Nuclear power plant operation plan creation support device, operation plan creation support method, and program

Abstract

To support making of an operation plan to perform a load follow-up operation on the basis of the state of the core center of a nuclear power plant.SOLUTION: A device for supporting making of a plan to operate a nuclear power plant includes an operation plan acquisition unit, a core center state calculation unit, and an operation plan determination unit. The operation plan acquisition unit acquires an operation plan for the nuclear power plant for a first operation cycle including a load follow-up operation period. The core center state calculation unit calculates the state of the core center of the nuclear power plant in a second operation cycle executed before the first operation cycle. The operation plan determination unit determines whether the operation plan can be executed for the nuclear power plant on the basis of the state of the core center.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an operation plan creation support device, an operation plan creation support method, and a program for a nuclear power plant. [Background technology]

[0002] In recent years, renewable energy power generation businesses that generate electricity using renewable energy such as wind, solar, hydroelectric, and geothermal energy have been expanding. In power generation using renewable energy, the amount of power generation is prone to fluctuate with changes in environmental conditions, etc., and in order to adjust the balance between supply and demand of electricity, adjustment capability is ensured by operating other power plants in a load-following manner in response to fluctuations in the amount of power generated by renewable energy. For example, Patent Document 1 discloses a technology related to control for operating a thermal power plant in a load-following manner in response to fluctuations in the amount of power generated by renewable energy. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-108493 A Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, thermal power plants are increasingly operating in load-following mode in response to fluctuations in the amount of power generated by renewable energy sources. However, nuclear power plants are basically operated to maintain rated output because they have low power generation costs and can generate power stably day and night. In recent years, despite the need to ensure adjustment capacity due to the further introduction of renewable energy sources in line with growing environmental awareness, the number of thermal power plants is decreasing due to decarbonization and worsening profitability, and it is therefore an issue to seek new solutions to deal with load following due to fluctuations in the amount of power generated by renewable energy sources instead of thermal power plants. In such cases, one option is to perform load-following operation in response to fluctuations in the amount of power generated by renewable energy sources, even for nuclear power plants that have traditionally been operated to basically maintain rated output as described above.

[0005] In nuclear power plants, load-following operation based on a preset operation plan over a relatively long period of time has been assumed in accordance with fluctuations in the balance between power supply and demand during the day and night, for example. However, fluctuations in the amount of power generated from renewable energy occur on a shorter time scale. Since the performance of the load-following operation of a nuclear power plant depends on the core state and the plant behavior, it is necessary to create an operation plan for the nuclear power plant in advance based on the fluctuations in the amount of power generated from renewable energy, and to perform load-following operation of the nuclear power plant according to the operation plan. However, it is not easy to create an operation plan that a nuclear power plant can handle.

[0006] At least one embodiment of the present disclosure has been made in consideration of the above-mentioned circumstances, and has an object to provide an operation plan creation support device, an operation plan creation support method, and a program for a nuclear power plant that are capable of supporting the creation of an operation plan for load following operation in consideration of the core state of the nuclear power plant. [Means for solving the problem]

[0007] In order to solve the above problems, an operation plan creation support device for a nuclear power plant according to at least one embodiment of the present disclosure includes: an operation plan acquisition unit for acquiring an operation plan for the nuclear power plant, the operation plan corresponding to the first operation cycle and including a load following operation period; a core state calculation unit for calculating a core state of the nuclear power plant in a second operation cycle that is performed before the first operation cycle; an operation plan determination unit for determining whether or not the operation plan can be implemented in the nuclear power plant based on the core state; Equipped with.

[0008] In order to solve the above problems, a method for supporting creation of an operation plan for a nuclear power plant according to at least one embodiment of the present disclosure includes: obtaining an operational plan for the nuclear power plant corresponding to a first operational cycle and including a load following operation period; Calculating a core state of the nuclear power plant in a second operation cycle that is performed before the first operation cycle; determining whether or not the operation plan can be implemented in the nuclear power plant based on the core state; Equipped with.

