JP2012083131A - Liquid metal-cooled nuclear reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid metal-cooled nuclear reactor which prevents contact of leaked liquid metal with cooling air and surely and efficiently removes heat generated in the liquid metal-cooled nuclear reactor by a multiple and passive reactor vessel auxiliary cooling system which is newly constituted even though an accident like a hypothetical event occurs.SOLUTION: A liquid metal-cooled nuclear reactor 1 includes; a reactor vessel 4 in which liquid metal is filled; a containment vessel 6 for containing the reactor vessel 4; a silo 7 for storing the containment vessel 6 via an annular space 35; a collector 10 which partitions the annular space 35 and which comprises a cylindrical sleeve 21 forming an air downward flow channel 12 on the side of the silo 7 and an air upward flow channel 13 on the side of the containment vessel 6; multiple closing members 15 which are arranged on the bottom part 14 of the silo 7 and whose specific gravity is smaller than the liquid metal; and a plurality of heat pipes 20 whose each one end is arranged within the sleeve 21 of the collector 10 and whose each of the other end is arranged outside a building. A melting point of the sleeve 21 is lower than a temperature of leaked liquid metal.

Description

  The present invention relates to a liquid metal cooled nuclear reactor equipped with a reactor vessel auxiliary cooling system.

  As shown in FIG. 9, a liquid metal cooled nuclear reactor has a nuclear fuel core 2 disposed in a reactor vessel 4 filled with a liquid metal 3 such as sodium or sodium / potassium as a coolant. Is stored in a storage container 6 through a gap 5 filled with an inert gas, and the storage container 6 is housed in a concrete silo 7 formed by digging under the ground surface.

  In this liquid metal cooled nuclear reactor 1, it is necessary to stop the nuclear fission reaction in order to cope with an emergency situation during the operation of the nuclear reactor or to perform maintenance and inspection. However, since the residual decay heat continues to be generated from the core, it is necessary to remove the heat generated from the liquid metal cooled reactor 1.

  The heat of the reactor is transmitted from the reactor vessel 4 to the containment vessel 6 by heat radiation, the temperature of the containment vessel 6 rises, and the heat from the containment vessel 6 is radiated toward the outer concrete silo 7 and the like. A structure such as the silo 7 cannot withstand a high temperature for a long period of time. For example, the silo 7 made of concrete expands and may crack. In order to remove heat from the containment vessel 6, a reactor vessel auxiliary cooling system (RVACS) is provided in the annular space 35 between the containment vessel 6 and the silo 7.

  This reactor vessel auxiliary cooling system composed of a passive cooling system that does not use an active device such as a pump uses air, that is, the atmosphere, as a cooling medium for removing heat by natural convection, and the outside of the containment vessel 6. A cylindrical collector 10 is provided in an annular space between the storage container 6 and the silo 7 so as to form an air descending passage 12 and an air raising passage 13 in which air descends and rises.

  As a result, the air in the air ascending channel 13 is heated by the heat of the containment vessel, rises through the air ascending channel 13, and is discharged to the outside via the duct 17 from the air discharge port 18. In addition, air is taken into the air descending passage 12 of the air cooling passage from the air intake port 16, and the air taken into the air descending passage 12 flows downward through the air descending passage 12 and becomes a silo. 7 and then flows into the air rising flow path 13 between the collector 10 and the storage container 6, flows upward along the outer wall of the storage container 6, and is heated while being stored. The heat of the container is released to the outside (Patent Document 1).

Japanese Patent Laid-Open No. 6-174848

  In the conventional liquid metal cooled nuclear reactor described above, an extreme and unlikely virtual event, for example, both the reactor vessel and the containment vessel are damaged, and the hot liquid metal in the reactor vessel is moved further from the containment vessel into the silo. If a leaking event occurs, the air cooling flow path between the containment vessel and the silo will not function and the reactor vessel auxiliary cooling system will not operate.

  The present invention has been made to solve the above-mentioned problems, and even if a virtual event such as a double vessel leak occurs, it prevents contact between the leaked liquid metal and the cooling air and is generated in the liquid metal cooled reactor. It is an object of the present invention to provide a liquid metal cooled nuclear reactor equipped with a multiple and passive reactor auxiliary cooling system capable of reliably and efficiently removing heat.

