Nuclear power plant safety important cable aging reserved sample screening method and system

Abstract

The invention discloses a nuclear power plant safety important cable aging reserved sample screening method and system, and relates to the technical field of nuclear power plant aging reserved samples, and the method comprises the following steps: collecting basic information; screening hotspot rooms based on the basic information; acquiring a main tray and a secondary tray passing through the hotspot room; screening cable models; a main tray and a secondary tray of a hot spot room are combined with a cable model to establish a relationship; and determining a reserved sample cable model and a reserved sample room. The reserved sample screening method capable of guiding nuclear power plant technicians to smoothly carry out cable aging reserved sample work is established by combining factors such as cable types, cable importance degrees, aging mechanisms and field implementability, and meanwhile, the reserved sample number is controlled to be an economically feasible degree, so that subsequent cable aging state evaluation and service life prediction are supported, and the reliability of the cable aging reserved sample screening method is improved. From a longer perspective, basic data can be accumulated and an evaluation sample can be provided for life prolonging of the nuclear power plant.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant aging sample retention, in particular to a method and system for screening aging sample retention of safety-critical cables in nuclear power plants. Background Art

[0002] There are huge cable systems in nuclear power plants. They are distributed in every corner of the nuclear power plant and play an important role in the safe operation of the nuclear power plant. Due to their large number and wide distribution, cable replacement is a very complex and expensive task, so whether they can continue to maintain their reliability is crucial. In addition, during the 60 to 80-year life of nuclear power plant cables, there is a risk of degradation due to aging mechanisms such as high temperature and radiation. In order to prevent cable failure and effectively manage cables, it is necessary to monitor the cable status and judge the aging status of the cable in combination with the cable life model. Many status monitoring methods are lossy. In addition, non-destructive monitoring of cables in the system may also cause damage due to human error. Samples of this type of cable are retained in the operating environment of the cable. Compared with equivalent aging after simulating the operating environment of the cable in the laboratory, the aging status of the cable is more accurate and economical.

[0003] However, it is still very difficult to screen out key sensitive cables from tens of thousands of cables and arrange them in areas where effective performance data can be obtained, while controlling the number of samples to an economically feasible level. The present invention proposes an effective screening method for nuclear power plant cables. Combining factors such as cable type, cable importance, aging mechanism, and on-site feasibility, it can guide nuclear power plant technicians to smoothly carry out cable aging sample retention work, support subsequent cable aging status evaluation and life prediction, and from a longer-term perspective, accumulate basic data for nuclear power plant life extension and provide evaluation samples. Summary of the invention

[0004] In view of the problems existing in the existing nuclear power plant safety-critical cable aging sample screening and system, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: critical sensitive cables are selected from tens of thousands of cables and arranged in areas where effective performance data can be obtained, while the number of retained samples is controlled to an economically feasible level.

[0007] In a first aspect, an embodiment of the present invention provides a method for screening samples of aging important cables for safety in a nuclear power plant, which comprises the following steps:

[0008] Collect basic information;

[0009] Filter hot rooms based on basic information;

[0010] Get the primary and secondary pallets that pass through the hotspot room;

[0011] Screening cable models;

[0012] The main tray and sub-tray in the hotspot room are combined with the cable model to establish a relationship;

[0013] Determine the sample cable model and sample storage room.

[0014] As a preferred solution of the method for screening samples of aging important cables for safety in nuclear power plants according to the present invention, the basic information collected includes:

[0015] Collect and organize basic information on cable design, manufacturing, laying, and power plant environment information to obtain cable coding rules, cable model list, plant environment, nuclear island radiation zoning, and cable laying information including cable starting / ending point equipment, starting / ending point rooms, length, and cable path information.

[0016] As a preferred solution of the method for screening samples of aging important cables for safety in nuclear power plants according to the present invention, the screening hotspot room includes:

[0017] According to the main aging mechanisms of cables in the nuclear island of a nuclear power plant, namely thermal aging and radiation aging, the parameter thresholds of the hot spot areas are determined, and then the hot spot rooms that exceed the parameter thresholds are screened and identified based on the plant environment information and nuclear power radiation zoning information.

