A method and system for physical test of CPR unit power increase

Abstract

The present application relates to a kind of CPR machine group power physical test method and system, comprising the following steps: obtaining the real-time power of unit;Judge whether the power of unit reaches target power;If yes, then wait for a predetermined period of time;After reaching the predetermined period of time, a first group of physical tests are executed synchronously;When the first group of physical tests starts to execute, start timing, and obtain the first monitoring time;Determine whether the end time of the first group of physical tests is reached;If the end time of the first group of physical tests is reached, then a second group of physical tests are executed synchronously;When the second group of physical tests starts to execute, start timing, and obtain the second monitoring time;Determine whether the end time of the second group of physical tests is reached according to the second monitoring time;If the end time of the second group of physical tests is reached, then perform the protection setting value modification test of nuclear instrumentation system.The present application synchronously executes multiple physical tests, shortens the stable waiting time, greatly shortens the test period, and improves the power generation income.

Description

Technical Field

[0001] This invention relates to the technical field of power generation testing for nuclear power units, and more specifically, to a physical testing method and system for power generation testing of CPR units. Background Technology

[0002] After a CPR unit overhaul, physical tests need to be performed on the 30%FP and 75%FP power platforms, including: test data acquisition system (KIC), flow coefficient calibration of power plant computer system (KDO), power range coefficient calibration of nuclear instrumentation system (RPN), full core energy map measurement, parameter modification of loss-of-coolant accident detection system (LSS), and modification of RPN protection settings.

[0003] The full-core energy map measurement test can only be performed 6 hours after the power platform has stabilized; LSS parameter modification can only be performed after the full-core energy map measurement test is completed; KDO flow coefficient calibration and RPN parameter calibration tests can only be performed 2 hours after the power platform has stabilized; KDO flow coefficient modification and RPN parameter modification tests can only be performed after the calibration tests are completed; and RPN protection setting modification tests can only be performed after all tests are completed. Each test requires 2 hours to execute. Therefore, according to the above physical testing method for increasing power platform, the unit needs to remain at the 30% FP and 75% FP platforms for approximately 12 hours each to complete all tests, which significantly affects the unit's power output and reduces testing efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a physical test method and system for increasing the power output of CPR units.

[0005] The technical solution adopted by this invention to solve its technical problem is: to construct a physical test method for increasing the power output of a CPR unit, including the following steps:

[0006] During the process of increasing the power output of the unit, the power output of the unit is monitored to obtain the real-time power output of the unit;

[0007] Based on the real-time power, determine whether the unit's power has reached the target power;

[0008] If so, wait for the preset time period;

[0009] After the preset time period is reached, the first set of physical experiments will be executed simultaneously;

[0010] When the first set of physical experiments begins, the timing is started to obtain the first monitoring time;

[0011] Determine whether the end time of the first group of physical experiments has been reached based on the first monitoring time;

[0012] If the end time of the first set of physical experiments is reached, the second set of physical experiments will be executed simultaneously.

[0013] When the second set of physical experiments begins, the timing is started to obtain the second monitoring time;

[0014] Determine whether the end time of the second group of physical experiments has been reached based on the second monitoring time;

[0015] If the end time of the second set of physical tests is reached, then the nuclear instrumentation system protection setting modification test will be performed.

[0016] In the physical test method for increasing the power output of CPR units described in this invention, the preset time period is less than 6 hours.

[0017] In the physical test method for increasing the power output of CPR units described in this invention, the preset time period is 2 hours.

[0018] In the physical test method for increasing the power output of CPR units described in this invention, the first set of physical tests includes: power plant computer system flow coefficient calibration test, whole core flux diagram measurement test, and nuclear instrument system power range coefficient calibration test.

[0019] The second group of physical tests includes: power plant computer system flow coefficient modification test, loss-of-water accident detection system parameter modification test, and nuclear instrument system parameter calibration test.

[0020] In the physical test method for increasing the power output of CPR units described in this invention, the nuclear instrumentation system power range coefficient calibration test is conducted using a nuclear instrumentation system calibration method that does not require xenon oscillation throughout its entire lifespan.

[0021] The present invention also provides a physical test system for increasing the power output of a CPR unit, comprising:

[0022] The power monitoring unit is used to monitor the power of the unit during the power increase process to obtain the real-time power of the unit;

[0023] The first judgment unit is used to determine whether the power of the unit has reached the target power based on the real-time power.

