CN111916234A - Passive and active combined nuclear power plant safety injection system and using method thereof - Google Patents
Passive and active combined nuclear power plant safety injection system and using method thereof Download PDFInfo
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- CN111916234A CN111916234A CN202010812480.7A CN202010812480A CN111916234A CN 111916234 A CN111916234 A CN 111916234A CN 202010812480 A CN202010812480 A CN 202010812480A CN 111916234 A CN111916234 A CN 111916234A
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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
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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
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a passive and active combined nuclear power plant safety injection system and a using method thereof, wherein the system comprises a high-pressure safety injection water tank, a medium-pressure safety injection water tank and a low-pressure safety injection system which are arranged in a containment vessel; the high-pressure safe injection water tank is filled with water and is communicated with a reactor coolant system through a balance pipeline and an injection pipeline; the medium-pressure safe injection water tank is filled with certain compressed nitrogen, is arranged higher than the reactor core and is connected with a reactor coolant system through an injection pipeline; the low-pressure safe injection system adopts a low-pressure safe injection pump to take water from a pile pit reservoir and inject the water into a reactor coolant system. The invention can realize the comprehensive coverage of different pressure range requirements such as high pressure, medium pressure, low pressure and the like, realize the diversity and reliability of the safety injection function, realize the simplified arrangement of the system structure and improve the safety and the economical efficiency of the nuclear power plant.
Description
Technical Field
The invention relates to the technical field of nuclear power plant safety design, in particular to a nuclear power plant safety injection system combining passive and active and a using method thereof.
Background
After a reactor coolant pipeline break accident (LOCA) occurs in a pressurized water reactor nuclear power plant, reactor coolant is lost from a pressure vessel, so that fuel elements of a reactor core lose the coolant and are burnt, and the safety performance of the reactor is further threatened. Therefore, a set of safety injection system is needed to be arranged for the LOCA accident so as to solve the problem of coolant loss in the LOCA accident process, maintain the coolant loading of the reactor, guarantee the coolability of the reactor core fuel elements and guarantee the safety of the reactor.
Disclosure of Invention
In order to solve the problem of coolant loss in the LOCA accident process and guarantee the safety of a reactor, the invention provides a nuclear power plant safety injection system combining passive and active.
The invention is realized by the following technical scheme:
a nuclear power plant safety injection system combining passive and active comprises a high-pressure safety injection water tank, a medium-pressure safety injection water tank and a low-pressure safety injection system, wherein the high-pressure safety injection water tank, the medium-pressure safety injection water tank and the low-pressure safety injection system are arranged in a containment;
the high-pressure safety injection water tank is filled with water, is communicated with a reactor coolant system through a balance pipeline and an injection pipeline, is arranged higher than the reactor core, and injects the water in the water tank into the reactor core based on the height difference and the density difference;
the medium-pressure safe injection water tank is filled with certain compressed nitrogen, is arranged at a position higher than the reactor core, is connected with a reactor coolant system through an injection pipeline, and injects water in the water tank into the reactor core based on the compressed nitrogen and the height difference;
the low-pressure safe injection system adopts a low-pressure safe injection pump to take water from a pile pit reservoir and inject the water into a reactor coolant system.
The design of combining passive and active is adopted, the characteristics of high density difference and high driving head of the passive safety injection system under the high temperature and high pressure of the reactor coolant system are fully exerted, and the requirement on a high-pressure safety injection pump is eliminated; the stable and controllable characteristics of the active safety injection system under the low-pressure working condition are fully exerted, and the problem that the driving force of the passive system is insufficient at low temperature and low pressure is avoided.
Preferably, the low pressure safety syringe system of the present invention uses a pump drive to provide the driving force. The low-pressure safe injection system comprises a low-pressure safe injection pump and a pit-piling water reservoir;
the low-pressure safe injection pump is used for providing power drive for low-pressure safe injection, a pump suction inlet is arranged at the bottom of the pile pit reservoir, and a pump outlet is connected with a reactor coolant system through an injection pipeline;
the stack pit reservoir provides a water source for low-pressure safe injection and is arranged at the bottom of the stack pit.
