WO2016011569A1

WO2016011569A1 - Containment cooling system, and containment and reactor pressure vessel joint cooling system

Info

Publication number: WO2016011569A1
Application number: PCT/CN2014/001003
Authority: WO
Inventors: 孙中宁; 范广铭; 丁铭; 阎昌琪; 王建军; 曹夏昕; 谷海峰; 张楠
Original assignee: 哈尔滨工程大学; 孙中宁
Priority date: 2014-07-24
Filing date: 2014-11-13
Publication date: 2016-01-28
Also published as: JP6277322B2; KR102085983B1; KR20170039083A; JP2017521674A; CN106104701A; CA2954136C; CA2954136A1; CN106104701B

Abstract

Provided are a containment cooling system, and a containment and reactor pressure vessel joint cooling system, wherein the containment cooling system is mainly formed by connecting an internal heat exchanger (1), a rising pipeline (2), a falling pipeline (3), isolation valves (4, 5), a cooling water tank (6) and air cooling condenser-cooler (7). The containment and reactor pressure vessel joint cooling system comprises the containment cooling system and a reactor pressure vessel cooling system. The cooling system does not need to be provided external power, and can provide long-term effective cooling for a containment and reactor pressure vessel at the same time in the case of an accident, thereby ensuring that when an accident occurs, under the condition of having no human intervention and the input of other external cooling measures, a reactor containment and a pressure vessel are always in a safe state.

Description

Containment cooling system and cofferdam and reactor pressure vessel combined cooling system

Technical field

The invention relates to a containment cooling system, and the invention also relates to a combined cooling system of a safety shell and a reactor pressure vessel, belonging to the technical field of nuclear safety and thermal hydraulics.

Background technique

Both the containment and the reactor pressure vessel are important safety barriers against the leakage of radioactive materials in the event of an accident at the nuclear power plant. In the event of a serious accident such as LOCA or MSLB, the containment will rapidly increase the temperature and pressure in the shell due to the rapid filling of a large amount of steam. Once the temperature and pressure exceed the designed allowable range, the containment may be damaged and the radioactive material may be leaked. At the same time, the core has a significant drop in cooling capacity due to severe water loss. Once the core melts, the melt may collapse to the lower head of the pressure vessel. If the lower head is melted through excessive heat load, it will be a serious threat. The integrity of the containment causes leakage of the core melt. Therefore, in order to ensure the safety of nuclear power plants, it is necessary to set up a special system for cooling the containment and reactor pressure vessels.

At present, some cooling system designs have been proposed for double-layer concrete containment and reactor pressure vessels.

The solution proposed for the concrete containment is mainly to internally set up the heat exchanger. The height difference between the external water tank and the internal heat exchanger is used to derive heat in a natural circulation manner, but at the same time, the water in the water tank is largely evaporated. (C S Byun, D W Jerng, N E Todreas, et al. Conceptual design and analysis of a semi-passive containment cooling system for a large concrete containment. Nuclear Engineering and Design, 2000, 199: 227-242; S J Cho , B S Kim, M G Kang, et al. The development of passive design features for the Korean Next Generation Reactor. Nuclear Engineering and Design, 2000, 201: 259-271; S W Lee, W P Baek, S H Chang. Assessment of passive containment cooling concepts for advanced pressurized water reactors. Ann. Nucl. Energy, 1997, 24(6): 467-475). It can be seen that there is a major problem in the design of the above-mentioned containment heat-dissipating system, that is, the temperature and pressure of the containment cannot be exceeded for a period of time, and the cooling time is up to 72 hours, exceeding this time limit. The system will fail because the water in the tank is exhausted. After 72 hours, it is necessary to re-water the water tank by external power to make the system work again. To extend the cooling time without any intervention, it can only be achieved by further increasing the volume of the water tank, but the volume of the water tank is increased. It will also greatly increase the impact of the earthquake.

