Nuclear reactor valve device

Abstract

This nuclear reactor valve device comprises: a main flow path that is connected to a reactor vessel and a containment vessel for accommodating the reactor vessel and provides a passage through which coolant of the containment vessel flows into the reactor vessel; a main valve assembly that opens and closes the main flow path; a trip valve that blocks fluid discharge from the main valve assembly so that the main valve assembly closes the main flow path, or allows fluid discharge 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 for fluid flow; and 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.

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: 2022.11.01 ~ 2025.10.31) 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. A nuclear reactor comprises a reactor vessel housing the core, a containment vessel surrounding the reactor vessel, a relief valve to relieve internal pressure within 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 1) 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 one aspect 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 for opening and closing the main passage; a trip valve for blocking fluid from being discharged from the main valve assembly so that the main valve assembly closes the main passage, or allowing fluid to be discharged 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 to provide a passage for 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 blocks the flow channel based on the pressure inside the containment vessel to prevent 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 disposed inside the containment vessel and connected to the flow channel; a cylinder pressurizing portion configured to provide a pressurizing force to the inside of the cylinder; a malfunction prevention piston reciprocating along the longitudinal direction of the cylinder inside the cylinder to open and close the flow channel; and a cylinder spring for providing a restoring force to the malfunction prevention piston, wherein the malfunction prevention piston can open and close the flow channel based on the pressure inside the containment vessel, the pressurizing force of the cylinder pressurizing portion, and the restoring force of the cylinder spring.

[0012] The above malfunction prevention piston can move to close the flow channel when the pressure of the cylinder pressurizing portion is greater than the sum of the internal pressure of the containment vessel and the restoring force of the cylinder spring.

[0013] The above malfunction prevention piston can move to open the flow channel when the pressing force of the cylinder pressurizing portion is less than the sum of the pressure of the containment vessel and the restoring force of the cylinder spring, or when the sum of the pressure of the containment vessel and the restoring force of the cylinder spring is greater than the pressing force of the cylinder pressurizing portion.

[0014] The cylinder includes a cylinder body including an internal space in which the malfunction-prevention piston is accommodated, and the cylinder body has a vent hole formed on one side and communicating with the cylinder pressurization portion; a communication hole formed on the other side opposite the one side and communicating with the containment vessel; and a connection port communicating with the flow channel, and a connection path providing a passage through which the fluid flows is formed in the malfunction-prevention piston, and the malfunction-prevention piston can be moved toward the vent hole so that the connection path and the connection port are in communication, or moved toward the communication hole so that the connection path and the connection port are blocked.

[0015] The above-mentioned communication hole may be positioned above the above-mentioned vent hole.

[0016] The cylinder may further include a protrusion protruding from the inside of the cylinder body, and the malfunction prevention valve assembly may further include one or more bellows supported on the protrusion so as to be contracted or extended by movement of the malfunction prevention piston.

[0017] The above cylinder spring may be positioned between the malfunction prevention piston and the communication hole, and the bellows may be positioned between the cylinder spring and the vent hole.

[0018] 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, another of the plurality of bellows is arranged in the second space, and the cylinder spring can be arranged in the second space.

[0019] The above malfunction prevention piston includes a piston head having the connecting passage formed in the cylinder body; a rod extending from the piston head toward the communication hole; and a piston plate disposed at an end of the rod, wherein a through hole may be formed in the piston plate.

[0020] The above malfunction prevention piston may further include a plurality of sealing members arranged on the piston head so as to be positioned on the upper and lower sides of the connecting passage.

[0021] The cylinder pressurization unit includes a chamber disposed outside the containment vessel and containing a fluid; a tank accommodating the chamber; a pressurization passage penetrating the containment vessel and connected to the chamber and the cylinder, providing a passage for allowing the pressure of the fluid in the chamber to flow to the cylinder; and a pressurization valve disposed in the pressurization passage so as to be disposed outside the containment vessel and opened and closed to supplement the pressure of the chamber.

[0022] The above pressurizing valve may be arranged in one or more of the pressurizing passages so as to contact the outer surface of the containment vessel.

[0023] The above-mentioned communication hole is positioned lower than the above-mentioned vent hole, and the cylinder further includes a containment passage having one side communicated with the communication hole and the other side opposite the one side communicated with the interior of the containment vessel, and the other side of the containment passage can be opened downward.

