JP2016011725A - Pipeline protection device and nuclear facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nuclear facility that suppresses ejection of fluid to the surroundings of a pipeline in a case where rupture occurs in the pipeline passing high-pressure and high-temperature fluid, and can protect a structure and equipment.SOLUTION: In a nuclear facility, a pipeline protection device 1 includes an external cylinder 2 covering the outer periphery of a welding part 11a in a second pipeline 11 connected by welding to a first pipeline 10 where high-temperature and high-pressure fluid circulates. Also, the second pipeline is connected to the first pipeline via a nozzle neck 12, and the external cylinder covers the outer periphery of the welding part of the second pipeline. Further, an extension part in the second pipeline is provided so as to penetrate through a wall 13, and the cylinder is attached to the wall.

Description

  The present invention relates to a pipe protection device that suppresses the ejection of fluid around a pipe when, for example, a pipe through which a high-temperature and high-pressure fluid passes is broken, and a nuclear facility to which the pipe protection device is applied.

  Conventionally, for example, a pipe protection device (pipe whip and jet force prevention device) described in Patent Document 1 has a plurality of clamp pipe members having a shape that can be adapted to the outside of the pipe, and pipes the plurality of clamp pipe members. The clamp pipe members are arranged in contact with the outside of the pipe, and a plurality of clamp pipe members constitute the clamp pipe so that the pipes are tightly held and clamped. Further, in the pipe protection device described in Patent Document 1, a locking member is fixedly protruded outside the pipe, and a through-hole penetrating in the thickness direction is formed in at least one clamp pipe member. By inserting a locking member into the pipe, the pipe is prevented from coming out of the clamp pipe.

JP-A-55-97594

  The pipe protection device described in Patent Document 1 described above merely inserts the through hole of the clamp pipe member that forms the clamp pipe into the pipe locking member. When the pipe breaks, the clamp pipe is inserted into the clamp pipe. High-temperature and high-pressure fluid will be ejected to the outside. As described above, the pipe protection device described in Patent Document 1 is difficult to suppress the ejection of fluid. As a result, the influence of the ejected fluid on the structure around the pipe or the steam of the fluid Since it affects the surrounding equipment (electric equipment, etc.), it becomes difficult to protect the structure and equipment.

  This invention solves the subject mentioned above, and it aims at providing the piping protective device and nuclear power installation which can suppress the ejection of the fluid around piping.

  In order to achieve the above-described object, the pipe protection device of the present invention includes an outer cylinder that covers an outer periphery of a welded portion in a second pipe joined by welding to a first pipe through which a fluid flows. .

  According to this pipe protection device, when the second pipe breaks from the welded portion at the place where the second pipe is connected to the first pipe, the outer cylinder covers the outer periphery of the second pipe. Since the fluid ejected from the broken portion of the second pipe is blocked by the outer cylinder, the ejection of the fluid around the second pipe can be suppressed. As a result, it is possible to prevent the fluid ejected from the second pipe from affecting the structures and equipment around the second pipe and protect the structures and equipment. In addition, the structure does not need to be provided with a jet barrier that blocks the fluid ejected from the second pipe, and a large load can be eliminated on the structure side. In addition, by suppressing the ejection of fluid around the second pipe, there is no need to partition the second pipe and the safety-critical equipment physically, and the building shape of the equipment is affected. You can prevent the situation.

  In the pipe protection device of the present invention, the second pipe is joined to the first pipe via a nozzle, and the outer cylinder is an outer periphery of a welded portion of the second pipe with respect to the nozzle It is characterized by covering.

  According to this pipe protection device, when the second pipe breaks starting from the welded portion with respect to the nozzle, the outer pipe covers the outer periphery of the second pipe. Since the cylinder is dammed up, the ejection of fluid around the second pipe can be suppressed.

  Further, in the pipe protection device of the present invention, an extension portion in the second pipe is provided so as to penetrate the wall, and the outer cylinder is attached to the wall.

  According to this piping protection device, the outer cylinder can be attached in a state of being appropriately supported with respect to the wall. When the second pipe is connected to the first pipe and the extended part of the second pipe penetrates the wall, the second pipe is broken by the outer cylinder when the second pipe breaks from the welded part. Since the outer periphery of the second pipe is covered, the fluid ejected from the fracture portion of the second pipe is blocked by the outer cylinder, so that the ejection of the fluid around the second pipe can be suppressed.