  In order to solve the above problems, a liquid metal cooled nuclear reactor according to the present invention includes a nuclear reactor vessel filled with a liquid metal, a containment vessel for storing the nuclear reactor vessel, and the containment vessel in an annular space. In a liquid metal cooled nuclear reactor having a silo that is housed through and a collector comprising a cylindrical sleeve that divides the annular space and forms an air descending channel on the silo side and an air rising channel on the containment vessel side A plurality of closing members disposed at the bottom of the silo and having a specific gravity smaller than that of the liquid metal, and a plurality of heat pipes having one end disposed inside the collector sleeve and the other end disposed outdoors. The sleeve has a melting point lower than the temperature of the leaking liquid metal.

  A liquid metal cooled nuclear reactor according to the present invention includes a nuclear reactor vessel filled with liquid metal, a containment vessel for storing the nuclear reactor vessel, and a silo for accommodating the containment vessel via an annular space. A liquid metal cooled nuclear reactor having a cylindrical sleeve that divides the annular space and forms an air descending channel on the silo side and an air rising channel on the containment vessel side, at the bottom of the silo A plurality of closing members having a specific gravity smaller than that of the disposed liquid metal, and a plurality of heat pipes having one end disposed inside the sleeve of the collector and the other end disposed outside the building, the sleeve being the upper sleeve And a lower sleeve, and the upper sleeve and the lower sleeve are connected by a fastening member having a melting point lower than the temperature of the leaked liquid metal.

  A liquid metal cooled nuclear reactor according to the present invention includes a nuclear reactor vessel filled with liquid metal, a containment vessel for storing the nuclear reactor vessel, and a silo for accommodating the containment vessel via an annular space. A liquid metal cooled nuclear reactor having a cylindrical sleeve that divides the annular space and forms an air descending channel on the silo side and an air rising channel on the containment vessel side, at the bottom of the silo A plurality of closing members having a specific gravity smaller than that of the arranged liquid metal, and a plurality of heat pipes having one end arranged inside the sleeve of the collector and the other end arranged outside the building, and connecting the sleeve to the connecting portion Is composed of an upper sleeve and a lower sleeve made of bimetal or shape memory alloy, and the connection between the upper collector and the lower collector is released by deformation due to the temperature of the leaked liquid metal. And butterflies.

  According to the present invention, even if an accident such as a virtual event occurs, the newly configured multiple and passive reactor vessel auxiliary cooling system prevents contact between the leaked liquid metal and the cooling air, Heat generated in the liquid metal cooled nuclear reactor can be reliably and efficiently removed.

(A) is the whole block diagram of the liquid metal cooling reactor which concerns on 1st Embodiment, (b) is an enlarged view of a collector. FIG. 2 is a plan view of a liquid metal cooled nuclear reactor as viewed from line AA in FIG. 1. (A) is a whole block diagram of a liquid metal cooling reactor when a virtual accident occurs in the first embodiment, and (b) is an enlarged view of a collector. (A) is the whole block diagram of the liquid metal cooling reactor which concerns on 2nd Embodiment, (b) is an enlarged view of a collector. (A) is a whole block diagram of a liquid metal cooling reactor when a virtual accident occurs in the second embodiment, and (b) is an enlarged view of a collector. (A) is the whole block diagram of the liquid metal cooling reactor which concerns on 3rd Embodiment, (b) is an enlarged view of a collector. (A) is a whole block diagram of the liquid metal cooling reactor which concerns on 4th Embodiment, (b) is an enlarged view of a collector. (A) is a whole block diagram of a liquid metal cooling reactor when a virtual accident occurs in the fourth embodiment, and (b) is an enlarged view of a collector. The whole block diagram of the conventional liquid metal cooling reactor.

Hereinafter, embodiments of a liquid metal cooled nuclear reactor according to the present invention will be described with reference to the drawings.
[First Embodiment]
A liquid metal cooled nuclear reactor according to a first embodiment of the present invention will be described with reference to FIGS.

(Constitution)
As shown in FIG. 1A, the liquid metal cooled nuclear reactor 1 according to the first embodiment includes a nuclear fuel core 2 and a coolant composed of a liquid metal 3 such as sodium or sodium / potassium at a liquid level Ln. A reactor vessel 4 filled up to a point, a containment vessel 6 for storing the reactor vessel 4 through a gap 5 filled with an inert gas, and the containment vessel 6 is accommodated via an annular space 35 and dug down below the ground surface. The reactor vessel 4 and the containment vessel 6 are supported by the stepped portion of the silo 7. Further, the storage dome 8 is arranged so as to cover the upper part of the reactor vessel 4 and the containment vessel 6 accommodated in the reactor upper chamber 9.

