CN112071454A - Passive combined heat removal system with integrated heat release trap - Google Patents

Abstract

The invention provides a passive combined heat removal system with an integrated heat release trap. An integrated heat release well is arranged in the middle and lower part of the double-layer coagulation containment interlayer gas space. The integrated heat release well is surrounded by a corrosion-resistant metal plate. The top wall of the integrated heat release trap is provided with at least one set of pipelines and one-way valves connecting the integrated heat release trap and the air space inside the containment, and the integrated heat release trap is connected to the containment for rapid pressure relief system, automatic pressure relief system, passive waste heat discharge system, passive low pressure safety injection system, passive reactor cavity water injection system, filter discharge system. The invention simplifies the arrangement of the nuclear power plant reactor system, reduces the containment volume, and provides a feasible solution for improving the economy and passive safety of an advanced nuclear power plant.

Description

A Passive Combined Heat Removal System with Integrated Heat Release Trap

technical field

The invention relates to a passive safety system in an advanced nuclear power plant, in particular to a passive combined heat removal system with an integrated heat release trap.

Background technique

Since the large-scale commercialization of nuclear energy in the 1960s and 1970s, it has provided human beings with clean and efficient energy for a long time. Due to the potential radioactive risks during the operation of nuclear power plants, their safety has always been highly concerned by people in the industry, especially R&D personnel.

So far, there have been three serious accidents in the field of nuclear energy: one is the Three Mile Island nuclear accident in the United States, the second is the Chernobyl nuclear accident in the Soviet Union, and the third is the Fukushima nuclear accident in Japan. The profound lessons learned from the three nuclear accidents are that human operation errors are likely to cause serious accidents in the reactor; active safety facilities have great potential safety hazards under the condition of a power outage accident in the whole plant. How to use the passive safety system to export the residual heat in the reactor/containment for a long time to enhance the inherent safety of the nuclear power plant and provide sufficient judgment time for the operator's intervention has become one of the focuses of the research and development of the third-generation nuclear power plant.

my country's third-generation nuclear power unit "Hualong No. 1" with completely independent property rights has innovatively introduced the design concept of combining active and passive for potential reactor accidents. In terms of passive safety system, passive safety injection system, passive residual heat discharge system and passive reactor cavity water injection system are provided for the main coolant circuit and the secondary side. For the last safety barrier of the nuclear power plant, the double-layer concrete containment is equipped with a passive containment heat transfer system. The coordinated operation of these systems can effectively resist the power failure of the whole nuclear power plant and provide the operator with 72 hours of non-intervention time.

Regarding advanced nuclear energy technology, existing invention patents disclose some passive safety systems. Among them, the patents with publication numbers CN111128414A and CN111383782A provide several passive safety systems, including passive containment heat removal systems, secondary side passive residual heat removal systems, and passive safety injection systems, etc. The authorization number is CN209149827U, the publication number A passive secondary side waste heat discharge system is provided for the patent CN110021447A, and the patents with publication numbers CN110400644A and CN106024077A respectively disclose a passive containment heat discharge system. The feature of these patents is that they mainly focus on the layout of each passive system, and do not consider the relationship between different passive safety systems in the design. Typically, different passive safety systems have their own heat sinks, which leads to the need to arrange multiple cooling water tanks/water storage tanks at different spatial positions inside/outside of the containment, which is not conducive to the simplification of the complex circuit of the nuclear power plant. Reduction in construction costs.

In terms of the heat dissipation of the containment, according to the development process of the accident, there will be two pressure peaks in the air space inside the containment. The second pressure peak is the second pressure peak formed during the long-term cooling process after the core is submerged. Regarding the solution for the pressure relief of the containment gas space, the published patents are mainly aimed at the second pressure peak, and there is no effective solution for alleviating the first pressure peak of the containment, mainly by increasing the volume of the containment as much as possible to enhance safety The buffer capacity of the shell gas space, which increases the volume and construction cost of the nuclear power plant containment.

It can be seen that the further development of existing passive safety systems is mainly limited to the following two points: one is how to effectively deal with the first pressure peak of a large breach accident with a small containment volume; the other is how to effectively integrate different Heat sinks for passive systems to simplify system layout and reduce equipment redundancy.

