Out-of-core detector calibration method and apparatus, and device, storage medium and program product

Abstract

An out-of-core detector calibration method, comprising: acquiring initial detection power data obtained by means of an out-of-core detector performing out-of-core detection on a target nuclear reactor, and acquiring detection power calibration parameters corresponding to the initial detection power data (S101); and using the detection power calibration parameters to perform calibration processing on the initial detection power data, so as to obtain corrected target detection power data (S102), wherein the detection power calibration parameters are calculated by means of working conditions of different water temperatures among a plurality of power working conditions in a constructed nuclear reactor, and the working conditions of different water temperatures are used for simulating the influence of different in-core water temperature distributions on the detection power data detected by means of the out-of-core detector.

Description

Method, device, equipment, storage medium and program product for calibrating off-pile detectors

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 26, 2023, with application number 202311251149.2, and entitled “Ex-pile detector calibration method, device, equipment, storage medium and program product”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of off-pile detection technology, and in particular to an off-pile detector calibration method, device, equipment, storage medium and program product. Background Art

[0003] Ex-core detection technology plays an important role in the operation control, core protection and data monitoring of nuclear reactors. During the operation phase of a general nuclear reactor, the inside of the core is in a high-temperature, high-pressure and high-radioactive environment. It is necessary to use ex-core detectors located outside the nuclear reactor to detect the actual operating power of the entire core, axial power offset and other detection power data.

[0004] Under different operating conditions, the number of neutrons detected by the ex-core detectors will vary, affecting the power data they produce. Therefore, regular calibration of these data is necessary to ensure their accuracy and authenticity. In related technologies, this calibration typically focuses on the impact of the deviation between the nuclear power and thermal power of the reactor during power variations within the reactor.

[0005] However, the above-mentioned method for calibrating the ex-pile detector cannot take into account all factors affecting the power data measured by the ex-pile detector, and there is still the problem of low accuracy of the detection power data of the calibrated detector.

[0006] Summary of the Invention

[0007] According to various embodiments of the present application, a method, apparatus, device, storage medium, and program product for calibrating an off-core detector are provided. The method includes:

[0008] Acquiring initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and acquiring detection power calibration parameters corresponding to the initial detection power data;

[0009] Calibrate the initial detection power data using the detection power calibration parameters to obtain target detection power data after target correction;

[0010] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power working conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the out-of-core detector.

[0011] A water temperature-based out-of-pile detector calibration device. The device comprises:

[0012] an acquisition module, configured to acquire initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and to acquire detection power calibration parameters corresponding to the initial detection power data;

[0013] a processing module, configured to calibrate the initial detection power data using the detection power calibration parameters to obtain target detection power data;

[0014] The detection power calibration parameters are calculated based on the operating conditions of different water temperatures in the constructed nuclear reactor. The operating conditions of different water temperatures are used to simulate the impact of different in-core water temperature distributions on the detection power data detected by the external detector.

[0015] A computer device. The computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0016] Acquiring initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and acquiring detection power calibration parameters corresponding to the initial detection power data;

[0017] Calibrate the initial detection power data using the detection power calibration parameters to obtain target detection power data after target correction;

[0018] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power working conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the out-of-core detector.

[0019] A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the following steps:

[0020] Acquiring initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and acquiring detection power calibration parameters corresponding to the initial detection power data;

[0021] Calibrate the initial detection power data using the detection power calibration parameters to obtain target detection power data after target correction;

[0022] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power working conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the out-of-core detector.

[0023] A computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the computer program implements the following steps:

[0024] Acquiring initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and acquiring detection power calibration parameters corresponding to the initial detection power data;

[0025] Calibrate the initial detection power data using the detection power calibration parameters to obtain target detection power data after target correction;

[0026] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power working conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the out-of-core detector.

[0027] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] FIG1 is a schematic flow chart of an off-pillar detector calibration method according to one embodiment;

[0030] FIG2 is a schematic diagram of a process for a computer device to obtain detection power calibration parameters corresponding to initial detection power data in another embodiment;

[0031] FIG3 is a cross-sectional view of a nuclear reactor according to one embodiment;

[0032] FIG4 is a schematic diagram of a flow chart of step 202 in another embodiment;

[0033] FIG5 is a schematic flow chart of an off-pile detector calibration method according to another embodiment;

[0034] FIG6 is a schematic diagram of a flow chart of step 102 in another embodiment;

[0035] FIG7 is a structural block diagram of an off-pile detector calibration device according to one embodiment;

[0036] FIG8 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0038] Ex-core detection technology plays a vital role in monitoring nuclear reactor operations. During typical nuclear reactor operation, the core is exposed to high temperatures, pressures, and radioactivity. Ex-core detectors located outside the reactor are required to detect power data, such as the true operating power of the core as a whole and axial power offset. Power plants monitor, protect, and control nuclear reactors based on the power data (also known as indicator values) detected by these detectors.

