Nuclear instrument system source range alarm threshold adaptive adjustment method and system

Abstract

The invention relates to the technical field of nuclear power plant reactor nuclear measurement, in particular to a nuclear instrumentation system source range alarm threshold value self-adaptive adjustment method and system, and aims to realize alarm threshold value automatic adjustment of high neutron fluence rate alarm in source range shutdown by adopting the self-adaptive adjustment method suitable for the nuclear instrumentation system source range alarm threshold value. The whole process does not need human intervention, only the uplink and downlink modes need to be manually adjusted, the initial value of the setting value of the source range counting rate change rate is manually set, regular manual adjustment is needed, human intervention is not needed in the whole process during the whole loading and reactor power increasing or reactor power decreasing and unloading period, the labor cost can be greatly saved, and the working efficiency is improved. The human error risk is reduced; the method can greatly improve the adjustment efficiency of the alarm threshold value during the material loading (replacement) and power increase of the nuclear power plant, reduces the labor cost and human error risk in the adjustment process of the alarm threshold value, and releases the critical path during the material loading (replacement) and overhaul of the reactor.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear measurement of a nuclear power plant reactor, and in particular to a method and system for adaptively adjusting a source range alarm threshold of a nuclear instrument system. Background Art

[0002] The Reactor Nuclear Instrumentation System (RNI) realizes continuous monitoring of reactor power, power level changes and power distribution through a series of detectors for measuring neutron injection rate set outside the reactor pressure vessel. The reactor nuclear instrumentation system consists of a source range channel, an intermediate range channel and a power range channel. The three channels are used to realize the reactor core status monitoring under different operating conditions. The source range channel is used for monitoring the reactor core status during core loading (replacement), reactor startup and shutdown. The signal measured by the source range channel can provide a basis for the operator's operation. In order to meet the design criteria of the protection system, there are 4 RNI protection cabinets in total, which are a 4-redundancy design, and each protection cabinet is independent of each other.

[0003] The source range channel provides a continuous visual count rate indication to the main control room, provides audio prompts in the main control room and reactor building, and provides an audio alarm in the reactor building. The source range shutdown neutron injection rate high alarm is set in the power plant computer information and control system (IIC) and the main control room backup panel (BUP), and an alarm box speaker is set on the reactor building refueling platform. This alarm is an important means to monitor the core reactivity status during loading (refueling) and during reactor startup. It is used to inform nuclear facility operators of unexpected changes in core reactivity, prompt operators to adjust the control rod insertion depth and boron concentration to control core reactivity, and remind personnel to evacuate as soon as possible through an audio alarm in the reactor building.

[0004] The alarm threshold setting range of the source range shutdown neutron injection rate high alarm is 2Φ~5Φ (Φ is the normal neutron injection rate during shutdown), and the alarm threshold is usually set to 3Φ. Since the reference value Φ changes continuously during the reactor loading (refueling) and startup and shutdown, it is necessary to dynamically adjust the alarm threshold multiple times to ensure the safety of the reactor and personnel on the one hand, and to ensure that the reactor can successfully complete the loading (refueling) and startup and shutdown on the other hand.

[0005] At present, the alarm threshold adjustment method for the source range shutdown neutron injection rate high alarm is manually controlled. The operator or physical personnel notifies the instrumentation and control personnel to enter the site to cooperate in adjusting the alarm threshold according to the operating status and the current source range count rate value. The adjustment steps are as follows:

[0006] 1. The operator or physical personnel manually determines the difference between the current counting rate and the 3Φ fixed value to confirm whether the fixed value adjustment needs to be performed;

[0007] 2. The instrument control personnel obtains the operation ticket, puts one of the RN I protection cabinets into the test state, and bypasses the protection signal of the cabinet in this channel;

[0008] 3. Use a dedicated maintenance unit to connect to the RNI protection cabinet to modify the alarm threshold parameters;

[0009] 4. After confirming that the threshold value modification is correct, disconnect the protection cabinet and the dedicated maintenance unit;

[0010] 5. Confirm that the RN I protection cabinet is in normal condition, cancel the test state of the cabinet, and restore the bypass;

[0011] 6. Follow the above steps 1 to 5 one by one to modify the set values ​​of the remaining three RN I protection cabinets.