The external cooling system proposed for the reactor pressure vessel adopts both active and passive water injection methods. The technical solutions disclosed in the patent documents such as CN201681637, CN203366760U, CN202887747U, CN103632736A, CN102163469A, CN103310856A, etc. are disclosed. However, the above-described external cooling system has a common disadvantage, that is, the utilization rate of cooling water is relatively low. When the water in the pit is filled, if no one is turning off the pump or passive In the control valve in the system, the water injection system will continue to inject water (whether large or small), causing water to overflow the heap and causing waste. Therefore, in order to ensure sufficient cooling time, the tank of the above-mentioned passive cooling system needs to provide a large amount of water storage without human intervention, which will greatly increase the volume of the water tank. If the water injection flow is small, it may cause the water level in the heap to drop, or even completely inundate the reactor pressure vessel, so that the reactor pressure vessel cannot be sufficiently cooled, thereby threatening the integrity of the reactor pressure vessel. Therefore, if you do not want to cause additional loss of cooling water and provide continuous cooling for the pressure vessel, you need to manually adjust or start the cooling system (whether the active system or the passive system), causing the actual operation of the system. Very difficult.

In addition, the above solutions are proposed only for double-layer concrete containment or reactor pressure vessels, which are independent of each other. However, in severe accidents, it is often necessary to provide both the containment and the reactor pressure vessel cooling. If the two systems operate independently, the condensate produced by the internal heat exchanger will be lost.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a containment cooling system which can achieve long-term cooling in a containment without requiring external power to be supplied and which consumes less cooling water. It is also an object of the present invention to provide a cofferdam and reactor pressure vessel combined cooling system that can provide long-term effective cooling for containment and reactor pressure vessels under accident conditions, keeping the reactor containment and pressure vessels in a safe state at all times. .

The containment cooling system of the present invention comprises an internal heat exchanger, an ascending pipeline, a descending pipeline, an isolation valve, a cooling water tank and an air-cooled condensing-cooler, and the internal heat exchanger is located in the upper space of the inner concrete containment close to the side wall The cooling water tank is located outside the outer concrete containment, the relative position of the cooling water tank is higher than the internal heat exchanger, and the cooling water tank and the internal heat exchanger are connected by the rising pipeline and the descending pipeline to form a closed loop, and the air cooling condensing-cooling The device is a shellless heat exchanger, located inside the cooling water tank, and the air-cooled condensing-cooler is arranged obliquely. The heat transfer tube of the air-cooled condensing-cooler is partially placed in the water space, and the other part is placed in the steam space, and the condensing-cooler air side The inlet is opened at the side of the tank side near the bottom surface, and the lower atmosphere of the air-cooling condensing-cooler is connected through the pipeline. The condensing-cooler air side outlet is opened at the position of the side wall of the tank near the upper surface, and the air-cooled condensation is communicated through the pipeline. - an upper space of the cooler and an annular space formed by the inner concrete containment and the outer concrete containment.

The containment cooling system of the present invention may further comprise:

1. The side wall of the cooling water tank is connected with a water sealing device, and the upper connecting pipe of the water sealing device is connected with the gas space of the cooling water tank, and the lower connecting pipe of the water sealing device is connected with the water space of the cooling water tank, and the upper and lower connecting pipes are connected Pipeline bridging.

2. Internal and external isolation valve sets are provided on both the ascending and descending lines.

The containment and reactor pressure vessel combined cooling system of the present invention comprises a containment cooling system and a reactor pressure vessel cooling system; the containment cooling system includes an internal heat exchanger, an ascending pipeline, a descending pipeline, an isolation valve, and a cooling water tank And an air-cooled condensing-cooler, the internal heat exchanger is located in the upper space of the inner concrete containment close to the side wall, and the cooling water tank is located outside the outer concrete containment, the relative position of the cooling water tank is higher than the internal heat exchanger, the cooling water tank It is connected with the internal heat exchanger through the rising pipeline and the descending pipeline to form a closed loop. The air-cooled condensing-cooler is a shellless heat exchanger, located inside the cooling water tank, the air-cooling condensing-cooler is arranged obliquely, and the air-cooling condensation-cooling One part of the heat transfer tube is placed in the water space, and the other part is placed in the steam space. The air inlet of the condensing-cooler is opened at the side of the tank side near the bottom surface, and the lower atmosphere of the air-cooling condensing-cooler is connected through the pipeline. a condensing-cooler air side outlet opening at a position near the upper surface of the tank, communicating an upper head of the air-cooled condensing-cooler through the pipe, and an annular space formed by the inner concrete containment and the outer concrete containment; The reactor pressure vessel cooling system includes a water storage tank, a pressure equalization pipe, a water injection pipe, an isolation pool, a control valve, a communication pipe, and a condensate collection. a pool, a water storage tank and an exhaust pipe, the water storage tank is located above the isolation pool, and the water storage tank and the isolation pool are connected by a pressure balance pipe and a water injection pipe, and the separation pool and the reactor pit are connected by a communication pipe, the reactor The pressure vessel is located in the reactor pit, and the condensate collection tank is located below the internal heat exchanger, and the condensate collection tank is connected to the water storage tank, the regulating valve and the isolation pool through the pipeline.

