Composite water electrolysis system using nuclear power plant heat and electrical energy

Abstract

The present invention relates to a composite water electrolysis system using nuclear power plant heat and electrical energy, and, to a composite water electrolysis system for receiving heat energy and electrical energy generated in each of a plurality of SMRs, the system comprising: a heat energy storage hub for storing the heat energy generated in each of the plurality of SMRs; an electrical energy storage hub for storing electrical energy generated in each of the plurality of SMRs; and a composite hydrogen production unit, which receives heat and electricity from the heat energy storage hub and the electrical energy storage hub so as to generate hydrogen and oxygen. According to one embodiment, technologies such as hydrogen production through high-temperature water electrolysis, low-temperature water electrolysis, and ammonia decomposition are diversified, hydrogen and oxygen produced through high-temperature water electrolysis are in a high-temperature state, and the waste heat energy discarded when hydrogen and oxygen are cooled to a low temperature in order to be stored can be used as an additional heat source of low-temperature water electrolysis and ammonia hydrogen decomposition devices.

Description

Composite water electrolysis system utilizing thermal and electrical energy from nuclear power plants

[0001] The present invention relates to a composite water electrolysis system utilizing heat and electric energy of a nuclear power plant, and more particularly, to a composite water electrolysis system utilizing heat and electric energy of a nuclear power plant, which diversifies the use of nuclear power in non-power generation fields through technologies such as high-temperature water electrolysis, low-temperature water electrolysis, and hydrogen production through ammonia decomposition, and which utilizes waste energy heat, which is wasted when cooling hydrogen and oxygen produced through high-temperature water electrolysis to a low temperature for storage, as another heat source for low-temperature water electrolysis and an ammonia hydrogen decomposition device.

[0002] In general, in the rapidly changing international energy environment, such as resource depletion, the enforcement of the Kyoto Protocol, and the surge in oil prices, the relative economic feasibility of new and renewable energy is becoming more advantageous, and the energy market based on new energy technologies such as hydrogen, fuel cells, and solar cells is expected to rapidly emerge as a huge industry that surpasses IT and BT. Accordingly, we have entered a global development competition system for the future new energy industry, and we need to prepare nationally to take the lead in the global market.

[0003] Nuclear power plants are important power plants that handle the base load of the national electricity supply, but there are times during the year when the demand for electricity for heating and cooling decreases, such as in spring and fall, when the demand for electricity falls below the capacity of the base load power facilities. At these times, if the heat energy and electricity of inexpensive, high-quality surplus steam are stored in the form of hydrogen energy, it will not only increase the utilization rate of power facilities and energy utilization efficiency, but also have the effect of contributing to the supply of hydrogen energy.

[0004] Meanwhile, conventional nuclear power plant-linked hydrogen production systems include the sulfur-iodine thermal decomposition method using a high-temperature gas reactor and the water electrolysis method that directly decomposes water using a light water reactor.

[0005] In the case of the sulfur-iodine thermal decomposition method, a relatively high input heat (approximately 900℃) is required, so coolant generated from a high-temperature gas furnace must be utilized.

[0006] Additionally, electrolysis methods can be divided into low-temperature electrolysis (approximately 100°C or less) and high-temperature electrolysis (approximately 800-900°C) depending on the degree of input heat.

[0007] High-temperature water electrolysis, a highly efficient and economical method for producing hydrogen using existing nuclear power plants and small modular reactors (SMRs) currently under development, is being developed. To achieve this, a method utilizing steam thermal energy as the primary source, with additional energy required from electricity (electric heat) being considered.

[0008] Here, ammonia is the raw material (substance) from which hydrogen can be obtained. Ammonia can be converted into hydrogen using catalysts such as ruthenium or nickel. However, ruthenium is expensive and thus uneconomical. Using nickel, an alternative catalyst, requires high temperatures of approximately 600°C or higher to activate the ammonia molecules.

[0009] On the other hand, an energy storage system for a nuclear power plant using hydrogen is disclosed in domestic patent registration number 10-0715222.

[0010] This prior technology provides an energy storage system for nuclear power plants using hydrogen with low production costs, as it can store hydrogen energy by decomposing high-temperature, high-pressure steam generated in a nuclear power plant's steam generator into electricity within the power plant.

[0011] However, the existing hydrogen production system using electrolysis method is composed of a separate hydrogen production system for producing hydrogen in addition to the nuclear power plant consisting of the primary and secondary sides ('1' in Figure 1).