[0039] During the actual power operation of a nuclear power plant, different power operating conditions will occur depending on the different grid loads. Changes in operating conditions will cause changes in the number of core neutrons detected by the ex-core detectors, thereby affecting the detection power data of the ex-core detectors. Therefore, it is necessary to regularly calibrate the detection power data of the ex-core detectors to ensure the accuracy and authenticity of the detection power data of the ex-core detectors.

[0040] The factors that actually cause the deviation of the detection power data of the ex-core detector are also related to the neutron absorption and shielding in the nuclear reactor. After the material and thickness of the core reflective layer are fixed, the shielding coefficient remains basically unchanged, while the absorption of neutrons by the moderator in the nuclear reactor is a key influencing factor. Usually, most commercial nuclear reactors are pressurized water reactors, and the moderator is water. Changes in water temperature lead to changes in water density, which will have a significant impact on the absorption of neutrons in the pile. Correspondingly, the number of neutrons detected by the ex-core detector will also change, causing the detection power data of the ex-core detector to deviate. It can be seen that the impact of changes in water temperature in the nuclear reactor on the detection power data of the ex-core detector cannot be ignored.

[0041] In related technologies, when calibrating the detection power data detected by the off-core detector, usually only the impact of the deviation between the internal and external nuclear power and thermal power of the nuclear reactor on the detector detection power data during the power change inside the nuclear reactor is considered. Therefore, the off-core detector calibration method in traditional technology still has the problem of low accuracy of the detection power data of the calibrated detector.

[0042] In view of this, an embodiment of the present application provides an ex-core detector calibration method, which obtains initial detection power data obtained by an ex-core detector for ex-core detection of a target nuclear reactor, and obtains detection power calibration parameters corresponding to the initial detection power data, and uses the detection power calibration parameters to calibrate the initial detection power data to obtain target detection power data, wherein the detection power calibration parameters are calculated through working conditions with different water temperatures in a constructed nuclear reactor, and working conditions with different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the ex-core detector. In this way, working conditions with different water temperatures in a nuclear reactor are constructed. When calibrating the detection power data of the ex-core detector, the influence of different in-core water temperature distributions on the detection power data detected by the ex-core detector is taken into account in the calculation of the detection power calibration parameters, so that the calculated detection power calibration parameters are more accurate. Therefore, calibrating the detection power data of the ex-core detector based on the detection power calibration parameters can improve the accuracy of the detection power data of the ex-core detector.

[0043] The off-pillar detector calibration method provided in the embodiment of the present application can be used for a computer device, which can be a server. The server can be a single server or a server cluster composed of multiple servers.

[0044] In one embodiment, as shown in FIG1 , a method for calibrating an off-pillar detector is provided. The method is described using a computer device as an example. The method includes the following steps:

[0045] Step 101: obtaining initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and obtaining detection power calibration parameters corresponding to the initial detection power data.

[0046] In an embodiment of the present application, the off-core detector is a detector or instrument arranged outside the nuclear reactor for monitoring and measuring the activities of the nuclear reactor. The off-core detector is used to detect neutron signals from the nuclear reactor, that is, it can detect important operating parameters such as the actual operating power of the entire core in the nuclear reactor, the axial power offset AO (Axial Offset), and obtain initial detection power data, and the computer equipment obtains the initial detection power data.

[0047] Optionally, the computer device may monitor the readings of the external detector to obtain initial detection power data.

[0048] Next, the computer device can obtain the detection power calibration parameters corresponding to the initial detection power data. The detection power calibration parameters can be used to calibrate and correct the initial detection power data of the ex-core detector.

[0049] Exemplarily, if the target nuclear reactor is currently operating under full-power conditions, the detection power calibration parameter is the detection power calibration coefficient corresponding to the full-power conditions; if the target nuclear reactor is currently operating under non-full-power conditions, the detection power calibration parameter may include the detection power calibration coefficient corresponding to the full-power conditions and the power indication deviation value, which can characterize the degree of deviation of the detection power data of the off-core detector compared with the full-power conditions.

[0050] If the system is currently operating at a lower power level, directly calibrating the initial detection power data using the calibration coefficient corresponding to the full power level will result in inaccurate calibration results. Therefore, it is necessary to obtain a power indication deviation value and perform further calibration based on this power indication deviation value.

[0051] Step 102: calibrate the initial detection power data using the detection power calibration parameters to obtain calibrated target detection power data.

[0052] Exemplarily, the computer device may multiply the detection power calibration parameter with the initial detection power data, and use the multiplication result to perform mathematical operations on the initial detection power data to obtain target detection power data, thereby achieving calibration of the initial detection power data.

