CN115407724A - Overpressure protection method for primary loop hydrostatic test of nuclear power station - Google Patents
Overpressure protection method for primary loop hydrostatic test of nuclear power station Download PDFInfo
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
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- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
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- G21C17/00—Monitoring; Testing ; Maintaining
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of overpressure protection during a primary circuit hydrostatic test of a nuclear power plant, and particularly relates to a simple and effective method for realizing overpressure protection of a primary circuit hydrostatic test under the condition that the whole primary circuit needs the hydrostatic test after overhaul of a nuclear power plant. Connecting measuring signals of four pressure meters into a DCS signal acquisition cabinet, writing a designed overpressure protection set value into DCS software, processing and operating the acquired signals according to the overpressure protection set value by the DCS software, and opening a pressure release valve to release pressure or stopping a hydraulic test pump to prevent a primary circuit from overpressure when a measured value of pressure exceeds the set value; and (5) carrying out a preliminary experiment of a primary circuit hydraulic pressure test. The invention can avoid the accidental pressure relief of the primary circuit caused by the misoperation of the protection system during the overpressure or pressure rise of the primary circuit, and finally the water pressure failure of the whole primary circuit.
Description
Technical Field
The invention belongs to the technical field of overpressure protection during a primary circuit hydrostatic test of a nuclear power plant, and particularly relates to a simple and effective method for realizing overpressure protection of a primary circuit hydrostatic test under the condition that the whole primary circuit needs the hydrostatic test after overhaul of a nuclear power plant.
Background
The purpose of the primary circuit hydraulic test of the nuclear power station is to ensure that the reactor coolant system is subjected to a proper hydraulic test pressure higher than the normal operation pressure so as to prove that the primary circuit system of the reactor is safe under the normal operation and designed accident conditions in the period from the end of the test to the implementation of the next test and meet the requirements of nuclear safety regulations. According to nuclear safety regulations: the interval between the two hydrostatic tests must not exceed 10 years, but the first hydrostatic test must be completed within 30 months after the first test.
Therefore, the nuclear power station should execute a primary circuit hydraulic test in the engineering construction stage and the overhaul stage, and the main risk in the test is that the primary circuit is subjected to accidental pressure relief caused by misoperation of a protection system during primary circuit overpressure or pressure rise, and finally the whole hydraulic pressure fails. During the test, the pressure of the primary circuit needs to be increased to 20.6MPa (1.2 times of the design pressure), if the overpressure is light, the service life of primary equipment of the primary circuit is influenced, and if the overpressure is heavy, the boundary of the primary circuit is damaged, and a large amount of radioactive substances leak. In order to prevent the primary circuit from being accidentally decompressed during the primary circuit hydraulic pressure test, a safety valve for primary circuit overpressure protection is locked during operation, and cannot play a role of overpressure protection, so that how to establish a set of overpressure protection method with high stability and strong operability becomes an important problem.
Disclosure of Invention
The invention aims to provide a method for overpressure protection of a primary circuit hydraulic pressure test of a nuclear power station, which is high in stability and strong in operability, so that accidental pressure relief of the primary circuit caused by misoperation of a protection system during primary circuit overpressure or pressure rise is avoided, and finally, hydraulic pressure failure of the whole primary circuit is caused.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for overpressure protection of a primary circuit hydrostatic test of a nuclear power station,
the method comprises the following steps: preparing four pressure gauges with different measuring ranges, wherein the measuring range of the first pressure gauge is 0-25 MPa, the measuring range of the second pressure gauge is 15-25 MPa, the measuring range of the third pressure gauge is 0-40 MPa, and the measuring range of the fourth pressure gauge is 11-18 MPa;
step two: the four pressure gauges are respectively arranged at the appointed position of a loop for pressure measurement, a first pressure gauge and a second pressure gauge are independently led out from the negative pressure side of a liquid level measuring instrument of the voltage stabilizer for installation, a third pressure gauge is arranged at the highest point of the voltage stabilizer, and the fourth pressure gauge is original equipment of a process system and does not need to be installed again;