Preferably, the invention improves the controllability of the safety injection system by arranging redundant isolation valves on the high, medium and low pressure safety injection lines. The invention also comprises a balance pipeline isolation valve, a high-pressure injection pipeline isolation valve, a medium-pressure injection pipeline isolation valve and a low-pressure injection pipeline isolation valve;
the balance pipeline isolation valve is arranged on the balance pipeline;
the high-pressure injection pipeline isolation valve is arranged on the high-pressure safety injection water tank and an injection pipeline of a reactor coolant system;
the medium-pressure injection pipeline isolation valve is arranged on the medium-pressure safety injection water tank and an injection pipeline of a reactor coolant system;
the low pressure injection line isolation valve is disposed on the pump outlet and the reactor coolant system injection line.
Preferably, the balance pipeline isolation valve is a normally open electric valve during normal operation and is used for isolating a high-pressure safe injection water tank from a reactor coolant system during the starting and stopping processes;
the high-pressure injection pipeline isolation valve, the medium-pressure injection pipeline isolation valve and the low-pressure injection pipeline isolation valve are normally-closed electric gate valves during normal operation, so that the safe injection system is not put into operation during normal operation of the reactor, and the high-pressure injection pipeline isolation valve, the medium-pressure injection pipeline isolation valve and the low-pressure injection pipeline isolation valve are started after a safe injection signal is triggered.
Preferably, the top of the high-pressure safe injection water tank is connected with a reactor cold pipe section;
the bottom injection pipeline of the high-pressure safe injection water tank is connected with the bottom injection pipeline of the medium-pressure safe injection water tank in parallel and then connected with the pressure container;
the low-pressure safe injection system adopts a safe injection pump to take water from a pile pit reservoir and inject the water into a reactor cold pipe section.
Preferably, the heap pit water reservoir of the present invention can also be used for coolant recovery after a loss of coolant accident.
Preferably, the present invention further comprises a heat exchanger;
the heat exchanger is arranged in the pit reservoir, continuously guides the energy in the pit out of the containment, maintains the temperature of the safely injected fluid in the low-pressure recirculation stage, and ensures the continuous cooling of the reactor core.
Preferably, the present invention further comprises a potentiostat safety valve;
the safety valve of the voltage stabilizer is used for releasing pressure of a reactor coolant system, is matched with low-pressure safety injection for use, realizes long-term recirculation charging and discharging of a reactor core, and maintains continuous cooling of the reactor core.
Preferably, the invention also comprises a power device for providing power for the low-pressure safety injection pump.
In another aspect, the present invention further provides a method for using the safety injection system for a nuclear power plant, including the following steps:
A. when the pressure of the voltage stabilizer is monitored to be reduced to a first low-pressure setting value of the voltage stabilizer or the water level of the voltage stabilizer is monitored to be reduced to a first low-pressure setting value of the water level of the voltage stabilizer, the passive high-pressure safety injection is started, the isolation valve of the high-pressure safety injection pipeline is opened, and the passive high-pressure safety injection is realized based on the height difference and the density difference;
B. the water in the high-pressure safe injection water tank is continuously injected into the reactor core, the water level of the high-pressure safe injection water tank is reduced, and when the water level in the high-pressure safe injection water tank reaches the low setting value of the water level of the high-pressure safe injection water tank, a safety valve opening signal of a voltage stabilizer is triggered to release the pressure of a reactor coolant system;
C. when the pressure of the voltage stabilizer is monitored to be reduced to a second low-pressure setting value of the voltage stabilizer, starting medium-pressure safe injection, opening a medium-pressure safe injection pipeline isolating valve, and realizing passive medium-pressure safe injection based on compressed nitrogen and a height difference;
D. when the pressure of the voltage stabilizer is monitored to be reduced to a third low-pressure setting value of the voltage stabilizer, low-pressure safety injection is started, a low-pressure safety injection pipeline isolating valve is opened, a low-pressure safety injection pump is started, a heat exchanger of the reactor pit reservoir is started, long-term low-pressure safety injection recirculation is realized, reactor core submergence is guaranteed, continuous derivation of reactor core waste heat is maintained, and safety of a reactor is guaranteed.
