CN104332206A - Overpressure protection method for reactor startup/shutdown condition of PWR (pressurized water reactor) nuclear power plant - Google Patents
Overpressure protection method for reactor startup/shutdown condition of PWR (pressurized water reactor) nuclear power plant Download PDFInfo
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- CN104332206A CN104332206A CN201310307052.9A CN201310307052A CN104332206A CN 104332206 A CN104332206 A CN 104332206A CN 201310307052 A CN201310307052 A CN 201310307052A CN 104332206 A CN104332206 A CN 104332206A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
- G21D3/06—Safety arrangements responsive to faults within the plant
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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
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Abstract
The invention relates to an overpressure protection method for reactor startup/shutdown condition of a PWR (pressurized water reactor) nuclear power plant. The method comprises the following steps: the step 1) carrying out power plant reactor shutdown condition overpressure protection; and the step 2) carrying out power plant reactor startup condition overpressure protection: 2.1 carrying out temperature rise period overpressure protection which comprises the following steps: 2.1.1 carrying out temperature rise alarming operation; 2.1.2 carrying out pressure stabilizer safety valve function switching operation; and 2.1.3 carrying out normal temperature rise operation; and 2.2 carrying out hydrostatic test overpressure protection comprising the following steps: 2.2.1 setting coolant protection temperature of the hydrostatic test to be T1=70-120 DEG; 2.2.2 carrying out temperature rising operation according to the temperature rise period overpressure protection operation in the step 2.1, and when the temperature reaches a set temperature T1, switching the low temperature protection mode after the reactor shutdown to the normal operation protection mode; and 2.2.3 carrying out hydrostatic test on a reactor coolant system. The method helps to improve the capability of the RCS for coping with overpressure transient event, and reduce pressure boundary integrity damage risk of the coolant system greatly; and the method facilities the RCS overpressure protection under the operating conditions of reactor startup/shutdown, and hydrostatic test and the like.
Description
Technical field
The present invention relates to pressurized-water reactor nuclear power plant transient state mitigation strategy and accident prevention technical field, be specifically related to a kind of pressurized-water reactor nuclear power plant and open/overpressure protection the method for shutdown condition.
Background technology
Nuclear power plant opening/shutdown condition during, the misoperation due to relevant device may cause mass input or energy input occur in reactor coolant loop (RCS), and this transient condition can cause RCS pressure increase.Especially, when coolant temperature is less than reactor pressure vessel material nil ductility transition reference temperature (RTNDT), RCS pressure is once the pressure limit under exceeding low-temperature condition may cause pressure vessel locally brittle fracture to occur.Under low-temperature condition, the limit value of the pressure limit specific power operating condition of RCS is much lower, therefore, must for opening/RCS of shutdown condition low-temperature condition carries out overpressure protection design.
In existing operation nuclear power station, when residual heat removal system access reactor coolant loop, provide certain overpressure protection by residual heat removal system safety valve to reactor coolant loop.Consider that residual heat removal system may by the situation of isolating or Residual heat removal safety valve breaks down by mistake; in order to tackle the superpressure transient affair occurred under remaining disposing presses the unavailable situation of approach; strengthen nuclear power plant RCS opening/the overpressure protection measure of shutdown condition, need to propose pressurizer safety valve and combine with residual heat removal system (arranging more than being called for short) safety valve to provide and open/shutdown condition overpressure protection and power plant management method accordingly.
Summary of the invention
The technical matters that will solve of the present invention is to provide a kind of pressure transient can alleviating expection, and the nuclear power station avoiding the integrality of reactor coolant loop pressure boundary to suffer damage opens/the reactor coolant loop overpressure protection method of shutdown condition.