  The upper part of the annular space 35 between the outer wall of the storage container 6 and the inner wall of the silo 7 is fixed to the silo 7, and the annular space 35 is divided into two parts, the storage container 6 side and the silo 7 side. The collector 10 is provided. As a result, an air descending channel (outer channel) 12 is formed on the silo 7 side, and an air ascending channel (inner channel) 13 is formed on the storage container 6 side. Each flow path 13 is open at the bottom 14 of the silo 7 and communicates with each other. The air descending flow path 12 is connected to an air intake port 16 for taking in external cooling air, and the air ascending flow path 13 is connected to a duct 17 and is further cooled to the outside through the duct 17. An air discharge port 18 for discharging the air is connected.

  As shown in FIG. 1B, the collector 10 is composed of an annular sleeve 21 having a gap formed therein, and a plurality of heat pipes 20 arranged circumferentially at intervals in the gap in the sleeve 21. Is done. The cooling part at the lower end of the heat pipe 20 extends to the lower part of the sleeve 21, and the cooling part at the upper end is provided to be exposed outside the building as shown in FIGS. 1 (a) and 2.

  The heating part at the lower end of the heat pipe 20 is used for the liquid metal 3 in the reactor vessel 4 and the containment vessel as shown in FIG. 6. It is provided so as to be located below the liquid level Lc when it accumulates in the silo 7 up to the liquid level position Lc at the time of leakage.

The heat pipe 20 is filled with a working fluid that operates at the temperature of the leaked liquid metal 3a. Examples of such a working fluid include Dowsome A ((C ₆ H ₅ ) ₂ + (C ₆ H ₅ ) ₂ O) and naphthalene C ₁₀ H ₈ having an operating temperature of 150 ° C. to 400 ° C.

  The sleeve 21 is made of a material having a melting point lower than the temperature of the leaking liquid metal 3a (for example, an alloy mainly composed of zinc, indium, tin, bismuth, lead, etc.). In an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6, which is an extremely unlikely virtual event, occurs, the sleeve 21 is immersed in the leaked liquid metal 3a and becomes hot and melts, and the heat pipe 20 The heating part at the lower end of is exposed and immersed in the leaked liquid metal 3a.

  Moreover, the bottom part 14 of the silo 7 is smaller than the flow path shape of the air descending flow path 12 and the air rising flow path 13 as a passive closing means that does not depend on external driving or external operation, and gas is sealed inside. Further, a closing member 15 made up of a number of hollow containers is disposed. The closing member 15 filled with the gas has a specific gravity smaller than that of the liquid metal 3 and is formed so as to float on the liquid level Lc of the leaking liquid metal 3a. Is arranged. The closing member 15 is formed of a heat-resistant and liquid-resistant metal material, and the shape of the closing member 15 is the same shape that makes close contact with the other closing member 15 without creating a gap when the liquid surface Lc is floated so as to be filled up. Alternatively, large and small irregularly shaped spheres, substantially spherical bodies or polyhedrons, and solid surfaces with irregular surfaces.

  In the present embodiment, a hollow container filled with gas is used as the closing member 15, but the present invention is not limited to this, and is a solid heat-resistant liquid metal-resistant metal having a specific gravity that can float on the liquid surface of the liquid metal 3. The closing member 15 may be made of a material.

(Function)
In the liquid metal cooled nuclear reactor configured as described above, during normal times, the reactor vessel 4 is filled with the liquid metal 3 so as to reach a predetermined normal liquid level position Ln (FIG. 1 (a)), and nuclear fuel. The heat generated by nuclear fission in the core 2 is taken out by circulating the liquid metal 3 and used for power generation or the like.

Then, the air descending flow path 12 takes in the cooling air from the air intake port 16, flows downward through the air descending flow path 12, reverses the air flow direction at the bottom 14 of the silo 7, and then rises in air. The containment vessel is cooled by circulating the flow path 13 upward, and the cooled air is discharged from the air discharge port 18 to the outside through the duct 17.
The flow of cooling air is due to natural convection in which air is heated on the outer wall surface of the containment vessel 6 and flows upward in the air ascending flow path 13.