The containment and reactor pressure vessel combined cooling system of the present invention may further comprise:

1. The upper end of the pressure balance pipe is located in the gas space of the water storage tank, and the lower end is relatively higher than the upper edge of the reactor pressure vessel.

2. The upper end of the water injection pipe is connected with the lowest point of the water storage tank, and the lower end is opposite to the lower edge of the pressure balance pipe.

3. The water outlet at the lower end of the water injection pipe is "S" shaped.

4. There is a control valve on the water injection pipe.

5. The upper part of the water storage tank is connected to the condensate collecting pool through the exhaust pipe, and the lower part of the water storage tank is provided with a sewage discharge valve.

The invention has the beneficial effects of providing long-term cooling for the containment vessel and the reactor pressure vessel in the event of a serious accident such as LOCA, MSLB, etc., so that the reactor containment vessel and the pressure vessel are always in a safe state. The system can realize: (1) Under accident conditions, the internal heat exchanger and the water tank can directly generate natural circulation through the density difference between the single-phase water and the steam-water mixture without human intervention; (2) air-cooled condensation - The natural circulation of air between the cooler and the external atmosphere can be realized, and the heat in the water tank can be drained in time, which greatly prolongs the running time of the heat exporting system. When the increase value of the heat in the water tank is less than or equal to the heat exchange power of the air-cooled condensing-cooler , the system can achieve long-term cooling inside the containment. (3) Air-cooled condensing-cooler can simultaneously cool the water and steam in the cooling water tank, significantly reduce the consumption of cooling water, increase the utilization rate of cooling water, and greatly reduce the water capacity of the cooling water tank. (4) Air-cooled condensing-cooler can cool the water in the cooling water tank to lower the water temperature, thereby increasing the density difference between the descending pipeline and the rising pipeline, increasing the driving force of the natural circulation, and cooling the internal heat exchanger. The water flow increases and the heat exchange power of the heat exchanger increases, which can more effectively derive the heat inside the containment. (5) The water seal device can be installed to prevent the cooling water tank from being polluted by the external environment. It can also be automatically opened when the pressure in the water tank is high to avoid overpressure damage of the cooling water tank. (6) The external cooling system can realize complete passive operation to flood the pressure vessel, and the water supply can be automatically adjusted by the pressure balance tube without human intervention and adjustment. (7) "S" shape design can effectively prevent two phases of soda Reverse flow occurs to avoid flow oscillations and the water injection flow is stable. (8) The passive non-external cooling system has high utilization rate of cooling water, and there is no waste and waste. Compared with the existing passive technology, the cooling water consumption is significantly reduced under the same cooling time, and the storage is greatly reduced. Water tank capacity. (9) The design of the isolation pool effectively prevents the steam generated by boiling in the pit from flowing back into the water storage tank, ensuring reliable and smooth operation of the system.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a containment cooling system of the present invention.

2 is a schematic view of a combined cooling system of a containment vessel and a reactor pressure vessel of the present invention.

detailed description

The invention will now be described in more detail with reference to the accompanying drawings.

