Online monitoring and online protection calculation method and system suitable for large pressurized water reactor core

Abstract

The invention relates to the field of nuclear safety, in particular to an online monitoring and online protection calculation method and system suitable for a large pressurized water reactor core. The method comprises the following steps: selecting a typical operation state parameter combination according to the range of key operation state parameters of a reactor core; receiving real-time measurement data of the operation state parameters, calculating a plurality of sets of intermediate coefficients based on the reactor core state at the current moment t0 according to the selected operation state parameter combination, forming an intermediate coefficient library containing the plurality of sets of intermediate coefficients, and then carrying out rapid protection calculation on the formed intermediate coefficient library; meanwhile, a set of intermediate coefficients is calculated based on the reactor core state at the current moment t1 according to the current running state parameters measured in real time, and after calculation is completed, rapid monitoring calculation is conducted through the set of intermediate parameters. The system comprises a measuring system, an upper layer unit and a lower layer unit, the upper layer unit comprises a fine tracking calculation module and a rapid monitoring calculation module; and the lower layer unit comprises a rapid protection calculation module. According to the method, accurate and efficient calculation of the key safety parameters of the online protection system is realized, and the unit operation flexibility and economy of the pressurized water reactor core nuclear power plant are improved.

Description

Technical Field

[0001] This invention relates to the field of nuclear safety, and in particular to an online monitoring and online protection calculation method and system applicable to large pressurized water reactor cores. Background Technology

[0002] Linear power density (LPD) and deviation from nucleus boiling ratio (DNBR) are key parameters for pressurized water reactor (PWR) cores, and are also quantitative indicators of concern in online core monitoring and protection. To ensure reactor safety, LPD and DNBR should not exceed the prescribed limits.

[0003] Reactor online protection technology involves installing a core measurement system within the reactor to calculate neutron flux data within the reactor, thereby calculating overall reactor protection parameters and achieving the goal of reactor online protection.

[0004] In existing pressurized water reactor (PWR) online protection technologies, the calculation of protection parameters relies on intermediate coefficients. The intermediate coefficients calculated at time t in current online protection technologies are used for calculating protection parameters over a subsequent period (t+Δt), and these intermediate coefficients typically remain unchanged between t and t+Δt. However, if the state of the reactor core changes during this period (e.g., control rod insertion / removal), the intermediate coefficients calculated at time t cannot reflect the current core state. This leads to significant uncertainty in the protection parameters calculated using these intermediate coefficients, impacting the economic efficiency and operational range of the PWR. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide an online monitoring and online protection calculation method and system suitable for large pressurized water reactor cores, which realizes accurate and efficient calculation of key safety parameters of the online protection system and improves the operational flexibility and economy of pressurized water reactor core nuclear power plant units.

[0006] This invention provides an online monitoring and online protection calculation method suitable for large pressurized water reactor cores, comprising the following steps:

[0007] Step S1: Based on the range of key operating state parameters of the reactor core, select typical combinations of operating state parameters, including states that may occur during actual operation;

[0008] Step S2: Receive real-time measurement data of operating status parameters, calculate multiple sets of intermediate coefficients based on the selected combination of operating status parameters and the core state at the current time t0, form an intermediate coefficient library containing multiple sets of intermediate coefficients, and then pass the formed intermediate coefficient library to the lower unit for fast protection calculation.

[0009] Simultaneously, based on the current real-time measured operating status parameters and the core state at the current time t1, a set of intermediate coefficients is calculated. After the calculation is completed, the set of intermediate parameters is used for rapid monitoring calculation.

[0010] In a specific embodiment of the present invention, in step S1, the key operating state parameters of the reactor core are the position of the control rod group, the power level, and the inlet and outlet temperatures of the coolant.

[0011] In one specific embodiment of the present invention, the rapid protection calculation includes: establishing data index relationships, verifying and indexing measured operating parameters, calculating intermediate coefficients in real time, power reconstruction, calculating safety parameters, and outputting protection alarm signals.

