A method and device for allocating unavailability rate indicators for planned outage of a nuclear power plant

Abstract

The present invention discloses a method and device for allocating unavailability indexes of planned outages of nuclear power plants, the method comprising: obtaining influencing factors of unavailability of nuclear power plants, the influencing factors comprising one or more of planned outages, unplanned outages, start-up compromise time, and reserved maneuvering time; determining the sum of unavailability of nuclear power plants under influencing factors; judging whether the sum of unavailability is greater than the unavailability target value of the nuclear power plant; if the sum of unavailability is greater than the unavailability target value, then reallocating the unavailability indexes of planned outages based on the unavailability target value. The present invention adopts a hierarchical allocation method, decomposes the overall unavailability index of planned outages that accounts for a relatively large proportion through an equal proportion allocation method based on the unavailability target value, and reallocates the window unavailability indexes within the planned outages, which is more accurate and systematic than the previous decomposition method that relies on experience, and can improve the operating efficiency and safety of nuclear power plants.

Description

Technical Field

[0001] The invention relates to the field of nuclear power plant reliability engineering, and in particular to a method and a device for allocating unavailability rate indicators of planned shutdown of a nuclear power plant. Background Art

[0002] Domestic and foreign markets are increasingly raising the requirements for the economic efficiency of nuclear power units. The AP1000 in the United States and the EPR in Europe have raised the unit availability index from about 85% in the second-generation nuclear power plant to an extremely high level of 92-93%, which has greatly improved their operating economy and their competitiveness in the international market. In the latest domestic nuclear power user requirement document, the availability of the latest nuclear power units is also required to be no less than 93%, which is somewhat difficult for nuclear power units and requires a lot of optimization for economic efficiency to achieve. According to the definition in the power standard DL / T 793-2012, the availability is defined as the ratio of available hours to statistical hours. The situation that causes the unit to be unavailable, that is, the shutdown state, can be divided into two situations: unplanned shutdown and planned shutdown. Planned shutdown means that the unit is in the planned maintenance period (including inspection, testing, technical transformation, replacement of nuclear fuel or maintenance, etc., and is in an unavailable state). Unplanned shutdown refers to the unplanned unit being in an unavailable state. According to the design characteristics and historical operating experience of nuclear power plants, unavailability caused by planned outages generally accounts for the majority of the unavailability. By using certain methods to redistribute the unavailability caused by planned outages, the unavailability rate of planned outages will be greatly reduced, thereby improving the overall availability index of the unit. The unavailability allocation work is aimed at new units with insufficient operating historical data. The overall goal is refined into each system and equipment, and the allocation of indicators is completed. By analyzing the granular equipment with evaluability, the comprehensive guarantee of the indicators is achieved. The unavailability allocation work is a bridge that combines the overall goal with the actual design, which provides input for the design and verification means for the overall indicators. This work is an important work for the new unit to achieve forward design. At present, foreign and domestic nuclear power plants often split the overall unavailability index according to the previous design and operation experience. There is no quantitative method to decompose the unavailability index layer by layer, and there is no quantitative method to allocate the index to other sub-levels.

[0003] The existing patent CN105184685B discloses an availability evaluation method for the nuclear power design stage, which is used to quantitatively predict the availability of a nuclear power plant, and includes the following steps: S1. Screening out systems whose single failure may cause unit tripping and reactor tripping; S2. For the equipment of the screened systems, performing FMEA analysis to determine the equipment failure mode that causes unit tripping and reactor tripping; S3. For each equipment failure mode, referring to the experience database to determine the failure rate and forced unavailability time of each equipment failure mode; S4. Calculating the annual unplanned shutdown frequency of the nuclear power plant through the failure rate of each equipment failure mode and the annual number of failures / annual time; calculating the annual mandatory unavailability time of the nuclear power plant through the failure rate and forced unavailability time of each equipment failure mode; S5. Judging the availability of the nuclear power plant based on the annual unplanned shutdown frequency and the annual mandatory unavailability time.

[0004] The existing patent CN117151485A discloses a method for evaluating the reliability status of nuclear power plant equipment, which is used to evaluate the reliability of the unit status this month, and includes the following steps: S1: Analyze the nuclear power plant equipment to obtain the non-shutdown event index value, the key equipment failure index value, the unplanned unavailability and failure index value of the safety system, the forced loss rate index value, the unit forced shutdown index value and the unexpected equipment defect index value and calculate the corresponding scores. S2: Calculate the total score of the reliability status of the nuclear power plant equipment using the scores of the non-shutdown event index value, the key equipment failure index value, the unplanned unavailability and failure index value of the safety system, the forced loss rate index value, the unit forced shutdown index value and the unexpected equipment defect index value, and evaluate the reliability of the nuclear power plant equipment through the difference in the monthly total score of the reliability status of the nuclear power plant equipment.

[0005] In summary, the above two existing patents do not solve the problem of inaccurate decomposition results caused by relying on design and operation experience to decompose the overall unavailability rate indicator in the prior art. Summary of the invention

[0006] Based on the above technical problems, the present invention proposes a method and device for allocating unavailability indicators for planned outages of nuclear power plants, which solves the problem of inaccurate decomposition results caused by relying on design and operation experience to decompose the overall unavailability indicator in the prior art.

[0007] To achieve the above object, the present invention proposes a method for allocating unavailability rate indicators for planned outages of nuclear power plants.

[0008] A method for allocating unavailability index for planned outage of a nuclear power plant, comprising:

[0009] Obtaining influencing factors of the unavailability rate of the nuclear power plant, the influencing factors including one or more of planned outage, unplanned outage, startup compromise time, and reserved maneuvering time;

[0010] Determine the total unavailability rate of the nuclear power plant under the influencing factors;

[0011] Determine whether the total unavailability rate is greater than the target unavailability rate of the nuclear power plant;

[0012] If the total unavailability is greater than the unavailability target value, the unavailability indicators of the planned outages are reallocated based on the unavailability target value.

