KR-102964133-B1 - DEPRESSURIZATION SYSTEM FOR NUCLEAR REACTOR

KR102964133B1KR 102964133 B1KR102964133 B1KR 102964133B1KR-102964133-B1

Abstract

To provide a nuclear power plant depressurization system that ensures operability when performing depressurization even in a high-temperature environment inside a nuclear power plant, the nuclear power plant depressurization system according to the present invention comprises: a receiving portion connected to a nuclear power plant facility, into which high-pressure steam is introduced from the nuclear power plant facility and a steam outlet passage is formed through which the high-pressure steam is discharged; a first opening/closing member having one end disposed inside the receiving portion to open and close the steam outlet passage; a pressure providing portion having a pressure discharge passage formed through which a high-pressure fluid is discharged and filled inside so that the first opening/closing member closes the steam outlet passage when the nuclear power plant facility is in a normal pressure state; a second opening/closing member having one end disposed inside the pressure providing portion to close the pressure discharge passage when the nuclear power plant facility is in a normal pressure state; and a fluid supply portion that supplies an operating fluid to which the second opening/closing member opens the pressure discharge passage so that the first opening/closing member opens the steam outlet passage and the nuclear power plant facility is depressurized when the nuclear power plant facility is in an overpressure state. Accordingly, the present invention includes the effect of improving the stability of nuclear power plant operation by ensuring operability for performing pressure reduction of the nuclear power plant system when the nuclear power plant system is in an abnormal operating state.

Inventors

하희운
이석호
윤석종
한승주

Assignees

한국수력원자력 주식회사

Dates

Publication Date: 20260512
Application Date: 20240117

Claims (10)

A receiving section connected to a nuclear power plant facility, through which high-pressure steam flows in from the nuclear power plant facility and a steam outlet is formed through which the high-pressure steam flows out; A first opening/closing member having one end disposed inside the above-mentioned receiving portion to open/close the above-mentioned steam outlet; A pressure providing part in which a high-pressure fluid is filled inside so that when the above nuclear power plant facility is in a normal pressure state, the first opening/closing member closes the steam outlet, and a pressure release path is formed through which the high-pressure fluid is discharged; A second opening/closing member having one end disposed inside the pressure providing member to close the pressure release path when the nuclear power plant facility is in a normal pressure state; and A nuclear power plant depressurization system comprising a fluid supply unit that supplies an operating fluid such that when the nuclear power plant facility is in an overpressure state, the first opening/closing member opens the steam outlet path so that the nuclear power plant facility is depressurized, and the second opening/closing member opens the pressure release path.
In Article 1, The above fluid supply unit A nuclear power plant depressurization system characterized by being positioned outside a containment vessel in which the above-mentioned nuclear power plant equipment is provided.
In Article 2, The above fluid supply unit A supply frame forming a receiving space in which the above-mentioned working fluid is received, and A supply path connected to the supply frame and extending toward the interior of the containment vessel to form a path for supplying the working fluid, and A nuclear power plant depressurization system characterized by including a supply member that is movably provided inside the supply frame and advances toward the supply path so that the working fluid is supplied from the receiving space into the interior of the containment vessel.
In Paragraph 3, The above fluid supply unit A nuclear power plant depressurization system characterized by further including a recovery unit that recovers the supplied working fluid by retracting the supply member after the second opening/closing member opens the pressure release path.
In Paragraph 4, The above supply member is Another receiving space is formed within the supply frame, separated from the receiving space, to accommodate a different working fluid, and The above recovery unit is A shielding wall provided inside the supply frame to separate the other receiving space into a first space and a second space, and A circulation path forming a path through which the other working fluid circulates in the first space and the second space, and A nuclear power plant depressurization system characterized by including a circulation module provided in the above circulation path to circulate the other working fluid in the first space and the second space so that the supply member retracts.
In Paragraph 3, The above fluid supply unit A supply valve provided in the above supply path to control the supply of the above working fluid, and A nuclear power plant depressurization system characterized by further including a pressurizing member that pressurizes the supply member to advance when the supply valve opens the path of the supply flow path.
In Article 1, It further includes an operating unit that receives the operating fluid from the fluid supply unit and causes the second opening/closing member to open the pressure release path, and The above operating part An operating frame that forms an operating space internally, wherein the second opening/closing member extends from the pressure providing member and the other end is disposed in the operating space, and A nuclear power plant depressurization system characterized by including an operating member that is movably provided inside the operating frame to separate the operating space into a first operating space and a second operating space, and is connected so that the other end of the second opening/closing member is positioned in the first operating space, and the second opening/closing member opens the pressure release path by means of an operating fluid supplied to the second operating space.
In Article 1, A nuclear power plant depressurization system further comprising a pilot operating unit configured to transmit the high-pressure steam to the second opening/closing member according to the pressure change of the high-pressure steam transmitted from the receiving member, so that when the nuclear power plant facility is in an overpressure state, the second opening/closing member opens the pressure release path by the high-pressure steam.
In Article 8, The above second opening/closing member is A first rod positioned inside the pressure supply unit at one end to close the above pressure release path, and A nuclear power plant depressurization system characterized by including a rod support provided at the other end of the first rod, wherein the first rod is configured to open the pressure release path by the high-pressure steam transmitted from the pilot operating part.
In Article 9, The above pilot operating part A pilot frame that forms a pilot space for receiving the high-pressure steam transmitted from the receiving portion, and forms a pressure transmission path for transmitting the high-pressure steam from the pilot space to the load support, and A nuclear power plant depressurization system characterized by including a pilot opening/closing member provided inside the pilot frame to close the pressure transmission path and to open the pressure transmission path according to a pressure change of the high-pressure steam accommodated in the pilot space.