[0012] In one specific embodiment of the present invention, the establishment of the data index relationship includes: processing the numerical values ​​of the combination of running status parameters into key values ​​that are easy to index according to rules, and establishing a correspondence relationship of intermediate coefficient data paths for threshold matching.

[0013] The intermediate coefficients are sourced from an intermediate coefficient library;

[0014] The actual measurement and indexing of operating parameters specifically includes: determining the legality of the values ​​of the operating status parameters measured in real time, calculating the upper and lower bound values ​​of the corresponding preset key operating status parameters; and reading and recording the key values ​​and corresponding intermediate coefficients in the intermediate coefficient library that enclose the upper and lower bounds of the operating status parameters measured in real time, based on the index relationship.

[0015] The real-time intermediate coefficient calculation specifically includes: based on the currently measured operating status parameters and the intermediate coefficients corresponding to the upper and lower bounds of the currently measured operating status parameters, using interpolation or fitting numerical calculation methods to calculate the intermediate coefficients corresponding to the current measured data in real time.

[0016] Power reconfiguration specifically includes: calculating the core power using intermediate coefficients of the current measured data, real-time measured operating status parameters, and self-powered neutron detector current data;

[0017] The safety parameter calculation specifically includes: calculating the safety parameters based on the reconfigured core power, comparing them with the preset protection limits, and determining the current core operation safety margin;

[0018] The protection alarm signal output specifically includes: determining whether to output a protection alarm signal based on the current core safety margin.

[0019] In one specific embodiment of the present invention, the rapid monitoring calculation includes: power reconstruction, safety parameter calculation, and monitoring alarm signal output determination.

[0020] In a specific embodiment of the present invention, the power reconfiguration specifically includes: calculating the core power using a set of calculated intermediate coefficients, real-time measured operating status parameters, and self-powered neutron detector current data;

[0021] The safety parameter calculation specifically includes: calculating the safety parameters based on the reconfigured core power, comparing them with preset monitoring limits, and determining the current core operation safety margin;

[0022] The specific steps for determining whether to output a monitoring alarm signal include: based on the current core safety margin, determining whether to output a monitoring signal.

[0023] In one specific embodiment of the present invention, the process of forming the intermediate coefficient library is triggered within a default periodic interval Δt0, or is triggered manually by the user; the default periodic interval Δt0 does not exceed 7 days.

[0024] Based on the current real-time measured operating status parameters and the core state at the current time t1, when calculating a set of intermediate coefficients, if the actual operating status changes and exceeds the set limit, the intermediate coefficient calculation needs to be started. This execution time is the time when the corresponding change occurs, with a lower limit of 1 minute and an upper limit of 30 minutes.

[0025] This invention provides an online monitoring and online protection calculation system suitable for large pressurized water reactor cores, comprising: a measurement system, an upper unit, and a lower unit;

[0026] The measurement system is used to measure key operating status parameters of the reactor core in real time; the measured key operating status parameters of the reactor core are transmitted to the upper and lower units respectively.

[0027] The upper-layer unit includes a fine-tracking calculation module and a fast-monitoring calculation module;

[0028] The fine tracking calculation module includes two independent calculation routes: one is to calculate a set of intermediate coefficients and pass them to the fast monitoring calculation module; the other is to calculate multiple sets of intermediate coefficients to form an intermediate database, and then pass the intermediate database to the fast protection calculation module of the lower unit.

[0029] The intermediate coefficient library stores multiple sets of intermediate coefficients calculated based on preset key operating state parameters.

[0030] The lower-level unit includes a fast protection calculation module.

[0031] In one specific embodiment of the present invention, the rapid monitoring and calculation module is used for power reconstruction, safety parameter calculation, and monitoring alarm signal output determination;

[0032] The rapid protection calculation module is used for establishing data index relationships, verifying and indexing measured operating parameters, calculating intermediate coefficients in real time, power reconstruction, calculating safety parameters, and outputting protection alarm signals.

[0033] In one specific embodiment of the present invention, the fine tracking calculation module is used for power reconstruction, safety parameter calculation, and monitoring alarm signal output determination; it also includes the following functions:

[0034] The numerical values ​​of the combination of running status parameters are processed into easy-to-index key values ​​according to certain rules, a corresponding relationship is established with the intermediate coefficient data path that matches them, and the processed index relationship is passed to the fast protection calculation module.