In order to solve the problems of the technologies described above, technical scheme of the present invention is, a kind of pressurized-water reactor nuclear power plant opens/and the overpressure protection method of shutdown condition, comprise the following steps:
Step 1, power plant's shutdown condition overpressure protection
1.1 normally lower the temperature operation
Operator controls power plant's main cooling system cooling, and make it from hot shutdown working conditions change to cold shut operating mode, during this period, pressurizer safety valve is operated in normal running protection pattern, and residual heat removal system is first accessed main coolant system by operator;
More than 1.2 arrange safety valve provides protection to operate
Operator controls residual heat removal system makes main coolant system continue cooling, and relies on remaining row's safety valve to implement overpressure protection;
1.3 pressurizer safety valve function blocked operations
When coolant temperature in main coolant system drops to design temperature T
01during=100-140 DEG C, trigger the first yellow alarm signal that cooling switches, when operator responds the first warning yellow signal, eliminate the first yellow alarm, the first red alarm signal conductively-closed switched of simultaneously lowering the temperature; Described first warning red is that operator does not respond the first warning yellow signal, and reactor coolant loop temperature continues to drop to lower design temperature T
0-=90-130 DEG C, the alerting signal of triggering;
When after triggering first warning red signal, main coolant system will stop cooling to cooling medium, after waiting for that operator completes cooling blocked operation, eliminate the first warning yellow signal and the first red alarm signal;
1.4 Low temperature overpressure protection operations
After pressurizer safety valve mode of operation is switched to low-temperature protection pattern, main coolant system temperature continues to decline, when the transient condition occurred makes main coolant system pressure increase more than 3-5MPa, then trigger Low temperature overpressure alerting signal, and when main coolant system pressure reaches after setting valve 3-5MPa opened by safety valve, release is implemented to described main coolant system;
Heap operating mode overpressure protection opens in step 2, power plant
The overpressure protection operation of 2.1 temperature rise periods
Operator controls power plant and opens heap, makes it from cold shut working conditions change to hot shutdown operating mode, comprises the following steps:
2.1.1 heat up alarm operation
Before power plant's main coolant system intensification starts, pressurizer safety valve mode of operation is in low-temperature protection pattern, when coolant temperature in main coolant system rises to design temperature T
02during=100-140 DEG C, first trigger the second yellow alarm signal heating up and switch;
2.1.2 pressurizer safety valve function blocked operation
If operator responds the second warning yellow, complete intensification blocked operation, and eliminate the second yellow alarm, the second red alarm conductively-closed that Low temperature overpressure is reported to the police and intensification switches simultaneously;
If after triggering the second red alarm heating up and switch, stopping heats up by main coolant system; Wait for that operator completes intensification blocked operation, and after pressurizer safety valve mode of operation is switched to normal protected mode, continue coolant heating in main coolant system, Low temperature overpressure warning function conductively-closed simultaneously;
Described second warning red is that operator does not respond the second warning yellow signal, and in reactor coolant loop, coolant temperature rises to design temperature T
0+=110-150 DEG C, the alerting signal of triggering;
2.1.3 normal warming temperature
After low-temperature protection pattern switches to normal running protection pattern, residual heat removal system is still connected with main coolant system, in this case, relies on remaining row's safety valve to provide overpressure protection, and controls main coolant system continuation intensification;
2.2 hydraulic testing overpressure protections
After power plant's cold-refueling operation terminates, before heap opens in power plant, comprise the following steps:
2.2.1 the cooling medium protection temperature setting the hydraulic testing is T
1=70-120 DEG C;
2.2.2 warming temperature is carried out, when temperature reaches design temperature T according to the temperature rise period overpressure protection operation in above-mentioned steps 2.1
1after, be switched to normal running protection pattern from the low-temperature protection pattern after shutdown;
2.2.3 the hydraulic testing is carried out to reactor coolant loop;
Described normal running protection pattern is that the pattern of setting valve at 16-18MPa opened by the safety valve of voltage stabilizer.
It is that the function of pressurizer safety valve is switched to low-temperature protection pattern by normal running protection pattern by operator that described cooling switches.
Described low-temperature protection pattern is that the safety valve of voltage stabilizer opens setting valve at 3-5MPa.
It is that the function of pressurizer safety valve is switched to normal running protection pattern by low-temperature protection pattern by operator that described intensification switches.
