Nuclear reactor valve device

Abstract

The nuclear reactor valve device includes: a main flow path connected to a nuclear reactor vessel and a containment vessel accommodating the nuclear reactor vessel and providing a passage for allowing a coolant in the containment vessel to flow into the nuclear reactor vessel; a main valve assembly configured to open or close the main flow path; a trip valve configured to block fluid from being discharged from the main valve assembly, thereby causing the main valve assembly to close the main flow path, or allow the fluid to be discharged from the main valve assembly, thereby causing the main valve assembly to open the main channel; a flow channel connected to the main valve assembly and the trip valve to provide a passage through which the fluid flows; and a malfunction prevention valve assembly configured to open or close the flow channel to prevent the main flow path from being opened due to malfunction of the trip valve.

Description

reactor valve unit

[0001] The present invention relates to a reactor valve device.

[0002] This study is related to the Development of a High-Reliability Valve Concept for an Innovative SMR Emergency Core Cooling System (Project Identification Number: 1415187085, Project No.: 20228540000010, Research Period: 2023.05.01 ~ 2023.12.31) of the Energy International Joint Research Project, which was conducted at the Korea Atomic Energy Research Institute with support from the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and funded by the Ministry of Trade, Industry and Energy (Government).

[0003] A nuclear reactor can passively remove residual core heat in the event of an accident. This reactor comprises a reactor vessel housing the core, a containment vessel surrounding the reactor vessel, a relief valve to relieve the internal pressure of the reactor vessel, and a recirculation valve to recirculate coolant back into the reactor vessel. The relief valve and recirculation valve comprise the main valve assembly.

[0004] In the event of an accident, the main valve of the reactor relief valve opens to allow steam to escape from the reactor vessel. At this time, the released coolant can condense on the heat exchanger of the passive containment cooling system or the outer wall of the containment vessel. The main valve of the reactor recirculation valve can be opened to allow the coolant inside the containment vessel to flow into the reactor vessel. If the level of the condensate inside the containment vessel is higher than the level of the reactor coolant, the coolant can be recirculated from the containment vessel to the reactor through the reactor recirculation valve due to the difference in water head. In other words, in the event of an accident, the residual heat of the core can be removed as the coolant circulates between the inside of the reactor vessel and the containment vessel.

[0005] Additionally, the reactor may further include a trip valve positioned outside the containment vessel and configured to open and close the main valve assembly. In other words, the operator can open the main valve assembly by operating the trip valve.

[0006] However, conventional nuclear reactors have a problem in that if the trip valve is opened due to operator error, the main valve assembly may malfunction and an accident may occur.

[0007] (Prior art literature)

[0008] (Patent Document) Korean Patent Publication No. 10-2021-0079954 (Published on June 30, 2021)

[0009] The problem to be solved by the present invention is to provide a reactor valve device that blocks coolant from flowing into the reactor vessel due to a malfunction of the main valve assembly.

[0010] A reactor valve device according to a first embodiment of the present invention comprises: a main passage connected to a reactor vessel and a containment vessel accommodating the reactor vessel, and providing a passage for allowing coolant of the containment vessel to flow into the interior of the reactor vessel; a main valve assembly opening and closing the main passage; a trip valve blocking discharge of fluid from the main valve assembly so that the main valve assembly closes the main passage, or allowing discharge of the fluid from the main valve assembly so that the main valve assembly opens the main passage; a flow channel connected to the main valve assembly and the trip valve so as to provide a passage for allowing the fluid to flow; And it includes a malfunction prevention valve assembly that opens and closes the flow channel to prevent the main flow path from being opened due to a malfunction of the trip valve, and the malfunction prevention valve assembly closes the flow channel based on the temperature of the reactor vessel to block the fluid of the main valve assembly from being discharged to the outside due to a malfunction of the trip valve, or opens the flow channel to allow the fluid of the main valve assembly to be discharged to the outside by the trip valve.

[0011] The above malfunction prevention valve assembly includes a cylinder connected to the flow channel so as to be arranged inside the containment vessel; a malfunction prevention piston that reciprocates along the length of the cylinder inside the cylinder to open and close the flow channel; and a valve pressurization portion that is supported on the reactor vessel and receives a fluid whose pressure is increased and decreased by the temperature of the reactor vessel, wherein the malfunction prevention piston can be moved inside the cylinder by the pressure of the fluid when the temperature is equal to or higher than a predetermined reference temperature to close the flow channel, and can be moved inside the cylinder by the pressure of the fluid when the temperature is lower than the reference temperature to open the flow channel.

[0012] The cylinder may include a cylinder body including a space in which the malfunction-prevention piston is accommodated, the cylinder body may include a vent hole communicating with the interior of the containment vessel, and a connection port communicating with the flow channel, the malfunction-prevention piston may include a connection passage providing a passage through which the fluid flows, and the malfunction-prevention piston may be pressurized toward the vent hole by the pressure of the fluid when the temperature is equal to or higher than a predetermined reference temperature, and may be spaced apart from the vent hole so that the flow channel and the connection passage are connected when the temperature is lower than the reference temperature.

[0013] The above malfunction prevention valve assembly may further include a cylinder spring that contracts when the malfunction prevention piston moves toward the vent hole and provides a restoring force to the malfunction prevention piston when the malfunction prevention piston moves away from the vent hole; and one or more bellows that contract or extend by movement of the malfunction prevention piston.

[0014] The internal space of the cylinder body is divided into a first space and a second space by the malfunction-preventing piston, the bellows are formed in a plurality, one of the plurality of bellows is arranged in the first space, and another of the plurality of bellows is arranged in the second space, the cylinder spring is arranged in the first space, and the vent hole can be communicated with the first space.

