A method, system, equipment, and medium for online protection calculation and calibration of LPD and DNBR.

Abstract

This invention relates to the field of nuclear power plant reactor nuclear measurement technology, specifically to an online protection calculation calibration method, system, equipment, and medium for LPD and DNBR. The method involves sending control signals to initiate fine-grained calculations to a first server and a second server, comparing the calculation results of the first and second servers, and then comparing the calculation results of a third server with those of the first or second server. Through multiple verifications and comparisons using this method, more accurate reconstruction coefficients are obtained, and the parameters required by the protection calculation system can be obtained from these coefficients. This significantly improves the reliability and accuracy of the calibration results. Diverse calibration schemes effectively prevent common-cause failures in protection signal calibration, automatically verify the correctness of protection parameter calculations, and reduce the risk of false triggering of LPD and DNBR protection signals.

Description

Technical Field

[0001] This invention relates to the field of nuclear measurement technology for nuclear power plant reactors, and more specifically, to an online protection calculation and calibration method, system, equipment, and medium for LPD and DNBR. Background Technology

[0002] The core measurement system continuously calculates core state parameters such as three-dimensional power distribution, fuel assembly linear power density (LPD), and deviation from nucleus boiling ratio (DNBR) by collecting data from neutron detectors deployed in the core, combined with reactor power plant operating signals and control rod position signals. It then provides protection and control signals to the protection and control systems. The core measurement system consists of a detector section and signal processing equipment.

[0003] The signal processing equipment is divided into upper and lower layers. The functions and tasks of each layer are as follows: the lower layer system is responsible for the rapid calculation of LPD / DNBR protection parameters and related protection and control functions; the upper layer system is responsible for the fine calculation and monitoring of LPD / DNBR, as well as the rapid calculation and alarm functions of upper-layer LPD / DNBR monitoring parameters. It also periodically or irregularly transmits the reconstruction coefficients required for rapid protection calculations to the lower layer system, using these reconstruction coefficients to recalculate the parameters required for online protection calculations of LPD and DNBR. The fine calculations at the upper layer are implemented using two redundant servers with different algorithms and reconstruction coefficients. The results calculated by the two servers determine whether the reconstruction coefficients need to be changed.

[0004] However, the current method of verifying the results of two different servers is rather simple, that is, the final calibration result is obtained by comparing the results of a single test between the two servers, which will cause a large error. Summary of the Invention

[0005] The purpose of this invention is to provide an online protection calculation and calibration method, system, device, and medium for LPD and DNBR to solve the above-mentioned problems in the prior art.

[0006] This invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides an online protection calculation and calibration method for LPD and DNBR, comprising:

[0008] Step 1: Obtain the basic parameters of the nuclear reactor and determine whether any of the basic parameters exceed the preset value. If not, no action is taken.

[0009] Step 2: If so, send control signals to initiate fine calculation to the first server and the second server respectively. The fine calculation is LPD and DNBR calculation.

[0010] Step 3: Obtain the first LPD value and the first DNBR value of the first server and the second LPD value and the second DNBR value of the second server. If the difference between the first LPD value and the second LPD value is less than the preset value of LPD and the difference between the first DNBR value and the second DNBR value is less than the preset value of DNBR, then select the first server or the second server as the first target server. Save the LPD value and DNBR value of the first target server as the first target LPD value and the first target DNBR value. Otherwise, reset the reconstruction coefficients and return to step 2.

[0011] Step 4: Obtain the current real-time reactor data. Calculate LPD and DNBR using the third server based on the current real-time reactor data and the reconfiguration coefficients to obtain the third LPD value and the third DNBR value. If the difference between the first target LPD value and the third LPD value is less than the preset LPD value and the difference between the first target DNBR value and the third DNBR value is less than the preset DNBR value, then select either the third server or the first target server as the second target server. Save the LPD value and DNBR value of the second target server as the second target LPD value and the second target DNBR value. Otherwise, reset the reconfiguration coefficients and return to Step 2.