Beneficial effect of the present invention:
Method of the present invention improves the ability that RCS tackles superpressure transient affair, can tolerate the pressure transient event of worst cold case smallest limit, greatly reduces the impaired risk of coolant system pressure boundary integrality; Method of the present invention facilitates the RCS overpressure protection under the service conditions such as start and stop heap, the hydraulic testing.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
A kind of pressurized-water reactor nuclear power plant of the present invention opens/the overpressure protection method of shutdown condition, specifically comprise the following steps:
Step 1, power plant's shutdown condition overpressure protection
1.1 normally lower the temperature operation
Operator controls power plant's main cooling system cooling, make it from hot shutdown working conditions change to cold shut operating mode, during this period, pressurizer safety valve is operated in normal running protection pattern, now there is certain air space in voltage stabilizer, residual heat removal system is first accessed main coolant system by operator; Described normal running protection pattern is that the pattern of setting valve at 16-18MPa opened by the safety valve of voltage stabilizer;
More than 1.2 arrange safety valve provides protection to operate
Main coolant system continues cooling by residual heat removal system, and the air space of voltage stabilizer is full of by water gradually, and main coolant system enters the real operating mode of watertight, during this period, relies on remaining row's safety valve to implement overpressure protection;
1.3 pressurizer safety valve function blocked operations
When coolant temperature in main coolant system drops to design temperature T
01during=100-140 DEG C, trigger the first yellow alarm signal that cooling switches, when operator responds the first warning yellow signal, eliminate the first yellow alarm, the first red alarm signal conductively-closed switched of simultaneously lowering the temperature;
It is that the function of pressurizer safety valve is switched to low-temperature protection pattern by normal running protection pattern by operator that described cooling switches, and described low-temperature protection pattern is that the safety valve of voltage stabilizer opens setting valve at 3-5MPa; Described first warning red is that operator does not respond the first warning yellow signal, and reactor coolant loop temperature continues to drop to lower design temperature T
0-=90-130 DEG C, the alerting signal of triggering;
When after triggering first warning red signal, main coolant system will stop cooling to cooling medium, after waiting for that operator completes cooling blocked operation, eliminate the first warning yellow signal and the first red alarm signal;
1.4 Low temperature overpressure protection operations
After pressurizer safety valve mode of operation is switched to low-temperature protection pattern, main coolant system temperature continues to decline, when main coolant system pressure increase is more than 3-5MPa, trigger Low temperature overpressure alerting signal, and when main coolant system pressure reaches after setting valve 3-5MPa opened by safety valve, release is implemented to described main coolant system;
Heap operating mode overpressure protection opens in step 2, power plant
The overpressure protection operation of 2.1 temperature rise periods
Operator controls power plant and opens heap, makes it from cold shut working conditions change to hot shutdown operating mode, comprises the following steps:
2.1.1 heat up alarm operation
Before power plant's main coolant system intensification starts, pressurizer safety valve mode of operation is in low-temperature protection pattern, when coolant temperature in main coolant system rises to design temperature T
02during=100-140 DEG C, first trigger the second yellow alarm signal heating up and switch;
It is that the function of pressurizer safety valve is switched to normal running protection pattern by low-temperature protection pattern by operator that described intensification switches;
2.1.2 pressurizer safety valve function blocked operation
If operator responds the second warning yellow, complete intensification blocked operation, and eliminate the second yellow alarm, Low temperature overpressure is reported to the police and the conductively-closed of intensification switching second red alarm simultaneously;
If after triggering intensification switching second red alarm, stopping heats up by main coolant system; Wait for that operator completes intensification blocked operation, after pressurizer safety valve mode of operation is switched to normal protected mode, continue coolant heating in main coolant system, Low temperature overpressure warning function conductively-closed simultaneously;
Described second warning red is that operator does not respond the second warning yellow signal, and in reactor coolant loop, coolant temperature rises to design temperature T
0+=110-150 DEG C, the alerting signal of triggering;
2.1.3 normal warming temperature
After low-temperature protection pattern switches to normal running protection pattern, residual heat removal system is still connected with main coolant system, in this case, relies on remaining row's safety valve to provide overpressure protection, and controls main coolant system continuation intensification;
2.2 hydraulic testing overpressure protections
After power plant's cold-refueling operation terminates, before heap opens in power plant, need that the online hydraulic testing is carried out to reactor coolant loop and check its sealing.Before coolant system cold section of temperature reaches the requirement temperature of the hydraulic testing, the function of Low temperature overpressure protection system must be kept effective, after reaching the temperature of hydraulic testing requirement, Low temperature overpressure protected mode must be shielded and just can carry out the hydraulic testing.Comprise the following steps:
2.2.1 the cooling medium protection temperature setting the hydraulic testing is T
1=70-120 DEG C;
2.2.2 warming temperature is carried out, when temperature reaches design temperature T according to the temperature rise period overpressure protection operation in above-mentioned steps 2.1
1after, be switched to normal running protection pattern from the low-temperature protection pattern after shutdown;
2.2.3 the hydraulic testing is carried out to reactor coolant loop.