[0013] Furthermore, the total unavailability rate of the nuclear power plant under the influencing factors is determined, including:

[0014] Obtain historical reference data corresponding to each influencing factor;

[0015] Based on historical reference data, determine the initial unavailability rate of the nuclear power plant under various influencing factors;

[0016] The total unavailability rate of the nuclear power plant is determined based on the initial unavailability rate.

[0017] Furthermore, it also includes:

[0018] Planned outages are classified into standard material replacement overhaul, five-year overhaul and ten-year overhaul.

[0019] Furthermore, the historical reference data corresponding to the standard refueling overhaul include the duration of outages for refueling and overhaul, and the number of outages for refueling and overhaul within 20 years; the historical reference data corresponding to the five-year overhaul include the duration of outages for overhaul of steam turbine generator sets, and the number of overhaul outages for steam turbine generator sets within 20 years; the historical reference data corresponding to the ten-year overhaul include the duration of outages for in-service inspections, and the number of in-service inspection outages within 20 years; the historical reference data corresponding to unplanned outages include the average annual number of forced outage days; the historical reference data corresponding to the startup compromise time include the number of days of unit availability loss from start-up to 100% power conversion; the historical reference data corresponding to the reserved maneuvering time include the number of days reserved for special matters within 20 years.

[0020] Furthermore, the total unavailability rate of the nuclear power plant is determined according to the initial unavailability rate, including:

[0021] According to the initial unavailability rate, the total unavailability rate of the nuclear power plant is determined by formula 1. Formula 1:

[0022] in, is the unavailability rate of the nuclear power plant under standard refueling and overhaul, K1 is the number of refueling and overhaul outages within 20 years, I1 is the duration of refueling and overhaul outages, is the unavailability rate of the nuclear power plant under five-year overhaul, K2 is the number of overhaul outages of the steam turbine generator set within 20 years, I2 is the duration of the overhaul outage of the steam turbine generator set, is the unavailability rate of the nuclear power plant under ten-year overhaul, K3 is the number of shutdowns for in-service inspections within 20 years, I3 is the duration of shutdowns for in-service inspections; I4 is the average annual number of forced shutdown days, I5 is the number of days reserved for special matters within 20 years, and I6 is the number of days of unit availability loss from startup to 100% power conversion.

[0023] Furthermore, the unavailability rate index of the planned outage is reallocated based on the unavailability rate target value, including:

[0024] Based on the unavailability target value, the overall unavailability index of each type of planned outage is reallocated, including the overall unavailability index allocation of standard refueling overhaul, the overall unavailability index allocation of five-year overhaul, and the overall unavailability index allocation of ten-year overhaul;

[0025] Based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated separately, including the unavailability index allocation of each window within the planned outage and the unavailability index allocation of each task under each window.

[0026] Furthermore, based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed, including:

[0027] Based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed by the proportional allocation method. The proportional allocation method corresponds to Formula 2: in, is the overall unavailability index for various types of planned outages, is the target value of the unavailability rate of the nuclear power plant, A i is the initial unavailability rate of nuclear power plants under various planned outages.

[0028] Furthermore, based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated, including:

[0029] Based on the overall unavailability rate index after redistribution, determine the total target allocation value of each type of planned outage window;

[0030] Determine the target allocation value of each window according to the total target allocation value of the window;

[0031] According to the target allocation value of each window, the unavailability rate index of each key task in each window is allocated.

[0032] Further, according to the total target allocation value of the window, the target allocation value of each window is determined, including:

[0033] Determine the potential optimization direction of the window and the influencing factors corresponding to each potential optimization direction;

[0034] Set the initial weight of each potential optimization direction in each window;

[0035] Determine the actual weight of each window based on the impact factor and the initial weight;

[0036] Get the initial allocation value of each window;

[0037] According to the initial allocation value and actual weight of each window, the target allocation value of each window is determined by formula 3. Formula 3:

[0038]

[0039] Where, ΔT i* is the target availability of the i-th window, ΔT * is the difference between the initial allocation total value and the target allocation total value of each type of planned outage window, w i is the actual weight of the i-th window, T i is the duration corresponding to the i-th window.

[0040] Furthermore, according to the target allocation value of each window, the unavailability rate index of each key task in each window is allocated, including:

[0041] Identify key tasks within each window;

[0042] Based on the optimization potential of key tasks, set initial weight values ​​for each key task;

[0043] Based on the initial weight value of each key task and the target allocation value of each window, the unavailability rate index of each key task in each window is allocated using Formula 4. Formula 4:

[0044]

[0045] in, is the unavailability rate indicator of the jth key task in the i-th window, T i* Assign a value to the target of the i-th window, is the initial weight value of the jth key task in the i-th window, is the initial allocation value of the jth key task in the i-th window.

[0046] Furthermore, the time margin value of each task in each window is obtained, and the task with the time margin value of zero is regarded as a key task.

[0047] To achieve the above object, the present invention proposes a device for allocating unavailability indexes for planned outages of nuclear power plants.

[0048] A device for allocating unavailability rate indicators for planned outages of nuclear power plants, comprising:

[0049] An acquisition module is used to acquire influencing factors of the unavailability rate of the nuclear power plant, wherein the influencing factors include one or more of planned outage, unplanned outage, start-up compromise time, and reserved maneuvering time;

[0050] A determination module, used for determining the sum of unavailability rates of the nuclear power plant under influencing factors;

[0051] A judgment module, used to judge whether the total unavailability rate is greater than the unavailability rate target value of the nuclear power plant;

[0052] The allocation module is used to reallocate the unavailability index of the planned outage based on the unavailability target value if the total unavailability is greater than the unavailability target value.

[0053] Further, a module is determined for:

[0054] Obtain historical reference data corresponding to each influencing factor;

[0055] Based on historical reference data, determine the initial unavailability rate of the nuclear power plant under various influencing factors;

[0056] The total unavailability rate of the nuclear power plant is determined based on the initial unavailability rate.

[0057] Furthermore, it also includes:

[0058] The classification module is used to classify planned outages, which include standard refueling overhaul, five-year overhaul, and ten-year overhaul.