[0012] Since the entire alarm threshold setting operation is relatively complicated, and the alarm threshold needs to be adjusted multiple times during material loading (replacement) and power increase, the more frequent alarm threshold modification leads to long-term occupation of the critical path, delaying the material loading (replacement) and overhaul period, and greatly increasing labor costs and the risk of human errors. Summary of the invention

[0013] The purpose of the present invention is to provide a method and system for adaptively adjusting the source range alarm threshold of a nuclear instrument system to solve the above-mentioned problems in the prior art.

[0014] The present invention is achieved through the following technical solutions:

[0015] In a first aspect, the present invention provides a method for adaptively adjusting a source range alarm threshold of a nuclear instrument system, comprising:

[0016] Set the source range count rate threshold, the first source range count rate change rate, the second source range count rate change rate, and the third source range count rate change rate;

[0017] Get the current source range count rate, and get the current source range count rate change rate through the current source range count rate;

[0018] Acquiring the current reactor state, wherein the reactor state includes a period of loading and reactor power state increase and a period of reactor power decrease and unloading;

[0019] A first comparison result is obtained based on a comparison between the source range count rate and the source range count rate threshold value in combination with the current reactor state, and a source range count rate change rate is selected based on the first comparison result to compare with the first source range count rate change rate or the second source range count rate change rate or the third source range count rate change rate to obtain a second comparison result;

[0020] The current core reactivity state is outputted through the second comparison result.

[0021] Preferably, the outputting of the current core reactivity state comprises:

[0022] If the current reactor state is during the reactor power state enhancement period, and the source range count rate is less than the source range count rate threshold, then the source range count rate change rate is selected to be compared with the first source range count rate change rate;

[0023] If the source range count rate change rate is less than the first source range count rate change rate, then the core reactivity state of the current core fuel loading is output to be normal;

[0024] If the source range count rate change rate is greater than or equal to the first source range count rate change rate, then the core reactivity state of the current core fuel loading is output as abnormal.

[0025] Preferably, it also includes:

[0026] If the current reactor state is during the reactor power state enhancement period, and the source range count rate is greater than or equal to the source range count rate threshold, then the source range count rate change rate is selected to be compared with the second source range count rate change rate;

[0027] If the source range count rate change rate is less than the second source range count rate change rate, then the core reactivity state of the current core fuel loading is output to be normal;

[0028] If the source range count rate change rate is greater than or equal to the second source range count rate change rate, then the core reactivity state of the current core fuel loading is output as abnormal.

[0029] Preferably, the outputting of the current core reactivity state comprises:

[0030] If the current reactor state is during reactor power reduction and unloading, and the source range count rate is less than the source range count rate threshold, then the source range count rate change rate is selected for comparison with the first source range count rate change rate;

[0031] If the source range count rate change rate is less than the first source range count rate change rate, then the core reactivity state of the current core fuel loading is output to be normal;

[0032] If the source range count rate change rate is greater than or equal to the first source range count rate change rate, then the core reactivity state of the current core fuel loading is output as abnormal.

[0033] Preferably, it also includes:

[0034] If the current reactor state is during reactor power reduction and unloading, and the source range count rate is greater than or equal to the source range count rate threshold, then the source range count rate change rate is selected for comparison with the third source range count rate change rate;

[0035] If the source range count rate change rate is less than the third source range count rate change rate, then the core reactivity state of the current core fuel loading is output to be normal;

[0036] If the source range count rate change rate is greater than or equal to the third source range count rate change rate, then the core reactivity state of the current core fuel loading is output as abnormal.