The invention has the following advantages and beneficial effects:
1. the safety injection system combining the passive and active modes can realize comprehensive coverage of requirements of different pressure ranges such as high pressure, medium pressure and low pressure, diversity and reliability of safety injection functions, simplifies the structure of the system and improves the safety and the economy of a nuclear power plant.
2. The design of combining passive and active can give full play to the characteristics of high density difference and high driving head of the passive safe injection system under the high temperature and high pressure of the coolant system, and the requirement on a high-pressure safe injection pump is eliminated; the stable and controllable characteristics of the active safety injection system under the low-pressure working condition are fully exerted, and the problem that the driving force of the passive system is insufficient at low temperature and low pressure is avoided. The safety injection system combining the passive and the active can comprehensively cope with large, medium and small breakages of a reactor coolant system and cover various possible working conditions of high, medium and low pressure.
3. The passive high-pressure safe injection water tank and the medium-pressure safe injection water tank are designed integrally, so that the function division of the water tank is realized, and the injection pipeline is considered to be connected in parallel, so that the manufacturing cost of the pipeline and the water tank of the system is simplified.
4. The invention has international advanced technology level, can be applied to the design of a safety injection system of a pressurized water reactor nuclear power plant, and can improve the safety and the economy of the pressurized water reactor nuclear power plant.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic view of the structure of the safety injection system of the present invention.
Reference numbers and corresponding part names in the drawings:
1-pressure vessel, 2-reactor core, 3-manostat, 4-high-pressure safety injection water tank, 5-medium-pressure safety injection water tank, 6-balance pipeline isolation valve, 7-high-pressure injection pipeline isolation valve, 8-medium-pressure injection pipeline isolation valve, 9-low-pressure injection pipeline isolation valve, 10-low-pressure safety injection pump, 11-pit reservoir, 12-heat exchanger, 13-manostat safety valve and 14-containment vessel.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
The embodiment provides a safety injection system of a nuclear power plant, which combines passive and active.
The design principle of the safety injection system of the present embodiment is as follows:
after LOCA accident happens in a pressurized water reactor nuclear power plant, the reactor coolant is sprayed outwards from the crevasses. The reactor core water replenishing method comprises the steps that the water level of a voltage stabilizer is reduced and the pressure of the voltage stabilizer is reduced due to loss of the coolant filling amount of a reactor, the pressure reduction of the voltage stabilizer or the water level reduction of the voltage stabilizer judges that the reactor core needs water replenishing measures, and a passive high-pressure safety injection system is automatically triggered by a first low-pressure signal or a low-water-level signal of the voltage stabilizer to replenish water for the reactor core. When the LOCA accident cannot be stopped in time and the pressure of the reactor coolant system continuously drops, the second low-pressure signal of the voltage stabilizer automatically triggers the passive medium-pressure safety injection system to replenish water for the reactor core. The driving force of the passive high-pressure safety injection is derived from the height difference and the density difference between the high-pressure safety injection water tank and the reactor core, and the driving force of the passive medium-pressure safety injection is derived from the expansion work of the compressed gas of the medium-pressure safety injection tank in the injection stage to push the water of the medium-pressure safety injection tank to be injected into the reactor core. And the LOCA accident still can not be stopped in the medium-pressure safety injection stage, the pressure of the reactor coolant system continues to drop, and the third low-pressure signal of the voltage stabilizer automatically triggers the movable low-pressure safety injection system to replenish water for the reactor core. The low-pressure safe injection driving force is used for supplementing water to the reactor core in a safety injection pump mode, the low-pressure safe injection water source is located at the bottom of the reactor pit and has a heat exchanger and a water source collecting function after LOCA accidents, the low-pressure safe injection system can guarantee low-temperature recirculation injection, the water filling amount and waste heat derivation of the reactor are maintained, and the safety of the reactor is guaranteed.