step three: after the pressure gauge is installed, the pressure gauge is put into operation, the installed pressure gauge pipeline is added to the hydrostatic test pressure, whether leakage exists or not is observed, if leakage exists, treatment is needed, and pressure maintaining and testing are needed to be carried out again after each treatment until leakage does not occur any more;
step four: connecting measuring signals of four pressure meters into a DCS signal acquisition cabinet, writing a designed overpressure protection set value into DCS software, processing and operating the acquired signals according to the overpressure protection set value by the DCS software, and opening a pressure release valve to release pressure or stopping a hydraulic test pump to prevent a primary circuit from overpressure when a measured value of pressure exceeds the set value;
performing a preliminary experiment of a loop hydrostatic test;
step five: pressurizing to a third pressure gauge to display 2.5MPa, and respectively recording the readings of four pressure gauges;
step six: pressurizing to a third pressure gauge to display 7MPa, and respectively recording the readings of the four pressure gauges;
step seven: pressurizing to a third pressure gauge to display 10MPa, and respectively recording the readings of the four pressure gauges;
step eight: pressurizing to a third pressure gauge to display 15.4MPa, and respectively recording the readings of the four pressure gauges; continuously increasing the pressure until the third pressure gauge displays 16.8MPa, comparing the pressure measured by the fourth pressure gauge with the set value of 16.8MPa in the DCS software, and when the measured pressure exceeds the set value of 16.8MPa, generating an alarm in the DCS software by the fourth pressure gauge to remind that the pressure of the loop is abnormally increased at the moment;
step nine: pressurizing to a third pressure gauge to display 17.2MPa, and respectively recording the readings of the four pressure gauges; the pressure measured by the fourth pressure gauge is compared with a set value of 17.2MPa in DCS software, and when the measured pressure exceeds the set value of 17.2MPa in the DCS software, the fourth pressure gauge generates a control command for opening a loop pressure relief valve in the DCS software to realize pressure relief;
step ten: locking a fourth pressure gauge in DCS software to measure pressure exceeding a set value of 17.2MPa and generating a control command for opening a loop pressure relief valve;
step eleven: pressurizing to a third pressure gauge to display 20.6MPa, and respectively recording the readings of the four pressure gauges; continuously boosting the pressure until a third pressure gauge displays 21.0MPa, comparing the pressure measured by the first pressure gauge with the set value of 21.0MPa in DCS software, and when the measured pressure exceeds the set value of 21.0MPa, generating a control command for stopping the operation of the hydrostatic test pump in the DCS software by the first pressure gauge, stopping the operation of the hydrostatic test pump, stopping boosting the pressure of a primary circuit, and avoiding the overpressure of the primary circuit; if the third pressure gauge shows that the pressure continues to rise to 21.2MPa, the measured value of the second pressure gauge is compared with the set value of 21.2MPa in the DCS software, and the second pressure gauge generates a control command for opening a loop pressure relief valve in the DCS software to realize pressure relief;
step twelve: when the pressure of the third pressure gauge is released to 15.4MPa, the pressure measured by the fourth pressure gauge is recovered to exceed a set value of 17.2MPa in DCS software to generate a control command for opening a pressure release valve of the primary circuit, and the pressure is continuously reduced to 0MPa;
step thirteen: the overpressure protection function is normally executed through simulation verification of the fifth step to the twelfth step, and the four pressure gauges enter a formal hydrostatic test when the readings of the four pressure gauges are consistent at 2.5MPa, 7MPa, 10MPa, 15.4MPa, 17.2MPa and 20.6MPa;
fourteen steps: and entering the formal hydrostatic test, namely, only the manual pressurization in the fifth step to the twelfth step is replaced by pressurization of a formal hydrostatic test pump, and the fifth step to the twelfth step are repeatedly executed to realize overpressure protection of the primary hydrostatic test.
Step two: after the pressure gauge is installed, the measuring range of the pressure gauge needs to be transferred according to the actual height of the site.
Step three: the installed pressure gauge line was added to the hydrostatic test pressure by a manual booster pump.
Step three: the installed pressure gauge line was brought to hydrostatic test pressure and held for 10 minutes.
Step five: the pressure is increased to a third pressure gauge by a manual pressure pump, and the third pressure gauge shows 2.5MPa.
Step six: the pressure is increased by a manual pressure pump to a third pressure gauge which displays 7MPa.
Step seven: the pressure is increased by a manual pressure pump to a third pressure gauge which displays 10MPa.