[0035] The rapid protection calculation module reads the data index relationship provided by the fine tracking module, which is used to establish the data index relationship in the lower unit, verify and index the measured operating parameters, calculate the intermediate coefficient in real time, reconstruct the power, calculate the safety parameters and output the protection alarm signal.

[0036] In one specific embodiment of the present invention, the measurement system is a reactor operation instrumentation and control system, and the input search condition is that the position of the control rod group is at the safety level.

[0037] Compared with existing technologies, the online monitoring and online protection calculation method and system of the present invention, applicable to large pressurized water reactor cores, employs an upper-level unit to periodically or manually trigger the calculation of multiple sets of intermediate coefficients based on preset key operating state parameters, forming an intermediate coefficient library, which is then transmitted to the lower-level unit. Since the intermediate coefficient library stores multiple sets of intermediate coefficients calculated based on preset key operating state parameters, it meets the accuracy requirements of the online protection system for intermediate coefficients within a short period. Therefore, before the next update of the intermediate coefficient library, the lower-level unit can calculate the corresponding intermediate coefficients based on the actual key operating state parameters of the reactor, effectively reducing the uncertainty caused by the mismatch between intermediate coefficients and the current state. Using the method described in this invention, multiple sets of intermediate coefficient libraries can be constructed based on preset key operating state parameters, and the intermediate coefficients can be updated in real time based on current measurements, thereby improving the calculation accuracy of safety parameters. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of an online monitoring and online protection computing system;

[0039] Figure 2 This is a flowchart illustrating the rapid protection calculation portion of the online protection calculation method based on the present invention. Detailed Implementation

[0040] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0041] Embodiments of the present invention also disclose an online monitoring and online protection computing system suitable for large pressurized water reactor cores, such as... Figure 1 As shown, it includes:

[0042] Measurement system, upper-level unit and lower-level unit;

[0043] The measurement system is a reactor operation instrumentation and control system, used to measure the core operating status parameters in real time; the measured core operating status parameters are transmitted to the upper and lower units respectively.

[0044] The search condition input into the measurement system is that the position of the control rod group is at the safety level;

[0045] The upper-layer unit includes a fine-tracking calculation module and a fast-monitoring calculation module;

[0046] The fine tracking calculation module includes two independent calculation routes: on the one hand, based on the current real-time measured operating status parameters and the core state at the current time t1, a set of intermediate coefficients is calculated, and then a set of intermediate parameters is passed to the fast monitoring calculation module.

[0047] Because actual operating conditions change, such as power levels, control rod positions, and core operating time, exceeding set limits, the fine tracking calculation module needs to be activated to complete the intermediate coefficient calculation based on the core operating conditions. The time interval for this calculation is Δt1, which ranges from 1 to 30 minutes.

[0048] On the other hand, based on the selected combination of operating state parameters and the core state at the current time t0, multiple sets of intermediate coefficients are calculated to form an intermediate coefficient library containing multiple sets of intermediate coefficients. Then, the intermediate coefficient library is passed to the fast protection calculation module of the lower unit.

[0049] The process of forming the intermediate coefficient library is triggered within a default periodic interval Δt0, or by manual triggering by the user; the default periodic interval Δt0 does not exceed 7 days.

[0050] The intermediate coefficient calculation task transmitted by the fine tracking calculation module to the fast monitoring calculation module and the intermediate coefficient library calculation task transmitted to the fast protection calculation module are independent, and their start and end do not affect each other.

[0051] The rapid monitoring and calculation module is used for power reconstruction, safety parameter calculation, and monitoring alarm signal output determination.

[0052] The power reconfiguration specifically includes: calculating the core power using a set of intermediate coefficients, real-time measured operating status parameters, and self-powered neutron detector current data;

[0053] The safety parameter calculation specifically includes: calculating the safety parameters based on the reconfigured core power, comparing them with preset monitoring limits, and determining the current core operation safety margin;

[0054] The determination of monitoring alarm signal output specifically includes: determining whether to output a monitoring alarm signal based on the current core safety margin.

