Nuclear power plant and method of operating the same

Abstract

This nuclear power generation equipment (1) is used as a black start power source when a station blackout occurs. The nuclear power generation equipment (1) comprises: a nuclear power plant (2) that can supply hydrogen to the outside; and a gas turbine plant (3) that can supply power to a load of the nuclear power plant (2) using hydrogen generated by the nuclear power plant (2) as fuel.

Description

[Technical field]

[0001] The present invention relates to a nuclear power plant and a method for operating a nuclear power plant. [Background technology]

[0002] In recent years, the rise of natural energy has increased the number of factors that cause instability in the power grid, and the possibility of large-scale blackouts is growing. If a large-scale, long-term blackout occurs, nuclear power plants will lose their external power source for a long period of time. In this case, nuclear power plants start up their on-site loads using electricity generated by hydroelectric power plants, etc., in order to restart the plant. Furthermore, nuclear power plants do not have the ability to actively contribute to resolving long-term blackout events.

[0003] Patent Document 1 describes an invention that starts up a gas turbine generator that serves as a black start power source during a station blackout (power outage) and supplies power to the high voltage side (primary side) of a startup transformer. Note that black start refers to generating power to resolve a power outage from a blackout state without receiving electricity generated from an external power source. A black start power source is a power source that generates power to resolve a power outage. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Application No. 1985-190529 Summary of the Invention [Problem to be solved by the invention]

[0005] The invention described in Patent Document 1 supplies black start power through a startup transformer by a gas turbine generator during a station blackout (long-term power outage) of the power system. To start up the thermal or nuclear power generator, the on-site equipment of the power plant (such as feedwater pumps and fans) must be operated, and to operate these, a relatively large supply of power is required, so the gas turbine generator used must be large. In this invention, the gas turbine generator is configured to be used only to supply power to the on-site power source of the thermal or nuclear power plant.

[0006] During normal times when there is a certain amount of power in the power grid, the large amount of power is stably supplied from the power grid. However, in a blackout state, there is no power in the power grid, so it is necessary to create stable power from scratch. However, conventionally, a nuclear power plant connected to a power grid could not be started up when an external power source is lost, and it could not be used as a black start power source. In addition, the configuration of Patent Document 1 allows a nuclear power plant to be used as a blackout power source, but the purpose of the gas turbine generator is determined to be to supply power to the on-site power source of a thermal power plant or a nuclear power plant. Therefore, an object of the present invention is to use a nuclear power generation facility as a black start power source during a station blackout. [Means for solving the problem]

[0007] In order to solve the above problems, the nuclear power generation facility of the present invention includes a nuclear power plant capable of supplying hydrogen to the outside, a control unit that shuts down the nuclear power plant when a power grid blackout occurs; Nuclear Power Plant Nuclear reactions that continue after the cessation of The hydrogen produced in the When the power grid is in a blackout state, and a gas turbine generator capable of supplying electric power to a load of the nuclear power plant.

[0008] The method for operating a nuclear power plant of the present invention comprises the steps of: a control unit that shuts down the nuclear power plant when a power grid blackout occurs; Nuclear power plants, Produced by nuclear reactions that continue after the reaction has stopped A step of supplying hydrogen to an outside, and a gas turbine generator are provided for the nuclear power plant. Nuclear reactions that continue after the cessation ofgenerating electricity using the hydrogen generated in the step (a) as fuel; and When the power grid is in a blackout state, and supplying power to a load of the nuclear power plant. Other means will be described in the description of the embodiment of the invention. Effect of the Invention

[0009] According to the present invention, it is possible to use a nuclear power generation facility as a black start power source during a station blackout. [Brief description of the drawings]

[0010] [Figure 1] 1 is a configuration diagram of a nuclear power generation facility according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic diagram of a nuclear power plant. [Diagram 3] 4 is a flowchart of a control process for a nuclear power plant and a gas turbine plant. [Figure 4] 13 is a flowchart of a process when a blackout is detected. [Diagram 5] 13 is a flowchart of a black start process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. To recover from a black start, first a generator capable of supplying power to the on-site equipment of a thermal or nuclear power plant must be started up using an even smaller power source. Only after multiple such generators are in place can they begin to supply power to the on-site equipment of a thermal or nuclear power plant.