Step eight: pressurizing to a third pressure gauge by a manual pressurizing pump to display 15.4MPa; the pressure is increased continuously by the manual booster pump until a third pressure gauge displays 16.8MPa.
Step nine: the pressure was increased by a manual pressure pump to a third pressure gauge indicating 17.2MPa.
Step eleven: pressurizing to a third pressure gauge by a manual pressurizing pump to display 20.6MPa; the pressure is continuously increased by the manual pressure pump until a third pressure gauge displays 21.0MPa.
The beneficial effects obtained by the invention are as follows:
1) The overpressure protection is realized through a digital DCS system, software is convenient to write in, data during the test period can be displayed and stored in real time, and the data traceability is strong.
2) Carrying out a preliminary experiment before a hydrostatic test: the method mainly verifies the correctness of no leakage and overpressure logic of the pressure transmitter interface, and can effectively avoid the failure of the primary circuit hydraulic test caused by the problems in the installation, range setting and protection logic link of the pressure transmitter during the formal hydraulic test.
3) According to the method, the pressure of the loop is measured by adopting the plurality of pressure transmitters, so that the test failure caused by single fault of the pressure transmitters can be effectively avoided.
4) The temporary instruments are all installed at the places where the nuclear island environment dosage rate is low, and the irradiation dosage of workers is effectively reduced.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The method for overpressure protection of the primary circuit hydrostatic test of the nuclear power station comprises the following steps:
the method comprises the following steps: preparing four pressure gauges with different measuring ranges, wherein the measuring range of the first pressure gauge is 0-25 MPa, the measuring range of the second pressure gauge is 15-25 MPa, the measuring range of the third pressure gauge is 0-40 MPa, the measuring range of the fourth pressure gauge is 11-18 MPa,
step two: the four pressure gauges are respectively arranged at the designated position of a loop for pressure measurement, a first pressure gauge and a second pressure gauge are independently led out from the negative pressure side of the liquid level measuring instrument of the voltage stabilizer for one instrument pipeline to be arranged, a third pressure gauge is arranged at the highest point of the voltage stabilizer, and the fourth pressure gauge is original equipment of a process system and does not need to be arranged again. After the pressure gauge is installed, the measuring range of the pressure gauge needs to be transferred according to the actual height of the site.
Step three: the back that finishes is installed the manometer, with the manometer commissioning, through manual force (forcing) pump, adds to the hydrostatic test pressure to the manometer pipeline that installs to pressurize 10 minutes, observe whether there is revealing, if reveal and need handle (all need carry out the pressurize pressure testing again after handling each time and no longer appear leaking).
Step four: and (3) connecting the measuring signals of the four pressure meters in the first step into a DCS signal acquisition cabinet, writing the designed overpressure protection set value into DCS software, processing and operating the acquired signals according to the overpressure protection set value by the DCS software, and opening the pressure release valve to release pressure or stopping the hydraulic test pump when the measured value of the pressure exceeds the set value to prevent the overpressure of a primary circuit.
Performing a preliminary experiment of a loop hydrostatic test;
step five: pressurizing to a third pressure gauge by a manual pressurizing pump to display 2.5MPa, and respectively recording the readings of the four pressure gauges in the step one.
Step six: pressurizing to a third pressure gauge by a manual pressurizing pump to display 7MPa, and respectively recording the readings of the four pressure gauges in the step one.
Step seven: pressurizing to a third pressure gauge by a manual pressurizing pump to display 10MPa, and respectively recording the readings of the four pressure gauges in the step one.
Step eight: pressurizing to a third pressure gauge by a manual pressurizing pump to display 15.4MPa, and respectively recording the readings of the four pressure gauges in the step one; and continuously boosting the pressure by using the manual booster pump until a third pressure gauge displays 16.8MPa, comparing the pressure measured by a fourth pressure gauge with a set value of 16.8MPa in DCS software, and when the measured pressure exceeds the set value (16.8 MPa), generating an alarm in the DCS software by the fourth pressure gauge to remind that the pressure of the loop is abnormally increased at the moment.
