KR102172838B1 - Safety injection tank including ball valve to prevent injection of pressure gas into reactor - Google Patents

Safety injection tank including ball valve to prevent injection of pressure gas into reactor Download PDF

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KR102172838B1
KR102172838B1 KR1020190097077A KR20190097077A KR102172838B1 KR 102172838 B1 KR102172838 B1 KR 102172838B1 KR 1020190097077 A KR1020190097077 A KR 1020190097077A KR 20190097077 A KR20190097077 A KR 20190097077A KR 102172838 B1 KR102172838 B1 KR 102172838B1
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South Korea
Prior art keywords
ball valve
cooling water
safety injection
injection tank
floating body
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KR1020190097077A
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Korean (ko)
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추봉식
송준규
김세윤
김민정
김창현
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한국수력원자력 주식회사
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/18—Emergency cooling arrangements; Removing shut-down heat
    • G21C15/182—Emergency cooling arrangements; Removing shut-down heat comprising powered means, e.g. pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/22—Safety features
    • B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/14—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with ball-shaped valve member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Abstract

The present invention relates to a safety injection tank for supplying cooling water to a cooling water system for cooling a core in the event of a loss of cooling water in a nuclear power plant. Moreover, the present invention relates to a safety injection tank in which when a buoyant body with buoyancy moves as a water level decreases due to discharge of the cooling water and a cooling water level approaches a depletion alarm line, a ball valve is closed in accordance with a descent of the buoyant body, and supply of the cooling water is blocked, thereby preventing deterioration of cooling performance caused by pressure gas supplied to a reactor cooling system.

Description

원자로 가압가스 주입 방지를 위한 볼밸브가 포함된 안전주입탱크{SAFETY INJECTION TANK INCLUDING BALL VALVE TO PREVENT INJECTION OF PRESSURE GAS INTO REACTOR}SAFETY INJECTION TANK INCLUDING BALL VALVE TO PREVENT INJECTION OF PRESSURE GAS INTO REACTOR}

본 발명은 원자력 발전소 냉각수 상실 사고시 노심냉각을 위하여 냉각수계통에 냉각수를 공급하기 위한 안전주입탱크에 관한 것이다. The present invention relates to a safety injection tank for supplying cooling water to a cooling water system for cooling a core in the event of a loss of cooling water in a nuclear power plant.

원자력 발전소에서 냉각수 상실 사고가 발생하게 되면, 이러한 비상시의 노심생각을 위한 안전주입탱크가 형성되어 있다. 안전주입탱크는 가압가스계통을 통해 일정 압력으로 가압되어 있으며 원자로 냉각계통의 압력이 안전주입탱크 압력 이하로 감소하면 압력 차이에 의해 안전주입탱크 내 냉각수가 자동으로 원자로 냉각계통으로 주입된다. When a loss of cooling water accident occurs in a nuclear power plant, a safety injection tank is formed for such an emergency core thinking. The safety injection tank is pressurized to a certain pressure through the pressurized gas system, and when the pressure of the reactor cooling system decreases below the pressure of the safety injection tank, the cooling water in the safety injection tank is automatically injected into the reactor cooling system due to the pressure difference.

도 1은 종래의 안전주입탱크를 나타낸 것으로, 안전주입탱크(20)에는 냉각수가 채워져 있으며, 상부에는 가압가스가 충진되어 있고, 안전주입탱크(20) 상부에는 가압가스탱크(10)가 가압가스배관(41)을 통해 연결되어 있으며, 가압가스배관(41) 상에는 가압가스공급밸브(42)가 위치한다. 1 shows a conventional safety injection tank, the safety injection tank 20 is filled with coolant, the upper part is filled with pressurized gas, and the pressurized gas tank 10 is on the top of the safety injection tank 20 It is connected through a pipe 41 and a pressurized gas supply valve 42 is positioned on the pressurized gas pipe 41.

