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CN-121983359-A - Method, equipment and storage medium for casting low-pressure safety injection system of unit

CN121983359ACN 121983359 ACN121983359 ACN 121983359ACN-121983359-A

Abstract

The invention relates to the technical field of nuclear power, in particular to a method, equipment and a storage medium for casting a low-pressure safety injection system of a unit. A low-pressure safety injection system operation method of a unit comprises the steps of S10, S20, judging whether the system temperature is lower than a preset temperature and whether the system pressure is in a preset interval, S30, switching a low-pressure safety injection system to a waste heat discharging mode if the system temperature is lower than the preset temperature and the system pressure is in the preset interval, and S40, taking water from the loop, and preheating the low-pressure safety injection system to a preset preheating temperature. According to the invention, whether the low-pressure safety injection system can be switched to the waste heat discharging mode is judged by acquiring the system temperature and the system pressure of the loop, the low-pressure safety injection system is preheated to the preset preheating temperature by taking water from the loop, and the low-pressure safety injection system is switched to the waste heat discharging mode in advance, so that the heat energy in the system is effectively utilized, the input of external energy sources is reduced, the running cost is reduced, and the maintenance time is shortened.

Inventors

  • FAN KE
  • HU RUTIAN
  • Fang Zongqun
  • QU XIAOGUANG
  • LIU ZHENGJIANG
  • WANG YAODONG
  • GAO JIAWEI
  • DU LE
  • LIANG JIANHUA

Assignees

  • 中广核惠州核电有限公司
  • 深圳中广核工程设计有限公司

Dates

Publication Date
20260505
Application Date
20260114

Claims (10)

  1. 1. The method for operating the low-pressure safety injection system of the unit is characterized by comprising the following steps of: Step S10, acquiring the system temperature and the system pressure of a loop; step S20, judging whether the system temperature is lower than a preset temperature and whether the system pressure is in a preset interval; step S30, if the system temperature is lower than the preset temperature and the system pressure is within the preset interval, switching the low-pressure safety injection system to a waste heat discharge mode; And S40, taking water from the first loop to preheat the low-pressure safety injection system to a preset preheating temperature.
  2. 2. The method of claim 1, wherein the low pressure safety injection system further comprises column C; The commissioning method further comprises: and acquiring a loop temperature, and connecting the C-row low-pressure injection system with a loop if the loop temperature is lower than the preset loop temperature.
  3. 3. The method of low pressure safety injection system operation of claim 1, further comprising: Controlling the water taking rate from the primary loop according to the temperature of the low-pressure safety injection system; And in the step S40, controlling the low-pressure injection pump inlet of the first loop and the mixing point in the preset range of the output valve outlet of the first loop system to stir until the preheating is completed.
  4. 4. The method of claim 3, wherein the mixing point comprises a tee at the inlet of the low pressure injection pump to a first or second downstream elbow and a tee at the outlet of the output valve to a first or second downstream elbow, and the mixing point is no less than 1m in length.
  5. 5. The method of claim 1, wherein the predetermined temperature is less than or equal to 180 ℃.
  6. 6. The method for operating a low pressure safety injection system according to claim 1, the method is characterized in that the preset interval is 2.4MPa abs~3.4MPa abs.
  7. 7. The method of claim 1, wherein the predetermined loop temperature is less than or equal to 100 ℃.
  8. 8. The method of claim 1, wherein the primary loop inlet safety threshold is 5.6mpa.a.
  9. 9. A computer device comprising a memory and a processor; the memory stores a computer program; the processor performs the steps of the low pressure safety injection system operation method of the unit according to any one of claims 1 to 8 by calling the computer program stored in the memory.
  10. 10. A computer storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the low pressure safety injection system commissioning method of the unit of any one of claims 1-8.

Description

Method, equipment and storage medium for casting low-pressure safety injection system of unit Technical Field The invention relates to the technical field of nuclear power, in particular to a method, equipment and a storage medium for casting a low-pressure safety injection system of a unit. Background The asymmetric decoupling design can isolate coupling disturbance between secondary side systems, prevent faults or fluctuation of a secondary loop system from being transmitted to a primary loop, and improve the disturbance rejection capability and the safety of the integral operation of the nuclear power station. However, the secondary side decoupling asymmetric method has the following problems during operation: The RIS/RHR access temperature of the asymmetric method is 115-120 ℃, and the air exhaust valve is insufficient in heat carrying capacity in the downlink stage of the unit and cannot realize symmetric operation. When the unit goes down, the primary cooling loop is required to be cooled to RIS/RHR access temperature through the GCT, and the conventional island method can be decoupled after RIS/RHR access, so that the major repair period is delayed, and compared with a conventional island maintenance window of about 1 day for the CPR unit, the major repair period is delayed. Challenges are presented to the actual operational flexibility and safety of the unit. For example, when the first circuit is stabilized at a thermal shutdown and the second circuit is disassembled for maintenance, the first circuit needs to be retracted for the first circuit reason, and the first circuit cannot be retracted normally due to the fact that the air exhaust valve cannot cool the first circuit to 120 ℃, so that the first circuit has to be cooled by using the special safety device VDA. The asymmetric method excessively depends on availability of two loop systems such as GCT/CEX/CVI/CET and the like in descending, and the GCT and the like are designed according to non-nuclear safety level, faults such as GCT unavailability and the like are easy to occur, after GCT unavailability, an empty exhaust valve cannot be used for cooling a loop to RIS/RHR connection, for example, 7 GCT valve fault events occur in total after Taishan debugging, and nuclear safety is threatened. Disclosure of Invention The invention aims to solve the technical problem of providing a low-pressure safety injection system operation method, equipment and storage medium of a unit. The invention solves the technical problems by adopting a technical method that the low-pressure safety injection system of a unit is put into operation, comprising the following steps: Step S10, acquiring the system temperature and the system pressure of a loop; step S20, judging whether the system temperature is lower than a preset temperature and whether the system pressure is in a preset interval; step S30, if the system temperature is lower than the preset temperature and the system pressure is within the preset interval, switching the low-pressure safety injection system to a waste heat discharge mode; And S40, taking water from the first loop to preheat the low-pressure safety injection system to a preset preheating temperature. Optionally, the low pressure safety injection system further comprises a column C; The commissioning method further comprises: and acquiring a loop temperature, and connecting the C-row low-pressure injection system with a loop if the loop temperature is lower than the preset loop temperature. Optionally, the method further comprises: Controlling the water taking rate from the primary loop according to the temperature of the low-pressure safety injection system; And in the step S40, controlling the low-pressure injection pump inlet of the first loop and the mixing point in the preset range of the output valve outlet of the first loop system to stir until the preheating is completed. Optionally, the mixing point comprises a tee at the inlet of the low-pressure injection pump to a first or second elbow at the downstream and a tee at the outlet of the output valve to the first or second elbow at the downstream, and the length of the mixing point is not less than 1m. Optionally, the preset temperature is less than or equal to 180 ℃. Optionally, the preset interval is 2.4MPa abs~3.4MPa abs. Optionally, the preset loop temperature is less than or equal to 100 ℃. Optionally, the primary loop inlet safety threshold is 5.6mpa.a. The invention also provides a computer device comprising a memory and a processor; the memory stores a computer program; The processor performs the steps of the low pressure safety injection system operation method of the machine set according to any one of the above by calling the computer program stored in the memory. The invention also provides a computer storage medium having stored thereon a computer program which when executed by a processor performs the steps of the low pressure safety injection system commissioning metho