[0024] The main valve assembly further includes a reset valve that operates to allow or block the supply of the fluid, and the flow channel includes a fluid supply path that provides a passage through which the fluid flows with the main valve assembly and in which the reset valve is disposed; 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 in which the trip valve is disposed flows, and the malfunction prevention valve assembly can be disposed in either of the fluid supply path and the fluid discharge path.

[0025] A reactor valve device according to one aspect 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 for blocking discharge of fluid from the main valve assembly so that the main valve assembly closes the main passage, or for 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 the main passage or opens the main passage based on a pressure inside the containment vessel.

[0026] The above malfunction prevention valve assembly can be connected to the main flow path so as to be positioned between the reactor vessel and the main valve assembly.

[0027] The main flow path is connected to the reactor vessel and includes a first main flow path; 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 is disposed in the first main flow path to open and close the first main flow path, and the malfunction prevention valve assembly is disposed in the second main flow path to open and close the second main flow path.

[0028] 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.

[0029] Additionally, the reactor valve 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.

[0030] Additionally, the fluid can be prevented from leaking out by the bellows and sealing member.

[0031] Figure 1 illustrates a reactor valve device according to a first embodiment of the present invention.

[0032] Figure 2 illustrates a malfunction prevention valve assembly of the reactor valve device of Figure 1.

[0033] Figure 3 illustrates the reactor valve device of Figure 1 connected to a fluid supply path.

[0034] Figure 4 is a drawing showing the reactor valve device of Figure 1 closing the main flow path during normal reactor operation.

[0035] Figure 5 is a drawing showing the reactor valve device of Figure 1 closing the main flow path even when it malfunctions.

[0036] Figure 6a is a drawing showing the malfunction prevention valve assembly of Figure 2 closing the flow channel when malfunction occurs.

[0037] Figure 6b is a drawing showing a flow channel being closed by a modified malfunction prevention valve assembly.

[0038] Figure 7 is a drawing showing the malfunction prevention valve assembly of Figure 2 with the flow channel opened in the event of an accident.

[0039] Figure 8 is a drawing showing the reactor valve device of Figure 1 with the main flow path open in the event of an accident.

[0040] FIG. 9 is a drawing showing a malfunction prevention valve assembly of a reactor valve device according to a second embodiment of the present invention arranged in a main channel.

[0041] FIG. 10 is a drawing showing a malfunction prevention valve assembly of a reactor valve device according to a second embodiment of the present invention arranged in a second main channel.

[0042] FIG. 11 is a drawing showing a plurality of bellows arranged in a first space of a cylinder body according to a third embodiment of the present invention.

[0043] FIG. 12 is a drawing showing a plurality of bellows according to a third embodiment of the present invention, overlapped and arranged in a first space of a cylinder body.

[0044] FIG. 13 is a drawing showing a plurality of bellows according to a third embodiment of the present invention arranged in a first space and a second space, respectively.

[0045] FIG. 14 is a drawing showing a state in which a cylinder of a reactor valve device according to a fourth embodiment of the present invention is arranged so that one side is positioned at the bottom and the other side is positioned at the top.

[0046] FIG. 15 is a drawing showing a cylinder spring of a reactor valve device according to a fifth embodiment of the present invention arranged in a first space.

[0047] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Additionally, please note that the terms "top," "bottom," 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.

[0052] 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.

[0053] 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.

[0054] Hereinafter, with reference to the drawings, a reactor valve device (1) according to a first embodiment of the present invention will be described.

[0055] 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 when the reactor (2) is operating normally, and may accommodate coolant formed by condensation of steam released from the interior of the reactor vessel (10) in the event of an accident in the reactor (2). In addition, when steam is released from the interior of the reactor vessel (10), the pressure of the reactor vessel (10) may decrease, and the internal pressure of the containment vessel (20) may increase. When the internal pressure of the containment vessel (20) increases, the reactor valve device (1) may be driven 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 passage (100) may be arranged inside the containment vessel (20) and connected to the reactor vessel (10) to provide a passage for the coolant to flow into the reactor vessel (10). In other words, the main passage (100) may be connected to the reactor vessel (10) such that one side is in communication with the interior of the reactor vessel (10) and the other side is in communication with the interior of the containment vessel (20).

