Coolant supply system, coolant supply method, and program

Abstract

To provide a coolant supply system, a coolant supply method, and a program that can properly supply coolant. [Solution] The coolant supply system according to the present disclosure is a coolant supply system for supplying coolant to a nuclear facility, comprising: a coolant tank in which coolant is stored; and an operating unit that vaporizes a vaporization liquid, accumulates the gas produced by vaporization inside the coolant tank to increase the pressure, and supplies coolant from the coolant tank.

Description

Technical Field

[0001] The present disclosure relates to a coolant supply system, a coolant supply method, and a program.

Background Art

[0002] In a nuclear power plant, a loss of coolant accident (LOCA) may occur, such as when a pipe connected to a reactor containment vessel is damaged, and cooling water (primary coolant) for removing heat from the core flows out. To prepare for the occurrence of a loss of coolant accident, equipment for removing the decay heat (residual heat) of the core, so-called an emergency core cooling system (ECCS), is provided.

[0003] For example, in Patent Document 1 below, a water source (for example, a suppression pool) capable of storing cooling water and a water injection pipe for guiding the cooling water stored in the water source to an injection target in the containment vessel are provided in the containment vessel for storing a nuclear reactor, and a water injection pump provided in the water injection pipe for pumping the cooling water from the water source toward the injection target in the containment vessel are disclosed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the emergency core cooling system as described in Patent Document 1 above, although it has an emergency core cooling device, power is essential for the operation of pumps, valves, etc. Therefore, if the emergency power supply is completely lost, there is a problem that the decay heat of the fuel rods cannot be released.

[0006] In view of the above issues, this disclosure aims to provide a coolant supply system, a coolant supply method, and a program that can appropriately supply coolant. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the objective, the coolant supply system according to this disclosure is a coolant supply system for supplying coolant to a nuclear facility, comprising: a coolant tank in which coolant is stored; and an operating unit that vaporizes a vaporization liquid, accumulates the gas produced by vaporization inside the coolant tank to increase the pressure, and supplies coolant from the coolant tank.

[0008] To solve the above-mentioned problems and achieve the objectives, the coolant supply method according to this disclosure is a coolant supply method using a coolant supply system, and includes the steps of: acquiring measurement values ​​related to the nuclear equipment; determining whether or not it is necessary to supply coolant to the nuclear equipment based on the measurement values; and transmitting a control signal to open a gate valve if it is determined that it is necessary to supply coolant.

[0009] To solve the above-mentioned problems and achieve the objectives, the program relating to this disclosure is a program that causes a computer of a coolant supply system to perform processing, and includes the steps of: acquiring measured values ​​relating to the nuclear equipment; determining whether or not it is necessary to supply coolant to the nuclear equipment based on the measured values; and, if it is determined that it is necessary to supply coolant, transmitting a control signal to open a gate valve. [Effects of the Invention]

[0010] This disclosure provides a coolant supply system, a coolant supply method, and a program that can appropriately supply coolant. [Brief explanation of the drawing]

[0011] [Figure 1]Figure 1 is a diagram showing an overview of the nuclear power plant related to this disclosure. [Figure 2] Figure 2 shows an example configuration of the first embodiment of the coolant supply system according to this disclosure. [Figure 3] Figure 3 shows an example configuration of a second embodiment of the coolant supply system according to this disclosure. [Figure 4] Figure 4 is a schematic diagram showing the operating state of the second embodiment of the coolant supply system according to this disclosure. [Figure 5] Figure 5 shows an example configuration of a third embodiment of the coolant supply system according to this disclosure. [Figure 6] Figure 6 shows an example configuration of the fourth embodiment of the coolant supply system according to this disclosure. [Figure 7] Figure 7 shows a second aspect of the fourth embodiment of the coolant supply system according to this disclosure. [Figure 8] Figure 8 shows an example of the configuration of the control device according to this disclosure. [Figure 9] Figure 9 shows an example of information stored in the measurement data storage unit of the control device according to this disclosure. [Figure 10] Figure 10 is a flowchart showing the flow of the coolant supply method according to this disclosure. [Figure 11] Figure 11 is a hardware configuration diagram showing an example of a computer that implements the functions of the control device according to this disclosure. [Modes for carrying out the invention]

[0012] Embodiments of this disclosure will be described in detail below with reference to the drawings. However, the embodiments described below will not limit this disclosure.

[0013] (Configuration of nuclear power facilities) First, the configuration of the nuclear facility 1 according to the present disclosure will be described with reference to FIG. 1. FIG. 1 is a diagram showing an overview of the nuclear facility according to the present disclosure. The nuclear facility 1 according to the present disclosure is a facility that executes a predetermined function by nuclear power, and in this embodiment, it is a nuclear power plant. As shown in FIG. 1, the nuclear facility 1 of this embodiment includes a coolant supply system 100 and a reactor section 200. Although not shown in FIG. 1, the nuclear facility 1 also includes a steam turbine, a condenser, and the like. Further, a control device 300 for comprehensively controlling the nuclear facility 1 may be provided. The control device 300 is connected to various devices of the nuclear facility 1 so as to be able to exchange information wired or wirelessly. Note that the coolant supply system 100 is a system that supplies coolant in an emergency, and may include the control device 300 as a part of the configuration of the coolant supply system 100. However, the coolant supply system 100 and the control device 300 will be described in detail later.

[0014] As shown in FIG. 1, the reactor section 200 of the nuclear facility 1 includes a reactor containment vessel 20, a reactor pressure vessel 21, a pressurizer 22, a steam generator 23, a coolant pump 24, a primary coolant pipe 25, and a secondary coolant pipe 26. These configurations will be described in order below.

[0015] The reactor containment vessel 20 is a vessel that houses main equipment such as the reactor pressure vessel 21 and the primary coolant system. The reactor containment vessel 20 is made with high airtightness, and is formed with a shape, plate thickness, and material that can suppress the diffusion to the surroundings in the case where radioactive substances are released due to damage of the fuel rods or the like, and can withstand high temperature and high pressure during an accident. The reactor containment vessel 20 may be realized, for example, by a steel vessel or a reinforced concrete vessel lined with a steel plate.

[0016] The reactor pressure vessel 21 is a cylindrical pressure vessel that withstands the high temperature and high pressure inside it and allows the coolant to flow between the inside and the outside. The reactor pressure vessel 21 shields the radioactive substances and radiation generated inside it from leaking to the outside. Fuel rods and control rods are arranged inside the reactor pressure vessel 21, and the primary coolant piping 25 is connected to allow the coolant to flow.

[0017] The pressurizer 22 is a device that increases the pressure of the primary coolant so as not to boil the primary coolant. Specifically, when the pressure of the primary coolant system drops, the pressurizer 22 energizes the electric heater in contact with the primary coolant to generate steam from the primary coolant, thereby increasing the volume of the steam and raising the pressure of the primary coolant system.

[0018] The steam generator 23 may include, for example, a vertical U-tube type heat exchanger, and generates steam from the secondary coolant by transferring the thermal energy of the primary coolant generated inside the reactor pressure vessel 21 to the secondary coolant through the heat exchanger. The steam generator 23 is arranged above the primary coolant piping 25 connected to the reactor pressure vessel 21 so that decay heat can be removed by natural circulation after the reactor is shut down.