[0055] The lower-level unit includes a fast protection calculation module;

[0056] The rapid protection calculation module is used for establishing data index relationships, verifying and indexing measured operating parameters, calculating intermediate coefficients in real time, power reconstruction, calculating safety parameters, and outputting protection alarm signals.

[0057] The data indexing relationship establishment includes: processing the numerical values ​​of the combination of running status parameters into indexable keys according to certain rules, and establishing a corresponding relationship between the keys and intermediate coefficient data paths.

[0058] The intermediate coefficients are sourced from an intermediate coefficient library;

[0059] The actual measurement and indexing of operating parameters specifically includes: determining the validity of the values ​​of the operating status parameters measured in real time, calculating the upper and lower bound values ​​of the corresponding preset key operating status parameters; and reading and recording the key values ​​and corresponding intermediate coefficients in the intermediate coefficient library that enclose the upper and lower bounds of the operating status parameters measured in real time.

[0060] The real-time intermediate coefficient calculation specifically includes: based on the currently measured operating status parameters and the intermediate coefficients corresponding to the upper and lower bounds of the currently measured operating status parameters, using numerical calculation methods such as interpolation or fitting, to calculate the intermediate coefficients corresponding to the current measured data in real time.

[0061] Power reconfiguration specifically includes: calculating the core power using intermediate coefficients of the current measured data, real-time measured operating status parameters, and self-powered neutron detector current data;

[0062] The safety parameter calculation specifically includes: calculating the safety parameters based on the reconfigured core power, comparing them with the preset protection limits, and determining the current core operation safety margin;

[0063] The protection alarm signal output specifically includes: determining whether to output a protection alarm signal based on the current core safety margin.

[0064] The fine-grained tracking calculation module also includes the following functions:

[0065] The numerical values ​​of the combination of running status parameters are processed into easy-to-index key values ​​according to certain rules, a corresponding relationship is established with the intermediate coefficient data path that matches them, and the processed index relationship is passed to the fast protection calculation module.

[0066] In this case, the fast protection calculation module reads the data index relationship provided by the fine tracking module, which is used to establish the data index relationship in the lower unit, and then performs actual operation parameter verification and indexing, real-time intermediate coefficient calculation, power reconstruction, safety parameter calculation and protection alarm signal output.

[0067] An embodiment of the present invention discloses an online monitoring and online protection calculation method applicable to large pressurized water reactor cores, comprising the following steps:

[0068] Step S1: Based on the range of key operating state parameters of the reactor core, select typical combinations of operating state parameters, including states that may occur during actual operation;

[0069] The key operating status parameters of the reactor core include, but are not limited to, the position of the control rod assembly, the power level, and the inlet and outlet temperatures of the coolant.

[0070] Step S2: Receive real-time measurement data of operating status parameters, calculate multiple sets of intermediate coefficients based on the selected combination of operating status parameters and the core state at the current time t0, form an intermediate coefficient library containing multiple sets of intermediate coefficients, and then pass the formed intermediate coefficient library to the lower unit for fast protection calculation.

[0071] The process of forming the intermediate coefficient library is triggered within a default periodic interval Δt0, or by manual triggering by the user; the default periodic interval Δt0 does not exceed 7 days.

[0072] Meanwhile, based on the current real-time measured operating status parameters and the core state at the current time t1, a set of intermediate coefficients is calculated, and after the calculation is completed, the set of intermediate parameters is used for rapid monitoring calculation.

[0073] If the actual operating status changes and exceeds the set limits, intermediate coefficient calculation needs to be initiated. This execution time is the time it takes for the corresponding change to occur, with a lower limit of 1 minute and an upper limit of approximately 30 minutes. The actual operating status changes refer to variations in power level, control rod position, core operating time, etc.

[0074] The values ​​of t0 and t1 can be equal or unequal.