[0059] Furthermore, the historical reference data corresponding to the standard refueling overhaul include the duration of outages for refueling and overhaul, and the number of outages for refueling and overhaul within 20 years; the historical reference data corresponding to the five-year overhaul include the duration of outages for overhaul of steam turbine generator sets, and the number of overhaul outages for steam turbine generator sets within 20 years; the historical reference data corresponding to the ten-year overhaul include the duration of outages for in-service inspections, and the number of in-service inspection outages within 20 years; the historical reference data corresponding to unplanned outages include the average annual number of forced outage days; the historical reference data corresponding to the startup compromise time include the number of days of unit availability loss from start-up to 100% power conversion; the historical reference data corresponding to the reserved maneuvering time include the number of days reserved for special matters within 20 years.

[0060] Furthermore, the total unavailability rate of the nuclear power plant is determined according to the initial unavailability rate, including:

[0061] According to the initial unavailability rate, the total unavailability rate of the nuclear power plant is determined by formula 1. Formula 1:

[0062] in, is the unavailability rate of the nuclear power plant under standard refueling and overhaul, K1 is the number of refueling and overhaul outages within 20 years, I1 is the duration of refueling and overhaul outages, is the unavailability rate of the nuclear power plant under five-year overhaul, K2 is the number of overhaul outages of the steam turbine generator set within 20 years, I2 is the duration of the overhaul outage of the steam turbine generator set, is the unavailability rate of the nuclear power plant under ten-year overhaul, K3 is the number of shutdowns for in-service inspections within 20 years, I3 is the duration of shutdowns for in-service inspections; I4 is the average annual number of forced shutdown days, I5 is the number of days reserved for special matters within 20 years, and I6 is the number of days of unit availability loss from startup to 100% power conversion.

[0063] Furthermore, the allocation module is used to:

[0064] Based on the unavailability target value, the overall unavailability index of each type of planned outage is reallocated, including the overall unavailability index allocation of standard refueling overhaul, the overall unavailability index allocation of five-year overhaul, and the overall unavailability index allocation of ten-year overhaul;

[0065] Based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated separately, including the unavailability index allocation of each window within the planned outage and the unavailability index allocation of each task under each window.

[0066] Furthermore, based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed, including:

[0067] Based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed by the proportional allocation method. The proportional allocation method corresponds to Formula 2: in, is the overall unavailability index for various types of planned outages, is the target value of the unavailability rate of the nuclear power plant, A i is the initial unavailability rate of nuclear power plants under various planned outages.

[0068] Furthermore, based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated, including:

[0069] Based on the overall unavailability rate index after redistribution, determine the total target allocation value of each type of planned outage window;

[0070] Determine the target allocation value of each window according to the total target allocation value of the window;

[0071] According to the target allocation value of each window, the unavailability rate index of each key task in each window is allocated.

[0072] Further, according to the total target allocation value of the window, the target allocation value of each window is determined, including:

[0073] Determine the potential optimization direction of the window and the influencing factors corresponding to each potential optimization direction;

[0074] Set the initial weight of each potential optimization direction in each window;

[0075] Determine the actual weight of each window based on the impact factor and the initial weight;

[0076] Get the initial allocation value of each window;

[0077] According to the initial allocation value and actual weight of each window, the target allocation value of each window is determined by formula 3. Formula 3:

[0078]

[0079] Where, ΔT i* is the target availability of the i-th window, ΔT * is the difference between the initial allocation total value and the target allocation total value of each type of planned outage window, w i is the actual weight of the i-th window, T i is the duration corresponding to the i-th window.

[0080] Furthermore, according to the target allocation value of each window, the unavailability rate index of each key task in each window is allocated, including:

[0081] Identify key tasks within each window;

[0082] Based on the optimization potential of key tasks, set initial weight values ​​for each key task;

[0083] Based on the initial weight value of each key task and the target allocation value of each window, the unavailability rate index of each key task in each window is allocated using Formula 4. Formula 4:

[0084]

[0085] in, is the unavailability rate indicator of the jth key task in the i-th window, T i* Assign a value to the target of the i-th window, is the initial weight value of the jth key task in the i-th window, is the initial allocation value of the jth key task in the i-th window.

[0086] Furthermore, the time margin value of each task in each window is obtained, and the task with the time margin value of zero is regarded as a key task.

[0087] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0088] 1. Aiming at the situation that the sum of actual unavailability of nuclear power plants is greater than the target value of unavailability, the present invention proposes to adopt a hierarchical allocation method. Based on the target value of unavailability, the overall unavailability index of planned outages with a relatively large proportion is decomposed by an equal proportion allocation method, and the window unavailability index within the planned outage is reallocated. Compared with the previous decomposition method relying on experience, this method is more accurate and systematic, which can ensure that the allocation of unavailability index of nuclear power plants is more scientific and reasonable, and can provide a reference basis for the design of nuclear power plants, thereby improving the operating efficiency and safety of nuclear power plants.

[0089] 2. The present invention proposes to determine the total target allocation value of each window within each planned outage based on the overall unavailability index after redistribution, and determine the target allocation value of each window based on the total target allocation value of the window, combined with the optimization direction and weight of each window, so as to achieve the allocation of the unavailability index of each key task in each window. The method and device enable nuclear power plants to carry out refined management of different types of planned outages, each window and key tasks within the window, optimize resource allocation, reduce unnecessary outage time, and improve the availability and economic benefits of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0091] Figure 1 A flow chart of a method for allocating unavailability rate indicators for planned outages of nuclear power plants according to an embodiment of the present invention;

[0092] Figure 2 A flow chart of a method for allocating unavailability rate indicators for planned outages of nuclear power plants according to an embodiment of the present invention;

[0093] Figure 3 A schematic diagram of a device for allocating unavailability indicators for planned outages of nuclear power plants according to an embodiment of the present invention. DETAILED DESCRIPTION

[0094] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0095] The present invention is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0096] Example

[0097] In order to solve the problem of inaccurate decomposition results caused by relying on design and operation experience to decompose the overall unavailability index in the prior art, the present invention proposes a method and device for allocating unavailability indexes for planned outages of nuclear power plants.