[0009] In order to solve the above problem, a program according to at least one embodiment of the present disclosure includes: Using a computer, obtaining an operational plan for the nuclear power plant corresponding to a first operational cycle and including a load following operation period; Calculating a core state of the nuclear power plant in a second operation cycle that is performed before the first operation cycle; determining whether or not the operation plan can be implemented in the nuclear power plant based on the core state; It is possible to achieve this. Effect of the Invention

[0010] According to at least one embodiment of the present disclosure, it is possible to provide an operation plan creation support device, an operation plan creation support method, and a program for a nuclear power plant that are capable of supporting the creation of an operation plan for load following operation taking into account the core state of the nuclear power plant. [Brief description of the drawings]

[0011] [Figure 1] 1 is an example of an operation plan created for a nuclear power plant. [Diagram 2] FIG. 2 is a diagram showing a time schedule from the creation of the operation plan in FIG. 1 to its application to the actual operation of the nuclear power plant. [Diagram 3] 1 is a block diagram showing a configuration of an operation plan creation support device according to an embodiment; [Figure 4] 1 is a schematic configuration diagram of a nuclear power plant according to an embodiment; [Diagram 5] 1 is a flowchart illustrating a method for supporting creation of a management plan according to an embodiment. [Figure 6] FIG. 6 is a diagram showing a first alternative plan created in step S8 of FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure.

[0013] The operation plan creation support device according to at least one embodiment of the present disclosure is a device for supporting the creation of an operation plan for a nuclear power plant set for each operation cycle. The electric power generated by the nuclear power plant is supplied to an external power grid (not shown), and the power grid also supplies power generated by power plants using other energies including renewable energy. Since the power generation amount of renewable energy is likely to vary depending on environmental conditions and the like, in a nuclear power plant, an operation plan suitable for ensuring the supply-demand balance of the power grid is desired.

[0014] FIG. 1 is an example of an operation plan OP created for a nuclear power plant. The operation plan OP is defined as a time schedule of the output P (power generation amount (MWh)) of the nuclear power plant in the operation cycle C. In the present embodiment, the operation cycle is set to one day (24 hours), and the time change of the output P of the nuclear power plant during the operation cycle is defined.

[0015] The operation plan OP shown in FIG. 1 includes a first period T1 to a fourth period T4. In the first period T1, the output P of the nuclear power plant is maintained at a first output P1 corresponding to the rated output, and for example, it is a time zone corresponding to the night when the power generation amount by renewable energy decreases. In the second period T2, the output P of the nuclear power plant decreases from the first output P1 to a second output P2 (<P1) at a predetermined first output change rate ΔP1 (<0), and for example, it is a time zone that shifts to the daytime when the power generation amount by renewable energy increases. In the third period T3, the output P of the nuclear power plant is maintained at a second output P2 corresponding to the partial output, and for example, it is a time zone corresponding to the daytime when the power generation amount by renewable energy decreases. The fourth period T4 is a time zone in which the output P of the nuclear power plant increases from the second output P2 to the first output P1 at a predetermined second output change rate ΔP2 (>0), and for example, it is a time zone that shifts to the night when the power generation amount by renewable energy decreases. Such an operation plan OP can be specified by an output change width Pw (the difference between the first output P1 and the second output P2), an output change rate Pr, and a partial output time Pt (the time width maintained at the second output P2).

[0016] Figure 2 is a diagram showing the time schedule from the creation of the operation plan OP in Figure 1 to its application to the actual operation of the nuclear power plant. In a nuclear power plant, an operation plan is created in advance for each operation cycle, and operations are carried out according to the operation plan. For example, the operation plan OP corresponding to the first operation cycle C1 needs to be created sufficiently before the start timing of the first operation cycle C1.

[0017] Generally, the operation plan OP is created by the electric power company that operates the nuclear power plant, but a certain period of time (e.g., the period for bidding on the electricity market and for it to be agreed) is required before the operation plan is actually implemented in the nuclear power plant after the electric power company evaluates and determines whether the operation plan OP can be implemented. Therefore, the operation plan needs to be created sufficiently before the start timing of the first operation cycle C1, taking these periods into consideration. In this embodiment, the operation plan OP corresponding to the first operation cycle C1 is created in the second operation cycle C2 immediately before the first operation cycle C1, but it may be created in an operation cycle prior to the second operation cycle C2.