[0075] Rapid monitoring and calculation: A numerical algorithm is established to correlate the self-sufficient neutron detector current with the power distribution of fuel assemblies within the reactor core. Intermediate coefficients provided by the fine-tracking calculation module are read, and the overall reactor core LPD and DNBR distributions are calculated based on the self-sufficient neutron detector current. These are compared with preset monitoring limits to determine the current core operating safety margin and to decide whether to output a monitoring alarm signal. Rapid monitoring and calculation relies on a rapid monitoring and calculation module deployed in the upper-level unit to perform real-time calculations of key parameters and monitoring safety margins, and to determine whether to generate a monitoring alarm signal.

[0076] Rapid protection calculation: A numerical algorithm is established to correlate the current of the self-powered neutron detector with the power distribution of fuel assemblies within the reactor core. It reads the data index relationships and intermediate coefficient library provided by the fine-tracking calculation module, verifies and indexes measured operating parameters, calculates intermediate coefficients in real time, and calculates the entire reactor core's LPD and DNBR distributions based on the detector current. These are compared with preset protection limits to determine the current core operating safety margin and whether to output a protection alarm signal. Rapid protection calculation relies on the rapid protection calculation module deployed in the lower-level unit to achieve real-time calculation of key parameters and protection safety margins, and to determine whether to generate a protection alarm signal.

[0077] The differences between rapid monitoring calculation and rapid protection calculation are reflected in:

[0078] 1. The modules and deployment units for implementing the functions are different;

[0079] 2. The intermediate coefficients read by the rapid monitoring calculation are updated in real time by the fine tracking calculation module; the intermediate coefficient library read by the rapid protection calculation is updated periodically or on demand by the fine tracking calculation module. It is necessary to interpolate or fit the core state parameters to generate intermediate coefficients for subsequent key parameter calculations based on the index relationship provided by the fine tracking calculation module.

[0080] 3. Monitoring thresholds and protection thresholds differ. For LPD core safety operation, the maximum value is the concern, and the alarm threshold for fast monitoring is lower than that for fast protection. For DNBR, the minimum value is the concern, and the alarm threshold for fast monitoring is higher than that for fast protection.

[0081] The rapid protection calculation includes: establishing data index relationships, verifying and indexing measured operating parameters, calculating intermediate coefficients in real time, power reconstruction, calculating safety parameters, and outputting protection alarm signals;

[0082] Specifically,

[0083] The data indexing relationship establishment includes: processing the numerical values ​​of the combination of running status parameters into indexable keys according to certain rules, and establishing the correspondence between intermediate coefficient data paths for threshold matching.

[0084] The intermediate coefficients are sourced from an intermediate coefficient library;

[0085] The actual operation parameter verification and indexing specifically includes: determining the validity of the current real-time measured operation status parameter values, calculating the upper and lower bound values ​​of the corresponding preset key operation status parameters; reading and recording the key values ​​and corresponding intermediate coefficients in the intermediate coefficient library that enclose the upper and lower bounds of the current real-time measured operation status parameters, based on the index relationship; that is: finding two sets of intermediate coefficients in the intermediate coefficient library that correspond to the upper and lower bounds of the actual operation status parameters according to the state parameters during core operation.

[0086] When indexing based on the index relationship, the upper and lower bound values ​​of the preset key operating parameter combination corresponding to the operating parameters closest to the current time are selected to calculate the intermediate coefficient corresponding to the current core state.

[0087] The real-time intermediate coefficient calculation specifically includes: based on the currently measured operating status parameters and the intermediate coefficients corresponding to the upper and lower bounds of the currently measured operating status parameters, using numerical calculation methods such as interpolation or fitting, to calculate the intermediate coefficients corresponding to the current measured data in real time.

[0088] Power reconfiguration specifically includes: calculating the core power using intermediate coefficients of the current measured data, real-time measured operating status parameters, and self-powered neutron detector current data; this calculation can be performed independently on multiple hardware units;

[0089] The safety parameter calculation specifically includes: calculating the safety parameters based on the reconfigured core power, comparing them with the preset protection limits, and determining the current core operation safety margin;

[0090] The protection alarm signal output specifically includes: determining whether to output a protection alarm signal based on the current core safety margin.

[0091] The rapid monitoring calculation includes: power reconstruction, safety parameter calculation, and determination of monitoring alarm signal output.