[0012] Step 5: Obtain the fourth LPD value and the fourth DNBR value calculated by the lower-level computing unit based on the current reconstruction coefficients. The calculation accuracy of the lower-level computing unit is less than that of the first server and the second server. If the difference between the second target LPD value and the fourth LPD value is less than the preset value of LPD and the difference between the second target DNBR value and the fourth DNBR value is less than the preset value of DNBR, then determine the current reconstruction coefficients and transmit the reconstruction coefficients to the lower-level computing unit. Otherwise, reset the reconstruction coefficients and return to Step 2.

[0013] Preferably, the basic parameters include the rate of change of nuclear power, the rate of change of rod position drop, the rate of change of boron concentration, and the calculation time interval between the two reconstruction parameters.

[0014] Preferably, the calculations of the first server and the second server are independent of each other, and the calculation algorithms of the first server and the second server are redundantly checked and cross-checked.

[0015] Preferably, the redundancy cross-checking includes:

[0016] Prepare for the heterogeneous environment, acquire data, and perform dual verification;

[0017] Perform atomic calculations, compare results in real time, and generate reliable results.

[0018] Preferably, the real-time result comparison includes:

[0019] Initiate the isolation sandbox for the third independent calculation;

[0020] If the sandbox result matches any server, it is marked as trusted.

[0021] Perform memory dump analysis and hardware health checks on inconsistent servers.

[0022] Preferably, the reconstructed parameters include:

[0023] Save the reconstruction coefficients of the second objective calculation results, and reconstruct the parameters using the reconstruction coefficients;

[0024] The reconstruction parameters include preprocessing of basic data, parameter reconstruction of the DNBR model, and LPD protection calculation reconstruction.

[0025] Secondly, the present invention also provides an online protection calculation and calibration device for LPD and DNBR, comprising: an upper control cabinet and a lower protection cabinet, wherein the lower protection cabinet is used to perform protection calculations, and the upper control cabinet is used to perform calculations and obtain reconstruction coefficients, and the protection calculations are calibrated using highly reliable reconstruction coefficients.

[0026] Preferred, including:

[0027] When the lower-level protection cabinet enters maintenance mode, the upper-level control cabinet issues the reconfiguration coefficients after completing the verification.

[0028] The lower protection cabinet receives and verifies the reconstruction coefficients, and feeds back the verification results to the upper control cabinet.

[0029] The upper-level control cabinet receives the verification result reply status from the lower-level control cabinet. If the verification is successful, it continues to send the next file; if the verification fails, it resends the file that failed the verification. When the number of resends is reached, the upper-level control cabinet is notified of the verification failure and the file name.

[0030] Thirdly, the present invention also provides an online protection calculation and calibration system for LPD and DNBR, comprising:

[0031] The upper-level calculation module is configured to acquire various basic parameters of the nuclear reactor and determine whether each basic parameter exceeds a preset value. If not, no action is taken; if so, control signals to initiate fine calculations are sent to the first server and the second server respectively. The fine calculations are LPD and DNBR calculations. The first LPD value and the first DNBR value of the first server and the second LPD value and the second DNBR value of the second server are acquired. If the difference between the first LPD value and the second LPD value is less than the preset LPD value and the difference between the first DNBR value and the second DNBR value is less than the preset DNBR value, then the first server or the second server is selected as the first target server. The LPD value and DNBR value of the first target server are saved as the first target LPD value and the first target DNBR value. Otherwise, the reconstruction coefficients are reset, and the process returns to step two.

[0032] The upper-level fast detection and calculation module obtains the current real-time reactor data. Based on the current real-time reactor data and the reconstruction coefficient, the third server calculates LPD and DNBR to obtain the third LPD value and the third DNBR value. If the difference between the first target LPD value and the third LPD value is less than the preset LPD value and the difference between the first target DNBR value and the third DNBR value is less than the preset DNBR value, then the third server or the first target server is selected as the second target server. The LPD value and DNBR value of the second target server are saved as the second target LPD value and the second target DNBR value. Otherwise, the reconstruction coefficient is reset and the process returns to step two.