  In the pipe protection device of the present invention, a sleeve that forms a hole through which the second pipe passes is provided on the wall, and the outer cylinder is fixed to the sleeve.

  According to this piping protection device, the outer cylinder can be attached in a state of being appropriately supported with respect to the wall. When the second pipe is connected to the first pipe and the extended part of the second pipe penetrates the wall, the second pipe is broken by the outer cylinder when the second pipe breaks from the welded part. Since the outer periphery of the second pipe is covered, the fluid ejected from the fracture portion of the second pipe is blocked by the outer cylinder, so that the ejection of the fluid around the second pipe can be suppressed.

  In the pipe protection device of the present invention, the pipe protection device includes a side cover member that is fixed to an end portion of the outer cylinder and extends inward in the radial direction of the outer cylinder while continuing in the circumferential direction of the outer cylinder. To do.

  According to this pipe protection device, the side cover member narrows the interval between the inner surface side of the outer cylinder and the outer surface side of the second pipe, so that the fluid ejected from the fracture portion of the second pipe is blocked by the side cover member. Therefore, it is possible to suppress the ejection of fluid around the second pipe.

  In order to achieve the above object, the nuclear power facility of the present invention generates a high-temperature and high-pressure fluid by heat generated in a nuclear reactor, and is joined to the first pipe and the first pipe by welding. In the nuclear power facility using the fluid, any one of the above-described pipe protection devices is applied to the second pipe.

  According to this nuclear power facility, the piping protective device prevents the situation in which the fluid ejected from the second pipe affects the internal structures and equipment around the second pipe and protects the structure and equipment. be able to. For this reason, it is not necessary to install the jet barrier which interrupts the fluid which ejected from the 2nd piping in the structure in an installation, and the effect | action of a big load can be eliminated on the structure side. In addition, by suppressing the ejection of fluid around the second pipe, there is no need to partition the second pipe and the safety-critical equipment physically, and the building shape of the equipment is affected. You can prevent the situation.

  According to the present invention, it is possible to suppress the ejection of fluid around the pipe.

FIG. 1 is a schematic configuration diagram illustrating an example of a nuclear facility according to an embodiment of the present invention. FIG. 2 is a cross-sectional view in the pipe extending direction of the pipe protection device according to the embodiment of the present invention. FIG. 3 is a sectional view in the pipe radial direction of the pipe protection device according to the embodiment of the present invention. FIG. 4 is a cross-sectional view in the pipe extending direction of another pipe protection device according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic configuration diagram illustrating an example of a nuclear facility according to the present embodiment. The nuclear facility shown in FIG. 1 is a pressurized water reactor (PWR). In this nuclear power facility, a reactor pressure vessel 101, a pressurizer 102, a steam generator 103, and a primary cooling water pump 104 are sequentially connected by a primary cooling water pipe 105 in a reactor containment vessel 100, and primary cooling that is a fluid is performed. A water circulation path is constructed.

  The reactor pressure vessel 101 stores therein a plurality of fuel assemblies 101a, which are cores, in a sealed state, and a vessel body 101b and a vessel lid 101c mounted on the upper portion thereof so that the fuel assemblies 101a can be inserted and removed. It is comprised by. The container lid 101c is provided so as to be openable and closable with respect to the container main body 101b. The container body 101b has a cylindrical shape with an upper opening and a lower hemisphere that is closed, and an inlet-side nozzle 101d and an outlet-side nozzle 101e that supply and discharge light water as primary cooling water at the upper part. Is provided. The outlet side nozzle 101e is connected to the primary cooling water pipe 105 so as to communicate with the inlet side water chamber 103a of the steam generator 103. The inlet side nozzle 101d is connected to the primary cooling water pipe 105 so as to communicate with the outlet side water chamber 103b of the steam generator 103.