Therefore, it is necessary to invent a passive combined heat removal system with integrated heat release trap to simplify the layout of the reactor system, reduce the volume of the containment, reduce the volume and water capacity of the replacement hot water tank outside the PCS, and ultimately provide an advanced nuclear power plant. The economy and passive safety provide a feasible solution.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a passive combined heat removal system with an integrated heat release trap, which is used to simplify the layout of the nuclear power plant reactor system, reduce the volume of the containment, and improve the economy and passive safety of advanced nuclear power plants. Provide feasible solutions.

The purpose of the present invention is to achieve this: an integrated heat release trap is arranged in the middle and lower part of the double-layer coagulated containment interlayer gas space, and the integrated heat release well is an annular pool surrounded by corrosion-resistant metal plates. The top wall is provided with at least one set of pipelines and one-way valves connecting the integrated heat release trap and the air space inside the containment, and the integrated heat release trap is connected with the containment rapid pressure relief system, automatic pressure relief system, passive Waste heat removal system, passive low pressure safety injection system, passive reactor cavity water injection system, filter discharge system, containment rapid pressure relief system, automatic pressure relief system, passive residual heat discharge system, passive low pressure safety injection system, passive reactor The number of cavity water injection systems, filter and discharge systems, and the number of pipelines and one-way valve groups connecting the integrated heat release trap and the air space inside the containment are the same.

The present invention also includes such structural features:

1. It also includes the passive containment heat export system. The number of passive containment heat export systems and the number of pipelines and one-way valves connecting the integrated heat release trap and the air space inside the containment are the same. The passive containment heat The export system includes heat exchangers respectively arranged in the double-layer coagulation containment interlayer and inside the containment. The inlet end of each heat exchanger is connected with an inlet isolation valve and a cold pipe section, and the outlet end is connected with an outlet isolation valve and a heat pipe. The end of each cold pipe section and the end of the hot pipe section are in communication with the replacement hot water tank outside the containment.

2. The rapid pressure relief system of the containment includes a rapid pressure relief line arranged in the lower water space of the integrated heat release trap, and the inlet end of the quick pressure relief line extends through the inner shell of the double-layer shell into the inner air space of the containment middle.

3. The automatic pressure relief system includes an automatic pressure relief line and an automatic pressure relief valve arranged on the automatic pressure relief line. The inlet end of the automatic pressure relief line is communicated with the air chamber of the regulator located on the main coolant circuit, and the outlet end Protrudes into the lower water space of the integrated heat trap.

4. The passive waste heat removal system is arranged on the main coolant circuit of the reactor, including the inlet pipeline, the passive waste heat removal heat exchanger, and the outlet pipeline connected in sequence. Valves are installed on the inlet pipeline and the outlet pipeline, and the inlet pipeline is connected to the steam generator. The main coolant circuit heat pipe section at the front end of the steam generator, the outlet pipeline is connected to the main coolant circuit cold pipe section at the rear end of the steam generator, and the passive waste heat discharge heat exchanger is immersed in the lower water space of the integrated heat release well.

5. The passive low-pressure safety injection system includes passive low-pressure safety-injection pipeline and one-way valve. The inlet section of the passive low-pressure safety-injection pipeline is located in the lower water space of the integrated heat release trap, and the outlet section is connected to the wall of the reactor pressure vessel. The one-way valve only allows cooling water to flow from the lower water space of the integrated heat trap to the interior of the reactor pressure vessel.

6. The passive reactor cavity water injection system includes the reactor cavity water injection pipeline and one-way water injection valve. The inlet end of the reactor cavity water injection pipeline is immersed in the lower water space of the integrated heat release well, and the outlet end is connected to the outer wall surface of the reactor pressure vessel and the insulation layer. In the interlayer flow channel formed by the wall.

7. The filtration and discharge system includes a primary water washing filtration system and a secondary filtration and discharge system. The primary water washing and filtration system includes a rapid pressure relief line and an integrated heat release trap. One end of the filtering and discharging pipeline extends into the upper air space of the containment interlayer, and the other end is connected to the filtering and discharging device.

Compared with the prior art, the beneficial effects of the present invention are:

1) The integrated heat release trap designed in the present invention makes full use of the large space volume of the interlayer area of the double-layer concrete containment. This compact layout scheme can avoid the replacement of the material water tank and the passive reactor cavity in the air space arrangement inside the containment. Many cooling water sources such as water injection tanks can effectively simplify the layout of the reactor system on the basis of ensuring the inherent safety of the reactor.

