CN214410809U - Low-temperature water-tight real overpressure protection system for nuclear power plant - Google Patents

Low-temperature water-tight real overpressure protection system for nuclear power plant Download PDF

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Publication number
CN214410809U
CN214410809U CN202023150445.8U CN202023150445U CN214410809U CN 214410809 U CN214410809 U CN 214410809U CN 202023150445 U CN202023150445 U CN 202023150445U CN 214410809 U CN214410809 U CN 214410809U
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overpressure protection
protection
power plant
nuclear power
overpressure
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CN202023150445.8U
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赵嘉明
赵斌
王广飞
房丽萍
刘江
毛喜道
杜思佳
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China Nuclear Power Engineering Co Ltd
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China Nuclear Power Engineering Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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Abstract

The utility model discloses a low-temperature watertight real overpressure protection system for a nuclear power plant, which comprises a first protection unit, a second protection unit and a third protection unit, wherein the first protection unit is arranged on a reactor waste heat discharge system in the nuclear power plant; the second protection unit is arranged on a reactor coolant system in the nuclear power plant; the third protection unit is arranged on an outlet pipeline of a medium-pressure safety injection pump in a safety injection system in the nuclear power plant and comprises a third overpressure protection pipeline and a second isolation valve, the third overpressure protection pipeline is connected with the outlet pipeline of the medium-pressure safety injection pump, and the second isolation valve is arranged on the third overpressure protection pipeline. The utility model discloses a protection system can improve the reliability and the security of nuclear power plant of the closely knit superpressure protection of nuclear power plant's low-temperature water.

