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KR-102961968-B1 - NUCLEAR ENERGY FACILITY

KR102961968B1KR 102961968 B1KR102961968 B1KR 102961968B1KR-102961968-B1

Abstract

The present invention relates to a nuclear power plant. Specifically, according to one embodiment of the present invention, a nuclear power plant may be provided comprising: a reactor; a containment vessel in which the reactor is disposed; a main valve disposed within the containment vessel to be connected to the interior of the reactor, configured to be openable and closed so as to communicate or not communicate between the interior of the reactor and the interior of the containment vessel, and configured to be closed when a working fluid is supplied and open when a working fluid is discharged; a reset valve that opens to supply a working fluid to the main valve; a trip valve that opens to discharge a working fluid from the main valve; a malfunction prevention check valve configured to allow fluid flow from the interior of the containment vessel toward the interior of the reactor but not to allow fluid flow from the interior of the reactor toward the interior of the containment vessel when the main valve is opened; and a piping section connected to allow a working fluid to flow between two or more of the main valve, the reset valve, and the trip valve.

Inventors

  • 이종희
  • 조현준
  • 장정봉
  • 김석

Assignees

  • 한국원자력연구원

Dates

Publication Date
20260507
Application Date
20230908

Claims (7)

  1. nuclear pile; A containment vessel in which the above-mentioned reactor is housed; A main valve disposed inside the containment vessel to be connected to the interior of the reactor, opened and closed to ensure communication between the interior of the reactor and the interior of the containment vessel, and configured to close when a working fluid is supplied and open when a working fluid is discharged; A reset valve that opens to supply working fluid to the main valve; A trip valve that opens to allow the working fluid to be discharged from the main valve; A malfunction prevention check valve configured such that when the main valve is opened, fluid flow from the inside of the containment vessel toward the inside of the reactor but fluid flow from the inside of the reactor toward the inside of the containment vessel is not allowed; and It includes a piping section connected to allow working fluid to flow between two or more of the main valve, the reset valve, and the trip valve, and The above main valve is, A reactor connecting channel connected to the interior of the reactor, and a main valve opening/closing hole formed in the reactor connecting channel and communicating with the interior of the containment vessel, and a main valve body connected to the piping section; and It includes a main valve plunger movably disposed in the main valve body to open and close the main valve opening/closing hole, and The above malfunction prevention check valve is, A check valve support configured such that its interior communicates with the main valve opening/closing hole and a check valve opening/closing hole is formed that communicates with the interior of the containment vessel; and It includes a check valve opening/closing member rotatably disposed inside the check valve support to open/close the check valve opening/closing hole, and The above-mentioned malfunction prevention check valve has a containment communication hole formed therein that communicates with the inside of the containment vessel to allow fluid flow from the inside of the reactor toward the inside of the containment vessel when the check valve opening/closing hole is closed by the check valve opening/closing member. Nuclear power facilities.
  2. In Article 1, The above malfunction prevention check valve is connected to the main valve, connected to the inside of the reactor and the main valve, disposed in the main valve to be connected to the inside of the reactor, or disposed in a connecting conduit connecting the inside of the reactor and the main valve. Nuclear power facilities.
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  6. In Article 1, The above malfunction prevention check valve is, A check valve support having a check valve opening/closing hole formed therein and disposed in the reactor connecting channel or in a connecting conduit connecting the inside of the reactor and the reactor connecting channel; and A check valve opening/closing member comprising a check valve opening/closing member rotatably disposed in the reactor connecting channel or the connecting conduit to open/close the check valve opening/closing hole, Nuclear power facilities.
  7. In Article 1, The above malfunction prevention check valve is, A check valve support having a flow path formed therein that is connected to the main valve opening/closing hole and communicates with the interior of the containment vessel or is connected to the interior of the reactor and the reactor connecting path; A check valve opening/closing member movably disposed on the check valve support to open/close the above flow path; and A check valve elastic member comprising elastically supporting the check valve opening/closing member in a direction closing the above flow path, Nuclear power facilities.

Description

Nuclear Energy Facility The present invention relates to a nuclear power plant. In some small modular reactors, a natural circulation method using a main valve is adopted to achieve emergency core cooling without operator intervention or the aid of emergency power in the event of an accident. Emergency core cooling using the natural circulation method with a main valve involves circulating a cooling fluid, such as coolant, between the interior of the reactor and the interior of the containment vessel in which the reactor is housed during an accident. The main valve is opened and closed by the working fluid. When the reset valve opens, the working fluid is supplied to the main valve and the main valve closes, and when the trip valve opens, the working fluid is discharged from the main valve and the main valve opens. Meanwhile, a malfunction valve connected to the main valve is provided so that the main valve does not open even if the operator accidentally operates the trip valve during normal operation of the reactor. With this malfunction prevention valve, even if the operator accidentally operates the trip valve, the main valve closes due to the pressure difference between the inside of the reactor and the inside of the containment vessel; since the main valve remains closed at this time, the reactor can be maintained in a sealed state. Conventional malfunction prevention valves adopt a mechanical actuation method, and high reliability and accuracy of mechanical components are required to implement the valve operation mechanism. FIG. 1 is a drawing showing a nuclear power plant according to a first embodiment of the present invention. FIG. 2 is a diagram showing the operation of a reactor of a nuclear power facility during initial operation and normal operation according to the first embodiment of the present invention. FIG. 3 is a diagram showing the operation of a trip valve when it is unintentionally opened during normal operation of a reactor in a nuclear power plant according to the first embodiment of the present invention. FIG. 4 is a diagram showing the operation during maintenance, repair, and nuclear fuel reloading of a reactor of a nuclear power facility according to the first embodiment of the present invention. FIG. 5 is a diagram showing the operation of a nuclear reactor in the event of an accident according to the first embodiment of the present invention. FIG. 6 is a drawing showing embodiments of a check valve for preventing malfunction of a nuclear power plant according to a second embodiment of the present invention. FIG. 7 is a diagram showing the operation of a nuclear power facility and a reactor during initial operation and normal operation according to the third embodiment of the present invention. FIG. 8 is a diagram showing the operation of a trip valve when it is unintentionally opened during normal operation of a reactor in a nuclear facility according to the third embodiment of the present invention. FIG. 9 is a diagram showing the operation during maintenance, repair, and nuclear fuel reloading of a reactor of a nuclear power facility according to the third embodiment of the present invention. FIG. 10 is a diagram showing the operation of a nuclear reactor in the event of an accident according to the third embodiment of the present invention. FIG. 11 is a drawing showing when a check valve for preventing malfunction of a nuclear power plant according to the fourth embodiment of the present invention is closed and when it is open. Hereinafter, specific embodiments for implementing the technical concept of the present invention will be described in detail with reference to the drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted. Furthermore, when it is mentioned that one component is 'connected,' 'supported,' or 'supplied' to another component, it should be understood that while it may be directly connected, supported, or supplied to that other component, there may also be other components present in between. The terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. Furthermore, it should be noted in advance that expressions such as top, bottom, and side in this specification are described based on the drawings, and may be expressed differently if the orientation of the object changes. For the same reason, some components in the attached drawings may be exaggerated, omitted, or schematically depicted, and the size of each component does not entirely reflect its actual size. Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but such components are not limited by such term