A continuous spray regulating method for a nuclear power unit pressure regulator

Abstract

This invention relates to a continuous spray regulation method for a nuclear power unit pressurizer, comprising the following steps: performing pre-test state settings for a steam generator auxiliary feedwater system pump test; after completing the pre-test state settings for the steam generator auxiliary feedwater system pump test, performing pre-test state settings for continuous spray regulation of the pressurizer; performing initial state settings for the continuous spray regulation test of the pressurizer; and after completing the initial state settings, performing fine-tuning for the continuous spray regulation test of the pressurizer. The continuous spray regulation method for the pressurizer of this invention eliminates the coarse-tuning portion during execution, avoiding mutual interference between coarse-tuning and the steam generator auxiliary feedwater system pump test, significantly reducing test time. Furthermore, it can quickly locate the initial point for fine-tuning, greatly reducing fine-tuning time. Since it does not interfere with the steam generator auxiliary feedwater system pump test, it reduces unit risk and reliably completes the continuous spray regulation of the pressurizer.

Description

Technical Field

[0001] This invention relates to the technical field of nuclear power plant voltage regulators, and more specifically, to a continuous spray regulation method for a nuclear power plant voltage regulator. Background Technology

[0002] The continuous spray flow regulation of the pressurizer in a nuclear power unit is usually a test scheduled to be carried out during the overhaul. The test regulation is difficult and time-consuming, and often occupies the critical path of the overhauled unit.

[0003] The continuous spray flow regulation test of the pressure regulator is divided into two parts: coarse adjustment and fine adjustment. The coarse adjustment is performed using the steam generator auxiliary feedwater system (ASG) test window, and the fine adjustment is performed after the ASG test is completed. This inevitably requires occupying the critical path, which takes a long time. Moreover, it is difficult to achieve the purpose by performing coarse adjustment during the ASG test, which significantly increases the difficulty and risk of the test. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a continuous spray regulation method for a nuclear power unit voltage regulator.

[0005] The technical solution adopted by this invention to solve its technical problem is: constructing a continuous spray regulation method for a nuclear power unit voltage regulator, comprising the following steps:

[0006] Pre-test status settings for performing steam generator auxiliary feedwater system pump tests;

[0007] After completing the pre-test state settings for the steam generator auxiliary feedwater system pump test, perform the pre-test state settings for the continuous spray regulation of the pressure regulator.

[0008] Initial state settings for the continuous spray adjustment test of the voltage regulator;

[0009] After completing the initial state settings, fine-tuning of the voltage regulator's continuous spray adjustment test is performed.

[0010] In the continuous spray regulation method for the pressurizer of a nuclear power unit described in this invention, the pre-test state setting of the auxiliary feedwater system pump of the steam generator includes:

[0011] During the stabilization period of the steam generator auxiliary feedwater system pump test:

[0012] Set the spray valve of the primary coolant system pressure regulator to automatic control mode;

[0013] Set the pressure controller of the primary coolant system regulator to automatic control mode;

[0014] Put the voltage regulator heater into operation;

[0015] The on / off type heater of the primary coolant system regulator and the proportional type heater of the first primary coolant system regulator are put into operation.

[0016] In the continuous spray regulation method for a nuclear power unit pressurizer according to the present invention, the pre-test state setting for performing continuous spray regulation of the pressurizer includes:

[0017] Monitor the water level and charging flow of the pressure stabilizer to ensure that the water level of the pressure stabilizer reaches the set water level and the charging flow meets the adjustment margin;

[0018] Keep the spray valve of the primary coolant system pressure regulator in automatic control mode;

[0019] Keep the pressure controller of the primary coolant system regulator in automatic control mode;

[0020] Keep the on / off heater of the primary coolant system regulator in operation;

[0021] The voltage regulator heater and the first primary circuit coolant system voltage regulator proportional heater are stopped.

[0022] In the continuous spray regulation method for the pressurizer of a nuclear power unit described in this invention, the charging flow rate is the flow rate of the charging pipeline of the chemical and volume control system;

[0023] The charging flow rate meets the adjustment margin requirement of being greater than 6t / h.

[0024] In the continuous spray regulation method for the pressurizer of a nuclear power unit described in this invention, the pre-test state setting for performing continuous spray regulation of the pressurizer after completing the pre-test state setting of the steam generator auxiliary feedwater system pump test includes:

[0025] After completing the pre-test state settings for the steam generator auxiliary feedwater system pump test, and during the one-hour stable operation of the steam generator auxiliary feedwater system pump during the test, the pre-test state settings for continuous spray regulation of the pressure regulator are performed.