[0012] The technical problem to be achieved by the present invention is to improve the conventional problems, and to diversify technologies such as high-temperature water electrolysis, low-temperature water electrolysis, and hydrogen production through ammonia decomposition, and to provide a composite water electrolysis system using heat and electric energy from a nuclear power plant, which uses the energy waste heat that is wasted when cooling the hydrogen and oxygen produced through high-temperature water electrolysis to a low temperature for storage as another heat source for low-temperature water electrolysis and ammonia hydrogen decomposition devices.

[0013] In addition, the technical task to be achieved by the present invention is to improve the conventional problem, and in order to obtain hydrogen from ammonia, which is easy to store hydrogen, high temperature heat (about 600℃) is required, and by utilizing the high temperature steam of a nuclear power plant, efficient energy utilization is possible, thereby providing a composite water electrolysis system utilizing the heat and electric energy of a nuclear power plant.

[0014] In addition, the technical task to be achieved by the present invention is to improve the conventional problems, and to provide a composite water electrolysis system using the heat and electric energy of a nuclear power plant, which can diversify the use of nuclear power plants by operating the steam heat of a nuclear power plant in parallel with the water electrolysis system as well as the ammonia hydrogen decomposition system.

[0015] In addition, the technical task to be achieved by the present invention is to improve the conventional problems, and to provide a composite water electrolysis system using the heat and electric energy of a nuclear power plant, which can contribute to the recent energy policy requiring flexible operation of nuclear power plants by enabling the steam heat of a nuclear power plant to be utilized in various fields.

[0016] In addition, the technical task to be achieved by the present invention is to improve the conventional problems, and to provide a composite water electrolysis system using nuclear power plant heat and electric energy that can utilize the existing ammonia-related infrastructure (production, transportation, storage, etc.).

[0017] In addition, the technical task to be achieved by the present invention is to improve the conventional problems, and to provide a composite water electrolysis system using the heat and electric energy of a nuclear power plant, which can eliminate concerns about safety analysis due to transient conditions by continuously extracting and using water vapor in terms of nuclear power plant operation.

[0018]

[0019] The composite water electrolysis system using nuclear power plant heat and electric energy according to the characteristics of the present invention to solve these problems is as follows.

[0020] A combined water electrolysis system utilizing the heat and electric energy of a nuclear power plant that separates and stores the steam generated in the steam generator into hydrogen and oxygen.

[0021] A high-temperature water electrolysis device that produces hydrogen and oxygen using steam generated from the above steam generator;

[0022] A first hydrogen storage tank for storing hydrogen generated in the high-temperature water electrolysis device;

[0023] A first oxygen storage tank for storing oxygen generated in the high-temperature water electrolysis device;

[0024] A low-temperature water electrolysis device that produces hydrogen and oxygen using water;

[0025] A second hydrogen storage tank for storing hydrogen generated in the above low-temperature water electrolysis device;

[0026] A second oxygen storage tank for storing oxygen generated in the above low-temperature water electrolysis device;

[0027] An ammonia-hydrogen decomposition device that produces hydrogen and oxygen using steam and ammonia generated in the above steam generator (500);

[0028] A third hydrogen storage tank for storing hydrogen generated in the ammonia-hydrogen decomposition device;

[0029] It includes a nitrogen storage tank for storing nitrogen generated in the above ammonia-hydrogen decomposition device.

[0030] The above high-temperature water electrolysis device, low-temperature water electrolysis device, and ammonia-hydrogen decomposition device use electricity supplied from inside / outside the nuclear power plant for separate heat generation.

[0031] It is characterized in that the waste heat of the high-temperature water electrolysis device is utilized to generate hydrogen and oxygen in the low-temperature water electrolysis device and the ammonia-hydrogen decomposition device.

[0032] The waste heat of hydrogen and nitrogen produced through the above ammonia hydrogen decomposition device can be used again as a heat source for the above low-temperature water electrolysis system.

[0033] The above nuclear power plants include molten salt reactors, high-temperature gas reactors, light water reactors and SMRs.

[0034] Another feature of the present invention for solving these problems is a composite water electrolysis system using nuclear power plant heat and electric energy.

[0035] As a composite water electrolysis system that receives heat energy and electric energy generated from multiple SMRs,

[0036] A thermal energy storage hub that stores thermal energy generated from each of the above-mentioned plurality of SMRs;

[0037] An electric energy storage hub that stores electric energy generated from each of the above-mentioned plurality of SMRs;

[0038] It includes a composite hydrogen production unit that receives heat and electricity from the above-mentioned thermal energy storage hub and electric energy storage hub and produces hydrogen and oxygen.