[0018] As a preferred solution of the method for screening samples of aging important cables for safety in nuclear power plants according to the present invention, the main tray and the secondary tray that have been screened through the hot spot room include:

[0019] The cable laying bridge of the nuclear power plant is divided into main trays and secondary trays. The relationship between the trays and the rooms will be established according to the coding rules of the main trays and secondary trays, and then the main trays and secondary trays in the hot spot rooms will be identified;

[0020] When the coding rules do not correspond to the rooms, it is necessary to sort out the relationship between pallets and rooms from the pallet layout diagram of each floor.

[0021] As a preferred solution of the method for screening samples of aging important cables for safety in nuclear power plants according to the present invention, the cable models to be screened include:

[0022] The key sensitive cables of concern correspond to cables related to important safety items, including safety-grade cables, safety-related-grade cables, and cables that still need to perform functions after serious accidents.

[0023] As a preferred solution of the method for screening samples of aging important cables for safety in nuclear power plants according to the present invention, the cables of the secondary trays passing through the hot spot room are screened,

[0024] Based on the laying information in the cable master list exported from the cable laying management software, identify the cables laid on the secondary trays in the hot spot room;

[0025] Establishing the relationship between cable models and rooms includes:

[0026] The cable list that passes through the main tray of the hotspot room and the cable list that passes through the secondary tray of the hotspot room are combined to form a total list of key sensitive cables that pass through the hotspot room. Then, the cable models involved are sorted to form a list of key sensitive cable models that pass through the hotspot room.

[0027] According to the relationship between the main tray and sub-tray and the room, the rooms involved in the screened main tray and sub-tray cables and the rooms corresponding to the cable models involved in these cables are established, thereby establishing the association relationship between the key sensitive cable models passing through the hot spot room and the room.

[0028] As a preferred solution of the method for screening samples of aging cables important to safety in nuclear power plants according to the present invention, the cable model and the room for sampling are determined as follows:

[0029] The samples to be retained should cover the material categories and manufacturer categories of all key sensitive cables in high-temperature and high-irradiation hotspot areas;

[0030] Specifically include:

[0031] For cables produced by different manufacturers, set up corresponding sample objects to represent them;

[0032] Cables for different purposes should also be sampled separately;

[0033] For cables of the same type with multiple cross-sectional specifications, cables with representative cross-sectional specifications shall be selected as samples.

[0034] In a second aspect, an embodiment of the present invention provides a nuclear power plant safety-critical cable aging sample screening system, which includes an information collection module, a hotspot room screening module, a cable model screening module, and an information processing module;

[0035] The information collection module is responsible for collecting and collating basic information such as cable design, manufacturing, and laying, as well as power plant environmental information;

[0036] The hotspot room screening module determines the parameter threshold of the hotspot area according to the main aging mechanism of the cable aging in the nuclear island of the nuclear power plant;

[0037] The cable model screening module is used to screen key sensitive cables, including safety-grade cables, safety-related-grade cables, and cables that still need to perform functions after serious accidents;

[0038] The information processing module is used to determine the cable model and sample room for retention, covering the material category and manufacturer category of all key sensitive cables in high-temperature and high-irradiation hotspot areas.

[0039] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the processor executes the computer program, any step of the above-mentioned method for screening samples of aging important cables for safety in nuclear power plants is implemented.

[0040] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the above-mentioned method for screening samples of aging important cables for safety in nuclear power plants is implemented.

[0041] The beneficial effects of the present invention are as follows: by combining factors such as cable type, cable importance, aging mechanism, and on-site feasibility, a sample screening method is established to guide nuclear power plant technicians to smoothly carry out cable aging sample retention work, while controlling the number of retained samples to an economically feasible level, thereby supporting subsequent cable aging status evaluation and life prediction. From a longer-term perspective, basic data can also be accumulated for the life extension of nuclear power plants and evaluation samples can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing 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. Among them:

[0043] Figure 1 Flow chart of the method for screening samples of aging cables important to safety in nuclear power plants. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0047] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0048] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Example 1

[0051] Reference Figure 1 , which is the first embodiment of the present invention, and provides a method for screening samples of aging important cables for safety in nuclear power plants, comprising the following steps:

[0052] S1. Collect basic information.