[0018] In this way, the operation plan OP corresponding to the first operation cycle C1 is created in advance, and it is necessary to determine whether it can be implemented in an actual nuclear power plant. This can be suitably performed by the operation plan creation support device 100 described below. The operation plan creation support device 100 is configured as an arithmetic processing device such as a computer, and more specifically, is configured with a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program, for example, and the CPU reads this program into the RAM or the like and executes information processing and arithmetic processing to realize various functions. The program may be installed in a ROM or other storage medium in advance, provided in a state stored in a computer-readable storage medium, or distributed via a wired or wireless communication means. The computer-readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

[0019] 3 is a block diagram showing a configuration of an operation plan creation support device 100 according to an embodiment. The operation plan creation support device 100 includes an operation plan acquisition unit 110, a core state calculation unit 120, a plant behavior calculation unit 130, an operation plan determination unit 140, and an alternative plan creation unit 150.

[0020] The operation plan acquisition unit 110 is configured to acquire an operation plan OP of the nuclear power plant. The operation plan described above with reference to Fig. 1 is created in advance by the electric power company and converted into electronic data. This data is input to the operation plan creation support device 100, whereby the operation plan acquisition unit 110 acquires the plan.

[0021] The core state calculation unit 120 is a component for calculating the core state of the nuclear power plant. The core state calculation unit 120 acquires process data of the nuclear power plant and calculates the core state based on the process data. The process data is acquired as detection signals and control signals of sensors installed in the nuclear power plant, and is input to a predetermined function to obtain the core state.

[0022] Here, Fig. 4 is a schematic diagram of a nuclear power plant 1 according to an embodiment. The nuclear power plant 1 shown in Fig. 4 is a plant having a pressurized water reactor (PWR) as a nuclear reactor 2 for generating steam by thermal energy generated by a nuclear fission reaction, but in other embodiments, the nuclear reactor 2 may be a boiling water reactor (BWR), or may be a type of nuclear reactor that uses a substance other than light water as a moderator or coolant, unlike light water reactors including pressurized water reactors and boiling water reactors.

[0023] The reactor 2 includes a primary cooling loop 4 through which primary cooling water flows, a reactor vessel 6 (pressure vessel) provided in the primary cooling loop 4, a pressurizer 8, a steam generator 10, and a primary cooling water pump 12. The primary cooling water pump 12 is configured to circulate the primary cooling water in the primary cooling loop 4. The pressurizer 8 is configured to pressurize the primary cooling water in the primary cooling loop 4 so that the primary cooling water does not boil. The reactor vessel 6, the pressurizer 8, the steam generator 10, and the primary cooling water pump 12 that constitute the reactor 2 in this manner are contained in a reactor containment vessel 13.

[0024] The reactor vessel 6 contains fuel rods 14 containing pellet-shaped nuclear fuel (e.g., uranium fuel, MOX fuel, etc.), and the primary cooling water in the reactor vessel 6 is heated by thermal energy generated by the nuclear fission reaction of this fuel. The reactor vessel 6 is provided with control rods 16 for absorbing and adjusting the number of neutrons generated in the core containing the nuclear fuel in order to control the reactor power. The primary cooling water heated in the reactor vessel 6 is sent to the steam generator 10, and the secondary cooling water flowing in the secondary cooling loop 18 is heated by heat exchange to generate steam.

[0025] The steam generated in the steam generator 10 drives and rotates a steam turbine (not shown) outside the reactor vessel 6 via a secondary cooling loop 18. As a result, the work of the steam turbine is output as electrical energy and supplied to a predetermined power system.

[0026] The primary cooling loop 4 is also provided with a purification line 26 including a demineralizer 20, a volume control tank 22, and a filling pump 24. The purification line 26 is provided to bypass the primary cooling loop 4, extending from between the steam generator 10 and the primary cooling water pump 12 to between the primary cooling water pump 12 and the reactor vessel 6. The demineralizer 20 removes inorganic salts from the cooling water taken in from the primary cooling loop 4. The volume control tank 22 adjusts the amount of cooling water circulating through the primary cooling loop 4 by storing a portion of the cooling water taken in the purification line 26 from the primary cooling loop 4. The filling pump 24 adjusts the flow rate of the cooling water flowing through the purification line 26.

[0027] When a nuclear power plant 1 having such a configuration is the target, the process data input to the core state calculation unit 120 are, for example, reactor thermal power, control rod position, and coolant temperature, and the axial power distribution is calculated as a state quantity indicating the core state.