[0039] The above complex hydrogen production unit produces hydrogen through high-temperature water electrolysis, low-temperature water electrolysis, or ammonia decomposition.

[0040] The above thermal energy hub and electric energy hub can be configured to receive waste heat generated from the composite hydrogen production unit and electricity produced from the fuel cell.

[0041] The control unit can control the plurality of SMRs so that, when some of the plurality of SMRs are stopped from operating, the heat energy and electric energy for the operation of the composite hydrogen production unit allocated to the stopped SMR are additionally allocated to some of the remaining SMRs that are operating normally, and supplied to the heat energy hub and the electric energy hub.

[0042] Here, the control unit can be configured to evenly distribute the amount of thermal energy and electrical energy additionally allocated to the SMR during normal operation.

[0043] The above control unit utilizes the electric energy of other modules in the event of an accident in any SMR.

[0044]

[0045] According to one embodiment, a composite water electrolysis system utilizing heat and electric energy from a nuclear power plant can be provided, which diversifies technologies such as high-temperature water electrolysis, low-temperature water electrolysis, and hydrogen production through ammonia decomposition, and uses the waste energy heat that is wasted when cooling the hydrogen and oxygen produced through high-temperature water electrolysis to a low temperature for storage as another heat source for low-temperature water electrolysis and ammonia hydrogen decomposition devices.

[0046] In addition, according to one embodiment, in order to obtain hydrogen from ammonia, which is easy to store, high temperature heat (about 600°C) is required, and by utilizing high temperature steam from a nuclear power plant, a composite water electrolysis system utilizing nuclear power plant heat and electric energy can be provided, which enables efficient energy utilization.

[0047] In addition, according to one embodiment, a composite water electrolysis system utilizing the heat and electric energy of a nuclear power plant can be provided, which can diversify the use of nuclear power plants by operating the steam heat of the nuclear power plant in parallel with the water electrolysis system as well as the ammonia hydrogen decomposition system.

[0048] In addition, according to one embodiment, a composite water electrolysis system utilizing thermal and electrical energy of a nuclear power plant can be provided, which can contribute to recent energy policies requiring flexible operation of nuclear power plants by enabling the steam heat of a nuclear power plant to be utilized in various fields.

[0049] In addition, according to one embodiment, a composite water electrolysis system utilizing nuclear power plant heat and electric energy can be provided that can utilize existing ammonia-related infrastructure (production, transportation, storage, etc.).

[0050] In addition, according to one embodiment, a composite water electrolysis system utilizing thermal and electric energy of a nuclear power plant can be provided, which can eliminate concerns about safety analysis due to transient conditions by continuously extracting and using water vapor in terms of nuclear power plant operation.

[0051]

[0052] Figure 1 is a schematic diagram of a conventional hydrogen production system.

[0053] Figure 2 is a configuration diagram of a composite water electrolysis system using nuclear power plant heat and electric energy according to the first embodiment of the present invention.

[0054] Figure 3 is a drawing showing the waste heat sharing concept of Figure 2.

[0055] FIG. 4 is a drawing showing a composite water electrolysis system using nuclear power plant heat and electric energy according to a second embodiment of the present invention.

[0056] FIG. 5 is a drawing showing an example of waste heat supply when an SMR is stopped in a composite water electrolysis system using nuclear power plant heat and electric energy according to a second embodiment of the present invention.

[0057] FIG. 6 is a drawing showing an example of electricity supply when an SMR is stopped in a composite water electrolysis system using nuclear power plant heat and electric energy according to a second embodiment of the present invention.

[0058]

[0059] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0060] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0061] FIG. 2 is a configuration diagram of a composite water electrolysis system using nuclear power plant heat and electric energy according to the first embodiment of the present invention, and FIG. 3 is a diagram showing the waste heat sharing concept of FIG. 2.

[0062] Referring to FIG. 2 or FIG. 3, a composite water electrolysis system using nuclear power plant heat and electric energy according to the first embodiment of the present invention is

[0063] A composite water electrolysis system utilizing the heat and electric energy of a nuclear power plant, which separates and stores the steam generated in a steam generator (500) into hydrogen and oxygen.

