Fast reactor preheating power supply system

Abstract

To shorten the line length of a cable connected to a power source panel while keeping maintainability of the power source panel, in a preheating power source system of a fast reactor.SOLUTION: A preheating power source system is provided, comprising: cooling system piping connected to a nuclear reactor vessel chamber; an air-atmosphere equipment and piping chamber including a plurality of preheating heaters for preheating the cooling system piping, and cooling system equipment; and a power source chamber in which a power source unit for supplying power source to the preheating heaters is provided. The cooling system piping is double piping, and the cooling system equipment has double-vessel structure. In the equipment and piping chamber, the cooling system piping is divided into a plurality of blocks, and a preheating heater is arranged in each divided block in the cooling system piping, the preheating power source system further comprises a preheating power source panel which is switched, for each block, between supply and non-supply of power source supplied from the power source unit to the plurality of preheating heaters.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a preheating power supply system for a fast reactor. [Background technology]

[0002] A preheating power supply system for a fast reactor that uses liquid metal to cool the reactor is known. In this preheating power supply system, the piping and equipment are preheated with a heater before the liquid metal coolant is received, thereby preventing the piping and equipment from being subjected to a sudden thermal change and preventing the liquid metal from freezing (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-142391 Summary of the Invention [Problem to be solved by the invention]

[0004] The preheating of the piping and equipment by such a preheating power supply system uses sodium as the liquid metal circulated as a coolant, so that the preheating is performed in a room with a nitrogen atmosphere to prevent sodium from reacting with air in the event of leakage. In this case, since workers cannot easily enter and exit the nitrogen atmosphere room, a power supply panel for supplying power to the heater is placed in a room with an air atmosphere different from the nitrogen atmosphere room, so that the power supply panel can be easily maintained. In this case, since the power supply panel and the heater are placed in separate rooms, there is a problem that the cable length becomes long.

[0005] Therefore, the present invention has been made in consideration of these points, and has an object to shorten the length of cables connected to a power supply panel in a preheating power supply system of a fast reactor while maintaining the maintainability of the power supply panel. [Means for solving the problem]

[0006] In a first aspect of the present invention, there is provided a preheating power supply system for a fast reactor that cools a core of a reactor using liquid metal, the preheating power supply system comprising: a cooling system piping connected to a reactor vessel chamber in a nitrogen atmosphere in which a reactor vessel containing the core is provided; a plurality of preheaters for preheating the cooling system piping; an equipment and piping chamber in an air atmosphere having cooling system equipment for circulating the liquid metal; and a power supply chamber in which a power supply unit for supplying power to the preheater is provided, the cooling system piping comprising an inner pipe for transporting the liquid metal, and a cooling system device for circulating the liquid metal. the cooling system equipment has a double container structure including an internal device containing the liquid metal and an outer tube container arranged to cover the internal device, the equipment / piping room has the cooling system piping divided into a plurality of blocks, the preheater is disposed on the cooling system piping for each divided block, and the equipment / piping room further has a preheating power supply panel which switches for each block whether or not to supply power supplied from the power supply unit to the plurality of preheaters.

[0007] The equipment / piping room may be arranged for each divided block of the cooling system piping, and may further include a plurality of temperature sensors for detecting the temperature of the cooling system piping, and the preheating power supply system may further include a preheating control panel that determines whether or not to supply power to the preheating heater of one block based on the temperature detection result of the temperature sensor of the one block, and supplies a control signal based on the determination result to the preheating power supply panel.

[0008] The signal line for transmitting the control signal from the pre-heating control panel to the pre-heating power supply panel may be a multi-core cable covered with a plastic material coating.

[0009] The equipment / piping room is provided with a plurality of the preheaters and the preheating power supply panel, and further includes a terminal box electrically connected to the cables of the plurality of preheaters and the preheating power supply panel, respectively, and the cable between the terminal box and the preheating power supply panel may be a multi-core cable covered with a plastic material coating.