[0053] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the impact of different in-core water temperature distributions on the detection power data of the external detector.

[0054] In the embodiment of the present application, the operating conditions of different water temperatures are obtained by adjusting the water temperatures at different positions in the nuclear reactor based on the baseline control operating conditions. The different positions include the downflow section position in the nuclear reactor and the water section position between the enclosure and the hanging basket in the nuclear reactor.

[0055] For example, the core of a nuclear reactor is usually cylindrical, as shown in Figure 3, which is a 1 / 4 cross-sectional view of a nuclear reactor. The core of the nuclear reactor contains multiple groups of core components (such as the small squares in Figure 3), where the part surrounding the component is called a panel, that is, the straight part surrounding the small squares in Figure 3. The outer part of the panel is called a hanging basket, and the hanging basket is cylindrical as a whole, and all components can be fixed in a hanging basket.

[0056] In conventional pressurized water reactors (PWRs), the reactor core is submerged in moderator water during operation, meaning the space between the coaming and the basket is used to hold water. A gap exists between the outer edge of the basket and the inner edge of the reactor's outermost pressure vessel (as shown in Figure 3, the reactor pressure vessel is located outside the basket). This gap also serves to hold water. Water flows into the reactor from the higher portion of the reactor's outer cylinder and then flows upward from the bottom of the core. The area where water flows in from the higher portion of the coaming is the descending section.

[0057] In view of this, when constructing working conditions with different water temperatures, the embodiment of the present application can consider adjusting the water temperature in the above-mentioned descending section area, and can also adjust the water temperature in the gap between the enclosure and the hanging basket.

[0058] For example, as shown in Table 1 below, three operating conditions with different water temperatures in the nuclear reactor are constructed respectively. The first operating condition is the baseline operating condition of hot full power (HFP); the second operating condition is the operating condition of modifying the water temperature in the descending section according to the radial distribution of water temperature under hot full power; the third operating condition is the operating condition of modifying the axial distribution of water temperature in the coaming and the hanging basket according to the radial distribution of water temperature under hot full power.

[0059] Table 1 Description of different water temperature conditions

[0060] Through the above method, different water temperature working conditions are established, and when obtaining the detection power calibration parameters, the working conditions of different water temperatures in the constructed nuclear reactor can be calculated. The inventors of this application found through a large number of experiments during the research and development process that based on the above-mentioned different water temperature working conditions, by quantitatively calculating and analyzing the influence of water temperature on the initial detection power data, as in the working conditions shown in Table 1, it can be obtained through calculation and analysis that the influence of working condition 2 on the initial detection power data is about 2%, and the influence of working condition 3 on the initial detection power data is about 4%. Therefore, according to the specific water temperature changes and the initial detection power data, the off-core detector can be calibrated more accurately, thereby more accurately monitoring, protecting and controlling the nuclear reactor.

[0061] Based on the embodiment shown in FIG1 , referring to FIG2 , this embodiment relates to a process for a computer device to obtain detection power calibration parameters corresponding to initial detection power data. In this embodiment, the detection power calibration parameters include a detection power calibration coefficient corresponding to a full-power operating condition. The process for the computer device to obtain the detection power calibration parameters corresponding to the initial detection power data may include steps 201 and 202 shown in FIG2 :

[0062] Step 201 : Calculate detector response factors corresponding to the multiple power operating conditions by using the operating conditions of different water temperatures in the constructed multiple power operating conditions and a preset probability algorithm.

[0063] Among them, multiple power operating conditions include full-power operating conditions and low-power operating conditions. Among them, the full-power operating condition refers to the operation of the nuclear reactor at the highest power. Under the full-power operating condition, the nuclear reactor can reach the maximum power level under normal operating conditions; the low-power operating condition refers to the operation of the nuclear reactor at a lower power. The low-power operating condition can be the operating condition of the nuclear reactor power at 80% and the operating condition of the nuclear reactor power at 50%.

[0064] In an embodiment of the present application, the preset probability algorithm can be a Monte Carlo algorithm, which calculates the detector response factors corresponding to multiple power conditions by simulating the process of neutron transmission from the core to the external detector in the nuclear reactor. It can be understood that the detector response factor is calculated by simulating the neutron transmission process inside the nuclear reactor to calculate the response of the external detector to the neutron signal under different power conditions. The detector response factor can be expressed in the form of a function.

[0065] Please continue to refer to FIG3 . Ten core components are selected according to 1 / 8 of the core symmetry in the nuclear reactor, and the response factors of each component to the external detector under multiple power conditions are calculated.