[0058] The main valve assembly (200) is arranged inside the containment vessel (20) and is connected to the main passage (100) to 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) to 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) can 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) can be arranged within the main passage (100). During normal operation, the main piston (220) can 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, during normal operation, the lower end of the main piston (220) can close the other side of the main passage (100).

[0061] In addition, an orifice (221) may be formed in the main piston (220) to provide a passage for the fluid to flow. The orifice (221) may be formed in the main piston (220) to communicate the inside of the valve housing (210) and 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).

[0062] In addition, in the event of an accident, the main piston (220) can move away from the main passage (100) by the fluid discharged from the valve housing (210) and the main spring (230) to open 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 part of the depressurized main piston (220) can be depressurized from the other side of the main passage (100) to open the other side of the main passage (100) in the event of an accident.

[0063] 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 when the main piston (220) is pressurized by the fluid. 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 oil passage (100).

[0064] The main support member (240) can protrude from the inner surface of the valve housing (210) and support the main spring (230).

[0065] 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).

[0066] 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). During initial operation, when the reset valve (500) is opened and the trip valve (600) is closed, the fluid can flow to the main valve assembly (200) through the fluid supply passage (310). During normal operation, the reset valve (500) can be closed. In addition, in the event of an accident, when the trip valve (600) is opened, 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).

[0067] 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, when the trip valve (600) is opened, the fluid can be discharged to the outside through the fluid discharge passage (320). The fluid discharge passage (320) 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).

[0068] 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).

[0069] 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).

[0070] 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).

[0071] The malfunction prevention valve assembly (700) can close the flow channel (300) to prevent the main flow path (100) from being opened due to a malfunction of the trip valve (600). In other words, the malfunction prevention valve assembly (700) can close the flow channel (300) based on the internal pressure of the containment vessel (20) 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 internal pressure to allow the fluid of the main valve assembly (200) to be discharged to the outside by the trip valve (600). 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).

[0072] The malfunction prevention valve assembly (700) may include a cylinder (710), a cylinder pressurization portion (720), a malfunction prevention piston (730), a bellows (740), and a cylinder spring (750).

[0073] The cylinder (710) can movably support the malfunction prevention piston (730). The cylinder (710) can be formed to extend vertically inside the containment vessel (20). The cylinder (710) can include a cylinder body (711), a protrusion (712), and a containment passage (713).

[0074] The cylinder body (711) can provide a space in which a malfunction prevention piston (730) can be accommodated therein. In addition, a vent hole (711a), a communication hole (711b), and a connection port (711c) can be formed in the cylinder body (711).

[0075] A vent hole (711a) may be arranged on one side of the cylinder body (711) and connected to a cylinder pressurization unit (720). Fluid of the cylinder pressurization unit (720) flows into the interior of the cylinder body (711) through the vent hole (711a), and the malfunction prevention piston (730) may be pressed toward one side of the cylinder body (711) by the pressure of the flowing fluid. For example, the vent hole (711a) may be arranged on the upper side of the cylinder body (711).

[0076] The communication hole (711b) may be arranged on the other side of the cylinder body (711) opposite one side and may be connected to the containment passage (713). In the event of an accident, the pressure of the containment vessel may pressurize the malfunction prevention piston (730) toward the other side of the cylinder body (711) through the communication hole (711b). For example, the communication hole (711b) may be arranged on the lower side of the cylinder body (711).

[0077] The connecting port (711c) may be connected to the flow channel (300). The connecting port (711c) may be connected to the fluid supply channel (310) or the fluid discharge channel (320). For example, the connecting port (711c) may be formed on both sides of the cylinder body (711). In addition, the connecting port (711c) may be connected to the connecting port (731a) of the malfunction prevention piston (730), which will be described later, in the event of an accident.

[0078] The protrusion (712) can be extended from the inner surface of the cylinder body (711) to support the bellows (740). The protrusion (712) can support the lower side of the bellows (740).

[0079] The containment passage (713) can be connected to the cylinder body (711) so that one side is connected to the communication hole (711b) and the other side is connected to the interior of the containment vessel (20). The pressure of the containment vessel (20) can be transmitted to the interior of the cylinder body (711) by this containment passage (713).