  Next, in an emergency where a liquid metal leak from the reactor vessel 4 and the containment vessel 6, which is a virtual event that is unlikely to occur at an extreme, the reactor vessel 4 was filled up to the normal liquid level position Ln. As shown in FIG. 3 (a), the liquid metal 3 drops to the leakage level Lc lower than normal and accumulates in the reactor vessel 4, the containment vessel 6, and the annular space 35, and the collector 10 becomes liquid metal. Immerse. At this time, the sleeve 21 is heated and melted by the heat of the leaking liquid metal 3a, and the lower end portion of the heat pipe 20 is exposed to contact the leaking liquid metal 3a (FIG. 3B).

  Thereby, the heating part at the lower end of the heat pipe 20 immersed in the leaking liquid metal 3a absorbs the heat of the leaking liquid metal 3a, and is newly passively dissipated by the cooling part at the upper end of the heat pipe 20 outside the building. A reactor vessel auxiliary cooling system is configured.

  Further, a large number of closing members 15 arranged in the bottom part 14 of the silo 7 float so as to be buried in close contact with the liquid level of the accumulated leaked liquid metal 3a, and the air descends as the liquid level rises. It enters the flow path 12 and the air rising flow path 13. Then, when the liquid level of the leaked liquid metal 3 reaches the liquid level position Lc at the time of leakage and the liquid level rise stops, a large number of closed portions are respectively formed on the stopped liquid levels in the air descending flow path 12 and the air rising flow path 13. The liquid surface is filled up and floated so that the member 15 is in close contact, and contact between the leaked liquid metal 3a and the air is prevented.

  This prevents a fire of sodium or the like due to air contact and prevents generation of radioactive reaction products caused by contact between air and the leaked liquid metal 3a, thereby preventing direct leakage into the atmosphere.

  In this way, in the event of an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6 is a virtual event that is unlikely to occur at an extreme, the closing member prevents contact between the leaked liquid metal 3a and the air. A new air cooling path is configured, and a new heat dissipation path is configured by the exposed heat pipe, which makes it possible to construct a passive and multiplexed new reactor vessel auxiliary cooling system, It is possible to reliably and efficiently remove the residual decay heat that continues to be generated from the core after the stop operation.

  As described above, according to the first embodiment, even if an accident such as a virtual event occurs, the newly configured multiple and passive reactor vessel auxiliary cooling system allows the leaked liquid metal And the heat generated in the liquid metal cooling reactor can be reliably and efficiently removed.

[Second Embodiment]
A liquid metal cooled nuclear reactor according to a second embodiment of the present invention will be described with reference to FIGS.
(Constitution)
In the second embodiment, as shown in FIGS. 4 (a) and 4 (b), the cylindrical collector 10 has a sleeve 21 that is divided into an upper sleeve 21a and a lower sleeve 21b in the vertical direction. Is connected and fixed by a fastening member 30 such as a bolt.

  The fastening member 30 is made of a material having a melting point lower than that of the liquid metal (for example, an alloy mainly composed of zinc, indium, tin, bismuth, lead, etc.). In the event of an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6, which is an extremely unlikely virtual event, the fastening member 30 is immersed in the leaking liquid metal 3a and the fastening member is heated by the heat of the leaking liquid metal 3a. 30 melts. As a result, the lower sleeve 21b falls to the bottom 14, and the heating part at the lower end of the heat pipe 20 is exposed and directly contacts the leaked liquid metal 3a (FIGS. 5A and 5B).

(Function)
In the liquid metal cooled nuclear reactor configured as described above, in the event of an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6, which is an extremely unlikely virtual event, occurs, the liquid metal 3 The fastening member 30 is melted by the heat of the leaking liquid metal, the lower sleeve 21b falls, and the upper sleeve 21a remains, as shown in FIG. 5 (b). The heating part at the lower end of 20 is exposed and immersed in the leaked liquid metal 3a.

Thereby, the heating part at the lower end of the heat pipe 20 immersed in the leaking liquid metal 3a absorbs the heat of the leaking liquid metal 3a, and is newly passively dissipated by the cooling part at the upper end of the heat pipe 20 outside the building. A reactor vessel auxiliary cooling system is configured.
In addition, the effect | action and function of many closing members 15 arrange | positioned in the bottom part 14 of the silo 7 are the same as that of the said 1st Embodiment.