Embodiment 1

1 , the containment cooling system of the present invention is mainly composed of an internal heat exchanger 1, an ascending pipeline 2, a descending pipeline 3, an isolation valve 4, an isolation valve 5, a cooling water tank 6, and an air-cooling condensing-cooler 7. The internal heat exchanger is located in the upper space of the inner concrete containment 12 adjacent to the side wall; the cooling water tank is located outside the outer concrete containment vessel 13, the relative position is higher than the internal heat exchanger, and the internal heat exchanger is respectively raised The pipeline and the descending pipeline are connected to form a closed loop; the air-cooled condensing-cooler is a shellless heat exchanger, which is located inside the cooling water tank, is arranged obliquely, and a part of the heat pipe is placed in the water space, and the other part is placed in the steam space. The water and steam in the cooling water tank significantly reduce the consumption of cooling water, greatly extend the continuous running time of the heat-extracting system, and achieve long-term cooling of the containment; the condensing-cooler air side inlet 9 opens to the bottom side of the tank Position, through the pipeline to communicate the external atmosphere and the lower head of the air-cooled condensing-cooler; the condensing-cooler air side outlet 10 is opened at the position of the side wall of the tank near the upper surface, and the upper head of the air-cooled condensing-cooler is connected through the pipeline And an annular space formed by the inner concrete containment and the outer concrete containment.

The internal heat exchanger uses highly efficient heat transfer tubes, such as outer fin tubes and integral pin fin tubes, to improve heat transfer efficiency; external air condensing-coolers use highly efficient heat transfer tubes, such as inner fin tubes and inner ribs. Pipes, etc., to improve heat transfer efficiency and reduce heat exchanger volume.

Internal and external isolation valve sets 4, 5 are provided on the ascending and descending lines to prevent leakage of radioactive materials from the passive heat transfer system due to pipeline damage.

A water seal device 8 is connected to the side wall of the cooling water tank to isolate the cooling water tank from the external environment during non-operating conditions, thereby preventing the water in the water tank from being contaminated, thereby causing blockage of the pipeline; in the case of an accident, the cooling water tank is working. The mass is heated and the pressure rises, thereby breaking the water seal and allowing the cooling water tank to communicate with the outside atmosphere via the water sealing device. The upper connecting pipe of the water sealing device is in communication with the gas space of the cooling water tank, the lower connecting pipe is connected with the water space of the cooling water tank, and the upper and lower connecting pipes are connected by pipes.

An air outlet 11 is provided above the middle of the outer concrete containment dome to guide the air flow between the double containment chambers, allowing air to flow from the condensing-cooler inlet through the air-cooled condensing-cooler and the air-cooling condensing-cooler outlet After that, it flows out from the air outlet to form a natural circulation of air with the external atmospheric environment, providing sufficient air flow for the air-cooled condensate-cooler.

The containment cooling system of the present invention is a passive containment heat removal system, and its working principle when operating alone is as follows: when the main pipe of the reactor breaks or the main steam pipe is broken, a large amount of steam is released into the containment, and Mix with the air inside the containment to raise the temperature and pressure inside the containment. When the pressure in the containment reaches a certain threshold, the pressure sensor in the containment sends a high voltage signal to the main control room of the power station to activate the containment heat removal system. When the containment heat removal system is started, the water in the cooling water tank flows into the internal heat exchanger 1 from the descending pipeline 3, and is gradually heated and heated, and the water in the descending pipeline and the rising pipeline is naturally circulated depending on the density difference, and The heat inside the containment is introduced into the cooling water tank, so that the temperature in the cooling water tank 6 rises, and the air-cooled condensing-cooler starts to operate, and the air enters the air-cooling condensing-cooler 7 from the condensing-cooler air side inlet 9 to be fully heat-exchanged. The condensate-cooler air side outlet 10 flows out through the annular space of the inner concrete containment 12 and the outer concrete containment 13 and is finally discharged into the atmosphere by the air outlet 11 to achieve natural circulation of air and take away heat in the cooling water tank. .

In the early stage of the accident, due to the large amount of steam discharged into the containment, the temperature inside the containment rises rapidly, and the heat introduced from the internal heat exchanger into the cooling water tank may be higher than the heat transfer power of the air-cooled condensate-cooler 7. The steam is generated in the cooling water tank 6, and the pressure in the water tank rises. When the water tank pressure is higher than the opening pressure of the water sealing device 8, the water sealing device is automatically opened, the cooling water tank 6 is directly discharged to the air, and the water seal is re-established after the pressure is released. , isolating the cooling water tank 6 and the external environment.

In the middle and late stages of the accident, the amount of steam discharged into the containment gradually stabilizes or decreases with time. At this time, the heat of the internal heat exchanger introduced into the cooling water tank will be less than or equal to the heat exchange capacity of the air-cooled condensing-cooler 7, and the air-cooling condensing-cooler 7 effectively cools and condenses the remaining water and the upper steam in the cooling water tank 6. Avoid the loss of cooling water, and thus achieve long-term cooling inside the containment, greatly improving the safety of the containment.