[0080] The cylinder pressurization unit (720) is at least partially disposed inside the containment vessel (20) and can apply fluid to the inside of the cylinder (710). By the pressure of the fluid in the cylinder pressurization unit (720), the malfunction prevention piston (730) can be pressurized downward inside the cylinder pressurization unit (720) during normal operation. For example, the fluid can be steam or water. The cylinder pressurization unit (720) can include a chamber (721), a tank (722), a pressurization path (723), and a pressurization valve (724).

[0081] The chamber (721) may provide a space for containing a fluid therein. Additionally, the chamber (721) may be positioned outside the containment vessel (20). The pressure of the fluid in the chamber (721) may be atmospheric pressure.

[0082] The tank (722) can accommodate the chamber (721) such that at least a portion of the chamber (721) is immersed in water. The tank (722) can be positioned outside the containment vessel (20).

[0083] The pressurized passage (723) can be connected to the chamber (721) and the cylinder body (711) to provide a passage through which the fluid flows. The fluid can flow from the chamber (721) to the vent hole (711a) of the cylinder body (711) by the pressurized passage (723). In addition, the pressurized passage (723) can penetrate the containment vessel (20) to be connected to the chamber (721) and the cylinder body (711).

[0084] The pressurization valve (724) is connected to the pressurization passage (723) and can open and close the pressurization passage (723) to supply fluid to the chamber (721). In other words, the pressurization valve (724) can open the pressurization passage (723) to inject fluid into the chamber (721). The pressurization valve (724) can be provided on the pressurization passage (723) so as to be in contact with the outer surface of the containment vessel (20). In addition, a container-mounted double isolation valve can be applied as the pressurization valve. In addition, the pressurization valve (724) can be formed in multiple numbers. At least one of the multiple pressurization valves (724) can be arranged so as to be in contact with the containment vessel (20). For example, one of the plurality of pressurization valves (724) may be arranged in the pressurization path (723) so as to contact the containment vessel (20) and another of the plurality of pressurization valves (724) may be arranged so as to contact one of the above.

[0085] The malfunction prevention piston (730) 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 (730) can move up and down within the cylinder body (711). The malfunction prevention piston (730) can open and close the flow channel (300) based on the internal pressure of the containment vessel (20), the fluid pressure of the cylinder pressurization portion (720), and the restoring force of the cylinder spring (750). In other words, the malfunction prevention piston (730) can move to close the flow channel (300) when the fluid pressure of the cylinder pressurization portion (720) is greater than the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750). During normal operation, the fluid pressure of the cylinder pressurization unit (720) may be formed to be greater than the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750). The malfunction prevention piston (730) may move to open the flow channel (300) when the fluid pressure of the cylinder pressurization unit (720) is less than the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750), or when the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750) is greater than the fluid pressure of the cylinder pressurization unit (720). In the event of an accident, the pressure of the fluid in the cylinder pressurization unit (720) may be less than the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750), or the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750) may be greater than the pressure of the fluid in the cylinder pressurization unit (720).

[0086] The malfunction prevention piston (730) may include a piston head (731), a rod (732), a piston plate (733), and a sealing member (734).

[0087] The piston head (731) 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 (731a) through which a fluid can flow can be formed in the piston head (731). The piston head (731) can be pressurized by the fluid so that, during normal operation, the connecting passage (731a) and the flow channel (300) are placed in a position where they are blocked. In other words, during normal operation, the connecting passage (731a) can close the fluid discharge passage (320) or the fluid supply passage (310). In addition, the piston head (731) can be pressurized upward by the internal pressure of the containment vessel (20) so that, in the event of an accident, it moves to a position where the connecting passage (731a) and the flow channel (300) are connected. In other words, the connecting passage (731a) can be connected to the fluid discharge passage (320) or the fluid supply passage (310) in the event of an accident.

[0088] The rod (732) may extend upward from the piston head (731). In other words, the rod (732) may be positioned in the first space (S1). In addition, the rod (732) may support the piston plate (733).

[0089] A piston plate (733) may be arranged at the end of a rod (732) to divide the first space (S1) into a plurality of spaces. In addition, the piston plate (733) may contract or expand the bellows (740) by the movement of the piston head (731). In addition, a through hole (733a) connecting a plurality of first spaces (S1) may be formed in the piston plate (733).