[0019] The coolant pump 24 is a pump that circulates the primary coolant at a constant flow rate. A single-stage mixed-flow pump driven by an electric motor may be used for the coolant pump 24. The coolant pump 24 sucks the primary coolant from below the coolant pump 24, pressurizes it with an impeller, and discharges it from the side of the coolant pump 24 through a diffuser.

[0020] The primary coolant piping 25 is a piping through which the primary coolant circulates inside. That is, the primary coolant piping 25 is connected to the reactor pressure vessel 21 and supplies the primary coolant heated inside the reactor pressure vessel 21 to the pressurizer 22, the steam generator 23, and the coolant pump 24 in this order, and then allows it to flow back into the reactor pressure vessel 21.

[0021] The secondary coolant piping 26 is a pipe through which secondary coolant circulates. The secondary coolant piping 26 supplies steam generated inside the steam generator 23 to a steam turbine, etc. (not shown in Figure 1) located outside the reactor containment vessel 20. The steam supplied to the steam turbine, etc. through the secondary coolant piping 26 condenses in a condenser (not shown) and is returned to the steam generator 23 as cooling water through the secondary coolant piping 26 again.

[0022] In this way, the nuclear power plant 1 generates thermal energy in the reactor pressure vessel 21, thereby warming the pressurized primary coolant, transferring thermal energy from the primary coolant to the secondary coolant to generate steam, and using the generated steam to rotate a steam turbine to generate electricity.

[0023] In the above explanation, the configuration of the nuclear power plant 1 is described for a pressurized water reactor, but the nuclear power plant 1 may also be a boiling water reactor. In this case, the nuclear power plant 1 consists of a reactor containment vessel 20, a reactor pressure vessel 21, primary coolant piping 25, a steam turbine, a condenser, and a coolant supply system 100, etc. The nuclear power plant 1 may also be a light water small reactor. A light water small reactor is miniaturized by integrating the pressurizer 22, steam generator 23, coolant pump 24, and primary coolant piping 25 of a pressurized water reactor into a module and arranging them inside the reactor pressure vessel 21. Here, the light water small reactor may also be a natural circulation reactor without a pump. By modularizing, manufacturing and construction costs are reduced, and a design philosophy is adopted that, in principle, eliminates the risk of accidents such as loss of coolant due to rupture of the primary coolant piping 25.

[0024] (Regarding the coolant supply system) The coolant supply system 100 according to this disclosure is a coolant supply system 100 for supplying coolant to a nuclear facility 1, and comprises a coolant tank 110 in which coolant is stored, and an operating unit that vaporizes a vaporization liquid 131, accumulates the gas produced by vaporization inside the coolant tank 110 to increase the pressure, and supplies coolant from the coolant tank 110. In this embodiment, the coolant supply system 100 supplies coolant inside the reactor pressure vessel 21 of the nuclear facility 1, but the target of coolant supply is not limited to the inside of the reactor pressure vessel 21, and may supply coolant to any location within the nuclear facility 1. Furthermore, the coolant supply system 100 may be installed inside the reactor containment vessel 20.

[0025] (First Embodiment) Next, a first embodiment of the coolant supply system 100 according to this disclosure will be described with reference to Figure 2. Figure 2 is a diagram showing an example of the configuration of the first embodiment of the coolant supply system according to this disclosure. As shown in Figure 2, the first embodiment of the coolant supply system 100 according to this disclosure comprises a coolant tank 110, a temperature control tank 120, a vaporization liquid tank 130, a heat transfer promotion plate 140, a temperature control device 150, a gate valve 160, a check valve 170, a first pipe 180, and a second pipe 190. In the first embodiment of the coolant supply system 100 according to this disclosure, all of these components except the coolant tank 110 are the operating parts. These components will be described in order below.

[0026] The coolant tank 110 is a storage container for storing the coolant 111. The coolant 111 is, for example, water or liquid metal (for example, sodium). The coolant tank 110 contains, for example, 100 m 3 The coolant tank 110 may contain water. The coolant tank 110 is connected to the first pipe 180, which is connected to the reactor pressure vessel 21 and the primary coolant piping 25. The coolant tank 110 is also connected to the second pipe 190, which is connected to the vaporization liquid tank 130 located inside the temperature control tank 120. The pressure inside the coolant tank 110 may be maintained at atmospheric pressure before operation.

[0027] The temperature control material tank 120 is a storage container that houses a vaporization liquid tank 130 and a temperature control material 121. The temperature control material 121 inside the temperature control material tank 120 may be maintained at a predetermined temperature (for example, 25°C) by a temperature control device 150, which will be described later. The temperature control material 121 may be water, the same as the coolant 111, or any other heat transport medium. The temperature control material tank 120 may be a cylindrical tank with one end open to the atmosphere and the other end closed, and a part of the body of the temperature control material tank 120 may be buried underground. Since the temperature in the ground at a depth of 10m or more is maintained at approximately 15°C throughout the year, it is possible to easily control the temperature inside the temperature control material tank 120 by the temperature control device 150, which will be described later.

[0028] The temperature control tank 120 may be formed as a vacuum double-walled structure, including an inner tank of an inner container and an outer tank of an outer container, with the space between the inner and outer tanks kept under vacuum. An insulating material may be inserted between the inner and outer tanks; for example, perlite insulating material or aerogel insulating material may be provided on the surfaces of the inner and outer tanks. This suppresses the inflow of heat from the external environment, reducing the need for temperature adjustment by the temperature control device 150 described later, and making it easier to maintain a constant temperature.

[0029] The vaporization liquid tank 130 is a storage container for storing the vaporization liquid 131, which is a liquid that is vaporized by a decrease in pressure. The vaporization liquid 131 stored in the vaporization liquid tank 130 may be, for example, liquefied carbon dioxide (Liquefied CO2) or liquefied nitrous oxide (Liquefied N2O). The liquefied carbon dioxide stored in the vaporization liquid tank 130 may be maintained at, for example, 25°C and 6.4 MPa (saturation conditions). That is, the vaporization liquid tank 130 is formed with a shape, plate thickness, and material that can withstand these conditions. The vaporization liquid tank 130 may be made of, for example, stainless steel.

[0030] The vaporization liquid tank 130 utilizes the reduced pressure inside the vaporization liquid tank 130 caused by opening the gate valve 160, which will be described later, to reduce the pressure and boil the vaporization liquid 131. The vaporized gas 132 is then sent to the coolant tank 110 via the second pipe 190. This increases the pressure inside the coolant tank 110, allowing the coolant 111 to be supplied to the reactor pressure vessel 21 and the primary coolant piping 25 via the first pipe 180. With this configuration of the vaporization liquid tank 130, the vaporization liquid 131 and the coolant 111 storage tank are separated, which prevents the vaporization liquid 131 and vaporized gas 132 from dissolving into the coolant during long standby periods before operation.

[0031] The heat transfer accelerating plate 140 facilitates heat transfer from the temperature control material 121 in the temperature control material tank 120 to the vaporization liquid tank 130 by creating a natural circulation flow of the temperature control material 121 as shown by the arrows in Figure 2. The heat transfer accelerating plate 140 may be formed, for example, as a flat plate or as a cylindrical shape surrounding the vaporization liquid tank 130, and the surface of the flat or cylindrical part may be provided in a position that is in contact with the temperature control material 121. The heat transfer accelerating plate 140 may also be made of, for example, an aluminum alloy or a copper alloy. Furthermore, the heat transfer accelerating plate 140 may have fins provided perpendicular to the flat plate to promote heat transfer.

