JP5661956B1 - Water shielding system around the reactor facility - Google Patents

Abstract

The present invention provides a water shielding system that can block inflow of groundwater toward a nuclear reactor facility and can be practically used. A water shielding system around a nuclear reactor facility that stops the distribution of groundwater to the nuclear reactor facility, and is a heat pipe embedded in the ground around the nuclear reactor facility with its upper end protruding to the surface side 10, the gas turbine generators 24 and 25, the tank 17 for storing the liquefied gas supplied as fuel to the gas turbine generators 24 and 25, and the heat pipe 10 is cooled by the heat of vaporization of the liquefied gas. A cooling jacket 13 that supplies and holds a liquefied gas at the upper end of the heat pipe 10 and a water-impervious wall 6 that is formed by frozen soil in which the ground is frozen by the liquefied gas via the heat pipe 10 are provided. [Selection] Figure 2

Description

  The present invention relates to a water shielding system for stopping the flow of ground water to nuclear facilities such as a nuclear reactor and a nuclear fuel storage.

  If an accident occurs at this type of nuclear reactor facility and radiation leaks, the groundwater that flows around the nuclear reactor facility is contaminated, and the contaminated water diffuses radioactivity or flows into the sea to contaminate seawater. There is danger. Such an accident occurred at TEPCO's Fukushima Daiichi NPS in Fukushima Prefecture, and the groundwater flowing around it is a problem. In view of this, it has been studied to construct a impermeable wall by freezing the ground around the power plant so that groundwater does not flow toward the reactor facility. However, there have been no examples of building impermeable walls with frozen soil in the past, and no system or method for this purpose is known.

  On the other hand, it is conventionally known to form a storage with frozen soil, and examples thereof are described in Patent Document 1 and Patent Document 2. The storages described in these documents create a storage room by digging or embedding the ground, burying the lower end of the heat pipe in the surrounding ground or in the embankment, and the upper end of the heat pipe It is exposed to the outside air, and the ground is frozen by cold air to form a low temperature storage.

Japanese Patent Laid-Open No. 01-300196 (second page, FIG. 1) Japanese Patent Laid-Open No. 03-274363 (second page, FIG. 1)

  The frozen soil walls described in Patent Documents 1 and 2 above are so-called cold storage units for maintaining a low-temperature state inside the storage. Therefore, there is no function as a “wall”, and there is no water shielding function. This is clear from the fact that the storages described in Patent Documents 1 and 2 have their own walls and roof.

  On the other hand, a frozen earth wall that shields water from the nuclear reactor facility does not need a cooling function of the nuclear reactor facility, and requires completely different characteristics from the frozen soil of the above-mentioned storage. For example, a cold storage function is not required, Regardless of the temperature of the outside air, it is always required to freeze firmly and perform a water shielding function without a gap. That is, as described in Patent Document 1 and Patent Document 2 described above, it is impossible to achieve a water-blocking function by transporting cold air from the outside air to the ground and storing it. Thus, even though the frozen soil for cold storage is known in the past, the technology relating to the use of frozen soil for water shielding was a completely new technology and had to be newly developed .

  The present invention has been made under the above technical background, and an object thereof is to provide a water shielding system around a nuclear reactor facility that can be sufficiently put into practical use.

  In order to achieve the above object, the system of the present invention is a water shielding system around a nuclear reactor facility that stops the flow of groundwater toward the nuclear reactor facility, and the upper end of the ground around the nuclear reactor facility is on the surface side. A heat pipe embedded in a projecting manner, a gas turbine generator, a tank for storing liquefied gas supplied as fuel to the gas turbine generator, and cooling the heat pipe by heat of vaporization of the liquefied gas A cooling heat transmission mechanism for transmitting the cooling heat of the liquefied gas to the upper end of the heat pipe, and a water-impervious wall formed by frozen soil in which the ground is frozen by the cooling heat of the liquefied gas via the heat pipe It is characterized by having.

  With such a configuration, the ground around the nuclear reactor facility is frozen by so-called cold heat generated by gas turbine power generation to form a water-impervious wall made of frozen soil, thereby blocking groundwater.

  In the present invention, the fuel tank further includes a gas tank that stores the fuel gas generated by vaporizing the liquefied gas, and the cooling heat transmission mechanism includes a cooling jacket that holds the liquefied gas at an upper end portion of the heat pipe, and the cooling jacket. The gas supply line for supplying the liquefied gas to the gas tank and the gas line for sending the fuel gas in the vapor phase generated in the cooling jacket to the gas tank can be provided.