[0010] The power supply unit may have a three-phase, four-wire distribution line that transmits three-phase AC current using four distribution lines, namely, three voltage lines and one neutral line, and each of the preheaters may have one end commonly connected to the neutral line and the other end connected to a corresponding one of the three voltage lines. Effect of the Invention

[0011] According to the present invention, in a preheating power supply system for a fast reactor, the length of a cable connected to a power supply panel can be shortened while maintaining the maintainability of the power supply panel. [Brief description of the drawings]

[0012] [Figure 1] 1 shows an example of the configuration of a conventional pre-heating power supply system 10. [Diagram 2] 1 shows an example of the configuration of a pre-heating power supply system 20 according to the present embodiment. [Diagram 3] 1 shows a first example of an electrical connection configuration from a power supply unit 141 to a preheater 121 according to this embodiment. [Figure 4] 2 shows a second example of an electrical connection configuration from the power supply unit 141 to the preheater 121 according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] <Configuration example of conventional preheating power supply system 10> Fig. 1 shows an example of the configuration of a conventional preheating power supply system 10. Fig. 1 shows an example of the preheating power supply system 10 for a fast reactor in which a coolant using liquid metal circulates through a reactor vessel 101, cooling system piping 110, and cooling system equipment 125. The preheating power supply system 10 preheats the piping and equipment through which the liquid metal circulates in a room with a nitrogen atmosphere. The preheating power supply system 10 includes a reactor vessel room 100, a cooling system piping 110, an equipment / piping room 120, cooling system equipment 125, a control panel room 130, and a power supply room 140.

[0014] The reactor vessel room 100 is provided with a reactor vessel 101. The reactor vessel 101 houses a reactor core and an internal support structure, and holds a coolant therein. The reactor vessel 101 is connected to a cooling system piping 110 for circulating liquid metal for cooling the reactor core. The cooling system piping 110 is provided so as to enable the transfer of liquid metal between the reactor vessel room 100 and an equipment and piping room 120.

[0015] An example of the liquid metal includes metallic sodium. Metallic sodium undergoes violent chemical reactions with many substances, including air, water, and water vapor. Therefore, the inside of the reactor vessel room 100 and the equipment and piping room 120 are made into a nitrogen atmosphere in order to prevent fire, explosion, etc., even if the liquid metal leaks. Note that the structure, operation, etc. of the reactor are known technologies, and detailed explanations are omitted.

[0016] The equipment / piping room 120 is connected to the cooling system piping 110, and has cooling system equipment 125 such as a pump for circulating liquid metal between the reactor vessel 101 and the equipment / piping room 120. It is preferable that the equipment / piping room 120 is adjacent to the reactor vessel room 100. A plurality of equipment / piping rooms 120 may be provided. FIG. 1 shows an example in which one equipment / piping room 120 is provided adjacent to the reactor vessel room 100, and the shaded reactor vessel room 100 and the equipment / piping room 120 are in a nitrogen atmosphere. The equipment / piping room 120 has a preheater 121, a temperature sensor 122, a terminal box 123, and a sensor connection board 124.

[0017] The preheater 121 is provided to preheat the cooling system piping 110 and the cooling system equipment 125. Fig. 1 shows an example in which the preheater 121 is indicated as H. The preheater 121 preheats the cooling system piping 110 and the cooling system equipment 125 before the liquid metal is introduced into the cooling system piping 110 and the cooling system equipment 125 in order to prevent a sudden thermal change from occurring even when liquid metal having a high temperature compared to room temperature is introduced into the cooling system piping 110, and also to prevent the temperature of the liquid metal from dropping below its melting point and freezing.

[0018] Further, the preheater 121 is controlled to stabilize the temperatures of the cooling system piping 110 and the cooling system equipment 125 based on the temperature detection result of the temperature sensor 122. For example, in the equipment / piping room 120, the cooling system piping 110 and the cooling system equipment 125 are divided into a plurality of blocks, a preheater is disposed in the cooling system piping 110 and the cooling system equipment 125 for each divided block, and the preheater 121 is output-controlled for the cooling system piping 110 and the cooling system equipment 125 for each block.

[0019] The temperature sensor 122 detects the temperatures of the cooling system piping 110 and the cooling system equipment 125. Fig. 1 shows an example in which the temperature sensor 122 is indicated as T. For example, a plurality of temperature sensors 122 are arranged for each block into which the cooling system piping 110 is divided, and detect the temperature of the cooling system piping 110 in each block. As an example, the temperature sensor 122 is a thermocouple.

