Online protection method, system and readable storage medium for reactor

Abstract

The present invention relates to an on-line protection method, system and readable storage medium for a reactor. The on-line protection method for the reactor includes: obtaining n sets of detection data of a self-powered detector; taking m sets of different detection data from the n sets of detection data to form a subset, and respectively reconstructing the core power distribution data of the corresponding subset according to the detection data of each subset; respectively calculating the maximum LPD value and the minimum DNBR value corresponding to each subset according to the core power distribution data corresponding to each subset; selecting the final maximum LPD value from the maximum LPD values corresponding to each subset, and selecting the final minimum DNBR value from the minimum DNBR values corresponding to each subset; and judging whether to trigger a reactor trip signal according to the final maximum LPD value and the final minimum DNBR value, as well as a preset LPD setting value and a DNBR setting value. Through this technical solution, the accuracy of the values of the maximum LPD value and the minimum DNBR value is greatly improved, the calculation uncertainty can be reduced, and more safety margins can be obtained.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power design, and particularly to a reactor online protection method, system and readable storage medium. Background Art

[0002] To ensure the safety of the reactor, it is required in the design that the maximum heat flux density on the surface of the fuel assembly is less than the critical heat flux density, thus introducing the DNBR (Departure from Nucleate Boiling Ratio) protection. At the same time, to avoid excessive linear power density in the core, the LPD (Linear Power Density) protection is introduced.

[0003] The calculation of DNBR and LPD is related not only to the main pump speed, cold leg temperature, coolant pressure, but also to the core power distribution data. Moreover, the monitoring of the core power distribution is crucial for the safe operation of the reactor. Currently, in a pressurized water reactor, the core neutron flux is generally detected by self-powered detectors, and then combined with the monitoring data of the out-of-core nuclear instrumentation to periodically calculate the core power distribution. Moreover, when calculating the core power distribution information, usually the measurement data of each group of neutron detectors are preprocessed first, then the preprocessed data of each group are summarized, and finally the core power distribution is deduced based on the summarized data. However, in this method, if the measurement data of one or some neutron detectors have large errors, it will directly affect the accuracy of the core power distribution reconstruction calculation, and further affect the accuracy of the DNBR calculation value and the LPD calculation value, resulting in a small safety margin for nuclear power operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a reactor online protection method, system and readable storage medium for the defect of small safety margin in nuclear power operation existing in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is to construct a reactor online protection method, including:

[0006] Step S10. Obtain n groups of detection data of self-powered detectors, where n≥4;

[0007] Step S20. Take m groups of different detection data from the n groups of detection data to form a subset, and respectively reconstruct the core power distribution data of the corresponding subset according to the detection data of each subset, where m≥3 and m<n;

[0008] Step S30. Calculate the maximum LPD value and the minimum DNBR value corresponding to each subset according to the core power distribution data corresponding to each subset;

[0009] Step S40. Select the final maximum LPD from the maximum LPD values corresponding to each subset, and select the final minimum DNBR from the minimum DNBR values corresponding to each subset;

[0010] Step S50. Determine whether to trigger a reactor trip signal according to the final maximum LPD, the final minimum DNBR, a preset LPD set value, and a preset DNBR set value.

[0011] Preferably, n = 4, m = 3, and the number of subsets is four.

[0012] Preferably, in step S40, selecting the final maximum LPD from the maximum LPD values corresponding to each subset includes:

[0013] Select the second largest value from the maximum LPD values corresponding to each subset, and use the second largest value as the final maximum LPD.

[0014] Preferably, in step S40, selecting the final minimum DNBR from the minimum DNBR values corresponding to each subset includes:

[0015] Select the second smallest value from the minimum DNBR values corresponding to each subset, and use the second smallest value as the final minimum DNBR.

[0016] Preferably, step S50 includes:

[0017] Determine whether the final maximum LPD is greater than the preset LPD set value;

[0018] Determine whether the final minimum DNBR is less than the preset DNBR set value;

[0019] If the final maximum LPD is greater than the LPD set value, or the final minimum DNBR is less than the DNBR set value, then trigger a reactor trip signal.