[0064] A high-temperature water electrolysis device (11) that produces hydrogen and oxygen using steam generated from the above steam generator (500);

[0065] A first hydrogen storage tank (15) for storing hydrogen generated in the high-temperature water electrolysis device (11);

[0066] A first oxygen storage tank (14) for storing oxygen generated in the high-temperature water electrolysis device (11);

[0067] A low-temperature water electrolysis device (12) that produces hydrogen and oxygen using water;

[0068] A second hydrogen storage tank (17) for storing hydrogen generated in the above low-temperature water electrolysis device (12);

[0069] A second oxygen storage tank (16) for storing oxygen generated in the above low-temperature water electrolysis device (12);

[0070] An ammonia-hydrogen decomposition device (13) that produces hydrogen and oxygen using steam and ammonia generated in the above steam generator (500);

[0071] A third hydrogen storage tank (19) for storing hydrogen generated in the above ammonia-hydrogen decomposition device (13);

[0072] It includes a nitrogen storage tank (18) for storing nitrogen generated in the above ammonia-hydrogen decomposition device (13).

[0073] Typically, a nuclear power plant is composed of a primary side including a reactor pressure vessel (300) and a secondary side including a turbine system (600), as shown in Fig. 2.

[0074] The coolant on the secondary side circulates through the reactor coolant pump (200), and as the high-pressure coolant passes through the core of the reactor pressure vessel (300), it gains a lot of heat, and this coolant transfers energy to the secondary side through the steam generator (500). The coolant on the secondary side circulates through the main feedwater pump (100), and receives energy from the primary side through the steam generator (500), generating high-temperature, high-pressure steam, which then rotates the turbine system (600) to produce electricity.

[0075] Here, the high-temperature water electrolysis device (11), the low-temperature water electrolysis device (12), and the ammonia-hydrogen decomposition device (13) receive electricity from inside / outside the nuclear power plant for separate heat generation.

[0076] The classification of facilities according to the required level of heat energy is as follows.

[0077] High temperature electrolysis is about 800℃.

[0078] Ammonia hydrogen decomposition is about 600℃.

[0079] Low temperature electrolysis is below 100℃.

[0080] Specifically, as shown in Fig. 2, the hydrogen production system proposed in the present invention utilizes high-temperature / high-pressure steam and generated electricity on the secondary side in the same manner as the existing method, but selects and utilizes a high-temperature water electrolysis device (11), a low-temperature water electrolysis device (12), and the ammonia-hydrogen decomposition device (13) singly or in combination depending on the operating conditions of the power plant.

[0081] At this time, in the case of high-temperature water electrolysis and ammonia hydrogen decomposition, the operating temperature cannot be reached with only the heat energy of steam (approximately 300℃), so electricity is received from inside / outside the power plant for separate heat transfer.

[0082] Furthermore, hydrogen and oxygen produced through high-temperature water electrolysis are at high temperatures and must be cooled to low temperatures for storage. The waste heat generated during this process can be used as another heat source for the low-temperature water electrolysis device (12) and the ammonia-hydrogen decomposition device (13). This concept is illustrated in Figure 3.

[0083] Referring to FIG. 3, the A part of FIG. 2 is changed to utilize the waste heat of the high-temperature water electrolysis device (11) for hydrogen and oxygen generation in the low-temperature water electrolysis device (12) and the ammonia-hydrogen decomposition device (13).

[0084] With the same concept as in Fig. 3, the waste heat of hydrogen and nitrogen produced through the ammonia-hydrogen decomposition device (13) can be used again as a heat source for the low-temperature water electrolysis system.

[0085] Although all systems here can be configured independently, the system proposed in the present invention is one that can be operated in combination.

[0086] By composing two or more systems in this way, economic benefits can be achieved.

[0087] The above nuclear power plants include molten salt reactors, high-temperature gas reactors, light water reactors and SMRs.

[0088] A composite water electrolysis system using nuclear power plant heat and electric energy according to another feature of the present invention is described as follows.

[0089] FIG. 4 is a drawing showing a composite water electrolysis system using nuclear power plant heat and electric energy according to a second embodiment of the present invention, FIG. 5 is a drawing showing an example of waste heat supply when an SMR is stopped in a composite water electrolysis system using nuclear power plant heat and electric energy according to a second embodiment of the present invention, and FIG. 6 is a drawing showing an example of electricity supply when an SMR is stopped in a composite water electrolysis system using nuclear power plant heat and electric energy according to a second embodiment of the present invention.

