Passive charging method, device and equipment for nuclear power unit and medium

Abstract

The invention discloses a passive charging method, device and equipment for a nuclear power unit and a medium. The method comprises the following steps: determining a burn-up depth requirement of the replacement loading; an irradiated fuel assembly used for replacing a secondary neutron source assembly is screened out according to the burn-up depth requirement; and loading the irradiated fuel assembly to a target position in a passive reactor core as a replacement of the secondary neutron source assembly. According to the embodiment of the invention, the discharge pressure of liquid tritium can be relieved.

Description

Technical Field

[0001] The present invention relates to the field of core management technology, and in particular to a passive loading method, device, equipment and medium for a nuclear power unit. Background Art

[0002] The purpose of the nuclear reactor core plus neutron source assembly is to provide a starting neutron level to ensure effective supervision by the neutron detector outside the core. When the core is first loaded, the primary neutron source (252Cf) and the secondary neutron source (Sb-Be) are loaded at the same time. When the core is reloaded, only the secondary neutron source is loaded. The secondary neutron source needs to be irradiated in the core to reach the design source strength requirements, but at the same time, it will produce tritium after activation, which can be released into the coolant through the secondary neutron source cladding.

[0003] Tritium emission operation data of pressurized water reactor nuclear power plants at home and abroad show that secondary neutron source activation is an important source of tritium emission from pressurized water reactors. Canceling secondary neutron sources can reduce the emission of liquid tritium from power plants from the source. According to calculations by the Design Institute, the cancellation of secondary neutron sources for AP1000 units can reduce annual tritium emissions by at least 15%. Since the commercial operation of AP1000 third-generation nuclear power units, the pressure on liquid tritium emission control is relatively high, and there is a risk that liquid tritium emissions will exceed the management target value and approach the annual control value. Summary of the invention

[0004] The invention provides a passive loading method, device, equipment and medium for a nuclear power unit to relieve the discharge pressure of liquid tritium.

[0005] According to one aspect of the present invention, there is provided a passive loading method for a nuclear power unit, comprising:

[0006] Determine the required fuel consumption depth for this replacement loading;

[0007] Selecting irradiated fuel assemblies for replacing secondary neutron source assemblies according to the burnup depth requirement;

[0008] The irradiated fuel assembly is loaded into a target position in the passive core as a replacement for the secondary neutron source assembly.

[0009] According to another aspect of the present invention, there is provided a passive charging device for a nuclear power unit, comprising:

[0010] The requirement determination module is used to determine the fuel consumption depth requirement for this replacement load;

[0011] An assembly screening module, used for screening out irradiated fuel assemblies for replacing secondary neutron source assemblies according to the burnup depth requirement;

[0012] The assembly loading module is used to load the irradiated fuel assembly to a target position in the passive core as a replacement for the secondary neutron source assembly.

[0013] According to another aspect of the present invention, there is provided a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements the passive loading method for a nuclear power unit according to any embodiment of the present invention.

[0014] According to another aspect of the present invention, there is provided an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the passive loading method for a nuclear power unit as described in any embodiment of the present invention.

[0015] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the passive loading method of a nuclear power unit described in any embodiment of the present invention when executed by a processor.

[0016] The embodiment of the present invention solves the problem of high tritium emission in the third-generation AP1000 nuclear power plant from the source, uses irradiated fuel assemblies with specific burnup to replace secondary neutron sources for core loading supervision, and formulates a core loading plan after canceling the secondary neutron source. In addition, in addition to reducing liquid tritium emissions, the cancellation of the secondary neutron source in the AP1000 nuclear power plant can also save the subsequent purchase costs of replacing the secondary neutron source: the secondary neutron source has a lifespan of about 10 years. After canceling the secondary source, each unit can reduce 10 sets of secondary source assemblies within a 60-year lifespan, and each unit can save about 20 million yuan in secondary source procurement costs. The two units save a total of 40 million yuan, and at the same time, the two units can reduce 20 sets of secondary neutron source waste solids. In addition, canceling the secondary neutron source can deal with the situation where the unit is affected by the damage of the secondary neutron source and cannot be used, and can also avoid its radioactive contamination of the primary circuit.