[0092] The power reconfiguration specifically includes: calculating the core power using a set of intermediate coefficients, real-time measured operating status parameters, and self-powered neutron detector current data;

[0093] The safety parameter calculation specifically includes: calculating the safety parameters based on the reconfigured core power, comparing them with preset monitoring limits, and determining the current core operation safety margin;

[0094] The specific steps for determining whether to output a monitoring alarm signal include: based on the current core safety margin, determining whether to output a monitoring signal.

[0095] To further understand the present invention, the online monitoring and online protection calculation method and system for large pressurized water reactor cores provided by the present invention will be described in detail below with reference to the embodiments. The scope of protection of the present invention is not limited by the following embodiments.

[0096] Example 1

[0097] Step S1: Based on the range of key operating state parameters of the reactor core, select typical combinations of operating state parameters, including states that may occur during actual operation;

[0098] The key operating parameters of the reactor core include the position of the control rod assembly, power level, and coolant inlet and outlet temperatures.

[0099] The measurement system collects operating status parameters in real time;

[0100] Step S2: The fine tracking calculation module calculates a set of intermediate coefficients based on the selected combination of operating status parameters and the core state at the current time t1. After the calculation is completed, the intermediate parameters are used and then passed to the fast monitoring calculation module.

[0101] The rapid monitoring and calculation module receives a set of intermediate parameters from the fine tracking and calculation module, real-time measured operating status parameters, and self-powered neutron detector current data, and calculates the core power.

[0102] Based on the reconfigured core power, calculate the safety parameters and compare them with the preset monitoring limits to determine the current core operation safety margin;

[0103] Based on the current core safety margin, determine whether to output a monitoring alarm signal.

[0104] Meanwhile, the fine tracking calculation module calculates multiple sets of intermediate coefficients based on the current real-time measured operating status parameters and the core state at the current time t0, forming an intermediate coefficient library containing multiple sets of intermediate coefficients, and then passes the formed intermediate coefficient library to the fast protection calculation module of the lower unit.

[0105] like Figure 2 As shown, the fast protection calculation module receives the formed intermediate database.

[0106] The numerical values ​​of the combined running status parameters are processed into easily indexable key values ​​according to certain rules, and a corresponding relationship is established with the intermediate coefficient data paths that match them.

[0107] The intermediate coefficients are sourced from an intermediate coefficient library;

[0108] Determine the validity of the current real-time measured operating status parameter values, and calculate the upper and lower bound values ​​of the corresponding preset key operating status parameters; based on the index relationship, read and record the key values ​​and corresponding intermediate coefficients in the intermediate coefficient library that enclose the upper and lower bounds of the current real-time measured operating status parameters.

[0109] Based on the typical operating state parameters measured in real time and the intermediate coefficients corresponding to the upper and lower bounds of the operating state parameters measured in real time, the intermediate coefficients corresponding to the current measured data are calculated in real time using numerical calculation methods such as interpolation or fitting.

[0110] The core power is calculated using intermediate coefficients of the current measured data, real-time measured operating status parameters, and self-powered neutron detector current data.

[0111] Based on the reconfigured core power, calculate the safety parameters and compare them with the preset protection limits to determine the current core operation safety margin;

[0112] Based on the current core safety margin, determine whether to output a protection alarm signal.

[0113] Example 2

[0114] Step S1: Based on the range of key operating state parameters of the reactor core, select typical combinations of operating state parameters, including states that may occur during actual operation;

[0115] The key operating parameters of the reactor core include the position of the control rod assembly, power level, and coolant inlet and outlet temperatures.

[0116] The measurement system collects operating status parameters in real time;

[0117] Step S2: The fine tracking calculation module calculates a set of intermediate coefficients based on the selected combination of operating status parameters and the core state at the current time t1. After the calculation is completed, the intermediate parameters are used and then passed to the fast monitoring calculation module.

[0118] The rapid monitoring and calculation module receives a set of intermediate parameters from the fine tracking and calculation module, real-time measured operating status parameters, and self-powered neutron detector current data, and calculates the core power.