[0020] The terminal box 123 is electrically connected to cables of the multiple preheaters 121. The terminal box 123 distributes power input from a preheating power supply panel 142 provided outside the equipment / piping room 120 to each of the preheaters 121 and supplies it to each preheater 121. The preheating power supply panel 142 will be described later. A plurality of terminal boxes 123 may be provided in the equipment / piping room 120. In this case, it is desirable that one terminal box 123 is connected to the preheaters 121 provided in one or more blocks.

[0021] The sensor connection board 124 is provided between the multiple temperature sensors 122 and a pre-heating control board 131 in the control board room 130, which will be described later, and is electrically connected to the cables of the multiple temperature sensors 122 and the pre-heating control board 131. In other words, the sensor connection board 124 electrically relays between the pre-heating control board 131 and the multiple temperature sensors 122. A plurality of sensor connection boards 124 may be provided in the equipment / piping room 120.

[0022] The control panel room 130 is an air-filled room and has a preheating control panel 131. The preheating control panel 131 is electrically connected to a plurality of temperature sensors 122 via a sensor connection panel 124, and acquires the temperature detection results of the plurality of temperature sensors 122. The preheating control panel 131 is also electrically connected to a preheating power supply panel 142, and transmits to the preheating power supply panel 142 a control signal for opening and closing an electromagnetic contactor provided in the preheating power supply panel 142.

[0023] For example, the preheating control panel 131 determines whether or not to supply power to the preheater 121 of one block based on the temperature detection result of the temperature sensor 122 of one block, and supplies a control signal based on the determination result to the preheating power supply panel 142. In this way, the preheating control panel 131 controls the temperatures of the cooling system piping 110 and the cooling system equipment 125 for each block so that the temperatures of the liquid metal transported by the cooling system piping 110 and the cooling system equipment 125 are within a substantially constant temperature range. As an example, the preheating control panel 131 controls the temperature of the cooling system piping 110 so that the temperature of the liquid metal is about 200°C.

[0024] The power supply room 140 is a room with an air atmosphere, and includes a power supply unit 141 and a preheating power supply panel 142. The power supply unit 141 supplies power to the preheater 121 via the preheating power supply panel 142.

[0025] The preheating power supply panel 142 switches for each block whether or not to supply the power supplied by the power supply unit 141 to the multiple preheaters 121. The preheating power supply panel 142 has multiple electromagnetic contactors that switch whether or not to supply power to the preheaters 121 based on a control signal input from the preheating control panel 131.

[0026] The control panel room 130 and the power supply room 140 are provided at a position away from the reactor vessel room 100 to facilitate maintenance and inspection. As described above, in the conventional pre-heating power supply system 10, the pre-heating control panel 131 and the pre-heating power supply panel 142 are provided at a position away from the reactor vessel room 100, and adjust the temperature of the cooling system piping 110 and the cooling system equipment 125 in the equipment and piping room 120 under a nitrogen atmosphere. In such a pre-heating power supply system 10, the distance between the pre-heating power supply panel 142 and the pre-heater 121 is long, and the cable length is long.

[0027] Here, in order to shorten the cable length, it is conceivable to place the pre-heating power supply panel 142 in the equipment / piping room 120. However, in this case, maintenance and inspection of the pre-heating power supply panel 142 would require draining the sodium and replacing the nitrogen in the equipment / piping room 120 with air beforehand, which would make maintenance difficult. Therefore, the pre-heating power supply system 20 according to this embodiment makes it possible to shorten the cable length connected to the pre-heating power supply panel 142 while maintaining the maintainability of the pre-heating power supply panel 142. Such a pre-heating power supply system 20 will be described next.

[0028] <Configuration example of preheating power supply system 20> FIG. 2 shows an example of the configuration of the preheating power supply system 20 according to this embodiment. As in FIG. 1, FIG. 2 shows an example of the preheating power supply system 10 of a fast reactor in which liquid metal is circulated through a reactor vessel 101, a cooling system piping 210, and cooling system equipment 213. In the preheating power supply system 20, parts that operate in substantially the same manner as those in the conventional preheating power supply system 10 shown in FIG. 1 are given the same reference numerals, and duplicated explanations are omitted. The preheating power supply system 20 preheats the piping and equipment that circulates the liquid metal in a room with an air atmosphere, while preventing sodium contained in the liquid metal from leaking and reacting with the air. The preheating power supply system 20 includes a reactor vessel room 100, a cooling system piping 210, an equipment / piping room 120, a cooling system equipment 213, a control panel room 130, and a power supply room 140.