Description

Low-temperature water-tight real overpressure protection system for nuclear power plant
Technical Field
The utility model belongs to the technical field of the nuclear power, concretely relates to real superpressure protection system of low temperature watertight of nuclear power plant.
Background
The low-temperature water-tight overpressure protection system is an important safety-related system in a nuclear power plant. The low-temperature water-tight and practical overpressure protection system of the existing nuclear power plant is mainly characterized in that an overpressure protection valve bank and an isolation valve for receiving automatic signals are arranged on a suction pipeline of a waste heat discharge system. The nuclear power plant adopting the structure usually has the following condition that after an automatic isolation signal is received, the isolation valve is closed, the overpressure protection valve bank is isolated, and at the moment, the low-temperature water-tight overpressure protection system cannot be used for low-temperature overpressure protection of a reactor coolant system. In addition, some low-temperature water-tight overpressure protection systems of nuclear power plants are provided with a voltage stabilizer safety valve on a hot section of a reactor coolant system to realize a low-temperature overpressure protection function, and under the condition that only two rows of control power supplies exist, when one row of power is lost and/or a valve fails to move, the redundancy and the allowance of the low-temperature water-tight overpressure protection system for realizing the overpressure protection function are small.
Therefore, the existing nuclear power plant has the problems that the water-tight, low-temperature and overpressure protection measures of the whole nuclear power plant are single relatively.
SUMMERY OF THE UTILITY MODEL
Not enough more than that exists to prior art, the utility model discloses a real superpressure protection system of low temperature watertight can improve the reliability of the real superpressure protection of nuclear power plant low temperature watertight and the security of nuclear power plant.
Solve the utility model discloses in above-mentioned technical problem's technical scheme as follows:
a low-temperature water tight and overpressure protection system for a nuclear power plant comprises a first protection unit, a second protection unit and a third protection unit,
the first protection unit is arranged on a reactor waste heat discharge system in the nuclear power plant;
the second protection unit is arranged on a reactor coolant system in the nuclear power plant;
the third protection unit is arranged on an outlet pipeline of a medium-pressure safety injection pump in a safety injection system in the nuclear power plant and comprises a third overpressure protection pipeline and a second isolation valve, the third overpressure protection pipeline is connected with the outlet pipeline of the medium-pressure safety injection pump, and the second isolation valve is arranged on the third overpressure protection pipeline.
Preferably, the first protection unit comprises a first overpressure protection line, a first overpressure protection valve pack,
the first overpressure protection pipeline is connected with a suction pipeline of the reactor waste heat discharge system, and the first overpressure protection valve bank is arranged on the first overpressure protection pipeline.
Preferably, a connection point of the first overpressure protection pipeline and a suction pipeline of the reactor residual heat removal system is located in a containment vessel of the nuclear power plant, and a first isolation valve is arranged on the suction pipeline of the reactor residual heat removal system at an upstream position of the connection point.
Preferably, the first overpressure protection valve bank comprises at least two first overpressure protection valves, and each first overpressure protection valve is arranged in parallel.
Preferably, the second protection unit comprises a second overpressure protection line, a second overpressure protection valve pack,
the second overpressure protection line is connected with a heat pipe section of the reactor coolant system, and the second overpressure protection valve bank is arranged on the second overpressure protection line.
Preferably, an inlet side of a suction line of the reactor waste heat discharge system is connected with a heat pipe section of the reactor coolant system, and an outlet side of the suction line of the reactor waste heat discharge system penetrates out of the containment vessel.
Preferably, the second protection unit further comprises a pressure stabilizer, and the pressure stabilizer is arranged on the second overpressure protection pipeline and is located between the second overpressure protection valve bank and the heat pipe section of the reactor coolant system.
Preferably, the second overpressure protection valve bank comprises at least two second overpressure protection valves, and each second overpressure protection valve is arranged in parallel.
Preferably, the second overpressure protection valve bank comprises two second overpressure protection valves, and the control electricity of the two second overpressure protection valves is supplied by independent emergency diesel series respectively.
Preferably, the second overpressure protection valve group comprises three or four second overpressure protection valves, and the control electricity of each second overpressure protection valve is supplied by an independent protection group series and/or an independent emergency diesel series.
The utility model discloses a real superpressure protection system of nuclear power plant low temperature watertight, through setting up first protection unit, second protection unit and third protection unit, during nuclear power plant normal operating, the superpressure protection function to reactor coolant system is realized through pressure release and step-down mode to the first superpressure protection valves on the usable waste heat discharge system suction line, the stabiliser on the reactor coolant system hot section, the third superpressure protection pipeline of medium pressure ann notes pump export; when the nuclear power plant has abnormal working conditions, if the safe injection system is started by mistake or a signal is started by mistake in a watertight real state, the first protection unit is not available, the second protection unit and the third protection unit can still be normally used, and even if the second protection unit or the third protection unit fails in a superposition mode, one of the protection units can still be normally used. Compared with the traditional technology, the system can effectively improve the reliability of low-temperature water sealing and overpressure and the safety of a nuclear power plant.
Drawings