[0020] The present invention also constructs a reactor on-line protection system, including:

[0021] A data acquisition module, configured to acquire n groups of detection data of self-powered detectors, where n ≥ 4;

[0022] A combination reconstruction module, configured to take m groups of different detection data from the n groups of detection data to form a subset, and respectively reconstruct the core power distribution data of the corresponding subset according to the detection data of each subset, where m ≥ 3 and m < n;

[0023] A value calculation module, configured to calculate the maximum LPD value and the minimum DNBR value corresponding to each subset respectively according to the core power distribution data corresponding to each subset;

[0024] A value selection module, configured to select the final maximum LPD value from the maximum LPD values corresponding to each subset, and select the final minimum DNBR value from the minimum DNBR values corresponding to each subset;

[0025] A judgment module, configured to judge whether to trigger a reactor trip signal according to the final maximum LPD value and the final minimum DNBR value, as well as a preset LPD setting value and a DNBR setting value.

[0026] Preferably, n = 4, m = 3, and the number of the subsets is four.

[0027] Preferably, the value selection module includes:

[0028] An LPD value selection unit, configured to select the second largest value from the maximum LPD values corresponding to each subset, and use the second largest value as the final maximum LPD value;

[0029] A DNBR value selection unit, configured to select the second smallest value from the minimum DNBR values corresponding to each subset, and use the second smallest value as the final minimum DNBR value.

[0030] The present invention also constructs a reactor on-line protection system, including a processor and a memory storing a computer program, and the processor implements the steps of the reactor on-line protection method described above when executing the computer program.

[0031] The present invention also constructs a readable storage medium, storing a computer program, and the computer program implements the steps of the reactor on-line protection method described above when being executed by a processor.

[0032] In the technical solution provided by the present invention, a large number of on-site detection data are used to reconstruct and calculate the core power distribution, that is, each group of detection data participates in multiple reconstruction calculations, and the reconstruction accuracy is high. Furthermore, various different on-site real-time maximum LPD values and minimum DNBR values can be obtained, greatly improving the value-taking accuracy of the on-site real-time maximum LPD value and the minimum DNBR value, being able to reduce the calculation uncertainty and obtain more safety margins. Description of the Drawings

[0033] To more clearly illustrate the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0034] Figure 1 is the flowchart of the first embodiment of the online protection method for the reactor of the present invention;

[0035] Figure 2 is the logical structure diagram of the first embodiment of the online protection system for the reactor of the present invention. Detailed implementation manners

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] Figure 1 is the flowchart of the first embodiment of the online protection method for the reactor of the present invention. The online protection method for the reactor in this embodiment is used for LPD and DNBR protection of the reactor, and specifically includes the following steps:

[0038] Step S10. Obtain n groups of detection data of the self-powered detector, where n≥4;

[0039] Step S20. Select m groups of different detection data from the n groups of detection data to form a subset, and respectively reconstruct the core power distribution data of the corresponding subset according to the detection data of each subset, where m≥3 and m < n;

[0040] Step S30. Calculate the maximum LPD value and the minimum DNBR value corresponding to each subset according to the core power distribution data corresponding to each subset;

[0041] Step S40. Select the final maximum LPD value from the maximum LPD values corresponding to each subset, and select the final minimum DNBR value from the minimum DNBR values corresponding to each subset;

[0042] Step S50. Determine whether to trigger a reactor trip signal according to the final maximum LPD value and the final minimum DNBR value, as well as the preset LPD setting value and DNBR setting value.

[0043] In this embodiment, first, by dividing the n groups of detection data into a subset, and respectively reconstruct the core power distribution data based on the detection data of each subset, so as to obtain different core power distribution data. Then, calculate according to the different core power distribution data to obtain different on-site real-time LPD maximum values and DNBR minimum values. Moreover, from LPD maximum values, determine the final LPD maximum value, and from DNBR minimum values, determine the final DNBR minimum value. Finally, according to the final LPD maximum value and the final DNBR minimum value, and combined with the LPD set value and the DNBR set value, judge whether to trigger the reactor trip signal. Therefore, the technical solution of this embodiment uses a large number of on-site detection data to reconstruct and calculate the core power distribution, that is, each group of detection data participates in multiple reconstruction calculations, with high reconstruction accuracy. Furthermore, multiple different on-site real-time LPD maximum values and DNBR minimum values can be obtained, greatly improving the accuracy of the on-site real-time LPD maximum value and DNBR minimum value, reducing the calculation uncertainty, and obtaining more safety margins.