[0024] A waiting unit is used to wait for a preset time period when the target power is reached;

[0025] The first execution unit is used to synchronously execute the first set of physical experiments after a preset time period has elapsed;

[0026] The first monitoring unit is used to start timing and obtain the first monitoring time when the first set of physical experiments begins to be carried out.

[0027] The second judgment unit is used to determine whether the end time of the first group of physical experiments has been reached based on the first monitoring time.

[0028] The second execution unit is used to simultaneously execute the second set of physical experiments upon reaching the end time of the first set of physical experiments;

[0029] The second monitoring unit is used to start timing and obtain the second monitoring time when the second set of physical experiments begins.

[0030] The third judgment unit is used to determine whether the end time of the second group of physical experiments has been reached based on the second monitoring time.

[0031] The third execution unit is used to perform a nuclear instrumentation system protection setting modification test when the end time of the second set of physical tests is reached.

[0032] In the CPR unit power-up physical test system described in this invention, the preset time period is less than 6 hours.

[0033] In the CPR unit power-up physical test system described in this invention, the preset time period is 2 hours.

[0034] In the CPR unit power-up physical test system described in this invention, the first set of physical tests includes: power plant computer system flow coefficient calibration test, whole core flux diagram measurement test, and nuclear instrument system power range coefficient calibration test.

[0035] The second group of physical tests includes: power plant computer system flow coefficient modification test, loss-of-water accident detection system parameter modification test, and nuclear instrument system parameter calibration test.

[0036] In the CPR unit power-up physical test system described in this invention, the nuclear instrumentation system power range coefficient calibration test is conducted using a nuclear instrumentation system calibration method that does not require xenon oscillation throughout its entire lifespan.

[0037] The CPR unit power-up physical test method and system of the present invention has the following beneficial effects: It includes the following steps: acquiring the real-time power of the unit; determining whether the unit's power has reached the target power; if so, waiting for a preset time period; after the preset time period has elapsed, simultaneously executing the first set of physical tests; starting a timer when the first set of physical tests begins to obtain a first monitoring time; determining whether the end time of the first set of physical tests has been reached; if the end time of the first set of physical tests has been reached, simultaneously executing the second set of physical tests; starting a timer when the second set of physical tests begins to obtain a second monitoring time; determining whether the end time of the second set of physical tests has been reached based on the second monitoring time; if the end time of the second set of physical tests has been reached, performing a nuclear instrument system protection setting modification test. The present invention significantly shortens the test period and improves power generation revenue by simultaneously executing multiple physical tests and shortening the stabilization waiting time. Attached Figure Description

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0039] Figure 1 This is a flowchart illustrating the physical test method for increasing the power output of a CPR unit according to the present invention;

[0040] Figure 2 This is the core power distribution data of the CPR unit after 2 hours of stabilization;

[0041] Figure 3 This is the core power distribution data of the CPR unit after 6 hours of stabilization;

[0042] Figure 4 This is a detailed flowchart of the various physical tests conducted after the overhaul of the existing CPR unit;

[0043] Figure 5 This is a flowchart illustrating the specific physical tests conducted after the overhaul of the CPR unit according to the present invention.

[0044] Figure 6 This is a logic block diagram of the physical test system for increasing the power output of CPR units according to the present invention. Detailed Implementation

[0045] 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.

[0046] Figure 1 A flowchart of an embodiment of the CPR unit power increase test method provided by the present invention is shown.

[0047] like Figure 1 As shown, the physical test method for increasing the power output of the CPR unit includes the following steps:

[0048] Step S101: During the power increase process of the unit, the power of the unit is monitored to obtain the real-time power of the unit.

[0049] Specifically, in this embodiment, during the power increase process after the CPR unit overhaul, the power of the unit can be monitored in real time through the power plant's existing monitoring system to obtain the real-time power of the unit.

[0050] Step S102: Determine whether the unit's power has reached the target power based on the real-time power.

[0051] In this embodiment, the target power is 30%FP and 75%FP. FP is the rated power of the unit. Specifically, since the CPR unit needs to undergo physical tests at 30%FP and 75%FP power platforms after overhaul, step S103 is executed when the unit's real-time power reaches 30%FP or 75%FP.

[0052] Step S103: If yes, wait for a preset time period.

[0053] Step S104: After the preset time period is reached, the first set of physical experiments is executed synchronously.