교류전원 상실 사고 등의 비상상황에서 질소가스의 가압에 의해 안전주입탱크(20)의 냉각수가 유출 배관(43)을 통해 원자로 냉각계통(30)으로 공급된다. 그러나 종래에는 교류전원이 상실된 상태에서는 안전주입계통(20)의 냉각수의 공급을 차단할 수 있는 장치가 없어 냉각수가 임계수위보다 낮아지게 되면 냉각수 가압에 사용된 질소가스가 냉각계통(30)으로 주입되어 원자로의 냉각효율을 저하시킬 우려가 있었다.In an emergency situation such as an AC power loss accident, the cooling water of the safety injection tank 20 is supplied to the reactor cooling system 30 through the outlet pipe 43 by pressurization of nitrogen gas. However, conventionally, there is no device that can block the supply of cooling water from the safety injection system 20 in a state in which the AC power is lost, so when the cooling water becomes lower than the critical water level, nitrogen gas used to pressurize the cooling water is injected into the cooling system 30. There was a fear of lowering the cooling efficiency of the reactor.

안전주입탱크 내에는 상부에 가압가스, 하부에 냉각수가 분포하고 있으며 안전주입탱크 내 냉각수의 배출의 임계수위인 저수위 시점에서 안전주입탱크의 냉각수 공급을 차단하지 않으면 냉각수 계통으로 가압가스가 유입되어 노심냉각기능을 저하시킬 우려가 있었다. In the safety injection tank, pressurized gas and cooling water are distributed in the upper part, and if the supply of cooling water from the safety injection tank is not shut off at the low water level, which is the critical water level for the discharge of cooling water in the safety injection tank, pressurized gas flows into the cooling water system to cool the core. There was a fear of reducing the function.

따라서, 모든 교류전원이 상실된 비상상황에서도 안전주입탱크 냉각수의 저수위 시점에 별도의 운전원의 조치 없이 신속하게 안전주입탱크로부터의 냉각수 공급을 차단할 수 있는 장치가 필요하였다. Therefore, even in an emergency situation in which all AC power is lost, there is a need for a device that can quickly cut off the supply of cooling water from the safety injection tank at the time of the low water level of the safety injection tank without a separate operator's action.

한국특허등록 제1525322호(2015.05.27. 공개)Korean Patent Registration No. 1525322 (published on May 27, 2015) 한국특허공개 제2011-0008950호(2011.01.27. 공개)Korean Patent Publication No. 2011-0008950 (published on January 27, 2011)

본 발명의 목적은 교류전원 상실 등으로 야기되는 중대사고 발생시 안전주입탱크의 냉각수가 임계수위 시점에 도달하였을 때에도 외부전원 없이도 신속하게 안전주입탱크로부터의 냉각수 및 가압가스의 공급을 차단할 수 있는 장치를 제공하는 것이다.It is an object of the present invention to provide a device that can quickly cut off the supply of cooling water and pressurized gas from the safety injection tank without external power even when the cooling water of the safety injection tank reaches the critical water level point in case of a serious accident caused by loss of AC power, etc. To provide.

상기 본 발명의 목적은, 냉각수를 수용하며, 비상시 가압가스의 가압력을 이용하여 상기 냉각수를 원자로 냉각계통으로 공급하는 안전주입탱크에 있어서, 상기 냉각수가 수용되는 수용공간을 형성하는 탱크 본체, 상기 수용공간과 상기 원자로 냉각계통을 연결하는 유출 배관, 상기 유출 배관 상부에 위치하며 상기 유출배관과 연결된 냉각수유로를 형성하는 볼밸브, 상기 냉각수 수위에 따라 상하방향으로 이동하는 부유체, 및 상기 부유체와 상기 볼밸브를 연결하는 축부를 포함하며, 상기 부유체가 일정 수준보다 낮아지면 상기 축부의 회전에 의해 볼밸브는 폐쇄되며, 상기 볼밸브 상부와 상기 볼밸브 하부의 연통이 차단되어 상기 냉각수 및 상기 가압가스가 상기 원자로 냉각계통으로 주입되지 않는 안전주입탱크에 의해 달성된다.An object of the present invention is a safety injection tank for receiving cooling water and supplying the cooling water to a reactor cooling system using a pressing force of a pressurized gas in case of an emergency, the tank body forming an accommodation space for receiving the cooling water, the accommodation An outlet pipe connecting the space and the reactor cooling system, a ball valve positioned above the outlet pipe and forming a cooling water passage connected to the outlet pipe, a floating body moving in a vertical direction according to the cooling water level, and the floating body It includes a shaft part connecting the ball valve, and when the floating body is lower than a certain level, the ball valve is closed by rotation of the shaft part, and communication between the upper part of the ball valve and the lower part of the ball valve is blocked, so that the cooling water and the pressure This is achieved by a safety injection tank in which no gas is injected into the reactor cooling system.