[0037] Preferably, it also includes:

[0038] Sending source range count rate and source range count rate change rate signals to a processing unit via a network;

[0039] The processing unit sends the source range count rate signal and the source range count rate change rate signal to the non-safety level DCS through the network, and the above-mentioned nuclear instrument system source range alarm threshold adaptive adjustment method is set on the non-safety level DCS side;

[0040] The abnormal core reactivity status signal of the current core fuel loading is sent to the alarm box speaker of the reactor building and the main control room respectively.

[0041] Preferably, the processing unit is an RN I control cabinet.

[0042] In a second aspect, the present invention further provides a nuclear instrument system source range alarm threshold adaptive adjustment system, comprising:

[0043] The source range count rate change rate calculation module is configured in the RN I protection cabinet to realize the conditioning and processing of the source range neutron detector signal, and has the source range count rate calculation function, the source range count rate change rate calculation function, the source range count rate output function, and the source range count rate change rate output function, and can output the source range count rate signal and the source range count rate change rate signal to the RN I control cabinet processing unit;

[0044] The core reactivity state judgment module is configured in a non-safety-level DCS platform, sets a source range count rate threshold, a first source range count rate change rate, a second source range count rate change rate and a third source range count rate change rate; obtains the current source range count rate and count rate change rate signal; obtains the current reactor state, the reactor state includes the period of loading and reactor power state improvement and the period of reactor power reduction and unloading; obtains a first comparison result based on the comparison between the source range count rate and the source range count rate threshold combined with the current reactor state, selects the source range count rate change rate to compare with the first source range count rate change rate or the second source range count rate change rate or the third source range count rate change rate through the first comparison result, obtains a second comparison result, and outputs the current core reactivity state through the second comparison result.

[0045] The main control room display and control module is configured in the main control room and connected to the core reactivity state judgment module, and is used to obtain the current source range count rate signal, the source range count rate change rate signal, the source range count rate threshold, the first source range count rate change rate, the second source range count rate change rate, the third source range count rate change rate, and display them in real time; it is used to set the source range count rate threshold, the first source range count rate change rate, the second source range count rate change rate, the third source range count rate change rate and set the current reactor state, and transmit them to the core reactivity state judgment module for reactivity state judgment.

[0046] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0047] 1. By adopting an adaptive adjustment method suitable for the source range alarm threshold of the nuclear instrument system, the alarm threshold of the source range shutdown neutron injection rate high alarm is automatically adjusted. The whole process does not require human intervention. It only requires manual adjustment of the up and down modes, manual setting of the initial value of the source range count rate change rate setting value and regular manual adjustment. During the entire loading and reactor power increase or reactor power reduction and unloading period, no human intervention is required, which can greatly save labor costs and reduce the risk of human errors. It can greatly improve the efficiency of alarm threshold adjustment during nuclear power plant loading (replacement) and power increase, reduce labor costs and human error risks during the alarm threshold adjustment process, and release the critical path during reactor loading (replacement) and overhaul.

[0048] 2. There is no need to go to the RN I protection cabinet, and there is no need to use a dedicated computer to connect to the RN I protection cabinet to frequently modify the threshold parameters. The present invention can realize adaptive adjustment of the alarm threshold, greatly improve the efficiency of alarm threshold adjustment, and release the critical path during reactor loading (replacement) and overhaul;

[0049] 3. The current source range count rate, source range count rate change rate, and source range count rate change rate setting value settings are updated in real time on the display interface in the main control room, providing operators with an interface for emergency operations to avoid the risk of adjusting the alarm threshold too high or too low, and avoid the occurrence of false alarm events. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 It is a logic flow chart of the source range alarm threshold adaptive adjustment method of the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0053] The terms "first, second" and the like in the specification and claims of this application and the above drawings 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 mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The named or numbered process steps can be changed in the execution order according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0054] The modules or submodules described independently may be physically separated or not: they may be implemented by software or hardware, and some modules or submodules may be implemented by software, and the processor may call the software to implement the functions of these modules or submodules, and other modules or submodules may be implemented by hardware, such as by hardware circuits. In addition, some or all of the modules may be selected according to actual needs to achieve the purpose of the present application.