[0026] In the continuous spray regulation method for the pressurizer of a nuclear power unit according to the present invention, the initial state setting for performing the continuous spray regulation test of the pressurizer includes:

[0027] Step 1. Switch the spray valve of the primary coolant system pressure regulator from automatic control to manual control, and set the opening of the spray valve of the primary coolant system pressure regulator to the value corresponding to the preset pressure when the pressure is stable in automatic control mode;

[0028] Step 2. Stop the on / off heater of the primary coolant system regulator;

[0029] Step 3. Manually set the pressure controller of the primary coolant system regulator to 0 and then switch back to automatic control mode;

[0030] Step 4. Determine whether the power of the proportional heater of the second primary coolant system regulator meets the requirements; if not, continue to monitor the power of the proportional heater of the second primary coolant system regulator until the requirements are met.

[0031] Step 5. If so, adjust the spray valve of the primary coolant system pressure regulator according to the preset adjustment requirements.

[0032] In the continuous spray regulation method for the nuclear power unit voltage regulator described in this invention, steps 1 to 5 are executed sequentially.

[0033] In the continuous spray regulation method for the pressurizer of a nuclear power unit according to the present invention, the step of adjusting the spray valve of the pressurizer of the primary coolant system according to preset regulation requirements includes:

[0034] Increase the opening of the spray valve of the pressure regulator in the primary coolant system to the set opening.

[0035] After increasing the opening of the spray valve of the primary coolant system regulator to the set opening, the opening of the spray valve of the primary coolant system regulator is then decreased according to the set opening.

[0036] In the continuous spray regulation method for the pressurizer of a nuclear power unit according to the present invention, the fine-tuning of the continuous spray regulation test of the pressurizer includes:

[0037] Perform fine-tuning of the spray valve of the primary coolant system pressure regulator, and simultaneously monitor the spray line temperature and the rate of temperature change.

[0038] Determine whether the power of the proportional heater of the second primary coolant system regulator is within the preset power range;

[0039] If so, then complete the fine-tuning of the continuous spray adjustment test of the voltage regulator;

[0040] If not, continue with fine-tuning the spray valve of the primary coolant system regulator.

[0041] In the continuous spray regulation method for the pressurizer of a nuclear power unit according to the present invention, the fine adjustment of the spray valve of the pressurizer of the primary coolant system includes:

[0042] Each time, the spray valve of the primary coolant system pressure regulator is finely adjusted according to the set reduction range.

[0043] The continuous spray adjustment method for the pressurizer of a nuclear power unit, as described in this invention, has the following beneficial effects: It includes the following steps: setting the pre-test state for the steam generator auxiliary feedwater system pump test; after completing the pre-test state setting for the steam generator auxiliary feedwater system pump test, setting the pre-test state for the continuous spray adjustment of the pressurizer; setting the initial state for the continuous spray adjustment test of the pressurizer; and after completing the initial state setting, performing fine-tuning for the continuous spray adjustment test of the pressurizer. This invention's continuous spray adjustment method for the pressurizer eliminates the coarse-tuning portion during execution, avoiding interference between coarse-tuning and the steam generator auxiliary feedwater system pump test, significantly reducing test time. Furthermore, it can quickly locate the initial point for fine-tuning, greatly reducing fine-tuning time. Since it does not interfere with the steam generator auxiliary feedwater system pump test, it reduces unit risk and reliably completes the continuous spray adjustment of the pressurizer. Attached Figure Description

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0045] Figure 1 This is a schematic flowchart of the continuous spray regulation method for the nuclear power unit voltage regulator provided by the present invention;

[0046] Figure 2 This is a schematic diagram of the initial state setting for the continuous spray adjustment test of the voltage regulator provided by the present invention. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Figure 1 This invention illustrates a preferred embodiment of the continuous spray regulation method for a nuclear power unit pressurizer provided by the present invention. This continuous spray regulation method for the pressurizer can be applied to CPR1000 units.

[0049] Specifically, such as Figure 1 As shown, the continuous spray regulation method for the pressurizer of this nuclear power unit includes the following steps:

[0050] Step S101. Perform the pre-test status settings for the steam generator auxiliary feedwater system pump test.

