) and a second pressure space (612-2) on the lower side of the plunger moving drive plate (630). In addition, the body pressure equalization passage (615) may be connected to the second pressure space (612-2) on the upper side of the plunger moving drive plate (630) and the second pressure space (621-2) on the lower side of the plunger moving drive plate (630), thereby connecting the second pressure space (612-2) on the upper side of the plunger moving drive plate (630) and the second pressure space (612-2) on the lower side of the plunger moving drive plate (630).

[0111] 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 malfunction-prevention valve body with a malfunction-prevention path formed; A malfunction-prevention plunger movably arranged on the malfunction-prevention valve body to open and close the malfunction-prevention passage; A plunger moving drive plate movably arranged on the malfunction-prevention valve body so that one side is connected to the malfunction-prevention plunger; and The above malfunction-prevention plunger includes a malfunction-prevention elastic member that provides elastic force to the plunger moving drive plate in the direction of opening the malfunction-prevention path, The force due to the difference between the pressure on one side of the above malfunction prevention path and the external pressure is configured to be provided to the plunger moving drive plate in the direction in which the above malfunction prevention plunger closes the above malfunction prevention path. Anti-failure valve.

2. In paragraph 1, In the above malfunction prevention valve body, a malfunction prevention space is formed in which the plunger moving drive plate and at least a part of the malfunction prevention plunger are movably arranged. The above malfunction prevention space includes a first pressure space connected to one side of the above malfunction prevention passage and a second pressure space connected to the outside. Anti-failure valve.

3. In paragraph 2, The above malfunction prevention valve body has an external communication hole formed to connect the outside and the second pressure space. When the volume of the second pressure space changes, fluid flows into and out of the second pressure space through the external communication hole. Anti-failure valve.

4. In paragraph 2, The above malfunction prevention euro is A first connecting passage communicating with the first pressure space; Second connecting route; and Including a malfunction prevention opening / closing space connected to the first connecting passage and the second connecting passage and in which at least a part of the malfunction prevention plunger is movably arranged. Anti-failure valve.

5. In paragraph 4, The above malfunction prevention opening and closing space is, A first opening space connected to the first connecting passage; A second open / closed space connected to the second connecting passage; and Including a malfunction prevention opening / closing hole that is connected to the first opening / closing space and the second opening / closing space and is opened / closed by the malfunction prevention plunger. Anti-failure valve.

6. In paragraph 5, A malfunction prevention bellows which is arranged in the malfunction prevention space so as to be connected to the other surface of the malfunction prevention valve body and the plunger moving drive plate and blocks communication between the first pressure space and the second pressure space; and Further comprising a malfunction prevention communication passage connected to the first connecting passage and the first pressure space, Anti-failure valve.

7. In paragraph 6, The above malfunction prevention valve body further has a plunger passage hole formed therein, which is connected to the malfunction prevention space and the malfunction prevention opening / closing space so that the malfunction prevention plunger can movably pass through. Anti-failure valve.

8. In paragraph 7, The above first pressure space is the above malfunction-prevention space outside the above malfunction-prevention bellows, and the above second pressure space is the above malfunction-prevention space inside the above malfunction-prevention bellows. The above plunger passage hole is connected to the first pressure space, Anti-failure valve.

9. In paragraph 8, The above malfunction prevention plunger passes through the above malfunction prevention opening / closing hole and opens / closes the above malfunction prevention opening / closing hole. Anti-failure valve.

10. In paragraph 9, The above plunger passage hole is connected to the second opening space, The above malfunction-prevention plunger passes through and further includes a communication-prevention bellows that is arranged in the first pressure space to be connected to one side of the plunger moving drive plate and the malfunction-prevention valve body, thereby preventing communication between the first pressure space and the second opening / closing space. Anti-failure valve.

11. In paragraph 9, The above plunger passage hole is connected to the first opening space. Anti-failure valve.

12. In paragraph 9, The above malfunction prevention elastic member is placed in the second pressure space. Anti-failure valve.

13. In paragraph 7, The above first pressure space is the above malfunction-prevention space inside the above malfunction-prevention bellows, and the above second pressure space is the above malfunction-prevention space outside the above malfunction-prevention bellows. The above plunger passage hole is connected to the second pressure space, Anti-failure valve.

14. In paragraph 13, The above plunger passage hole is connected to the first opening space, The above malfunction-prevention plunger passes through and is connected to one side of the plunger moving drive plate and the above malfunction-prevention valve body, and further includes a communication-prevention bellows that prevents communication between the second pressure space and the first opening / closing space. Anti-failure valve.

15. In paragraph 13, The above malfunction prevention elastic member is placed in the first pressure space. Anti-failure valve.

16. In paragraph 13, The above malfunction prevention elastic member is placed in the second pressure space. Anti-failure valve.

17. In paragraph 4, In the above malfunction prevention opening and closing space, A first opening / closing passage connected to the first connecting passage and opened / closed by any part of the malfunction prevention plunger; and A second opening / closing passage is formed, which is connected to the second connecting passage and is opened / closed by another part of the malfunction prevention plunger. Anti-failure valve.

18. In paragraph 2, In the above plunger moving drive plate, A drive plate pressure equalization hole is formed to connect the first pressure space on one side of the plunger moving drive plate and the first pressure space on the other side of the plunger moving drive plate to each other, or to connect the second pressure space on one side of the plunger moving drive plate and the second pressure space on the other side of the plunger moving drive plate to each other. Anti-failure valve.

19. In paragraph 2, In the above malfunction prevention valve body, A body pressure equalization passage is formed, which connects the first pressure space on one side of the plunger moving drive plate and the first pressure space on the other side of the plunger moving drive plate, or connects the second pressure space on one side of the plunger moving drive plate and the second pressure space on the other side of the plunger moving drive plate. Anti-failure valve.

20. 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 interior of the reactor, configured to be opened and closed so as to selectively communicate the interior of the reactor and the interior of the containment vessel, 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 malfunction prevention valve configured to allow the operating fluid to flow to the main valve when the reset valve is opened and to allow the operating 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 section that provides a passage for operating fluid to flow between two or more of the main valve, the reset valve, the trip valve, and the malfunction prevention valve. The above malfunction prevention valve is configured to open and close depending on the difference between the pressure of the reactor and the pressure inside the containment vessel. Nuclear power plants.

21. In paragraph 20, The above malfunction prevention valve is, A malfunction-prevention valve body having a malfunction-prevention path formed, one side of which is connected to the main valve and the other side of which is connected to the reset valve and the trip valve; A malfunction-prevention plunger movably arranged on the malfunction-prevention valve body to open and close the malfunction-prevention passage; A plunger moving drive plate movably arranged on the malfunction-prevention valve body so that one side is connected to the malfunction-prevention plunger; and The above malfunction-prevention plunger includes a malfunction-prevention elastic member that provides elastic force to the plunger moving drive plate in the direction of opening the malfunction-prevention path, The force due to the difference between the pressure on one side of the malfunction prevention path and the pressure inside the containment vessel is configured to be provided to the plunger moving drive plate in the direction in which the malfunction prevention plunger closes the malfunction prevention path. Nuclear power plants.

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