  According to the second embodiment, in the event of an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6 is a virtual event that is unlikely to occur in an extreme, the leakage liquid metal 3a and the air In addition, a new air cooling path is formed, and a new heat dissipation path is formed by a heat pipe exposed by the lower sleeve falling, thereby forming a new passive and multiplexed atom. It becomes possible to construct a reactor vessel auxiliary cooling system, and it is possible to reliably and efficiently remove the residual decay heat that continues to be generated from the core after the stop operation.

[Third Embodiment]
A liquid metal cooled nuclear reactor according to a third embodiment of the present invention will be described with reference to FIG.
(Constitution)
In the third embodiment, as shown in FIG. 6B, the cylindrical collector 10 includes a sleeve 21 that is divided into an upper sleeve 21a and a lower sleeve 21b in the vertical direction. The fastening member 30 is connected and fixed.

  The difference from the second embodiment is that not only the fastening member 30 but also the lower sleeve 21b has a material whose melting point is lower than the temperature of the liquid metal (for example, an alloy mainly composed of zinc, indium, tin, bismuth, lead, etc.). It consists of

(Function)
In the liquid metal cooled nuclear reactor configured as described above, in the event of an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6, which is an extremely unlikely virtual event, occurs, the liquid metal 3 Lowering to the lower liquid level position Lc at the time of leakage, the fastening member 30 is melted by the heat of the leaked liquid metal, and the lower sleeve 21b is also dropped or melted, leaving the upper sleeve 21a, and the heating portion at the lower end of the heat pipe 20 Is exposed and directly contacts the leaked liquid metal 3a.

Thereby, the heating part at the lower end of the heat pipe 20 immersed in the leaking liquid metal 3a absorbs the heat of the leaking liquid metal 3a, and is newly passively dissipated by the cooling part at the upper end of the heat pipe 20 outside the building. A reactor vessel auxiliary cooling system is configured.
In addition, the effect | action and function of many closing members 15 arrange | positioned in the bottom part 14 of the silo 7 are the same as that of said embodiment.

  According to the third embodiment, in the event of an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6 is a virtual event that is unlikely to occur at an extreme, the leakage liquid metal 3a and the air In addition, a new air cooling path is formed, and a new heat radiation path is formed by a heat pipe exposed by melting or dropping of the lower sleeve, and thereby a passive and multiplexed new path is formed. It is possible to construct a reactor vessel auxiliary cooling system, and it is possible to reliably and efficiently remove the residual decay heat that continues to be generated from the core after the shutdown operation.

[Fourth Embodiment]
A liquid metal cooled nuclear reactor according to a fourth embodiment of the present invention will be described with reference to FIGS.
(Constitution)
In the fourth embodiment, as shown in FIGS. 7A and 7B, the lower end of the upper sleeve 21a and the upper end of the lower sleeve 21b are made of a bimetal or a shape memory alloy, as shown in FIG. As shown, it is normally bent and engaged with each other.

  In the event of an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6, which is an extremely unlikely virtual event, occurs when the lower end of the upper sleeve 21a and the upper end of the lower sleeve 21b reach the temperature of the leaked liquid metal 3a. It is deformed by the characteristics of the bimetal or shape memory alloy, becomes almost straight, and the engagement is released. As a result, the lower support 21b falls, the upper support 21a remains, the heating portion at the lower end of the heat pipe 20 is exposed, and directly contacts the leaked liquid metal 3a.

(Function)
In the liquid metal cooled nuclear reactor configured as described above, in the event of an emergency in which a liquid metal leak from the reactor vessel 4 and the containment vessel 6 is a virtual event that is unlikely to occur in the extreme, the leaked liquid metal 3a is usually When the liquid level position Lc is lower than the time of leakage, and the lower end of the upper sleeve 21a and the upper end of the lower sleeve 21b reach the temperature of the leaked liquid metal 3a, it is deformed by the characteristics of the bimetal or shape memory alloy and becomes substantially straight. The engagement is released, the lower sleeve 21b falls, the heating part at the lower end of the heat pipe 20 is exposed, and directly contacts the leaked liquid metal 3a (FIGS. 8A and 8B).

Thereby, the heating part at the lower end of the heat pipe 20 immersed in the leaking liquid metal 3a absorbs the heat of the leaking liquid metal 3a, and is newly passively dissipated by the cooling part at the upper end of the heat pipe 20 outside the building. A reactor vessel auxiliary cooling system is configured.
In addition, the effect | action and function of many closing members 15 arrange | positioned in the bottom part 14 of the silo 7 are the same as that of said embodiment.