상기 볼밸브는, 일측에서 타측으로 관통하는 유로가 형성된 볼밸브몸체부, 상기 유로 상에 위치하며, 관통부가 형성된 볼 형상의 개폐체, 상기 볼밸브몸체부와 상기 개폐체의 사이에 위치하는 밀봉재, 및 상기 개폐체로부터 연장되어 형성되며, 상기 축부와 연결되는 연결부를 포함하여 이루어질 수 있다. The ball valve includes: a ball valve body having a flow path penetrating from one side to the other; a ball-shaped opening and closing body positioned on the flow path and having a through portion; and a sealing material positioned between the ball valve body and the opening and closing body And a connection part extending from the opening and closing body and connected to the shaft part.

일측이 상기 탱크 본체에 고정되어 있고 타측이 상기 부유체에 연결되어 있으며, 상기 부유체에 하부방향으로 탄성력을 가하는 탄성체부를 더 포함할 수 있다. One side is fixed to the tank body and the other side is connected to the floating body, and may further include an elastic body portion that applies an elastic force to the floating body in a downward direction.

상기 탄성체부의 일측은 상기 탱크 본체의 바닥부에 연결되며, 타측은 상기 부유체에 연결될 수 있다. One side of the elastic body may be connected to the bottom of the tank body, and the other side may be connected to the floating body.

상기 탄성체부는 탄성력이 상기 부유체의 냉각수에서의 부력에 비해 작도록 형성될 수 있다. The elastic body portion may be formed such that the elastic force is smaller than the buoyancy force in the cooling water of the floating body.

상기 탄성체부는 코일 스프링일 수 있다. The elastic body portion may be a coil spring.

상기 볼밸부몸체부의 상단부는 고갈경보선 이하의 높이에 위치하도록 형성될 수 있다.The upper end portion of the ball bell body portion may be formed to be located at a height below the exhaustion warning line.

본 발명은 모든 교류전원이 상실된 비상상황에서 별도의 전원이나 운전원의 조치 없이 부유체가 연결된 볼밸브를 이용해 안전주입탱크의 냉각수 수위가 고갈경보선 이하로 낮아지는 것을 방지함으로써 안전주입탱크 내의 질소가 냉각수계통으로 유입되는 것을 방지하여 원자로 냉각계통의 냉각효율이 저하되는 것을 방지하는데 효과가 있다.The present invention prevents the cooling water level of the safety injection tank from lowering below the depletion alarm line by using a ball valve connected to a floating body in an emergency situation in which all AC power is lost, without any additional power or operator action. It is effective in preventing the cooling efficiency of the reactor cooling system from deteriorating by preventing it from entering the system.

도 1은 종래의 안전주입탱크를 나타낸 것이다.
도 2는 본 발명의 일실시예에 따른 안전주입탱크를 나타낸 모식도이다.
도 3은 본 발명의 일실시예에 따른 볼밸브의 단면도이다.
도 4는 비상 상황 시 본 발명의 일실시예에 따른 안전주입탱크의 냉각수의 수위가 임계수위에 도달한 상태를 나타낸 모식도이다.
도 5는 본 발명의 일실시예에 따른 안전주입탱크의 냉각수의 수위가 임계수위에 도달한 상태의 볼밸브의 단면도이다. 1 shows a conventional safety injection tank.
Figure 2 is a schematic diagram showing a safety injection tank according to an embodiment of the present invention.
3 is a cross-sectional view of a ball valve according to an embodiment of the present invention.
4 is a schematic diagram showing a state in which the water level of the cooling water of the safety injection tank has reached the critical water level according to an embodiment of the present invention in an emergency situation.
5 is a cross-sectional view of a ball valve in a state in which the level of coolant in the safety injection tank reaches a critical level according to an embodiment of the present invention.

이하 도면을 참조하여 본 발명을 더욱 상세히 설명한다.The present invention will be described in more detail below with reference to the drawings.