  The steam generator 103 is provided with an inlet-side water chamber 103a and an outlet-side water chamber 103b partitioned by a partition plate 103c in a lower part formed in a hemispherical shape. The inlet side water chamber 103a and the outlet side water chamber 103b are separated from the upper side of the steam generator 103 by a tube plate 103d provided on the ceiling portion. On the upper side of the steam generator 103, an inverted U-shaped heat transfer tube 103e is provided. Each end of the heat transfer tube 103e is supported by the tube plate 103d so as to connect the inlet side water chamber 103a and the outlet side water chamber 103b. The inlet-side water chamber 103a is connected to the inlet-side primary cooling water pipe 105, and the outlet-side water chamber 103b is connected to the outlet-side primary cooling water pipe 105. In addition, the steam generator 103 is connected to the upper side upper end partitioned by the tube plate 103d, the outlet side secondary cooling water pipe 106a, and the upper side part is connected to the inlet side secondary cooling water pipe 106b. Has been.

  Further, in the nuclear power facility, the steam generator 103 is connected to the steam turbine 107 via the secondary cooling water pipes 106a and 106b outside the reactor containment vessel 100, so that a circulation path of secondary cooling water that is a fluid is configured. ing.

  The steam turbine 107 includes a high-pressure turbine 108 and a low-pressure turbine 109, and a generator 110 is connected thereto. In addition, the high-pressure turbine 108 and the low-pressure turbine 109 are connected to a moisture separation heater 111 that is branched from the secondary cooling water pipe 106a. The secondary cooling water pipe 106 a is provided with a steam isolation valve (open / close valve) 119 on the way from the steam generator 103 to the high pressure turbine 108 and the low pressure turbine 109. The steam isolation valve 119 is closed in an emergency or the like, and the steam from the steam generator 103 to the high pressure turbine 108 and the low pressure turbine 109 is isolated. The low pressure turbine 109 is connected to the condenser 112. The condenser 112 is connected to the secondary cooling water pipe 106b. The secondary cooling water pipe 106b is connected to the steam generator 103 as described above, and reaches from the condenser 112 to the steam generator 103, and the condensate pump 113, the low-pressure feed water heater 114, the deaerator 115, and the main feed water pump. 116, a high-pressure feed water heater 117 and a main feed water valve (open / close valve) 118 are provided.

  Therefore, in the nuclear power facility, the primary cooling water is heated in the reactor pressure vessel 101 to become a high temperature and a high pressure, and is pressurized by the pressurizer 102 to maintain the pressure constant, while the steam is passed through the primary cooling water pipe 105. It is supplied to the generator 103. In the steam generator 103, heat exchange between the primary cooling water and the secondary cooling water is performed, whereby the secondary cooling water evaporates and becomes steam. The cooled primary cooling water after heat exchange is recovered to the primary cooling water pump 104 side via the primary cooling water pipe 105 and returned to the reactor pressure vessel 101. On the other hand, the secondary cooling water converted into steam by heat exchange is supplied to the steam turbine 107. In connection with the steam turbine 107, the moisture separator / heater 111 removes moisture from the exhaust from the high-pressure turbine 108, further heats it to an overheated state, and then sends it to the low-pressure turbine 109. The steam turbine 107 is driven by the steam of the secondary cooling water, and the power is transmitted to the generator 110 to generate power. Steam used for driving the turbine is discharged to the condenser 112. The condenser 112 exchanges heat between the cooling water (for example, seawater) taken by the pump 112b through the intake pipe 112a and the steam discharged from the low-pressure turbine 109, and condenses the steam to produce a low-pressure saturated liquid. Return to. The cooling water used for heat exchange is discharged from the drain pipe 112c. Further, the condensed saturated liquid becomes secondary cooling water, and is sent out of the condenser 112 by the condensate pump 113 through the secondary cooling water pipe 106b. Further, the secondary cooling water passing through the secondary cooling water pipe 106b is heated by the low-pressure feed water heater 114, for example, by the low-pressure steam extracted from the low-pressure turbine 109, and dissolved oxygen and non-condensed gas (ammonia gas) in the deaerator 115. After the impurities such as) are removed, the water is fed by the main feed pump 116 and heated by the high-pressure steam extracted from the high-pressure turbine 108 by the high-pressure feed water heater 117 and then returned to the steam generator 103. Here, a system for supplying secondary cooling water to the steam generator 103 is referred to as a main water supply system. In the main water supply system, the main water supply pump 116, the main water supply valve 118, and the like are controlled in order to maintain the water level of the secondary cooling water of the steam generator 103.