Claims (5)
1. pressurized-water reactor nuclear power plant opens the/overpressure protection method of shutdown condition, it is characterized in that: comprise the following steps:
Step 1, power plant's shutdown condition overpressure protection
1.1 normally lower the temperature operation
Operator controls power plant's main cooling system cooling, and make it from hot shutdown working conditions change to cold shut operating mode, during this period, pressurizer safety valve is operated in normal running protection pattern, and residual heat removal system is first accessed main coolant system by operator;
More than 1.2 arrange safety valve provides protection to operate
Operator controls residual heat removal system makes main coolant system continue cooling, and relies on remaining row's safety valve to implement overpressure protection;
1.3 pressurizer safety valve function blocked operations
When coolant temperature in main coolant system drops to design temperature T
01during=100-140 DEG C, trigger the first yellow alarm signal that cooling switches, when operator responds the first warning yellow signal, eliminate the first yellow alarm, the first red alarm signal conductively-closed switched of simultaneously lowering the temperature; Described first warning red is that operator does not respond the first warning yellow signal, and reactor coolant loop temperature continues to drop to lower design temperature T
0-=90-130 DEG C, the alerting signal of triggering;
When after triggering first warning red signal, main coolant system will stop cooling to cooling medium, after waiting for that operator completes cooling blocked operation, eliminate the first warning yellow signal and the first red alarm signal;
1.4 Low temperature overpressure protection operations
After pressurizer safety valve mode of operation is switched to low-temperature protection pattern, main coolant system temperature continues to decline, when the transient condition occurred makes main coolant system pressure increase more than 3-5MPa, then trigger Low temperature overpressure alerting signal, and when main coolant system pressure reaches after setting valve 3-5MPa opened by safety valve, release is implemented to described main coolant system;
Heap operating mode overpressure protection opens in step 2, power plant
The overpressure protection operation of 2.1 temperature rise periods
Operator controls power plant and opens heap, makes it from cold shut working conditions change to hot shutdown operating mode, comprises the following steps:
2.1.1 heat up alarm operation
Before power plant's main coolant system intensification starts, pressurizer safety valve mode of operation is in low-temperature protection pattern, when coolant temperature in main coolant system rises to design temperature T
02during=100-140 DEG C, first trigger the second yellow alarm signal heating up and switch;
2.1.2 pressurizer safety valve function blocked operation
If operator responds the second warning yellow, complete intensification blocked operation, and eliminate the second yellow alarm, the second red alarm conductively-closed that Low temperature overpressure is reported to the police and intensification switches simultaneously;
If after triggering the second red alarm heating up and switch, stopping heats up by main coolant system; Wait for that operator completes intensification blocked operation, and after pressurizer safety valve mode of operation is switched to normal protected mode, continue coolant heating in main coolant system, Low temperature overpressure warning function conductively-closed simultaneously;
Described second warning red is that operator does not respond the second warning yellow signal, and in reactor coolant loop, coolant temperature rises to design temperature T
0+=110-150 DEG C, the alerting signal of triggering;
2.1.3 normal warming temperature
After low-temperature protection pattern switches to normal running protection pattern, residual heat removal system is still connected with main coolant system, in this case, relies on remaining row's safety valve to provide overpressure protection, and controls main coolant system continuation intensification;
2.2 hydraulic testing overpressure protections
After power plant's cold-refueling operation terminates, before heap opens in power plant, comprise the following steps:
2.2.1 the cooling medium protection temperature setting the hydraulic testing is T
1=70-120 DEG C;
2.2.2 warming temperature is carried out, when temperature reaches design temperature T according to the temperature rise period overpressure protection operation in above-mentioned steps 2.1
1after, be switched to normal running protection pattern from the low-temperature protection pattern after shutdown;
2.2.3 the hydraulic testing is carried out to reactor coolant loop.
2. open/overpressure protection the method for shutdown condition according to pressurized-water reactor nuclear power plant according to claim 1, it is characterized in that: described normal running protection pattern is that the pattern of setting valve at 16-18MPa opened by the safety valve of voltage stabilizer.
3. open/overpressure protection the method for shutdown condition according to pressurized-water reactor nuclear power plant according to claim 1, it is characterized in that: it is that the function of pressurizer safety valve is switched to low-temperature protection pattern by normal running protection pattern by operator that described cooling switches.