[0017] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1A is a flow chart of a passive loading method for a nuclear power unit provided according to an embodiment of the present invention;

[0020] Figure 1B is a schematic diagram of eliminating a secondary neutron source according to an embodiment of the present invention;

[0021] Figure 2A is a flow chart of a passive loading method for a nuclear power unit provided according to another embodiment of the present invention;

[0022] Figure 2B A step diagram of canceling secondary neutron source loading in a power plant provided according to an embodiment of the present invention;

[0023] Figure 3 is a structural schematic diagram of a passive charging method for a nuclear power unit provided according to another embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of an electronic device implementing an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] Figure 1A This is a flowchart of a passive loading method for a nuclear power unit provided by an embodiment of the present invention. This embodiment is applicable to the case where the secondary neutron source assembly is no longer used to maintain the normal operation of the source range detector during the core loading process. The method can be executed by a passive loading device of the nuclear power unit. The device can be implemented in the form of hardware and / or software. The device can be configured in an electronic device with corresponding data processing capabilities, such as a fuel assembly loading system of a nuclear power plant. Figure 1A As shown, the method includes:

[0028] S110. Determine the fuel consumption depth requirement for this replacement loading.

[0029] S120. Screening out irradiated fuel assemblies for replacing secondary neutron source assemblies according to the burnup depth requirement.

[0030] S130. Replace the secondary neutron source assembly with the irradiated fuel assembly and load it into a target position in the passive core.

[0031] Specifically, during the operation of a nuclear power plant, the core will undergo processes such as refueling and shutdown for maintenance, which requires the loading of fuel assemblies. The power plant procedures stipulate that during the loading period, at least two source range neutron detectors must be able to effectively monitor the core neutrons to avoid abnormalities or accidents during the loading process. Figure 1B As shown, the secondary neutron source assembly is usually installed near the core position where the source range detectors A and B are cancelled. Cancelling the secondary neutron source assembly means canceling the two secondary neutron source assemblies loaded with the source range detectors A and B, and using irradiated fuel assemblies to replace the neutrons spontaneously generated by these two groups of secondary neutron sources to make the source range detectors meet the counting rate requirements.

[0032] Different processes have different burnup depth requirements for irradiated fuel assemblies used to replace secondary neutron source assemblies. When replacing and loading, the burnup depth requirement matching the replacement and loading of this process is first determined. Then, based on this burnup depth requirement, irradiated fuel assemblies that can be used to replace secondary neutron source assemblies are selected from the fuel assembly library. The number of irradiated fuel assemblies is at least 2 groups, and each group can include one or more irradiated fuel assemblies.

[0033] During the loading process, according to the established core loading sequence arrangement plan after the secondary neutron source is removed, the irradiated fuel assemblies are loaded into the positions near the source range detector A and the source range detector B respectively, and the irradiated fuel assemblies near the source range detector A and the source range detector B are used as new neutron sources to ensure the monitoring function of the external source range detectors in power plant activities such as loading. At the same time, the core positions originally designed for loading secondary neutron source assemblies are no longer placed with secondary neutron source assemblies.

[0034] For example, continue to refer to Figure 1B The number of irradiated fuel assemblies can be 6, divided into two groups and installed near the source range detector A (J15, H15, G15) and the source range detector B (J01, H01, G01). The core positions (H03, H13) originally designed for loading secondary neutron sources are no longer placed with secondary neutron sources.

[0035] The embodiment of the present invention solves the problem of high tritium emission in the third-generation AP1000 nuclear power plant from the source, uses irradiated fuel assemblies with specific burnup to replace secondary neutron sources for core loading supervision, and formulates a core loading plan after canceling the secondary neutron source. In addition, in addition to reducing liquid tritium emissions, the cancellation of the secondary neutron source in the AP1000 nuclear power plant can also save the subsequent purchase costs of replacing the secondary neutron source: the secondary neutron source has a lifespan of about 10 years. After canceling the secondary source, each unit can reduce 10 sets of secondary source assemblies within a 60-year lifespan, and each unit can save about 20 million yuan in secondary source procurement costs. The two units save a total of 40 million yuan, and at the same time, the two units can reduce 20 sets of secondary neutron source waste solids. In addition, canceling the secondary neutron source can deal with the situation where the unit is affected by the damage of the secondary neutron source and cannot be used, and can also avoid its radioactive contamination of the primary circuit.