As shown in fig. 1, the safety injection system of the present embodiment includes a high-pressure safety injection water tank 4, a medium-pressure safety injection water tank 5, and a low-pressure safety injection system provided in a safety housing 14.
The top of the passive high-pressure safe injection water tank 4 is connected with a reactor cold pipe section, and an injection pipeline at the bottom of the high-pressure safe injection water tank 4 is connected with an injection pipeline at the bottom of the medium-pressure safe injection water tank 5 in parallel and then connected with a pressure container.
The passive high-pressure safety injection water tank 4 of the present embodiment is filled with water, and is communicated with the reactor cooling system through a balance pipeline and an injection pipeline, and is disposed at a position higher than the core, and the water in the water tank is injected into the core depending on a height difference and a density difference.
The passive medium pressure safety injection tank 5 of this embodiment is filled with water and some compressed nitrogen and the tank is located above the core, and the injection line is directly connected to the pressure vessel, relying on the compressed nitrogen and the height difference to inject the water in the tank into the core.
The low-pressure safe injection system adopts a safe injection pump to take water from a water tank at the bottom of the reactor pit and inject the water into a cold pipe section of the reactor. Redundant isolation valves are arranged on the high-pressure, medium-pressure and low-pressure safety injection pipelines.
Specifically, the low pressure safety injection system of the present embodiment includes a low pressure safety injection pump 10 and a pit water reservoir 11.
The low-pressure safety injection pump 10 of the present embodiment is used for providing power drive for low-pressure safety injection, a pump suction inlet is arranged at the bottom of the stack pit reservoir 11, and a pump outlet is connected with a reactor coolant system through an injection pipeline.
The pit water reservoir 11 of the embodiment provides a water source for low-pressure safe injection, is arranged at the bottom of the pit and can be used for recovering the coolant after a loss of coolant accident.
The present embodiment provides a balance line isolation valve 6 on the balance line.
The balance pipeline isolation valve 6 of the embodiment is a normally open electric valve during normal operation, and is mainly used for isolating a high-pressure safety injection water tank from a reactor coolant system during the starting and stopping processes.
In the embodiment, a high-pressure injection line isolation valve 7 and a medium-pressure injection line isolation valve 8 are respectively arranged on the bottom injection line of the high-pressure safety injection water tank 4 and the bottom injection line of the medium-pressure safety injection water tank 5.
The present embodiment provides a low pressure injection line isolation valve 9 on the pump outlet and the injection line of the reactor coolant system.
The isolating valve on the injection pipeline of the embodiment is a normally-closed electric gate valve, the safe injection system is not put into use when the reactor normally operates, and after the safe injection signal is triggered, the isolating valve is started to start the safe injection system.
The pressure and the water level of the voltage stabilizer are measured through the reactor protection system, and the measured data are processed through control logic to form a safe injection system starting signal, namely when the pressure or the water level signal of the voltage stabilizer reaches the triggering condition of the safe injection system, equipment such as a pump and an isolation valve of the corresponding safe injection system is started to realize safe injection.
The safety injection system of this embodiment also includes a heat exchanger 12, a potentiostat safety valve 13, and a power plant (power supply).
The heat exchanger 12 of the present embodiment is installed in the cooling pit reservoir 11, continuously guides the energy in the pit out of the containment 14, maintains the temperature of the safely injected fluid in the low-pressure recirculation stage, and ensures continuous cooling of the core.