Step nine: pressurizing to a third pressure gauge by a manual pressurizing pump to display 17.2MPa, and respectively recording the readings of the four pressure gauges in the step one; the pressure measured by the fourth pressure gauge is compared with a set value of 17.2MPa in DCS software, and when the measured pressure exceeds the set value (17.2 MPa) in the DCS software, the fourth pressure gauge generates a control command for opening a primary circuit pressure relief valve in the DCS software to realize pressure relief.
Step ten: and locking a fourth pressure gauge in DCS software to measure that the pressure exceeds a set value (17.2 MPa) so as to generate a control command for opening a primary circuit pressure relief valve.
Step eleven: pressurizing to a third pressure gauge by a manual pressurizing pump to display 20.6MPa, and respectively recording the readings of the four pressure gauges in the step one; continuously boosting the pressure of the first pressure gauge to a third pressure gauge to display 21.0MPa through the manual pressurizing pump, comparing the pressure measured by the first pressure gauge with a set value of 21.0MPa in DCS software, and when the measured pressure exceeds the set value (21.0 MPa), generating a control command for stopping the operation of the hydrostatic test pump in the DCS software by the first pressure gauge, stopping the operation of the hydrostatic test pump, stopping boosting the pressure of the primary loop, and avoiding the overpressure of the primary loop; if the third pressure gauge displays that the pressure continues to rise to 21.2MPa, the measured value of the second pressure gauge is compared with the set value of 21.2MPa in the DCS software, and the second pressure gauge generates a control command for opening a loop pressure relief valve in the DCS software to realize pressure relief.
Step twelve: when the pressure of the third pressure gauge is released to 15.4MPa, the pressure measured by the fourth pressure gauge exceeds a set value by 17.2MPa, a control command for opening a loop pressure release valve is generated in DCS software, and the pressure is continuously reduced to 0MPa;
step thirteen: the overpressure protection function can be normally executed through simulation verification of the fifth step to the twelfth step, and the formal hydrostatic test can be carried out when the readings of the four pressure gauges are consistent on the platforms of 2.5MPa, 7MPa, 10MPa, 15.4MPa, 17.2MPa and 20.6 MPa.
Fourteen steps: and entering the formal hydrostatic test, namely, only the manual pressurizing pump in the fifth step to the twelfth step is pressurized and replaced by the formal hydrostatic test pump for pressurization, and the overpressure protection of the primary hydrostatic test can be realized by repeatedly executing the fifth step to the twelfth step.
Claims (10)
1. A method for overpressure protection of a primary circuit hydraulic test of a nuclear power station is characterized by comprising the following steps:
the method comprises the following steps: preparing four pressure gauges with different measuring ranges, wherein the measuring range of the first pressure gauge is 0-25 MPa, the measuring range of the second pressure gauge is 15-25 MPa, the measuring range of the third pressure gauge is 0-40 MPa, and the measuring range of the fourth pressure gauge is 11-18 MPa;
step two: the four pressure gauges are respectively arranged at the appointed position of a loop for pressure measurement, a first pressure gauge and a second pressure gauge are installed by independently leading out a line of instrument pipeline at the negative pressure side of a liquid level measuring instrument of the voltage stabilizer, a third pressure gauge is arranged at the highest point of the voltage stabilizer, and the fourth pressure gauge is original equipment of a process system and does not need to be installed again;
step three: after the pressure gauge is installed, the pressure gauge is put into operation, the installed pressure gauge pipeline is added to the hydrostatic test pressure, whether leakage exists or not is observed, if leakage exists, treatment is needed, and pressure maintaining and testing are needed to be carried out again after each treatment until leakage does not occur any more;
step four: connecting measuring signals of four pressure meters into a DCS signal acquisition cabinet, writing a designed overpressure protection set value into DCS software, processing and operating the acquired signals according to the overpressure protection set value by the DCS software, and opening a pressure release valve to release pressure or stopping a hydraulic test pump to prevent a primary circuit from overpressure when a measured value of pressure exceeds the set value;
performing a preliminary experiment of a loop hydrostatic test;
step five: pressurizing to a third pressure gauge which displays 2.5MPa, and respectively recording the readings of four pressure gauges;
step six: pressurizing to a third pressure gauge to display 7MPa, and respectively recording the readings of the four pressure gauges;
step seven: pressurizing to a third pressure gauge to display 10MPa, and respectively recording the readings of the four pressure gauges;