2) The containment rapid pressure relief system composed of the containment rapid pressure relief pipeline and the integrated heat release trap can effectively resist the first pressure peak formed in the containment under the condition of the large reactor rupture accident, thus avoiding the existing third pressure. In the generation of pressurized water reactor nuclear power technology, by maximizing the volume of the containment to alleviate the shortage of pressure peaks, it is helpful to greatly reduce the volume of the containment and reduce the construction cost of the containment.

3) The integrated heat release trap located in the interlayer area of the double-layer concrete containment can provide sufficient cooling water source for the automatic pressure relief system, passive residual heat removal system, passive low-pressure safety injection system, and passive reactor cavity water injection system. Sufficient cooling water in the heat release trap can effectively reduce the volume and water storage capacity of the PCS external water tank. In addition, the combination of the compact integrated heat release trap and various passive heat removal systems can improve the economy of the nuclear power plant on the basis of ensuring the safety of the nuclear power plant.

4) The containment built-in PCS heat exchanger and the containment interlayer PCS heat exchanger set in the passive containment heat export system can effectively deal with various accident conditions. Under the accident conditions on the secondary side of the steam launcher, the containment PCS interlayer heat exchanger can be combined with the passive waste heat removal system to discharge the heat in the reactor. Under the condition of breach accident, the combined effect of the built-in PCS heat exchanger in the containment, the PCS interlayer heat exchanger in the containment and the rapid pressure relief system of the containment can effectively cope with the two pressure peaks in the containment.

5) By setting the connecting pipeline and one-way valve leading to the upper gas space of the containment interlayer on the top wall of the heat-releasing trap gas space, and setting the connecting pipeline and one-way valve leading to the inner gas space of the containment in the upper gas space of the containment interlayer The valve can effectively balance the pressure between the integrated heat release trap, the interlayer gas space of the containment, and the gas space inside the containment on the basis of ensuring the passive safety function of each system.

6) The primary water washing filtration system composed of the rapid pressure relief pipeline of the containment and the integrated heat release trap water space can realize the residence of most water-soluble radioactive substances during operation, which can effectively reduce the filtration of the secondary filtration discharge device. load.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

2 is a schematic diagram of a series operation mode of the present invention;

FIG. 3 is a schematic diagram of the single-circuit independent operation of the present invention.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Since different passive systems in the existing passive safety system design scheme of nuclear power plants have their own cooling water tanks/heat sinks, this is not conducive to the simplification of system equipment in the containment, and the space inside the containment is not fully utilized. In addition, the existing passive heat transfer systems for containment are mainly used to relieve the second pressure peak in the containment under the condition of a breach accident, but there is no effective solution for mitigating the first pressure peak. The invention is based on the large available space in the interlayer of the double-layer concrete containment, and an integrated heat release trap is arranged in the interlayer gas space, which can provide cooling water sources for multiple passive safety systems, thereby helping to simplify the system layout. The rapid pressure relief system of the containment composed of the rapid pressure relief pipeline and the integrated heat release trap can effectively resist the first pressure peak in the containment under the rupture accident, which can significantly reduce the volume of the containment and reduce the construction cost of the nuclear power plant.

The invention provides a passive combined heat removal system with an integrated heat release trap, including an integrated heat release well, a rapid pressure relief system for a containment, an automatic pressure relief system, a passive residual heat discharge system, a passive low-pressure safety injection system, a non-active It consists of an active reactor cavity water injection system, a passive containment heat transfer system (PCS) and a filter discharge system.

The integrated heat release trap is located in the middle and lower part of the double-layer coagulated containment interlayer gas space 1, and is specifically a large-scale annular pool surrounded by stainless steel plates or other corrosion-resistant metal plates 2. The interior is divided into an upper gas space 3 and a The lower water space 4, the top wall surface 5 of the upper gas space 3 of the heat release trap is provided with a communication pipeline 7 and a one-way valve 8 leading to the upper gas space 6 of the containment interlayer, and the inner containment of the upper gas space 6 of the containment interlayer is provided. The wall surface 9 is provided with a communication line 11 and a one-way valve 12 leading to the air space 10 inside the containment. The connecting line 7 and the one-way valve 8 at the top of the gas space only allow the gas to be discharged from the integrated heat trap gas space 3 to the upper gas space 6 of the containment interlayer, and the connecting line 11 and the one-way valve located in the upper gas space 6 of the containment interlayer 12 Only the gas is allowed to be discharged from the containment interlayer gas space 6 to the containment inner gas space 10 .