Specific implementation method 2:

2, the combined containment and reactor pressure vessel cooling system of the present invention mainly comprises a containment cooling system and a reactor pressure vessel cooling system. The structure of the containment cooling system is the same as that of the first embodiment.

The reactor pressure vessel cooling system mainly comprises a water storage tank 14, a pressure equalization pipe 15, a water injection pipe 16, an isolation water tank 17,

control valves

18 and 24, a communication pipe 19, a reactor pit 20, a reactor pressure vessel 21, and a condensate. The pool 22, the water storage tank 23, the exhaust pipe 25, and the drain valve 25 are collected. Wherein, the water storage tank is located above the isolation pool, and the two are connected by a pressure balance tube and a water injection pipe, and the isolation pool and the reactor pit are connected by a communication pipe, and the reactor pressure vessel is located in the reactor pit, the condensate collection pool Located under the internal heat exchanger, the water storage tank, regulating valve and isolation pool are connected in turn through the pipeline.

The upper end of the pressure equalization tube is located in the gas space of the water storage tank, and the lower end is relatively higher than the upper edge of the reactor pressure vessel. When the system is in standby state, there is no water in the tube. When an accident occurs, the reactor pressure vessel is always submerged below the water surface.

The upper end of the water injection pipe is connected to the lowest point of the water storage tank, and the lower end is opposite to the lower edge of the pressure balance pipe.

The water outlet at the lower end of the water injection pipe adopts an "S" shape to prevent air from entering the water storage tank from the water injection pipe when the water outlet is exposed to the water surface, thereby causing a gas-liquid two-phase reverse flow state in the pipe, increasing water injection resistance, and causing flow vibration.

The isolation pool is a small pool, and the water in the pool is always kept cold to prevent steam generated from boiling in the reactor pit from entering the storage tank during accident conditions.

The control pipe is provided with a control valve. When the system is in the standby state, the control valve is closed, and the isolation pool is in a waterless state. When an accident occurs, the control valve is opened, water is injected into the isolation pool from the water storage tank, and enters the reactor through the communication pipe. Pile pits, flooding the reactor pressure vessel.

The upper part of the water storage tank is connected with the condensate collecting pool through the exhaust pipe, so that the water in the condensate collecting pool can smoothly flow into the water storage tank to avoid the phenomenon of two-phase reverse flow in the pipeline; the lower part of the water storage tank is provided with a sewage valve. The water can be periodically injected into the condensate collecting pool to flush the condensate collecting pool, the water storage tank and related pipelines, and the water is discharged by the drain valve to ensure smooth circuit and prevent blockage.

The containment cooling system of the present embodiment is a passive containment heat removal system, and the reactor pressure vessel cooling system is a passive external stack cooling system. The passive containment heat removal system and the passive off-site cooling system can be operated in combination or independently. When the passive containment heat removal system is operated independently, the control valve is closed, and the condensate generated by the internal heat exchanger is collected by the condensate collection tank and injected into the storage tank for storage. When the passive containment heat removal system and the passive external stack cooling system are operated in combination, the control valve is opened, and the condensate flows into the isolation pool from the storage tank to participate in the cooling of the reactor pressure vessel, thereby saving the amount of water in the water storage tank. Effectively reduce the volume of the water storage tank.

The working principle of the passive containment heat removal system and the passive external cooling system is as follows: When the reactor main pipe breaks or the main steam pipe breaks, a large amount of steam is released into the containment and the containment The internal air mixes to increase the temperature and pressure inside the containment; at the same time, the core melt may collapse to the lower end of the pressure vessel due to the large amount of water loss in the core, and the lower seal The head is melted through excessive heat loading and may threaten the integrity of the containment. In order to prevent the core melt from passing through the lower head of the pressure vessel, it is necessary to fill the reactor pit 20 with water. At this time, it is necessary to simultaneously activate the passive containment heat removal system and the passive off-site cooling system.