[0033] The lower-level computing module is configured to: obtain the fourth LPD value and the fourth DNBR value obtained by the lower-level computing unit based on the current reconstruction coefficients for LPD and DNBR calculations. The calculation accuracy of the lower-level computing unit is less than that of the first server and the second server. If the difference between the second target LPD value and the fourth LPD value is less than the preset value of LPD and the difference between the second target DNBR value and the fourth DNBR value is less than the preset value of DNBR, then the current reconstruction coefficients are determined and the reconstruction coefficients are transmitted to the lower-level computing unit. Otherwise, the reconstruction coefficients are reset and the process returns to step two.

[0034] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for online protection calculation and calibration of LPD and DNBR.

[0035] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0036] The method disclosed in this invention mainly includes determining whether each basic parameter exceeds a preset value. If not, no action is taken; if so, a control signal to initiate fine calculation is sent to the first server and the second server respectively. The calculation results of the first server and the second server are compared. For the calculation results of the third server and the first or second server, the calculation results of the lower-level calculation unit are compared with those of the first, second, or third server. Through multiple verifications and comparisons using the above method, more accurate reconstruction coefficients are finally obtained. The parameters required by the protection calculation system can be obtained through the reconstruction coefficients, significantly improving the reliability and accuracy of the calibration results. Diverse calibration schemes can effectively prevent common-cause failures in protection signal calibration, automatically verify the correctness of protection parameter calculations, and reduce the risk of false triggering of LPD and DNBR protection signals. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the control flow of the present invention;

[0039] Figure 2 This is a schematic diagram of the system structure of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The naming or numbering of steps in this application does not imply that the steps in the method flow must be executed in the chronological / logical order indicated by the naming or numbering. The execution order of named or numbered process steps can be changed according to the desired technical objective, as long as the same or similar technical effect is achieved.

[0042] The independently described modules or sub-modules may or may not be physically separated; they may be implemented in software or hardware, and some modules or sub-modules may be implemented in software, with the processor calling the software to implement the function of these modules or sub-modules, while other modules or sub-modules may be implemented in hardware, such as through hardware circuits. Furthermore, some or all of the modules can be selected to achieve the purpose of this application's solution according to actual needs.

[0043] Please refer to Figures 1-2 This invention provides an online protection calculation and calibration method for LPD and DNBR, comprising:

[0044] Step 1: Obtain the basic parameters of the nuclear reactor and determine whether any of the basic parameters exceed the preset value. If not, no action is taken.

[0045] Among them, the basic parameters include the rate of change of nuclear power, the rate of change of rod position drop, the rate of change of boron concentration, and the calculation time interval between the two reconstruction parameters.

[0046] The upper-level fine calculation is performed using two different servers. The results of the two fine calculations are optimized to obtain the optimal basic parameters of the nuclear reactor. The reconstruction coefficient is calculated using the basic parameters of the current nuclear reactor, and the input parameters required for protection calculation are generated using the reconstruction coefficient.

[0047] Step 2: If so, send control signals to initiate fine calculation to the first server and the second server respectively. The fine calculation is LPD and DNBR calculation.

[0048] Step 3: Obtain the first LPD value and the first DNBR value of the first server and the second LPD value and the second DNBR value of the second server. If the difference between the first LPD value and the second LPD value is less than the preset value of LPD and the difference between the first DNBR value and the second DNBR value is less than the preset value of DNBR, then select the first server or the second server as the first target server. Save the LPD value and DNBR value of the first target server as the first target LPD value and the first target DNBR value. Otherwise, reset the reconstruction coefficients and return to step 2.

[0049] Specifically, by using the reconstruction coefficient in conjunction with the current power plant operating condition signal to verify and calculate parameters such as LPD and DNBR, the results of the two servers are directly compared. The same algorithm program runs on the two servers, with only differences in server architecture and manufacturer parameters. When the deviation exceeds the limit (e.g., more than 5%), the fine calculation is restarted.

[0050] Regarding the selection of one server to save the calculation result as the first target calculation result, the reconstruction coefficient calculation result of one server is selected when the deviation is within the threshold. Either server can be selected because the deviation between the calculation results of the two servers is within an acceptable range. The first server can be selected by default, or the optimal server can be selected based on the server's performance, such as stability, factory testing and results.