  2 is a cross-sectional view of the pipe protection device according to the present embodiment in the pipe extending direction, and FIG. 3 is a cross-sectional view of the pipe protection device according to the present embodiment in the pipe radial direction (position AA in FIG. 2). FIG. Moreover, FIG. 4 is sectional drawing of the piping extension direction of the other piping protection apparatus which concerns on this embodiment.

  The pipe protection device 1 of the present embodiment is applied to the nuclear facility as described above. For example, the pipe protection device 1 is disposed in the secondary cooling water pipes 106a and 106b as pipes through which secondary cooling water that is a fluid is circulated in a nuclear facility. Specifically, in the secondary cooling water pipe 106 a, the pipe protection device 1 includes a part immediately after being drawn out of the partition wall 100 a of the reactor containment vessel 100 or equipment (steam generator 103, high pressure turbine 108, low pressure turbine 109 , Moisture separation heater 111 and steam isolation valve 119). Further, in the secondary cooling water pipe 106b, the pipe protection device 1 is a part immediately after being pulled out of the partition wall 100a of the reactor containment vessel 100 or equipment (steam generator 103, condenser 112, condensate pump 113). , The low pressure feed water heater 114, the deaerator 115, the main feed water pump 116, the high pressure feed water heater 117, and the main feed valve 118). In addition, the piping protection apparatus 1 may be arrange | positioned at each welding connection part in the primary cooling water pipe 105 as piping by which the primary cooling water which is a fluid distribute | circulates in a nuclear power installation. The pipe protection device 1 according to the present embodiment is not limited to nuclear facilities, but is applied to pipes through which high-temperature and high-pressure fluid is circulated. The fluid includes liquid such as high temperature water and gas such as steam.

  As shown in FIG. 2, the pipe protection device 1 of the present embodiment is particularly suitable for the first pipe 10 in pipes through which fluid flows, such as the secondary cooling water pipes 106 a and 106 b and the primary cooling water pipe 105 described above. It is applied to the second pipe 11 joined by welding. The first pipe 10 is a pipe through which the main flow of the fluid is circulated, and the second pipe 11 is a pipe branched from the first pipe 10 and through which the fluid is divided. The second pipe 11 is joined to the first pipe 10 via a nozzle 12. The nozzle 12 is joined to the first pipe 10 by welding, and the second pipe 11 is joined by welding at the welded portion 11a. Note that the welded portion 11 a is not limited to the joint portion with the nozzle pedestal 12 but may be a portion joined to the first pipe 10 without the nozzle pedestal 12 interposed. Further, the second pipe 11 is provided with an extending portion branched from the first pipe 10 penetrating the wall 13. The wall 13 is provided with a sleeve 14 in order to form a hole for levering the second pipe 11. The sleeve 14 is formed of, for example, carbon steel that can maintain rigidity. The first pipe 10 is fixed by a fixing member 15. The fixing member 15 is fixed to a fixing portion (not shown) having rigidity in the facility. Therefore, the 1st piping 10 is supported with respect to the fixed part which has the rigidity in an installation. On the other hand, the 2nd piping 11 is supported by the 1st piping 10 supported by the fixing | fixed part in a facility.

  As shown in FIGS. 2 and 3, the pipe protection device 1 provided in the second pipe 11 includes an outer cylinder 2 and a side cover member 3.

  As shown in FIGS. 2 to 4, the outer cylinder 2 is an outer periphery of the second pipe 11 and covers the welded portion 11 a of the second pipe 11, and is a cylinder along the extending direction of the second pipe 11. And is divided into a plurality (two in the figure) of divided outer cylinders 2a in the radial direction of the second pipe 11 for attachment to the second pipe 11. The outer cylinder 2 is disposed so as to cover the outer periphery of the second pipe 11 with each divided outer cylinder 2a, and is attached to the second pipe 11 by welding a portion where each divided outer cylinder 2a is abutted. The outer cylinder 2 is formed of, for example, carbon steel that can maintain rigidity. In addition, as shown in FIGS. 2-4, a predetermined space | interval is provided between the outer surface of the 2nd piping 11, and the inner surface of the outer cylinder 2. As shown in FIG.

  The outer cylinder 2 is fixed to a sleeve 14 provided on the wall 13. FIG. 2 shows a form in which the outer cylinder 2 is joined to the sleeve 14 by seal welding. In FIG. 4, the flange portion 4 facing the flange 14a at the opening edge of the hole in the sleeve 14 is joined to the end portion of the outer cylinder 2 by welding, and the flange portion 4 is fixed to the flange 14a by bolts 5. The form to be done is shown.