[0090] A sealing member (734) is arranged in the piston head (731) to block the fluid in the flow channel (300) from flowing between the piston head (731) and the cylinder body (711). The sealing member (734) may be formed in multiple pieces. In addition, the multiple sealing members (734) may be arranged in a double-sealing manner so that when one of the sealing members (734) is broken, the other sealing member blocks the flow of the fluid. In addition, the multiple sealing members (734) may be arranged to be spaced apart from each other along the longitudinal direction of the cylinder body (711). The multiple sealing members (734) may include a first sealing member (734a), a second sealing member (734b), and a third sealing member (734c).

[0091] The first sealing member (734a) may be positioned above the second sealing member (734b) and the third sealing member (734c). The second sealing member (734b) may be positioned between the first sealing member (734a) and the third sealing member (734c). The third sealing member (734c) may be positioned below the first sealing member (734a) and the second sealing member (734b).

[0092] The first sealing member (734a) and the second sealing member (734b) can block the fluid of the flow channel (300) from flowing into the interior of the cylinder body (711) during normal operation. In addition, a connecting passage (731a) can be positioned between the second sealing member (734b) and the third sealing member (734c). The second sealing member (734b) and the third sealing member (734c) can block the fluid flowing in the connecting passage (731a) from flowing between the cylinder body (711) and the piston head (731) during an accident.

[0093] The bellows (740) can be arranged inside the cylinder body (711) to prevent fluid flowing between the cylinder body (711) and the piston head (731) from flowing out to the outside through the vent hole (711a). The bellows (740) can be arranged inside the cylinder body (711) so that the upper end is supported by the piston plate (733) and the lower end is supported by the piston head (731). The bellows (740) can be configured to contract when the malfunction prevention piston (730) moves toward the communication hole (711b) and to expand when it moves toward the vent hole (711a).

[0094] The cylinder spring (750) can provide restoring force to the malfunction-prevention piston (730). The cylinder spring (750) can be arranged in the second space (S2) of the cylinder body (711) and connected to the lower side of the piston head (731). The cylinder spring (750) is pressurized by the malfunction-prevention piston (730) during normal operation, and can provide restoring force to the malfunction-prevention piston (730) during an accident.

[0095] Hereinafter, the operation and effect according to the first embodiment of the present invention will be described.

[0096] Referring to FIG. 4, in the reactor valve device (1) according to the first embodiment of the present invention, when the reactor (2) is in initial operation, the main valve assembly (200) can close the main flow path (100). In other words, when the reactor (2) is in initial operation, the reset valve (500) is opened and the trip valve (600) is closed, so that the fluid of the fluid supplier (400) can flow into the valve housing (210) and pressurize the main piston (220) so that the main piston (220) closes the main flow path (100). When the reactor is in normal operation, the reset valve (500) can be closed. In addition, when the reactor (2) is in normal operation, the malfunction prevention valve assembly (700) can close the flow channel (300) to prevent the fluid from being discharged from the valve housing (210). In other words, the malfunction prevention valve assembly (700) can close the fluid supply path (310) or the fluid discharge path (320) during normal operation.

[0097] Referring further to FIGS. 5 and 6a, when the reactor (2) is in normal operation, or when the trip valve (600) malfunctions by opening the fluid discharge passage (320), the main valve assembly (200) can continue to close the main passage (100) by the malfunction prevention valve assembly (700). In other words, since the pressure of the fluid in the cylinder pressurization unit (720) during normal operation can be formed to be greater than the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750), the malfunction prevention valve assembly (700) can still close the flow channel (300) even during a malfunction. In other words, in case of a malfunction, the malfunction prevention valve assembly (700) can prevent the fluid from being discharged to the outside through the fluid discharge path (320) even if the trip valve (600) opens the flow channel (300). In addition, since the fluid can be prevented from being discharged to the outside by the malfunction prevention valve assembly (700) in case of a malfunction, the fluid can be prevented from being discharged from the main valve assembly (200).