[0053] Collecting basic information includes:

[0054] Collect and organize basic information on cable design, manufacturing, laying, and power plant environment information to obtain cable coding rules, cable model list, plant environment, nuclear island radiation zoning, and cable laying information including cable starting / ending point equipment, starting / ending point rooms, length, and cable path information.

[0055] S2. Filter hot rooms based on basic information.

[0056] Screening hotspot rooms include,

[0057] According to the main aging mechanisms of cables in the nuclear island of a nuclear power plant, namely thermal aging and radiation aging, the parameter thresholds (temperature threshold, cumulative radiation dose threshold) of the hot spot area are determined, and then the hot spot rooms that exceed the parameter thresholds are screened and identified based on the plant environment information and nuclear power radiation zoning information.

[0058] In the embodiment, according to the main aging mechanism of the cable aging in the nuclear island of a nuclear power plant, namely, thermal aging and radiation aging, it is determined that the room with a temperature higher than 45°C is a high-temperature hotspot room, and the radiation red zone (irradiation dose rate>100mSv / h) and the orange 2 zone (irradiation dose rate≤100mSv / h, and>10mSv / h) are radiation hotspot rooms. Then, the hotspot rooms exceeding the parameter threshold are screened and identified based on the plant environment information and nuclear power radiation zoning information. 254 hotspot rooms were screened out, including 65 high-temperature and high-irradiation rooms, 91 high-temperature rooms, and 98 high-irradiation rooms.

[0059] S3. Obtain the main tray and the secondary tray that pass through the hot spot room.

[0060] Screening of primary and secondary pallets passing through the hotspot room includes,

[0061] The cable laying bridge of the nuclear power plant is divided into main trays and secondary trays. The relationship between the trays and the rooms will be established according to the coding rules of the main trays and secondary trays, and then the main trays and secondary trays in the hot spot rooms will be identified;

[0062] When the coding rules do not correspond to the rooms, it is necessary to sort out the relationship between pallets and rooms from the pallet layout diagram of each floor.

[0063] The coding of the main cable tray includes the unit number, the plant where it is located, and the floor where the cable tray is located in the plant, etc. The coding of the secondary cable tray includes the unit number, the plant where it is located, and the room number, etc. Due to different coding rules, the main tray and secondary tray passing through the hot spot room need to be screened separately.

[0064] S4. Screen the cable models.

[0065] Screened cable models include,

[0066] The key sensitive cables of concern correspond to cables related to important safety items, including safety-grade cables (i.e., 1E-grade cables), safety-related-grade cables, and cables that still need to perform functions after serious accidents (cables with identification category K(S)).

[0067] It is necessary to establish the relationship between the cable classification information in the nuclear power plant design documents and the cables related to important safety items. For the Hualong One nuclear power unit, attention is paid to cables with functional classifications of F-SC1, F-SC2, F-SC3, or identification category K(S). A total of 127 cable models were screened out.

[0068] S5. The main tray and sub-tray passing through the hotspot room are combined with the cable model to establish a relationship.

[0069] Cables screened through the sub-trays in the hotspot room include,

[0070] According to the laying information in the cable master list exported from the cable laying management software (including the main tray and sub-tray information of the cables), identify the cables laid on the sub-trays in the hotspot rooms. Since there are tens of thousands of cables involved, programming languages ​​such as VBA can be used to help screen them;

[0071] Establishing the relationship between cable models and rooms includes:

[0072] The cable list that passes through the main tray of the hotspot room and the cable list that passes through the secondary tray of the hotspot room are combined to form a total list of key sensitive cables that pass through the hotspot room. Then, the cable models involved are sorted to form a list of key sensitive cable models that pass through the hotspot room.