[0032] The temperature control device 150 maintains the temperature of the vaporized liquid 131 inside the vaporized liquid tank 130 and the temperature control material 121 inside the temperature control material tank 120 at predetermined temperatures. The temperature control device 150 may be, for example, a vapor compression heat pump that handles heat transfer with the surrounding environment using the heat of vaporization and condensation of the heat transfer medium. The vapor compression heat pump comprises a compressor, a condenser, an expansion valve, and an evaporator, and controls heat transfer by the compression and expansion of the heat transfer medium. Carbon dioxide or ammonia may be used as the heat transfer medium. The temperature control device 150 is not limited to a heat pump and may be any device capable of heating, for example, an electric heater using a heating wire. If the temperature control device 150 is a heat pump, it may be connected to solar heat or a heat-absorbing part inside the reactor containment vessel 20 in order to maintain the temperature of the vaporized liquid during operation. Furthermore, since the temperature control device 150 does not operate in the event of a power outage, the temperature control material tank 120 may be made large-capacity to store enough fluid to compensate for the heat of vaporization generated inside the vaporization liquid tank 130, and may be open to the atmosphere.

[0033] The gate valve 160 is a valve that controls the flow rate of a fluid. The gate valve 160 according to the first embodiment has a gate valve 160A and a gate valve 160B. The gate valve 160A is installed in the middle of the second piping 190 that connects the coolant tank 110 and the vaporization liquid tank 130, and controls the flow of vaporized gas 132 of the vaporization liquid 131 between the two. The gate valve 160 may be an electric valve driven by an electric motor powered by a battery so that it can operate even when the emergency power supply is lost, and may be, for example, a ball valve type or a swing type gate valve. The gate valve 160 is connected to the control device 300, which will be described later, so that signals can be sent and received by wire or wirelessly. That is, the opening and closing of the gate valve 160 is controlled by a control signal from the control device 300. The power supply for driving and operating these can be operated by a battery so that it can operate even when the emergency power supply is lost.

[0034] The check valve 170 is a valve for preventing backflow of fluid. The check valve 170 is installed in the middle of the first piping 180 that connects the reactor pressure vessel 21 and the primary coolant piping 25 to the coolant tank 110. The check valve 170 allows fluid to pass through when the pressure on the inlet side is higher than the pressure on the outlet side. In other words, the check valve 170 supplies coolant 111 to the reactor pressure vessel 21 and the primary coolant piping 25 when the pressure in the coolant tank 110 is higher than the internal pressure of the reactor pressure vessel 21 and the primary coolant piping 25. The check valve 170 may be implemented by, for example, a spring disc type, swing type, or lift type check valve.

[0035] The first piping 180 connects the nuclear equipment 1 (the area to which the coolant 111 is supplied, in this example the reactor pressure vessel 21 and the primary coolant piping 25) to the coolant tank 110. The first piping 180 is formed with a shape, plate thickness, and material that can withstand the pressure and temperature of the coolant 111 flowing through it. The first piping 180 is equipped with a gate valve 160B and a check valve 170, starting from the side closest to the coolant tank 110.

[0036] The second pipe 190 connects the coolant tank 110 and the vaporization liquid tank 130. The second pipe 190 is formed with a shape, plate thickness, and material that can withstand the pressure and temperature of the vaporized gas 132 of the vaporization liquid 131 flowing inside it. As described above, the second pipe 190 is equipped with a gate valve 160A.

[0037] As described above, according to the coolant supply system 100 of the first embodiment, by using the high pressure maintained by the depressurized boiling of the vaporization liquid 131 as the driving force for injecting the coolant 111, it is possible to inject the coolant 111 into the reactor pressure vessel 21 and the primary coolant piping 25 at high pressure without requiring power equipment such as pumps for the coolant 111. Furthermore, by utilizing the heat input from the temperature control material 121 in the temperature control material tank 120 to the vaporization liquid 131, it is possible to suppress the temperature drop of the vaporization liquid 131 due to the heat of vaporization during depressurized boiling of the vaporization liquid 131, thereby preventing or suppressing a decrease in the rate of depressurized boiling and a decrease in the total amount of steam generated due to depressurized boiling.

[0038] (Second embodiment) Next, a second embodiment of the coolant supply system according to this disclosure will be described with reference to Figure 3. Figure 3 is a diagram showing an example of the configuration of the second embodiment of the coolant supply system according to this disclosure. As shown in Figure 3, the second embodiment of the coolant supply system 100 according to this disclosure comprises a coolant tank 110, a heat transfer promotion plate 140, a temperature control device 150, a gate valve 160, a check valve 170, and a first pipe 180. In the second embodiment of the coolant supply system 100 according to this disclosure, all of these components except the coolant tank 110 are the operating parts. These components will be described in order below.

[0039] The coolant tank 110 according to the second embodiment stores both the coolant 111 and the vaporization liquid 112 inside. Specifically, the coolant tank 110 according to the second embodiment stores both the coolant 111 and the vaporization liquid 112, and when the vaporization liquid 112 is liquefied carbon dioxide and the coolant 111 is water, the density of liquefied carbon dioxide is (711 kg / m³). 3 ) is the water (1000 kg / m³) of the coolant 111. 3 Since its density is lower than that of liquefied carbon dioxide, the liquefied carbon dioxide floats on the water of the coolant 111. The water is, for example, 100m 3Water may be stored. In addition, liquefied carbon dioxide may be kept at 25°C and maintained at 6.4 MPa (saturation condition). Furthermore, the internal pressure of the coolant tank 110 according to the second embodiment may be kept at a higher value than the pressure at which the reactor pressure vessel 21 requires injected cooling water (for example, about 5 MPa).

[0040] The coolant tank 110 according to the second embodiment is formed in a vacuum double-wall structure, similar to the temperature control tank 120 according to the first embodiment, and may use perlite insulation or aerogel insulation as the thermal insulation material. This suppresses the inflow of heat from the external environment, reduces the operation of the temperature control device 150 for adjusting the temperature inside the coolant tank 110, and thus reduces energy consumption.

[0041] The heat transfer accelerating plate 140 according to the second embodiment promotes heat transfer between the coolant 111 and the vaporizing liquid 112. The heat transfer accelerating plate 140 may be formed in the shape of a flat plate, and the surface of the flat portion may be positioned to be in contact with both the coolant 111 and the vaporizing liquid 112. The heat transfer accelerating plate 140 may also be made of a material with high thermal conductivity, such as an aluminum alloy or a copper alloy. The heat transfer accelerating plate 140 may also include fin portions provided perpendicular to the flat portion to promote heat transfer from the coolant 111 to the vaporizing liquid 112.

[0042] The temperature control device 150 according to the second embodiment maintains the temperature of both the coolant 111 inside the coolant tank 110 and the vaporization liquid 112, for example, liquefied carbon dioxide, at a predetermined temperature. The temperature control device 150 according to the second embodiment may be implemented with the same configuration as the temperature control device 150 according to the first embodiment.