[0055] Please refer to Figure 1 The present invention provides a method for adaptively adjusting a source range alarm threshold of a nuclear instrument system, comprising:

[0056] S101: Setting a source range count rate threshold, a first source range count rate change rate, a second source range count rate change rate, and a third source range count rate change rate;

[0057] S102: Obtain the current source range count rate, and obtain the current source range count rate change rate through the current source range count rate;

[0058] S103: Acquire the current reactor state, where the reactor state includes a period of loading and reactor power state increase and a period of reactor power decrease and unloading;

[0059] S104: obtaining a first comparison result based on a comparison between the source range count rate and the source range count rate threshold value in combination with the current reactor state, and selecting the source range count rate change rate to compare with the first source range count rate change rate, the second source range count rate change rate, or the third source range count rate change rate based on the first comparison result to obtain a second comparison result;

[0060] S105: Output the current core reactivity state based on the second comparison result.

[0061] In the present invention, during the reactor loading (replacement) process, as the primary neutron source S1 moves, the secondary neutron source S2 moves, and the fuel assembly is loaded, the source range neutron count rate will slowly rise; in the power boosting stage, as the rod lifting or the main pump operates to increase the temperature of the primary circuit, the source range neutron count rate will also slowly rise; when the reactor reaches criticality, the source range shutdown neutron injection rate high alarm can be locked in the main control room according to the operator's needs. In the above process, the source range count rate change rate △Φ is positively correlated with the effective value-added factor Keff, and the source range count rate change rate △Φ is used as a basis for judging whether the neutron injection rate level in the reactor building and the core reactivity have changed abnormally.

[0062] Figure 1 It should be noted that the unit up mode corresponds to the period when the reactor state of this scheme is loading and the reactor power state is increased, and the unit down mode corresponds to the period when the reactor state of this scheme is decreasing and the reactor power is unloading.

[0063] In the initial state before loading, since the fuel assembly and neutron source assembly have not yet started to be loaded, the neutron injection rate level is the background level, and the count rate Φ output by the source range channel is very low. When the fuel assembly and neutron source assembly start to be loaded, the source range count rate will change significantly. During this period, the source range count rate change rate setting value can be relatively conservative, and the larger value of the first source range count rate change rate △Φ1 is taken. After loading begins, when the source range count rate Φ reaches the source range count rate threshold Φ k When (usually Φ k Set to 0.5cps), indicating that the source range channel has entered the normal monitoring interval. The source range count rate change rate can reflect the change in core reactivity, including the state from loading to the completion of the movement of the primary neutron source S1, the completion of the movement of the primary neutron source S2, and the completion of the core loading until the critical state. The source range count rate changes slowly. During this period, the source range count rate change rate setting value is based on the actual situation, and the second source range count rate change rate △Φ2 is taken. The source range count rate change rate setting values ​​△Φ1 and △Φ2 are parameters that are regularly determined during the initial power plant startup and the entire power plant life thereafter.

[0064] After the reactor power drops to the power level at which the source range channel can be put into operation, the source range channel is put into operation. At this time, the source range count rate is relatively high and is within the effective monitoring range. The source range count rate change rate can reflect the changes in core reactivity. During the power reduction stage, the source range count rate change rate should theoretically be a negative number. To prevent accidental boron dilution events, the third source range count rate change rate △Φ3 (an appropriate positive number) can be taken. During the unloading period, when the source range count rate is less than Φ k When (usually Φ k The third source range count rate change rate △Φ3 is a parameter that is determined periodically during the initial power plant startup and throughout the power plant life.