[0073] According to the relationship between the main tray and sub-tray and the room, the rooms involved in the screened main tray and sub-tray cables and the rooms corresponding to the cable models involved in these cables are established, thereby establishing the association relationship between the key sensitive cable models passing through the hot spot room and the room.

[0074] S6. Determine the cable model and sample storage room.

[0075] Determine the sample cable model and sample room,

[0076] The samples to be retained should cover the material categories and manufacturer categories of all key sensitive cables in high-temperature and high-irradiation hotspot areas;

[0077] Specifically include:

[0078] For cables produced by different manufacturers, set up corresponding sample objects to represent them;

[0079] Cables for different purposes should also be sampled separately;

[0080] For cables of the same type with multiple cross-sectional specifications, cables with representative cross-sectional specifications shall be selected as samples.

[0081] In addition, when a certain type of cable passes through multiple hotspot rooms, a room with a relatively harsh environment and qualified for sampling is selected for sampling. If the room with a relatively harsh environment that the cable passes through does not have the conditions for sampling, a room with a similar or worse environment is selected for sampling. The principle of replacing low with high is adopted here.

[0082] The sample objects should cover the material categories and manufacturer categories of all key sensitive cables in high-temperature and high-irradiation hotspot areas. For cables produced by different manufacturers, try to set up corresponding sample objects to represent them. Cables for different purposes should also be sampled separately, including measuring cables, measuring cables for serious accidents, low-voltage power cables, control cables, etc. For cables of the same type with multiple cross-sectional specifications, cables with representative cross-sectional specifications can be selected as sample objects as appropriate. In addition, when a certain model of cable passes through multiple hotspot rooms, the room with a relatively harsh environment and sample retention conditions is selected for sampling. If the room with a relatively harsh environment that the cable passes through does not have the conditions for sampling, the sample is retained in a room with a similar or worse environment to the room. The principle of high replacing low is adopted here. Based on the above screening principles, 13 types of sample cable models and corresponding sample retention rooms were finally determined.

[0083] In summary, taking into account factors such as cable type, cable importance, aging mechanism, and on-site feasibility, a sample screening method is established to guide nuclear power plant technicians to smoothly carry out cable aging sampling work. At the same time, the number of samples is controlled to an economically feasible level, thereby supporting subsequent cable aging status evaluation and life prediction. From a longer-term perspective, it can also accumulate basic data for nuclear power plant life extension and provide evaluation samples.

[0084] Example 2

[0085] On the basis of the first embodiment, this embodiment further provides a nuclear power plant safety important cable aging sample screening system, including an information collection module, a hot spot room screening module, a cable model screening module, and an information processing module;

[0086] The information collection module is responsible for collecting and collating basic information such as cable design, manufacturing, and laying, as well as power plant environmental information;

[0087] The hotspot room screening module determines the parameter threshold of the hotspot area according to the main aging mechanism of the cable aging in the nuclear island of the nuclear power plant;

[0088] The cable model screening module is used to screen key sensitive cables, including safety-grade cables, safety-related-grade cables, and cables that still need to perform functions after serious accidents;

[0089] The information processing module is used to determine the cable model and sample room for retention, covering the material category and manufacturer category of all key sensitive cables in high-temperature and high-irradiation hotspot areas.

[0090] This embodiment also provides a computer device, which is applicable to the method for retaining samples of aging samples of important safety cables in nuclear power plants, including a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the method for retaining samples of aging samples of important safety cables in nuclear power plants proposed in the above embodiment.

[0091] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0092] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for selecting samples of aging important cables for safety in nuclear power plants proposed in the above embodiment is implemented.

[0093] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0094] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for screening samples of aging cables important to safety in nuclear power plants, characterized by: The following steps are included: Collect basic information; Filter hot rooms based on basic information; Get the primary and secondary pallets that pass through the hotspot room; Screening cable models; The main tray and sub-tray in the hotspot room are combined with the cable model to establish a relationship; Determine the sample cable model and sample storage room.