[0029] A cooling system piping 210 is connected to the reactor vessel 101 of the reactor vessel room 100 according to this embodiment. The cooling system piping 210 is a piping for circulating liquid metal for cooling the inside. The atmosphere in the reactor vessel room 100 is a nitrogen atmosphere, as in the conventional case.

[0030] The cooling system piping 210 is provided so as to be able to transfer liquid metal between the reactor vessel room 100 and the equipment / piping room 120. The cooling system piping 210 is a double piping including an inner pipe 211 for transferring liquid metal and an outer pipe 212 provided so as to surround the periphery of the inner pipe 211. The cooling system equipment 213 is a double container structure including an internal equipment 214 containing liquid metal and an outer cylinder container 215 provided so as to cover the internal equipment 214. Even if the liquid metal to be transferred leaks from the inner pipe 211, such double piping can prevent the liquid metal from leaking to the outside of the cooling system piping 210 because the outer pipe 212 covers the inner pipe 211. Similarly, even if the liquid metal to be transferred leaks from the internal equipment 214, the double container structure can prevent the liquid metal from leaking to the outside of the cooling system equipment 213 because the outer cylinder container 215 covers the internal equipment 214.

[0031] The equipment / piping room 120 is connected to such a cooling system piping 210. The equipment / piping room 120 can prevent leakage of liquid metal by making the cooling system piping 210 a double pipe and by making the cooling system equipment 213 a double container structure. Therefore, the atmosphere inside the equipment / piping room 120 can be an air atmosphere. This makes it easier for workers to enter and exit the equipment / piping room 120, and improves the maintainability of the equipment inside the equipment / piping room 120 compared to when the atmosphere is nitrogen. Therefore, the equipment / piping room 120 according to this embodiment has a preheating power supply panel 142 in addition to the preheating heater 121, the temperature sensor 122, the terminal box 123, and the sensor connection panel 124.

[0032] The terminal box 123 is provided in the equipment / piping room 120 between the multiple preheaters 121 and the preheating power supply panel 142, and is electrically connected to the cables of the multiple preheaters 121 and the preheating power supply panel 142. In other words, the terminal box 123 electrically relays between the electromagnetic contactors of the preheating power supply panel 142 and the preheaters 121.

[0033] The terminal box 123 supplies power input from the preheating power supply panel 142 to each preheater 121 via cables distributed and connected to each preheater 121. Since the preheating power supply panel 142 is provided in the equipment / piping room 120, the length of the cables connecting the preheating power supply panel 142 and the terminal box 123 can be shortened. Furthermore, the number of cables connecting the preheating power supply panel 142 and the terminal box 123 is greater than the number of cables connecting the power supply unit 141 and the preheating power supply panel 142. Therefore, the amount of cables from the power supply unit 141 to the terminal box 123 can be reduced.

[0034] Here, the electric capacity of each preheater 121 is relatively small, and the cables connected to the preheaters 121 are connected together to the terminal box 123. Therefore, the cable between the terminal box 123 and the preheating power supply panel 142 can be a multi-core cable, which further reduces the number of cables.

[0035] In the case of the conventional equipment / piping room 120 with a nitrogen atmosphere, a metal-coated inorganic insulated cable (MI cable) for high temperature resistance was used as the cable. However, since the equipment / piping room 120 according to the present embodiment has an air atmosphere, a multi-core cable covered with a plastic material coating can be used. Examples of the plastic material include polyvinyl chloride mixture, polyethylene, polypropylene, fluororesin, polyamide, etc. Such a multi-core cable made of a plastic material is inexpensive and easy to handle, so that the preheating power supply system 20 can be configured at low cost.

[0036] The power supply room 140 is a room with an air atmosphere, and is provided with a power supply unit 141 for supplying power to the preheater 121. The power supply unit 141 supplies power to a preheating power supply panel 142 in the equipment / piping room 120.