[0090] Referring to FIGS. 4 to 6, a composite water electrolysis system using nuclear power plant heat and electric energy according to the second embodiment of the present invention is

[0091] As a composite water electrolysis system that receives heat energy and electric energy generated from multiple SMRs,

[0092] A thermal energy hub (31) that stores thermal energy generated from each of the above-mentioned plurality of SMRs;

[0093] An electric energy hub (32) that stores electric energy generated from each of the above-mentioned plurality of SMRs;

[0094] It includes a composite hydrogen production unit (35) that receives heat and electricity from the above-mentioned thermal energy hub (31) and electric energy hub (32) and produces hydrogen and oxygen.

[0095] The above-mentioned composite hydrogen production unit (35) produces hydrogen through high-temperature water electrolysis, low-temperature water electrolysis, or ammonia decomposition. Specifically, the composite hydrogen production unit (35), which is composed of devices that each produce hydrogen in a different manner, receives and distributes thermal energy and / or electrical energy from a thermal energy hub (31) and an electrical energy hub (32), and supplies the same to each hydrogen production device.

[0096] The above thermal energy hub (31) and electric energy hub (32) can be configured to receive waste heat generated from the composite hydrogen production unit (35) and electricity produced from the fuel cell (33).

[0097] Specifically, the thermal energy hub (31) and the electric energy hub (32) can be configured to store thermal energy and electric energy received from the SMR. In addition, the thermal energy hub (31) and the electric energy hub (32) can be configured to receive waste heat generated from the composite hydrogen production unit (35) and electricity produced from the fuel cell (33).

[0098] According to the configuration of the composite hydrogen production system, the thermal energy and electrical energy generated from multiple SMRs and composite hydrogen production units (35) and fuel cells (33) are collected and distributed in one place, so that the thermal energy and / or electrical energy required for the operation of the composite hydrogen production unit (35) can be supplied more stably.

[0099] Referring to FIG. 5, the control unit (34) can control the plurality of SMRs to additionally allocate the thermal energy and electrical energy for the operation of the composite hydrogen production unit (35) allocated to the stopped SMR to the remaining SMRs that are in normal operation, and supply them to the thermal energy hub (31) and the electrical energy hub (32), when the operation of any one of the plurality of SMRs is stopped.

[0100] Here, the control unit (34) can be configured to evenly distribute the amount of thermal energy and electrical energy additionally allocated to the SMR during normal operation.

[0101] Referring to Figure 5, in normal times, SMR#1, SMR#2, and SMR#3 each supply 60% of the thermal energy.

[0102] When SMR#2 fails, heat energy is supplied at a ratio of 90% for SMR#1, 0% for SMR#2, and 90% for SMR#3.

[0103] Referring to Fig. 6, the control unit (34) utilizes the electric energy of another module when an accident occurs in any SMR.

[0104] Referring to Figure 6, in normal times, SMR#1, SMR#2, and SMR#3 each supply 10% of electricity.

[0105] In case of SMR#2 failure, electricity is supplied at a ratio of SMR#1 15%, SMR#2 0%, and SMR#3 15%.

[0106] In this way, the control unit (34) of the complex hydrogen production system can control the multiple SMRs so that, when some of the multiple SMRs are out of operation (due to breakdown or maintenance), the thermal energy and electrical energy for the operation of the complex hydrogen production unit (35) allocated to the outgoing SMR are additionally allocated to some of the other SMRs that are in normal operation and supplied to the thermal energy hub (31) and the electrical energy hub (32).

[0107] Here, the control unit (34) can be configured to evenly distribute the amount of thermal energy and electrical energy additionally allocated to the SMR during normal operation.

[0108] According to one embodiment, technologies such as high-temperature water electrolysis, low-temperature water electrolysis, and hydrogen production through ammonia decomposition are diversified, and hydrogen and oxygen produced through high-temperature water electrolysis are in a high-temperature state, and the waste energy heat that is wasted when cooling them to a low temperature for storage can be used as another heat source for low-temperature water electrolysis and ammonia hydrogen decomposition devices.

[0109] In addition, according to one embodiment, high temperature heat (about 600°C) is required to obtain hydrogen from ammonia, which is easy to store, but efficient energy utilization is possible by utilizing high temperature steam from a nuclear power plant.

[0110] In addition, according to one embodiment, the use of nuclear power plants can be diversified by operating the steam heat of nuclear power plants in parallel with the ammonia hydrogen decomposition system as well as the water electrolysis system.