The pressure stabilizer safety valve 13 of the embodiment is used for pressure relief of a reactor coolant system, and can be used in cooperation with low-pressure safety injection to realize long-term recirculation charging and discharging of a reactor core and maintain continuous cooling of the reactor core.
The power equipment of the embodiment is used for providing a reliable power supply for the low-voltage safe injection pump and guaranteeing power supply.
The safety injection system combining the passive injection and the active injection is automatically operated, and the related system and equipment do not need an operator to perform any operation in the triggering and action processes, so that the influence of human factors is avoided. Taking a non-isolatable reactor coolant system break as an example, the specific operation flow is as follows:
A. after the reactor coolant system is broken, the pressure and the water level of the pressure stabilizer are reduced;
B. when the pressure of the voltage stabilizer is monitored to be reduced to a first low-pressure setting value of the voltage stabilizer or the water level of the voltage stabilizer is monitored to be reduced to a first low-pressure setting value of the water level of the voltage stabilizer, the passive high-pressure safety injection is started, the isolation valve of the high-pressure safety injection pipeline is opened, and the passive high-pressure safety injection is realized based on the height difference and the density difference;
C. the water in the high-pressure safe injection water tank is continuously injected into the reactor core, the water level of the high-pressure safe injection water tank is reduced, and when the water level in the high-pressure safe injection water tank reaches the low setting value of the water level of the high-pressure safe injection water tank, a safety valve opening signal of a voltage stabilizer is triggered to release the pressure of a reactor coolant system;
D. when the pressure of the voltage stabilizer is monitored to be reduced to a second low-pressure setting value of the voltage stabilizer, starting medium-pressure safe injection, opening a medium-pressure safe injection pipeline isolating valve, and realizing passive medium-pressure safe injection based on compressed nitrogen and a height difference;
E. when the pressure of the voltage stabilizer is monitored to be reduced to a third low-pressure setting value of the voltage stabilizer, low-pressure safety injection is started, a low-pressure safety injection pipeline isolating valve is opened, a low-pressure safety injection pump is started, a heat exchanger of the reactor pit reservoir is started, long-term low-pressure safety injection recirculation is realized, reactor core submergence is guaranteed, continuous derivation of reactor core waste heat is maintained, and safety of a reactor is guaranteed.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The safety injection system of the nuclear power plant combining the passive mode and the active mode is characterized by comprising a high-pressure safety injection water tank, a medium-pressure safety injection water tank and a low-pressure safety injection system which are arranged in a containment;
the high-pressure safety injection water tank is filled with water, is communicated with a reactor coolant system through a balance pipeline and an injection pipeline, is arranged higher than the reactor core, and injects the water in the water tank into the reactor core based on the height difference and the density difference;
the medium-pressure safe injection water tank is filled with certain compressed nitrogen, is arranged at a position higher than the reactor core, is connected with a reactor coolant system through an injection pipeline, and injects water in the water tank into the reactor core based on the compressed nitrogen and the height difference;
the low-pressure safe injection system adopts a low-pressure safe injection pump to take water from a pile pit reservoir and inject the water into a reactor coolant system.
2. The nuclear power plant safety injection system of claim 1, wherein the low pressure safety injection system includes a low pressure safety injection pump and a pit dump reservoir;
the low-pressure safe injection pump is used for providing power drive for low-pressure safe injection, a pump suction inlet is arranged at the bottom of the pile pit reservoir, and a pump outlet is connected with a reactor coolant system through an injection pipeline;
the stack pit reservoir provides a water source for low-pressure safe injection and is arranged at the bottom of the stack pit.
3. The nuclear power plant safety injection system of claim 2, further comprising a balance line isolation valve, a high pressure injection line isolation valve, a medium pressure injection line isolation valve, and a low pressure injection line isolation valve;
the balance pipeline isolation valve is arranged on the balance pipeline;
the high-pressure injection pipeline isolation valve is arranged on the high-pressure safety injection water tank and an injection pipeline of a reactor coolant system;
the medium-pressure injection pipeline isolation valve is arranged on the medium-pressure safety injection water tank and an injection pipeline of a reactor coolant system;
the low pressure injection line isolation valve is disposed on the pump outlet and the reactor coolant system injection line.