[0012] Conventionally, to supply electricity to thermal power plants or nuclear power plants, electricity is first transmitted to the power lines, but when electricity is transmitted to the power lines when there is no electricity flowing, the voltage becomes high and there is a risk of damaging the equipment. For this reason, the voltage is constantly monitored and adjusted as the restoration proceeds.

[0013] FIG. 1 is a configuration diagram of a nuclear power generation facility 1 according to this embodiment. The nuclear power plant 1 includes a nuclear power plant 2, a gas turbine plant 3, switches 41-43, a main transformer 44, an on-site transformer 45, an on-site load 46, on-site wiring 47, and a control unit 5. The nuclear power plant 1 is configured by combining the nuclear power plant 2 and the gas turbine plant 3, which operates using fuel mainly made of hydrogen, in a direct connection to the low-voltage main circuit of the main transformer 44. The power generation capacity of the nuclear power plant 1 is the total capacity of the nuclear power plant 2 and the gas turbine plant 3. The load fluctuation required of the power grid 6 is responded to by changing the operating capacity of the gas turbine plant 3. The nuclear power plant 2 operates at rated capacity and supplies base power to the power grid 6, and also produces hydrogen to supply it as fuel for the gas turbine plant 3.

[0014] The nuclear power generation facility 1 supplies the sum of the electricity generated in the nuclear plant 2 and the electricity generated in the gas turbine plant 3 to the power grid 6, and also functions as a black start power source during a station blackout of the power grid 6.

[0015] The main transformer 44 is connected between the power system 6 and the on-site wiring 47, and has the function of converting the two AC voltages into each other. The switchgear 43 is connected between the high-voltage side of the main transformer 44 and the power system 6, and switches between conduction and cut-off between the two. The switchgear 41 is connected between the nuclear plant 2 and the on-site wiring 47 on the low-voltage side of the main transformer 44, and switches between conduction and cut-off between the two. The switchgear 42 is connected between the gas turbine plant 3 and the on-site wiring 47 on the low-voltage side of the main transformer 44, and switches between conduction and cut-off between the two. The switchgear 41 also has the function of synchronously operating the nuclear plant 2 and the power system 6. The switchgear 42 also has the function of synchronously operating the gas turbine plant 3 and the power system 6.

[0016] The on-site transformer 45 is connected between the on-site load 46 and the on-site wiring 47, and steps down the AC voltage of the on-site wiring 47 to an AC voltage required by the on-site load 46. The on-site load 46 refers to all kinds of equipment that needs to be operated, for example, at the start-up and normal operation of the nuclear plant 2. The on-site load 46 includes auxiliary equipment, which is on-site equipment for starting the generator, and on-site safety equipment that needs to be operated in the event of a plant accident or the like. The auxiliary equipment starts up the nuclear plant 2 or assists in the power generation of the nuclear plant 2. Furthermore, the auxiliary equipment starts up the nuclear plant 2 by receiving power supply and continues the power generation of the nuclear plant 2. The auxiliary equipment is, for example, a pump, a blower, or a valve.

[0017] To start the generator, it is necessary to supply power to the auxiliary equipment, which is the on-site equipment for starting the generator, and in particular, a power source larger than the rated power is required at the time of startup. On-site safety equipment is the minimum equipment necessary to protect human life and facilities, such as water injection pumps to maintain the safety of the reactor and emergency lights in the event of a power outage. The power required by on-site safety equipment is less than the power used to operate the auxiliary equipment.

[0018] The nuclear plant 2 comprises a reactor 23 that generates steam, a turbine 21 that is driven to rotate by the generated steam, and a generator 22 directly connected to the turbine 21. The reactor 23 of the nuclear plant 2 supplies hydrogen generated by utilizing the heat source of the reactor 23 to a gas turbine plant 3 located outside the nuclear plant 2. Note that there are other methods of generating hydrogen in the nuclear plant 2, such as using generated electricity, but the following description will be based on the method of generating hydrogen by utilizing the heat source of the reactor 23.

[0019] The gas turbine plant 3 includes an LNG (natural gas) tank 34, a hydrogen tank 36, and a mixer 35 that mixes the natural gas and hydrogen. The gas turbine plant 3 includes a gas turbine 31 that is rotated and driven using the mixed gas mixed in the mixer 35 as fuel, and a generator 32 that is directly connected to the gas turbine 31.