[0098] To achieve the above object, the present invention proposes a method for allocating unavailability rate indicators for planned outages of nuclear power plants.

[0099] like Figure 1 FIG. 4 shows a flow chart of a method for allocating unavailability rate indicators for planned outages of a nuclear power plant in one embodiment of the present invention, the method comprising:

[0100] S1, obtain the influencing factors of the unavailability rate of nuclear power plants.

[0101] The influencing factors include one or more of planned outages, unplanned outages, start-up compromise time, and reserved maneuvering time. Furthermore, according to the test and maintenance items required by the design and their implementation cycles, the items covered by each planned outage are different. According to the expected planned outage time, when modeling the unavailable time assessment, the planned outages can be divided into several types. There are large differences in the outage time of various types of planned outages, and each type is evaluated with a typical outage process as a representative of this type. In this embodiment, taking a pressurized water reactor as an example, its planned outage categories include standard refueling overhaul, five-year overhaul, and ten-year overhaul. That is, the influencing factors of the unavailability rate of a nuclear power plant include standard refueling overhaul, five-year overhaul, ten-year overhaul, unplanned outage, start-up compromise time, and reserved maneuvering time.

[0102] S2, determines the total unavailability rate of the nuclear power plant under the influencing factors.

[0103] Furthermore, the total unavailability rate of the nuclear power plant under the influencing factors is determined, including:

[0104] S201, obtaining historical reference data corresponding to each influencing factor.

[0105] This embodiment combines the historical operating data of similar models and the analysis of the impact of the design features of specific units on unavailability, where the "historical reference data" includes statistical analysis of the actual planned outages and unplanned outages of in-service power plants, combing the main line paths of planned outages of in-service power plants as a reference, and collecting the actual operating time of the main line path projects. The data obtained through the above steps is based on the operating experience of similar power plants. When the target power plant is an innovative reactor type, the unit needs to be analyzed for characteristics. Impact analysis of the design features of a specific unit refers to analyzing the impact of the design features of the new reactor type on planned outages, unplanned outages and other factors one by one, and evaluating them in a qualitative or quantitative manner. For example, the impact of the design features of a specific unit on planned outages, unplanned outages and other factors is evaluated by the initial unavailability rate under each influencing factor.

[0106] Furthermore, the historical reference data corresponding to the standard refueling overhaul include the duration of outages for refueling and overhaul, and the number of outages for refueling and overhaul within 20 years. The historical reference data corresponding to the five-year overhaul include the duration of outages for overhaul of steam turbine generator sets, and the number of outages for overhaul of steam turbine generator sets within 20 years. The historical reference data corresponding to the ten-year overhaul include the duration of in-service inspection outages, and the number of in-service inspection outages within 20 years. The historical reference data corresponding to unplanned outages include the average annual number of forced outage days. The historical reference data corresponding to the startup compromise time include the number of days of unit availability loss from start-up to 100% power conversion. The historical reference data corresponding to the reserved maneuvering time include the number of days reserved for special matters within 20 years. In summary, the components of nuclear power plant unavailability include "refueling and overhaul (referred to as standard refueling overhaul)", "outage of steam turbine generator units for overhaul", "outage for in-service inspection", "average annual number of forced outage days", "loss of unit availability converted from starting up to 100% power" and "reservation for special matters".

[0107] S202: Based on historical reference data, determine the initial unavailability rate of the nuclear power plant under various influencing factors.

[0108] S203, determining the total unavailability rate of the nuclear power plant according to the initial unavailability rate.

[0109] Furthermore, in this step, the total unavailability rate of the nuclear power plant is determined according to the initial unavailability rate by formula 1. Formula 1:

[0110] in, is the unavailability rate of the nuclear power plant under standard refueling and overhaul, K1 is the number of refueling and overhaul outages within 20 years, I1 is the duration of refueling and overhaul outages, is the unavailability rate of the nuclear power plant under five-year overhaul, K2 is the number of overhaul outages of the steam turbine generator set within 20 years, I2 is the duration of the overhaul outage of the steam turbine generator set, is the unavailability rate of the nuclear power plant under the ten-year overhaul, K3 is the number of in-service inspection shutdowns within 20 years, I3 is the duration of in-service inspection shutdowns. I4 is the average number of forced shutdown days per year, I5 is the number of days reserved for special events within 20 years, and I6 is the number of days of unit availability loss from start-up to 100% power conversion.

[0111] Table 1 Initial unavailability of nuclear power plants under various influencing factors

[0112] project Initial unavailability rate Standard refueling overhaul 3.26％ Five-year overhaul 1.1％ Ten-year overhaul 0.82％ Unplanned outage 1.3％ Startup compromise time 0.36％ Allow time for maneuvering 1.64％ total 8.48％

[0113] S3, judging whether the total unavailability rate is greater than the unavailability rate target value of the nuclear power plant.

[0114] In this embodiment, the user's total availability index for this type of pressurized water reactor is 93%, and the unavailability target value is 7%. Based on the above Table 1, it can be seen that the actual total unavailability of the nuclear power plant is 8.48%, which is greater than the unavailability target value of the nuclear power plant.

[0115] S4, if the total unavailability is greater than the unavailability target value, the unavailability indicators of the planned outages are reallocated based on the unavailability target value.

[0116] Furthermore, the unavailability rate index of the planned outage is reallocated based on the unavailability rate target value, including the following sub-steps:

[0117] S401, based on the unavailability target value, reallocate the overall unavailability index of each type of planned outage.

[0118] The specific allocation contents include: allocation of overall unavailability index for standard material replacement overhaul, allocation of overall unavailability index for five-year overhaul, and allocation of overall unavailability index for ten-year overhaul.