[0065] In an exemplary embodiment of the present invention, the outputting of the current core reactivity state comprises:

[0066] If the current reactor state is during the reactor power state increase period, and the source range count rate Φ is less than the source range count rate threshold Φ k , then the source range count rate change rate △Φ is selected to be compared with the first source range count rate change rate △Φ1;

[0067] If the source range count rate change rate △Φ is less than the first source range count rate change rate △Φ1, then the core reactivity state of the current core fuel loading is output to be normal, indicating that the core fuel loading is normal;

[0068] If the source range count rate change rate △Φ is greater than or equal to the first source range count rate change rate △Φ1, the core reactivity state of the current core fuel loading is output as abnormal, and the source range shutdown neutron injection rate high alarm is about to be triggered, reminding the operator of the abnormal change in core reactivity and the possibility of unexpected boron dilution event, reminding the operator to manually isolate the non-boronated water source in time and prevent boron dilution before losing the shutdown margin.

[0069] An exemplary embodiment of the present invention further includes:

[0070] If the current reactor state is during the reactor power state increase period, and the source range count rate Φ is greater than or equal to the source range count rate threshold Φ k , then the source range count rate change rate △Φ is selected to be compared with the second source range count rate change rate △Φ2;

[0071] If the source range count rate change rate △Φ is less than the second source range count rate change rate △Φ2, then the core reactivity state of the current core fuel loading is output to be normal;

[0072] If the source range count rate change rate △Φ is greater than or equal to the second source range count rate change rate △Φ2, then the core reactivity state of the current core fuel loading is output as abnormal.

[0073] In an exemplary embodiment of the present invention, the outputting of the current core reactivity state comprises:

[0074] If the current reactor state is during reactor power reduction and unloading, and the source range count rate Φ is less than the source range count rate threshold Φ k , then the source range count rate change rate △Φ is selected to be compared with the first source range count rate change rate △Φ1;

[0075] If the source range count rate change rate △Φ is less than the first source range count rate change rate △Φ1, then the core reactivity state of the current core fuel loading is output to be normal;

[0076] If the source range count rate change rate △Φ is greater than or equal to the first source range count rate change rate △Φ1, then the core reactivity state of the current core fuel loading is output as abnormal.

[0077] An exemplary embodiment of the present invention further includes:

[0078] If the current reactor status is during reactor power reduction and unloading, and the source range count rate Φ is greater than or equal to the source range count rate threshold Φ k , then the source range count rate change rate △Φ is selected to be compared with the third source range count rate change rate △Φ3;

[0079] If the source range count rate change rate △Φ is less than the third source range count rate change rate △Φ3, then the core reactivity state of the current core fuel loading is output to be normal;

[0080] If the source range count rate change rate △Φ is greater than or equal to the third source range count rate change rate △Φ3, then the core reactivity state of the current core fuel loading is output as abnormal.

[0081] An exemplary embodiment of the present invention further includes:

[0082] Sending source range count rate and source range count rate change rate signals to a processing unit via a network;

[0083] The processing unit sends the source range count rate signal and the source range count rate change rate signal to the non-safety level DCS through the network, and the above-mentioned nuclear instrument system source range alarm threshold adaptive adjustment method is set on the non-safety level DCS side;

[0084] The abnormal state signal of the core reactivity of the current core fuel loading is sent to the alarm box speaker of the reactor building and the main control room respectively. The processing unit is the RN I control cabinet.

[0085] In this embodiment, in order to realize the calculation of the source range count rate change rate, a source range count rate change rate calculation module is added on the source range processing chassis side of the RN I protection cabinet, and the source range count rate and source range count rate change rate signals are sent to the RN I control cabinet through the network, and sent to the non-safety-level DCS through the RN I control cabinet through the network, and threshold setting, threshold comparison and threshold adaptive adjustment are performed on the non-safety-level DCS side. The non-safety-level DCS sends the alarm signal to the reactor plant alarm box speaker and the main control room through the switch output module, respectively, to trigger the reactor plant speaker sound alarm and the main control room speaker sound reminder. A source range count rate change rate main control room display and control module with screen display is set in the main control room to realize real-time display of the current source range count rate, source range count rate change rate, and source range count rate change rate setting value, realize manual setting of the source range count rate change rate setting value initial value and regular manual adjustment, and realize manual adjustment of the uplink and downlink modes.