[0036] Based on the above embodiment, optionally, when the reactor shutdown overhaul time is not more than 30 days, the burnup depth requirement is not less than 36000MWd / tU;

[0037] When the reactor is shut down for overhaul for no more than 180 days, the burnup depth requirement is no less than 36000MWd / tU;

[0038] When the reactor shutdown time is no more than 360 days, the burnup depth requirement is no less than 40,000 MWd / tU.

[0039] Specifically, assume that three groups of fuel assemblies are loaded in the core, located at H01, J01, and G01, and all are loaded with irradiated fuel assemblies with the same burnup depth to replace the corresponding secondary neutron source assemblies. After research and testing, the burnup depth requirements in this case are as follows:

[0040] When the reactor shutdown time is no more than 30 days, when the burnup depth of the peripheral assembly row closest to the source range detector is no less than 36000MWd / tU, the count rate of the source range detector near the source range detector during the loading period (from the first batch of fuel assemblies in place) is expected to be greater than 0.5cps;

[0041] When the reactor shutdown time is not more than 180 days, when the burnup depth of the peripheral assembly row closest to the source range detector is not less than 38600MWd / tU, the count rate of the source range detector near the source range detector during the loading period (from the first batch of fuel assemblies in place) is expected to be greater than 0.5cps;

[0042] When the reactor shutdown overhaul time is not more than 360 days, when the burnup depth of the row of peripheral components closest to the source range detector is not less than 40000MWd / tU, the counting rate of the source range detector near the loading period (starting from the first batch of fuel assemblies in place) is expected to be greater than 0.5cps.

[0043] Figure 2A A flowchart of a passive loading method for a nuclear power unit provided by another embodiment of the present invention is provided. This embodiment is optimized and improved on the basis of the above embodiment. Figure 2A As shown, the method includes:

[0044] S210. Determine the fuel consumption depth requirement for this replacement loading.

[0045] S220. Screen out irradiated fuel assemblies for replacing secondary neutron source assemblies according to the burnup depth requirement.

[0046] S230, performing a response test on the source range detector; after the response test is passed, loading the irradiated fuel assembly into a target position in the passive core as a replacement for the neutron source assembly.

[0047] S240. After the irradiated fuel assembly is installed, other fuel assemblies in the passive core are loaded.

[0048] The target position is the location of a row of peripheral components in the passive core that are closest to the source range detector.

[0049] Specifically, Figure 2BAs shown, the fuel assemblies are installed into the core in sequence according to the loading order given in the figure. Before loading, the source range detectors are respectively subjected to response tests at specific positions (1A, 1B, 1C, 1D in the figure). After the response test is passed, the irradiated fuel assemblies are placed in the position closest to the external source range detector in the core (J1, H1, G1, J15, H15, G15, R7, R8, R9, A7, A8, A9 in the figure). After the irradiated fuel assemblies have been placed, the source range detector can reach the expected position and start working. At this point, the remaining fuel assemblies in the core other than the irradiated fuel assemblies can be placed.

[0050] Based on the above embodiment, optionally, the number of the source range detectors is two pairs, and the step of loading the irradiated fuel assembly as a replacement for the neutron source assembly into a target position in the passive core includes:

[0051] loading two groups of irradiated fuel assemblies corresponding to the first pair of source range detectors into the first target position and the second target position in the passive core respectively;

[0052] The two groups of irradiated fuel assemblies corresponding to the second pair of source range detectors are loaded into the third target position and the fourth target position in the passive core respectively.

[0053] Specifically, during normal fuel loading, two source range detectors (source range detector SRA and source range detector SRB) are generally used to perform critical monitoring of loading in the south and north of the core, and a pair of source range detectors are also deployed in the east and west as redundant backups. When any source range detector in the south or north of the core is unavailable, the source range detector in the east or west can be used to continue the core loading supervision. Due to the high cost and contamination problems of secondary neutron source assemblies, in the actual fuel loading process, sometimes only one pair of neutron source assemblies are loaded in the core so that the first group of source range detectors can work normally. The second group generally does not deploy the corresponding secondary neutron source assemblies first, but when a problem occurs in the first group, the corresponding secondary neutron source assemblies of the first group are adjusted or new paired secondary neutron source assemblies are loaded so that the second group can work normally. There is a certain lag from the abnormality of the first group to the start of the second group. Considering that the irradiated fuel assembly is low in cost and less polluting than the secondary neutron source assembly, when loading the irradiated fuel assembly, the present invention not only loads the corresponding two groups of irradiated fuel assemblies for the first pair of source range detectors, but also loads the corresponding two groups of irradiated fuel assemblies for the second pair of source range detectors, regardless of whether the first pair of source range detectors is abnormal. In this way, once the first pair of source range detectors is abnormal, the second pair of source range detectors can start working immediately without waiting, thereby improving the safety redundancy.