  The side cover member 3 can maintain rigidity, for example, is formed of carbon steel, and is larger than the outer diameter of the second pipe 11 and larger than the inner diameter of the outer cylinder 2 as shown in FIGS. Has a small inner diameter, and has an outer diameter equivalent to the outer diameter of the outer cylinder 2 and is formed in an annular shape. As shown in FIG. 3, the side lid member 3 includes a plurality (two in the figure) of divided side lid members in the radial direction of the second pipe 11 for attachment to the second pipe 11 in the same manner as the outer cylinder 2. It is divided into 3a. The side lid member 3 is joined by welding the portion where each divided side lid member 3a is abutted. For this reason, the side lid member 3 is arranged so that the inner end 3 b of each divided side lid member 3 a is on the radially inner side (annular inner side) of the outer cylinder 2 and faces the outer peripheral surface of the second pipe 11. Moreover, the side cover member 3 is one end part of the outer cylinder 2, Comprising with the edge part facing the 1st piping 10, This joined part is joined by welding. For this reason, the side cover member 3 extends radially inward of the outer cylinder 2 at the end of the outer cylinder 2 facing the first pipe 10, and the inner surface side of the outer cylinder 2 and the outer surface of the second pipe 11. Reduce the distance between the sides. In addition, the side cover member 3 is disposed such that the inner end 3 b thereof has a predetermined gap α with respect to the outer peripheral surface of the second pipe 11. This gap α restricts the amount of steam ejected to the environment when the pipe 10 is broken, and when the outer cylinder 2 and the side lid member 3 are deformed by heat in the radial direction of the outer cylinder 2, This is to prevent contact. Although not clearly shown in the figure, the side cover member 3 may be similarly provided at the end of the outer cylinder 2 facing the wall 13. In this case, the outer cylinder 2 is fixed to the sleeve 14 via the side lid member 3 provided at the end of the outer cylinder 2 facing the wall 13.

  According to the pipe protection device 1, when the second pipe 11 is broken from the welded portion 11 a at the place where the second pipe 11 is connected to the first pipe 10, the second pipe 11 is cut by the outer cylinder 2. Since the outer pipe 2 dams up the fluid ejected from the fracture portion of the second pipe 11, the ejection of fluid around the second pipe 11 can be suppressed. As a result, it is possible to prevent the fluid ejected from the second pipe 11 from affecting the structures and devices around the second pipe 11 and protect the structures and devices. In addition, it is not necessary to install a jet barrier that blocks the fluid ejected from the second pipe 11 in the structure, and a large load can be eliminated on the structure side. Further, by suppressing the ejection of fluid around the second pipe 11, there is no need for partitioning for physically separating the second pipe 11 and the equipment important for safety, and the building shape of the equipment is obtained. It can prevent the situation that influences.

  In the pipe protection device 1 of the present embodiment, the second pipe 11 is joined to the first pipe 10 via the nozzle 12, and the outer cylinder 2 is welded to the second pipe 11 to the nozzle 12. The outer periphery of the part 11a is covered. Therefore, when the second pipe 11 is broken starting from the welded portion 11a with respect to the nozzle 12, the outer cylinder 2 covers the outer periphery of the second pipe 11. Since damming is performed by the cylinder 2, the ejection of fluid around the second pipe 11 can be suppressed.

  Further, in the pipe protection device 1 of the present embodiment, the extending part of the second pipe 11 is provided so as to penetrate the wall 13, and the outer cylinder 2 is attached to the wall 13. Therefore, the outer cylinder 2 can be attached in a state where it is supported appropriately with respect to the wall 13. And when the 2nd piping 11 is connected to the 1st piping 10, and the 2nd piping 11 fractures | ruptures from the welding part 11a in the place where the extension part of the 2nd piping 11 penetrates the wall 13, Since the outer cylinder 2 covers the outer periphery of the second pipe 11, the fluid ejected from the fractured portion of the second pipe 11 is blocked by the outer cylinder 2, thereby suppressing the ejection of fluid around the second pipe 11. can do.