  With such a configuration, the heat pipe can be directly cooled by the cooling heat of the liquefied gas.

  According to the present invention, the cooling heat transmission mechanism holds the heat exchanger that transmits the cooling heat of the liquefied gas to the refrigerant, and the refrigerant whose temperature is lowered by the heat exchanger at the upper end portion of the heat pipe. A cooling jacket that circulates the refrigerant between the heat exchanger and the cooling jacket.

  With such a configuration, combustible liquefied gas or fuel gas generated by vaporization can be kept away from the reactor facility.

  In this invention, the said water-impervious wall may be formed in the depth which reaches the impermeable layer in the said ground.

  With such a configuration, it is possible to prevent the underground water from flowing around to the lower side of the impermeable wall, and reliably prevent the inflow of the underground water to the reactor facility.

  Furthermore, this invention can comprise the water supply pipe which supplies the water for adjusting the moisture content of the said ground buried in the circumference | surroundings of the said heat pipe.

  With such a configuration, the moisture content of the ground to be frozen can be adjusted over the entire portion to be frozen, and therefore the ground can be frozen without excess or deficiency to form a strong and gap-free impermeable wall.

  Further, the present invention may further include a steel plate driven into the ground, and the heat pipe may be embedded while being in contact with the steel plate.

  With such a configuration, the steel plate becomes a part of the impermeable wall, the strength of the impermeable wall is improved, and the heat pipe can be reinforced with the steel plate, and the steel plate also functions as a heat conducting member. Therefore, the range that can be frozen with one heat pipe can be expanded, and accordingly, the required number of heat pipes can be reduced.

  According to the present invention, so-called exhaust heat or surplus cooling heat generated during gas turbine power generation is effectively used, so that a water shielding system that can be practically used without any running cost is obtained.

It is a schematic diagram for demonstrating the positional relationship of a nuclear reactor facility and a water-impervious wall. It is a distribution diagram showing typically the composition of the impermeable system concerning this invention. It is a partial schematic diagram for demonstrating the example which provided the water supply pipe | tube. It is a partial top view which shows typically the state which has arrange | positioned the heat pipe along the steel plate. It is a partial schematic diagram for demonstrating the example which connected the gas vent pipe to the cooling jacket. It is a schematic diagram which shows the other example of the water shielding system which concerns on this invention. It is explanatory drawing which shows the piping example comprised so that LNG or a refrigerant | coolant could be supplied separately to each heat pipe or the heat pipe of each county.

  Embodiments of the water shielding system according to the present invention will be described below. The basic structure of the water shielding system according to the present invention is schematically shown in FIGS. FIG. 1 shows a reactor building 2 containing a nuclear reactor vessel 1 as a nuclear reactor facility and a power building 4 containing a steam turbine generator 3, which are installed near a coast 5. Has been. The impermeable wall 6 made of frozen soil is formed in the surrounding ground so as to surround these facilities. The impermeable wall 6 is obtained by freezing soil together with moisture contained therein, and is vertically formed in a range from the ground surface 7 to an impermeable layer (or rock) 8 having an appropriate depth. ing. Therefore, the impermeable wall 6 is formed across the circulation layer of the groundwater 9 up and down to block the groundwater layer. Therefore, the groundwater 9 outside the impermeable wall 6 is blocked so as not to flow toward the reactor facility.

  The impermeable wall 6 must be kept frozen at all times, and liquefied gas (LNG) is used as a so-called cold heat source for cooling. A large number of heat pipes (or thermosiphons) 10 are embedded in the impermeable wall 6 in order to cool the ground by the cold heat. The interval between these heat pipes 10 is set based on the range in which the soil can be frozen by each heat pipe 10. The heat pipe 10 is a heat transfer element as conventionally known, and a working fluid such as ammonia water having a predetermined concentration is sealed inside a degassed pipe (container), and a heat input unit (heating unit) from the outside is enclosed. ) Is condensed in a heat radiating part (cooling part) that dissipates heat to the outside, thereby transporting heat in the form of latent heat. The return of the working fluid to the evaporation unit may be performed by the capillary force of the wick provided inside the pipe, or may be performed by gravity.