첨부된 도면은 본 발명의 기술적 사상을 더욱 구체적으로 설명하기 위하여 도시한 일 예에 불과하므로 본 발명의 사상이 첨부된 도면에 한정되는 것은 아니다. 또한 첨부된 도면은 각 구성요소 간의 관계를 설명하기 위해 크기와 간격 등이 실제와 달리 과장되어 있을 수 있다.The accompanying drawings are only an example illustrated to describe the technical idea of the present invention in more detail, and the spirit of the present invention is not limited to the accompanying drawings. In addition, in the accompanying drawings, sizes and intervals may be exaggerated differently from the actual in order to explain the relationship between each component.

도 2는 본 발명의 일실시예에 따른 비상 상황 이전의 일반 상황에서의 원자로가 정상가동 상태일 때의 안전주입탱크(200)의 내부 일부를 나타낸 모식도이다. 안전주입탱크(200)는 상측에서 가압가스탱크와 가압가스주입배관으로 연결되어 있으며(미도시), 안전주입탱크(200)의 내부는 냉각수와 가압가스로 채워져 있다. 안전주입탱크(200)에 채워진 냉각수는 일반적으로 붕산수를 사용한다. 본 발명에서의 가압가스는 질소가스일 수 있다. 2 is a schematic diagram showing a part of the interior of the safety injection tank 200 when the reactor is in a normal operating state in a normal situation before an emergency situation according to an embodiment of the present invention. The safety injection tank 200 is connected from the upper side by a pressurized gas tank and a pressurized gas injection pipe (not shown), and the interior of the safety injection tank 200 is filled with cooling water and pressurized gas. The cooling water filled in the safety injection tank 200 is generally boric acid water. The pressurized gas in the present invention may be nitrogen gas.

본 발명의 안전주입탱크(200)는 탱크본체(210)를 포함하며, 탱크 본체(210)에는 냉각수가 수용되는 수용공간이 형성되어 있다. 냉각수가 수용되는 수용공간과 원자로 냉각계통은 유출 배관(430)을 통해 연결된다. The safety injection tank 200 of the present invention includes a tank body 210, and a receiving space for receiving cooling water is formed in the tank body 210. The receiving space in which the cooling water is accommodated and the reactor cooling system are connected through an outlet pipe 430.

볼밸브(600)는 유출 배관(430)의 상부에 위치하며, 부유체(510)는 축부(530)에 의해 볼밸브(600)에 연결되어 냉각수 수위에 따라 상하방향으로 이동할 수 있다. The ball valve 600 is located above the outlet pipe 430, and the floating body 510 is connected to the ball valve 600 by the shaft portion 530 so as to move up and down according to the coolant level.

탄성체부(520)는 일측이 탱크 본체(210)에 고정되어 있으며 타측이 부유체(510)에 연결되어 있으며, 부유체(210)에 하부방향으로 당기는 탄성력을 가한다. 좀 더 구체적으로는, 탄성체부(520)는 일측이 탱크 본체(210)의 바닥부에 연결되어 있다. The elastic body portion 520 has one side fixed to the tank body 210 and the other side connected to the floating body 510, and applies an elastic force to the floating body 210 that pulls downward. More specifically, one side of the elastic body portion 520 is connected to the bottom portion of the tank body 210.

탄성체부(520)가 부유체(210)를 하부방향으로 당기는 탄성력은 부유체(510)가 안전주입탱크(200)의 냉각수 내에서 가지는 부력에 비해 작도록 형성된다. 다른 실시예에서 탄성체부는 생략이 가능하며, 부유체(510)가 일정한 질량을 가지도록 마련하며, 무게중심을 회전방향 측에 있도록 하여, 한쪽 방향으로 기울어지게 할 수 있다.The elastic force of the elastic body 520 to pull the floating body 210 downward is formed to be smaller than the buoyancy that the floating body 510 has in the cooling water of the safety injection tank 200. In another embodiment, the elastic body portion may be omitted, and the floating body 510 is provided to have a constant mass, and the center of gravity is on the side of the rotation direction, so that it can be tilted in one direction.