The rapid pressure relief system of the containment is composed of a rapid pressure relief line 13 and an integrated heat release trap. The inlet end of the pressure relief line 13 is located in the inner air space 10 of the containment, and the pipeline passes through the inner containment wall and extends into the integrated heat release. Trap gas space, the outlet end is located in the lower water space 4 of the integrated heat release trap.

The automatic pressure relief system is composed of an automatic pressure relief line 14, an automatic pressure relief valve 15 and an integrated heat release trap. The inlet end of the automatic pressure relief line 14 is connected to the air chamber 16 of the pressure regulator, and the outlet end is located in the integrated heat release trap. Lower water space 4. It can also be described as follows: the inlet end of the pressure relief line is connected to the top of the reactor regulator and communicated with the inner air cavity of the pressure regulator, the outlet end extends into the integrated heat release trap and is immersed in the internal water space, and the automatic pressure relief valve is installed in the pressure relief line. Controlled by the reactor accident alarm signal.

The passive waste heat removal system is preferably arranged in the reactor main coolant circuit 17, and consists of an inlet pipeline 18, a valve 19, a passive waste heat removal heat exchanger 20, an outlet pipeline 21 and a valve 22, and the inlet pipeline is located in the steam generator. The heat pipe section of the main coolant circuit at the front end, the outlet pipeline is located in the cold pipe section of the main coolant circuit at the rear end of the steam generator, and the passive waste heat discharge heat exchanger is immersed in the internal water space of the integrated heat release trap, specifically: the inlet line 18 is connected to the The primary side cooling water circuit heat pipe section 23 and the outlet pipeline 21 are connected to the primary side cooling water circuit cold pipe section 24 . The passive waste heat removal system described can also be applied to the secondary side of the steam generator in a similar arrangement.

The passive low pressure safety injection system is composed of an integrated heat release trap, a passive low pressure safety injection pipeline 25 and a one-way valve 26. The inlet section of the passive low pressure safety injection pipeline 25 is located in the integrated heat release well water space 4, and the passive low pressure safety injection pipeline 25 is located in the water space 4 of the integrated heat release well. The outlet section of the low-pressure safety injection line 25 is connected to the wall of the reactor pressure vessel 27 , and the one-way valve 26 only allows cooling water to flow from the integrated heat trap water space 4 to the interior of the reactor pressure vessel 27 .

The passive reactor cavity water injection system is composed of an integrated heat release well, a reactor cavity water injection pipeline 28 and a one-way water injection valve 29. The inlet end of the reactor cavity water injection pipeline 28 is immersed in the integrated heat release well water space 4, and the outlet end is connected to the integrated heat release well water space 4. Inside the interlayer flow channel 32 formed by the outer wall surface 30 of the reactor pressure vessel and the inner wall surface 31 of the thermal insulation layer.

The passive containment heat export system includes a replacement hot water tank 33 outside the containment, a cold pipe section 34, a containment interlayer PCS heat exchanger 35, a containment built-in PCS heat exchanger 36, a heat pipe section 37, and an inlet isolation valve 38. , outlet isolation valve 39. The PCS heat exchanger 36 inside the containment and the PCS heat exchanger 35 in the containment interlayer can form a parallel operation mode or a series operation mode with the PCS cold pipe section 34 and the heat pipe section 37 . The built-in PCS heat exchanger 36 in the containment can form a single loop with the cold and heat pipe sections 34 and 37 to operate independently, or can form a dual loop combined operation with the containment interlayer heat exchanger 35 .

The described filter and discharge system is composed of the containment rapid pressure relief line 13, an integrated heat release trap, a filter discharge valve 40, a filter discharge line 41 and a filter discharge device 42, wherein the inlet end of the filter discharge line 41 extends into the containment interlayer. The upper air space 6 is connected to the filter discharge device 42 at the other end. The rapid pressure relief line 13 and the integrated heat release trap form a primary water washing filter system. The filter discharge valve 40, the filter discharge pipeline 41 and the filter discharge device 42 form a secondary filter discharge system. .