[0037] In the pre-heating power supply system 20 according to the present embodiment, the cooling system piping 210 is double-piped and the cooling system equipment 213 is double-contained, so that the equipment / piping room 120, which was conventionally in a nitrogen atmosphere, is in an air atmosphere, and the maintenance and inspection of the equipment / piping room 120 can be easily performed. As a result, the pre-heating power supply panel 142, which was conventionally provided in the power supply room 140 located away from the reactor vessel room 100, can be provided in the equipment / piping room 120, and the cable length between the pre-heating power supply panel 142 and the terminal box 123 can be shortened while maintaining maintainability. It was found that the shortening of the cable length between the pre-heating power supply panel 142 and the pre-heater 121 can reduce the length of the power cable, which accounts for about 60% of the total cable of the pre-heating power supply system 20, to about 30% of the pre-heating power supply system 10.

[0038] Although an example has been described in which the multiple cables between the pre-heating power supply panel 142 and the terminal box 123 and the signal line connecting the pre-heating control panel 131 and the pre-heating power supply panel 142 are multi-core cables, the present invention is not limited to this. The signal line connecting the sensor connection panel 124 and the pre-heating control panel 131 may also be a multi-core cable covered with a plastic material coating.

[0039] The pre-heating power supply panel 142 according to this embodiment is provided in the equipment / piping room 120, and therefore is used in a higher temperature environment compared to a conventional configuration in which the pre-heating power supply panel 142 is provided in the power supply room 140. In this case, it is preferable to use a mechanical switch rather than a semiconductor switch as the electromagnetic contactor of the pre-heating power supply panel 142. This makes it possible for the equipment / piping room 120 to eliminate the need for air conditioning equipment dedicated to the pre-heating power supply panel 142 for adjusting the temperature of the pre-heating power supply panel 142.

[0040] <First Example of Electrical Connection Configuration from Power Supply Unit 141 to Preheater 121> 3 shows a first example of an electrical connection configuration from a power supply unit 141 to a preheater 121 according to this embodiment. The power supply unit 141 supplies a power supply voltage obtained by transforming a three-phase power supply of a power supply bus 201 to a preheating power supply panel 142. The power supply bus 201 is a power supply facility provided in a building constituting the fast reactor, and is, for example, a three-phase high-voltage bus rated at 6.6 kV. The power supply unit 141 includes a transformer 143 and a power center 144.

[0041] Transformer 143 is a three-phase three-wire (3φ3W) power transformer. Transformer 143 is, for example, a transformer with YY connection, Y-Δ connection, Δ-Δ connection, or the like. Fig. 3 shows an example in which transformer 143 is a Δ-Y connection transformer. The neutral point of the secondary side connection of transformer 143 is grounded, and as an example, the three-phase 6.6 kV voltage input to the primary side connection is transformed to three-phase 210 V.

[0042] The power center 144 is a facility that supplies the voltage stepped down by the transformer 143 to a pre-heating power supply panel 142 having a load within a predetermined range. Fig. 3 shows an example in which the power center 144 supplies a three-phase, three-wire, 210V power supply voltage to the pre-heating power supply panel 142.

[0043] The preheating power supply panel 142 supplies the received three-phase three-wire 210V power supply voltage as a single-phase 210V power supply voltage to each of the preheaters 121 via the terminal box 123. It is desirable that the preheating power supply panel 142 and the terminal box 123 are connected with a multi-core cable 230. For example, two voltage lines are connected to both ends of one preheater 121 via an electromagnetic contactor 220, and in response to a control signal supplied from the preheating control panel 131, the two voltage lines electrically connect one preheater 121 and the power supply unit 141 via the electromagnetic contactor 220 to supply the 210V power supply voltage to one preheater 121.

[0044] As described above, the power supply unit 141 in the first example of the connection configuration uses a general three-phase three-wire power transformer to supply power to the power load, but is not limited to this. The power supply unit 141 may have a configuration that supplies a higher power supply voltage to the preheater 121 using the same power supply bus 201. Such a configuration will be described next.

[0045] <Second Example of Electrical Connection Configuration from Power Supply Unit 141 to Preheater 121> 4 shows a second example of an electrical connection configuration from the power supply unit 141 to the preheater 121 according to this embodiment. The power supply unit 141 supplies a power supply voltage obtained by transforming the three-phase power supply of the power supply bus 201 to the preheating power supply panel 142. The power supply unit 141 includes a transformer 143 and a power center 144.