[0119] Furthermore, based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed, including:

[0120] Based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed by the proportional allocation method. The proportional allocation method corresponds to Formula 2: in, is the overall unavailability index for various types of planned outages, is the target value of the unavailability rate of the nuclear power plant, A iis the initial unavailability rate of the nuclear power plant under various types of planned outages. Substituting the unavailability target value of 7% in this embodiment and the initial unavailability rate in the above Table 1 into the above formula 2, the overall unavailability rate indicators of the three types of planned outages are obtained as follows: 2.7%, 0.91%, and 0.68%, respectively.

[0121] S402: Based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are respectively allocated.

[0122] The specific allocation contents include: allocation of unavailability rate indicators for each window within the planned outage and allocation of unavailability rate indicators for each task under each window.

[0123] Furthermore, if Figure 2 As shown in the figure, based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated, including:

[0124] S4021, based on the reallocated overall unavailability index, determine the total target allocation value of windows within each type of planned outage.

[0125] Taking the standard refueling overhaul as an example, the corresponding overall unavailability index is 2.7%, that is, In this embodiment, K1 is 10, and the total target allocation value of the standard refueling overhaul inner window is 474.

[0126] S4022, determining the target allocation value of each window according to the total target allocation value of the window.

[0127] Further, according to the total target allocation value of the window, the target allocation value of each window is determined, including:

[0128] (1) Determine the potential optimization direction of the window and the influencing factors corresponding to each potential optimization direction.

[0129] In this embodiment, potential optimization directions of the window include: a. improving automation capability, whose corresponding impact factor is 0.5; b. reducing the number of projects, whose corresponding impact factor is 1; and c. optimizing system performance, whose corresponding impact factor is 0.5.

[0130] (2) Set the initial weight of each potential optimization direction in each window.

[0131] Taking the M0-M1 decoupling-reaching normal cold shutdown window corresponding to the standard refueling overhaul in Table 2 as an example, the initial weight corresponding to the direction of improving automation capability is 0.5, the initial weight corresponding to the direction of reducing the number of projects is 1, and the initial weight corresponding to the direction of optimizing system performance is 0.

[0132] Table 2 Window division, window initial allocation value, and window initial weight corresponding to standard refueling overhaul

[0133]

[0134] (3) Determine the actual weight of each window based on the impact factor and the initial weight.

[0135] Based on impact factor ξ j , initial weight The actual weight of each window can be determined by the following formula: where ξ j represents the influencing factor of the jth potential optimization direction, represents the initial weight of the jth potential optimization direction in the i-th window.

[0136] (4) Obtain the initial allocation value of each window.

[0137] Table 2 shows the initial allocation values ​​for each window in a standard refueling overhaul.

[0138] (5) According to the initial allocation value and actual weight of each window, the target allocation value of each window is determined by formula 3.

[0139] Formula 3: Where, ΔT i* is the target availability of the i-th window, ΔT * is the difference between the initial allocation total value and the target allocation total value of each type of planned outage window, w i is the actual weight of the i-th window, T i is the duration corresponding to the i-th window.

[0140] Table 3 Target allocation values ​​for each window corresponding to the standard refueling overhaul

[0141]

[0142] S4023, allocating the unavailability rate indicator of each key task in each window according to the target allocation value of each window.

[0143] Furthermore, according to the target allocation value of each window, the unavailability rate index of each key task in each window is allocated, including:

[0144] First, identify the key tasks within each window.

[0145] Taking the M0-M1 window under the standard refueling overhaul as an example, the initial allocation value of each task in the window is determined based on the initial allocation value of the M0-M1 window. (the initial allocation value of the jth critical task in the i-th window), and the time margin value of each task (Time margin value of the jth critical task in the i-th window), the time margin can be understood as the difference between the actual time of the task and the maximum allowed time. In this embodiment, the task with a time margin of 0 is taken as the critical task, as shown in Table 4, which shows the critical tasks and the corresponding initial allocation values ​​in the M0-M1 window corresponding to the standard refueling overhaul.

[0146] Table 4 Key tasks and corresponding initial allocation values ​​within the standard refueling overhaul M0-M1 window

[0147]

[0148] Secondly, based on the optimization potential of key tasks, an initial weight value is set for each key task.

[0149] Based on the optimization potential (optimization space) of the key tasks, set the initial weight value for them The weight value is a value between 0 and 1. The larger the value, the smaller the optimization potential. Table 5 shows the initial weight values ​​corresponding to the key tasks in the M0-M1 window of the standard refueling overhaul.

[0150] Table 5 Initial weight values ​​corresponding to key tasks within the M0-M1 window of standard refueling overhaul

[0151] Insert the control rod 0.8 Stable work 0.1 Cooling and pressure reduction (first stage) 0.9 Safety valve test 0 Cooling and pressure reduction (two stages) 0.9 Commissioning of residual discharge system 0.5 Stabilizer steam extinguishing chamber 1 Cooling and pressure reduction (three stages) 0.9

[0152] Finally, based on the initial weight value of each key task and the target allocation value of each window, the unavailability rate index of each key task in each window is allocated using Formula 4.

[0153] Formula 4: in, is the unavailability rate indicator of the jth key task in the i-th window, T i* Assign a value to the target of the i-th window, is the initial weight value of the jth key task in the i-th window, is the initial allocation value of the jth key task in the i-th window.

[0154] Table 6 shows the allocation of unavailability indicators corresponding to the key tasks in the standard refueling overhaul M0-M1 window. The unavailability indicator represents the target downtime of the key task. By allocating and determining the unavailability indicators of the key tasks in each window under each planned outage type, a basis is provided for judging whether the design scheme meets the standards. When the actual downtime of the window exceeds the target allocation value, it means that other tasks have become new "key tasks", and step S4023 is re-executed to identify the key tasks in each window and iterate.

[0155] Table 6 Unavailability index corresponding to key tasks in the M0-M1 window

[0156]

[0157] To achieve the above object, the present invention proposes a device for allocating unavailability indexes for planned outages of nuclear power plants.

[0158] like Figure 3 2 shows a schematic diagram of a device for allocating unavailability rate indicators of a planned outage of a nuclear power plant according to an embodiment of the present invention, the device comprises: an acquisition module 31, a determination module 32, a judgment module 33, and an allocation module 34. The functions of each module will be introduced below.