[0066] For example, in the calculation process of the Monte Carlo algorithm, first, the input parameters of the nuclear reactor under different power conditions are determined. The input parameters may include water temperature (the three different water temperatures constructed above), pressure, and material properties, etc. Then, a random number generator is constructed to generate random numbers that conform to a specific probability distribution. Then, through cyclic iterative calculations, the random number generator is used to generate random parameters in each iteration, and the random parameters are applied to the response function model of the ex-core detector to calculate the response factors of each component to the ex-core detector under multiple power conditions. The calculation formula is as follows:

[0067] Where i refers to the serial number of the detector in the axial direction, and the value range of i is 1 to 6, representing 6 different axial segments; W i (r) refers to the contribution of the fission neutron at position r in the core of a nuclear reactor to the response of the i-th section of the external detector.

[0068] In this way, through the above method, the computer device can calculate the detector response factors corresponding to the full-power working condition and the low-power working condition respectively.

[0069] In the above manner, the computer equipment selects some of the peripheral components of the nuclear reactor to calculate the response factors according to the symmetry of the core in the nuclear reactor. In this way, the calculation status of the entire nuclear reactor can be reflected by the calculation status of some components according to the symmetry of the core, which can effectively reduce the amount of calculation and the complexity of analysis, while providing more accurate calculation data.

[0070] Step 202 : Calculate a detection power calibration coefficient based on a first detector response factor corresponding to a full power operating condition among a plurality of power operating conditions.

[0071] As described above, the detector response factors of each component to the ex-core detector under multiple power conditions are obtained through a preset probability algorithm. In a nuclear reactor, the full-power condition refers to the operation of the nuclear reactor at the highest power. Under the full-power condition, the nuclear reactor can reach the maximum power level under normal operating conditions. Under this full-power condition, the response of the ex-core detector to the core neutron signal in the nuclear reaction is the first detector response factor.

[0072] The detection power calibration coefficient is a parameter used to calibrate the detection power data of the detector, and corrects the actual initial detection power data into more accurate power data.

[0073] Based on the embodiment shown in FIG2 , referring to FIG4 , step 202 may include steps 401 and 402 shown in FIG4 :

[0074] Step 401 : Calculate a first theoretical current value of an ex-core detector under full power conditions according to a first detector response factor.

[0075] In the embodiment of the present application, the computer device can calculate the first theoretical current signal response R of the off-core detector under full power conditions. i , the calculation formula is as follows: R i =∫ V P i (r)W i (r)dr Formula 2

[0076] Among them, W i (r) is the first detector response function (first detector response factor), which represents the contribution of fission neutrons at position r in the core of the nuclear reactor to the response of the i-th section of the external detector; V is the total volume of the core; P i (r) is the power at point r in the core of the nuclear reactor.

[0077] Since the ex-core detector current signal response R is proportional to the ex-core detector current signal I, the ex-core detector current signal response R can be used as the simulated value of the ex-core detector current signal I, that is, the optimal estimated value of the measured value of the ex-core detector current signal. In this way, the first detector response factor R of the ex-core detector under full power conditions can be used to calculate the value of the ex-core detector current signal I. i Get the first theoretical current value I of the corresponding off-core detector i .

[0078] Then, the first theoretical current value of the upper i, which is the 1st to 3rd segment of the external detector, is merged into the upper first theoretical current value I UThe lower i is the first theoretical current value of the 4th to 6th segment out-of-core detectors merged into the lower first theoretical current value I L .

[0079] Step 402: Substitute the first theoretical current value into a preset set of equations to solve them and obtain detection power calibration parameters.

[0080] In the embodiment of the present application, according to the first theoretical current value I of the upper electric current under the full power working condition, U and the lower first theoretical current value I L , the out-of-core axial power offset AO is obtained by the following calculation formula 3: ex .

[0081] For example, the full core flux diagram can be used to obtain the axial power offset AO in a nuclear reactor. in The full core flux diagram is used to show the number of neutrons (a type of particle) at different locations inside a nuclear reactor. ex and the axial power offset AO within the stack in The linear relationship between them is obtained by least square fitting, as shown in Formula 4 below, to obtain the fitting coefficients a and b. ex =a+b·AO in Formula 4

[0082] According to the preset equations, as shown in formulas 5 to 7, the detection power calibration parameters of the out-of-core detector are calculated, that is, the calibration coefficients α and K under full power conditions. U and K L , where α is the detector calibration coefficient; K U and K L are the upper and lower calibration coefficients respectively;

[0083] In this way, the computer device calculates the detection power calibration coefficient based on the first detector response factor.

[0084] In the above manner, the computer equipment can calculate the detection power calibration coefficient based on the first detector response factor corresponding to the full-power operating condition. In this way, the detection power calibration coefficient can assist in the design and optimization of nuclear reactors and obtain accurate detection power data of the off-core detector.

[0085] In one embodiment, based on the embodiment shown in Figure 2, see Figure 5. In this embodiment, when the current operating condition of the extra-core detector is a non-full power condition, the detection power calibration parameter also includes a power indication deviation value between the non-full power condition and the full power condition. This embodiment involves a process in which a computer device obtains the detection power calibration parameter.