탄성체부(520)는 부유체(510)를 하부방향으로 당기는 힘을 가지는 탄성체 소재이면서, 냉각수에 장기간 접촉 시에도 부식이나 변형이 발생하지 않는 소재로 마련된다. 본 발명의 일실시예로 스테인리스강을 이용한 코일스프링을 이용하여 탄성체부(520)를 형성하였다. The elastic body portion 520 is an elastic body material having a force to pull the floating body 510 in a downward direction, and is made of a material that does not cause corrosion or deformation even when in contact with cooling water for a long period of time. In an embodiment of the present invention, an elastic body part 520 was formed using a coil spring made of stainless steel.

도 3은 본 발명의 일실시예에 따른 볼밸브의 단면도로서, 도 2의 관점으로부터 측방향으로 90°회전된 방향에서 바라본 안전주입탱크(200)를 부분 확대하여 단면도로 나타낸 것이다. 도 3에는 부유체 및 탄성체부를 생략하였다. 3 is a cross-sectional view of a ball valve according to an embodiment of the present invention, showing a partial enlarged cross-sectional view of the safety injection tank 200 viewed from a direction rotated 90° laterally from the perspective of FIG. 2. In FIG. 3, the floating body and the elastic body portion are omitted.

도 3에 도시한 바와 같이, 볼밸브(600)는 유출 배관(430)의 상부에 위치하며, 볼밸브(600)의 상단으로부터 유입된 냉각수는 유출 배관(430)으로 배출될 수 있도록 냉각수유로가 형성된다. As shown in Figure 3, the ball valve 600 is located on the top of the outlet pipe 430, the cooling water flow path so that the coolant introduced from the top of the ball valve 600 can be discharged to the outlet pipe 430. Is formed.

볼밸브(600)는, 일측에서 타측으로 관통하는 유로가 형성된 냉각수유로가 형성된 볼밸브몸체부(640)와, 볼밸브몸체부(640) 내의 냉각수유로 상에 위치하며 관통부가 형성된 볼 형상의 개폐체(610)와, 볼밸브몸체부(640)와 개폐체(610)의 사이의 적어도 일부 공간에 위치하는 밀봉재(620)와, 개폐체(640)로부터 연장되어 형성되며 축부(530)와 연결되는 연결부(630)를 포함하여 이루어진다. The ball valve 600 is a ball valve body portion 640 having a cooling water passage formed with a passage passing from one side to the other side, and a ball-shaped opening and closing of the ball valve body portion 640 located on the cooling water passage in the ball valve body portion 640 The sieve 610, the sealing material 620 located in at least a partial space between the ball valve body 640 and the opening and closing body 610, is formed extending from the opening and closing body 640 and connected to the shaft 530 It is made including a connecting portion 630.

밀봉재(620)는, 개폐체(610)가 회전하여 폐쇄 위치에 있을 때 볼밸브(600)의 폐쇄가 잘 이루어지도록 개폐체(610)와 볼밸브몸체부(640) 사이에 위치한다. 밀봉재(620)는 개폐체(610)의 회전이 원활하게 이루어지도록 하기 위해, 마찰력이 적으면서도, 개폐체(610)의 폐쇄 위치에서 볼밸브(600)의 상하 밀폐가 잘 이루어지는 소재를 포함하여 마련된다. 이러한 조건에 적합한 소재로서 탄성중합체가 있으며, 밀봉재(620)는 탄성중합체를 포함하여 형성될 수 있다. The sealing material 620 is positioned between the opening/closing body 610 and the ball valve body 640 so that the ball valve 600 can be well closed when the opening/closing body 610 rotates and is in a closed position. The sealing material 620 is prepared by including a material that has low frictional force and is well sealed up and down of the ball valve 600 in the closed position of the opening and closing body 610 in order to smoothly rotate the opening and closing body 610 do. As a material suitable for these conditions, there is an elastomer, and the sealing material 620 may be formed including an elastomer.

연결부(630)는 개폐체(610)와 함께 축부(530)의 회전축이 된다. 따라서, 부유체(510)의 위치에 따라 축부(530)가 회전할 때, 개폐체(610)도 연결부(630)와 함께 축부(530)가 회전한 각도만큼 회전하게 된다. The connection part 630 becomes a rotation shaft of the shaft part 530 together with the opening and closing body 610. Accordingly, when the shaft portion 530 rotates according to the position of the floating body 510, the opening and closing body 610 is also rotated by the angle at which the shaft portion 530 rotates together with the connection portion 630.