[0159] The acquisition module 31 is used to acquire the influencing factors of the unavailability rate of the nuclear power plant, and the influencing factors include one or more of planned outage, unplanned outage, startup compromise time, and reserved maneuvering time.

[0160] The determination module 32 is used to determine the total unavailability rate of the nuclear power plant under the influencing factors.

[0161] Further, the determination module 32 is used to:

[0162] Obtain historical reference data corresponding to each influencing factor.

[0163] Based on historical reference data, the initial unavailability rate of the nuclear power plant under various influencing factors is determined respectively.

[0164] The total unavailability rate of the nuclear power plant is determined based on the initial unavailability rate.

[0165] Furthermore, it also includes:

[0166] The classification module 35 is used to classify the planned outages, which include standard refueling overhaul, five-year overhaul, and ten-year overhaul.

[0167] Furthermore, the historical reference data corresponding to the standard refueling overhaul include the duration of outages for refueling and overhaul, and the number of outages for refueling and overhaul within 20 years. The historical reference data corresponding to the five-year overhaul include the duration of outages for overhaul of steam turbine generator sets, and the number of outages for overhaul of steam turbine generator sets within 20 years. The historical reference data corresponding to the ten-year overhaul include the duration of in-service inspection outages, and the number of in-service inspection outages within 20 years. The historical reference data corresponding to unplanned outages include the average annual number of forced outage days. The historical reference data corresponding to the startup compromise time include the number of days of unit availability loss from start-up to 100% power conversion. The historical reference data corresponding to the reserved maneuvering time include the number of days reserved for special matters within 20 years.

[0168] Furthermore, the total unavailability rate of the nuclear power plant is determined according to the initial unavailability rate, including:

[0169] According to the initial unavailability rate, the total unavailability rate of the nuclear power plant is determined by formula 1. Formula 1:

[0170] in, is the unavailability rate of the nuclear power plant under standard refueling and overhaul, K1 is the number of refueling and overhaul outages within 20 years, I1 is the duration of refueling and overhaul outages, is the unavailability rate of the nuclear power plant under five-year overhaul, K2 is the number of overhaul outages of the steam turbine generator set within 20 years, I2 is the duration of the overhaul outage of the steam turbine generator set, is the unavailability rate of the nuclear power plant under the ten-year overhaul, K3 is the number of in-service inspection shutdowns within 20 years, I3 is the duration of in-service inspection shutdowns. I4 is the average number of forced shutdown days per year, I5 is the number of days reserved for special events within 20 years, and I6 is the number of days of unit availability loss from start-up to 100% power conversion.

[0171] The judgment module 33 is used to judge whether the total unavailability rate is greater than the unavailability rate target value of the nuclear power plant.

[0172] The allocation module 34 is configured to reallocate the unavailability indicators of the planned outages based on the unavailability target value if the total unavailability is greater than the unavailability target value.

[0173] Furthermore, the allocation module 34 is used to:

[0174] Based on the unavailability target value, the overall unavailability indicators of various planned outages are reallocated, including the overall unavailability indicator allocation for standard material refueling overhaul, the overall unavailability indicator allocation for five-year overhaul, and the overall unavailability indicator allocation for ten-year overhaul.

[0175] Based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated separately, including the unavailability index allocation of each window within the planned outage and the unavailability index allocation of each task under each window.

[0176] Furthermore, based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed, including:

[0177] Based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed by the proportional allocation method. The proportional allocation method corresponds to Formula 2: in, is the overall unavailability index for various types of planned outages, is the target value of the unavailability rate of the nuclear power plant, A i is the initial unavailability rate of nuclear power plants under various planned outages.

[0178] Furthermore, based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated, including:

[0179] Based on the reallocated overall unavailability rate indicator, determine the total target allocation value of each type of planned outage window.

[0180] The target allocation value of each window is determined according to the total target allocation value of the window.

[0181] According to the target allocation value of each window, the unavailability rate index of each key task in each window is allocated.

[0182] Further, according to the total target allocation value of the window, the target allocation value of each window is determined, including:

[0183] Determine the potential optimization directions of the window and the influencing factors corresponding to each potential optimization direction.

[0184] Set the initial weight of each potential optimization direction in each window.

[0185] The actual weight of each window is determined based on the impact factor and the initial weight.

[0186] Get the initial allocation value for each window.

[0187] According to the initial allocation value and actual weight of each window, the target allocation value of each window is determined by formula 3. Formula 3:

[0188]

[0189] Where, ΔT i* is the target availability of the i-th window, ΔT * is the difference between the initial allocation total value and the target allocation total value of each type of planned outage window, w i is the actual weight of the i-th window, T i is the duration corresponding to the i-th window.

[0190] Furthermore, according to the target allocation value of each window, the unavailability rate index of each key task in each window is allocated, including:

[0191] Identify key tasks within each window.

[0192] Furthermore, the time margin value of each task in each window is obtained, and the task with the time margin value of zero is regarded as a key task.

[0193] Based on the optimization potential of key tasks, an initial weight value is set for each key task.

[0194] Based on the initial weight value of each key task and the target allocation value of each window, the unavailability rate index of each key task in each window is allocated using Formula 4. Formula 4:

[0195]

[0196] in, is the unavailability rate indicator of the jth key task in the i-th window, T i* Assign a value to the target of the i-th window, is the initial weight value of the jth key task in the i-th window, is the initial allocation value of the jth key task in the i-th window.

[0197] It should be understood that a device for allocating unavailability indicators for planned outages of nuclear power plants is consistent with the description of an embodiment of a corresponding method for allocating unavailability indicators for planned outages of nuclear power plants, so this embodiment will not be described in detail.

[0198] In summary, it can be seen from the above description that the above embodiments of the present invention achieve the following technical effects:

[0199] 1. Aiming at the situation that the sum of actual unavailability of nuclear power plants is greater than the target value of unavailability, the present invention proposes to adopt a hierarchical allocation method. Based on the target value of unavailability, the overall unavailability index of planned outages with a relatively large proportion is decomposed by an equal proportion allocation method, and the window unavailability index within the planned outage is reallocated. Compared with the previous decomposition method relying on experience, this method is more accurate and systematic, which can ensure that the allocation of unavailability index of nuclear power plants is more scientific and reasonable, and can provide a reference basis for the design of nuclear power plants, thereby improving the operating efficiency and safety of nuclear power plants.