[0028] The plant behavior calculation unit 130 is a component for calculating the behavior of the nuclear power plant based on the core state calculated by the core state calculation unit 120. The calculation target of the plant behavior calculation unit 130 may be the behavior of each component included in the nuclear power plant 1, but in a nuclear power plant 1 having a pressurized water reactor as shown in Fig. 4, the plant behavior calculation unit 130 may calculate the behavior of each component included in the primary cooling loop 4, which is a primary cooling system. Specifically, the plant behavior calculation unit 130 calculates the behavior of the reactor vessel 6, pressurizer 8, steam generator 10, and primary cooling water pump 12 that constitute the primary cooling loop 4, the demineralizer 20, volume control tank 22, and filling pump 24 that constitute the purification line 26, and the piping that connects these, etc.

[0029] The operation plan determination unit 140 is configured to determine whether or not the operation plan acquired by the operation plan acquisition unit 110 is executable. In the determination by the operation plan determination unit 140, at least the core state calculated by the core state calculation unit 120 is taken into consideration, and further, the plant behavior calculated by the plant behavior calculation unit 130 may also be taken into consideration. An operation plan OP that is determined to be executable by the operation plan determination unit 140 is adopted as is, whereas an operation plan OP that is determined to be infeasible is not adopted.

[0030] The alternative plan creation unit 150 is configured to create an alternative plan AP to replace the operation plan OP when the operation plan determination unit 140 determines that the operation plan OP acquired by the operation plan acquisition unit 110 cannot be implemented. The alternative plan AP may be created by modifying the operation plan OP determined to be unable to be implemented as described below, or may be a plan corresponding to a non-load following operation in which rated operation is maintained as in a typical nuclear power plant 1 by abandoning load following operation in which the load changes over time.

[0031] Next, a description will be given of an operation plan creation support method implemented by the operation plan creation support device 100 having the above configuration. Fig. 5 is a flowchart showing an operation plan creation support method according to an embodiment. Fig. 5 exemplarily describes a case in which creation of an operation plan corresponding to a future first operation cycle C1 is supported at the time of the second operation cycle C2.

[0032] First, the operation plan acquisition unit 110 acquires the operation plan OP to be judged (step S1). As described above with reference to Fig. 1, the operation plan OP acquired in step S1 is acquired as electronic data prepared by, for example, a power generation company as a time change of the output of the nuclear power plant 1 in the first operation cycle C1 in the future relative to the present (a point in time included in the second operation cycle C2).

[0033] Next, the core state calculation unit 120 acquires process data from the nuclear power plant 1 (step S2), and calculates the core state based on the process data (step S3). This allows the core state at a time point included in the second operation cycle C2 to be calculated. The plant behavior calculation unit 130 calculates the plant behavior based on the core state calculated in step S3 (step S4).

[0034] Next, the operation plan determination unit 140 determines whether the operation plan OP acquired in step S1 is executable (step S5). In step S5, at least the core state calculated in step S3 is taken into consideration, and the plant behavior calculated in step S4 may also be taken into consideration.

[0035] More specifically, the judgment in step S5 is made based on, for example, whether or not the power change width Pw (the difference between the first power P1 and the second power P2), the power change rate Pr, and the partial power time Pt ​​(the time width during which the second power P2 is maintained), which are characteristic quantities of the operation plan OP, are within the specification ranges specified by the core state and plant behavior of the nuclear power plant 1. In addition to the specification ranges that are predefined, a predetermined likelihood may be taken into consideration in this judgment. In this way, the operation plan judgment unit 140 judges whether or not the operation plan corresponding to the first operation cycle C1 created by the power generation company or the like can be implemented based on the core state of the second operation cycle C2.

[0036] If it is determined that the operation plan OP is executable (step S5: YES), the operation plan creation support device 100 adopts the operation plan OP acquired in step S1 as is (step S6). On the other hand, if it is determined that the operation plan OP is not executable (step S5: NO), the alternative plan creation unit 150 rejects the operation plan OP acquired in step S1 (step S7) and creates an alternative plan AP (step S8).

[0037] In step S8, the alternative plan creation unit 150 creates at least one alternative plan AP. In this embodiment, the alternative plan creation unit 150 creates a first alternative plan AP1 and a second alternative plan AP2 that are mutually selectable as the multiple alternative plans AP.