안전주입탱크(200)의 냉각수 수위가 부유체(510)의 위치보다 높은 위치일 때의 개폐체(610)의 관통부는 냉각수 유로와 일치하는 방향에 위치하여 볼밸브(600)는 개방된 상태가 된다. When the cooling water level of the safety injection tank 200 is higher than the position of the floating body 510, the penetrating part of the opening and closing body 610 is located in a direction coincident with the cooling water flow path, so that the ball valve 600 is in an open state. do.

이하 도 4 및 도 5를 참조하여 본 발명의 일실시예에 따른 부유체(510), 축부(530) 및 볼밸브(600)의 작동에 대해 설명한다. Hereinafter, operations of the floating body 510, the shaft portion 530, and the ball valve 600 according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5.

도 4는 비상 상황 시 본 발명의 일실시예에 따른 안전주입탱크의 냉각수의 수위가 임계수위에 도달한 상태를 나타낸 모식도이며, 도 5는 도 4에서의 볼밸브를 구체적으로 나타낸 것이다. 도 5의 관점은 도 4에 비해 측방향으로 90°회전된 위치에서 본 상태를 나타내었다. 도 4에는 부유체 및 탄성체부를 생략하였다. 4 is a schematic diagram showing a state in which the water level of the coolant in the safety injection tank according to an embodiment of the present invention reaches a critical level in an emergency situation, and FIG. 5 is a detailed view of the ball valve in FIG. 4. The perspective of FIG. 5 shows a state viewed from a position rotated by 90° in the lateral direction compared to FIG. 4. In Fig. 4, the floating body and the elastic body portion are omitted.

교류 전원 상실사고 등의 비상 상황이 발생하게 되고, 원자로 냉각계통의 압력이 정상 상태보다 낮아지게 되면, 안전주입탱크(200)의 냉각수가 유출 배관(430)을 통해 배출된다. 안전주입탱크(200)의 냉각수는 볼밸브(600)의 상단부를 통해 냉각수유로로 유입되어 유출 배관(430)으로 배출된다. When an emergency situation such as an AC power loss accident occurs and the pressure of the reactor cooling system becomes lower than the normal state, the cooling water of the safety injection tank 200 is discharged through the outlet pipe 430. The cooling water of the safety injection tank 200 flows into the cooling water passage through the upper end of the ball valve 600 and is discharged through the outlet pipe 430.

안전주입탱크(200)의 냉각수가 배출되어 냉각수 수위가 부유체(510)의 위치보다 낮아지게 되면, 부유체(510)도 수위 저하와 탄성체부(520)의 하부 방향으로 당기는 탄성력에 의해 하방으로 이동한다. When the cooling water of the safety injection tank 200 is discharged and the cooling water level is lower than the position of the floating body 510, the floating body 510 is also lowered by the lowering of the water level and an elastic force pulling the elastic body portion 520 downward. Move.

도 4 및 도 5에서 도시한 바와 같이, 냉각수 수위가 배출 한계선인 고갈경보선에 근접하면, 부유체(510)도 고갈경보선 부근까지 하강하게 된다. 부유체(510)의 하강에 따라, 부유체(510)에 연결된 축부(530)가 볼밸브(600)의 연결부(630)를 회전축으로 회전하며, 연결부(630)와 함께 개폐체(610)가 회전하여 볼밸브(600)는 폐쇄된다. 이로 인해, 볼밸브(600) 상부와 볼밸브(600) 하부의 연통이 차단되어 안전주입탱크(200)의 냉각수 및 가압가스가 원자로 냉각계통으로 주입되지 않는다. As shown in FIGS. 4 and 5, when the cooling water level approaches the exhaustion alarm line, which is the discharge limit line, the floating body 510 also descends to the vicinity of the exhaustion alarm line. As the floating body 510 descends, the shaft portion 530 connected to the floating body 510 rotates the connection portion 630 of the ball valve 600 with a rotation axis, and the opening and closing body 610 together with the connection portion 630 By rotating the ball valve 600 is closed. As a result, communication between the top of the ball valve 600 and the bottom of the ball valve 600 is blocked so that the cooling water and pressurized gas of the safety injection tank 200 are not injected into the reactor cooling system.