[0015] The above malfunction prevention piston may include a piston head in which the connecting passage is formed; a rod extending from the piston head toward the vent hole; and a piston plate disposed at an end of the rod, and the piston plate may include a through hole.

[0016] The above valve pressurization unit may include a valve chamber that is supported on the reactor vessel and provides a space in which the fluid is accommodated; and a valve tube that has one side connected to the valve chamber and the other side opposite the one side communicates with the internal space of the cylinder body and provides a passage for transmitting the pressure of the fluid to the internal space of the cylinder body.

[0017] The above valve chamber may be arranged on the outer surface of the reactor vessel.

[0018] The above valve chamber can be arranged on the inner surface of the reactor vessel, and the valve tube can penetrate the reactor vessel.

[0019] The above malfunction prevention valve assembly may further include a bracket for transferring heat of the reactor vessel to the valve chamber.

[0020] The main valve assembly may further include a reset valve that operates to allow or block the supply of the fluid, and the flow channel may include a fluid supply path that provides a passage through which the fluid flows between the main valve assembly and the reset valve; and a fluid discharge path that is connected to the fluid supply path and provides a passage through which the fluid discharged from the main valve assembly, through which the trip valve is disposed, flows, and the malfunction prevention valve assembly may open or close either the fluid supply path or the fluid discharge path based on a temperature of the reactor vessel.

[0021] The valve pressurization unit may further include a discharge tube for discharging the pressure of the fluid in the valve chamber, and the trip valve may be formed in a plurality of pieces, and the plurality of trip valves may include a first trip valve for opening and closing the fluid discharge path; and a second trip valve for opening and closing the discharge tube, and the malfunction prevention piston may be spaced apart from the vent hole so that the flow channel and the connecting path are connected when the second trip valve opens the discharge tube.

[0022] It may further include one or more opening / closing valves for opening / closing the main flow path, and the main flow path may include a first main flow path connected to the reactor vessel; and a second main flow path connected to the first main flow path and communicating with the interior of the containment vessel, and the one or more opening / closing valves may be arranged in at least one of the first main flow path and the second main flow path.

[0023] The one or more shut-off valves may be arranged in the first main passage so as to be positioned between the reactor vessel and the main valve assembly.

[0024] A reactor valve device according to a second embodiment of the present invention comprises: a main passage connected to a reactor vessel and a containment vessel accommodating the reactor vessel, the main passage providing a passage for allowing coolant of the containment vessel to flow into the interior of the reactor vessel; a main valve assembly opening and closing the main passage; a trip valve blocking discharge of fluid from the main valve assembly so that the main valve assembly closes the main passage, or allowing discharge of fluid from the main valve assembly so that the main valve assembly opens the main passage; and a malfunction prevention valve assembly opening and closing the main passage to prevent the main passage from being opened due to a malfunction of the trip valve, wherein the malfunction prevention valve assembly closes or opens the main passage based on a temperature of the reactor vessel.

[0025] The above malfunction prevention valve assembly may be connected to the main flow path and positioned between the reactor vessel and the main valve assembly.

[0026] The main flow path may include a first main flow path connected to the reactor vessel and a second main flow path connected to the first main flow path and communicating with the interior of the containment vessel, and the main valve assembly may be disposed in the first main flow path and may open and close the first main flow path, and the malfunction prevention valve assembly may be disposed in the second main flow path and may open and close the second main flow path based on the temperature of the reactor vessel.

[0027] A reactor valve device of one embodiment of the present invention can block coolant from flowing into the reactor vessel due to a malfunction of the main valve assembly.

[0028] Additionally, the reactor valve device can prevent the main valve assembly from opening the main flow path even if the trip valve is opened due to an operator's mistake.

[0029] In addition, the reactor valve device can prevent malfunction because the malfunction prevention valve assembly can be operated by the temperature of the reactor vessel to open and close the main flow path.

[0030] FIG. 1 is a drawing showing a malfunction prevention valve assembly of a reactor valve device according to a first embodiment of the present invention connected to a fluid supply path.

[0031] Figure 2 is a drawing showing the malfunction prevention valve assembly of the reactor valve device of Figure 1 connected to a fluid discharge path.

[0032] Figure 3 is a cross-sectional view showing the malfunction prevention valve assembly of the reactor valve device of Figure 1.

[0033] Figure 4 is a drawing showing the valve chamber of the malfunction prevention valve assembly of Figure 3 arranged inside the reactor vessel.

[0034] Figure 5 is a drawing showing the fluid flow of the reactor valve device when the reactor of Figure 1 is in the initial operation stage.

[0035] Figure 6 is a drawing showing the operation of the malfunction prevention valve assembly when the reactor of Figure 5 is in the initial operation stage.

[0036] Figure 7 is a drawing showing the flow of fluid in the reactor valve device when the reactor of Figure 1 is in normal operation.

[0037] Figure 8 is a drawing showing the operation of the malfunction prevention valve assembly when the reactor of Figure 7 is normal.

[0038] Figure 9 is a drawing showing the flow of fluid in the reactor valve device when the malfunction of Figure 1 occurs.

[0039] Figure 10 is a drawing showing the flow of fluid in the reactor valve device in the event of an accident in the reactor of Figure 1.

[0040] Figure 11 is a drawing showing the operation of the malfunction prevention valve assembly in the case of an accident in the reactor of Figure 10.

[0041] FIG. 12 is a drawing showing a malfunction prevention valve assembly of a reactor valve device according to a second embodiment of the present invention connected to a main flow path.

[0042] Figure 13 is a drawing showing the malfunction prevention valve assembly of Figure 12 connected to the second main flow path.

[0043] Fig. 14 is a drawing showing a bracket of a reactor valve device according to a third embodiment of the present invention.