Fig. 1 is a schematic structural diagram of a third protection unit of a low-temperature water-tight real overpressure protection system of a nuclear power plant in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first protection unit of a low-temperature water-tight overpressure protection system of a nuclear power plant in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second protection unit of the low-temperature water-tight overpressure protection system in the embodiment of the present invention.
Wherein: 10-a suction pipeline of a reactor waste heat discharge system; 11-a first overpressure protection line; 12-a first overpressure protection valve group; 121-a first overpressure protection valve; 13-a first isolation valve; 40-a containment vessel; 20-a heat pipe section of a reactor coolant system; 21-a second overpressure protection line; 22-a second overpressure protection valve group; 221-a second overpressure protection valve; 23-a voltage stabilizer; 30-outlet pipeline of medium pressure safety injection pump; 31-a third overpressure protection line; 32-a second isolation valve; 33-small flow line; 34-a third isolation valve; 35-medium pressure safety injection pump.
Detailed Description
In order to make the technical field of the present invention better understand, the drawings and the specific embodiments of the present invention will be combined, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments, for further clear and complete description of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, 2 and 3, the present embodiment discloses a low-temperature water tight overpressure protection system for a nuclear power plant to ensure that the pressure of a reactor coolant system in the nuclear power plant is within a specified safety value, which includes a first protection unit, a second protection unit and a third protection unit, wherein:
the first protection unit is arranged on a reactor waste heat discharge system in the nuclear power plant and used for releasing pressure to the reactor waste heat system, and a reactor coolant system in the nuclear power plant is directly or indirectly communicated with other systems such as the reactor waste heat discharge system and the like, so that the reactor coolant system can be released and depressurized indirectly by releasing pressure to the reactor waste heat discharge system, and overpressure protection to the reactor coolant system is realized;
the second protection unit is arranged on a reactor coolant system in the nuclear power plant and used for relieving pressure and reducing pressure of the reactor coolant system to realize overpressure protection of the reactor coolant system.
The third protection unit is arranged on an outlet pipeline 30 of a medium-pressure safety injection pump 35 in a safety injection system in a nuclear power plant, and as shown in fig. 1, the third protection unit comprises a third overpressure protection pipeline 31 and a second isolation valve 32, the third overpressure protection pipeline 31 is connected with the outlet pipeline 30 of the medium-pressure safety injection pump 35, the second isolation valve 32 is arranged on the third overpressure protection pipeline 31, and the second isolation valve 32 is in a normally closed state. And the safety injection system in the nuclear power plant is directly or indirectly communicated with other systems such as a reactor waste heat discharge system, when the second isolation valve 32 is opened, the flow injected into the reactor coolant system can be reduced through the third overpressure protection pipeline 31, so that the pressure relief and pressure reduction can be indirectly carried out on the reactor coolant system, the low-temperature water tight overpressure protection on the reactor coolant system is realized, and the safety of the nuclear power plant is further ensured.
In some embodiments, as shown in fig. 2, the first protection unit includes a first overpressure protection line 11, a first overpressure protection valve set 12, the first overpressure protection line 11 is connected with the suction line 10 of the reactor residual heat removal system, and the first overpressure protection valve set 12 is disposed on the first overpressure protection line 11. When the first overpressure protection valve bank 12 is opened, the reactor waste heat discharge system can be decompressed through the first overpressure protection pipeline 11, so that the reactor coolant system is indirectly decompressed and depressurized, and low-temperature water tight overpressure protection of the reactor coolant system is realized.
In some embodiments, the connection point of the first overpressure protection line 11 and the suction line 10 of the residual heat removal system is located in the containment 40 of the nuclear power plant, and the first isolation valve 13 is arranged on the suction line 10 of the residual heat removal system at the position upstream of the connection point, so as to prevent radioactive materials from being discharged out of the containment 40 when overpressure protection is performed, and ensure safety.
In some embodiments, the first overpressure protection valve group 12 includes at least two first overpressure protection valves 121, and each first overpressure protection valve 121 is arranged in parallel, the number of the first overpressure protection valves 121 in the first overpressure protection valve group 12 may be specifically selected according to the displacement of a single first overpressure protection valve 121, and when an abnormality occurs in one first overpressure protection valve 121, the remaining first overpressure protection valves 12 may still be used normally, so as to improve the reliability of the first overpressure protection valve group 12. In this embodiment, the magnitude of the take-off fixed value of each first overpressure protection valve bank 121 in the first overpressure protection valve bank 12 is the same, which may be determined according to the actual design condition of the process system, and when the pressure in the first overpressure protection pipeline 11 reaches the take-off fixed value, at least one first overpressure protection valve 121 in the first overpressure protection valve bank 12 may be opened, so that the first overpressure protection pipeline 11 is connected and depressurized.
In some embodiments, as shown in fig. 3, the second protection unit comprises a second overpressure protection line 21, a second overpressure protection valve pack 22, the second overpressure protection line 21 being connected to the heat pipe section 20 of the reactor coolant system, the second overpressure protection valve pack 22 being provided on the second overpressure protection line 21. When the second overpressure protection valve bank 22 is opened, the reactor coolant system can be directly decompressed through the second overpressure protection pipeline 21, so that the pressure of the reactor coolant system is reduced, and low-temperature water tight overpressure protection of the reactor coolant system is realized.