[0051] Specifically, in this embodiment, the state setting before the test of the steam generator auxiliary feedwater system pump includes: during the stable test period of the steam generator auxiliary feedwater system pump: setting the spray valve (i.e., RCP001 / 002VP) of the primary loop coolant system pressure regulator to automatic control; setting the pressure controller (i.e., RCP401KU) of the primary loop coolant system pressure regulator to automatic control; controlling the pressure regulator heater (i.e., RCP001 / 002RS) to start operation; and controlling the on-off heater (RCP005RS) of the primary loop coolant system pressure regulator and the proportional heater (RCP006RS) of the first primary loop coolant system pressure regulator to start operation.

[0052] In this step, the stability of the steam generator auxiliary feedwater system pump test can be checked by monitoring the pressure regulator water level. If the pressure regulator water level is stable at around -3m, then when the pressure regulator water level is stable at around -3m, set RCP001 / 002VP to automatic control mode and set the primary coolant system pressure regulator pressure controller to automatic control mode. Then, manually operate the pressure regulator heater to start operation. At the same time, manually operate the primary coolant system pressure regulator on / off heater and the first primary coolant system pressure regulator proportional heater to start operation.

[0053] Step S102. After completing the pre-test state setting for the steam generator auxiliary feedwater system pump test, perform the pre-test state setting for the continuous spray regulation of the pressure regulator.

[0054] Specifically, in this embodiment, the pre-test state settings for performing continuous spray regulation of the pressure regulator include: monitoring the water level and charging flow rate of the pressure regulator to ensure that the water level of the pressure regulator reaches the set water level and the charging flow rate meets the regulation margin; keeping the spray valve of the primary coolant system pressure regulator in automatic control mode; keeping the pressure controller of the primary coolant system pressure regulator in automatic control mode; keeping the on / off heater of the primary coolant system pressure regulator in operation mode; and controlling the pressure regulator heater and the first primary coolant system pressure regulator proportional heater to stop.

[0055] In this step, after completing the pre-test state settings for the steam generator auxiliary feedwater system pump test, the water level of the pressure regulator is monitored to determine whether it has reached the set water level (e.g., -4m). If the water level of the pressure regulator reaches the set water level, the charging flow rate needs to be monitored simultaneously to ensure a regulation margin. The charging flow rate refers to the flow rate of the charging pipeline in the chemical and volumetric control system. The minimum flow rate for automatic charging flow rate adjustment is 6t / h; therefore, ensuring the charging flow rate is greater than 6t / h is sufficient for regulation and replenishment. Thus, in this embodiment, the charging flow rate meets the regulation margin requirement of being greater than 6t / h. It should be noted that when the primary loop pressure stabilizes at the automatic control setpoint (154 bar.g), the on / off heater of the primary loop coolant system pressure regulator and the pressure regulator heater can be shut down.

[0056] Furthermore, in this step, when the pressure regulator water level is at -4m and there is an adjustment margin, the spray valve and pressure controller of the primary coolant system pressure regulator are kept in automatic control mode, and the on / off heater of the primary coolant system pressure regulator is kept in operation through manual operation. Simultaneously, the pressure regulator heater and the proportional heater of the first primary coolant system pressure regulator are stopped through manual operation. Specifically, when stopping the pressure regulator heater and the proportional heater of the first primary coolant system pressure regulator, the primary circuit pressure must be monitored. That is, before stopping the pressure regulator heater and the proportional heater of the first primary coolant system pressure regulator, the primary circuit pressure must be monitored to prevent the pressure from dropping too quickly and causing the automatic adjustment to fall below 154±1 bar.g.

[0057] Furthermore, in this embodiment, after completing the pre-test state settings for the steam generator auxiliary feedwater system pump test, the pre-test state settings for performing continuous spray regulation of the pressure regulator include: performing the pre-test state settings for continuous spray regulation of the pressure regulator during one hour of stable operation of the steam generator auxiliary feedwater system pump during the test process. That is, this step can be performed during one hour of stable operation of the steam generator auxiliary feedwater system pump.

[0058] Step S103. Perform the initial state setting for the continuous spray adjustment test of the voltage regulator.

[0059] Specifically, in this embodiment, the initial state setting for performing the continuous spray regulation test of the voltage regulator includes the following steps:

[0060] Step 1. Switch the spray valve of the primary coolant system pressure regulator from automatic control to manual control, and set the opening degree of the spray valve to the value corresponding to the preset pressure when the pressure is stable in automatic control mode. Optionally, in this embodiment, the preset pressure is 154 bar.g.

[0061] Step 2. Control the on / off heater of the primary coolant system regulator to stop.