볼밸브몸체부(640)의 상단부는 안전주입탱크(200)의 냉각수의 배출 한계 수위인 고갈경보선과 같거나, 고갈경보선보다 낮은 위치에 형성한다. 볼밸브몸체부(640)의 상단부가 고갈경보선보다 높은 위치에 형성될 경우, 냉각수 수위에 맞춰 하강하는 부유체(510)가 고갈경보선에 도달하여 볼밸브(600)가 차단되기 전에 볼밸브 내에는 가압가스가 공급될 수 있기 때문이다. The upper end of the ball valve body 640 is formed at a position equal to or lower than the depletion alarm line, which is the discharge limit level of the coolant of the safety injection tank 200. When the upper end of the ball valve body 640 is formed at a position higher than the depletion alarm line, the floating body 510 descending in accordance with the coolant level reaches the depletion alarm line, and before the ball valve 600 is blocked, This is because pressurized gas can be supplied.

볼밸브(600)에는 볼밸브(600)가 개방 및 폐쇄되는 위치의 범위 내에서만 회전할 수 있도록 볼밸브의 몸체부에는 축부(530)의 이동범위를 제한하는 멈춤쇠(미도시)가 포함될 수 있다. The ball valve 600 may include a detent (not shown) limiting the movement range of the shaft part 530 in the body of the ball valve so that the ball valve 600 can rotate only within the range of the open and closed positions. have.

안전주입탱크(200)와 축부는, 부유체(510)가 가장 높은 위치일 때와 고갈경보선 인접에서의 위치는 회전반경으로 90°가 될 수 있도록 형성하여야 볼밸브(600)의 개방과 폐쇄의 상태가 명확히 구분될 수 있다. The safety injection tank 200 and the shaft portion should be formed so that when the floating body 510 is at the highest position and the position near the depletion alarm line is 90° with a rotation radius, the ball valve 600 is opened and closed. The state of can be clearly distinguished.

이상에서와 같이, 본 발명의 안전주입탱크(200)는 비상 상황 발생 후 냉각수가 고갈경보선에 도달하게 되면, 부력에 의해 부유체(510)가 하강하며 볼밸브(600)를 폐쇄함으로써, 별다른 운전원의 조작이나, 외부 전원 없이도 적절한 시점에 안전주입탱크의 냉각수 공급을 차단되며, 냉각수 배출을 위한 가압가스가 원자로 냉각계통으로 공급되어 원자로의 냉각효율이 낮아지는 것을 방지할 수 있게 된다. As described above, in the safety injection tank 200 of the present invention, when the coolant reaches the depletion alarm line after an emergency situation occurs, the floating body 510 descends by buoyancy and closes the ball valve 600. The supply of cooling water to the safety injection tank is cut off at an appropriate time without the operation of the operator or external power, and the pressurized gas for discharging the cooling water is supplied to the reactor cooling system, thereby preventing the cooling efficiency of the reactor from being lowered.

전술한 실시예들은 본 발명을 설명하기 위한 예시로서, 본 발명이 이에 한정되는 것은 아니다. 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 이로부터 다양하게 변형하여 본 발명을 실시하는 것이 가능할 것이므로, 본 발명의 기술적 보호범위는 첨부된 특허청구범위에 의해 정해져야 할 것이다.The above-described embodiments are examples for explaining the present invention, and the present invention is not limited thereto. Since those of ordinary skill in the art to which the present invention pertains will be able to implement the present invention by various modifications therefrom, the technical protection scope of the present invention should be determined by the appended claims.

Claims (5)