In some embodiments, the inlet side of the suction line 10 of the reactor residual heat removal system is connected to the heat pipe section 20 of the reactor coolant system, and the outlet side of the suction line of the reactor residual heat removal system passes through the containment vessel 40, so as to avoid radioactive substances from being discharged out of the containment vessel 40 when overpressure protection is performed, and ensure safety.
In some embodiments, the second protection unit further comprises a pressure stabilizer 23, the pressure stabilizer 23 being provided on the second overpressure protection line 21 and between the second overpressure protection valve pack 22 and the heat pipe section 20 of the reactor coolant system.
In some embodiments, the second overpressure protection valve group 22 includes at least two second overpressure protection valves 221, and each second overpressure protection valve 221 is disposed in parallel, specifically, the number of the second overpressure protection valves 221 in the second overpressure protection valve group 22 may be selected according to the displacement of a single second overpressure protection valve 221, and when one second overpressure protection valve 221 is abnormal, the remaining second overpressure protection valves 221 may still be used normally, so as to improve the reliability of the second overpressure protection valve group 22. In this embodiment, the tripping threshold of each second overpressure protection valve 221 in the second overpressure protection valve group 22 is the same, and is different from the tripping threshold of the first overpressure protection valve 121, which may be determined according to the actual design condition of the process system, and when the pressure in the second overpressure protection pipeline 21 reaches the tripping threshold, at least one second overpressure protection valve 221 in the second overpressure protection valve group 22 may be opened, so that the second overpressure protection pipeline 21 is connected and depressurized.
In some specific embodiments, the second overpressure protection valve group 22 may include two second overpressure protection valves 221 with corresponding displacement, and the control signals of the two second overpressure protection valves 221 are respectively supplied with power by independent emergency diesel series, or, of course, may also be supplied with power by other similar reliable power sources, so that it may be ensured that the other power supply is kept normally supplied under the condition of single fault such as loss of one power supply, and thus, the reliability of the second protection unit may be improved, and the overpressure protection function is ensured to be effectively implemented.
In some specific embodiments, the second overpressure protection valve group 22 may further include three or four second overpressure protection valves 221 with corresponding displacement, and the control signal of each second overpressure protection valve 221 is powered by an independent protection group series and/or an independent emergency diesel series, and of course, other similar reliable power supplies may also be used, so that under the condition of single fault such as loss of one-line power supply, even under the condition that one second overpressure protection valve 221 is superimposed to reject movement (i.e., fails), at least one line of power supply can still be guaranteed to maintain normal power supply, and further, the reliability of the second protection unit can be improved, and the overpressure protection function can be effectively realized.
In some embodiments, the first overpressure protection valve 121 and the second overpressure protection valve 221 may both be spring-type safety valves, may both be pilot-type safety valves, and may have other valves performing opening and closing functions.
Since the small flow line 33 needs to be provided on the outlet line 30 of the medium pressure safety injection pump 35 in the safety injection system, and the third isolation valve 34 is provided on the small flow line 33, in some embodiments, the third protection line 31 in the third protection unit may also be merged with the small flow line 33, i.e. share the same line, and the second isolation valve 32 is the third isolation valve 34 on the small flow line 33, at this time, the second isolation valve 32 may be in an open state or a closed state according to the actual conditions of the nuclear power plant.
The low-temperature water-tight real overpressure protection system for the nuclear power plant of the embodiment can improve the reliability of low-temperature water-tight real overpressure protection of the nuclear power plant and the safety of the nuclear power plant compared with the traditional technology, and specifically comprises the following steps:
by arranging the first protection unit, the second protection unit and the third protection unit, during the normal operation of the nuclear power plant, the overpressure protection function of the reactor coolant system is realized by utilizing a first overpressure protection valve bank on a waste heat discharge system suction pipeline, a voltage stabilizer on a reactor coolant system hot section and a third overpressure protection pipeline at the outlet of a medium-pressure safety injection pump 35 in a pressure relief and pressure reduction mode, so that the safety of the nuclear power plant is ensured;
moreover, when the nuclear power plant has abnormal working conditions, such as the safe injection system is started by mistake or a starting signal is started by mistake in a watertight real state, so that the first protection unit is unavailable, the second protection unit and the third protection unit can still be normally used, even if the second protection unit or the third protection unit fails in a superposition mode, one of the protection units can still be normally used, namely, under the assumption of the worst accident analysis of the nuclear power plant, the low-temperature overpressure protection function of the reactor coolant system can still be realized, and the reliability of low-temperature watertight overpressure and the safety of the nuclear power plant are improved;
in addition, the second overpressure protection valve group in the second protection unit is provided with at least two second overpressure protection valves with corresponding discharge capacities, and the control signals of the second overpressure protection valves are respectively supplied with power by an independent protection group series and/or an independent emergency diesel engine series, so that the overpressure protection function of the reactor coolant system can be still realized under the condition that a single power supply is lost and the like, even one second overpressure protection valve is superposed to reject movement, and the reliability of low-temperature watertight overpressure implementation and the safety of a nuclear power plant are improved.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (10)