[0044] Fig. 15 is a drawing showing a reactor valve device according to the fourth embodiment of the present invention in which a plurality of trip valves are formed.

[0045] FIG. 16 is a drawing showing a plurality of opening / closing valves arranged in a main path of a reactor valve device according to a fifth embodiment of the present invention.

[0046] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0047] 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.

[0048] Additionally, when it is said that a component is 'supported', 'connected' or 'in contact with' another component, it should be understood that it may be directly supported, connected or in contact with that other component, but there may also be other components present in between.

[0049] 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.

[0050] Additionally, please note that the terms "upper side," "lower side," and "side" in this specification are based on the illustrations in the drawings and may be expressed differently if the orientation of the subject changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the sizes of each component do not fully reflect the actual size.

[0051] 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.

[0052] 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.

[0053] Hereinafter, with reference to the drawings, a reactor valve device (1) according to a first embodiment of the present invention will be described.

[0054] Referring to FIGS. 1 to 3, a reactor valve device (1) is provided in a reactor (2) to remove residual heat from the reactor (2) in the event of an accident. The reactor (2) may include a reactor vessel (10) for accommodating a core and a containment vessel (20) for accommodating the reactor vessel (10). The interior of the containment vessel (20) may be in a vacuum state during the initial operation and normal operation of the reactor (2), and may accommodate coolant formed by condensation of steam released from the interior of the reactor vessel (10) during an accident of the reactor (2). The initial operation may be when the reactor (2) is first put into operation or before steam for driving a turbine, etc., is generated from the reactor (2). During normal operation, steam may be generated from the reactor (2).

[0055] Additionally, when steam is released from the inside of the reactor vessel (10), the internal pressure of the reactor vessel (10) may decrease, causing the temperature to drop. When the internal pressure of the reactor vessel (10) decreases, the internal pressure of the containment vessel (20) may increase. When the temperature of the reactor vessel (10) decreases, the reactor valve device (1) may be actuated to allow coolant to flow into the reactor vessel (10).

[0056] The reactor valve device (1) may include a main duct (100), a main valve assembly (200), a flow channel (300), a fluid supply device (400), a reset valve (500), a trip valve (600), and a malfunction prevention valve assembly (700).

[0057] The main channel (100) may be arranged inside the containment vessel (20) and connected to the reactor vessel (10) to provide a passage for flowing coolant into the reactor vessel (10). In other words, the main channel (100) may be connected to the reactor vessel (10) such that one side is connected to the interior of the reactor vessel (10) and the other side is connected to the interior of the containment vessel (20).

[0058] The main valve assembly (200) is connected to the main passage (100) so as to be placed inside the containment vessel (20) and can open and close the main passage (100). In other words, the main valve assembly (200) can open the main passage (100) so that the coolant of the containment vessel (20) can flow into the reactor vessel (10) in the event of an accident, and can close the main passage (100) in the event of normal operation. The main valve assembly (200) may include a valve housing (210), a main piston (220), a main spring (230), and a main support member (240).

[0059] The valve housing (210) may be connected to the main flow path (100) and may provide an internal space for accommodating the main piston (220). The internal space of the valve housing (210) may be communicated with a fluid supply flow path (310) of the flow channel (300), which will be described later. The valve housing (210) may receive fluid supplied from the fluid supply flow path (310) or discharge the fluid into the fluid supply flow path (310).

[0060] The main piston (220) may be arranged to be movable toward the main passage (100) or away from the main passage (100) within the valve housing (210). The lower end of the main piston (220) may be arranged within the main passage (100). During normal operation, the main piston (220) may be pressurized toward the main passage (100) by the fluid flowing into the valve housing (210) to close the main passage (100). In other words, the lower end of the main piston (220) may close the other side of the main passage (100) during normal operation. In addition, an orifice (221) may be formed in the main piston (220) to provide a passage for the fluid to flow. An orifice (221) may be formed in the main piston (220) to communicate the inside of the valve housing (210) with the inside of the main passage (100). In other words, the internal pressure of the valve housing (210) and the internal pressure of the main passage (100) may be communicated by the orifice (221). When the main piston (220) closes the other side of the main passage (100), the fluid may flow from the valve housing (210) to the main passage (100) or from the main passage (100) to the valve housing (210) through the orifice (221). In addition, in the event of an accident, the main piston (220) may move away from the main passage (100) by the fluid discharged from the valve housing (210) and the main spring (230), thereby opening the main passage (100). In other words, in the event of an accident, the fluid can be discharged from the valve housing (210) to depressurize the main spring (230). In addition, the lower portion of the depressurized main piston (220) can be separated from the other side of the main passage (100) in the event of an accident to open the other side of the main passage (100).

[0061] The main spring (230) is arranged inside the valve housing (210) and can provide restoring force to the main piston (220). During normal operation, the main spring (230) can be compressed by applying pressure to the main piston (220). In the event of an accident, the main spring (230) can provide restoring force to the main piston (220) and move the main piston (220) away from the main passage (100).

[0062] The main support member (240) can protrude from the inner surface of the valve housing (210) and support the main spring (230).

[0063] The flow channel (300) is connected to the main valve assembly (200) and the fluid supply (400), and can provide a passage for fluid to flow toward the main valve assembly (200) or for discharging fluid from the main valve assembly (200) to the outside. The flow channel (300) can include a fluid supply passage (310) and a fluid discharge passage (320).