[0054] Based on the above embodiment, optionally, the loading of other fuel assemblies in the passive core includes:

[0055] A fuel assembly without a secondary neutron source is loaded at the location where the secondary neutron source assembly was originally loaded.

[0056] Specifically, during the loading process of the remaining fuel assemblies, for the core positions originally designed for loading secondary neutron source assemblies, secondary neutron source assemblies are no longer placed therein, but conventional fuel assemblies without secondary neutron sources are loaded as needed.

[0057] When loading irradiated fuel assemblies, the embodiment of the present invention not only loads two corresponding sets of irradiated fuel assemblies for the first pair of source range detectors, but also loads two corresponding sets of irradiated fuel assemblies for the second pair of source range detectors, regardless of whether the first pair of source range detectors is abnormal. In this way, once the first pair of source range detectors is abnormal, the second pair of source range detectors can start working immediately without waiting, thereby improving the safety redundancy.

[0058] Figure 3 A schematic diagram of the structure of a passive charging device for a nuclear power unit provided by another embodiment of the present invention. Figure 3 As shown, the device comprises:

[0059] A requirement determination module 310 is used to determine the burnup depth requirement for this replacement loading;

[0060] An assembly screening module 320, for screening out irradiated fuel assemblies for replacing secondary neutron source assemblies according to the burnup depth requirement;

[0061] The assembly loading module 330 is used to load the irradiated fuel assembly as a replacement for the secondary neutron source assembly into a target position in the passive core.

[0062] The passive charging device of a nuclear power unit provided in an embodiment of the present invention can execute the passive charging method of a nuclear power unit provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0063] Optionally, the requirement determination module 310 includes:

[0064] A test unit, used for performing a response test on the source range detector;

[0065] A first loading unit is used to load the irradiated fuel assembly as a replacement for the neutron source assembly to a target position in the passive core after the response test is passed; the target position is a position of a row of peripheral assemblies closest to the source range detector in the passive core;

[0066] The second loading unit is used to load other fuel assemblies in the passive core after the irradiated fuel assembly is installed.

[0067] Optionally, a test unit for performing a response test on the source range detector;

[0068] A first loading unit is used to load the irradiated fuel assembly as a replacement for the neutron source assembly to a target position in the passive core after the response test is passed; the target position is a position of a row of peripheral assemblies closest to the source range detector in the passive core;

[0069] The second loading unit is used to load other fuel assemblies in the passive core after the irradiated fuel assembly is installed.

[0070] Optionally, the second loading unit includes a replacement loading subunit for loading a fuel assembly without a secondary neutron source at a position where the secondary neutron source assembly was originally loaded.

[0071] Optionally, when the reactor shutdown overhaul time is no more than 30 days, the burnup depth requirement is no less than 36000MWd / tU;

[0072] When the reactor is shut down for overhaul for no more than 180 days, the burnup depth requirement is no less than 36000MWd / tU;

[0073] When the reactor shutdown time is no more than 360 days, the burnup depth requirement is no less than 40,000 MWd / tU.

[0074] The passive charging device of the nuclear power unit further described can also execute the passive charging method of the nuclear power unit provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0075] Figure 4 A schematic diagram of the structure of an electronic device 40 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0076] like Figure 4As shown, the electronic device 40 includes at least one processor 41, and a memory connected to the at least one processor 41, such as a read-only memory (ROM) 42, a random access memory (RAM) 43, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 41 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 42 or the computer program loaded from the storage unit 48 to the random access memory (RAM) 43. In the RAM 43, various programs and data required for the operation of the electronic device 40 can also be stored. The processor 41, the ROM 42, and the RAM 43 are connected to each other through a bus 44. An input / output (I / O) interface 45 is also connected to the bus 44.