[0038] The first alternative plan AP1 is created by changing the output change rate of the operation plan OP acquired by the operation plan acquisition unit 110 in step S1 so that it falls within the specification range of the nuclear power plant. FIG. 6 is a diagram showing the first alternative plan AP1 created in step S8 of FIG. 5. In this example, the operation plan OP is based on the operation plan OP that was determined to be infeasible in step S5 because the output change rate Pr in the fourth period T4 was out of the specification range, and the first alternative plan AP1 is created by changing the output change rate Pr in the fourth period T4, which was the cause of the determination that the operation plan was infeasible, so that it falls within the specification range (in FIG. 6, the operation plan OP before the change shown in FIG. 1 is shown by a broken line). In this case, the first alternative plan AP1 may be created by changing the output change rate Pr in the fourth period T4 of the base operation plan OP by a predetermined value at a time and searching for a value that falls within the specification range.

[0039] The second alternative plan AP2 is specified so that rated operation is continuously performed in the nuclear power plant 1. In other words, the second alternative plan AP2 is not a plan for performing load-following operation like the above-mentioned operational plan OP or the first alternative plan AP1, but is a plan for dealing with the case where load-following operation is abandoned.

[0040] In this way, when the first alternative plan AP1 and the second alternative plan AP2 are created in step S8, the operation plan creation support device 100 first judges whether the first alternative plan AP1 can be implemented in the nuclear power plant 1 when selected (step S9). The judgment of whether the first alternative plan AP can be implemented in step S9 can be performed following the above-mentioned step S5. As a result, when it is judged that the first alternative plan AP1 is implementable (step S9: YES), the operation plan creation support device 100 adopts the first alternative plan AP1 (step S10). On the other hand, when it is judged that the first alternative plan AP1 is not implementable (step S9: NO), the operation plan creation support device 100 adopts the second alternative plan AP2 (step S11).

[0041] In this way, when the original operation plan OP cannot be implemented, the operation plan creation support device 100 determines whether or not the first alternative plan AP1, which attempts load following operation while modifying the operation plan OP, can be implemented. If the first alternative plan AP1 cannot be implemented, the operation plan creation support device 100 adopts the second alternative plan AP2, which abandons load following operation. This makes it possible to efficiently search for a load following operation close to the original operation plan OP.

[0042] As described above, according to each of the above embodiments, whether or not an operation plan corresponding to a future first operation cycle is executable is determined based on the core state in the second operation cycle executed before the first operation cycle. This makes it possible to appropriately determine the feasibility of an operation plan including a load following operation based on the core state, and to support the creation of an operation plan that is executable in a nuclear power plant.

[0043] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate.

[0044] The contents described in each of the above embodiments can be understood, for example, as follows.

[0045] (1) A nuclear power plant operation plan creation support device (100) according to one aspect, an operation plan acquisition unit (110) for acquiring an operation plan (OP) of the nuclear power plant, the operation plan (OP) corresponding to a first operation cycle (C1) and including a load following operation period; a core state calculation unit (120) for calculating a core state of the nuclear power plant in a second operation cycle (C2) performed before the first operation cycle; an operation plan determination unit (140) for determining whether or not the operation plan can be implemented in the nuclear power plant based on the core state; Equipped with.

[0046] According to the above aspect (1), whether or not an operation plan corresponding to a first operation cycle is executable is determined based on the core state in a second operation cycle executed before the first operation cycle. This makes it possible to appropriately determine the feasibility of an operation plan including a load following operation based on the core state, and to support the creation of an operation plan that is executable in a nuclear power plant.

[0047] (2) In another embodiment, in the above embodiment (1), a plant behavior calculation unit (130) for calculating a behavior of the nuclear power plant in the first operation cycle based on the operation plan and the core state, The operation plan determination unit determines whether or not the operation plan can be implemented based on the behavior.

[0048] According to the above aspect (2), the behavior of the nuclear power plant in the first operation cycle is calculated based on the core state. In determining the operation plan, by taking into account the behavior of the nuclear power plant calculated in this way in addition to the above-mentioned core state, it is possible to more appropriately determine whether or not the operation plan corresponding to the future first operation cycle is executable.

[0049] (3) In another embodiment, in the above embodiment (2), the nuclear power plant includes a pressurized water reactor; The plant behavior calculation unit calculates the behavior of a primary cooling system including the pressurized water reactor.