[0020] A gas turbine plant 3 obtains power by burning hydrogen and natural gas as fuel. A gas turbine 31 draws in a large amount of air and first compresses it in a compressor. Then, in a combustor, fuel is injected into the high-pressure air and burned. Finally, the high-temperature, high-pressure gas rotates the gas turbine 31, and power is extracted as rotational force to rotate a generator 32. In gas turbine power generation, the rotational force is used to rotate the shaft of the generator 32, and the rotational energy is converted into electricity. Part of the rotational force of the gas turbine 31 is also used to rotate the compressor. Because the turbine is rotated by high-temperature, high-pressure gas in this way, this device is called a gas turbine 31.

[0021] The hydrogen tank 36 stores hydrogen produced in the reactor 23. The gas turbine plant 3 generates electricity using the hydrogen produced in the reactor 23 as fuel, so the hydrogen produced in the nuclear plant 2 can be used as an energy source without waste. In addition, the gas turbine plant 3 has the capacity to supply power to an internal load 46 for starting up the nuclear plant 2.

[0022] The gas turbine plant 3 performs grid-connected operation connected to the power grid 6, and also performs independent operation connected to the on-site load 46. The gas turbine plant 3 is, for example, a plant that burns a mixed gas of hydrogen and natural gas to rotate a turbine and generate electricity. The gas turbine plant 3 can start up and generate electricity even when there is no grid power. This is called a black start. The power generated by the gas turbine plant 3 is sufficient to run the on-site load 46. This allows the nuclear plant 2 to be started up and a black start to be performed.

[0023] In this embodiment, the gas turbine plant 3 can be used as a backup power source for the nuclear power plant 1 during a long-term station blackout in the event of a large-scale disaster, and can supply electric power to the load 46 within the nuclear power plant 1.

[0024] The control unit 5 is, for example, an information processing device or computer equipped with a central processing unit, a storage device, and various interfaces. The control unit 5 controls the power generation operations of the nuclear power plant 2 and the gas turbine plant 3, and outputs various information related to the nuclear power plant 1, such as displaying, saving, and transmitting information showing the status of the nuclear power plant 2, the gas turbine plant 3, and the power system 6. This information may be output to equipment within the nuclear power plant 1, or may be output to equipment outside the nuclear power plant 1.

[0025] When a station blackout occurs, the control unit 5 operates the nuclear plant 2 in full bypass for a short period of time to wait for recovery. If the station blackout continues for a long period of time, the control unit 5 also shuts down the nuclear plant 2. The control unit 5 is connected to the central load dispatching center 9 so as to be able to communicate with it, and receives a notification of the occurrence of a blackout in the power grid 6, for example.

[0026] The Central Load Dispatch Center 9 has the following three roles in order to ensure a stable supply of electricity to users. The first role of the central load dispatching center 9 is to control the amount of electricity generated so that the amount of electricity used is equal to the amount of electricity generated, and to keep the frequency constant. If the balance between the amount of electricity used by users and the amount of electricity generated by power plants is lost, the frequency will be disrupted and electricity will not be supplied stably. For this reason, the central load dispatching center 9 predicts the amount of electricity used, which changes from moment to moment, and adjusts the amount of electricity generated by power plants accordingly, so as to keep the AC frequency at a specified value. The generated electricity is supplied to users via facilities such as power plants, transmission lines, substations, distribution lines, and service lines. The system consisting of all of these facilities combined is the power grid 6.

[0027] The second role of the Central Load Dispatch Center 9 is to grasp the overall situation of the power grid 6 in the power grid area of ​​the electric power company, which spans each prefecture, and to ensure the stable operation of the power grid 6 by controlling the electricity flowing therethrough.

[0028] The third role of the Central Load Dispatch Center 9 is to collect data such as meteorological information, which has a significant effect on electricity usage, data on electricity usage at any given time, and information on accidents at facilities in the power grid 6, and to transmit the necessary information promptly to the relevant parties. To ensure that these three roles are fulfilled, the Central Load Dispatch Center 9 controls the amount of electricity generated in line with electricity usage. However, the control unit 5 is not limited to this as long as it is configured to be able to detect the occurrence of a blackout in the power grid 6, and is not limited thereto.

[0029] When the power grid 6 is restored, the control unit 5 starts up the nuclear plant 2 using the power of the gas turbine plant 3. By starting up the large-capacity nuclear power generation facility 1 as soon as possible when the system is restored from a station blackout, the system can play a part in the early restoration of the power grid 6. In this embodiment, the load following capability of the nuclear power generation facility 1 to the power grid 6 is improved, and additional value such as support for station blackouts is also added.