[0098] FIG. 6b illustrates a state in which a flow channel (300) is closed by a modified malfunction prevention valve assembly (700). The modified malfunction prevention valve assembly (700) may include a pressure valve (724) communicating with a vent hole (711a) and a pressure passage (723) connected to the pressure valve (724). The pressure valve (724) may be arranged to be in close contact with the outer surface of the cylinder body (711) and may seal the vent hole (711a). In the case in which a separate pressure passage (723) is provided between the outer surface of the cylinder body (711) and the pressure valve (724), the pressure valve (724) is preferably arranged to be in direct contact with the outer surface of the cylinder body (711) because the separate pressure passage (723) may be damaged by pressure. The pressurized flow path (723) and the pressurized valve (724) of the modified malfunction prevention valve assembly (700) can be arranged in the space formed between the reactor vessel (10) and the containment vessel (20). Referring further to FIGS. 7 and 8, when the reactor (2) experiences an accident, the pressure of the containment vessel (20) can be formed to exceed the pressure of the cylinder pressurization portion (720), so that the malfunction prevention valve assembly (700) can open the flow channel (300). In other words, in the event of an accident, the pressure of the fluid in the cylinder pressurization unit (720) may be less than the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750), or the sum of the pressure of the containment vessel (20) and the restoring force of the cylinder spring (750) may be greater than the pressure of the fluid in the cylinder pressurization unit (720), so the malfunction prevention piston (730) may open the flow channel (300).

[0099] In addition, in the event of an accident, since the trip valve (600) can open the flow channel (300), the main valve assembly (200) can open the main passage (100). In other words, in the event of an accident, the fluid can be discharged from the valve housing (210) and discharged to the outside through the flow channel (300), so the main piston (220) can open the main passage (100). After the main passage (100) is opened, if the level of the condensate in the containment vessel (20) is higher than the coolant level in the reactor vessel (10), the coolant in the containment vessel (20) can flow into the interior of the reactor vessel (10).

[0100] 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).

[0101] 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 a mistake by the nuclear power plant.

[0102] Additionally, the fluid can be prevented from leaking out by the bellows (740) and the sealing member (734).

[0103] 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.

[0104] Referring to FIG. 9, as a first example, a malfunction prevention valve assembly (700) may be disposed between the reactor vessel (10) and the main valve assembly (200) and connected to the main passage (100). The malfunction prevention valve assembly (700) may close the main passage (100) during normal operation and in the event of a 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 internal pressure of the containment vessel (20) in the event of an accident. The connection port (711c) of the cylinder body (711) of the malfunction prevention valve assembly (700) may be connected to the main passage (100). Additionally, the piston head (731) can be moved by the internal pressure of the containment vessel (20) so that the connecting passage (731a) and the main passage (100) are connected in the event of an accident. When the connecting passage (731a) and the main passage (100) are connected, the coolant can flow into the interior of the reactor vessel (10).

[0105] Referring to FIG. 10, as a second example, the main euro (100) may include a first main euro (110) and a second main euro (120).

[0106] The first main flow (110) can be connected to the reactor vessel (10). A main valve assembly (200) is arranged in the first main flow (110) and can be opened and closed by the main valve assembly (200).

[0107] 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) during normal operation and during malfunction. In addition, the malfunction prevention valve assembly (700) can open the second main passage (120) based on the internal pressure of the containment vessel (20) in the event of an accident. The connection port (711c) of the cylinder body (711) of the malfunction prevention valve assembly (700) can be connected to the second main passage (120). In addition, the piston head (731) can be moved by the internal pressure of the containment vessel (20) in the event of an accident so that the connection passage (731a) and the second main passage (120) are connected. When the connection passage (731a) 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).

[0108] Hereinafter, the operation and effect of the reactor valve device (1) according to the second embodiment of the present invention will be described.

[0109] 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).

[0110] 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 when the trip valve (600) malfunctions.

[0111] 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 a plurality of bellows (740) are formed, and this difference will be primarily described.

[0112] The plurality of bellows (740) may include a first bellows (741) and a second bellows (742).

[0113] Referring to Fig. 11, as a first example, the first bellows (741) and the second bellows (742) may be arranged vertically in the first space (S1). The first bellows (741) may be arranged so that its upper side is supported by the piston plate (733) and its lower side is supported by the protrusion (712). The second bellows (742) may be arranged lower than the first bellows (741), its upper side is supported by the protrusion (712), and its lower side is supported by the piston head (731).

[0114] Referring further to FIG. 12, as a second example, the first bellows (741) and the second bellows (742) may be arranged to overlap each other in the first space (S1). In other words, the first bellows (741) and the second bellows (742) may be arranged in duplicate.