4. open/overpressure protection the method for shutdown condition according to pressurized-water reactor nuclear power plant according to claim 1, it is characterized in that: described low-temperature protection pattern is that the safety valve of voltage stabilizer opens setting valve at 3-5MPa.
5. open/overpressure protection the method for shutdown condition according to pressurized-water reactor nuclear power plant according to claim 1, it is characterized in that: it is that the function of pressurizer safety valve is switched to normal running protection pattern by low-temperature protection pattern by operator that described intensification switches.
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Cited By (9)
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| CN106409360A (en) * | 2016-09-27 | 2017-02-15 | 中广核研究院有限公司 | Method used for achieving nuclear power plant overpressure protection functions |
| CN107887038A (en) * | 2017-11-15 | 2018-04-06 | 中广核工程有限公司 | The cold protection against overpressure method and device of nuclear power station |
| CN110136852A (en) * | 2019-04-30 | 2019-08-16 | 中广核核电运营有限公司 | A kind of one loop of nuclear power station water pressure test overpressure protection system |
| CN110826217A (en) * | 2019-11-01 | 2020-02-21 | 西安交通大学 | Method for calculating safety valve threshold of reactor cold overpressure pressure stabilizer |
| CN111063466A (en) * | 2018-10-30 | 2020-04-24 | 中广核研究院有限公司 | Emergency diesel generator set of nuclear power plant and method for prolonging emergency starting time of emergency diesel generator set |
| CN111255531A (en) * | 2020-01-20 | 2020-06-09 | 岭东核电有限公司 | Method for testing load switch of steam inlet valve of steam turbine of nuclear power station and determining parameters of steam inlet valve |
| CN111508620A (en) * | 2020-04-30 | 2020-08-07 | 中国核动力研究设计院 | Reactor maneuverability self-adjusting method |
| CN111524623A (en) * | 2020-04-30 | 2020-08-11 | 中国核动力研究设计院 | Constant value and arrangement method for safety valve of voltage stabilizer |
| CN113571211A (en) * | 2021-07-06 | 2021-10-29 | 中国核电工程有限公司 | Reactor overpressure protection system and method, nuclear power system and primary loop system thereof |
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| CN106409360A (en) * | 2016-09-27 | 2017-02-15 | 中广核研究院有限公司 | Method used for achieving nuclear power plant overpressure protection functions |
| CN107887038A (en) * | 2017-11-15 | 2018-04-06 | 中广核工程有限公司 | The cold protection against overpressure method and device of nuclear power station |
| CN107887038B (en) * | 2017-11-15 | 2020-02-14 | 中广核工程有限公司 | Cold overpressure protection method and device for nuclear power station |
| CN111063466A (en) * | 2018-10-30 | 2020-04-24 | 中广核研究院有限公司 | Emergency diesel generator set of nuclear power plant and method for prolonging emergency starting time of emergency diesel generator set |
| CN110136852B (en) * | 2019-04-30 | 2020-08-07 | 中广核核电运营有限公司 | Nuclear power station primary loop hydrostatic test overpressure protection system |
| CN110136852A (en) * | 2019-04-30 | 2019-08-16 | 中广核核电运营有限公司 | A kind of one loop of nuclear power station water pressure test overpressure protection system |
| CN110826217A (en) * | 2019-11-01 | 2020-02-21 | 西安交通大学 | Method for calculating safety valve threshold of reactor cold overpressure pressure stabilizer |
| CN111255531A (en) * | 2020-01-20 | 2020-06-09 | 岭东核电有限公司 | Method for testing load switch of steam inlet valve of steam turbine of nuclear power station and determining parameters of steam inlet valve |
| CN111508620A (en) * | 2020-04-30 | 2020-08-07 | 中国核动力研究设计院 | Reactor maneuverability self-adjusting method |
| CN111524623A (en) * | 2020-04-30 | 2020-08-11 | 中国核动力研究设计院 | Constant value and arrangement method for safety valve of voltage stabilizer |
| CN111508620B (en) * | 2020-04-30 | 2023-03-24 | 中国核动力研究设计院 | Reactor maneuverability self-adjusting method |
| CN113571211A (en) * | 2021-07-06 | 2021-10-29 | 中国核电工程有限公司 | Reactor overpressure protection system and method, nuclear power system and primary loop system thereof |
| CN113571211B (en) * | 2021-07-06 | 2023-12-19 | 中国核电工程有限公司 | Nuclear power system and method and primary loop system thereof as well as reactor overpressure protection system and method |
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