2. The method for screening samples of aging cables important to safety in nuclear power plants according to claim 1, characterized in that: The basic information collected includes: Collect and organize basic information on cable design, manufacturing, laying, and power plant environment information to obtain cable coding rules, cable model list, plant environment, nuclear island radiation zoning, and cable laying information including cable starting / ending point equipment, starting / ending point rooms, length, and cable path information.

3. The method for screening samples of aging cables important to safety in nuclear power plants according to claim 2, characterized in that: The screening hotspot rooms include, According to the main aging mechanism of cables in the nuclear island of a nuclear power plant, the parameter thresholds of the hot spot areas are determined, and then the hot spot rooms exceeding the parameter thresholds are screened and identified based on the plant environment information and nuclear power radiation zoning information.

4. The method for screening samples of aging cables important to safety in nuclear power plants according to claim 3, characterized in that: The main tray and the secondary tray of the screening through the hot spot room include, The cable laying bridge of the nuclear power plant is divided into main trays and secondary trays. The relationship between the trays and the rooms will be established according to the coding rules of the main trays and secondary trays, and then the main trays and secondary trays in the hot spot rooms will be identified; When the coding rules do not correspond to the rooms, it is necessary to sort out the relationship between pallets and rooms from the pallet layout diagram of each floor.

5. The method for screening samples of aging cables important to safety in nuclear power plants according to claim 4, characterized in that: Screened cable models include, The key sensitive cables of concern correspond to cables related to important safety items, including safety-grade cables, safety-related-grade cables, and cables that still need to perform functions after serious accidents.

6. The method for screening samples of aging cables important to safety in nuclear power plants according to claim 5, characterized in that: The screening of cables passing through the secondary tray of the hot spot room includes, Based on the laying information in the cable master list exported from the cable laying management software, identify the cables laid on the secondary trays passing through the hot spot room; Establishing the relationship between cable models and rooms includes: The cable list that passes through the main tray of the hotspot room and the cable list that passes through the secondary tray of the hotspot room are combined to form a total list of key sensitive cables that pass through the hotspot room. Then, the cable models involved are sorted to form a list of key sensitive cable models that pass through the hotspot room. According to the relationship between the main tray and sub-tray and the room, the rooms involved in the screened main tray and sub-tray cables and the rooms corresponding to the cable models involved in these cables are established, thereby establishing the association relationship between the key sensitive cable models passing through the hot spot room and the room.

7. The method for screening samples of aging cables important to safety in nuclear power plants according to claim 6, characterized in that: The cable model and sample room for sample retention are as follows: The samples to be retained should cover the material categories and manufacturer categories of all key sensitive cables in high-temperature and high-irradiation hotspot areas; Specifically include: For cables produced by different manufacturers, set up corresponding sample objects to represent them; Cables for different purposes should also be sampled separately; For cables of the same type with multiple cross-sectional specifications, cables with representative cross-sectional specifications shall be selected as samples.

8. A system for screening samples of aging cables important to safety in nuclear power plants, based on the method for screening samples of aging cables important to safety in nuclear power plants according to any one of claims 1 to 7, characterized in that: It includes an information collection module, a hotspot room screening module, a cable model screening module, and an information processing module; The information collection module is responsible for collecting and collating basic information such as cable design, manufacturing, and laying, as well as power plant environmental information; The hotspot room screening module determines the parameter threshold of the hotspot area according to the main aging mechanism of the cable aging in the nuclear island of the nuclear power plant; The cable model screening module is used to screen key sensitive cables, including safety-grade cables, safety-related-grade cables, and cables that still need to perform functions after serious accidents; The information processing module is used to determine the cable model and sample room for retention, covering the material category and manufacturer category of all key sensitive cables in high-temperature and high-irradiation hotspot areas.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for screening aging samples of safety-critical cables in nuclear power plants as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for screening aging samples of safety-critical cables in nuclear power plants as described in any one of claims 1 to 7 are implemented.

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