[0086] In a second aspect, the present invention further provides a nuclear instrument system source range alarm threshold adaptive adjustment system, characterized in that it includes:

[0087] The source range count rate change rate calculation module is configured in the RN I protection cabinet to realize the conditioning and processing of the source range neutron detector signal, and has the source range count rate calculation function, the source range count rate change rate calculation function, the source range count rate output function, and the source range count rate change rate output function, and can output the source range count rate signal and the source range count rate change rate signal to the RN I control cabinet processing unit;

[0088] The core reactivity state judgment module is configured in a non-safety-level DCS platform, sets a source range count rate threshold, a first source range count rate change rate, a second source range count rate change rate and a third source range count rate change rate; obtains the current source range count rate and count rate change rate signal; obtains the current reactor state, the reactor state includes the period of loading and reactor power state improvement and the period of reactor power reduction and unloading; obtains a first comparison result based on the comparison between the source range count rate and the source range count rate threshold combined with the current reactor state, selects the source range count rate change rate to compare with the first source range count rate change rate or the second source range count rate change rate or the third source range count rate change rate through the first comparison result, obtains a second comparison result, and outputs the current core reactivity state through the second comparison result.

[0089] The main control room display and control module is configured in the main control room and connected to the core reactivity state judgment module, and is used to obtain the current source range count rate signal, the source range count rate change rate signal, the source range count rate threshold, the first source range count rate change rate, the second source range count rate change rate, the third source range count rate change rate, and display them in real time; it is used to set the source range count rate threshold, the first source range count rate change rate, the second source range count rate change rate, the third source range count rate change rate and set the current reactor state, and transmit them to the core reactivity state judgment module for reactivity state judgment.

[0090] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0091] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. The computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0092] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for adaptively adjusting source range alarm threshold of a nuclear instrument system, characterized in that: include: Set the source range count rate threshold, the first source range count rate change rate, the second source range count rate change rate, and the third source range count rate change rate; Get the current source range count rate, and get the current source range count rate change rate through the current source range count rate; Acquiring the current reactor state, wherein the reactor state includes a period of loading and reactor power state increase and a period of reactor power decrease and unloading; A first comparison result is obtained based on a comparison between the source range count rate and the source range count rate threshold value in combination with the current reactor state, and a source range count rate change rate is selected based on the first comparison result to compare with the first source range count rate change rate or the second source range count rate change rate or the third source range count rate change rate to obtain a second comparison result; The current core reactivity state is outputted through the second comparison result.

2. A method for adaptively adjusting source range alarm threshold of a nuclear instrument system according to claim 1, characterized in that: The outputting of the current core reactivity state comprises: If the current reactor state is during the reactor power state enhancement period, and the source range count rate is less than the source range count rate threshold, then the source range count rate change rate is selected to be compared with the first source range count rate change rate; If the source range count rate change rate is less than the first source range count rate change rate, then the core reactivity state of the current core fuel loading is output to be normal; If the source range count rate change rate is greater than or equal to the first source range count rate change rate, then the core reactivity state of the current core fuel loading is output as abnormal.

3. A method for adaptively adjusting source range alarm threshold of a nuclear instrument system according to claim 2, characterized in that: Also includes: If the current reactor state is during the reactor power state enhancement period, and the source range count rate is greater than or equal to the source range count rate threshold, then the source range count rate change rate is selected to be compared with the second source range count rate change rate; If the source range count rate change rate is less than the second source range count rate change rate, then the core reactivity state of the current core fuel loading is output to be normal; If the source range count rate change rate is greater than or equal to the second source range count rate change rate, then the core reactivity state of the current core fuel loading is output as abnormal.