[0115] Referring further to FIG. 13, as a third example, the first bellows (741) may be disposed in the first space (S1), and the second bellows (742) may be disposed in the second space (S2). In addition, the rods (732), the piston heads (731), and the protrusions (712) may be formed in plurality. Any one of the plurality of rods (732) may extend upward from the piston head (731) to support any one of the plurality of piston heads (731). Another one of the plurality of rods (732) may extend downward from the piston head (731) to support any one of the plurality of piston heads (731). In addition, any one of the plurality of protrusions (712) may be disposed in the first space (S1), and another one of the plurality of protrusions (712) may be disposed in the second space (S2). The first bellows (741) may be arranged in the first space (S1) such that its upper side is supported by the piston head (731) and its lower side is supported by the protrusion (712). The second bellows (742) may be arranged in the second space (S2) such that its upper side is supported by the piston head (731) and its lower side is supported by the protrusion (712).

[0116] Hereinafter, the operation and effect of the reactor valve device (1) according to the third embodiment of the present invention will be described.

[0117] The reactor valve device (1) according to the third embodiment of the present invention can include a plurality of bellows (740), so that even if the fluid flowing in the flow channel (300) flows into the interior of the cylinder (710), it can be prevented from flowing out of the cylinder (710) through the vent hole (711a) and the communication hole (711b).

[0118] Hereinafter, a reactor valve device (1) according to a fourth embodiment of the present invention will be described. In describing the fourth embodiment, there is a difference in that the cylinder (710) can be positioned so that one side is positioned lower than the other side. This difference will be primarily described.

[0119] Referring to Fig. 14, the cylinder body (711) of the reactor valve device (1) according to the fourth embodiment of the present invention may have a first space (S1) positioned lower than a second space (S2). By means of this cylinder body (711), the cylinder spring (750) may be positioned higher than the malfunction prevention piston (730) and the bellows (740).

[0120] In addition, the containment passage (713) may be formed so that one side is connected to the communication hole (711b) and the other side is extended to be connected to the interior of the containment vessel (20), but the other side is open toward the bottom. By the other side of the containment passage (713), even if the communication hole (711b) is arranged on the upper side of the cylinder body (711), the internal pressure of the containment vessel (20) may be introduced into the interior of the cylinder body (711).

[0121] Additionally, the pressurized oil passage (723) can be connected to the lower side of the cylinder body (711) and communicated with the vent hole (711a).

[0122] Hereinafter, the operation and effect of the reactor valve device (1) according to the fourth embodiment of the present invention will be described.

[0123] The malfunction prevention piston (730) of the cylinder body (711) of the reactor valve device (1) according to the fourth embodiment of the present invention can be moved downward by the significantly increased pressure of the containment vessel (20) in the event of an accident, thereby connecting the flow channel (300) and the connecting passage (731a).

[0124] In addition, since the first space (S1) can be placed lower than the second space (S2) by the cylinder body (711), the fluid introduced into the first space (S1) can be discharged to the pressurized passage (723) by gravity, so that the fluid can be prevented from accumulating in the first space (S1).

[0125] Hereinafter, a reactor valve device (1) according to a fifth embodiment of the present invention will be described. In describing the fifth embodiment, there is a difference in that the cylinder spring (750) can be placed in the first space (S1), and this difference will be primarily described.

[0126] Referring to FIG. 15, the cylinder spring (750) of the reactor valve device (1) according to the fifth embodiment of the present invention can be placed in the first space (S1) so as to be placed on the upper side of the malfunction prevention piston (730).

[0127] The cylinder spring (750) can provide restoring force to the malfunction prevention piston (730) so that the connecting passage (731a) and the flow channel (300) are blocked during normal operation and in the event of a malfunction. In addition, the cylinder spring (750) can be contracted by the malfunction prevention piston (730) rising due to the internal pressure of the containment vessel (20) in the event of an accident.

[0128] The cylinder spring (750) of the reactor valve device (1) according to the fifth embodiment of the present invention can provide restoring force to the malfunction prevention piston (730) during normal operation and during malfunction, so that even if fluid is not sufficiently supplied from the cylinder pressurization unit (720), the connection path (731a) and the flow channel (300) can be blocked.