[0051] Step 4: Obtain the current real-time reactor data. Calculate LPD and DNBR using the third server based on the current real-time reactor data and the reconfiguration coefficients to obtain the third LPD value and the third DNBR value. If the difference between the first target LPD value and the third LPD value is less than the preset LPD value and the difference between the first target DNBR value and the third DNBR value is less than the preset DNBR value, then select either the third server or the first target server as the second target server. Save the LPD value and DNBR value of the second target server as the second target LPD value and the second target DNBR value. Otherwise, reset the reconfiguration coefficients and return to Step 2.

[0052] Step 5: Obtain the fourth LPD value and the fourth DNBR value calculated by the lower-level computing unit based on the current reconstruction coefficients. The calculation accuracy of the lower-level computing unit is less than that of the first server and the second server. If the difference between the second target LPD value and the fourth LPD value is less than the preset value of LPD and the difference between the second target DNBR value and the fourth DNBR value is less than the preset value of DNBR, then determine the current reconstruction coefficients and transmit the reconstruction coefficients to the lower-level computing unit. Otherwise, reset the reconstruction coefficients and return to Step 2.

[0053] The calculation of LPD includes:

[0054] 1) Current processing: It is processed from two aspects: the processing of the measured current of the in-pile detector and the simulation of the theoretical current of the detector under real environment;

[0055] 2) Component power expansion: The fuel assembly is divided into several sections. For the section where the detector is located, the measured power of the detector layer is calculated. For the section where the detector is not located, the component power is radially expanded using the coupling coefficient method. Then, the component power is axially expanded using the interpolation fitting method.

[0056] 3) Simulator: Input the calculation results from step 2 into the simulator to perform real-time simulation calculation of the reactor core to calculate the reactor operating status, obtain the core power distribution, the power distribution within the block, the detector reaction rate, and predict the transient changes of the core xenon.

[0057] 4) Power Reconfiguration: By reconfiguring the local power distribution within the fuel assembly, the location and magnitude of the power peak and the local power at the detector are calculated;

[0058] 5) LPD rapid calculation: Establish the power conversion coefficient of the detector current and the component blocks within the effective influence domain of the detector, which is periodically or on demand passed to the lower layer; the set of detector effective influence domains contained in each protection cabinet includes the entire core.

[0059] The DNBR calculation includes:

[0060] Initialize and assign data;

[0061] Interface data input includes the measured current data from the SPND (Self-Powered Detector) of the nuclear power plant's core measurement system and the measured operating parameters of the reactor's main coolant system.

[0062] Based on the input interface data, fuel components are screened;

[0063] Thermal and hydraulic parameters were calculated for the selected fuel assemblies;

[0064] Based on the calculated thermal-hydraulic parameters, DNBR calculations are performed.

[0065] Based on the calculation results of DNBR, perform DNBR margin calculation;

[0066] Based on the DNBR margin calculation results, the online DNBR calculation results are output.

[0067] The method disclosed in this invention mainly includes determining whether each basic parameter exceeds a preset value. If not, no action is taken. If so, a control signal to initiate fine calculation is sent to a first server and a second server respectively. The calculation results of the first server and the second server are compared to see if they are less than a first threshold. The first calculation result is compared with a first target calculation result, and it is determined whether it is less than a second threshold. The second calculation result is compared with a second target calculation result, and it is determined whether it is less than a third threshold. Through multiple verifications and comparisons using the above method, more accurate reconstruction coefficients are obtained for reconstructing parameters, significantly improving the reliability and accuracy of calibration results. Diverse calibration schemes can effectively prevent common-cause failures in protection signal calibration. The correctness of protection parameter calculations is automatically verified, reducing the risk of false triggering of LPD and DNBR protection signals.

[0068] In one exemplary embodiment of the present invention, the calculations of the first server and the second server are independent of each other, and the calculation algorithms of the first server and the second server are redundantly checked.

[0069] Here is a specific practical example to further illustrate the above method:

[0070] In the upper-level system, two different servers are configured to run different algorithms simultaneously for fine-tuning calculations. The calculation results are initially verified, and the user is prompted to recalculate the relevant parameters when the difference between the two calculation results exceeds a preset threshold. When the deviation between the two calculation results is within the threshold range, the optimal result is selected as the fine-tuning result.