[0054] In this embodiment, the preset time period is less than 6 hours. Preferably, the preset time period is 2 hours.

[0055] In this embodiment, the first set of physical tests includes: power plant computer system flow coefficient calibration test, full-core flux diagram measurement test, and nuclear instrumentation system (RPN) power range coefficient calibration test. Specifically, the traditional full-core flux diagram test for power-up platforms requires the unit to stabilize for 6 hours after reaching the target power before flux diagram measurement can be performed. The test prerequisites are as follows: the temperature control rod group R is within ±6 steps of the adjustment band, with a variation of less than 2 steps; the primary loop pressure is 154 ± 1 bar.g (gauge pressure), with a variation of less than 1 bar; the difference between the reactor coolant average temperature and the reference temperature is less than 0.5℃; and the variation in axial power deviation is less than 0.3% FP / h.

[0056] Based on the analysis of actual core state trends, this invention shows that the unit's real-time power can meet the above requirements if it stabilizes for 2 hours after reaching the target power. Specifically, comparing the core power distribution data of the unit after reaching the target power and stabilizing for 2 hours (e.g., ... Figure 2 (as shown) and core power distribution data after 6 hours of stable operation (as shown) Figure 3 As shown), by Figure 2 and Figure 3 It can be seen that the power distribution changes after 2 hours and 6 hours of stabilization are approximately one-thousandth, which is very small. Through comparative analysis, optimizing the start time of the full-core flux map measurement from 6 hours to 2 hours of stabilization can meet the requirements.

[0057] In this embodiment, physical tests can be performed after the unit's real-time power reaches the target power and stabilizes for 2 hours. To further improve testing efficiency, after the power stabilizes for 2 hours, the power plant computer system flow coefficient calibration test, the whole core flux diagram measurement test, and the nuclear instrumentation system power range coefficient calibration test are performed simultaneously.

[0058] Furthermore, in this embodiment, to improve the accuracy of the nuclear power (RPN nuclear power) and axial power deviation display value (ΔI display value) in the flux diagram measurement test, the present invention employs a nuclear instrumentation system power range coefficient calibration test using a nuclear instrumentation system calibration method that does not require xenon oscillation throughout its entire lifespan. Specifically, the nuclear instrumentation system calibration method that does not require xenon oscillation throughout its entire lifespan includes the following steps:

[0059] Step 1. Simulate the process of neutron transport from the reactor core to the external detector, and obtain the detector response factor at each location within the reactor core; Step 2. Simulate and construct the theoretical xenon oscillation process, and obtain the fission neutron production rate at each location within the reactor core during the xenon oscillation process; Step 3. Based on the detector response factor and fission neutron production rate, obtain the response current distribution of each external detector during the xenon oscillation process; Step 4. Calculate the calibration coefficient using the current distribution. In Step 1, the process of neutron transport from the reactor core to the external detector is simulated using a Monte Carlo program. The response of the neutron at location (x, y, z) within the reactor core to detector i is: R i (x, y, z) = W i (x, y, z)νΣ f Φ(x, y, z); where W i (x, y, z) represents the response factor at position (x, y, z) on detector i, Φ(x, y, z) represents the neutron fluence at position (x, y, z), and Σ f ν is the fission cross section, and ν is the average number of neutrons produced in each fission.

[0060] Specifically, in traditional power-up platform physical tests, nuclear power calibration is performed two hours after the unit reaches the target power and stabilizes. This involves adjusting the RPN system's K parameter to eliminate nuclear thermal power deviation, thereby ensuring the accuracy of the RPN nuclear power and ΔI displayed values. However, this method only eliminates nuclear thermal deviation and cannot recalibrate the RPN power range calibration coefficient. This invention employs a full-lifetime nuclear instrumentation system calibration method that does not require xenon oscillation. Combined with flux diagram measurement results, it can recalibrate the RPN power range coefficient at 30% FP and 75% FP power platforms, thus ensuring the accuracy of the RPN nuclear power and ΔI displayed values. By analyzing historical power-up physical test data, the RPN power range calibration coefficient calculated using the full-lifetime nuclear instrumentation system calibration method without xenon oscillation can effectively eliminate the deviation between the RPN power range nuclear power and ΔI displayed values. Table 1 shows a comparison of the RPN power range coefficients and deviations obtained using the traditional method and this method.