4. The nuclear power plant safety injection system of claim 3, wherein the balance pipeline isolation valve is a normally open electric valve during normal operation, and is used for isolating the high-pressure safety injection water tank from the reactor coolant system during the startup and shutdown process;
the high-pressure injection pipeline isolation valve, the medium-pressure injection pipeline isolation valve and the low-pressure injection pipeline isolation valve are normally-closed electric gate valves during normal operation, so that the safe injection system is not put into operation during normal operation of the reactor, and the high-pressure injection pipeline isolation valve, the medium-pressure injection pipeline isolation valve and the low-pressure injection pipeline isolation valve are started after a safe injection signal is triggered.
5. The nuclear power plant safety injection system of any one of claims 1 to 4, wherein the top of the high pressure safety injection water tank is connected to a reactor cold leg;
the bottom injection pipeline of the high-pressure safe injection water tank is connected with the bottom injection pipeline of the medium-pressure safe injection water tank in parallel and then connected with the pressure container;
the low-pressure safe injection system adopts a safe injection pump to take water from a pile pit reservoir and inject the water into a reactor cold pipe section.
6. The nuclear power plant safety injection system of any one of claims 1 to 4, wherein the heap pit reservoir is also capable of being used for coolant recovery after a loss of coolant accident.
7. The nuclear power plant safety injection system of any one of claims 1-4, further comprising a heat exchanger;
the heat exchanger is arranged in the pit reservoir, continuously guides the energy in the pit out of the containment, maintains the temperature of the safely injected fluid in the low-pressure recirculation stage, and ensures the continuous cooling of the reactor core.
8. The nuclear power plant safety injection system of any one of claims 1-4, further comprising a potentiostat safety valve;
the safety valve of the voltage stabilizer is used for releasing pressure of a reactor coolant system, is matched with low-pressure safety injection for use, realizes long-term recirculation charging and discharging of a reactor core, and maintains continuous cooling of the reactor core.
9. A nuclear power plant safety injection system according to any of claims 1 to 4, further comprising a power plant for powering the low pressure safety injection pump.
10. Use of a nuclear plant safety injection system according to any of claims 1 to 9, characterized in that it comprises the following steps:
A. when the pressure of the voltage stabilizer is monitored to be reduced to a first low-pressure setting value of the voltage stabilizer or the water level of the voltage stabilizer is monitored to be reduced to a first low-pressure setting value of the water level of the voltage stabilizer, the passive high-pressure safety injection is started, the isolation valve of the high-pressure safety injection pipeline is opened, and the passive high-pressure safety injection is realized based on the height difference and the density difference;
B. the water in the high-pressure safe injection water tank is continuously injected into the reactor core, the water level of the high-pressure safe injection water tank is reduced, and when the water level in the high-pressure safe injection water tank reaches the low setting value of the water level of the high-pressure safe injection water tank, a safety valve opening signal of a voltage stabilizer is triggered to release the pressure of a reactor coolant system;
C. when the pressure of the voltage stabilizer is monitored to be reduced to a second low-pressure setting value of the voltage stabilizer, starting medium-pressure safe injection, opening a medium-pressure safe injection pipeline isolating valve, and realizing passive medium-pressure safe injection based on compressed nitrogen and a height difference;
D. when the pressure of the voltage stabilizer is monitored to be reduced to a third low-pressure setting value of the voltage stabilizer, low-pressure safety injection is started, a low-pressure safety injection pipeline isolating valve is opened, a low-pressure safety injection pump is started, a heat exchanger of the reactor pit reservoir is started, long-term low-pressure safety injection recirculation is realized, reactor core submergence is guaranteed, continuous derivation of reactor core waste heat is maintained, and safety of a reactor is guaranteed.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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