냉각수를 수용하며, 비상시 가압가스의 가압력을 이용하여 상기 냉각수를 원자로 냉각계통으로 공급하는 안전주입탱크에 있어서,
상기 냉각수가 수용되는 수용공간을 형성하는 탱크 본체;
상기 수용공간과 상기 원자로 냉각계통을 연결하는 유출 배관;
상기 유출 배관 상부에 위치하며 상기 유출배관과 연결된 냉각수유로를 형성하는 볼밸브;
상기 냉각수 수위에 따라 상하방향으로 이동하는 부유체; 및
상기 부유체와 상기 볼밸브를 연결하는 축부; 를 포함하며,
상기 부유체가 일정 수준보다 낮아지면 상기 축부의 회전에 의해 볼밸브는 폐쇄되며, 상기 볼밸브 상부와 상기 볼밸브 하부의 연통이 차단되어 상기 냉각수 및 상기 가압가스가 상기 원자로 냉각계통으로 주입되지 않으며,
일측이 상기 탱크 본체에 고정되어 있고 타측이 상기 부유체에 연결되어 있으며, 상기 부유체에 하부방향으로 탄성력을 가하는 탄성체부를 더 포함하는 안전주입탱크.In the safety injection tank that accommodates cooling water and supplies the cooling water to the reactor cooling system by using a pressurized pressure of a pressurized gas in an emergency,
A tank body forming an accommodation space in which the cooling water is accommodated;
An outlet pipe connecting the receiving space and the reactor cooling system;
A ball valve positioned above the outlet pipe and forming a cooling water passage connected to the outlet pipe;
A floating body moving vertically according to the cooling water level; And
A shaft portion connecting the floating body and the ball valve; Including,
When the floating body is lower than a certain level, the ball valve is closed by rotation of the shaft portion, and communication between the upper ball valve and the lower ball valve is blocked so that the cooling water and the pressurized gas are not injected into the reactor cooling system,
The safety injection tank further comprises an elastic body portion fixed to the tank body at one side and connected to the floating body at the other side, and applying an elastic force to the floating body in a downward direction. 제1항에 있어서,
상기 볼밸브는,
일측에서 타측으로 관통하는 유로가 형성된 볼밸브몸체부;
상기 유로 상에 위치하며, 관통부가 형성된 볼 형상의 개폐체;
상기 볼밸브몸체부와 상기 개폐체의 사이에 위치하는 밀봉재; 및
상기 개폐체로부터 연장되어 형성되며, 상기 축부와 연결되는 연결부; 를 포함하여 이루어지는 안전주입탱크.The method of claim 1,
The ball valve,
A ball valve body having a flow path passing through from one side to the other;
A ball-shaped opening and closing body positioned on the flow path and formed with a through portion;
A sealing material positioned between the ball valve body and the opening and closing body; And
A connection part extending from the opening and closing body and connected to the shaft part; Safety injection tank comprising a. 삭제delete 제1항에 있어서,
상기 탄성체부는 탄성력이 상기 부유체의 냉각수에서의 부력에 비해 작도록 형성된 안전주입탱크.The method of claim 1,
The elastic body portion is a safety injection tank formed such that the elastic force is smaller than the buoyancy in the cooling water of the floating body. 제2항에 있어서,
상기 볼밸브몸체부의 상단부는 고갈경보선 이하의 높이에 위치하도록 형성된 안전주입탱크. The method of claim 2,
Safety injection tank formed so that the upper end of the ball valve body is located at a height below the exhaustion warning line.
KR1020190097077A 2019-08-09 2019-08-09 Safety injection tank including ball valve to prevent injection of pressure gas into reactor KR102172838B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002102614A (en) * 2000-09-27 2002-04-09 Nippon Shokubai Co Ltd Valve disc, valve device, tank and method for utilizing them
KR20110008950A (en) 2009-07-21 2011-01-27 한국원자력연구원 Emergency core cooling water safety injection tank for nuclear reactor
JP2014055808A (en) * 2012-09-11 2014-03-27 Toshiba Corp Nuclear reactor water injection system
KR101525322B1 (en) 2013-11-27 2015-06-03 한국원자력연구원 Safety injection tank having function for delaying gas leakage
KR101644060B1 (en) * 2015-02-10 2016-07-29 한국원자력연구원 Measuring device for micro flow rate and nuclear power plant having the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002102614A (en) * 2000-09-27 2002-04-09 Nippon Shokubai Co Ltd Valve disc, valve device, tank and method for utilizing them
KR20110008950A (en) 2009-07-21 2011-01-27 한국원자력연구원 Emergency core cooling water safety injection tank for nuclear reactor
JP2014055808A (en) * 2012-09-11 2014-03-27 Toshiba Corp Nuclear reactor water injection system
KR101525322B1 (en) 2013-11-27 2015-06-03 한국원자력연구원 Safety injection tank having function for delaying gas leakage
KR101644060B1 (en) * 2015-02-10 2016-07-29 한국원자력연구원 Measuring device for micro flow rate and nuclear power plant having the same

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