1. A low-temperature water tight and overpressure protection system for a nuclear power plant is characterized by comprising a first protection unit, a second protection unit and a third protection unit,
the first protection unit is arranged on a reactor waste heat discharge system in the nuclear power plant;
the second protection unit is arranged on a reactor coolant system in the nuclear power plant;
the third protection unit is arranged on an outlet pipeline (30) of a medium-pressure safety injection pump (35) in a safety injection system in the nuclear power plant, and comprises a third overpressure protection pipeline (31) and a second isolation valve (32), the third overpressure protection pipeline is connected with the outlet pipeline of the medium-pressure safety injection pump, and the second isolation valve is arranged on the third overpressure protection pipeline.
2. The nuclear power plant low temperature water seal overpressure protection system of claim 1, wherein the first protection unit comprises a first overpressure protection line (11), a first overpressure protection valve pack (12),
the first overpressure protection pipeline is connected with a suction pipeline (10) of the reactor waste heat discharge system, and the first overpressure protection valve bank is arranged on the first overpressure protection pipeline.
3. The nuclear power plant low-temperature water compaction overpressure protection system according to claim 2, wherein a connection point of the first overpressure protection line and a suction line of the reactor residual heat removal system is located in a containment (40) of the nuclear power plant, and a first isolation valve (13) is arranged on the suction line of the reactor residual heat removal system at a position upstream of the connection point.
4. A nuclear power plant low temperature water seal overpressure protection system according to claim 2, characterized in that the first overpressure protection valve bank comprises at least two first overpressure protection valves (121), and each of the first overpressure protection valves is arranged in parallel.
5. The nuclear power plant low temperature water seal overpressure protection system of claim 2, wherein the second protection unit comprises a second overpressure protection line (21), a second overpressure protection valve pack (22),
the second overpressure protection line is connected to a heat pipe section (20) of the reactor coolant system, and the second overpressure protection valve block is arranged on the second overpressure protection line.
6. The nuclear power plant low-temperature water compaction overpressure protection system of claim 5, wherein an inlet side of an intake line of the reactor residual heat removal system is connected to a heat pipe section of the reactor coolant system, and an outlet side of the intake line of the reactor residual heat removal system passes out of a containment vessel.
7. The nuclear power plant low temperature water seal overpressure protection system of claim 5, wherein the second protection unit further includes a pressure regulator (23) disposed on the second overpressure protection line between the second overpressure protection valve set and the heat pipe section of the reactor coolant system.
8. The nuclear power plant low-temperature water seal overpressure protection system of claim 7, wherein the second overpressure protection valve bank comprises at least two second overpressure protection valves (221), and each of the second overpressure protection valves is arranged in parallel.
9. The nuclear power plant low-temperature water-tight overpressure protection system of claim 8, wherein the second overpressure protection valve bank comprises two second overpressure protection valves, and the control power of the two second overpressure protection valves is supplied by independent emergency diesel series.
10. The nuclear power plant low-temperature water seal overpressure protection system of claim 8, wherein the second overpressure protection valve set comprises three or four second overpressure protection valves, and the control electricity of each second overpressure protection valve is supplied by an independent protection group series power supply and/or an independent emergency diesel series power supply.
CN202023150445.8U 2020-12-24 2020-12-24 Low-temperature water-tight real overpressure protection system for nuclear power plant Active CN214410809U (en)

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Application Number Priority Date Filing Date Title
CN202023150445.8U CN214410809U (en) 2020-12-24 2020-12-24 Low-temperature water-tight real overpressure protection system for nuclear power plant

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Application Number Priority Date Filing Date Title
CN202023150445.8U CN214410809U (en) 2020-12-24 2020-12-24 Low-temperature water-tight real overpressure protection system for nuclear power plant

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