[0086] As shown in FIG5 , the method for calibrating an out-of-core detector in this embodiment further includes steps 501 and 502 shown in FIG5 :

[0087] Step 501 : Calculate a second theoretical current value of an ex-core detector under a non-full power condition according to a second detector response factor corresponding to a non-full power condition among a plurality of power conditions.

[0088] In the embodiment of the present application, the non-full power operating condition is a low power operating condition of the nuclear reactor, which can be an operating condition where the nuclear reactor power is 80% or an operating condition where the nuclear reactor power is 50%. Under the non-full power operating condition, the above-mentioned preset probability algorithm (Monte Carlo algorithm) is used to calculate and obtain the second detector response factor under each non-full power operating condition, and the second detector response factor (second detector response function) is recorded as W i1 (r).

[0089] For example, according to the second detector response factor W obtained above, i1 (r), calculate the second theoretical current signal response R of the off-core detector under non-full power conditions i1 , the calculation formula is as shown in Formula 8: R i1 =∫ V P i1 (r)W i1 (r)dr Formula 8

[0090] As mentioned above, the current signal response R of the external detector is proportional to the current signal I of the external detector. Therefore, the current signal response R of the external detector can be i1 Used as the current signal I of the external detector i1 In this way, the second theoretical current value I of the off-core detector under non-full power conditions is obtained. i1 .

[0091] Step 502: Calculate the power indication deviation value according to the second theoretical current value and the detection power calibration parameter.

[0092] In the embodiment of the present application, according to the second theoretical current value I i1 , you can get the corresponding upper electric second theoretical current value I U1 and the lower second theoretical current value I L1 , calculate the corresponding power indication deviation value through the following formula 9 and formula 10, where Pr (r) is the indicated power of the core; ΔI(K) is the indicated axial power deviation of the core. r (r) = K U (K)I U1 +K L (K)I L1 Formula 9 ΔI(K)=α(K)[K U (K)I U1 -K L (K)I L1 ] Formula 10

[0093] In this way, the computer equipment can calculate the second theoretical current value of the off-core detector under non-full power conditions based on the above-mentioned second detector response factor, and then calculate the power indication deviation value based on the second theoretical current value and the detection power calibration parameters, which helps to calibrate the off-core detector and improve its accuracy and reliability.

[0094] Based on the embodiment shown in FIG5 , referring to FIG6 , this embodiment relates to a process in which a computer device uses detection power calibration parameters to calibrate initial detection power data to obtain calibrated target detection power data. As shown in FIG6 , step 102 includes steps 1021 and 1022 shown in FIG6 :

[0095] Step 1021: multiply the detection power calibration coefficient by the initial detection power data to obtain intermediate detection power data.

[0096] In an embodiment of the present application, the computer device can multiply the above-mentioned detection power calibration coefficient with the initial detection power data under non-full power conditions. Since the detection power calibration coefficient used is obtained based on the full-power condition, the intermediate detection power data obtained by multiplying the detection power calibration coefficient with the initial detection power data under non-full power conditions is a specific deviation value. Therefore, the intermediate detection power data needs to be further corrected.

[0097] Step 1022: Correct the intermediate detection power data using the power indication deviation value to obtain target detection power data.

[0098] The intermediate detection power data is the detection power data obtained after being processed by the detection power calibration coefficient; the target detection power data is the final detection power data obtained after further calibration of the intermediate detection power data.

[0099] Exemplarily, the power indication deviation value obtained under non-full power conditions and the intermediate detection power data obtained above are subjected to corresponding mathematical operations to obtain the target detection power data after correction. It can be understood that the target detection power data is the intermediate detection power data obtained after calculation of the detection power calibration coefficient, and then the more accurate detection power data is obtained after further correction processing.

[0100] Through the above method, the computer equipment uses the detection power calibration coefficient obtained under the full-power condition to calculate the response factors of the full-power condition (100% power) and the low-power condition (80% power, 50% power), respectively, to calculate the intermediate detection power data under each condition, and then use the power indication deviation value to correct the intermediate detection power data to obtain the final calibrated target detection power data. The off-core detector calibration method can replace the previous method of calibrating the detection power data of the off-core detector by the on-site flux diagram test method used by nuclear power plants. The detection power data of the off-core detector can be calibrated directly in real time through theoretical calculation. Moreover, through the off-core detector calibration method, the off-core detector can accurately measure and monitor the power changes of the nuclear reactor in the transient state (referring to the instantaneous change of the reactor power under non-steady-state conditions, that is, the rapid change process of the nuclear reactor power) and the rapid power increase and decrease stages of the nuclear reactor.