[0043] The gate valve 160 according to the second embodiment is installed in the middle of the first pipe 180 that connects the coolant tank 110 to the reactor pressure vessel 21 and the primary coolant piping 25, thereby blocking the connection between them. Other features of the gate valve 160 according to the second embodiment may be the same as those of the gate valve 160 according to the first embodiment described above, so their description will be omitted.

[0044] The check valve 170 according to the second embodiment is installed on the side of the reactor pressure vessel 21 that is located in the first piping 180 connecting the coolant tank 110 to the reactor pressure vessel 21 and the primary coolant piping 25, or on the side of the coolant tank 110 that is located that is located that is located that is located that is located that is located on the side of the reactor pressure vessel 21 and the primary coolant piping 25 that is located, to prevent backflow of coolant 111 and primary coolant (not shown) from the reactor pressure vessel 21 and the primary coolant piping 25. Other features of the check valve 170 according to the second embodiment may be the same as those of the check valve 170 according to the first embodiment described above, so their description will be omitted.

[0045] The first piping 180 according to the second embodiment connects the coolant tank 110 to the reactor pressure vessel 21 and the primary coolant piping 25. The features of the first piping 180 according to the second embodiment may be the same as those of the first piping 180 according to the first embodiment described above, so their description will be omitted.

[0046] Next, the operation of the second embodiment of the coolant supply system 100 according to this disclosure will be explained with reference to Figure 4. Figure 4 is a schematic diagram showing the state when the second embodiment of the coolant supply system according to this disclosure is in operation. As shown in Figure 4, when the second embodiment of the coolant supply system 100 is operated by opening the gate valve 160, under conditions where the internal pressure of the reactor pressure vessel 21 and the primary coolant piping 25 is lower than the internal pressure of the coolant tank 110, the internal pressure of the coolant tank 110 decreases, causing the vaporization liquid 112 stored inside the coolant tank 110 to depressurize and boil. Furthermore, since heat is supplied to the vaporization liquid 112 from the temperature control device 150 and the coolant 111 and heat transfer promotion plate 140 whose temperatures are controlled by the temperature control device 150, it is possible to suppress the cooling of the vaporization liquid 112 by the heat of vaporization of the vaporization liquid 112, causing it to solidify (or dry ice if the vaporization liquid 112 is liquefied carbon dioxide), and to suppress the decrease in pressure of the vaporized gas 113 due to the lowering of the temperature of the vaporization liquid 112.The vaporized bubbles 114 that vaporize from the vaporization liquid 112 rise due to buoyancy and become part of the vaporized gas 113.

[0047] Furthermore, the vaporized gas 113 is accumulated inside the coolant tank 110, so that even if the coolant 111 is pushed out from the first pipe 180, the decrease in pressure inside the coolant tank 110 is suppressed. In other words, the pressure inside the coolant tank 110 can be maintained higher than the pressure inside the reactor pressure vessel 21 and the primary coolant pipe 25, so that coolant can be continuously supplied to the reactor pressure vessel 21 and the primary coolant pipe 25. In addition, by supplying heat to the vaporized gas 113 inside the coolant tank 110 from the temperature control device 150, the coolant 111 whose temperature is controlled by the temperature control device 150, the vaporization liquid 112, and the heat transfer promotion plate 140, the pressure drop of the vaporized gas 113 due to the vaporization heat of the vaporization liquid 112, which cools the vaporization liquid 112 and turns it into a solid or becomes cold, can be suppressed.

[0048] As described above, the second embodiment of the coolant supply system 100 allows for a simpler configuration than the first embodiment. This reduces manufacturing and construction costs. Furthermore, due to stratification caused by density differences within the coolant tank 110, the coolant 111 accumulates at the bottom of the coolant tank 110, allowing the vaporization liquid 112 to supply the coolant 111 without obstructing its injection. Additionally, by utilizing heat transfer through direct contact between the coolant 111 and the vaporization liquid 112, and heat input from the coolant 111 to the vaporization liquid 112 via the heat transfer facilitating plate 140, the temperature drop of the vaporization liquid 112 due to the heat of vaporization during reduced-pressure boiling can be suppressed, preventing or suppressing a decrease in the rate of reduced-pressure boiling and a decrease in the total amount of reduced-pressure boiling.

[0049] (Third embodiment) Next, a third embodiment of the coolant supply system according to this disclosure will be described with reference to Figure 5. Figure 5 is a diagram showing an example of the configuration of the third embodiment of the coolant supply system according to this disclosure. As shown in Figure 5, the third embodiment of the coolant supply system 100 according to this disclosure comprises a coolant tank 110, a temperature control device 150, a gate valve 160, a check valve 170, and a first pipe 180. In the third embodiment of the coolant supply system 100 according to this disclosure, all of these components except the coolant tank 110 are the operating parts. These components will be described in order below.

[0050] In the coolant tank 110 according to the third embodiment, both the coolant 111 and the vaporization liquid 112 are separated by a partition plate and stored separately. That is, in the coolant tank 110 according to the third embodiment, a partition plate is provided between the coolant 111 and the vaporization liquid 112. The coolant tank 110 can utilize the heat input from the coolant 111 to the vaporization liquid 112 via the partition plate to suppress the temperature drop of the vaporization liquid 112 due to the heat of vaporization during reduced-pressure boiling of the vaporization liquid 112, thereby preventing or suppressing a decrease in the rate of reduced-pressure boiling and a decrease in the total amount of reduced-pressure boiling. Furthermore, by separating the vaporization liquid 112 and the coolant 111 inside the coolant tank 110, it is possible to prevent the vaporization liquid 112 from dissolving into the coolant 111.

[0051] The coolant tank 110 according to the third embodiment is formed in a vacuum double-walled structure, similar to the temperature control tank 120 according to the first embodiment, and may use perlite insulation or aerogel insulation as the thermal insulation material. This suppresses the inflow of heat from the external environment, reduces the operation of the temperature control device 150 for adjusting the temperature inside the coolant tank 110, and thus reduces energy consumption.

[0052] The temperature control device 150 according to the third embodiment maintains the temperatures of both the coolant 111 and the vaporization liquid 112 at predetermined temperatures. The temperature control device 150 according to the third embodiment may be provided on the side of the coolant tank 110 where the vaporization liquid 112 is stored, or on the other side, or on the bottom surface or other surfaces of the coolant tank 110. The temperature control device 150 according to the third embodiment may have the same configuration as the temperature control device 150 according to the first embodiment.

[0053] The gate valve 160 according to the third embodiment is connected to the portion of the coolant tank 110 where the coolant 111 is stored, and is installed in the middle of the first piping 180 which connects to the reactor pressure vessel 21 and the primary coolant piping 25. The other features of the gate valve 160 according to the third embodiment may be the same as those of the gate valve 160 according to the first embodiment described above, so their description will be omitted.

[0054] The check valve 170 according to the third embodiment is connected to the portion of the coolant tank 110 in which the coolant 111 is stored, and may be located on the side of the reactor pressure vessel 21 and the primary coolant piping 25, rather than on the side of the coolant tank 110, rather than on the side of the first piping 180 in which the gate valve 160 according to the third embodiment is provided. Other features of the check valve 170 according to the third embodiment may be the same as those of the check valve 170 according to the first embodiment described above, so their description will be omitted.