[0129] 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 for blocking fluid from being discharged from the main valve assembly so that the main valve assembly closes the main flow path, or for allowing fluid to be discharged 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 pressure inside the containment vessel, the flow channel is blocked 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 disposed inside the above containment vessel and connected to the flow channel; A cylinder pressurizing unit configured to provide pressurizing force to the inside of the cylinder; A malfunction prevention piston that reciprocates along the length of the cylinder within the cylinder to open and close the flow channel; and Includes a cylinder spring to provide restoring force to the above malfunction prevention piston, The above malfunction prevention piston is, Opening and closing the flow channel based on the internal pressure of the containment vessel, the pressing force of the cylinder pressurizing portion, and the restoring force of the cylinder spring. Reactor valve device.

3. In paragraph 2, The above malfunction prevention piston is, When the pressure of the cylinder pressurizing part is greater than the sum of the internal pressure of the containment vessel and the restoring force of the cylinder spring, the flow channel moves to close. Reactor valve device.

4. In paragraph 2, The above malfunction prevention piston is, When the pressure of the cylinder pressurizing part is less than the sum of the pressure of the containment vessel and the restoring force of the cylinder spring, or when the sum of the pressure of the containment vessel and the restoring force of the cylinder spring is greater than the pressure of the cylinder pressurizing part, the flow channel is moved to open. Reactor valve device.

5. In paragraph 2, The above cylinder, It includes a cylinder body including an internal space in which the above malfunction prevention piston is accommodated, The above cylinder body A vent hole formed on one side and communicating with the cylinder pressurization portion; a communication hole formed on the other side opposite the one side and communicating with the containment vessel; and a connection port formed communicating with the flow channel, The above malfunction prevention piston is formed with a connecting passage that provides a passage through which the fluid flows, The above malfunction prevention piston is, Moves toward the vent hole so that the connecting passage and the connecting port are in communication, or moves toward the communication hole so that the connecting passage and the connecting port are blocked. Reactor valve device.

6. In paragraph 5, The above-mentioned communication hole is positioned above the above-mentioned vent hole. Reactor valve device.

7. In paragraph 5, The above cylinder, Further comprising a protrusion protruding from the inside of the cylinder body, The above malfunction prevention valve assembly, Further comprising one or more bellows supported on the protrusion so as to be contracted or extended by the movement of the malfunction prevention piston. Reactor valve device.

8. In paragraph 7, The above cylinder spring is arranged between the malfunction prevention piston and the communication hole, The above bellows is located between the cylinder spring and the vent hole. Reactor valve device.

9. In paragraph 7, 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 second space, Reactor valve device.

10. In paragraph 5, The above malfunction prevention piston is, The above cylinder body, the piston head having the above connecting passage formed therein; a rod extending from the piston head toward the communication hole; and Includes a piston plate placed at the end of the above load, The piston plate above has a through hole formed therein. Reactor valve device.

11. In paragraph 10, The above malfunction prevention piston is, Further comprising a plurality of sealing members arranged on the piston head so as to be positioned on the upper and lower sides of the connecting passage, Reactor valve device.

12. In paragraph 2, The above cylinder pressurization part, A chamber disposed outside the above containment vessel and containing a fluid; A tank in which the chamber is accommodated; A pressurized passage penetrating the containment vessel and connected to the chamber and the cylinder, providing a passage for flowing the pressure of the fluid in the chamber to the cylinder; and A pressurized valve disposed in the pressurized passage so as to be positioned outside the containment vessel and opened and closed to supplement the pressure of the chamber, Reactor valve device.

13. In paragraph 12, The above pressure valve At least one of which is arranged in the pressurized passage so as to be in contact with the outer surface of the containment vessel. Reactor valve device.

14. In paragraph 5, The above-mentioned communication hole is positioned lower than the above-mentioned vent hole, The above cylinder, It further includes a containment passage having one side connected to the above-mentioned communication hole and the other side opposite to the one side connected to the inside of the containment vessel, The other side of the above containment passage is open toward the bottom, Reactor valve device.

15. In paragraph 1, 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 is arranged in one of the fluid supply path and the fluid discharge path. Reactor valve device.

16. A main passage connected to a reactor vessel and a containment vessel accommodating the reactor vessel, and providing a passage for the 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 for blocking fluid from being discharged from the main valve assembly so that the main valve assembly closes the main flow path, or for allowing fluid to be discharged 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 pressure inside the containment vessel, Reactor valve device.

17. In paragraph 16, The above malfunction prevention valve assembly, Connected to the main path so as to be positioned between the reactor vessel and the main valve assembly, Reactor valve device.

18. 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. Reactor valve device.

Images