[0071] The upper-level system performs a second verification of the fine calculation results through rapid calculation. When the difference between the calculation results exceeds a preset threshold, the user is reminded to recalculate the relevant parameters.

[0072] In the lower-level system, the reconstruction coefficients are verified for the third time. When the upper-level optimization result and the protection calculation result exceed the preset threshold, the user is reminded to recalculate the relevant parameters.

[0073] In a preferred embodiment, the protection parameters are calibrated periodically or irregularly.

[0074] Based on design and operational requirements, in maintenance mode, fine calculations are periodically initiated and the updated calculation parameters are transmitted down to the lower-level protection system.

[0075] The system monitors changes in nuclear power, boron concentration, and control rod position related to the reactor core status in real time, and compares them with the corresponding preset thresholds. When the values ​​exceed the limits, the system alerts the user to initiate fine calculations and downloads the updated calculation parameters to the lower-level protection system.

[0076] In one exemplary embodiment of the present invention, redundancy cross-checking includes:

[0077] Preparing for heterogeneous environments includes hardware differentiation:

[0078] The system deploys Intel Xeon (equipped with AVX-512 instruction set) and AMD EPYC (with SEV encryption enabled) platforms respectively; the memory modules employ a hybrid configuration of ECC and Non-ECC verification. Software stack isolation and clock synchronization are also included.

[0079] Perform atomic calculations, compare results in real time, and generate reliable results.

[0080] The data undergoes dual verification, including secure transmission, integrity checks, and format standardization.

[0081] Atomized computation triggering includes distributed lock control and computational resource isolation.

[0082] Specifically, real-time result comparison includes:

[0083] Initiate the isolation sandbox for the third independent calculation;

[0084] If the sandbox result matches any server, it is marked as trusted.

[0085] Perform memory dump analysis and hardware health checks on inconsistent servers.

[0086] Preferably, the reconstructed parameters include:

[0087] Save the reconstruction coefficients of the second objective calculation results, and reconstruct the parameters using the reconstruction coefficients;

[0088] The reconstruction parameters include preprocessing of basic data, parameter reconstruction of the DNBR model, and LPD protection calculation reconstruction.

[0089] Secondly, the present invention also provides an online protection calculation and calibration device for LPD and DNBR, comprising: an upper control cabinet and a lower protection cabinet, wherein the lower protection cabinet is used to perform protection calculations, and the upper control cabinet is used to perform calculations and obtain reconstruction coefficients, and the protection calculations are calibrated using highly reliable reconstruction coefficients.

[0090] The reconstruction coefficient calculation results from two different algorithms and platforms are used for cross-calibration. After cross-calibration, the optimal algorithm is used to obtain the correct reconstruction coefficient.

[0091] Before being used for protection, the reconstructed coefficients are first downloaded to the upper-level rapid monitoring calculation for verification to ensure their correctness.

[0092] Also includes:

[0093] When the lower-level protection cabinet enters maintenance mode, the upper-level control cabinet issues the reconfiguration coefficients after completing the verification.

[0094] The lower protection cabinet receives and verifies the reconstruction coefficients, and feeds back the verification results to the upper control cabinet.

[0095] The upper-level control cabinet receives the verification result reply status from the lower-level control cabinet. If the verification is successful, it continues to send the next file; if the verification fails, it resends the file that failed the verification. When the number of resends is reached, the upper-level control cabinet is notified of the verification failure and the file name.

[0096] After ensuring correctness, the calculation is then downloaded to the lower-level protection calculation, and the lower-level protection calculation performs a calculation verification, cross-checking the calculation results with the calculation results of the upper-level rapid calculation.

[0097] For the calibration of lower-level protection calculations using reconstruction coefficients, both periodic and irregular methods can be adopted. For the irregular method, automatic prompts can be achieved based on multiple judgment criteria.

[0098] After successful download, the reconstructed coefficients are automatically encapsulated in read-only format and protected with dedicated storage and verification.