[0101] In one embodiment, a method for calibrating an off-pillar detector is provided for use in a computer device. The method comprises the following steps:

[0102] In step A1, a computer device obtains initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and obtains detection power calibration parameters corresponding to the initial detection power data.

[0103] The detection power calibration parameters include the detection power calibration coefficient corresponding to the full power working condition. The acquisition process of the detection power calibration parameters includes:

[0104] In step a, the computer device calculates the detector response factors corresponding to the multiple power operating conditions by using the operating conditions of different water temperatures in the multiple power operating conditions constructed and a preset probability algorithm.

[0105] The operating conditions of different water temperatures are obtained by adjusting the water temperatures at different positions in the nuclear reactor based on the baseline control operating conditions. The different positions include the downflow section position in the nuclear reactor and the water section position between the coaming and the hanging basket in the nuclear reactor.

[0106] Step b: The computer device calculates a first theoretical current value of the ex-core detector under full power conditions based on the first detector response factor.

[0107] In step c, the computer device substitutes the first theoretical current value into a preset set of equations to solve the equations and obtain the detection power calibration parameters.

[0108] Wherein, when the current working condition of the ex-core detector is a non-full power working condition, the detection power calibration parameter also includes a power indication deviation value between the non-full power working condition and the full power working condition. The acquisition process of the detection power calibration parameter also includes:

[0109] In step a1, the computer device calculates a second theoretical current value of the ex-core detector under the non-full power condition according to a second detector response factor corresponding to the non-full power condition among multiple power conditions.

[0110] In step b1, the computer device calculates the power indication deviation value according to the second theoretical current value and the detection power calibration parameter.

[0111] In step A2, the computer device calibrates the initial detection power data using the detection power calibration parameters to obtain calibrated target detection power data.

[0112] Among them, the detection power calibration parameters are calculated through the operating conditions of different water temperatures in the constructed nuclear reactor. The operating conditions of different water temperatures are used to simulate the impact of different in-core water temperature distributions on the detection power data detected by the external detector.

[0113] Taking the non-full power working condition as an example, step A2 includes:

[0114] Step a2: The computer device multiplies the detection power calibration coefficient by the initial detection power data to obtain intermediate detection power data;

[0115] In step b2, the computer device uses the power indication deviation value to correct the intermediate detection power data to obtain target detection power data.

[0116] Through the above method, the embodiment of the present application constructs working conditions of different water temperatures in a nuclear reactor. When calibrating the detection power data of the ex-core detector, the calculation of the detection power calibration parameters takes into account the influence of different in-core water temperature distributions on the detection power data detected by the ex-core detector, so that the calculated detection power calibration parameters are more accurate. Therefore, calibrating the detection power data of the ex-core detector based on the detection power calibration parameters can improve the accuracy of the detection power data of the ex-core detector.

[0117] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0118] Based on the same inventive concept, an embodiment of the present application further provides an off-core detector calibration device for implementing the above-mentioned off-core detector calibration method. The solution provided by this device is similar to the solution described in the above-mentioned method. Therefore, the specific limitations of the embodiments of the off-core detector calibration device provided below can be found in the above-mentioned limitations of the off-core detector calibration method and will not be repeated here.

[0119] In one embodiment, as shown in FIG7 , an off-pile detector calibration device is provided, comprising:

[0120] An acquisition module 701 is configured to acquire initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and to acquire detection power calibration parameters corresponding to the initial detection power data;

[0121] A processing module 702 is configured to calibrate the initial detection power data using the detection power calibration parameters to obtain calibrated target detection power data;

[0122] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power working conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the out-of-core detector.

[0123] In one embodiment, the acquisition module includes:

[0124] A first calculation unit is configured to calculate detector response factors corresponding to the plurality of power operating conditions by using the operating conditions of different water temperatures among the plurality of constructed power operating conditions and a preset probability algorithm;

[0125] The second calculation unit is used to calculate the detection power calibration coefficient according to the first detector response factor corresponding to the full power working condition among the multiple power working conditions.

[0126] In one embodiment, the second calculation unit is specifically used to calculate the first theoretical current value of the off-core detector under the full-power operating condition based on the first detector response factor, and substitute the first theoretical current value into a preset set of equations for solution to obtain the detection power calibration parameter.

[0127] In one embodiment, the apparatus further comprises:

[0128] A first calculation module is configured to calculate a second theoretical current value of the ex-core detector under the non-full power condition according to a second detector response factor corresponding to the non-full power condition among the multiple power conditions;

[0129] The second calculation module is used to calculate the power indication deviation value according to the second theoretical current value and the detection power calibration parameter.

[0130] In one embodiment, the processing module 702 includes:

[0131] a second calculation unit, configured to multiply the detection power calibration coefficient by the initial detection power data to obtain intermediate detection power data;

[0132] The correction module is used to correct the intermediate detection power data using the power indication deviation value to obtain the target detection power data.