[0055] In the third embodiment, the first piping 180 connects the coolant tank 110 to the reactor pressure vessel 21 and the primary coolant piping 25. As shown in Figure 5, the first piping 180 in the third embodiment may be connected to the portion of the coolant tank 110 where the coolant 111 is stored. The features of the first piping 180 in the second embodiment may be the same as those of the first piping 180 in the first embodiment described above, so their description will be omitted.

[0056] In the third embodiment of the coolant supply system 100, the pressure inside the coolant tank 110 is reduced by opening the gate valve 160, thereby causing the vaporization liquid 112 to depressurize and boil. The pressure of the vaporized gas 113, which is the gas generated by the vaporization of the vaporization liquid 112, suppresses the depressurization inside the coolant tank 110, and coolant 111 is supplied from the coolant tank 110 to the reactor pressure vessel 21 and the primary coolant piping 25.

[0057] As described above, the third embodiment of the coolant supply system 100 allows for a simplification of its configuration. Furthermore, by separating the vaporization liquid 112 and the coolant 111 inside the coolant tank 110, it is possible to prevent the vaporization liquid 112 from dissolving into the coolant 111. In addition, by utilizing the heat input from the coolant 111 to the vaporization liquid 112 via the partition plate, it is possible to suppress the temperature drop of the vaporization liquid 112 due to the heat of vaporization during reduced-pressure boiling of the vaporization liquid 112, thereby preventing or suppressing a decrease in the rate of reduced-pressure boiling and a decrease in the total amount of reduced-pressure boiling.

[0058] (Fourth embodiment) Next, a fourth embodiment of the coolant supply system according to this disclosure will be described with reference to Figure 6. Figure 6 is a diagram showing an example of the configuration of the fourth embodiment of the coolant supply system according to this disclosure. As shown in Figure 6, the fourth embodiment of the coolant supply system 100 according to this disclosure comprises a coolant tank 110, a heat-generating material tank 135, a gate valve 160, a check valve 170, and a first pipe 180. In the fourth embodiment of the coolant supply system 100 according to this disclosure, all of these components except the coolant tank 110 are the operating parts. These components will be described in order below.

[0059] The coolant tank 110 according to the fourth embodiment contains both a coolant 111 and a heat-generating material tank 135. In the coolant tank 110 according to the fourth embodiment, the coolant 111 is introduced into the heat-generating material inside the heat-generating material tank 135 by opening the gate valve 160C provided in the heat-generating material tank 135. Then, the gas generated by the evaporation of the coolant 111 due to the heat generated by the reaction between the heat-generating material and the coolant 111 flows out into the coolant tank 110 through the gate valve 160B, increasing the pressure inside the coolant tank 110 and injecting the coolant 111 into the reactor pressure vessel 21 and the primary coolant piping 25.

[0060] A lid may be provided inside the coolant tank 110, positioned on the surface of the coolant 111. The lid is a plate-shaped float that floats on the surface of the coolant 111 and serves as an insulating lid to suppress heat exchange between the gas filling the space above the surface of the coolant 111 and the coolant 111. The lid may be provided so as to cover at least a portion of the surface of the coolant 111 inside the coolant tank 110. By providing the lid, it is possible to suppress the gas inside the coolant tank 110 from being cooled and liquefied by the coolant 111. The lid may be made of any material that has a predetermined insulating property and floats on the surface of the coolant 111. For example, it may be made of expanded polystyrene.

[0061] The heat-generating substance tank 135 stores a heat-generating substance, which is a chemical substance that generates heat when it reacts with the coolant 111. Specifically, the heat-generating substance tank 135 may store calcium oxide as the heat-generating substance. However, the heat-generating substance is not limited to calcium oxide; it may be any chemical substance that generates heat when it reacts with water, such as calcium carbonate. The heat-generating substance tank 135 is equipped with a gate valve 160B located in contact with the gas phase of the coolant tank 110, and a gate valve 160C located in contact with the coolant 111.

[0062] Furthermore, the heat-generating material tank 135 is not limited to being located inside the coolant tank 110, but may also be located outside the coolant tank 110. Figure 7 shows a second aspect of the fourth embodiment of the coolant supply system according to this disclosure. As shown in Figure 7, in this case, the piping connected to the heat-generating material tank 135 and equipped with a gate valve 160B may be connected to the upper part of the heat-generating material tank 135, and the piping connected to the heat-generating material tank 135 and equipped with a gate valve 160C may be connected to the lower part of the heat-generating material tank 135 (above the connection point of the piping equipped with gate valve 160A).

[0063] The gate valve 160A according to the fourth embodiment is installed between the coolant tank 110 and the reactor pressure vessel 21 or primary coolant piping 25 to control the flow of coolant between them. The gate valve 160 according to the fourth embodiment is installed in the first piping 180 that connects the coolant tank 110 to the reactor pressure vessel 21 or primary coolant piping 25. In addition, there is a gate valve 160B installed at the location of the heat-generating material tank 135 that is in contact with the gas phase of the coolant tank 110, and a gate valve 160C installed at the location of the heat-generating material tank 135 that is in contact with the coolant 111. The gate valve 160 according to the fourth embodiment may be implemented in the same way as the gate valve 160 according to the first embodiment described above.

[0064] The first piping 180 in the fourth embodiment connects the coolant tank 110 to the reactor pressure vessel 21 and the primary coolant piping 25. The features of the first piping 180 in the fourth embodiment may be the same as those of the first piping 180 in the first embodiment described above, so their description will be omitted.

[0065] In the coolant supply system 100 according to the fourth embodiment, the supply of coolant 111 is started by receiving a control signal that simultaneously opens gate valve 160B and gate valve 160C. Specifically, by opening gate valves 160B and 160C, the coolant 111 in the coolant tank 110 is introduced into the heat-generating material inside the heat-generating material tank 135. As a result, the gas generated by the evaporation of the coolant 111 due to the heat generated by the heat-generating material is passed through gate valve 160B and flows into the coolant tank 110, thereby increasing the pressure inside the coolant tank 110. At the same time, by opening gate valve 160A, the coolant from the coolant tank 110 can be injected into the reactor pressure vessel 21 and the primary coolant piping 25.

[0066] Here, the gate valve 160C may also be a check valve. The gate valve 160C, acting as a check valve, prevents the flow of coolant 111 from the coolant tank 110 to the heat-generating substance tank 135 when the pressure in the coolant tank 110 is lower than the pressure in the heat-generating substance tank 135. In this case, when the coolant supply system 100 is not in operation, the pressure in the heat-generating substance tank 135 is kept higher than the pressure in the coolant tank 110. As a result, the gate valve 160C, acting as a check valve, prevents the flow of coolant 111 from the coolant tank 110 to the heat-generating substance tank 135. On the other hand, when the coolant supply system 100 is activated, the gate valve 160B is opened to equalize the pressure in the heat-generating substance tank 135 with the pressure in the coolant tank 110. Due to the natural circulation that occurs at this time, coolant 111 flows from the coolant tank 110 to the heat-generating substance tank 135 via the gate valve 160C.

[0067] Furthermore, the gate valve 160B may also be a check valve. The gate valve 160B acting as a check valve prevents the gas phase inside the coolant tank 110 from flowing into the heat-generating material tank 135 during standby. By opening the gate valve 160C, the coolant 111 flows from the coolant tank 110 into the heat-generating material tank 135, and gas is generated by the reaction with the heat-generating material, causing the pressure inside the heat-generating material tank 135 to rise. Due to this pressure increase, the steam generated inside the heat-generating material tank 135 passes through the gate valve 160B acting as a check valve and flows out to the top of the coolant tank 110, increasing the pressure. This natural circulation continues, maintaining the high pressure inside the coolant tank 110 and injecting coolant into the reactor pressure vessel 21 and the primary coolant piping 25.