[0200] 2. The present invention proposes to determine the total target allocation value of each window within each planned outage based on the overall unavailability index after redistribution, and determine the target allocation value of each window based on the total target allocation value of the window, combined with the optimization direction and weight of each window, so as to achieve the allocation of the unavailability index of each key task in each window. The method and device enable nuclear power plants to carry out refined management of different types of planned outages, each window and key tasks within the window, optimize resource allocation, reduce unnecessary outage time, and improve the availability and economic benefits of nuclear power plants.

[0201] The above description is only a preferred embodiment of the present invention and is 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.

[0202] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0203] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in combination with these instruction execution systems, apparatuses or devices.

[0204] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0205] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A method for allocating unavailability rate indicators for planned outages of nuclear power plants, characterized in that: include: Obtaining influencing factors of unavailability of a nuclear power plant, wherein the influencing factors include one or more of planned outage, unplanned outage, startup compromise time, and reserved maneuvering time; Determining the total unavailability rate of the nuclear power plant under the influencing factors; Determining whether the total unavailability rate is greater than a target unavailability rate value of the nuclear power plant; If the total unavailability rate is greater than the unavailability rate target value, the unavailability rate indicators of the planned outage are reallocated based on the unavailability rate target value.

2. The method according to claim 1, characterized in that Determining the total unavailability rate of the nuclear power plant under the influencing factors includes: Obtain historical reference data corresponding to each influencing factor; Based on the historical reference data, respectively determining the initial unavailability rate of the nuclear power plant under the various influencing factors; The total unavailability rate of the nuclear power plant is determined according to the initial unavailability rate.

3. The method according to claim 2, characterized in that Also includes: The planned outages are classified into standard refueling overhaul, five-year overhaul, and ten-year overhaul.

4. The method according to claim 3, characterized in that The historical reference data corresponding to the standard refueling overhaul include the duration of outages for refueling and overhaul, and the number of outages for refueling and overhaul within 20 years; the historical reference data corresponding to the five-year overhaul include the duration of outages for overhaul of steam turbine generator sets, and the number of outages for overhaul of steam turbine generator sets within 20 years; the historical reference data corresponding to the ten-year overhaul include the duration of in-service inspection outages, and the number of in-service inspection outages within 20 years; the historical reference data corresponding to the unplanned outage include the average annual number of forced outage days; the historical reference data corresponding to the startup compromise time include the number of days of unit availability loss converted from start-up to 100% power; the historical reference data corresponding to the reserved maneuvering time include the number of days reserved for special matters within 20 years.

5. The method according to claim 4, characterized in that Determining the total unavailability rate of the nuclear power plant according to the initial unavailability rate includes: According to the initial unavailability rate, the total unavailability rate of the nuclear power plant is determined by formula 1, wherein: in, is the unavailability rate of the nuclear power plant under the standard refueling and overhaul, K1 is the number of refueling and overhaul outages within 20 years, I1 is the duration of refueling and overhaul outages, is the unavailability rate of the nuclear power plant under the five-year overhaul, K2 is the number of overhaul outages of the steam turbine generator set within 20 years, I2 is the duration of the overhaul outage of the steam turbine generator set, is the unavailability rate of the nuclear power plant under the ten-year overhaul, K3 is the number of shutdowns for in-service inspections within 20 years, I3 is the duration of shutdowns for in-service inspections; I4 is the average annual number of forced shutdown days, I5 is the number of days reserved for special matters within 20 years, and I6 is the number of days of unit availability loss from startup to 100% power conversion.

6. The method according to any one of claims 3 to 5, characterized in that: The unavailability rate indicator of the planned outage is reallocated based on the unavailability rate target value, including: Based on the unavailability target value, the overall unavailability index of each type of planned outage is reallocated, including the overall unavailability index allocation of the standard refueling overhaul, the overall unavailability index allocation of the five-year overhaul, and the overall unavailability index allocation of the ten-year overhaul; Based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated respectively, including allocation of unavailability indexes for each window within the planned outage and allocation of unavailability indexes for each task under each window.

7. The method according to claim 6, characterized in that Based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed, including: Based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed by an equal proportion allocation method. The equal proportion allocation method corresponds to Formula 2: in, is the overall unavailability index for various types of planned outages, is the target value of the unavailability rate of the nuclear power plant, A i is the initial unavailability rate of the nuclear power plant under various planned outages.

8. The method according to claim 6, characterized in that Based on the reallocated overall unavailability index, the unavailability indexes in each type of planned outage are allocated respectively, including: Determining the total target allocation value of each type of planned outage window based on the reallocated overall unavailability rate indicator; Determining a target allocation value for each window according to the total target allocation value of the window; The unavailability rate indicator of each key task in each window is allocated according to the target allocation value of each window.

9. The method according to claim 8, characterized in that Determining a target allocation value for each window according to the target allocation total value of the window includes: Determine potential optimization directions of the window and influencing factors corresponding to each potential optimization direction; Setting the initial weight of each potential optimization direction in each window; Determine the actual weight of each window based on the influencing factor and the initial weight; Obtaining the initial allocation value of each window; According to the initial allocation value of each window and the actual weight, the target allocation value of each window is determined by formula 3, wherein: in, is the target availability of the i-th window, ΔT * is the difference between the initial allocation total value and the target allocation total value of each type of planned outage window, w i is the actual weight of the i-th window, T i is the duration corresponding to the i-th window.