  These heat pipes 10 may be embedded directly in the ground around the nuclear reactor facility, or may be embedded in modified soil so as to be frozen and become frozen soil. An example of the modified soil is soil mainly composed of sand. For example, a hole or a groove reaching the above-described impermeable layer 8 is excavated in a place where the impermeable wall 6 is formed, and the hole or groove is formed in the hole or groove. Sand is thrown in, and water is poured into the soil so as to have a predetermined moisture content, if necessary, to make a modified soil, and the heat pipe 10 is embedded therein. In that case, it is preferable to form a film that suppresses the penetration of water, such as a nonwoven fabric or felt, on the inner surface of the hole or groove into which sand is introduced.

  For example, as shown in FIG. 3, water may be supplied to the sand by inserting a water supply pipe 11 together with the heat pipe 10 into the ground. The water supply pipe 11 may be a steel pipe having a large number of through holes at predetermined intervals, and water is permeated into the ground by supplying water to the inside as the freezing progresses.

  Moreover, as shown in FIG. 4, you may embed the heat pipe 10 in the state along the steel plates 12, such as a steel sheet pile. The steel plate 12 is placed along the inner wall of a groove that has been driven or excavated into the ground to partition the impermeable wall 6 from the surrounding ground. The heat pipe 10 is disposed along the steel plate 12 thus installed. With such a configuration, since the heat pipe 10 is reinforced by the steel plate 12, damage or deformation of the heat pipe 10 due to earth pressure or the like can be suppressed. In addition to this, since the steel plate 12 functions as a heat conducting member, the range in which the soil can be frozen with one heat pipe 10 can be widened, and consequently the number of heat pipes 10 required can be reduced. It becomes possible.

  Furthermore, the impermeable wall 6 freezes when it freezes. Therefore, it is preferable that the surface height of the portion where the water-impervious wall 6 is formed be lowered in advance in consideration of the rise due to freezing. In addition, since a tensile force may act on the heat pipe 10 as the frost freezes, the heat pipe 10 is preferably configured to be able to extend as the frost freezes. An example thereof is a heat pipe in which a pipe (container) is constituted by a corrugated pipe. Another example is a heat pipe bent in a spiral. Even if it is any of these structures, since it extends in the up-and-down direction with the freezing of the ground in the embedded state, it is possible to avoid breakage and cracks due to pulling.

  The cooling heat transmission mechanism that sends the cooling heat of the LNG to the heat pipe 10 will be described. The upper end portion of the heat pipe 10 extends to the ground surface side, and the cooling jacket 13 is provided at the upper end portion of each heat pipe 10. ing. This cooling jacket 13 is for making LNG which is a cold heat source contact the upper end part of each heat pipe 10, and is comprised as an airtight container which covers the upper end part of each heat pipe 10 in an airtight state. . Note that the cooling jacket 13 may be configured to collectively cover the upper ends of the plurality of heat pipes 10. Adjacent cooling jackets 13 are connected by a communication pipe 14 corresponding to the liquid supply line in the present invention. A predetermined number of groups of cooling jackets 13 are connected in series, and each group is parallel to each other. It is communicated to become a relationship.

  The LNG is partially vaporized by taking heat from the heat pipe 10 inside the cooling jacket 13. In order to prevent the gas from entering the LNG and increasing the pressure, it is preferable that the gas generated by vaporization is separated from the LNG flowing through the cooling jacket 13. FIG. 5 shows an example thereof, and a gas vent pipe 15 is connected to the upper end of each cooling jacket 13, and the gas vent pipe 15 communicates with a collecting pipe 16 corresponding to the gas pipe line in the present invention. The collecting pipe 16 communicates with a gas tank described later.

  LNG is accommodated in the liquid tank 17 and is, for example, about −160 ° C. A pump 18 is connected to the liquid tank 17, and LNG is taken out at a predetermined flow rate by the pump 18. A three-way switching valve 19 is connected to the discharge side of the pump 18, and the three-way switching valve 19 switches between the cooling jacket 13 side and the bypass pipe 20 side to supply LNG. The bypass pipe 20 is for supplying LNG to the vaporizer 21 without going through the cooling jacket 13. Therefore, a part of the LNG to be gasified is supplied to the cooling jacket 13, and in this sense, the ground is frozen by using a part of the heat of vaporization of the LNG to form the impermeable wall 6. Is configured to do.