The invention is mainly used for alleviating the main cooling water circuit rupture accident, the main steam pipeline rupture accident, the secondary side water supply accident of the steam generator and the like that may occur during the operation of the nuclear power plant. In the event of a water loss accident in the reactor, especially a small breach accident, the reactor main coolant circuit needs to be rapidly depressurized so that the external cooling water can be passively injected into the reactor main coolant circuit 17 under low pressure conditions. Under such accident conditions, the automatic pressure relief system located on the upper part of the main coolant circuit regulator 43 starts operation. Under the action of the accident trigger signal, the automatic pressure relief valve 15 is opened, and the high-temperature steam in the gas space 16 of the pressurizer passes through the pressure relief line 14 into the integrated heat release water space 4 to complete the pressure relief process of the main coolant circuit. The large amount of cooling water in the integrated heat release trap can effectively accommodate the energy released by the automatic pressure relief process. When the pressure in the reactor main coolant circuit 17 is reduced to near normal pressure, the passive low-pressure safety injection system starts to operate, and the cooling water in the integrated heat release trap water space 4 is passed into the reactor pressure vessel 27 through the low-pressure safety injection line 25 to Make sure the reactor core is submerged.

Under the condition of a fusion reactor accident, the passive reactor cavity water injection system starts operation, the one-way valve 29 is automatically opened, and the cooling water in the integrated heat release well water space 4 flows through the reactor cavity water injection pipeline 29 into the pressure vessel outer wall 30 and the thermal insulation In the interlayer flow channel 32 formed by the inner wall surface 31 of the layer, the pressure vessel 27 is cooled to prevent it from melting through.

When the steam generator 44 breaks the main steam pipe or the water supply system works abnormally, the secondary side of the steam generator will lose the heat removal capability. In order to ensure the effective heat dissipation of the main cooling water circuit 17 of the reactor under such accident conditions, the passive waste heat removal system provided in the present invention starts to operate. The isolation valves 19 and 22 of the passive waste heat removal system are automatically opened under the trigger of the accident signal, and the coolant in the heat pipe section 23 of the main cooling water circuit of the reactor enters the heat exchanger 20 of the passive waste heat removal system through the inlet pipeline 18, and passes through the outlet pipeline after cooling. 21 returns to the main coolant circuit 17 . Among them, the heat exchanger 20 of the passive waste heat removal system is immersed in the water space 4 of the integrated heat release trap, and a sufficient amount of water in the integrated heat release well can provide a long-term heat sink for the operation of the passive waste heat extraction system.

When a large breach water loss accident occurs in the reactor, a large amount of high-temperature steam will be ejected into the containment gas space 10, resulting in an increase in the pressure in the containment. According to the development process of the accident, there will be two pressure peaks in the gas space inside the containment. One is the first pressure peak with higher amplitude formed in the containment within a few tens of seconds in the initial stage of the burst ejection, and the other is the core. The second pressure peak formed during long-term cooling after re-submersion.

The present invention alleviates the first pressure peak by means of a rapid pressure relief system consisting of a rapid pressure relief line 13 and an integrated heat release trap. Under the condition of a large breach of water loss accident, the high-pressure steam-air mixed gas in the containment 10 will enter the integrated heat release water space 4 through the rapid pressure relief line 13, and the cooling water will condense the steam in the mixed gas to effectively relieve the containment. The first pressure peak. In order to balance the pressure between the integrated heat release trap and other gas areas during the long-term development of the accident, the top wall 5 of the heat release trap gas space 3 is provided with a communication pipeline 7 and a one-way valve 8 leading to the upper gas space 6 of the containment interlayer, On the inner containment wall surface 9 of the upper air space 5 of the containment interlayer, a communication pipeline 11 and a one-way valve 12 leading to the air space 10 inside the containment are provided.

For the second pressure peak, the present invention provides a replacement hot water tank 33 outside the containment, a cold pipe section 34, a PCS heat exchanger 35 in the containment interlayer, a PCS heat exchanger 36 inside the containment, a heat pipe section 37, and an inlet isolation valve. 38. Passive containment heat export system composed of outlet isolation valve 39. Among them, the heat exchanger 36 in the containment is arranged in the air space 10 inside the containment, the PCS interlayer heat exchanger 35 in the containment is arranged in the interlayer air space 6 between the inner containment 9 and the outer containment 45, and the PCS heat exchanger is built in the containment. Heater 36 and containment interlayer PCS heat exchanger 35 may form parallel operation mode (as shown in FIG. 1 ) or series operation mode (as shown in FIG. 2 ) with PCS cold and heat pipe sections 34 and 37 . The PCS heat exchanger 36 built into the containment can form a single loop with the cold and heat pipe sections 34 and 37 to operate independently (as shown in Figure 3), or it can form a dual-circuit combined operation with the containment interlayer heat exchanger 35 (as shown in Figure 1).