10. The method according to claim 8, characterized in that Allocating the unavailability rate index of each key task in each window according to the target allocation value of each window includes: identifying key tasks within each of the windows; Based on the optimization potential of the key tasks, setting an initial weight value for each key task; Based on the initial weight value of each key task and the target allocation value of each window, the unavailability rate index of each key task in each window is allocated using Formula 4, wherein: in, is the unavailability rate indicator of the jth key task in the i-th window, Assign a value to the target of the i-th window, is the initial weight value of the jth key task in the i-th window, is the initial allocation value of the jth key task in the i-th window.

11. The method according to claim 10, characterized in that Identify key tasks within each window, including: The time margin value of each task in each window is obtained, and the task with the time margin value of zero is regarded as a key task.

12. A device for allocating unavailability indexes for planned outages of nuclear power plants, characterized in that: include: An acquisition module, used for acquiring influencing factors of the unavailability rate of the nuclear power plant, wherein the influencing factors include one or more of planned outage, unplanned outage, startup compromise time, and reserved maneuvering time; A determination module, used to determine the total unavailability rate of the nuclear power plant under the influencing factors; A judging module, used for judging whether the sum of the unavailability rates is greater than the unavailability target value of the nuclear power plant; An allocation module is configured to reallocate the unavailability index of the planned outage based on the unavailability target value if the total unavailability rate is greater than the unavailability target value.

13. The device according to claim 12, characterized in that The determining module is used to: Obtain historical reference data corresponding to each influencing factor; Based on the historical reference data, respectively determining the initial unavailability rate of the nuclear power plant under the various influencing factors; The total unavailability rate of the nuclear power plant is determined according to the initial unavailability rate.

14. The device according to claim 13, characterized in that Also includes: The classification module is used to classify the planned outages, wherein the planned outages include standard refueling overhaul, five-year overhaul, and ten-year overhaul.

15. The device according to claim 14, characterized in that The historical reference data corresponding to the standard refueling overhaul include the duration of outages for refueling and overhaul, and the number of outages for refueling and overhaul within 20 years; the historical reference data corresponding to the five-year overhaul include the duration of outages for overhaul of steam turbine generator sets, and the number of outages for overhaul of steam turbine generator sets within 20 years; the historical reference data corresponding to the ten-year overhaul include the duration of in-service inspection outages, and the number of in-service inspection outages within 20 years; the historical reference data corresponding to the unplanned outage include the average annual number of forced outage days; the historical reference data corresponding to the startup compromise time include the number of days of unit availability loss converted from start-up to 100% power; the historical reference data corresponding to the reserved maneuvering time include the number of days reserved for special matters within 20 years.

16. The device according to claim 15, characterized in that Determining the total unavailability rate of the nuclear power plant according to the initial unavailability rate includes: According to the initial unavailability rate, the total unavailability rate of the nuclear power plant is determined by formula 1, wherein: in, is the unavailability rate of the nuclear power plant under the standard refueling and overhaul, K1 is the number of refueling and overhaul outages within 20 years, I1 is the duration of refueling and overhaul outages, is the unavailability rate of the nuclear power plant under the five-year overhaul, K2 is the number of overhaul outages of the steam turbine generator set within 20 years, I2 is the duration of the overhaul outage of the steam turbine generator set, is the unavailability rate of the nuclear power plant under the ten-year overhaul, K3 is the number of shutdowns for in-service inspections within 20 years, I3 is the duration of shutdowns for in-service inspections; I4 is the average annual number of forced shutdown days, I5 is the number of days reserved for special matters within 20 years, and I6 is the number of days of unit availability loss from startup to 100% power conversion.

17. The device according to any one of claims 14 to 16, characterized in that The allocation module is used to: Based on the unavailability target value, the overall unavailability index of each type of planned outage is reallocated, including the overall unavailability index allocation of the standard refueling overhaul, the overall unavailability index allocation of the five-year overhaul, and the overall unavailability index allocation of the ten-year overhaul; Based on the reallocated overall unavailability index, the unavailability indexes within each type of planned outage are allocated respectively, including allocation of unavailability indexes for each window within the planned outage and allocation of unavailability indexes for each task under each window.

18. The device according to claim 17, characterized in that Based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed, including: Based on the unavailability target value, the overall unavailability index of each type of planned outage is redistributed by an equal proportion allocation method. The equal proportion allocation method corresponds to Formula 2: in, is the overall unavailability index for various types of planned outages, is the target value of the unavailability rate of the nuclear power plant, A i is the initial unavailability rate of the nuclear power plant under various planned outages.

19. The device according to claim 17, characterized in that Based on the reallocated overall unavailability index, the unavailability indexes in each type of planned outage are allocated respectively, including: Determining the total target allocation value of each type of planned outage window based on the reallocated overall unavailability rate indicator; Determining a target allocation value for each window according to the total target allocation value of the window; The unavailability rate indicator of each key task in each window is allocated according to the target allocation value of each window.

20. The device according to claim 19, characterized in that Determining a target allocation value for each window according to the target allocation total value of the window includes: Determine potential optimization directions of the window and influencing factors corresponding to each potential optimization direction; Setting the initial weight of each potential optimization direction in each window; Determine the actual weight of each window based on the influencing factor and the initial weight; Obtaining the initial allocation value of each window; According to the initial allocation value of each window and the actual weight, the target allocation value of each window is determined by formula 3, wherein: in, is the target availability of the i-th window, ΔT * is the difference between the initial allocation total value and the target allocation total value of each type of planned outage window, w i is the actual weight of the i-th window, T i is the duration corresponding to the i-th window.

21. The device according to claim 19, characterized in that Allocating the unavailability rate index of each key task in each window according to the target allocation value of each window includes: identifying key tasks within each of the windows; Based on the optimization potential of the key tasks, setting an initial weight value for each key task; Based on the initial weight value of each key task and the target allocation value of each window, the unavailability rate index of each key task in each window is allocated using Formula 4, wherein: in, is the unavailability rate indicator of the jth key task in the i-th window, Assign a value to the target of the i-th window, is the initial weight value of the jth key task in the i-th window, is the initial allocation value of the jth key task in the i-th window.

22. The device according to claim 21, characterized in that Identify key tasks within each window, including: The time margin value of each task in each window is obtained, and the task with the time margin value of zero is regarded as a key task.

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