  The LNG that has passed through the cooling jacket 13 is joined to the LNG flowing through the bypass pipe 20 and supplied to the vaporizer 21. The vaporizer 21 is a heat exchanger for applying heat to the LNG to vaporize it, and is configured to heat the LNG with seawater pumped by the pump 22. Natural gas (fuel gas) generated by vaporization is sent to the gas tank 23 and stored. This natural gas is an energy source for gas turbine generators. That is, the gas turbine generator is configured to generate electricity by rotating the generator 25 by the gas turbine engine 24, and the gas turbine engine burns natural gas in the combustion chamber 26 as is conventionally known. A high-temperature / high-pressure gas is generated, the high-temperature / high-pressure gas is sent to the turbine 27, the turbine 27 is rotated, and the generator 25 and the compressor 28 are rotated by the power generated in the turbine 27. . The compressor 28 is configured to suck in and compress outside air and supply the compressed air to the combustion chamber 26. Therefore, the above-described water shielding system according to the present invention is configured to form a water shielding wall using the heat of vaporization (evaporation heat) of LNG generated during gas power generation.

  The water shielding around the nuclear reactor facility according to the present invention is performed by constructing the water shielding wall 6 described above. In the method, first, a large number of heat pipes 10 are embedded in a place where the inflow to groundwater should be stopped around the reactor facility. In that case, the embedding method suitable for the soil of the embedding location of the heat pipe 10 is adopted, such as modifying the ground with sand, adjusting the moisture content thereof, or using the steel plate 12 together. The upper end portion of the heat pipe 10 is projected to the ground surface side, the above-described cooling jacket 13 is attached to the upper end portion, and LNG which is an energy source for power generation is supplied to the cooling jacket 13. Since LNG is a low temperature of about −160 ° C., the upper end of the heat pipe 10 is cooled, and the embedded lower end is at the outside air temperature or an underground temperature higher than that. The unit operates as a heating unit and the upper end as a cooling unit. That is, after the working fluid evaporated at the lower end flows to the upper end, the heat is dissipated and condensed, so that the underground heat is carried to the upper end and cooled. As a result, the ground freezes to become frozen soil, and the water shielding wall 6 is formed.

  In this case, if the soil in which the heat pipe 10 is embedded is a modified soil mainly composed of sand, and water is supplied according to the progress of freezing using the water supply pipe 11 shown in FIG. It becomes easy to freeze the periphery of the heat pipe 10 uniformly without any spots. Moreover, if the heat pipe 10 is made to follow the steel plate 12, since the steel plate 12 functions as a heat-transfer member, the ground of a wide range can be frozen with one heat pipe 10. Furthermore, if the heat pipe 10 is a corrugated pipe as a container, or the heat pipe 10 is curved in a spiral shape, the heat pipe 10 can be prevented from being damaged because it extends in the vertical direction as the ground freezes. Or it can be suppressed.

  Since the impermeable wall 6 formed in this way is made of soil particles hardened with ice, the circulation of groundwater can be completely stopped. Further, since the impermeable wall 6 is formed to a depth that reaches the impermeable layer 8, the groundwater does not enter the lower side of the impermeable wall 6 and reach the inner side of the impermeable wall 6. As a result, groundwater does not reach the reactor facility, and groundwater contaminated with radioactivity is prevented from leaking around the reactor facility.

  After the ground is frozen and the impermeable wall 6 is once formed, the frozen state can be maintained by cooling the impermeable wall 6 with the same amount of heat transmitted to the impermeable wall 6 from the outside. Therefore, the amount of LNG to be supplied to the cooling jacket 13 may be smaller than the amount when forming the water shielding wall 6. Therefore, in that case, LNG is caused to flow to the bypass pipe 20 side by the three-way switching valve 19 described above. The LNG passing through the cooling jacket 13 or the LNG passing through the bypass pipe 20 is heated by seawater by the vaporizer 21 and is vaporized. The natural gas is temporarily stored in the gas tank 23 and then sent to the gas turbine generator for use in power generation. Therefore, according to the present invention, since the water shielding wall 6 is formed by using the heat of evaporation of LNG generated by the gas turbine power generation that is used regularly and discarded as a cold heat source, the cooling energy for water shielding is costly. It hardly takes, but rather, it is possible to effectively use energy.

  Since the heat pipe 10 described above is for removing heat from the ground and freezing the ground, the heat pipe 10 is preferably in direct contact with the surrounding soil as much as possible. Therefore, deterioration of the heat pipe 10 due to corrosion or earth pressure is inevitable. However, in the above-described water-impervious system, since the pipes for flowing LNG such as the cooling jacket 13 and the communication pipe 14 are arranged on the ground surface side, even if the underground heat pipe 10 is damaged, combustible gas is generated. There is no risk of leakage to the surrounding environment. Further, when the heat pipe 10 is damaged, the heat pipe 10 may be replaced, and construction such as gas pipe reconstruction is not required. Therefore, maintenance is facilitated and the cost can be reduced.