[0062] Step 3. Manually set the pressure controller of the primary coolant system regulator to 0 and then immediately switch back to automatic control. By manually setting the pressure controller of the primary coolant system regulator to 0 and then immediately resuming automatic control, integral deviation can be eliminated.

[0063] Step 4. Determine if the power of the proportional heater (RCP003 / 004RS) of the second primary coolant system regulator meets the requirements; if not, continue monitoring the power of the proportional heater until the requirements are met. Specifically, the requirements are met when the power of the proportional heater reaches 50% or more.

[0064] Step 5. If so, adjust the spray valve of the primary coolant system pressure regulator according to the preset adjustment requirements.

[0065] It should be noted that in this embodiment, steps 1 to 5 are executed sequentially and continuously without interruption.

[0066] In this embodiment, adjusting the spray valve of the primary coolant system pressure regulator according to the preset adjustment requirements includes: increasing the opening of the spray valve of the primary coolant system pressure regulator to a set opening; and after increasing the opening of the spray valve of the primary coolant system pressure regulator to the set opening, decreasing the opening of the spray valve of the primary coolant system pressure regulator to the set opening.

[0067] The opening degree can be set to 3%, that is, when the power of the proportional heater of the second primary coolant system regulator reaches more than 50%, the spray valve of the primary coolant system regulator will be opened by 3% first and then closed by 3%.

[0068] Specifically, the power of RCP005RS is 12×24KW, and the total power of RCP003 / 004RS is 18×24KW. After RCP005RS is switched to RCP003 / 004RS, the actual power of RCP003 / 004RS is about 67% of its rated power. Therefore, the opening of the spray valve of the primary coolant system regulator is kept small when it is in automatic mode, so that the actual power of RCP003 / 004RS is as close as possible to 50%.

[0069] It should be noted that in this embodiment, step S103 is performed during the stabilization period of the steam generator auxiliary feedwater system pump test.

[0070] Step S104. After completing the initial state setting, perform fine-tuning of the continuous spray adjustment test of the voltage regulator.

[0071] Specifically, in this embodiment, the fine-tuning of the continuous spray adjustment test of the pressure regulator includes: fine-tuning the spray valve of the primary coolant system pressure regulator while simultaneously monitoring the spray pipeline temperature and the rate of temperature change; determining whether the power of the proportional heater of the second primary coolant system pressure regulator is within the preset power range; if yes, the fine-tuning of the continuous spray adjustment test of the pressure regulator is completed; if not, the fine-tuning of the spray valve of the primary coolant system pressure regulator continues. Each time, the spray valve of the primary coolant system pressure regulator is fine-tuned according to the set reduction range.

[0072] The preset power range can be 50% ± 15%. The reduction range is set to 0.1-0.2%.

[0073] Specifically, during the fine-tuning of the spray valve of the primary coolant system pressure regulator, the spray valve should be reduced by 0.1-0.2% each time. During the fine-tuning process, the temperature and rate of change of the spray pipeline should be taken into account, and the power of the proportional heater of the secondary primary coolant system pressure regulator should be monitored to see if it is stable at 50% ± 15%. If it is stable at 50% ± 15%, the fine-tuning of the spray valve of the primary coolant system pressure regulator can be considered complete.

[0074] Optionally, in this embodiment, the temperature difference of the spray pipeline is less than 2°C, and the rate change is less than 1°C / h.

[0075] In practical applications, the temperature gauges RCP002 / 003MT for the pipeline where RCP001 / 002VP are located can be set in the main control room. After each adjustment of 0.1-0.2%, the temperature change trend and value should be observed. Ultimately, the temperature of RCP002 / 003MT should be completely stable or the temperature change should be <1℃ / h (trial suggestion, not standard). The temperature difference between the two temperature gauges should be controlled within 2℃.

[0076] When making fine adjustments, the volume can only be reduced in one direction to prevent mechanical dead zones from forming.

[0077] Furthermore, after fine-tuning the locking mechanical stop, the water pressure test pump-diesel generator integrated test shaft seal injection section is then performed to prevent changes in shaft seal injection flow from causing primary circuit pressure fluctuations.

[0078] This invention eliminates the coarse adjustment step during execution, avoiding interference between coarse adjustment and steam generator auxiliary feedwater system pump testing. It can also quickly locate the initial point of fine adjustment (the initial point is the opening degree corresponding to the manual setting of RCP001 / RCP002VP). Moreover, since the initial point of fine adjustment is very close to the final target opening degree, the fine adjustment time can be greatly reduced. This significantly shortens the time occupied by the continuous spray adjustment test of the pressure regulator, or even removes it from the critical path, avoiding the impact of other work during hot shutdown, reducing unit risk, significantly improving work efficiency, and reducing production costs.