[0064] The fluid supply passage (310) can be connected to the fluid supplier (400) and the main valve assembly (200) to provide a passage through which the fluid flows. The fluid supply passage (310) can pass through the valve housing (210) so as to be in communication with the internal space of the valve housing (210). By the fluid supply passage (310), when the reset valve (500) is opened and the trip valve (600) is closed during initial operation, the fluid can flow to the main valve assembly (200) and close the main passage (100). During normal operation, the reset valve (500) can be closed. In addition, when the trip valve (600) is opened during an accident, the fluid can be discharged from the main valve assembly (200). The fluid supply passage (310) can penetrate the containment vessel (20) such that a portion thereof is disposed inside the containment vessel (20) and another portion thereof is disposed outside the containment vessel (20).

[0065] The fluid discharge passage (320) is connected to the fluid supply passage (310) and can provide a passage through which the fluid discharged from the fluid supply passage (310) flows. In the event of an accident, the fluid supply passage (310) can discharge the fluid to the outside when the trip valve (600) is opened. The fluid discharge passage (320) can penetrate the containment vessel (20) such that a portion thereof is disposed inside the containment vessel (20) and the other portion thereof is disposed outside the containment vessel (20).

[0066] The fluid supply device (400) may be a device for supplying fluid. The fluid supply device (400) may supply fluid to the fluid supply path (310). The fluid supply device (400) may be placed inside the containment vessel (20).

[0067] The reset valve (500) is arranged in the fluid supply path (310) and can open and close the fluid supply path (310). The reset valve (500) opens the fluid supply path (310) so that the fluid in the fluid supplier (400) can flow through the fluid supply path (310) to the valve housing (210). The reset valve (500) closes the fluid supply path (310) so that the fluid in the fluid supplier (400) can be prevented from flowing to the valve housing (210). The reset valve (500) can be opened during the initial operation and normal operation of the reactor (2) and can be closed in the event of an accident. The reset valve (500) can be arranged on the outside of the containment vessel (20).

[0068] The trip valve (600) can open and close the fluid discharge passage (320) to allow fluid to be discharged to the outside from the main valve assembly (200). During normal operation, the trip valve (600) can close the fluid discharge passage (320) to block fluid from being discharged from the main passage (100). In addition, in the event of an accident, the trip valve (600) can open the fluid discharge passage (320) to allow fluid in the main passage (100) to be discharged to the outside. In other words, the trip valve (600) can block fluid from being discharged from the main valve assembly (200) so that the main valve assembly (200) closes the main passage (100), or can allow fluid to be discharged from the main valve assembly (200) so that the main valve assembly (200) opens the main passage (100).

[0069] The malfunction prevention valve assembly (700) can close the flow channel (300) to prevent the main flow path (100) from opening due to a malfunction of the trip valve (600). The malfunction prevention valve assembly (700) can close the flow channel (300) based on the temperature of the reactor vessel (10) to prevent the fluid of the main valve assembly (200) from being discharged to the outside due to a malfunction of the trip valve (600). In addition, the malfunction prevention valve assembly (700) can open the flow channel (300) based on the temperature of the reactor vessel (10) to allow the fluid of the main valve assembly (200) to be discharged to the outside by the trip valve (600). The temperature of the reactor vessel (10) may rise during normal operation and be formed to be higher than a predetermined reference temperature. Additionally, the temperature of the reactor vessel (10) may drop and become lower than the reference temperature in the event of an accident.

[0070] The malfunction prevention valve assembly (700) is connected to the fluid supply path (310) to open and close the fluid supply path (310), or is connected to the fluid discharge path (320) to open and close the fluid discharge path (320). Meanwhile, although the drawing illustrates that the malfunction prevention valve assembly (700) operates while connected to the fluid discharge path (320), it can operate in the same manner even when connected to the fluid supply path (310).

[0071] The malfunction prevention valve assembly (700) may include a cylinder (710), a malfunction prevention piston (720), a valve pressurizing portion (730), a bellows (740), and a cylinder spring (750).

[0072] The cylinder (710) can movably support the malfunction prevention piston (720). The cylinder (710) can be formed to extend vertically inside the containment vessel (20). The cylinder (710) can include a cylinder body (711) and a protrusion (712).

[0073] The cylinder body (711) can provide a space in which a malfunction prevention piston (720) can be accommodated therein. In addition, a vent hole (711a) and a connection port (711b) can be formed in the cylinder body (711).

[0074] A vent hole (711a) may be arranged on the upper side of the cylinder body (711). The fluid inside the cylinder body (711) may be communicated with the external containment vessel (20) through the vent hole (711a). In addition, the vent hole (711a) may be communicated with the inside of the containment vessel (20), so that the internal pressure of the containment vessel (20) and the internal pressure of the cylinder body (711) may be communicated.

[0075] The connecting port (711b) may be connected to the flow channel (300). In other words, the connecting port (711b) may be connected to the fluid supply channel (310) or the fluid discharge channel (320). For example, the connecting port (711b) may be formed on both sides of the cylinder body (711). In addition, the connecting port (711b) may be connected to the connecting port (721a) of the malfunction prevention piston (720), which will be described later, in the event of an accident.

[0076] The protrusion (712) can protrude from the inner surface of the cylinder body (711) and support the bellows (740). This protrusion (712) can support the bellows (740).

[0077] The malfunction prevention piston (720) can reciprocate along the length direction of the cylinder (710) within the cylinder (710) to open and close the flow channel (300). In other words, the malfunction prevention piston (720) can move up and down within the cylinder body (711). When the temperature of the reactor vessel (10) is higher than the reference temperature, the malfunction prevention piston (720) can be moved within the cylinder (710) by the fluid of the valve pressurization portion (730) to close the flow channel (300). In other words, the malfunction prevention piston (720) can be moved toward the vent hole (711a) of the cylinder body (711) by the pressure of the fluid of the rising valve pressurization portion (730).