[0061]

[0062]

[0063] As can be seen from Table 1, the nuclear instrument system calibration method without xenon oscillation throughout the entire lifespan adopted in this invention not only eliminates the nuclear power deviation but also the ΔI deviation compared to traditional methods. Therefore, it can better improve the accuracy of the RPN nuclear power and ΔI display values.

[0064] Step S105: When the first group of physical experiments begins, start the timing to obtain the first monitoring time.

[0065] In this embodiment, the first monitoring time can be 2 hours. It should be noted that the first monitoring time is the test time of the first group of physical experiments. That is to say, the first monitoring time is not limited to 2 hours. It needs to be determined according to the actual test situation. For example, if the first group of physical experiments is completed in 1 hour or 1.5 hours, then the first monitoring time is 1 hour or 1.5 hours.

[0066] Step S106: Determine whether the end time of the first group of physical experiments has been reached based on the first monitoring time.

[0067] In this embodiment, the end time of the first group of physical experiments is the end time point of the first group of physical experiments. The end time point of the first group of physical experiments is determined based on the actual experimental conditions. That is, it is monitored in real time during the execution of the first group of physical experiments. If the experimental time of the first group of physical experiments requires 1 hour, 1.5 hours, or 2 hours, then when the time point of 1 hour, 1.5 hours, or 2 hours is reached, it is determined that the first group of physical experiments has been completed.

[0068] Step S107: If the end time of the first group of physical experiments is reached, the second group of physical experiments will be executed simultaneously.

[0069] In this embodiment, the second set of physical tests includes: a power plant computer system flow coefficient modification test, a loss-of-coolant (LSS) accident detection system parameter modification test, and a nuclear instrumentation system (RPN) parameter calibration test. By performing these tests simultaneously, the test time can be further shortened and the test efficiency improved.

[0070] Step S108: When the second group of physical experiments begins, start the timing to obtain the second monitoring time.

[0071] In this embodiment, the second monitoring time can be 2 hours. It should be noted that this second monitoring time refers to the testing time of the second group of physical experiments. That is, the second monitoring time is not limited to 2 hours; it needs to be determined based on the actual testing conditions. For example, if the second group of physical experiments is completed in 1 hour or 1.5 hours, then the second monitoring time is 1 hour or 1.5 hours. Step S109: Determine whether the end time of the second group of physical experiments has been reached based on the second monitoring time.

[0072] In this embodiment, the end time of the second group of physical experiments is the end point of the second group of physical experiments. The end point of the second group of physical experiments is determined based on the actual experimental conditions. That is, it is monitored in real time during the execution of the second group of physical experiments. If the experimental time of the second group of physical experiments requires 1 hour, 1.5 hours, or 2 hours, then when the time point of 1 hour, 1.5 hours, or 2 hours is reached, it is determined that the second group of physical experiments has been completed.

[0073] Step S110: If the end time of the second group of physical tests is reached, then perform the nuclear instrumentation system (RPN) protection setting modification test.

[0074] Specifically, such as Figure 4 As shown, in the existing physical testing process, after the unit's real-time power reaches the target power, it is necessary to wait 6 hours before performing the full-core flux diagram measurement, then modifying the LSS parameters, and finally performing the RPN protection setting modification test. Figure 4 It can be seen that the traditional experimental procedure takes a total of 12 hours. However, by using the method of this invention, as... Figure 5 As shown, once the unit's real-time power reaches the target power, a full-core flux diagram measurement can be performed after only 2 hours, and multiple physical tests can be executed simultaneously, effectively shortening the testing time. Figure 5It can be seen that the total test time of this method is 8 hours, which can be effectively shortened by 4 hours. The significantly shortened test time greatly improves the test efficiency.

[0075] Compared with traditional testing methods, this invention can significantly shorten the testing period, thereby reducing the time the unit spends on low-power platforms. Each power platform can save 4 hours of critical path time, greatly improving the unit's power generation revenue.

[0076] This invention also provides a physical testing system for increasing the power output of a CPR unit. Specifically, as shown in... Figure 6 As shown, the CPR unit power-up physical test system includes:

[0077] The power monitoring unit 601 is used to monitor the power of the unit during the power increase process to obtain the real-time power of the unit.

[0078] The first judgment unit 602 is used to determine whether the power of the unit has reached the target power based on the real-time power.

[0079] The waiting unit 603 is used to wait for a preset time period when the target power is reached.

[0080] The first execution unit 604 is used to synchronously execute the first set of physical experiments after a preset time period has elapsed.