[0079] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0080] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0081] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0082] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A continuous spray regulation method for a nuclear power unit pressurizer, characterized in that, Includes the following steps: The pre-test state settings for performing the steam generator auxiliary feedwater system pump test include: during the stabilization period of the steam generator auxiliary feedwater system pump test: setting the spray valve of the primary loop coolant system pressure regulator to automatic control; setting the pressure controller of the primary loop coolant system pressure regulator to automatic control; controlling the pressure regulator heater to start operation; controlling the on-off type heater of the primary loop coolant system pressure regulator and the first primary loop coolant system pressure regulator proportional heater to start operation; After completing the pre-test state settings for the steam generator auxiliary feedwater system pump test, the pre-test state settings for the continuous spray regulation of the pressure regulator are executed. The pre-test state settings for the continuous spray regulation of the pressure regulator include: monitoring the water level and charging flow rate of the pressure regulator to ensure that the water level reaches the set level and the charging flow rate meets the regulation margin; maintaining the spray valve of the primary coolant system pressure regulator in automatic control mode; maintaining the pressure controller of the primary coolant system pressure regulator in automatic control mode; maintaining the on-off heater of the primary coolant system pressure regulator in operation mode; and controlling the pressure regulator heater and the first primary coolant system pressure regulator proportional heater to stop. The initial state setting for the continuous spray adjustment test of the pressure regulator includes: Step 1. Switching the spray valve of the primary coolant system pressure regulator from automatic control to manual control, and setting the opening of the spray valve to the value corresponding to the preset pressure when the pressure is stable in automatic control; Step 2. Stopping the on / off heater of the primary coolant system pressure regulator; Step 3. Manually setting the pressure controller of the primary coolant system pressure regulator to 0 and then re-switching to automatic control; Step 4. Determining whether the power of the proportional heater of the second primary coolant system pressure regulator meets the requirements; if not, continuing to monitor the power of the proportional heater of the second primary coolant system pressure regulator until the requirements are met; Step 5. If yes, adjusting the spray valve of the primary coolant system pressure regulator according to the preset adjustment requirements; After completing the initial state settings, a fine-tuning test of the voltage regulator's continuous spray adjustment is performed; the fine-tuning of the voltage regulator's continuous spray adjustment test includes: Perform fine-tuning of the spray valve of the primary coolant system pressure regulator, and simultaneously monitor the spray line temperature and the rate of temperature change. Determine whether the power of the proportional heater of the second primary coolant system regulator is within the preset power range; if yes, complete the fine adjustment of the continuous spray adjustment test of the regulator; if not, continue to perform fine adjustment of the spray valve of the primary coolant system regulator.

2. The continuous spray regulation method for a nuclear power unit pressurizer according to claim 1, characterized in that, The charge flow rate is the flow rate of the charge pipeline in the chemical and volume control system. The charging flow rate meets the adjustment margin requirement of being greater than 6t / h.

3. The continuous spray regulation method for a nuclear power unit pressurizer according to claim 1, characterized in that, The pre-test state settings for executing continuous spray regulation of the pressure regulator after completing the pre-test state settings for the auxiliary feedwater system pump test of the steam generator include: After completing the pre-test state settings for the steam generator auxiliary feedwater system pump test, and during the one-hour stable operation of the steam generator auxiliary feedwater system pump during the test, the pre-test state settings for continuous spray regulation of the pressure regulator are performed.

4. The continuous spray regulation method for a nuclear power unit pressurizer according to claim 1, characterized in that, Steps 1 through 5 are executed sequentially.

5. The continuous spray regulation method for a nuclear power unit pressurizer according to claim 1, characterized in that, The adjustment of the spray valve of the primary coolant system pressure regulator according to the preset adjustment requirements includes: Increase the opening of the spray valve of the pressure regulator in the primary coolant system to the set opening. After increasing the opening of the spray valve of the primary coolant system regulator to the set opening, the opening of the spray valve of the primary coolant system regulator is then decreased according to the set opening.

6. The continuous spray regulation method for a nuclear power unit pressurizer according to claim 1, characterized in that, The fine-tuning of the spray valve of the primary coolant system regulator includes: Each time, the spray valve of the primary coolant system pressure regulator is finely adjusted according to the set reduction range.

Images