[0050] According to the above aspect (3), in a nuclear power plant having a pressurized water reactor (PWR), by taking into account the behavior of the primary cooling system, it is possible to more appropriately determine whether or not an operation plan corresponding to a future first operation cycle is feasible.

[0051] (4) In another embodiment, in any one of the above (1) to (3), The core state calculation unit calculates the core state based on process data obtained from the nuclear power plant in the second operation cycle.

[0052] According to the above aspect (4), the core state in the second operation cycle can be suitably calculated using the process data obtained from the nuclear power plant in the second operation cycle.

[0053] (5) In another embodiment, in any one of the above (1) to (4), The operation plan determination unit makes a determination based on whether or not the axial power distribution specified by the core state is within an allowable range.

[0054] According to the above aspect (5), it is possible to more appropriately determine whether or not the operation plan corresponding to the future first operation cycle is feasible, based on the core state of the nuclear power plant identified based on the axial power distribution.

[0055] (6) In another embodiment, in any one of the above (1) to (5), The system further includes an alternative plan creation unit for creating an alternative plan to the operation plan when the operation plan determination unit determines that the operation plan cannot be implemented.

[0056] According to the above aspect (6), when it is determined that the acquired operation plan cannot be implemented, an alternative plan is created, thereby making it possible to suitably propose an operation plan for performing load following operation.

[0057] (7) In another embodiment, in the above embodiment (6), The alternative plan creation unit creates, as the alternative plan, a first alternative plan in which an output change rate of the operation plan is changed so as to be within a specification range of the nuclear power plant.

[0058] According to the above aspect (7), the first alternative plan is created by changing the output change rate in the operation plan that is determined to be unfeasible so that the output change rate falls within the specification range of the nuclear power plant. This makes it possible to appropriately create a feasible alternative plan based on the original operation plan.

[0059] (8) In another embodiment, in the above embodiment (7), When the first alternative plan cannot be created, the alternative plan creation unit is capable of selecting, as the alternative plan, a second alternative plan in which rated operation is continuously performed in the nuclear power plant.

[0060] According to the above aspect (8), when it is difficult to create a first alternative plan by changing the output change rate in the operation plan that is determined to be unfeasible, a second alternative plan, which involves continuing rated operation, can be proposed as the alternative plan.

[0061] (9) A method for supporting creation of an operation plan for a nuclear power plant according to one embodiment includes the steps of: obtaining an operation plan (OP) for the nuclear power plant, the operation plan (OP) corresponding to a first operation cycle (C1) and including a load following operation period; Calculating a core state of the nuclear power plant in a second operation cycle (C2) performed before the first operation cycle; determining whether or not the operation plan can be implemented in the nuclear power plant based on the core state; Equipped with.

[0062] According to the above aspect (9), whether or not an operation plan corresponding to a first operation cycle is executable is determined based on the core state in a second operation cycle executed before the first operation cycle. This makes it possible to appropriately determine the feasibility of an operation plan including a load following operation based on the core state, and to support the creation of an operation plan that is executable in a nuclear power plant.

[0063] (10) A program according to one embodiment of the present invention comprises: Using a computer, obtaining an operation plan (OP) for the nuclear power plant, the operation plan (OP) corresponding to a first operation cycle (C1) and including a load following operation period; Calculating a core state of the nuclear power plant in a second operation cycle (C2) performed before the first operation cycle; determining whether or not the operation plan can be implemented in the nuclear power plant based on the core state; It is possible to achieve this.

[0064] According to the above aspect (10), whether or not an operation plan corresponding to a first operation cycle is executable is determined based on the core state in a second operation cycle executed before the first operation cycle. This makes it possible to appropriately determine the feasibility of an operation plan including a load following operation based on the core state, and to support the creation of an operation plan that is executable in a nuclear power plant. [Explanation of symbols]