[0081] In this embodiment, the preset time period is less than 6 hours, preferably 2 hours.

[0082] The first set of physical tests includes: power plant computer system flow coefficient calibration test, full-core flux diagram measurement test, and nuclear instrumentation system power range coefficient calibration test. In this embodiment, the nuclear instrumentation system power range coefficient calibration test adopts a nuclear instrumentation system calibration method that does not require xenon oscillation throughout its entire lifespan.

[0083] The first monitoring unit 605 is used to start timing and obtain the first monitoring time when the first group of physical experiments begins.

[0084] The second judgment unit 606 is used to determine whether the end time of the first group of physical experiments has been reached based on the first monitoring time.

[0085] The second execution unit 607 is used to simultaneously execute the second set of physical experiments when the end time of the first set of physical experiments is reached.

[0086] The second group of physical tests includes: power plant computer system flow coefficient modification test, loss-of-water accident detection system parameter modification test, and nuclear instrument system parameter calibration test.

[0087] The second monitoring unit 608 is used to start timing and obtain the second monitoring time when the second set of physical experiments begins.

[0088] The third judgment unit 609 is used to determine whether the end time of the second group of physical experiments has been reached based on the second monitoring time.

[0089] The third execution unit 610 is used to perform a nuclear instrument system protection setting modification test when the end time of the second group of physical tests is reached.

[0090] Specifically, the specific coordination and operation process between the various units in the CPR unit power-up physical test system can be referred to the above-mentioned CPR unit power-up physical test method, and will not be repeated here.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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 physical test method for increasing the power output of a CPR unit, characterized in that, Includes the following steps: During the process of increasing the power output of the unit, the power output of the unit is monitored to obtain the real-time power output of the unit; Based on the real-time power, determine whether the unit's power has reached the target power; If so, wait for a preset time period; the preset time period is 2 hours. After the preset time period is reached, the first set of physical experiments will be executed simultaneously; The first set of physical tests includes: power plant computer system flow coefficient calibration test, full core flux diagram measurement test, and nuclear instrument system power range coefficient calibration test; the nuclear instrument system power range coefficient calibration test adopts a nuclear instrument system calibration method that does not require xenon oscillation throughout its entire lifespan. When the first set of physical experiments begins, the timing is started to obtain the first monitoring time; Determine whether the end time of the first group of physical experiments has been reached based on the first monitoring time; If the end time of the first group of physical tests is reached, the second group of physical tests will be executed simultaneously. The second group of physical tests includes: power plant computer system flow coefficient modification test, loss-of-water accident detection system parameter modification test, and nuclear instrument system parameter calibration test. When the second set of physical experiments begins, the timing is started to obtain the second monitoring time; Determine whether the end time of the second group of physical experiments has been reached based on the second monitoring time; If the end time of the second set of physical tests is reached, then the nuclear instrumentation system protection setting modification test will be performed.

2. A physical test system for increasing the power output of a CPR unit, characterized in that, include: The power monitoring unit is used to monitor the power of the unit during the power increase process to obtain the real-time power of the unit; The first judgment unit is used to determine whether the power of the unit has reached the target power based on the real-time power. A waiting unit is used to wait for a preset time period when the target power is reached; the preset time period is 2 hours. The first execution unit is used to synchronously execute the first set of physical experiments after a preset time period has elapsed; The first set of physical tests includes: power plant computer system flow coefficient calibration test, full core flux diagram measurement test, and nuclear instrument system power range coefficient calibration test; the nuclear instrument system power range coefficient calibration test adopts a nuclear instrument system calibration method that does not require xenon oscillation throughout its entire lifespan. The first monitoring unit is used to start timing and obtain the first monitoring time when the first set of physical experiments begins to be carried out. The second judgment unit is used to determine whether the end time of the first group of physical experiments has been reached based on the first monitoring time. The second execution unit is used to simultaneously execute the second set of physical tests upon reaching the end time of the first set of physical tests; the second set of physical tests includes: power plant computer system flow coefficient modification test, loss-of-water accident detection system parameter modification test, and nuclear instrument system parameter calibration test; The second monitoring unit is used to start timing and obtain the second monitoring time when the second set of physical experiments begins. The third judgment unit is used to determine whether the end time of the second group of physical experiments has been reached based on the second monitoring time. The third execution unit is used to perform a nuclear instrumentation system protection setting modification test when the end time of the second set of physical tests is reached.

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