[0044] In a specific embodiment, the core is, for example, a 177-core, 121-core, 157-core, 193-core, 241-core, and moreover, n = 4, m = 3, that is, the number of subsets is four. In this embodiment, a total of four groups of self-powered detectors are set. After preprocessing the detection data of the four groups of self-powered detectors respectively, combine these four groups of detection data according to 4 taking 3 to obtain 4-zone (subset) detection data, and each zone contains 3 groups of detection data. Then, based on the detection data of each zone, respectively reconstruct the core power distribution data, so as to obtain 4 different reconstructed full-core power distributions. Then, according to the different full-core power distributions, calculate 4 different on-site real-time LPD maximum values and DNBR minimum values.

[0045] Further, in a specific embodiment, step S30 includes:

[0046] Select the second-largest value from the LPD maximum values corresponding to each subset, and use the second-largest value as the final LPD maximum value;

[0047] Select the second-smallest value from the DNBR minimum values corresponding to each subset, and use the second-smallest value as the final DNBR minimum value.

[0048] In this embodiment, considering the safety analysis assumption of a single failure, the on-site real-time calculated values participating in the protection take the second-largest value of the 4-zone LPD and the second-smallest value of the 4-zone DNBR, and use the second-largest value of the 4-zone LPD / the second-smallest value of the 4-zone DNBR as the final LPD maximum value / the final DNBR minimum value.

[0049] Further, in a specific embodiment, step S50 includes:

[0050] Determine whether the maximum value of the final LPD is greater than the preset LPD set value;

[0051] Determine whether the minimum value of the final DNBR is less than the preset DNBR set value;

[0052] If the maximum value of the final LPD is greater than the LPD set value, or the minimum value of the final DNBR is less than the DNBR set value, a reactor trip signal is triggered.

[0053] In this embodiment, the second largest value of the LPD in Area 4 / the second smallest value of the DNBR in Area 4 is compared with the LPD / DNBR set value. If it exceeds or is lower than the corresponding set value, a reactor trip signal is triggered.

[0054] Figure 2 FIG. 18 is a logic structure diagram of the first embodiment of the reactor on-line protection system of the present invention. The reactor on-line protection system of this embodiment includes: a data acquisition module 10, a combination reconstruction module 20, a value calculation module 30, a value selection module 40, and a judgment module 50. Among them, the data acquisition module 10 is used to acquire n sets of detection data of self-powered detectors, where n≥4; the combination reconstruction module 20 is used to select m sets of different detection data from the n sets of detection data to form a subset, and respectively reconstruct the core power distribution data of the corresponding subset according to the detection data of each subset, where m≥3 and m<n; the value calculation module 30 is used to calculate the maximum value of the LPD and the minimum value of the DNBR corresponding to each subset respectively according to the core power distribution data corresponding to each subset; the value selection module 40 is used to select the final maximum value of the LPD from the maximum values of the LPD corresponding to each subset, and select the final minimum value of the DNBR from the minimum values of the DNBR corresponding to each subset; the judgment module 50 is used to judge whether to trigger a reactor trip signal according to the final maximum value of the LPD, the final minimum value of the DNBR, and the preset LPD set value and DNBR set value. The technical solution of this embodiment uses a large number of on-site detection data to reconstruct and calculate the core power distribution, that is, each set of detection data participates in multiple reconstruction calculations, with high reconstruction accuracy. Furthermore, various different on-site real-time maximum values of LPD and minimum values of DNBR can be obtained, greatly improving the accuracy of the on-site real-time maximum value of LPD and minimum value of DNBR, reducing the calculation uncertainty, and obtaining more safety margins.

[0055] In a specific embodiment, n = 4 and m = 3. That is, the number of subsets is four. This embodiment can be applied to 177-core, 121-core, 157-core, 193-core, 241-core, etc.