Description

Depressurization System for Nuclear Reactor The present invention relates to a nuclear power plant pressure reduction system, and more specifically, to a nuclear power plant pressure reduction system that reduces the pressure of a nuclear power plant system when overpressure occurs in the nuclear power plant system. Generally, it is important to maintain the pressure of the nuclear power plant system in a nuclear power plant. The pressure of the nuclear power plant system can change depending on the operating conditions, and in certain cases, an overpressure condition may occur. Accordingly, nuclear power plants are equipped with pressure reduction facilities to reduce the pressure of the nuclear power plant system in order to prevent accidents caused by overpressure. Prior art regarding such pressure reduction equipment is disclosed in Korean Registered Patent Publication No. 10-1535479 (Reactor coolant system pressure reduction system and nuclear power plant equipped with the same, July 3, 2015). The above-described invention can perform pressure reduction by opening an outlet so that a portion of the high-pressure steam of the nuclear power plant facility is discharged when overpressure occurs in the nuclear power plant facility. The depressurization equipment performs depressurization by classifying the nuclear power plant system into normal or abnormal operating states. In the case of an abnormal operating state, depressurization is carried out by an operator assessing the status of the nuclear power plant system and directly controlling the depressurization equipment. Conventional depressurization equipment was placed inside a containment vessel and performed depressurization using a fluid. However, there was a problem in that the fluid could change due to the high-temperature atmosphere inside the containment vessel, which could lead to reduced operability and consequently lower the reliability of the depressurization equipment. FIG. 1 is a conceptual diagram showing a depressurization system of a nuclear power plant facility according to the present embodiment. Figure 2 is an enlarged perspective view of A in Figure 1. Figure 3 is an enlarged perspective view of B in Figure 1. FIG. 4 is a conceptual diagram showing that the nuclear power plant depressurization system according to the present embodiment performs depressurization of the nuclear power plant system when the nuclear power plant system is in a normal operating state. FIG. 5 is a conceptual diagram showing that the nuclear power plant depressurization system according to the present embodiment performs depressurization of the nuclear power plant system when the nuclear power plant system is in an abnormal operating state. FIG. 6 is a conceptual diagram showing the recovery of the working fluid supplied by the fluid supply unit of the nuclear power plant depressurization system according to the present embodiment to the operating unit. Embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the embodiments disclosed below are not limited to those disclosed below and may be implemented in various forms; the embodiments provided are merely intended to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. The shapes of elements in the drawings may be exaggerated for clearer explanation, and elements indicated by the same reference numeral in the drawings represent the same element. FIG. 1 is a conceptual diagram showing a depressurization system of a nuclear power plant facility according to the present embodiment. As illustrated in FIG. 1, the nuclear power plant depressurization system (100) according to the present embodiment is connected to the nuclear power plant facility (10) and performs depressurization when the pressure of the nuclear power plant system exceeds the reference pressure. Here, the nuclear power plant depressurization system (100) can perform depressurization when overpressure occurs in the nuclear power plant system in either a normal operating state or an abnormal operating state. In a normal operating state, overpressure may occur when an operator controls the nuclear power plant facility of the nuclear power plant system. In an abnormal operating state, overpressure may occur due to damage to a specific nuclear power plant facility or abnormal operation in the nuclear power plant system. The nuclear power plant pressure reduction system (100) can detect pressure changes in the nuclear power plant system when the nuclear power plant system is in a normal operating state and automatically perform pressure reduction when the pressure exceeds the reference pressure. Additionally, the nuclear power plant pressure reduction system (100) can perform pressure reduction under the control of an operator when the nuclear power plant system is in an abnormal operating state. This n