  According to the fourth embodiment, in the event of an emergency in which liquid metal leaks from the reactor vessel 4 and the containment vessel 6, which are virtual events that are unlikely to occur in an extreme, the leakage liquid metal 3 a and the air In addition, a new air cooling path is formed, and a new heat dissipation path is formed by a heat pipe exposed by the lower sleeve falling, thereby forming a new passive and multiplexed atom. It becomes possible to construct a reactor vessel auxiliary cooling system, and it is possible to reliably and efficiently remove the residual decay heat that continues to be generated from the core after the stop operation.

  As mentioned above, although the example of the embodiment of the present invention has been described, only a specific example has been illustrated, and the present invention is not particularly limited, and a specific target liquid metal cooling furnace or the like can be changed as appropriate. is there. Further, the operations and effects described in the embodiments and the modifications thereof are merely a list of the most preferable operations and effects resulting from the present invention, and the operations and effects according to the present invention are described in the embodiments of the present invention. It is not limited to the ones.

  DESCRIPTION OF SYMBOLS 1 ... Liquid metal cooling reactor, 2 ... Nuclear fuel core, 3 ... Liquid metal, 3a ... Leakage liquid metal, 4 ... Reactor vessel, 5 ... Gap, 6 ... Containment vessel, 7 ... Silo, 8 ... Containment dome, 9 ... Furnace upper chamber, 10 ... collector, 12 ... air descending channel, 13 ... air rising channel, 14 ... bottom, 15 ... closing member, 16 ... air intake, 17 ... duct, 18 ... air outlet, 20 ... Heat pipe, 21 ... sleeve, 21a ... upper sleeve, 21b ... lower sleeve, 30 ... fastening member, 35 ... annular space, Ln ... normal liquid level position, Lc ... leakage liquid level position.

Claims (6)

A reactor vessel filled with a liquid metal, a containment vessel for storing the reactor vessel, a silo for housing the containment vessel via an annular space, and dividing the annular space, the air descends to the silo side In a liquid metal cooled nuclear reactor having a collector consisting of a cylindrical sleeve that forms an air rising channel on the channel and the containment vessel side,
A number of closing members disposed at the bottom of the silo and having a specific gravity smaller than the liquid metal;
A plurality of heat pipes having one end arranged inside the sleeve of the collector and the other end arranged outside the building,
A liquid metal cooled nuclear reactor in which the melting point of the sleeve is lower than the temperature of the leaked liquid metal. A reactor vessel filled with a liquid metal, a containment vessel for storing the reactor vessel, a silo for housing the containment vessel via an annular space, and dividing the annular space, the air descends to the silo side In a liquid metal cooled nuclear reactor having a collector consisting of a cylindrical sleeve that forms an air rising channel on the channel and the containment vessel side,
A number of closing members having a specific gravity smaller than that of the liquid metal disposed at the bottom of the silo;
A plurality of heat pipes having one end arranged inside the sleeve of the collector and the other end arranged outside the building,
A liquid metal cooled nuclear reactor, wherein the sleeve comprises an upper sleeve and a lower sleeve, and the upper sleeve and the lower sleeve are connected by a fastening member having a melting point lower than the temperature of the leaked liquid metal.   The liquid metal cooled nuclear reactor according to claim 2, wherein a melting point of the lower sleeve is lower than a temperature of the leaked liquid metal. A reactor vessel filled with a liquid metal, a containment vessel for storing the reactor vessel, a silo for housing the containment vessel via an annular space, and dividing the annular space, the air descends to the silo side In a liquid metal cooled nuclear reactor having a collector consisting of a cylindrical sleeve that forms an air rising channel on the channel and the containment vessel side,
A number of closing members having a specific gravity smaller than that of the liquid metal disposed at the bottom of the silo;
A plurality of heat pipes having one end arranged inside the sleeve of the collector and the other end arranged outside the building,
A liquid metal cooling atom characterized in that the sleeve comprises an upper sleeve and a lower sleeve whose connection portion is made of a bimetal or a shape memory alloy, and the connection between the upper collector and the lower collector is released by deformation due to the temperature of the leaked liquid metal. Furnace.   5. The liquid metal cooled nuclear reactor according to claim 1, wherein the closing member is made of a solid or hollow heat-resistant liquid metal material.   The liquid metal cooled nuclear reactor according to any one of claims 1 to 5, wherein a working fluid that operates at a temperature of the leaked liquid metal is enclosed in the heat pipe.

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