During the long-term development of the accident, during the pressurization stage of the containment gas space 10 , the PCS heat exchanger 36 built into the containment relieves the pressure increase in the containment by condensing the steam in the containment gas space 10 . Under the action of the higher pressure of the containment gas space 10 , the gas enters the integrated heat release trap water space 4 through the rapid pressure relief line 13 . When a certain pressure difference is formed between the integrated heat release trap gas space 3 and the containment interlayer gas space 6, the mixed gas in the gas space enters the containment interlayer gas space through the communication pipeline 7 and the one-way valve 8 on the top wall of the heat release trap gas space 3 6. The carried heat is exported through the containment interlayer PCS heat exchanger 35 .

During the depressurization stage of the containment gas space 10, the pressure of the containment interlayer gas space 6 is relatively high. When a certain pressure difference is formed between the gas space 6 of the containment interlayer and the gas space 10 inside the containment, the gas in the interlayer of the containment is discharged to the gas inside the containment through the communication pipeline 11 and the one-way valve 12 of the gas space 6 in the upper part of the containment interlayer. Space 10. In the same way, under the action of a certain pressure difference, the gas in the integrated heat release trap gas space 3 enters the containment interlayer gas space 6 through the communication pipeline 7 and the one-way valve 8 located on the top wall of the integrated heat release trap gas space 3, and finally. The pressure balance between the containment interlayer gas space 6 and the containment inner gas space 10 is achieved.

When the pressure inside the containment gas space 10 is too high under unexpected accident conditions, the filter discharge valve 40 is opened under the trigger of the containment high pressure signal, and the containment filter discharge system starts to operate. The high-temperature and high-pressure gas with radioactive substances inside the containment gas space 10 first enters the first-stage water washing filtration system composed of the rapid pressure relief line 13 and the integrated heat release trap. This process makes most of the water-soluble radioactive substances reside in the integrated Heat trap water space 4. After the first-stage water washing and filtration, the mixed gas enters the containment interlayer gas space 6 through the connecting line 7 and the one-way valve 8 located on the top wall surface 5 of the integrated heat release trap gas space 3, and then enters the filtration and discharge device 42 through the filter discharge line 41, The radioactively filtered gas is finally released to the outside environment.

To sum up, the purpose of the present invention is to provide a passive combined heat removal system with an integrated heat release trap, which mainly consists of an integrated heat release well, a rapid pressure relief system for a containment, an automatic pressure relief system, a passive residual heat discharge system, It consists of passive low pressure safety injection system, passive reactor cavity water injection system, passive containment heat transfer system (PCS) and filter discharge system. As the key cold source in various reactor accidents, the integrated heat trap is arranged in the middle and lower part of the annular interlayer of the double-layer concrete containment, surrounded by stainless steel plates to form a large-scale annular pool, and the interior is divided into a lower water space and an upper air space. In the event of a water loss accident in the reactor and the failure of the secondary side of the steam generator, the integrated heat release trap can provide a heat release heat sink for the heat exchanger of the automatic pressure relief system and the passive waste heat removal system, and provide a heat sink for the passive low pressure safety injection system. and passive reactor cavity water injection system to provide sufficient cooling water source. Under the severe accident conditions caused by the large break water loss accident, the integrated heat release trap combined with the rapid pressure relief line of the containment can effectively resist the first pressure peak in the containment, and the combination with the PCS system and the filter discharge device can effectively relieve the containment within the second pressure peak and achieve radioactive residency. The design of the integrated heat trap makes full use of the interlayer space of the double-layer concrete containment, which can provide sufficient cold source for various passive safety systems, which will help to greatly reduce the volume of the containment gas space and reduce the replacement of hot water outside the PCS. The volume of the tank and the amount of water in the tank provide a feasible solution for improving the economy and passive safety of advanced nuclear power plants.