[0030] <Power system black start procedure> A black start is the process of bringing the power grid back up and running after a blackout without relying on external transmission networks. During this time, renewable energy sources, which have fluctuating output, must be disconnected and hydroelectric and thermal power plants must be started up.

[0031] Specifically, during a black start of the power grid, hydroelectric power generation will be started first, and then nuclear and thermal power generation will be connected while increasing demand and supply while balancing supply and demand. In addition to hydroelectric power, small-scale gas turbines and other sources may also be used.

[0032] In this case, although large thermal power plants are not the first to start a black start, they have a large supply capacity and therefore are effective in the process of building up supply capacity. On the other hand, naturally variable renewable energy generators cannot be connected to the grid immediately because their "output" fluctuates. Generally, naturally variable renewable energy generators are connected after all other power generation facilities have been connected.

[0033] The steps for restoring a power system from a black start are as follows: (1) Start the emergency generator and supply on-site power to a power station with a black start power source. In some cases, this is done via a general hydroelectric generator. (2) Secure on-site electricity at the power plant that will serve as the starting point for the black start. (3) Activate black start power sources and gradually expand the power grid, utilizing phase modifying equipment, which has the function of keeping the grid stable, if necessary. (4) Paralleling the generators of other power plants while securing their on-site power supply. (5) Transmit power to the load.

[0034] FIG. 2 is a schematic configuration diagram of the nuclear power plant 2. Reactor 23 supplies steam to turbine 21 via piping and steam control valves 241, 242, and 243. Turbine 21 is driven to rotate by the steam supplied from reactor 23, causing generator 22 to generate electricity. The steam supplied to turbine 21 and steam passing through steam control valve 241 and turbine bypass valve 244 are condensed into water by condenser 25. Feedwater heater 26 heats the water in condenser 25. Feedwater pump 27 supplies the water from feedwater heater 26 and water supplied from the outside to reactor 23.

[0035] Furthermore, the turbine bypass valve 244 of the nuclear plant 2 has the capacity to allow 100% of the steam generated in the nuclear reactor (reactor 23) to flow into the condenser 25 for a short period of time, and the condenser 25 also has the capacity to convert the steam into water. Allowing 100% of the steam generated in the nuclear reactor to flow into the condenser 25 and multiplexing the steam is called full bypass operation. By performing full bypass operation when a blackout occurs in the power system 6, it is possible to maintain the operation of the nuclear plant 2. However, due to the capacity of the turbine bypass valve 244 and the condenser 25, it is impossible to continue full bypass operation for a long period of time.

[0036] The reactor 23 further includes an internal pump 28 for recirculating water within the reactor 23, and a control rod drive 29 for inserting control rods into the reactor 23 and controlling the insertion and withdrawal of the control rods into and from the fuel assemblies of the reactor 23. The pressure control system 52 controls the steam control valve 243 so that the reactor pressure and the turbine load become predetermined values.

[0037] The feedwater control system 55 controls the rotation speed of the feedwater pump 27 so that the water level in the reactor is within a predetermined range. The recirculation flow rate control system 53 adjusts the recirculation flow rate of the water in the core using the internal pump 28, and controls the amount of voids in the fuel assemblies, thereby controlling the reactor power. The control rod operation monitoring system 54 controls the number and insertion positions of control rods (CR) inserted into the fuel assemblies, thereby controlling the reactor power. The automatic power adjustment system 51 performs overall control of the reactor power and the load on the turbine 21. The control unit 5 in FIG. 1 is composed of the automatic power adjustment system 51, a pressure control system 52, a recirculation flow rate control system 53, a control rod operation monitoring system 54, and a feedwater control system 55.

[0038] FIG. 3 is a flowchart of the control process of the nuclear power plant 2 and the gas turbine plant 3. The control unit 5 performs the following steps S10 and S11 in parallel. The control unit 5 operates the nuclear power plant 2 to maintain a predetermined output (step S10). In parallel with this, the control unit 5 operates the gas turbine generator to follow the load of the system (step S11). The control unit 5 repeatedly executes the processes of steps S10 and S11.