[0133] Among them, the operating conditions of different water temperatures are obtained by adjusting the water temperatures at different positions in the nuclear reactor based on the benchmark control operating conditions. The different positions include the downflow section position in the nuclear reactor and the water section position between the center plate and the hanging basket in the nuclear reactor.

[0134] Each module in the above-mentioned ex-pile detector calibration device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0135] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in Figure 8. The computer device includes a processor, a memory, an input / output interface (I / O) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store off-heap detector calibration data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, it implements an off-heap detector calibration method.

[0136] Those skilled in the art will understand that the structure shown in FIG8 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0137] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0138] Acquiring initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and acquiring detection power calibration parameters corresponding to the initial detection power data;

[0139] Calibrate the initial detection power data using the detection power calibration parameters to obtain calibrated target detection power data;

[0140] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power working conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the out-of-core detector.

[0141] In one embodiment, when the processor executes the computer program, the processor specifically implements the following steps:

[0142] Calculating detector response factors corresponding to the multiple power operating conditions by using the different water temperature operating conditions in the constructed multiple power operating conditions and a preset probability algorithm;

[0143] The detection power calibration coefficient is calculated according to a first detector response factor corresponding to a full power operating condition among the multiple power operating conditions.

[0144] In one embodiment, when the processor executes the computer program, the processor specifically implements the following steps:

[0145] Calculating a first theoretical current value of the ex-core detector under the full-power operating condition according to the first detector response factor;

[0146] Substitute the first theoretical current value into the preset equation group and solve it to obtain the detection power calibration parameter.

[0147] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0148] calculating a second theoretical current value of the ex-core detector under the non-full power condition according to a second detector response factor corresponding to the non-full power condition among the multiple power conditions;

[0149] The power indication deviation value is calculated according to the second theoretical current value and the detection power calibration parameter.

[0150] In one embodiment, when the processor executes the computer program, the processor specifically implements the following steps:

[0151] Multiplying the detection power calibration coefficient by the initial detection power data to obtain intermediate detection power data;

[0152] The intermediate detection power data is corrected using the power indication deviation value to obtain the target detection power data.

[0153] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0154] The operating conditions of different water temperatures are obtained by adjusting the water temperatures at different positions in the nuclear reactor based on the benchmark control operating conditions, and the different positions include the downflow section position in the nuclear reactor and the water section position between the coaming and the hanging basket in the nuclear reactor.

[0155] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0156] Acquiring initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and acquiring detection power calibration parameters corresponding to the initial detection power data;

[0157] Calibrate the initial detection power data using the detection power calibration parameters to obtain calibrated target detection power data;

[0158] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power working conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the out-of-core detector.

[0159] In one embodiment, when the computer program is executed by a processor, the following steps are specifically implemented:

[0160] Calculating detector response factors corresponding to the multiple power operating conditions by using the different water temperature operating conditions in the constructed multiple power operating conditions and a preset probability algorithm;

[0161] The detection power calibration coefficient is calculated according to a first detector response factor corresponding to a full power operating condition among the multiple power operating conditions.

[0162] In one embodiment, when the computer program is executed by a processor, the following steps are specifically implemented:

[0163] Calculating a first theoretical current value of the ex-core detector under the full-power operating condition according to the first detector response factor;

[0164] Substitute the first theoretical current value into the preset equation group and solve it to obtain the detection power calibration parameter.

[0165] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0166] calculating a second theoretical current value of the ex-core detector under the non-full power condition according to a second detector response factor corresponding to the non-full power condition among the multiple power conditions;

[0167] The power indication deviation value is calculated according to the second theoretical current value and the detection power calibration parameter.

[0168] In one embodiment, when the computer program is executed by a processor, the following steps are specifically implemented:

[0169] Multiplying the detection power calibration coefficient by the initial detection power data to obtain intermediate detection power data;

[0170] The intermediate detection power data is corrected using the power indication deviation value to obtain the target detection power data.

[0171] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0172] The operating conditions of different water temperatures are obtained by adjusting the water temperatures at different positions in the nuclear reactor based on the benchmark control operating conditions, and the different positions include the downflow section position in the nuclear reactor and the water section position between the coaming and the hanging basket in the nuclear reactor.

[0173] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0174] Acquiring initial detection power data obtained by an ex-core detector performing ex-core detection on a target nuclear reactor, and acquiring detection power calibration parameters corresponding to the initial detection power data;

[0175] Calibrate the initial detection power data using the detection power calibration parameters to obtain calibrated target detection power data;

[0176] Among them, the detection power calibration parameters are obtained by calculating the working conditions of different water temperatures in multiple power working conditions in the constructed nuclear reactor. The working conditions of different water temperatures are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the out-of-core detector.