step eight: pressurizing to a third pressure gauge to display 15.4MPa, and respectively recording the readings of the four pressure gauges; continuously increasing the pressure until the third pressure gauge displays 16.8MPa, comparing the pressure measured by the fourth pressure gauge with the set value of 16.8MPa in the DCS software, and when the measured pressure exceeds the set value of 16.8MPa, generating an alarm in the DCS software by the fourth pressure gauge to remind that the pressure of the loop is abnormally increased at the moment;
step nine: pressurizing to a third pressure gauge to display 17.2MPa, and respectively recording the readings of the four pressure gauges; the pressure measured by the fourth pressure gauge is compared with a set value of 17.2MPa in DCS software, and when the measured pressure exceeds the set value of 17.2MPa in the DCS software, the fourth pressure gauge generates a control command for opening a loop pressure relief valve in the DCS software to realize pressure relief;
step ten: locking a fourth pressure gauge in DCS software to measure pressure exceeding a set value of 17.2MPa and generating a control command for opening a loop pressure relief valve;
step eleven: pressurizing to a third pressure gauge to display 20.6MPa, and respectively recording the readings of the four pressure gauges; continuously boosting the pressure until a third pressure gauge displays 21.0MPa, comparing the pressure measured by the first pressure gauge with the set value of 21.0MPa in DCS software, and when the measured pressure exceeds the set value of 21.0MPa, generating a control command for stopping the operation of the hydrostatic test pump in the DCS software by the first pressure gauge, stopping the operation of the hydrostatic test pump, stopping boosting the pressure of a primary circuit, and avoiding the overpressure of the primary circuit; if the third pressure gauge displays that the pressure continues to rise to 21.2MPa, the measured value of the second pressure gauge is compared with the set value of 21.2MPa in the DCS software, and the second pressure gauge generates a control command for opening a loop pressure relief valve in the DCS software to realize pressure relief;
step twelve: when the pressure of the third pressure gauge is released to 15.4MPa, the pressure measured by the fourth pressure gauge is recovered to exceed a set value of 17.2MPa in DCS software to generate a control command for opening a pressure release valve of the primary circuit, and the pressure is continuously reduced to 0MPa;
step thirteen: the overpressure protection function is normally executed through simulation verification of the fifth step to the twelfth step, and the four pressure gauges enter a formal hydrostatic test when the readings of the four pressure gauges are consistent at 2.5MPa, 7MPa, 10MPa, 15.4MPa, 17.2MPa and 20.6MPa;
fourteen steps: and entering the formal hydrostatic test, namely, only the manual pressurization in the fifth step to the twelfth step is replaced by pressurization of a formal hydrostatic test pump, and the fifth step to the twelfth step are repeatedly executed to realize overpressure protection of the primary hydrostatic test.
2. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step two: after the pressure gauge is installed, the measuring range of the pressure gauge needs to be transferred according to the actual height of the site.
3. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step three: the installed pressure gauge line was added to the hydrostatic test pressure by a manual booster pump.
4. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step three: the installed pressure gauge line was brought to hydrostatic test pressure and held for 10 minutes.
5. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step five: the pressure is increased by a manual pressure pump to a third pressure gauge which shows 2.5MPa.
6. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step six: and pressurizing to a third pressure gauge by a manual pressurizing pump to display 7MPa.
7. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step seven: the pressure is increased by a manual pressure pump to a third pressure gauge which displays 10MPa.
8. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step eight: pressurizing to a third pressure gauge by a manual pressurizing pump to display 15.4MPa; the pressure is increased continuously by the manual booster pump until a third pressure gauge displays 16.8MPa.
9. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step nine: the pressure was increased by a manual pressure pump to a third pressure gauge indicating 17.2MPa.
10. The method for nuclear power plant primary loop hydrostatic test overpressure protection of claim 1, wherein: step eleven: pressurizing by a manual pressurizing pump until a third pressure gauge shows 20.6MPa; the pressure is continuously increased by the manual pressure pump until a third pressure gauge displays 21.0MPa.
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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 |
| 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 |
| CN111458231A (en) * | 2020-04-28 | 2020-07-28 | 浙江石油化工有限公司 | System and method for hydraulic pressure test of high-pressure pipeline of hydrocracking device |
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