When the system is started, the water in the cooling water tank flows into the internal heat exchanger 1 from the descending pipeline 3, and is gradually heated and heated, and the water in the descending pipeline and the rising pipeline is naturally circulated by the density difference, and the inside of the safety shell is The heat is introduced into the cooling water tank, so that the temperature in the cooling water tank 6 rises, and the air-cooled condensing-cooler starts to operate, and the air enters the air-cooling condensing-cooler 7 from the condensing-cooler air side inlet 9 to be fully condensed and cooled by heat exchange. The air side outlet 10 flows out through the annular space of the inner concrete containment 12 and the outer concrete containment 13 and is finally discharged into the atmosphere by the air outlet 11, thereby achieving natural circulation of the air and taking away the heat in the cooling water tank.

The condensed water generated on the surface of the internal heat exchanger 1 is collected by the condensate collecting tank 22 and flows through the water storage tank 23, the control valve 24, and into the isolation pool 17, and the water flowing in from the water storage tank 14 through the water injection pipe 16 is in the isolation pool. 17 is mixed and used together as cooling water for the reactor pressure vessel 21. When the water level in the isolation pool 17 is higher than the horizontal position of the communication tube 19 at the bottom, the water flows into the reactor pit 20 via the communication tube 19 via the isolation pool 17, and rapidly floods the reactor pressure vessel 21. Since the isolation pool 17 and the reactor pit 20 are of a communicating structure, the water level between the two is balanced. When the water level in the isolation pool 17 has not passed the lower end of the pressure balance pipe 15, the cooling water injected into the isolation pool 17 by the water storage tank 14 is rapidly reduced until it stops.

With the large release of the reactor core decay heat, the surface of the reactor pressure vessel 21 in the high temperature state continues to heat the cooling water in the reactor pit 20, so that the water in the reactor pit 20 is heated until boiling evaporation occurs. At this time, steam is still injected into the containment at the break of the main pipe. After the steam is condensed on the surface of the internal heat exchanger 1, the condensed water is collected by the condensate collecting tank 22 and continuously injected into the reactor pit 20 to cool the surface of the reactor pressure vessel 21, if the amount of condensed water on the surface of the internal heat exchanger 1 is larger than the water storage tank 23, the amount of water injected into the isolation pool 17, the condensed water is stored in the water storage tank 23.

In the early stage of the accident, due to the large amount of steam discharged into the containment, the temperature inside the containment rises rapidly, and the heat introduced from the internal heat exchanger into the cooling water tank may be higher than the heat transfer power of the air-cooled condensate-cooler 7. The steam is generated in the cooling water tank 6, and the pressure in the water tank rises. When the water tank pressure is higher than the opening pressure of the water sealing device 8, the water sealing device is automatically opened, the cooling water tank 6 is directly discharged to the air, and the water seal is re-established after the pressure is released. , isolating the cooling water tank 6 and the external environment. In addition, since the amount of condensed water on the surface of the internal heat exchanger 1 is large (the condensed water mainly comes from the large condensation of the pit evaporation and the rupture steam), the condensed water is continuously injected into the isolation pool 17, ensuring the lower end of the pressure balance pipe 15. It is always submerged, and therefore, the water consumed in the water storage tank 14 is hardly consumed except for being initially injected into the isolation pool 17.