[0068] In other words, one of the gate valves 160B and 160C installed in the heat-generating material tank 135 may be a check valve. Although gate valves 160B and 160C are named gate valves, the fact that one of them may be a check valve means that they fall within the equivalence of the meaning of gate valve.

[0069] The check valve 170 according to the fourth embodiment may be connected to the portion of the coolant tank 110 where the coolant 111 is stored, and may be provided in the first piping 180 which is connected to the reactor pressure vessel 21 and the primary coolant piping 25. The other features of the check valve 170 according to the fourth embodiment may be the same as those of the check valve 170 according to the first embodiment described above, so their description will be omitted.

[0070] As described above, according to the fourth embodiment of the coolant supply system 100, by using boiling and evaporation caused by the heat generated by the chemical reaction between the coolant and the heat-generating substance as the driving force, passive high-pressure water injection without the need for dynamic equipment such as pumps can be achieved. Furthermore, during standby, unwanted chemical reactions can be suppressed by sealing the container that stores the heat-generating substance.

[0071] (Regarding the control device) Next, the configuration of the control device 300 according to this disclosure will be described with reference to Figure 8. Figure 8 is a diagram showing an example of the configuration of the control device according to this disclosure. As shown in Figure 8, the control device 300 according to this disclosure comprises a communication unit 310, a storage unit 320, a control unit 330, an input unit 340, and a display unit 350. As described above, the control device 300 may comprehensively control the nuclear equipment 1, or it may control the coolant supply system 100 as part of the configuration of the coolant supply system 100. These configurations will be described in order below.

[0072] The communication unit 310 is responsible for transmitting and receiving information with external devices and equipment. Specifically, the communication unit 310 is responsible for transmitting and receiving information with various measuring instruments of the nuclear facility 1. The communication unit 310 may be implemented by, for example, a wireless LAN (Local Area Network) card, a serial communication interface device, an antenna, etc. Alternatively, the communication unit 310 may be implemented by a HART (Highway Addressable Remote Transducer) communication modem, a ProfibusDP (registered trademark) communication connector, etc.

[0073] The memory unit 320 is a storage device that stores various types of information. The memory unit 320 comprises a main memory and an auxiliary storage device. The main memory may be implemented using semiconductor memory elements such as RAM (Random Access Memory), ROM (Read Only Memory), or flash memory. The auxiliary storage device may be implemented using a hard disk or an SSD (Solid State Drive).

[0074] The measurement data storage unit 321 stores information relating to various measurement data of the nuclear facility 1. Here, an example of the information stored in the measurement data storage unit 321 will be explained using Figure 9. Figure 9 is a diagram showing an example of the information stored in the measurement data storage unit of the control device according to this disclosure.

[0075] As shown in Figure 9, the measurement data storage unit 321 stores information related to the following items: "measurement time," "first pressure measurement value," "first temperature measurement value," and "first flow rate measurement value."

[0076] "Measurement Time" indicates the date and time the measurement data was taken. "First Pressure Measurement" indicates the pressure measurement value at the first location of Nuclear Facility 1. "First Temperature Measurement" indicates the temperature measurement value at the first location of Nuclear Facility 1. "First Flow Rate Measurement" indicates the flow rate measurement value at the first location of Nuclear Facility 1.

[0077] Furthermore, the measurement data storage unit 321 may store measurement values ​​from any additional locations.

[0078] In other words, Figure 9 shows an example in which the first pressure measurement value "PRMS#1", the first temperature measurement value "TMMS#1", and the first flow rate measurement value "MFMS#1", all measured at measurement time "TIME#1", are linked and stored in memory.

[0079] Furthermore, the information stored in the measurement data storage unit 321 is not limited to information relating to the items "measurement time," "first pressure measurement value," "first temperature measurement value," and "first flow rate measurement value," but may also store any other information relating to various measurement data of the nuclear equipment 1.

[0080] The control unit 330 is implemented by a CPU (Central Processing Unit) or MPU (Micro Processing Unit), etc., which executes various programs stored in the memory unit 320 using RAM as the working area. Alternatively, the control unit 330 may be implemented by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0081] As shown in Figure 8, the control unit 330 includes an acquisition unit 331, a determination unit 332, an open unit 333, and a stop unit 334. The control unit 330 realizes these functions and performs these processes by reading and executing a program (software) from the storage unit 320. These functions of the control unit 330 may also be realized by electronic circuits. Furthermore, the control unit 330 may execute these processes with a single CPU, or it may have multiple CPUs and execute these processes in parallel with the multiple CPUs. These configurations will be described in detail below.

[0082] The acquisition unit 331 acquires various measurement data related to the nuclear equipment 1. For example, the acquisition unit 331 acquires various measurement data from measuring instruments connected via the communication unit 310. Specifically, the acquisition unit 331 may acquire pressure measurements of the reactor pressure vessel 21, water level measurements of the pressurizer 22, steam flow rate measurements of the main steam piping, temperature measurements of the primary coolant, pressure measurements of the main steam piping, and so on.

[0083] The determination unit 332 determines whether or not to activate the coolant supply system 100 based on various measured values ​​related to the nuclear equipment 1. The determination method used by the determination unit 332 may be arbitrary, but for example, the determination unit 332 may determine whether the pressure drop in the reactor pressure vessel 21 coincides with the drop in the water level inside the pressurizer 22 and the reactor pressure vessel 21. The determination unit 332 may also determine whether there is an abnormal drop in the pressure measurement value of the reactor pressure vessel 21. The determination unit 332 may also determine whether there is a coincidence between a high main steam flow rate and an abnormal drop in the average temperature of the primary coolant. The determination unit 332 may also determine whether there is a coincidence between a high main steam flow rate and a drop in main steam pressure. The determination unit 332 may also determine whether there is an increase in the main steam differential pressure and a decrease in main steam pressure. The determination unit 332 may also determine to activate the coolant supply system 100 if multiple of these conditions are met.

[0084] Events that satisfy these conditions include the outflow of primary cooling water into the secondary cooling water system due to the rupture of heat transfer tubes in the steam generator 23, and a decrease in the pressure of the reactor pressure vessel 21 due to the misopening of the spray valve and the relief valve of the pressurizer 22. Furthermore, issues related to the secondary cooling water system include excessive opening or failure to close the turbine bypass valve, and the misopening of the main steam control valve, main steam isolation valve, main steam safety valve, and main steam relief valve. Additionally, a malfunction in the feedwater control system can lead to excessive feedwater, resulting in high main steam flow rate and a decrease in main steam pressure.

[0085] The opening unit 333 activates the coolant supply system 100 by opening the gate valve 160. Specifically, the opening unit 333 opens the gate valve 160 by transmitting a control signal to open the gate valve 160 via the communication unit 310.

[0086] The stop unit 334 stops the coolant supply system 100 by shutting off the gate valve 160. Specifically, the stop unit 334 shuts off the gate valve 160 by transmitting a control signal via the communication unit 310 to shut off the gate valve 160.