[0039] As a result, the nuclear power plant 1 has a load following capability that satisfies the load operation requirements imposed by the power grid 6. In addition, by using the hydrogen gas generated in the reactor 23 of the nuclear power plant 2 as fuel for the gas turbine plant 3, it is possible to convert energy into electricity without waste overall.

[0040] FIG. 4 is a flowchart of the process when a blackout in the power system 6 is detected. When the control unit 5 detects the occurrence of a blackout in the power grid 6 (step S20), it starts the process of Fig. 4. Note that the control unit 5 may also start the process upon receiving a notification of the occurrence of a blackout in the power grid 6 from the central load dispatching center 9.

[0041] In response to a blackout occurrence signal from the power system 6, the control unit 5 opens the switch 43, controls the turbine bypass valve 244 of the nuclear plant 2 in the opening direction and the steam control valve 243 in the closing direction, and executes a process to rapidly reduce the steam to the turbine 21 side and increase the steam flow rate to the condenser 25 to operate the nuclear plant 2 in full bypass (step S21). As a result, the control unit 5 stops power generation by the nuclear plant 2, and can immediately return the nuclear plant 2 to normal operation from this state.

[0042] Furthermore, the control unit 5 stops the gas turbine plant 3 and maintains that state. The control unit 5 determines whether or not the power grid 6 has recovered from the blackout (step S22).

[0043] If the control unit 5 determines in step S22 that the power system 6 has recovered from the blackout in a short time, it returns the nuclear plant 2 from full bypass operation to normal operation and restarts the gas turbine plant 3 (step S23), and ends the processing in FIG. 4. If the control unit 5 determines in step S22 that the power grid 6 has not recovered from the blackout in a short time (No), the control unit 5 proceeds to step S24.

[0044] In step S24, the control unit 5, having determined that the blackout of the power grid 6 will be prolonged, shuts down the nuclear plant 2. As the nuclear plant 2 has been shut down, the control unit 5 ends the processing in FIG. 4. This enables the control unit 5 to prevent the power generated by the nuclear plant 2 from being excessively supplied to the local load 46. The control unit 5 may start up the gas turbine plant 3 as necessary to supply power to the local load 46.

[0045] FIG. 5 is a flowchart of the process when an instruction is received from the central load dispatching center 9 to supply the nuclear power plant 1 with the electric power required for a black start of the electric power grid 6. When the control unit 5 receives a black start instruction for this nuclear power plant 1 from the central load dispatching center 9 (step S30), a series of black start processing is started.

[0046] The control unit 5 starts up the nuclear plant 2 via the in-house transformer 45 with the power of the gas turbine plant 3 that was started earlier (step S31), and waits until the AC output of the nuclear plant 2 is synchronized with the AC output of the gas turbine plant 3 (step S32). The control unit 5 is connected to a voltage sensor that detects the AC output of the nuclear plant 2 and a voltage sensor that detects the AC output of the gas turbine plant 3.

[0047] Then, the control unit 5 closes the switch 41 to synchronously connect the nuclear plant 2 in parallel with the gas turbine plant 3 (step S33).

[0048] Next, the control unit 5 waits until the AC output of the nuclear plant 2 and the AC output of the gas turbine plant 3 are synchronized with the power grid 6, closes the switch 43, and connects the nuclear plant 2 and the gas turbine plant 3 to the power grid 6 (step S34), and then ends the processing in FIG. 5.

[0049] Conventional nuclear power plants do not have the ability to respond to long-term blackouts of the power grid 6. However, by controlling the nuclear power plant 1 of this embodiment in this manner, it is possible to provide the nuclear power plant 1 with the ability to respond to blackouts in the event of a long-term blackout of the power grid 6.

[0050] Even if the nuclear power plant 2 is shut down, the nuclear reaction continues for a while thereafter, producing hydrogen gas. By using the hydrogen gas as part of the fuel for the gas turbine plant 3, the nuclear power plant 2 can be started up while reducing the consumption of fuels such as natural gas.

[0051] In the event of a long-term blackout of the power grid 6, conventional nuclear power plants are configured to maintain the safety of the plant by supplying power from the on-site emergency diesel generators, limited to supplying power to the plant's safety loads.

[0052] In contrast, the nuclear power plant 1 according to this embodiment is configured to supply power to the local loads 46 of the nuclear plant 2 via the local transformer 45 by operating the gas turbine plant 3 even during a long-term blackout of the power system 6. Therefore, the nuclear power plant 1 according to this embodiment can supply power to the local loads 46 during a long-term blackout of the power system 6 without being limited to loads for the safety of the power plant as in conventional nuclear power plants, so that the plant can be maintained safer and a black start function can be provided.