4. A method for adaptively adjusting source range alarm threshold of a nuclear instrument system according to claim 1, characterized in that: The outputting of the current core reactivity state comprises: If the current reactor state is during reactor power reduction and unloading, and the source range count rate is less than the source range count rate threshold, then the source range count rate change rate is selected for comparison with the first source range count rate change rate; If the source range count rate change rate is less than the first source range count rate change rate, then the core reactivity state of the current core fuel loading is output to be normal; If the source range count rate change rate is greater than or equal to the first source range count rate change rate, then the core reactivity state of the current core fuel loading is output as abnormal.

5. A method for adaptively adjusting source range alarm threshold of a nuclear instrument system according to claim 4, characterized in that: Also includes: If the current reactor state is during reactor power reduction and unloading, and the source range count rate is greater than or equal to the source range count rate threshold, then the source range count rate change rate is selected for comparison with the third source range count rate change rate; If the source range count rate change rate is less than the third source range count rate change rate, then the core reactivity state of the current core fuel loading is output to be normal; If the source range count rate change rate is greater than or equal to the third source range count rate change rate, then the core reactivity state of the current core fuel loading is output as abnormal.

6. A method for adaptively adjusting source range alarm threshold of a nuclear instrument system according to claim 1, characterized in that: Also includes: Sending source range count rate and source range count rate change rate signals to a processing unit via a network; The processing unit sends the source range count rate signal and the source range count rate change rate signal to the non-safety level DCS through the network, and the source range alarm threshold adaptive adjustment method of the nuclear instrument system is set on the non-safety level DCS side; The abnormal core reactivity status signal of the current core fuel loading is sent to the alarm box speaker of the reactor building and the main control room respectively.

7. A method for adaptively adjusting source range alarm threshold of a nuclear instrument system according to claim 6, characterized in that: The processing unit is configured in the RNI control cabinet.

8. A nuclear instrument system source range alarm threshold adaptive adjustment system, characterized in that: include: The source range count rate change rate calculation module is configured in the RNI protection cabinet and is used to realize the conditioning and processing of the source range neutron detector signal; It includes a source range count rate calculation module, a source range count rate change rate calculation module, a source range count rate output module, and a source range count rate change rate output module, which are used to output the source range count rate signal and the source range count rate change rate signal to the RNI control cabinet processing unit; The core reactivity state judgment module is configured in a non-safety-level DCS platform, sets a source range count rate threshold, a first source range count rate change rate, a second source range count rate change rate, and a third source range count rate change rate; obtains a current source range count rate and a count rate change rate signal; obtains a current reactor state, the reactor state including a period of loading and reactor power state improvement and a period of reactor power reduction and unloading; obtains a first comparison result based on a comparison between the source range count rate and the source range count rate threshold combined with the current reactor state, selects a source range count rate change rate to compare with the first source range count rate change rate or the second source range count rate change rate or the third source range count rate change rate through the first comparison result, obtains a second comparison result, and outputs the current core reactivity state through the second comparison result; The main control room display and control module is configured in the main control room and connected to the core reactivity state judgment module, and is used to obtain the current source range count rate signal, the source range count rate change rate signal, the source range count rate threshold, the first source range count rate change rate, the second source range count rate change rate, the third source range count rate change rate, and display them in real time; it is used to set the source range count rate threshold, the first source range count rate change rate, the second source range count rate change rate, the third source range count rate change rate and set the current reactor state, and transmit them to the core reactivity state judgment module for reactivity state judgment.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, a method for adaptively adjusting the source range alarm threshold of a nuclear instrument system according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, a method for adaptively adjusting the source range alarm threshold of a nuclear instrument system according to any one of claims 1 to 7 is implemented.

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