[0056] Further, in a specific embodiment, the value selection module 40 includes an LPD value selection unit and a DNBR value selection unit. Among them, the LPD value selection unit is configured to select the second largest value from the LPD maximum values corresponding to each subset, and use the second largest value as the final LPD maximum value; the DNBR value selection unit is configured to select the second smallest value from the DNBR minimum values corresponding to each subset, and use the second smallest value as the final DNBR minimum value.

[0057] The present invention also constructs a reactor online protection system, which includes a processor and a memory. The memory stores a computer program, and when the processor executes the computer program, the steps of the reactor online protection method described above are implemented.

[0058] The present invention also constructs a readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the steps of the reactor online protection method described above are implemented.

[0059] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. An on-line protection method for a reactor, characterized in that, Including: Step S10. Obtain n groups of detection data of the self-powered detector, where n ≥ 4; Step S20. Take m different sets of detection data from the n sets of detection data to form a subset, and reconstruct the core power distribution data of the corresponding subset according to the detection data of the subsets respectively, where m≥3 and m<n; Step S30. According to the core power distribution data corresponding to the subsets, calculate the maximum LPD and the minimum DNBR corresponding to the Step S40. Select the final maximum LPD from the maximum LPDs corresponding to subsets, and select the final minimum DNBR from the minimum DNBRs corresponding to subsets; Step S50. Determine whether to trigger a reactor trip signal according to the final maximum LPD value, the final minimum DNBR value, and a preset LPD set value and DNBR set value.

2. The reactor online protection method according to claim 1, characterized in that, n = 4, m = 3, and the number of the subsets is four.

3. The reactor on-line protection method according to claim 1, characterized in that, In the step S40, from the maximum LPD values corresponding to the subsets, selecting the final maximum LPD value, including: Select from the second largest value among the maximum LPD values corresponding to the subsets, and use the second largest value as the final maximum LPD value.

4. The on-line protection method of the reactor according to claim 1, characterized in that In the step S40, from the minimum DNBR values corresponding to the subsets, select the final minimum DNBR value, including: Select from the second smallest value from the minimum values of DNBR corresponding to the subsets, and use the second smallest value as the final minimum value of DNBR.

5. The reactor online protection method according to claim 1, characterized in that, The step S50 includes: Determine whether the final maximum LPD value is greater than the preset LPD set value; Determine whether the final minimum DNBR value is less than the preset DNBR set value; If the final maximum LPD value is greater than the LPD set value, or the final minimum DNBR value is less than the DNBR set value, then trigger a reactor trip signal.

6. An on-line protection system for a reactor, characterized in that, Including: A data acquisition module, configured to obtain n groups of detection data of the self-powered detector, where n ≥ 4; A combined reconstruction module is used to select m different sets of detection data from n sets of detection data to form a subset, and respectively reconstruct the core power distribution data of the corresponding subsets according to the detection data of the subsets, where m≥3 and m<n; A value calculation module for calculating respectively the maximum value of LPD and the minimum value of DNBR corresponding to the subsets based on the core power distribution data corresponding to the subsets; A value selection module for selecting the final maximum LPD from the maximum LPDs corresponding to subsets, and for selecting the final minimum DNBR from the minimum DNBRs corresponding to subsets; A judgment module, configured to determine whether to trigger a reactor trip signal according to the final maximum LPD value, the final minimum DNBR value, and a preset LPD set value and DNBR set value.

7. The on-line protection system for a reactor according to claim 6, characterized in that n = 4, m = 3, and the number of the subsets is four.

8. The reactor on-line protection system according to claim 6, characterized in that, The value selection module includes: The LPD value selection unit is configured to select the second largest value from the maximum LPD values corresponding to subsets, and use the second largest value as the final maximum LPD value; The DNBR value selection unit is configured to select the second smallest value from the minimum DNBR values corresponding to subsets, and use the second smallest value as the final minimum DNBR value.

9. An on-line protection system for a reactor, comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the reactor online protection method according to any one of claims 1-5 are implemented.

10. A readable storage medium stores a computer program, characterized in that, When the computer program is executed by the processor, the steps of the reactor online protection method according to any one of claims 1-5 are implemented.

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