[0078] In addition, the malfunction prevention piston (720) can be moved inside the cylinder (710) by the fluid of the valve pressurizing portion (730) when the temperature of the reactor vessel (10) is lower than the reference temperature, thereby opening the flow channel (300). In other words, the malfunction prevention piston (720) can be moved away from the vent hole (711a) of the cylinder body (711) by the pressure of the fluid of the decreasing valve pressurizing portion (730).

[0079] This malfunction prevention piston (720) may include a piston head (721), a rod (722), and a piston plate (723).

[0080] The piston head (721) can divide the internal space of the cylinder body (711) into a first space (S1) and a second space (S2). In addition, a connecting passage (721a) through which a fluid can flow can be formed in the piston head (721). The piston head (721) can be pressurized upward by the fluid of the valve pressurizing portion (730) so that, during normal operation, the connecting passage (721a) and the flow channel (300) are placed at a position where they are blocked. In other words, the connecting passage (721a) can be blocked from the fluid discharge passage (320) or the fluid supply passage (310) during normal operation. In addition, in the event of an accident, the piston head (721) can move to a position where the fluid pressure of the valve pressurizing portion (730) is reduced, thereby lowering and communicating with the connecting passage (721a) and the flow channel (300). In other words, the connecting passage (721a) can be connected to the fluid discharge passage (320) or the fluid supply passage (310) in the event of an accident.

[0081] Additionally, a head hole (721b) extending in the vertical direction may be formed in the piston head (721). The head hole (721b) connects the upper space and the lower space of the piston head (721).

[0082] The rod (722) may extend upward from the piston head (721). In other words, the rod (722) may be positioned in the first space (S1). In addition, the rod (722) may support the piston plate (723).

[0083] The piston plate (723) is arranged on the upper end of the rod (722) to divide the first space (S1) into a plurality of spaces. In addition, the piston plate (723) can contract or expand the bellows (740) by the movement of the piston head (721). In addition, a through hole (723a) that connects a plurality of first spaces (S1) may be formed in the piston plate (723).

[0084] The valve pressurization unit (730) is supported on the reactor vessel and can accommodate a fluid whose pressure increases or decreases depending on the temperature of the reactor vessel. The malfunction prevention piston (720) can be raised or lowered within the cylinder body (711) by the fluid in the valve pressurization unit (730). The valve pressurization unit (730) can include a valve chamber (731) and a valve tube (732).

[0085] Referring further to FIG. 4, a valve chamber (731) may be supported on the reactor vessel (10) and provide a space for receiving a fluid. The valve chamber (731) may be disposed on the outer surface of the reactor vessel (10) or on the inner surface of the reactor vessel (10). The pressure of the fluid in the valve chamber (731) may vary depending on the temperature of the reactor vessel (10).

[0086] The valve tube (732) can transmit the pressure of the fluid in the valve chamber (731) to the internal space of the cylinder body (711). One side of the valve tube (732) can be connected to the valve chamber (731), and the other side, which is the opposite side, can be communicated with the interior of the cylinder body (711). In addition, the valve tube (732) can be connected to the valve chamber (731) and the cylinder body (711) by penetrating the reactor vessel (10).

[0087] The bellows (740) are formed in multiple pieces and can be contracted or expanded by the movement of the malfunction prevention piston (720). The multiple bellows (740) can include a first bellows (741) and a second bellows (742).

[0088] The first bellows (741) is arranged in the first space (S1) and can be extended or contracted. The first bellows (741) can be arranged in the first space (S1) of the cylinder body (711) so that the upper end is supported by the piston plate (723) and the lower end is supported by the protrusion (712). The first bellows (741) can be extended when the malfunction prevention piston (720) moves toward the vent hole (711a) and contracted when it moves away from the vent hole (711a).

[0089] The second bellows (742) is arranged in the second space (S2) and can be extended or contracted. The second bellows (742) can be arranged in the second space (S2) of the cylinder body (711) so that the upper end is supported by the piston head (721) and the lower end is supported by the lower side of the cylinder body (711). The second bellows (742) can be extended when the malfunction prevention piston (720) moves toward the vent hole (711a) and contracted when it moves away from the vent hole (711a).

[0090] The cylinder spring (750) can provide restoring force to the malfunction-prevention piston (720). The cylinder spring (750) can be arranged in the first space (S1) of the cylinder body (711) and connected to the piston plate (723). The cylinder spring (750) is pressurized by the malfunction-prevention piston (720) during normal operation, and can provide restoring force to the malfunction-prevention piston (720) during an accident.

[0091] Hereinafter, the operation and effect of the reactor valve device (1) according to the first embodiment of the present invention will be described.

[0092] Referring further to FIGS. 5 and 6, in the reactor valve device (1) according to the first embodiment of the present invention, at the initial stage of operation of the reactor (2), the reset valve (500) can open the fluid supply path (310), and the trip valve (600) can close the fluid discharge path (320). The main valve assembly (200) can close the main path (100) by the reset valve (500). In other words, at the initial stage of operation, the fluid of the fluid supplier (400) can flow into the valve housing (210) to pressurize the main piston (220) so that the main piston (220) closes the main path (100). In addition, the malfunction prevention valve assembly (700) can open the flow channel (300) so that the fluid of the fluid supply path (310) flows into the main valve assembly (200). In other words, the temperature of the reactor vessel (10) is formed lower than the reference temperature at the beginning of operation, so that the malfunction prevention piston (720) can be placed at a position where the connecting passage (721a) and the connecting port (711b) are connected.

[0093] Referring further to FIGS. 7 and 8, when the reactor (2) is in normal operation, the malfunction prevention valve assembly (700) can close the flow channel (300) to prevent fluid from being discharged from the valve housing (210). In other words, when the temperature of the reactor vessel (10) is formed higher than the reference temperature during normal operation, the malfunction prevention piston (720) can be positioned at a position where the connection path (721a) and the connection port (711b) are blocked by the pressure of the fluid in the valve chamber (731). The malfunction prevention valve assembly (700) can close the fluid supply path (310) or the fluid discharge path (320) during normal operation.