[0065] 1. Nuclear power plants 2 nuclear reactor 4 Primary Cooling Loop 6 Reactor vessel 8 Pressurizer 10. Steam Generator 12 Primary cooling water pump 13. Nuclear Reactor Containment Vessel 14 fuel rod 16 Control Rods 18 Secondary Cooling Loop 20 Desalination tower 22 Volume Control Tank 24 Filling pump 26 Purification Line 100 Operational plan creation support device 110 Operational Plan Acquisition Department 120 Core State Calculation Unit 130 Plant behavior calculation unit 140 Operational Plan Judgment Department 150 Alternative Plan Creation Department AP Alternative Plan AP1 First Alternative Plan AP2 Second Alternative Plan C1 First Operational Cycle C2 2nd Operational Cycle OP Operation Plan

Claims

1. An operation plan creation support device for a nuclear power plant that is operated according to an operation plan that specifies an output time schedule for each operation cycle, comprising: an operation plan acquisition unit for acquiring the operation plan, which is created in advance before being applied to the nuclear power plant in response to a first operation cycle and includes a load following operation period, in a second operation cycle before the first operation cycle; a core state calculation unit for calculating a core state of the nuclear power plant in the second operation cycle; an operation plan determination unit for determining, prior to the first operation cycle, whether or not the operation plan can be implemented in the nuclear power plant based on the core state; An operation plan creation support device for a nuclear power plant, comprising:

2. a plant behavior calculation unit for calculating a behavior of the nuclear power plant in the first operation cycle based on the operation plan and the core state, 2 . The nuclear power plant operation plan creation support device according to claim 1 , wherein the operation plan determination unit determines whether or not the operation plan can be implemented based on the behavior before the first operation cycle.

3. the nuclear power plant includes a pressurized water reactor; 3. The nuclear power plant operation plan creation support device according to claim 2, wherein the plant behavior calculation unit calculates the behavior of a primary cooling system including the pressurized water reactor.

4. 4. The nuclear power plant operation plan creation support device according to claim 1, wherein the core state calculation unit calculates the core state based on process data obtained from the nuclear power plant in the second operation cycle.

5. 5. The nuclear power plant operation plan creation support device according to claim 1, wherein the operation plan determination unit makes a determination based on whether or not a feature amount of the operation plan is within a specification range of the nuclear power plant.

6. 6. The nuclear power plant operation plan creation support device according to claim 5, wherein the feature amount includes at least one of an output change width, an output change rate, or a partial output time in the operation plan.

7. An alternative plan creation unit for creating an alternative plan for the operation plan, 6. The nuclear power plant operation plan creation support device according to claim 1, wherein the operation plan determination unit adopts the alternative plan instead of the operation plan when it is determined that the operation plan cannot be implemented.

8. 8. The nuclear power plant operation plan creation support device according to claim 7, wherein the alternative plan creation unit creates, as the alternative plan, a first alternative plan in which an output change rate of the operation plan is changed so as to be within a specification range of the nuclear power plant.

9. 9. The nuclear power plant operation plan creation support device according to claim 8, wherein, when the first alternative plan cannot be adopted, the alternative plan creation unit adopts, as the alternative plan, a second alternative plan in which rated operation is continuously performed in the nuclear power plant.

10. 10. The nuclear power plant operation plan creation support device according to claim 1, wherein the operation plan is created in advance based on fluctuations in power demand balance in a power grid to which power generated by the nuclear power plant is supplied.

11. The nuclear power plant operation plan creation support device according to claim 10, wherein the power grid is supplied with electric power generated by renewable energy.

12. 1. A method for supporting creation of an operation plan for a nuclear power plant operated according to an operation plan that specifies a time schedule of output for each operation cycle, comprising: obtaining the operation plan, which is created in advance before being applied to the nuclear power plant in response to a first operation cycle, in a second operation cycle prior to the first operation cycle, the operation plan including a load following operation period; calculating a core state of the nuclear power plant in the second operation cycle; determining whether the operation plan can be implemented in the nuclear power plant based on the core state before the first operation cycle; The method for supporting creation of an operation plan for a nuclear power plant includes:

13. An operation plan creation support program for a nuclear power plant that is operated according to an operation plan that specifies an output time schedule for each operation cycle, comprising: Using a computer, obtaining the operation plan, which is created in advance before being applied to the nuclear power plant in response to a first operation cycle, in a second operation cycle prior to the first operation cycle, the operation plan including a load following operation period; calculating a core state of the nuclear power plant in the second operation cycle; determining whether the operation plan can be implemented in the nuclear power plant based on the core state before the first operation cycle; This is a program to assist in creating operational plans for nuclear power plants.

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