[0087] The input unit 340 receives various operational information from the operation manager and others. The input unit 340 may be implemented using input devices such as a keyboard, mouse, lever, or switch. The operation manager inputs operational information for operating various equipment of the nuclear facility 1, as well as operational information for displaying a GUI (Graphical User Interface) that shows various information, via the input unit 340.

[0088] The display unit 350 is a display device that displays various types of information. For example, the display unit 350 may display flow rate measurements, pressure measurements, temperature measurements, etc., related to the nuclear power plant equipment 1 in a time-series graph. The display unit 350 may be implemented using, for example, a liquid crystal display, an organic EL (Electro Luminescence) display, a micro LED (Light Emitting Diode) display, etc.

[0089] As described above, the control device 300 can appropriately activate the coolant supply system 100 when it becomes necessary to activate it. It can also appropriately stop the coolant supply system 100.

[0090] (Regarding the coolant supply method) Next, the coolant supply method relating to this disclosure will be explained using Figure 10. Figure 10 is a flowchart showing the flow of the coolant supply method relating to this disclosure. The coolant supply method relating to this disclosure will be explained in accordance with the flow shown in Figure 10.

[0091] First, the control device 300 acquires various measurement data related to the nuclear equipment 1 (step S101). Next, the control device 300 determines whether to supply coolant based on the measurement data (step S102). If it is determined in step S102 to supply coolant (step S103: Yes), the control device 300 transmits a control signal to open the gate valve 160 (step S104). Next, the control device 300 determines whether to stop supplying coolant based on the measurement data (step S105). If it is determined in step S105 to stop supplying coolant (step S106: Yes), the control device 300 transmits a control signal to shut off the gate valve 160 (step S107).

[0092] If, in step S103, it is determined not to supply the coolant (step S103: No), the control device 300 returns to step S101 and executes the subsequent processes.

[0093] Furthermore, if it is not determined in step S106 to stop the supply of the coolant (step S106: No), the control device 300 returns to step S105 and executes the processing after acquiring the measurement data (step S108). However, the processing from step S105 onwards is not mandatory; it may or may not be performed. In other words, in this method, once the supply of the coolant has started, it is not necessary to perform the process of stopping the supply of the coolant (in this case, the process of shutting off the gate valve 160). In other words, in this example, the gate valve 160 may be left open.

[0094] According to the coolant supply method described above, when it is determined that coolant supply is necessary based on various measurement values ​​related to the nuclear equipment 1, a control signal is transmitted to open the gate valve 160, thereby initiating the supply of coolant. Therefore, a coolant supply method that can appropriately supply coolant can be provided.

[0095] (Hardware configuration) The control device 300 according to the above-described embodiment is implemented by a computer 1000 having the configuration shown in Figure 11. Figure 11 is a hardware configuration diagram showing an example of a computer that implements the functions of the control device according to this disclosure. The computer 1000 is connected to an output device 1010 and an input device 1020, and has a configuration in which an arithmetic unit 1030, a primary storage device 1040, a secondary storage device 1050, an output IF (Interface) 1060, an input IF 1070, and a network IF 1080 are connected by a bus 1090.

[0096] The arithmetic unit 1030 operates based on programs stored in the primary storage device 1040 and the secondary storage device 1050, as well as programs read from the input device 1020, and executes various processes. The primary storage device 1040 is a memory device, such as RAM, that temporarily stores data used by the arithmetic unit 1030 for various calculations. The secondary storage device 1050 is a storage device that stores data used by the arithmetic unit 1030 for various calculations and various databases, and is implemented using ROM, HDD, flash memory, etc.

[0097] Output IF1060 is an interface for transmitting information to be output to output devices 1010, such as monitors and printers, and is implemented using connectors of standards such as USB (Universal Serial Bus), DVI (Digital Visual Interface), and HDMI (High Definition Multimedia Interface). Input IF1070 is an interface for receiving information from various input devices 1020, such as mice, keyboards, and scanners, and is implemented using, for example, USB.

[0098] The input device 1020 may also be a device that reads information from, for example, an optical recording medium such as a CD (Compact Disc), DVD (Digital Versatile Disc), or PD (Phase Change Rewritable Disk), a magneto-optical recording medium such as an MO (Magneto-Optical disk), tape media, magnetic recording media, or semiconductor memory. Furthermore, the input device 1020 may also be an external storage medium such as a USB memory stick.

[0099] Network IF1080 receives data from other devices via network N and sends it to the arithmetic unit 1030, and also transmits data generated by the arithmetic unit 1030 to other devices via network N.

[0100] The arithmetic unit 1030 controls the output device 1010 and the input device 1020 via the output IF 1060 and the input IF 1070. For example, the arithmetic unit 1030 loads a program from the input device 1020 or the secondary storage device 1050 onto the primary storage device 1040 and executes the loaded program.

[0101] For example, when computer 1000 functions as control device 300, the arithmetic unit 1030 of computer 1000 executes a program loaded onto the primary storage device 1040 to realize the functions of the control unit 330 of the control device 300.

[0102] (Structure and effect) The first embodiment of the coolant supply system 100 is a coolant supply system 100 that supplies coolant to a nuclear facility 1, and comprises a coolant tank 110 in which coolant is stored, and an operating unit that vaporizes a vaporization liquid, accumulates the gas produced by vaporization inside the coolant tank 110 to increase the pressure, and supplies coolant from the coolant tank 110.

[0103] With this configuration, the vaporization liquid is vaporized, and the gas produced by vaporization is accumulated inside the coolant tank 110 to increase or maintain high pressure, thereby supplying coolant from the coolant tank 110. Therefore, it is not necessary to prepare a power source for the coolant, such as a pump. Thus, a coolant supply system 100 that can properly supply coolant can be provided.

[0104] The coolant supply system 100 according to the second embodiment is the coolant supply system 100 according to the first embodiment, further comprising a temperature control tank 120 in which coolant is stored, and the operating unit comprises a vaporization liquid tank 130 provided inside the temperature control tank 120 for storing vaporization liquid, a gate valve 160 for controlling the flow of gas produced by the vaporization of the vaporization liquid from the vaporization liquid tank 130 to the coolant tank 110, and a temperature control device 150 for maintaining the coolant in the temperature control tank 120 at a predetermined temperature.

[0105] With this configuration, the vaporizing liquid inside the vaporizing liquid tank 130 provided in the temperature control material tank 120 is vaporized, and the vaporized gas is supplied to the coolant tank 110, thereby supplying the coolant. Therefore, a coolant supply system 100 that can properly supply the coolant can be provided.

[0106] The coolant supply system 100 according to the third embodiment is the coolant supply system 100 according to the first or second embodiment, and the operating unit comprises a check valve 170 that prevents backflow of coolant from the nuclear equipment 1 to the coolant tank 110, a gate valve 160 that controls the flow of coolant from the coolant tank 110 to the nuclear equipment 1, and a temperature control device 150 that maintains the coolant and vaporization liquid at a predetermined temperature, and the vaporization liquid is stored in the coolant tank 110 together with the coolant.

[0107] With this configuration, opening the gate valve 160 reduces the pressure in the coolant tank 110, causing the vaporization liquid to boil under reduced pressure. This suppresses the pressure drop in the coolant tank 110, allowing the coolant to be supplied over a long period. Therefore, a coolant supply system 100 that can properly supply coolant can be provided.