[0094] Referring further to Fig. 9, when the reactor (2) is operating normally, but the trip valve (600) malfunctions by opening the fluid discharge path (320), the main valve assembly (200) can continuously close the main path (100) by the malfunction prevention valve assembly (700). In other words, when a malfunction occurs, the temperature of the reactor vessel (10) is formed to be higher than the reference temperature, and the malfunction prevention piston (720) can be continuously positioned in a position where the connection path (721a) and the connection port (711b) are blocked by the pressure of the fluid in the valve chamber (731). Since the fluid supply path (310) or the fluid discharge path (320) can be closed by the malfunction prevention valve assembly (700) and the fluid in the main path (100) can be prevented from being discharged, opening of the main path (100) due to malfunction can be prevented.

[0095] Referring further to FIGS. 10 and 11, when the reactor (2) experiences an accident, the malfunction prevention valve assembly (700) and the trip valve (600) can open the flow channel (300), so that the main valve assembly (200) can open the main passage (100). In other words, when the temperature of the reactor vessel (10) is formed below the reference temperature, the malfunction prevention piston (720) can be positioned at a position where the connection passage (721a) and the connection port (711b) are in communication with each other due to the pressure of the fluid in the valve chamber (731). In addition, by opening the trip valve (600), the fluid can be discharged from the valve housing (210) and discharged to the outside, so that the main piston (220) can open the main passage (100). When this main passage (100) is opened, the coolant of the containment vessel (20) can flow into the interior of the reactor vessel (10). Therefore, in the event of an accident, the main passage (100) of the main valve assembly (200) can be opened to remove residual heat from the core of the reactor (2).

[0096] The reactor valve device (1) can block coolant from flowing into the reactor vessel (10) due to a malfunction of the main valve assembly (200).

[0097] In addition, the reactor valve device (1) can prevent the main valve assembly (200) from opening the main flow path (100) even if the trip valve (600) is opened due to an operator's mistake.

[0098] Hereinafter, a reactor valve device (1) according to a second embodiment of the present invention will be described. The malfunction prevention valve assembly (700) is different in that it is arranged in the main channel (100) and can open and close the main channel (100). This difference will be mainly described.

[0099] Referring to FIG. 12, as a first example, a malfunction prevention valve assembly (700) may be arranged in the main passage (100) so as to be positioned between the reactor vessel (10) and the main valve assembly (200). The malfunction prevention valve assembly (700) may close the main passage (100) based on the temperature of the reactor vessel (10) during normal operation and during malfunction. In addition, the malfunction prevention valve assembly (700) may open the main passage (100) together with the main valve assembly (200) based on the temperature of the reactor vessel (10) during an accident. The connection port (711b) of the cylinder body (711) of the malfunction prevention valve assembly (700) may be connected to the main passage (100). In addition, the piston head (721) can be moved so that the connecting passage (721a) and the main passage (100) are blocked by an increase in the fluid pressure of the valve chamber (731) during normal operation and malfunction. In addition, the piston head (721) can be moved so that the connecting passage (721a) and the main passage (100) are connected by a decrease in the fluid pressure of the valve chamber (731) during an accident. When the connecting passage (721a) and the main passage (100) are connected, the coolant can flow into the interior of the reactor vessel (10).

[0100] Referring further to FIG. 13, as a second example, the main euro (100) may include a first main euro (110) and a second main euro (120).

[0101] The first main channel (110) can be connected to the reactor vessel (10). A main valve assembly (200) is arranged in the first main channel (110), so that the first main channel (110) can be opened and closed by the main valve assembly (200).

[0102] The second main channel (120) is connected to the first main channel (110) and can be communicated with the interior of the containment vessel (20). In other words, the second main channel (120) can have one side communicated with the first main channel (110) and the other side communicated with the interior of the containment vessel (20). A malfunction prevention valve assembly (700) is arranged in the second main channel (120) and can be opened and closed by the malfunction prevention valve assembly (700). The malfunction prevention valve assembly (700) arranged in the second main channel (120) can close the second main channel (120) by the pressure of the fluid in the valve chamber (731) during normal operation and during malfunction. In addition, the malfunction prevention valve assembly (700) can open the second main passage (120) when the fluid pressure in the valve chamber (731) decreases in the event of an accident. In other words, in the event of an accident, the connecting passage (721a) can be connected to the second main passage (120) through the connecting port (711b). When the connecting passage (721a) and the second main passage (120) are connected, the coolant can flow into the interior of the reactor vessel (10) through the first main passage (110) and the second main passage (120).

[0103] Hereinafter, the operation and effect of the reactor valve device (1) according to the second embodiment of the present invention will be described.

[0104] The malfunction prevention valve assembly (700) of the reactor valve device (1) according to the second embodiment of the present invention can directly open and close the main flow path (100), so that in the event of a malfunction, the coolant can be prevented from flowing into the interior of the reactor vessel (10).

[0105] In addition, the malfunction prevention valve assembly (700) is connected to the main oil path (100) and blocks the fluid of the main valve assembly (200) from being discharged to the outside in the event of a malfunction.

[0106] Hereinafter, a reactor valve device (1) according to a third embodiment of the present invention will be described. The third embodiment of the present invention differs in that the malfunction prevention valve assembly (700) further includes a bracket (760), and this difference will be primarily described.

[0107] Referring to FIG. 14, the bracket (760) is supported on the reactor vessel (10) and can transfer heat of the reactor vessel (10) to the valve chamber (731). In other words, the bracket (760) can be located between the reactor vessel (10) and the valve chamber (731).