[0046] The transformer 143 transmits power through four wires, namely, three voltage wires and a neutral wire, from a three-phase three-wire power supply bus 201. In other words, the power supply unit 141 has a three-phase four-wire (3φ4W) 420V distribution line transformer 143 that transmits three-phase AC current using four distribution lines, namely, three voltage wires and one neutral wire. Here, the voltage between the neutral wire and each phase is a single-phase voltage of 240V. Then, the power center 144 supplies the voltage stepped down by the transformer 143 to the pre-heating power supply panel 142 having a load within a predetermined range.

[0047] One end of each of the preheaters 121 is commonly connected to the neutral line, and the other end is connected to a corresponding one of the three voltage lines. As a result, the preheater power supply panel 142 supplies the three-phase, four-wire, 420V power supply voltage to each of the preheaters 121 as a single-phase, 240V power supply voltage.

[0048] For example, one neutral wire and one voltage wire are connected to both ends of one preheater 121 via an electromagnetic contactor 220, and in response to a control signal supplied from a preheating control panel 131, one neutral wire and one voltage wire electrically connect one preheater 121 and a power supply unit 141 via the electromagnetic contactor 220 to supply a power supply voltage of 240 V to one preheater 121.

[0049] As described above, the three-phase four-wire power supply unit 141 shown in Fig. 4 can increase the three-phase line voltage compared to the three-phase three-wire power supply unit 141 shown in Fig. 3. This allows the three-phase phase current to be smaller than in the past, and the cross-sectional area of ​​the cable between the preheating power supply panel 142 and the preheater 121 to be smaller.

[0050] For example, in the case of the example of FIG. 4, the cross-sectional area of ​​the cable between the preheating power supply panel 142 and the preheater 121 is reduced to 1 / 3 compared to the example of FIG. 1 / 2 From 4 / (3×3 1 / 2 ) Therefore, by using a three-phase, four-wire power supply unit 141, the preheating power supply system 20 can reduce the amount of cable from the power supply unit 141 to the preheater 121. In addition, since the cross-sectional area of ​​the cable can be reduced and the current flowing through the cable can be reduced, more cables can be bundled together into one multi-core cable 230.

[0051] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, all or part of the device can be configured by distributing or integrating functionally or physically in any unit. In addition, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment resulting from the combination combines the effect of the original embodiment. [Explanation of symbols]

[0052] 10 Preheating power supply system 20 Preheating power supply system 100 Reactor vessel room 101 Reactor vessel 110 Cooling system piping 120 Equipment / Piping Room 121 Preheater 122 Temperature Sensor 123 Terminal box 124 Sensor connection board 125 Cooling system equipment 130 Control Panel Room 131 Preheating control panel 140 Power supply room 141 Power supply section 142 Preheating power supply panel 143 Transformer 144 Power Center 201 Power busbar 210 Cooling system piping 211 Inner tube 212 Outer tube 213 Cooling system equipment 214 Internal equipment 215 External cylinder container 220 Magnetic contactor 230 Multi-core cable

Claims

1. A preheating power supply system for a fast reactor that uses liquid metal to cool a reactor core, comprising: a cooling system piping connected to a reactor vessel room having a nitrogen atmosphere in which a reactor vessel containing the reactor core is provided; an equipment / piping room having an air atmosphere adjacent to the reactor vessel room, the equipment / piping room including a plurality of preheaters for preheating the cooling system piping and cooling system equipment for circulating the liquid metal; a power supply chamber in which a power supply unit for supplying power to the preheater is provided; Equipped with the cooling system piping is a double pipe including an inner pipe connected to the reactor vessel and for transporting the liquid metal to circulate the liquid metal among the reactor vessel, the cooling system piping, and the cooling system equipment, and an outer pipe provided so as to surround the periphery of the inner pipe, the cooling system device has a double container structure including an internal device containing the liquid metal and an external container provided to cover the internal device, The equipment and piping room is The cooling system piping is divided into a plurality of blocks, The preheater is disposed in the cooling system piping for each divided block, a preheating power supply panel that switches whether or not the power supplied from the power supply unit is supplied to the plurality of preheaters for each block; Preheating power system.