[0053] (Modification) The present invention is not limited to the above-described embodiment, and includes various modified examples. For example, the above-described embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to those having all of the configurations described. It is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

[0054] The above configurations, functions, processing units, processing means, etc. may be realized in part or in whole by hardware such as an integrated circuit. The above configurations, functions, etc. may be realized by software by a processor interpreting and executing a program that realizes each function. Information such as the program, table, file, etc. that realizes each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as a flash memory card or a DVD (Digital Versatile Disk).

[0055] In each embodiment, the control lines and information lines are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it may be considered that almost all components are connected to each other. [Explanation of symbols]

[0056] 1. Nuclear power generation facilities 2. Nuclear Power Plants 21 Turbine 22 Generator 23 Reactor 241~243 Steam control valve 244 Turbine bypass valve 25 Condenser 26 Feed water heater 27 Water Pump 28 Internal Pump 29 Control Rod Drive Mechanism 3 Gas turbine plant (gas turbine generator) 31 Gas Turbine 32 Generator 34 LNG tank 35 Mixer 36 Hydrogen Tank 41~43 Switchgear 44 Main Transformer 45 Station transformer 46 In-house load 47 In-house wiring 5. Control section 51 Automatic output adjustment system 52 Pressure Control System 53 Recirculation flow control system 54 Control Rod Operation Monitoring System 55 Water Supply Control System 6 Power system 9. Central Power Dispatch Center

Claims

1. A nuclear power plant capable of supplying hydrogen to the outside; a control unit that shuts down the nuclear power plant when a power grid blackout occurs; a gas turbine generator that uses hydrogen generated by a nuclear reaction that continues after the nuclear plant is shut down as fuel and is capable of supplying electric power to a load of the nuclear plant in a state where the power grid is in a blackout state; A nuclear power generation facility comprising:

2. a control unit that starts up the nuclear power plant using electric power generated by the gas turbine generator during a black start; The nuclear power plant according to claim 1, further comprising:

3. a hydrogen tank for storing hydrogen produced in the nuclear power plant; The nuclear power plant according to claim 1, further comprising:

4. a main transformer connecting the nuclear power plant and the gas turbine generator to an electric power grid, The control unit operates the nuclear power plant and the gas turbine generator so as to be synchronously connected in parallel to the power grid.

3. The nuclear power plant according to claim 2.

5. The control unit operates the gas turbine generator to follow a load of a power grid.

3. The nuclear power plant according to claim 2.

6. The control unit operates the nuclear power plant so as to maintain a predetermined output.

3. The nuclear power plant according to claim 2.

7. a switch for cutting off the output of the nuclear power plant from the on-site wiring; The nuclear power plant according to claim 2, further comprising:

8. a switch that cuts off the output of the gas turbine generator from the on-site wiring; The nuclear power plant according to claim 2, further comprising:

9. the control unit causes the nuclear plant to operate in a bull bypass mode for a predetermined time during a blackout.

3. The nuclear power plant according to claim 2.

10. the control unit operates the nuclear power plant in a bull bypass mode for a predetermined time in the event of a blackout, and shuts down the nuclear power plant if the nuclear power plant does not recover from the blackout within the predetermined time. The nuclear power plant according to claim 9 .

11. the control unit causes the nuclear power plant to operate in a bull bypass mode for a predetermined time during a blackout, and returns the nuclear power plant to normal operation when the nuclear power plant recovers from the blackout within the predetermined time. The nuclear power plant according to claim 9 .

12. The control unit disconnects the nuclear power plant and the gas turbine generator from the grid during a blackout.

3. The nuclear power plant according to claim 2.

13. The control unit supplies power to an on-site load by the gas turbine generator during a blackout.

3. The nuclear power plant according to claim 2.

14. A control unit that shuts down a nuclear power plant when a power grid blackout occurs; A step in which the nuclear power plant supplies hydrogen generated by the nuclear reaction continuing after the shutdown to an outside; A gas turbine generator generates electricity using hydrogen produced by a nuclear reaction that continues after the nuclear plant is shut down as fuel; the gas turbine generator supplying power to a load of the nuclear power plant during a blackout condition of the power grid; A method for operating a nuclear power plant, comprising:

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