In the middle and late stages of the accident, the amount of steam discharged into the containment gradually stabilizes or decreases with time. At this time, the heat of the internal heat exchanger introduced into the cooling water tank will be less than or equal to the heat exchange capacity of the air-cooled condensing-cooler 7, and the air-cooling condensing-cooler 7 effectively cools and condenses the remaining water and the upper steam in the cooling water tank 6. Avoid the loss of cooling water, and thus achieve long-term cooling inside the containment, greatly improving the safety of the containment. In addition, since the amount of condensed water on the surface of the internal heat exchanger 1 is reduced, if the evaporation amount of water in the reactor pit 20 is larger than the condensate collection amount, the water level is lowered to lower than the lower end of the pressure balance pipe 15 by evaporation, and water is stored. The tank 14 is refilled with water until the lower end of the pressure equalization tube 15 is again submerged. Repeatedly, the reactor pressure vessel 21 is always in a submerged state without human intervention.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A containment cooling system comprising an internal heat exchanger, an ascending pipeline, a descending pipeline, an isolation valve, a cooling water tank and an air-cooled condensing-cooler, wherein the internal heat exchanger is located in the inner concrete containment vessel near the side In the upper space of the wall, the cooling water tank is located outside the outer concrete containment, the relative position of the cooling water tank is higher than the internal heat exchanger, and the cooling water tank and the internal heat exchanger are connected by the rising pipeline and the descending pipeline to form a closed loop. The air-cooled condensing-cooler is a shellless heat exchanger, located inside the cooling water tank, and the air-cooled condensing-cooler is arranged obliquely. The air-cooling condensing-cooler heat transfer tube is partially placed in the water space and the other part is placed in the steam space, and the condensation is performed. The cooler air side inlet is opened at the side of the tank side near the bottom surface, and the lower atmosphere of the air-cooling condensing-cooler is connected through the pipeline, and the air outlet of the condensing-cooler is opened at the position of the side wall of the tank near the upper surface, The pipe is connected to the upper head of the air-cooled condensing-cooler and the annular space formed by the inner concrete containment and the outer concrete containment.
The containment cooling system according to claim 1, wherein the side wall of the cooling water tank is connected with a water sealing device, the upper connecting pipe of the water sealing device is in communication with the gas space of the cooling water tank, and the lower connecting pipe of the water sealing device is The water space of the cooling water tank is connected, and the upper and lower connecting pipes are connected by pipes.
A containment cooling system according to claim 1 or 2, wherein both the up and down lines are provided with internal and external isolation valve sets.
A combined cooling system for a containment vessel and a reactor pressure vessel, comprising: a containment cooling system and a reactor pressure vessel cooling system; the containment cooling system comprising an internal heat exchanger, an ascending pipeline, a descending pipeline, and an isolation valve a cooling water tank and an air-cooled condensing-cooler, the internal heat exchanger is located in an upper space of the inner concrete containment close to the side wall, and the cooling water tank is located outside the outer concrete containment, and the relative position of the cooling water tank is higher than the internal heat exchanger The cooling water tank and the internal heat exchanger are connected by an ascending pipeline and a descending pipeline to form a closed loop. The air-cooled condensing-cooler is a shellless heat exchanger, located inside the cooling water tank, and the air-cooling condensing-cooler is arranged obliquely, and air cooling One part of the heat transfer tube of the condensing-cooler is placed in the water space, and the other part is placed in the steam space. The air inlet of the condensing-cooler is opened at the side of the tank side near the bottom surface, and the external atmospheric environment and the air-cooled condensing-cooler are connected through the pipeline. Lower head, condensing-cooler air side outlet opening to the side of the tank side near the upper surface, air cooling through the pipe An upper head of the condensing-cooler and an annular space formed by the inner concrete containment and the outer concrete containment; the reactor pressure vessel cooling system comprises a water storage tank, a pressure balance pipe, a water injection pipe, an isolation pool, a control valve, a connecting pipe, a condensate collecting pool, a water storage tank and an exhaust pipe, the water storage tank is located above the isolation pool, and the water storage tank and the isolation pool are connected by a pressure balance pipe and a water injection pipe, and between the isolation pool and the reactor pit The reactor pressure vessel is located in the reactor pit, and the condensate collecting tank is located below the internal heat exchanger. The condensate collecting tank is connected to the water storage tank, the regulating valve and the isolation pool through the pipeline.
The combined containment and reactor pressure vessel cooling system according to claim 4, wherein the upper end of the pressure equalization pipe is located in the gas space of the water storage tank, and the lower end is at a higher position than the upper edge of the reactor pressure vessel.
The containment and reactor pressure vessel combined cooling system according to claim 4, wherein the upper end of the water injection pipe is connected to the lowest point of the water storage tank, and the lower end is located lower than the lower edge of the pressure balance pipe.
The combined containment and reactor pressure vessel cooling system according to claim 4, wherein the water outlet of the lower end of the water injection pipe has an "S" shape.
The containment and reactor pressure vessel combined cooling system according to claim 4, wherein the water injection pipe is provided with a control valve.
The combined containment and reactor pressure vessel cooling system according to claim 4, wherein the upper portion of the water storage tank is connected to the condensate collecting pool through the exhaust pipe, and the lower portion of the water storage tank is provided with a drain valve.