[0108] Hereinafter, the operation and effect according to the third embodiment of the present invention will be described.

[0109] Since the heat of the reactor vessel (10) can be transferred to the valve chamber (731) by the bracket (760) of the reactor valve device (1) according to the third embodiment of the present invention, the responsiveness of the malfunction-prevention valve assembly (700) can be adjusted. In other words, since the timing at which the heat of the reactor vessel (10) is transferred to the valve chamber (731) can be changed depending on the size of the bracket (760), the timing at which the malfunction-prevention piston (720) moves can also be changed. For example, when the reactor (2) changes from initial operation to normal operation, if the heat of the reactor vessel (10) reaches the valve chamber (731) after the first time by the bracket (760) formed with the first size, the malfunction-prevention piston (720) can also move after the first time. As another example, when the reactor (2) changes from initial operation to normal operation, if heat reaches the valve chamber (731) after a second time longer than the first time by the bracket (760) formed with a second size larger than the first size, the malfunction prevention piston (720) may also be moved after the second time.

[0110] Hereinafter, a reactor valve device (1) according to a fourth embodiment of the present invention will be described. In describing the fourth embodiment, there are differences in that the trip valve (600) is formed in multiple pieces and the valve pressurization portion (730) further includes a discharge tube (733). These differences will be primarily described.

[0111] Referring further to FIG. 15, the plurality of trip valves (600) may include a first trip valve (610) and a second trip valve (620), which are the trip valves (600) described in the previous embodiment.

[0112] The second trip valve (620) can open and close the discharge tube (733). When the discharge tube (733) is opened by the second trip valve (620), the pressure of the fluid in the valve chamber (731) is reduced, so that the malfunction prevention piston (720) can be positioned at a position where the connecting passage (721a) and the flow channel (300) are in communication. In addition, the second trip valve (620) can be positioned on the outside of the containment vessel (20).

[0113] The discharge tube (733) may be connected to the valve tube (732) to provide a passage for discharging the pressure of the fluid in the valve chamber (731) to the outside. In addition, the discharge tube (733) may pass through the containment vessel (20) and be connected to the second trip valve (620).

[0114] Hereinafter, the operation and effect of the reactor valve device (1) according to the fourth embodiment of the present invention will be described.

[0115] The second trip valve (620) of the reactor valve device (1) according to the fourth embodiment of the present invention can directly reduce the pressure of the valve chamber (731) by opening the discharge tube (733), so that the malfunction prevention valve assembly (700) can quickly open the flow channel (300).

[0116] Hereinafter, a reactor valve device (1) according to a fifth embodiment of the present invention will be described. In describing the fifth embodiment, the reactor valve device (1) differs in that it further includes an on-off valve (800), and this difference will be primarily described.

[0117] Referring further to FIG. 16, the on-off valve (800) of the reactor valve device (1) according to the fifth embodiment of the present invention is provided in the main passage (100) and can open and close the main passage (100) together with the main valve assembly (200). In addition, the on-off valve (800) may be formed in one or more. The one or more on-off valves (800) may be arranged in one or more of the first main passage (110) and the second main passage (120). The one or more on-off valves (800) may include a first on-off valve (810) and a second on-off valve (820).

[0118] The first shut-off valve (810) may be arranged in the first main passage (110). The first shut-off valve (810) may be arranged in the first main passage (110) so as to be located between the reactor vessel (10) and the main valve assembly (200). The second shut-off valve (820) may be arranged in the second main passage (120). The first shut-off valve (810) and the second shut-off valve (820) may be configured to only allow the flow of coolant from the containment vessel (20) to the reactor vessel (10). In other words, the first shut-off valve (810) and the second shut-off valve (810) may be configured so as not to be opened by being pressurized by the fluid discharged from the reactor vessel (10).

[0119] Hereinafter, the operation and effect of the reactor valve device (1) according to the fifth embodiment of the present invention will be described. The first switching valve (810) and the second switching valve (820) differ in that they are installed in the first main channel (110) and the second main channel (120), respectively, but their functions are the same. Therefore, from here on, the operation and effect will be described based on the first switching valve (810).

[0120] The first shut-off valve (810) prevents the coolant of the reactor (2) from being released into the containment vessel (20) even if the trip valve (600) opens due to an operator's malfunction during normal operation and the main piston (220) opens the main passage (100). In addition, in the event of an accident, the trip valve (600) may open and the main passage (100) may be opened, and at this time, the first shut-off valve (810) may allow the condensate of the containment vessel (20) to be recirculated into the reactor (2) through the main passage (100), thereby achieving emergency core cooling. Therefore, the shut-off valve (800) may be provided as an auxiliary means of the malfunction prevention valve assembly (700).

[0121] 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 main passage connected to a reactor vessel and a containment vessel accommodating the reactor vessel, and providing a passage for allowing coolant of the containment vessel to flow into the interior of the reactor vessel; A main valve assembly that opens and closes the main oil passage; A trip valve that blocks the discharge of fluid from the main valve assembly so that the main valve assembly closes the main flow path, or allows the discharge of fluid from the main valve assembly so that the main valve assembly opens the main flow path; A flow channel connected to the main valve assembly and the trip valve to provide a passage through which the fluid flows; and It includes a malfunction prevention valve assembly that opens and closes the flow channel to prevent the main flow path from being opened due to malfunction of the trip valve. The above malfunction prevention valve assembly, Based on the temperature of the reactor vessel, the flow channel is closed to prevent the fluid of the main valve assembly from being discharged to the outside due to a malfunction of the trip valve, or the flow channel is opened to allow the fluid of the main valve assembly to be discharged to the outside by the trip valve. Reactor valve device.