  Next, another specific example of the present invention will be described. This is an example of avoiding placing a large amount of flammable fuel on the site of a nuclear reactor facility or an area (area) within a predetermined range. In FIG. 6, reference numeral 30 indicates a predetermined region so as to avoid the arrangement of the combustible gas. On the other hand, the liquid tank 17, the pump 18, the vaporizer 21, the gas turbine power generation equipment such as the gas turbine engine 24, and the equipment using fuel gas such as the gas tank 23 are arranged outside the region 30. . A heat exchanger 33 is connected via a three-way valve 32 to a pipe line 31 that supplies LNG to the vaporizer 21 by the pump 18. The heat exchanger 33 is for cooling the refrigerant by exchanging heat between the LNG and the refrigerant, and a conventionally known heat exchanger can be adopted.

The heat exchanger 33 constitutes a part of the cooling heat transmission mechanism in the present invention. Between the heat exchanger 33 and the heat pipe 10, an aqueous solution of calcium chloride, an aqueous ethylene glycol solution, propylene glycol, alcohol, etc. A circulation line 34 for circulating the refrigerant is provided. The refrigerant is made of a material that can maintain a fluid state even when cooled to a low temperature sufficient to form the above-described frozen soil impermeable wall 6. The refrigerant is provided at the upper end of the heat pipe 10. The supply pipe 35 that supplies the cooling jacket 13 is connected to the heat exchanger 33 and the cooling jacket 13.
Between. As described above, the heat exchanger 33, which is a facility using LNG, is arranged outside the region 30 of the nuclear reactor facility, and the distance between the heat exchanger 33 and the heat pipe 10 is several hundred meters to several kilometers. The supply pipe 35 transports the refrigerant over the distance. Therefore, a sufficient coating for thermal insulation is applied.

  As described above, the cooling jackets 13 are connected to each other by the communication pipes 14 so that the refrigerant flows in order from the upstream cooling jacket 13 to the downstream cooling jacket 13. The cooling jacket 13 and the heat exchanger 33 which are the most downstream or the most downstream in the predetermined group are communicated with each other by a return pipe 36. A refrigerant tank 37 and a refrigerant pump 38 are provided in the middle of the return pipe 36. The other configuration in FIG. 6 is the same as the configuration shown in FIG. 2 described above, and therefore, the same reference numerals as those in FIG.

  In the configuration shown in FIG. 6, the cooling heat of the LNG is transmitted to the refrigerant by the heat exchanger 33, and the temperature of the refrigerant is lowered. The refrigerant is sent to the cooling jacket 13 of each heat pipe 10 via the supply pipe 35. Since this refrigerant replaces the LNG in the specific example shown in FIG. 2 described above, heat is taken away from the surrounding soil of the heat pipe 10 and freezes to become frozen soil, thereby forming the impermeable wall 6. In the configuration shown in FIG. 6, heat exchange between the LNG and the refrigerant is performed outside the region 30 of the reactor facility, and it is avoided that LNG enters or is placed inside the region 30 of the reactor facility. Is done.

  In the case of forming the impermeable wall 6 by freezing the ground, it is necessary to take sensible heat and perform cooling commensurate with the heat entering from the outside and the heat lost by the heat radiation. The cooling required to maintain 6 in a frozen state may be commensurate with the heat entering from the outside and the heat lost by heat dissipation. Therefore, if the entire ground in a predetermined range surrounding the nuclear reactor facility is frozen at once, a huge amount of cooling heat is required as compared with the case where the frozen state is maintained. The equipment that can obtain the enormous amount of cooling heat is not practical because it is much larger than the equipment that is required in the steady state to maintain the frozen state. Therefore, using a cooling facility with the capacity required in steady state to maintain the frozen state or a facility slightly larger than that, expand the frozen parts sequentially, and finally freeze the entire necessary parts to block the water. It is conceivable to form the wall 6.

  In that case, it is preferable that LNG or the above-mentioned refrigerant can be supplied for each heat pipe 10 or for each predetermined number of groups of heat pipes 10. An example thereof is schematically shown in FIG. 7, and a cooling jacket 13 in each heat pipe 10 or each group of heat pipes 10 is an on-off valve (flow rate adjusting valve). The cooling jacket 13 communicates with the return pipe 42 communicated with the vaporizer 21 or the gas tank 23 or the return pipe 42 that returns the refrigerant to the refrigerant tank 37. In such a configuration, the cooling jacket 13 of the heat pipe 10 that performs freezing is fully opened to supply a large amount of LNG or refrigerant to the cooling jacket 13 of the heat pipe 10 for maintaining the frozen state. The opening / closing valve 41 is throttled to supply the minimum amount of LNG or refrigerant, and the cooling jacket 13 of the heat pipe 10 that is not cooled is closed with no opening / closing valve 41 to supply LNG or refrigerant. Therefore, according to such a freezing method or a construction method of the impermeable wall 6, it is possible to reduce the amount of LNG or refrigerant required at one time. It can be as large as needed for normal operation of the machine.