[0077] A number of components in the electronic device 40 are connected to the I / O interface 45, including: an input unit 46, such as a keyboard, a mouse, etc.; an output unit 47, such as various types of displays, speakers, etc.; a storage unit 48, such as a disk, an optical disk, etc.; and a communication unit 49, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 49 allows the electronic device 40 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0078] The processor 41 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 41 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The processor 41 performs the various methods and processes described above, such as the passive loading method of a nuclear power unit.

[0079] In some embodiments, the passive charging method of the nuclear power plant can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 48. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 40 via the ROM 42 and / or the communication unit 49. When the computer program is loaded into the RAM 43 and executed by the processor 41, one or more steps of the passive charging method of the nuclear power plant described above can be performed. Alternatively, in other embodiments, the processor 41 can be configured to execute the passive charging method of the nuclear power plant in any other appropriate manner (for example, by means of firmware).

[0080] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0081] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0082] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0083] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0084] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0085] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0086] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0087] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A passive charging method for a nuclear power unit, characterized in that: The method comprises: Determine the required fuel consumption depth for this replacement loading; Selecting irradiated fuel assemblies for replacing secondary neutron source assemblies according to the burnup depth requirement; The irradiated fuel assembly is loaded into a target position in the passive core as a replacement for the secondary neutron source assembly.

2. The method according to claim 1, characterized in that The step of replacing the secondary neutron source assembly with the irradiated fuel assembly and loading it into a target position in the passive core comprises: Conduct response tests on source range detectors; After the response test is passed, the irradiated fuel assembly is loaded into a target position in the passive core as a replacement for the neutron source assembly; the target position is the position of a row of peripheral assemblies in the passive core that is closest to the source range detector; After the irradiated fuel assembly is installed, other fuel assemblies in the passive core are loaded.

3. The method according to claim 2, characterized in that The number of the source range detectors is two pairs, and the step of loading the irradiated fuel assembly as a replacement for the neutron source assembly into a target position in the passive core comprises: loading two groups of irradiated fuel assemblies corresponding to the first pair of source range detectors into the first target position and the second target position in the passive core respectively; The two groups of irradiated fuel assemblies corresponding to the second pair of source range detectors are loaded into the third target position and the fourth target position in the passive core respectively.

4. The method according to claim 3, characterized in that The loading of other fuel assemblies in the passive core comprises: A fuel assembly without a secondary neutron source is loaded at the location where the secondary neutron source assembly was originally loaded.

5. The method according to claim 1, characterized in that: When the reactor is shut down for overhaul for no more than 30 days, the burnup depth requirement is no less than 36000MWd / tU; When the reactor is shut down for overhaul for no more than 180 days, the burnup depth requirement is no less than 36000MWd / tU; When the reactor shutdown time is no more than 360 days, the burnup depth requirement is no less than 40,000 MWd / tU.

6. A passive charging device for a nuclear power unit, characterized in that: The device comprises: The requirement determination module is used to determine the fuel consumption depth requirement for this replacement load; An assembly screening module, used for screening out irradiated fuel assemblies for replacing secondary neutron source assemblies according to the burnup depth requirement; The assembly loading module is used to load the irradiated fuel assembly to a target position in the passive core as a replacement for the secondary neutron source assembly.

7. The device according to claim 6, characterized in that The component loading module comprises: A test unit, used for performing a response test on the source range detector; A first loading unit is used to load the irradiated fuel assembly as a replacement for the neutron source assembly to a target position in the passive core after the response test is passed; the target position is a position of a row of peripheral assemblies closest to the source range detector in the passive core; The second loading unit is used to load other fuel assemblies in the passive core after the irradiated fuel assembly is installed.

8. The device according to claim 7, characterized in that The number of the source range detectors is two pairs, and the first loading unit is specifically used to: load the two groups of irradiated fuel assemblies corresponding to the first pair of source range detectors into the first target position and the second target position in the passive core, respectively; and load the two groups of irradiated fuel assemblies corresponding to the second pair of source range detectors into the third target position and the fourth target position in the passive core, respectively.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the passive loading method for a nuclear power unit according to any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the passive loading method for a nuclear power unit according to any one of claims 1 to 5 when executed.

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