[0099] This invention also provides an online protection calculation and calibration system for LPD and DNBR, comprising:

[0100] The upper-level calculation module is configured to acquire various basic parameters of the nuclear reactor and determine whether each basic parameter exceeds a preset value. If not, no action is taken; if so, control signals to initiate fine calculations are sent to the first server and the second server respectively. The fine calculations are LPD and DNBR calculations. The first LPD value and the first DNBR value of the first server and the second LPD value and the second DNBR value of the second server are acquired. If the difference between the first LPD value and the second LPD value is less than the preset LPD value and the difference between the first DNBR value and the second DNBR value is less than the preset DNBR value, then the first server or the second server is selected as the first target server. The LPD value and DNBR value of the first target server are saved as the first target LPD value and the first target DNBR value. Otherwise, the reconstruction coefficients are reset, and the process returns to step two.

[0101] The upper-level fast detection and calculation module obtains the current real-time reactor data. Based on the current real-time reactor data and the reconstruction coefficient, the third server calculates LPD and DNBR to obtain the third LPD value and the third DNBR value. If the difference between the first target LPD value and the third LPD value is less than the preset LPD value and the difference between the first target DNBR value and the third DNBR value is less than the preset DNBR value, then the third server or the first target server is selected as the second target server. The LPD value and DNBR value of the second target server are saved as the second target LPD value and the second target DNBR value. Otherwise, the reconstruction coefficient is reset and the process returns to step two.

[0102] The lower-level computing module is configured to: obtain the fourth LPD value and the fourth DNBR value obtained by the lower-level computing unit based on the current reconstruction coefficients for LPD and DNBR calculations. The calculation accuracy of the lower-level computing unit is less than that of the first server and the second server. If the difference between the second target LPD value and the fourth LPD value is less than the preset value of LPD and the difference between the second target DNBR value and the fourth DNBR value is less than the preset value of DNBR, then the current reconstruction coefficients are determined and the reconstruction coefficients are transmitted to the lower-level computing unit. Otherwise, the reconstruction coefficients are reset and the process returns to step two.

[0103] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0104] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. This computer software product, stored in a storage medium, includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0105] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for online protection calculation and calibration of LPD and DNBR, characterized in that, include: Step 1: Obtain the basic parameters of the nuclear reactor and determine whether any of the basic parameters exceed the preset value. If not, no action is taken. Step 2: If so, send control signals to initiate fine calculation to the first server and the second server respectively. The fine calculation is LPD and DNBR calculation. Step 3: Obtain the first LPD value and the first DNBR value of the first server and the second LPD value and the second DNBR value of the second server. If the difference between the first LPD value and the second LPD value is less than the preset value of LPD and the difference between the first DNBR value and the second DNBR value is less than the preset value of DNBR, then select the first server or the second server as the first target server. Save the LPD value and DNBR value of the first target server as the first target LPD value and the first target DNBR value. Otherwise, reset the reconstruction coefficients and return to step 2. Step 4: Obtain the current real-time reactor data. Calculate LPD and DNBR using the third server based on the current real-time reactor data and the reconfiguration coefficients to obtain the third LPD value and the third DNBR value. If the difference between the first target LPD value and the third LPD value is less than the preset LPD value and the difference between the first target DNBR value and the third DNBR value is less than the preset DNBR value, then select either the third server or the first target server as the second target server. Save the LPD value and DNBR value of the second target server as the second target LPD value and the second target DNBR value. Otherwise, reset the reconfiguration coefficients and return to Step 2. Step 5: Obtain the fourth LPD value and the fourth DNBR value calculated by the lower-level computing unit based on the current reconstruction coefficients. The calculation accuracy of the lower-level computing unit is less than that of the first server and the second server. If the difference between the second target LPD value and the fourth LPD value is less than the preset value of LPD and the difference between the second target DNBR value and the fourth DNBR value is less than the preset value of DNBR, then determine the current reconstruction coefficients and transmit the reconstruction coefficients to the lower-level computing unit. Otherwise, reset the reconstruction coefficients and return to Step 2.

2. The method for online protection calculation and calibration of LPD and DNBR according to claim 1, characterized in that, The basic parameters include the rate of change of nuclear power, the rate of change of rod position drop, the rate of change of boron concentration, and the time interval between the calculation of the two reconstruction parameters.