[0111] In addition, according to one embodiment, it can contribute to recent energy policies that require flexible operation of nuclear power plants by making it possible to utilize the steam heat of nuclear power plants in various fields.

[0112] Additionally, according to one embodiment, existing ammonia-related infrastructure (production, transportation, storage, etc.) can be utilized together.

[0113] In addition, according to one embodiment, by continuously extracting and using steam in terms of nuclear power plant operation, concerns about safety interpretation due to transient conditions can be eliminated.

[0114] Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

Claims

1. A combined water electrolysis system that uses the heat and electric energy of a nuclear power plant to separate and store the steam generated in the steam generator into hydrogen and oxygen. A high-temperature water electrolysis device that produces hydrogen and oxygen using steam generated from the above steam generator; A first hydrogen storage tank for storing hydrogen generated in the above high-temperature water electrolysis device; A first oxygen storage tank for storing oxygen generated in the above high-temperature water electrolysis device; A low-temperature water electrolysis device that produces hydrogen and oxygen using water; A second hydrogen storage tank for storing hydrogen generated in the above low-temperature water electrolysis device; A second oxygen storage tank for storing oxygen generated in the above low-temperature water electrolysis device; An ammonia-hydrogen decomposition device that produces hydrogen and oxygen using steam and ammonia generated from the above steam generator (500); A third hydrogen storage tank for storing hydrogen generated in the above ammonia-hydrogen decomposition device; A combined water electrolysis system utilizing nuclear power plant heat and electric energy, including a nitrogen storage tank for storing nitrogen produced in the above ammonia-hydrogen decomposition device.

2. In paragraph 1, The above high-temperature water electrolysis device, the low-temperature water electrolysis device, and the ammonia-hydrogen decomposition device are a combined water electrolysis system using the heat and electric energy of a nuclear power plant, which supplies electricity from inside / outside the nuclear power plant for separate heat generation.

3. In paragraph 2, A composite water electrolysis system utilizing heat and electric energy of a nuclear power plant, characterized in that the waste heat of the high-temperature water electrolysis device is utilized to generate hydrogen and oxygen in the low-temperature water electrolysis device and the ammonia-hydrogen decomposition device.

4. In paragraph 3, A composite water electrolysis system using nuclear power plant heat and electric energy, in which the waste heat of hydrogen and nitrogen produced through the above ammonia hydrogen decomposition device is used as a heat source for the above low-temperature water electrolysis system.

5. In paragraph 4, The above nuclear power plant is a combined water electrolysis system using nuclear power plant heat and electric energy, including a molten salt reactor, a high-temperature gas reactor, a light water reactor, and a SMR.

6. A composite water electrolysis system that receives thermal energy and electrical energy generated from multiple SMRs, A thermal energy storage hub that stores thermal energy generated from each of the above-mentioned plurality of SMRs; An electric energy storage hub that stores electric energy generated from each of the above-mentioned plurality of SMRs; A combined water electrolysis system utilizing thermal and electrical energy of a nuclear power plant, including a combined hydrogen production unit that receives heat and electricity from the thermal energy storage hub and the electrical energy storage hub and produces hydrogen and oxygen.

7. In paragraph 6, The above complex hydrogen production unit is a complex water electrolysis system that uses the heat and electric energy of a nuclear power plant to produce hydrogen through high-temperature water electrolysis, low-temperature water electrolysis, or ammonia decomposition.

8. In paragraph 7, The above heat energy hub and electric energy hub are a combined water electrolysis system using heat and electric energy of a nuclear power plant, which are supplied with waste heat generated from the above-mentioned combined hydrogen production unit and electricity produced from a fuel cell.

9. In paragraph 8, A nuclear power plant thermal and electric energy-using combined water electrolysis system, which controls a plurality of SMRs so that, when some of the SMRs stop operating, the thermal energy and electric energy for the operation of the combined hydrogen production unit allocated to the stopped SMRs are additionally allocated to some of the other SMRs that are in normal operation, thereby supplying them to the thermal energy hub and the electric energy hub.

10. In Article 9, The above control unit is a combined water electrolysis system using nuclear power plant heat and electric energy that evenly distributes the amount of additional heat energy and electric energy allocated to the SMR during normal operation.

11. In Article 10, The above control unit is a combined water electrolysis system using nuclear power plant heat and electric energy that utilizes the electric energy of other modules in the event of an accident in any SMR.

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