  The example of the embodiment of the present invention has been described above, but the cold heat source may be LPG (liquefied petroleum gas) or an appropriate refrigerant instead of the above LNG.

  DESCRIPTION OF SYMBOLS 1 ... Nuclear reactor vessel, 2 ... Reactor building, 3 ... Steam turbine generator, 4 ... Power generation building, 5 ... Beach, 6 ... Impermeable wall, 7 ... Ground surface, 8 ... Impermeable layer (or bedrock), 9 ... Groundwater, 10 ... Heat pipe (or thermosiphon), 11 ... Water supply pipe, 12 ... Steel plate, 13 ... Cooling jacket, 14 ... Communication pipe, 15 ... Degassing pipe, 16 ... Collecting pipe, 17 ... Liquid tank, 18 ... Pump , 19 ... Three-way switching valve, 20 ... Pipe pipe, 21 ... Vaporizer, 22 ... Pump, 23 ... Gas tank, 24 ... Gas turbine engine, 25 ... Generator, 26 ... Combustion chamber, 27 ... Turbine, 28 ... Compressor, 30 ... area, 31 ... pipe, 32 ... three-way valve, 33 ... heat exchanger, 34 ... circulation pipe, 35 ... supply pipe, 36 ... return pipe, 37 ... refrigerant tank, 38 ... cold Pump, 40 ... liquid supply pipe, 41 ... on-off valve (flow control valve), 42 ... return pipe.

Claims (5)

In a water shielding system around the reactor facility that stops the distribution of groundwater to the reactor facility,
A heat pipe embedded in the ground around the nuclear reactor facility with its upper end projecting to the ground surface;
A gas turbine generator,
A tank for storing liquefied gas supplied as fuel to the gas turbine generator;
A cooling heat transmission mechanism that transmits the cooling heat of the liquefied gas to the upper end of the heat pipe so as to cool the heat pipe by the heat of vaporization of the liquefied gas;
A water shielding wall formed by frozen soil obtained by freezing the ground by cooling heat of the liquefied gas through the heat pipe ;
A gas tank for storing fuel gas generated by vaporizing the liquefied gas;
The cooling heat transmission mechanism includes a cooling jacket that holds the liquefied gas at an upper end portion of the heat pipe, a liquid supply line that supplies the liquefied gas to the cooling jacket, and a gas phase generated in the cooling jacket. A water shielding system around a nuclear reactor facility , comprising: a gas pipe for sending fuel gas to the gas tank . In a water shielding system around the reactor facility that stops the distribution of groundwater to the reactor facility,
A heat pipe embedded in the ground around the nuclear reactor facility with its upper end projecting to the ground surface;
A gas turbine generator,
A tank for storing liquefied gas supplied as fuel to the gas turbine generator;
A cooling heat transmission mechanism that transmits the cooling heat of the liquefied gas to the upper end of the heat pipe so as to cool the heat pipe by the heat of vaporization of the liquefied gas;
A water shielding wall formed by frozen soil obtained by freezing the ground by cooling heat of the liquefied gas through the heat pipe ;
The cooling heat transmission mechanism includes a heat exchanger that transmits cooling heat of the liquefied gas to a refrigerant, a cooling jacket that holds the refrigerant whose temperature is lowered by the heat exchanger at an upper end portion of the heat pipe, A water shielding system around a nuclear reactor facility , comprising: a circulation pipe for circulating the refrigerant between the heat exchanger and the cooling jacket . The impervious wall has water barrier system of reactor facilities around according to any one of claims 1 and 2, characterized in that it is formed to a depth reaching the impermeable layer in said ground. The water shielding around the nuclear reactor facility according to any one of claims 1 to 3 , wherein a water supply pipe for supplying water for adjusting the moisture content of the ground is buried around the heat pipe. system. Further comprising a steel plate driven into the ground,
The water shielding system around a nuclear reactor facility according to any one of claims 1 to 4 , wherein the heat pipe is buried in contact with the steel plate.

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