3. The method for online protection calculation and calibration of LPD and DNBR according to claim 2, characterized in that, The calculations of the first server and the second server are independent of each other, and the calculation algorithms of the first server and the second server are redundantly checked and cross-checked.

4. The online protection calculation and calibration method for LPD and DNBR according to claim 3, characterized in that, The redundancy cross-checking includes: Prepare for the heterogeneous environment, acquire data, and perform dual verification; Perform atomic calculations, compare results in real time, and generate reliable results.

5. The online protection calculation and calibration method for LPD and DNBR according to claim 4, characterized in that, The real-time result comparison includes: Initiate the isolation sandbox for the third independent calculation; If the sandbox result matches any server, it is marked as trusted. Perform memory dump analysis and hardware health checks on inconsistent servers.

6. The online protection calculation and calibration method for LPD and DNBR according to claim 5, characterized in that, The reconstruction parameters include: Save the reconstruction coefficients of the second objective calculation results, and reconstruct the parameters using the reconstruction coefficients; The reconstruction parameters include preprocessing of basic data, parameter reconstruction of the DNBR model, and LPD protection calculation reconstruction.

7. An online protection calculation and calibration device for LPD and DNBR, characterized in that, The method for performing online protection calculation and calibration of LPD and DNBR as described in claim 1 includes: an upper control cabinet and a lower protection cabinet, wherein the lower protection cabinet is used to perform protection calculations, and the upper control cabinet is used to perform calculations and obtain reconstruction coefficients, and the protection calculations are calibrated using highly reliable reconstruction coefficients.

8. The LPD and DNBR online protection calculation and calibration device according to claim 7, characterized in that, Also includes: When the lower-level protection cabinet enters maintenance mode, the upper-level control cabinet issues the reconfiguration coefficients after completing the verification. The lower protection cabinet receives and verifies the reconstruction coefficients, and feeds back the verification results to the upper control cabinet. The upper-level control cabinet receives the verification result from the lower-level control cabinet. If the verification is successful, it continues to send the next file. If the verification fails, the file containing the failed verification will be resent. When the number of resentments is reached, the upper-level control cabinet will be notified of the verification failure and the file name.

9. An online protection calculation and calibration system for LPD and DNBR, characterized in that, include: The upper-level calculation module is configured to acquire various basic parameters of the nuclear reactor and determine whether each basic parameter exceeds a preset value. If not, no action is taken; if so, control signals to initiate fine calculations are sent to the first server and the second server respectively. The fine calculations are LPD and DNBR calculations. The first LPD value and the first DNBR value of the first server and the second LPD value and the second DNBR value of the second server are acquired. If the difference between the first LPD value and the second LPD value is less than the preset LPD value and the difference between the first DNBR value and the second DNBR value is less than the preset DNBR value, then the first server or the second server is selected as the first target server. The LPD value and DNBR value of the first target server are saved as the first target LPD value and the first target DNBR value. Otherwise, the reconstruction coefficients are reset, and the process returns to step two. The upper-level fast detection and calculation module obtains the current real-time reactor data. Based on the current real-time reactor data and the reconstruction coefficient, the third server calculates LPD and DNBR to obtain the third LPD value and the third DNBR value. If the difference between the first target LPD value and the third LPD value is less than the preset LPD value and the difference between the first target DNBR value and the third DNBR value is less than the preset DNBR value, then the third server or the first target server is selected as the second target server. The LPD value and DNBR value of the second target server are saved as the second target LPD value and the second target DNBR value. Otherwise, the reconstruction coefficient is reset and the process returns to step two. The lower-level computing module is configured to: obtain the fourth LPD value and the fourth DNBR value obtained by the lower-level computing unit based on the current reconstruction coefficients for LPD and DNBR calculations. The calculation accuracy of the lower-level computing unit is less than that of the first server and the second server. If the difference between the second target LPD value and the fourth LPD value is less than the preset value of LPD and the difference between the second target DNBR value and the fourth DNBR value is less than the preset value of DNBR, then the current reconstruction coefficients are determined and the reconstruction coefficients are transmitted to the lower-level computing unit. Otherwise, the reconstruction coefficients are reset and the process returns to step two.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements an online protection calculation and calibration method for LPD and DNBR as described in any one of claims 1-6.

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