[0119] Based on the reconfigured core power, calculate the safety parameters and compare them with the preset monitoring limits to determine the current core operation safety margin;

[0120] Based on the current core safety margin, determine whether to output a monitoring alarm signal.

[0121] Meanwhile, the fine tracking calculation module calculates multiple sets of intermediate coefficients based on the self-powered neutron detector (SPND) signal and the current real-time measured operating status parameters, based on the core state at the current time t0, forming an intermediate coefficient library containing multiple sets of intermediate coefficients, and then passes the formed intermediate coefficient library to the fast protection calculation module of the lower unit.

[0122] The numerical values ​​of the combination of running status parameters are processed into easy-to-index key values ​​according to certain rules, the correspondence of intermediate coefficient data paths for threshold matching is established, and the processed index relationship is passed to the fast protection calculation module.

[0123] The fast protection calculation module reads the data index relationship provided by the fine tracking module, which is used to establish the data index relationship in the lower unit, and also receives the formed intermediate database;

[0124] Determine the validity of the current real-time measured operating status parameter values, and calculate the upper and lower bound values ​​of the corresponding preset key operating status parameters; based on the index relationship, read and record the key values ​​and corresponding intermediate coefficients in the intermediate coefficient library that enclose the upper and lower bounds of the current real-time measured operating status parameters.

[0125] Based on the typical operating state parameters measured in real time and the intermediate coefficients corresponding to the upper and lower bounds of the operating state parameters measured in real time, the intermediate coefficients corresponding to the current measured data are calculated in real time using numerical calculation methods such as interpolation or fitting.

[0126] The core power is calculated using intermediate coefficients of the current measured data, real-time measured operating status parameters, and self-powered neutron detector current data.

[0127] Based on the reconfigured core power, calculate the safety parameters and compare them with preset limits to determine the current core operation safety margin;

[0128] Based on the current core safety margin, determine whether to output a protection alarm signal.

[0129] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0130] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for online monitoring and online protection calculation applicable to large pressurized water reactor cores, characterized in that, Includes the following steps: Step S1: Based on the range of key operating state parameters of the reactor core, select typical combinations of operating state parameters, including states that may occur during actual operation; Step S2: Receive real-time measurement data of operating status parameters, calculate multiple sets of intermediate coefficients based on the selected combination of operating status parameters and the core state at the current time t0, form an intermediate coefficient library containing multiple sets of intermediate coefficients, and then pass the formed intermediate coefficient library to the lower unit for fast protection calculation. Simultaneously, based on the current real-time measured operating status parameters and the core state at the current time t1, a set of intermediate coefficients is calculated. After the calculation is completed, the set of intermediate parameters is used for rapid monitoring calculation.

2. The online monitoring and online protection calculation method for large pressurized water reactor cores according to claim 1, characterized in that, In step S1, the key operating parameters of the reactor core are the position of the control rod group, the power level, and the inlet and outlet temperatures of the coolant.

3. The online monitoring and online protection calculation method for large pressurized water reactor cores according to claim 1, characterized in that, The rapid protection calculation includes: establishing data index relationships, verifying and indexing measured operating parameters, calculating intermediate coefficients in real time, power reconstruction, calculating safety parameters, and outputting protection alarm signals.

4. The online monitoring and online protection calculation method for large pressurized water reactor cores according to claim 3, characterized in that, The establishment of the data index relationship includes: processing the numerical values ​​of the combination of running status parameters into indexable key values ​​according to rules, and establishing the correspondence between intermediate coefficient data paths for threshold matching. The intermediate coefficients are sourced from an intermediate coefficient library; The actual measurement and indexing of operating parameters specifically includes: determining the legality of the values ​​of the operating status parameters measured in real time, calculating the upper and lower bound values ​​of the corresponding preset key operating status parameters; and reading and recording the key values ​​and corresponding intermediate coefficients in the intermediate coefficient library that enclose the upper and lower bounds of the operating status parameters measured in real time, based on the index relationship. The real-time intermediate coefficient calculation specifically includes: based on the currently measured operating status parameters and the intermediate coefficients corresponding to the upper and lower bounds of the currently measured operating status parameters, using interpolation or fitting numerical calculation methods to calculate the intermediate coefficients corresponding to the current measured data in real time. Power reconfiguration specifically includes: calculating the core power using intermediate coefficients of the current measured data, real-time measured operating status parameters, and self-powered neutron detector current data; The safety parameter calculation specifically includes: calculating the safety parameters based on the reconfigured core power, comparing them with the preset protection limits, and determining the current core operation safety margin; The protection alarm signal output specifically includes: determining whether to output a protection alarm signal based on the current core safety margin.