[0177] In one embodiment, when the computer program is executed by a processor, the following steps are specifically implemented:

[0178] Calculating detector response factors corresponding to the multiple power operating conditions by using the different water temperature operating conditions in the constructed multiple power operating conditions and a preset probability algorithm;

[0179] The detection power calibration coefficient is calculated according to a first detector response factor corresponding to a full power operating condition among the multiple power operating conditions.

[0180] In one embodiment, when the computer program is executed by a processor, the following steps are specifically implemented:

[0181] Calculating a first theoretical current value of the ex-core detector under the full-power operating condition according to the first detector response factor;

[0182] Substitute the first theoretical current value into the preset equation group and solve it to obtain the detection power calibration parameter.

[0183] In one embodiment, when the computer program is executed by a processor, the computer program further implements the following steps:

[0184] calculating a second theoretical current value of the ex-core detector under the non-full power condition according to a second detector response factor corresponding to the non-full power condition among the multiple power conditions;

[0185] The power indication deviation value is calculated according to the second theoretical current value and the detection power calibration parameter.

[0186] In one embodiment, when the computer program is executed by a processor, the following steps are specifically implemented:

[0187] Multiplying the detection power calibration coefficient by the initial detection power data to obtain intermediate detection power data;

[0188] The intermediate detection power data is corrected using the power indication deviation value to obtain the target detection power data.

[0189] In one embodiment, when the computer program is executed by a processor, the computer program further implements the following steps:

[0190] The operating conditions of different water temperatures are obtained by adjusting the water temperatures at different positions in the nuclear reactor based on the benchmark control operating conditions, and the different positions include the downflow section position in the nuclear reactor and the water section position between the coaming and the hanging basket in the nuclear reactor.

[0191] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0192] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for calibrating an out-of-pile detector, characterized in that: The method comprises: Acquire initial detection power data obtained by an external-core detector performing external detection on a target nuclear reactor, and acquire detection power calibration parameters corresponding to the initial detection power data; Calibrate the initial detection power data using the detection power calibration parameters to obtain calibrated target detection power data; Among them, the detection power calibration parameters are calculated through different water temperature conditions in multiple power conditions in the constructed nuclear reactor, and the different water temperature conditions are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the external detector.

2. The method according to claim 1, characterized in that The detection power calibration parameter includes a detection power calibration coefficient corresponding to the full power condition, and the acquisition of the detection power calibration parameter corresponding to the initial detection power data includes: Calculate the detector response factors corresponding to the multiple power conditions by using the different water temperature conditions among the constructed multiple power conditions and a preset probability algorithm; The detection power calibration coefficient is calculated according to a first detector response factor corresponding to a full power condition among the multiple power conditions.

3. The method according to claim 2, characterized in that The calculating the detection power calibration coefficient according to the first detector response factor corresponding to the full power condition among the multiple power conditions includes: Calculating a first theoretical current value of the ex-core detector under the full power condition according to the first detector response factor; Substitute the first theoretical current value into the preset equation group for solution to obtain the detection power calibration parameter.

4. The method according to claim 2, characterized in that: In the case where the current working condition of the ex-core detector is a non-full power working condition, the detection power calibration parameter further includes a power indication deviation value between the non-full power working condition and the full power working condition, and the method further includes: Calculating a second theoretical current value of the ex-core detector under the non-full power condition according to a second detector response factor corresponding to the non-full power condition among the multiple power conditions; The power indication deviation value is calculated according to the second theoretical current value and the detection power calibration parameter.

5. The method according to claim 4, characterized in that The initial detection power data is calibrated using the detection power calibration parameters to obtain calibrated target detection power data, including: Multiplying the detection power calibration coefficient by the initial detection power data to obtain intermediate detection power data; The intermediate detection power data is corrected using the power indication deviation value to obtain the target detection power data.

6. The method according to claim 1, characterized in that The operating conditions with different water temperatures are obtained by adjusting the water temperatures at different positions in the nuclear reactor based on the reference control operating conditions, and the different positions include the position of the downflow water section in the nuclear reactor and the position of the water section between the coaming and the hanging basket in the nuclear reactor.

7. An out-of-core detector calibration device based on water temperature, characterized in that: The device comprises: An acquisition module is used to acquire initial detection power data obtained by an external-core detector for performing external detection on a target nuclear reactor, and to acquire detection power calibration parameters corresponding to the initial detection power data; A processing module, used to calibrate the initial detection power data using the detection power calibration parameters to obtain calibrated target detection power data; Among them, the detection power calibration parameters are calculated through different water temperature conditions in multiple power conditions in the constructed nuclear reactor, and the different water temperature conditions are used to simulate the influence of different in-core water temperature distributions on the detection power data detected by the external detector.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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