[0108] The coolant supply system 100 according to the fourth embodiment is a coolant supply system 100 according to any one of the first to third embodiments, and the operating unit comprises a check valve 170 that prevents backflow of coolant from the nuclear equipment 1 to the coolant tank 110, a gate valve 160 that controls the flow of coolant from the coolant tank 110 to the nuclear equipment 1, and a temperature control device 150 that maintains the vaporization liquid and coolant at a predetermined temperature, and the coolant tank 110 is provided with a partition plate that separates the coolant and the vaporization liquid, and the two are stored in isolation.

[0109] With this configuration, opening the gate valve 160 reduces the pressure in the coolant tank 110, causing the vaporization liquid to boil under reduced pressure. This suppresses the pressure drop in the coolant tank 110, allowing the coolant to be supplied over a long period of time. Therefore, a coolant supply system 100 that can properly supply coolant can be provided.

[0110] The fifth embodiment of the coolant supply system 100 is a coolant supply system 100 according to any one of the first to fourth embodiments, and the operating unit comprises a check valve 170 that prevents the backflow of coolant from the nuclear equipment 1 to the coolant tank 110, a gate valve 160A that controls the flow of coolant from the coolant tank 110 to the nuclear equipment 1, and a heat-generating substance tank 135 provided inside the coolant tank 110 and containing a heat-generating substance which is a chemical substance that generates heat when it reacts with the coolant in the coolant tank 110.

[0111] With this configuration, the heat-generating substance is reacted with the coolant in the coolant tank 110 to generate heat, vaporize the coolant, and increase the pressure in the coolant tank 110, thereby supplying the coolant. Therefore, a coolant supply system 100 that can properly supply the coolant can be provided.

[0112] The first embodiment of the coolant supply method is a coolant supply method using a coolant supply system 100 according to any one of the first to fifth embodiments, and includes the steps of: acquiring measurement values ​​related to the nuclear equipment 1; determining whether or not it is necessary to supply coolant to the nuclear equipment 1 based on the measurement values; and, if it is determined that it is necessary to supply coolant, transmitting a control signal to open the gate valve 160.

[0113] With this configuration, if it is determined that coolant supply is necessary based on various measurement values ​​related to the nuclear equipment 1, a control signal is transmitted to open the gate valve 160, thereby initiating the supply of coolant. Therefore, a coolant supply method that can appropriately supply coolant can be provided.

[0114] The program according to the first embodiment is a program that causes a computer of a coolant supply system 100 according to any one of the first to fifth embodiments to execute processing, and includes the steps of: acquiring measured values ​​related to the nuclear equipment 1; determining whether or not it is necessary to supply coolant to the nuclear equipment 1 based on the measured values; and, if it is determined that it is necessary to supply coolant, transmitting a control signal to open the gate valve 160.

[0115] With this configuration, if it is determined that coolant supply is necessary based on various measurement values ​​related to the nuclear equipment 1, a control signal is sent to open the gate valve 160, thereby initiating the supply of coolant. Therefore, a program that can appropriately supply coolant can be provided.

[0116] Although embodiments of the present disclosure have been described above, the embodiments are not limited to those described herein. Furthermore, the aforementioned components include those that can be easily conceived by those skilled in the art, those that are substantially the same, and those that fall within the so-called equivalent range. Moreover, the aforementioned components can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the gist of the embodiments described above. [Explanation of symbols]

[0117] 1 Nuclear equipment 100 Coolant supply system 110 Coolant Tank 111 Coolant 112 Vaporizing Liquids 113 Vaporized gas 114 Vaporized bubbles 120 Temperature control material tank 121 Temperature control material 130 Liquid tank for vaporization 131. Liquids for vaporization 132 Vaporized gas 135 Heat-generating material tank 140 Heat transfer accelerating plate 150 Temperature control device 160 Gate valve 170 Check valve 180 First Piping 190 Second piping 20. Reactor containment vessel 21. Reactor pressure vessel 22 Pressurizer 23 Steam generator 24 Coolant pump 25 Primary coolant piping 26 Secondary coolant piping 200 Reactor Department 300 Control device 310 Communications Department 320 Storage section 321 Measurement data storage unit 330 Control Unit 331 Acquisition Department 332 Judgment section 333 Open area 334 Stop part 340 Input section 350 Display section 1000 computers 1010 Output device 1020 Input device 1030 Arithmetic equipment 1040 Primary storage 1050 Secondary storage 1060 Output IF 1070 Input IF 1080 Network Interface 1090 Bus N Network

Claims

1. A coolant supply system that supplies coolant to nuclear power facilities, A coolant tank in which the coolant is stored, The device comprises an operating unit that vaporizes a vaporization liquid, accumulates the resulting gas inside the coolant tank to increase the pressure, and supplies coolant from the coolant tank. Coolant supply system.

2. It further includes a temperature control tank in which coolant is stored, The aforementioned operating part is A vaporization liquid tank is provided inside the temperature control material tank for storing the vaporization liquid, A gate valve controls the flow of the gas produced by the vaporization of the liquid vapor from the liquid vaporization tank to the coolant tank, The system includes a temperature control device that maintains the coolant in the temperature control tank at a predetermined temperature. The coolant supply system according to claim 1.

3. The aforementioned operating part is A check valve to prevent the backflow of coolant from the nuclear equipment to the coolant tank, A gate valve that controls the flow of coolant from the coolant tank to the nuclear power plant, The system comprises the coolant and a temperature control device for maintaining the vaporization liquid at a predetermined temperature. The coolant tank stores the coolant along with the vaporization liquid. The coolant supply system according to claim 1.

4. The aforementioned operating part is A check valve to prevent the backflow of coolant from the nuclear equipment to the coolant tank, A gate valve that controls the flow of coolant from the coolant tank to the nuclear power plant, The system includes a temperature control device for maintaining the vaporized liquid at a predetermined temperature, The coolant tank is provided with a partition plate that separates the coolant and the vaporization liquid, and the two are stored in a separated state. The coolant supply system according to claim 1.

5. The aforementioned operating part is A check valve to prevent the backflow of coolant from the nuclear equipment to the coolant tank, A gate valve that controls the flow of coolant from the coolant tank to the nuclear power plant, The system comprises a heat-generating substance tank provided inside the coolant tank, which contains a heat-generating substance, a chemical substance that generates heat by reacting with the coolant in the coolant tank, The coolant supply system according to claim 1.

6. A method for supplying a coolant using the coolant supply system described in any one of claims 1 to 5, The steps include: obtaining measurement values ​​related to the aforementioned nuclear equipment; A step of determining whether or not it is necessary to supply coolant to the nuclear facility based on the measured values, The procedure includes the step of transmitting a control signal to open a gate valve that controls the flow of coolant from the coolant tank to the nuclear equipment when it is determined that a supply of coolant is necessary, Coolant supply method.

7. A program that causes a computer in a coolant supply system according to any one of claims 1 to 5 to perform processing, The steps include: obtaining measurement values ​​related to the aforementioned nuclear equipment; A step of determining whether or not it is necessary to supply coolant to the nuclear facility based on the measured values, The procedure includes the step of transmitting a control signal to open a gate valve that controls the flow of coolant from the coolant tank to the nuclear equipment when it is determined that a supply of coolant is necessary, program.

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