5. The online monitoring and online protection calculation method for large pressurized water reactor cores according to claim 1, characterized in that, The rapid monitoring calculation includes: power reconstruction, safety parameter calculation, and determination of monitoring alarm signal output.

6. The online monitoring and online protection calculation method for large pressurized water reactor cores according to claim 5, characterized in that, The power reconfiguration specifically includes: calculating the core power using a set of intermediate coefficients, real-time measured operating status parameters, and self-powered neutron detector current data; The safety parameter calculation specifically includes: calculating the safety parameters based on the reconfigured core power, comparing them with preset monitoring limits, and determining the current core operation safety margin; The determination of monitoring alarm signal output specifically includes: determining whether to output a monitoring signal based on the current core safety margin.

7. The online monitoring and online protection calculation method for large pressurized water reactor cores according to claim 1, characterized in that, The process of forming the intermediate coefficient library is triggered within a default periodic interval Δt0, or by manual triggering by the user; the default periodic interval Δt0 does not exceed 7 days. Based on the current real-time measured operating status parameters and the core state at the current time t1, when calculating a set of intermediate coefficients, if the actual operating status changes and exceeds the set limit, the intermediate coefficient calculation needs to be started. This execution time is the time when the corresponding change occurs, with a lower limit of 1 minute and an upper limit of 30 minutes.

8. An online monitoring and online protection calculation system suitable for large pressurized water reactor cores, characterized in that, include: Measurement system, upper-level unit and lower-level unit; The measurement system is used to measure key operating status parameters of the reactor core in real time; The key operating parameters of the reactor core measured by the reactor core are transmitted to the upper and lower units respectively. The upper-layer unit includes a fine-tracking calculation module and a fast-monitoring calculation module; The fine tracking calculation module includes two independent calculation routes: one is to calculate a set of intermediate coefficients and pass them to the fast monitoring calculation module; the other is to calculate multiple sets of intermediate coefficients to form an intermediate database, and then pass the intermediate database to the fast protection calculation module of the lower unit. The intermediate coefficient library stores multiple sets of intermediate coefficients calculated based on preset key operating state parameters. The lower-level unit includes a fast protection calculation module.

9. The online monitoring and online protection calculation system for large pressurized water reactor cores according to claim 8, characterized in that, The rapid monitoring and calculation module is used for power reconstruction, safety parameter calculation, and monitoring alarm signal output determination. The rapid protection calculation module is used for establishing data index relationships, verifying and indexing measured operating parameters, calculating intermediate coefficients in real time, power reconstruction, calculating safety parameters, and outputting protection alarm signals.

10. The online monitoring and online protection calculation system for large pressurized water reactor cores according to claim 8, characterized in that, The fine-tracking calculation module is used for power reconstruction, safety parameter calculation, and alarm signal output determination; it also includes the following functions: The numerical values ​​of the combination of running status parameters are processed into easy-to-index key values ​​according to certain rules, a corresponding relationship is established with the intermediate coefficient data path that matches them, and the processed index relationship is passed to the fast protection calculation module. The rapid protection calculation module reads the data index relationship provided by the fine tracking module, which is used to establish the data index relationship in the lower unit, verify and index the measured operating parameters, calculate the intermediate coefficient in real time, reconstruct the power, calculate the safety parameters and output the protection alarm signal.

11. The online monitoring and online protection calculation system for large pressurized water reactor cores according to claim 8, characterized in that, The measurement system is a reactor operation instrumentation and control system, and the input search condition is that the position of the control rod group is at the safety level.

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