2. In paragraph 1, The above malfunction prevention valve assembly, A cylinder connected to the flow channel so as to be placed inside the containment vessel; A malfunction prevention piston that reciprocates along the length of the cylinder inside the cylinder to open and close the flow channel; and It includes a valve pressurization unit that is supported on the reactor vessel and receives a fluid whose pressure is increased or decreased by the temperature of the reactor vessel, The above malfunction prevention piston is, When the above temperature is higher than a predetermined reference temperature, the fluid moves inside the cylinder by the pressure and closes the flow channel. When the temperature is lower than the reference temperature, the fluid moves inside the cylinder by the pressure of the fluid to open the flow channel. Reactor valve device.

3. In paragraph 2, The above cylinder, It includes a cylinder body including a space in which the above malfunction prevention piston is accommodated, The above cylinder body A vent hole communicating with the interior of the containment vessel; and a connection port communicating with the flow channel, The above malfunction prevention piston includes a connecting passage that provides a passage through which the fluid flows, The above malfunction prevention piston is, When the above temperature is higher than a predetermined reference temperature, the fluid is pressurized toward the vent hole by the pressure of the fluid, When the above temperature is lower than the reference temperature, the flow channel and the connecting passage are separated from the vent hole so as to be connected. Reactor valve device.

4. In paragraph 3, The above malfunction prevention valve assembly, A cylinder spring that contracts when the malfunction-prevention piston moves toward the vent hole and provides a restoring force to the malfunction-prevention piston when the malfunction-prevention piston moves away from the vent hole; and Further comprising one or more bellows that contract or expand by the movement of the above malfunction prevention piston. Reactor valve device.

5. In paragraph 4, The internal space of the above cylinder body is divided into a first space and a second space by the malfunction prevention piston, The above bellows are formed in multiple pieces, Any one of the plurality of bellows is arranged in the first space, Another one of the plurality of bellows is placed in the second space, The above cylinder spring is arranged in the first space, and the vent hole is connected to the first space. Reactor valve device.

6. In paragraph 3, The above malfunction prevention piston is, A piston head in which the above connecting passage is formed; a rod extending from the piston head toward the vent hole; and Includes a piston plate placed at the end of the above load, The above piston plate includes a through hole, Reactor valve device.

7. In paragraph 3, The above valve pressurization part, A valve chamber supported on the reactor vessel and providing a space for receiving the fluid; and A valve tube having one side connected to the valve chamber and the other side opposite to the one side communicating with the internal space of the cylinder body, and providing a passage for transmitting the pressure of the fluid to the internal space of the cylinder body. Reactor valve device.

8. In paragraph 7, The above valve chamber is arranged on the outer surface of the reactor vessel, Reactor valve device.

9. In paragraph 7, The above valve chamber is arranged on the inner surface of the reactor vessel, The above valve tube penetrates the reactor vessel, Reactor valve device.

10. In paragraph 7, The above malfunction prevention valve assembly, Further comprising a bracket for transferring heat of the reactor vessel to the valve chamber. Reactor valve device.

11. In paragraph 7, Further comprising a reset valve operable to allow or block the supply of the fluid to the main valve assembly; The above flow channel is, The main valve assembly and the fluid supply path that provides the passage through which the fluid flows and in which the reset valve is arranged; and Includes a fluid discharge path that provides a passage through which the fluid discharged from the main valve assembly, which is connected to the fluid supply path and in which the trip valve is arranged, flows; The above malfunction prevention valve assembly opens and closes one of the fluid supply path and the fluid discharge path based on the temperature of the reactor vessel. Reactor valve device.

12. In paragraph 11, The above valve pressurization part, Further comprising a discharge tube for discharging the pressure of the fluid in the above valve chamber, The above trip valve is formed in multiple pieces, Multiple trip valves A first trip valve that opens and closes the fluid discharge path; and A second trip valve for opening and closing the above discharge tube is included, The above malfunction prevention piston When the second trip valve opens the discharge tube, the flow channel and the connecting passage are separated from the vent hole so as to be in communication. Reactor valve device.

13. In paragraph 1, It further includes one or more opening / closing valves for opening / closing the main flow, The above main euro is, Connected to the reactor vessel and a first main flow; and A second main passage connected to the first main passage and communicating with the interior of the containment vessel is included. The above one or more opening / closing valves are arranged in at least one of the first main flow path and the second main flow path, Reactor valve device.

14. In paragraph 13, One or more of the above opening / closing valves It is arranged in the first main passage so as to be located between the reactor vessel and the main valve assembly. Reactor valve device.

15. A main passage connected to a reactor vessel and a containment vessel accommodating the reactor vessel, and providing a passage for allowing coolant of the containment vessel to flow into the interior of the reactor vessel; A main valve assembly that opens and closes the main oil passage; A trip valve that blocks the discharge of fluid from the main valve assembly so that the main valve assembly closes the main flow path, or allows the discharge of fluid from the main valve assembly so that the main valve assembly opens the main flow path; and In order to prevent the main flow path from being opened due to a malfunction of the trip valve, a malfunction prevention valve assembly for opening and closing the main flow path is included. The above malfunction prevention valve assembly, Closing or opening the main flow path based on the temperature of the reactor vessel; Reactor valve device.

16. In paragraph 15, The above malfunction prevention valve assembly, Connected to the main oil and located between the reactor vessel and the main valve assembly, Reactor valve device.

17. In paragraph 16, The above main euro is Connected to the reactor vessel and a first main flow; and A second main passage connected to the first main passage and communicating with the interior of the containment vessel is included. The above main valve assembly is arranged in the first main flow path and opens and closes the first main flow path, The above malfunction prevention valve assembly is arranged in the second main flow path and opens and closes the second main flow path based on the temperature of the reactor vessel. Reactor valve device.

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