2. the equipment / piping room is arranged for each divided block of the cooling system piping, and further includes a plurality of temperature sensors for detecting temperatures of the cooling system piping; a preheating control panel that determines whether or not to supply power to the preheater of one block based on a temperature detection result of the temperature sensor of the one block, and supplies a control signal based on the determination result to the preheating power panel; The preheat power supply system of claim 1 .

3. A preheating power supply system for a fast reactor that uses liquid metal to cool a reactor core, comprising: a cooling system piping connected to a reactor vessel room having a nitrogen atmosphere in which a reactor vessel containing the reactor core is provided; an equipment / piping room having an air atmosphere, the equipment / piping room having a plurality of preheaters for preheating the cooling system piping and a cooling system device for circulating the liquid metal; a power supply chamber in which a power supply unit for supplying power to the preheater is provided; Equipped with the cooling system piping is a double pipe including an inner pipe for transporting the liquid metal and an outer pipe provided so as to surround the periphery of the inner pipe, the cooling system device has a double container structure including an internal device containing the liquid metal and an external container provided to cover the internal device, The equipment and piping room is The cooling system piping is divided into a plurality of blocks, The preheater is disposed in the cooling system piping for each divided block, a preheating power supply panel that switches whether or not the power supplied from the power supply unit is supplied to the plurality of preheaters for each block; a plurality of temperature sensors arranged in each divided block of the cooling system piping for detecting a temperature of the cooling system piping; Further comprising: a preheating control panel that determines whether or not to supply power to the preheater of one block based on a temperature detection result of the temperature sensor of the one block, and supplies a control signal based on the determination result to the preheating power panel; The signal line transmitting the control signal from the preheating control panel to the preheating power supply panel is a multi-core cable covered with a plastic material coating. Preheating power system.

4. A preheating power supply system for a fast reactor that uses liquid metal to cool a reactor core, comprising: a cooling system piping connected to a reactor vessel room having a nitrogen atmosphere in which a reactor vessel containing the reactor core is provided; an equipment / piping room having an air atmosphere, the equipment / piping room having a plurality of preheaters for preheating the cooling system piping and a cooling system device for circulating the liquid metal; a power supply chamber in which a power supply unit for supplying power to the preheater is provided; Equipped with the cooling system piping is a double pipe including an inner pipe for transporting the liquid metal and an outer pipe provided so as to surround the periphery of the inner pipe, the cooling system device has a double container structure including an internal device containing the liquid metal and an external container provided to cover the internal device, The equipment and piping room is The cooling system piping is divided into a plurality of blocks, The preheater is disposed in the cooling system piping for each divided block, a preheating power supply panel that switches whether or not the power supplied from the power supply unit is supplied to the preheaters for each block, the equipment / piping room is provided with a plurality of the preheaters and the preheating power supply panel, and further includes a terminal box electrically connected to cables of the plurality of the preheaters and the preheating power supply panel, The cable between the terminal box and the preheating power supply panel is a multi-core cable covered with a plastic material sheath. Preheating power system.

5. A preheating power supply system for a fast reactor that uses liquid metal to cool a reactor core, comprising: a cooling system piping connected to a reactor vessel room having a nitrogen atmosphere in which a reactor vessel containing the reactor core is provided; an equipment / piping room having an air atmosphere, the equipment / piping room having a plurality of preheaters for preheating the cooling system piping and a cooling system device for circulating the liquid metal; a power supply chamber in which a power supply unit for supplying power to the preheater is provided; Equipped with the cooling system piping is a double pipe including an inner pipe for transporting the liquid metal and an outer pipe provided so as to surround the periphery of the inner pipe, the cooling system device has a double container structure including an internal device containing the liquid metal and an external container provided to cover the internal device, The equipment and piping room is The cooling system piping is divided into a plurality of blocks, The preheater is disposed in the cooling system piping for each divided block, a preheating power supply panel that switches whether or not the power supplied from the power supply unit is supplied to the preheaters for each block, the power supply unit has a three-phase, four-wire distribution line that transmits three-phase AC current using four distribution lines, including three voltage lines and one neutral line; One end of each of the preheaters is commonly connected to the neutral line, and the other end is connected to a corresponding one of the three voltage lines. Preheating power system.

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