  Further, in the pipe protection device 1 of the present embodiment, a sleeve 14 that forms a hole through which the second pipe 11 passes is provided on the wall 13, and the outer cylinder 2 is fixed to the sleeve 14. Therefore, the outer cylinder 2 can be attached in a state where it is supported appropriately with respect to the wall 13. And when the 2nd piping 11 is connected to the 1st piping 10, and the 2nd piping 11 fractures | ruptures from the welding part 11a in the place where the extension part of the 2nd piping 11 penetrates the wall 13, Since the outer cylinder 2 covers the outer periphery of the second pipe 11, the fluid ejected from the fractured portion of the second pipe 11 is blocked by the outer cylinder 2, thereby suppressing the ejection of fluid around the second pipe 11. can do.

  Further, the pipe protection device 1 according to the present embodiment includes the side cover member 3 that is fixed to the end of the outer cylinder 2 and extends inward in the radial direction of the outer cylinder 2 while continuing in the circumferential direction of the outer cylinder 2. Therefore, the side lid member 3 dams the fluid ejected from the fractured portion of the second pipe 11 by the side lid member 3 in order to narrow the gap between the inner surface side of the outer cylinder 2 and the outer surface side of the second pipe 11. Therefore, the ejection of fluid around the second pipe 11 can be suppressed.

  The nuclear power facility according to the present embodiment generates a high-temperature and high-pressure fluid by heat generated in the nuclear reactor, and supplies the first pipe 10 (secondary cooling water pipes 106a and 106b, the primary cooling water pipe 105, etc.) and the first pipe 10 to each other. It is a nuclear facility that uses the fluid that is fed by the second pipe 11 joined by welding, and the pipe protection device 1 described above is preferably applied to the second pipe 11.

  According to this nuclear power facility, the pipe protective device 1 prevents the fluid ejected from the second pipe 11 from affecting the facilities and equipment in the equipment around the second pipe 11, and the structure and equipment. Can be protected. For this reason, it is not necessary to install the jet barrier which interrupts the fluid which ejected from the 2nd piping 11 in the structure in an installation, and the effect | action of a big load can be eliminated on the structure side. Further, by suppressing the ejection of fluid around the second pipe 11, there is no need for partitioning for physically separating the second pipe 11 and the equipment important for safety, and the building shape of the equipment is obtained. It can prevent the situation that influences.

  In addition, in each embodiment mentioned above, although application of the piping protection apparatus 1 is illustrated as a straight pipe part of the 2nd piping 11, the piping protection apparatus 1 is applicable also in the curved part of the 2nd piping 11. FIG. . In this case, the extending direction of the second pipe 11 refers to each direction facing after bending.

  In addition, although the nuclear equipment mentioned above demonstrated what used the pressurized water reactor (PWR: Pressurized Water Reactor), it is not this limitation. For example, although not clearly shown in the figure, it may be a nuclear facility using a boiling water reactor (BWR), and the above-described piping protection device 1 uses the steam generated in the boiling reactor. The present invention can also be applied to piping that passes through.

DESCRIPTION OF SYMBOLS 1 Piping protection apparatus 2 Outer cylinder 3 Side cover member 3b Inner end 10 1st piping 11 2nd piping 11a Welding part 12 Pipe stand 13 Wall 14 Sleeve

Claims (6)

  A pipe protection device comprising an outer cylinder covering an outer periphery of a welded portion in a second pipe joined by welding to a first pipe through which a fluid is circulated.   The said 2nd piping is joined to said 1st piping via the nozzle, The said outer cylinder covers the outer periphery of the welding part of said 2nd piping with respect to the said nozzle. Piping protection device as described in 1.   3. The pipe protection device according to claim 1, wherein an extending portion of the second pipe is provided so as to penetrate the wall, and the outer cylinder is attached to the wall.   The pipe protection device according to claim 3, wherein a sleeve that forms a hole through which the second pipe passes is provided on the wall, and the outer cylinder is fixed to the sleeve.   The side cover member which is fixed to the edge part of the said outer cylinder, and is extended in the radial direction inner side of the said outer cylinder, continuing in the circumferential direction of the said outer cylinder is provided. Piping protection device as described in 1. A nuclear power facility that generates a high-temperature and high-pressure fluid by heat generated in a nuclear reactor and sends the fluid through a first pipe and a second pipe joined by welding to the first pipe.
A nuclear power facility, wherein the piping protection device according to any one of claims 1 to 5 is applied to the second piping.

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