Claims (8)

1. a passive combined heat removal system with integrated heat release trap is characterized in that: an integrated heat release well is provided in the middle and lower part of the double-layer coagulated containment interlayer gas space, and the integrated heat release well is made of corrosion-resistant An annular pool surrounded by metal plates, the top wall of the integrated heat trap is provided with at least one set of pipelines and one-way valves connecting the integrated heat trap and the air space inside the containment, the integrated heat trap is connected to the containment Rapid pressure relief system, automatic pressure relief system, passive residual heat discharge system, passive low pressure safety injection system, passive reactor cavity water injection system, filter discharge system, containment rapid pressure relief system, automatic pressure relief system, passive residual heat discharge The number of systems, passive low-pressure safety injection systems, passive reactor cavity water injection systems, filter and discharge systems, and the number of pipelines and one-way valve groups connecting the integrated heat release trap and the air space inside the containment are the same. 2. a kind of passive combined heat removal system with integrated heat release trap according to claim 1, it is characterized in that: also comprise passive containment heat exporting system, the quantity and communication integration of passive containment heat exporting system The heat release trap has the same number of pipelines and one-way valves as the air space inside the containment. The passive containment heat transfer system includes heat exchangers respectively arranged in the double-layer coagulation containment interlayer and inside the containment. , the inlet end of each heat exchanger is connected with an inlet isolation valve and a cold pipe section, the outlet end is connected with an outlet isolation valve and a hot pipe section, and the end of each cold pipe section and the end of the hot pipe section are replaced with the hot water tank outside the containment Connected. 3. A passive combined heat removal system with integrated heat release trap according to claim 1 or 2, characterized in that: the containment rapid pressure relief system comprises a rapid pressure relief system arranged in the lower water space of the integrated heat release well The inlet end of the pressure relief line and the quick pressure relief line extends through the inner shell of the double shell into the inner air space of the containment. 4. A passive combined heat removal system with integrated heat release trap according to claim 3, characterized in that: the automatic pressure relief system comprises an automatic pressure relief pipeline and an automatic pressure relief valve arranged on the automatic pressure relief pipeline , the inlet end of the automatic pressure relief line is communicated with the air cavity of the pressure regulator on the main coolant circuit, and the outlet end extends into the lower water space of the integrated heat release trap. 5. A passive combined heat removal system with integrated heat release trap according to claim 1 or 4, characterized in that: the passive waste heat removal system is arranged on the main coolant circuit of the reactor, and comprises inlet pipelines connected in sequence , Passive waste heat discharge heat exchanger, outlet pipeline, valves are installed on the inlet pipeline and outlet pipeline, the inlet pipeline is connected to the heat pipe section of the main coolant circuit at the front end of the steam generator, and the outlet pipeline is connected to the main coolant circuit at the back end of the steam generator In the cold pipe section, the passive waste heat discharge heat exchanger is immersed in the lower water space of the integrated heat release well. 6. A passive combined heat removal system with integrated heat release trap according to claim 5, characterized in that: the passive low pressure safety injection system comprises passive low pressure safety injection pipelines and a one-way valve, and the passive low pressure safety injection system The inlet section of the injection line is located in the lower water space of the integrated heat release trap, the outlet section is connected to the wall of the reactor pressure vessel, and the one-way valve only allows cooling water to flow from the lower water space of the integrated heat release trap to the inside of the reactor pressure vessel. 7. A passive combined heat removal system with integrated heat release trap according to claim 1 or 6, characterized in that: the passive reactor cavity water injection system comprises a reactor cavity water injection pipeline, a one-way water injection valve, and the reactor cavity water injection The inlet end of the pipeline is immersed in the lower water space of the integrated heat release well, and the outlet end is connected to the interlayer flow channel formed by the outer wall surface of the reactor pressure vessel and the inner wall surface of the thermal insulation layer. 8 . The passive combined heat removal system with integrated heat release trap according to claim 7 , wherein the filtering and discharging system comprises a primary water washing filtering system and a secondary filtering discharging system, and the primary water washing filtering system comprises Rapid pressure relief line, integrated heat release trap, secondary filter discharge system includes filter discharge valve, filter discharge line, filter discharge device, one end of the filter discharge line extends into the upper air space of the containment interlayer, and the other end is connected to the filter discharge device .

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