JP6395458B2 - Piping protection device, piping protection method, and nuclear facility - Google Patents

Description

  The present invention is applied, for example, to a pipe protection device, a pipe protection method, and the pipe protection device that suppress the ejection of fluid around the pipe when a pipe that allows passage of high-temperature and high-pressure fluid breaks. Related to nuclear facilities.

  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 protection apparatus and piping protection method which can suppress the ejection of the fluid around piping, and a nuclear power installation.

  In order to achieve the above-described object, a pipe protection device according to the present invention includes an outer cylinder that covers an outer periphery of a pipe through which a fluid flows, and one end of the outer cylinder that is fixed in the circumferential direction of the outer cylinder. A first side lid member that extends continuously inward in the radial direction of the outer cylinder and a radially outer side of the outer cylinder that is fixed to the other end of the outer cylinder and continues in the circumferential direction of the outer cylinder And a second side lid member extending to the top.

  According to this pipe protection device, for example, in a narrow place where the pipe penetrates the wall surface or the like, the pipe extends to the radially inner side of the outer cylinder at one end of the outer cylinder covering the outer periphery of the pipe. A first side cover member is provided so as to reduce the distance from the outer cylinder, and the second side cover member is provided at the other end of the outer cylinder so as to extend radially outward of the outer cylinder and to reduce the distance from the wall surface. Provide. As a result, when the pipe breaks, the outer cylinder covers the outer circumference of the pipe, so that the fluid ejected from the broken part of the pipe is blocked by the outer cylinder, thereby suppressing the ejection of fluid around the pipe. Can do. Moreover, the first side lid member narrows the space between the outer cylinder and the pipe on one end side of the outer cylinder, and the second side lid member is between the wall surface on the other end side facing the wall surface of the outer cylinder. The interval is narrowed. For this reason, since the fluid ejected from the fracture | rupture part of piping is blocked by the 1st side cover member and the 2nd side cover member, the ejection of the fluid around piping can be suppressed. As a result, it is possible to prevent the fluid ejected from the pipe from affecting the structures and equipment around the 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 pipe, and the effect of a large load on the structure side can be eliminated. In addition, by suppressing the ejection of fluid around the piping, there is no need for partitioning to physically separate the piping and safety-critical equipment, preventing situations that affect the building shape of the equipment. be able to.

  Further, in the pipe protection device of the present invention, the outer cylinder that covers the outer periphery of the portion that penetrates the wall surface in the pipe through which the fluid flows, and the outer cylinder that is fixed to the end of the outer cylinder on the side opposite to the wall surface A first side cover member provided extending inward in the radial direction of the outer cylinder while continuing in the circumferential direction of the outer cylinder, and a circumferential direction of the outer cylinder fixed to an end portion of the outer cylinder facing the wall surface And a second side lid member provided to extend outward in the radial direction of the outer cylinder.

  According to this pipe protection device, when the pipe breaks in a narrow place where the pipe passes through the wall surface, the outer cylinder covers the outer periphery of the pipe, so that the fluid ejected from the broken part of the pipe Therefore, the ejection of fluid around the pipe can be suppressed. In addition, the first side cover member narrows the space between the outer cylinder and the pipe at the end opposite to the wall surface of the outer cylinder, and the second side at the end on the side facing the wall surface of the outer cylinder. The gap between the lid member and the wall surface is narrowed. For this reason, since the fluid ejected from the fracture | rupture part of piping is blocked by the 1st side cover member and the 2nd side cover member, the ejection of the fluid around piping can be suppressed. As a result, it is possible to prevent the fluid ejected from the pipe from affecting the structures and equipment around the 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 pipe, and the effect of a large load on the structure side can be eliminated. In addition, by suppressing the ejection of fluid around the piping, there is no need for partitioning to physically separate the piping and safety-critical equipment, preventing situations that affect the building shape of the equipment. be able to.

  Further, in the pipe protection device according to the present invention, the outer cylinder is provided by being divided so that the end portions can be approached or separated from each other.

  According to this piping protection device, the setting of the gap with respect to the outer peripheral surface of the pipe in the first side lid member and the adjustment of the gap with respect to the wall surface of the second side lid member can be performed independently, and the pipe wall is penetrated. It can be easily attached to the pipe in the narrow part.

  In order to achieve the above-described object, the pipe protection method of the present invention includes a step of covering the outer periphery of a portion penetrating a wall surface in a pipe through which a fluid is circulated with a first outer cylinder, and the wall surface of the first outer cylinder. A step of fixing a first side cover member provided extending inward in the radial direction of the first outer cylinder while being continuous in the circumferential direction of the first outer cylinder at the opposite end, and extending the pipe A step of covering the outer periphery of the pipe that is closest to the wall surface by a second outer cylinder that is movable relative to the first outer cylinder in a direction, and an end of the second outer cylinder facing the wall surface Fixing the second side cover member provided extending to the outer side in the radial direction of the second outer cylinder while being continuous in the circumferential direction of the second outer cylinder, and the first outer cylinder on the pipe side Then, the second outer cylinder is moved relative to the first outer cylinder to adjust the gap with respect to the wall surface of the second side lid member. And, characterized in that it comprises a, and fixing the second outer tube to the pipe side and the first outer tube.

  According to this pipe protection method, since the setting of the gap with respect to the outer peripheral surface of the pipe in the first side lid member and the adjustment of the gap with respect to the wall surface of the second side lid member are performed independently, the wall surface of the pipe is penetrated. It can be easily attached to the pipe at the portion.

  In order to achieve the above-mentioned object, the nuclear power plant of the present invention is a nuclear power plant that generates a high-temperature and high-pressure fluid by heat generated in a nuclear reactor and sends the fluid by piping, and uses the fluid. Further, any one of the above-described piping protection devices is applied.

  According to this nuclear power facility, the pipe protection device can prevent the fluid ejected from the pipe from affecting the facilities and equipment in the equipment around the pipe and protect the structure and equipment. For this reason, it is not necessary to install the jet barrier which interrupts the fluid which ejected from 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 piping, there is no need for partitioning to physically separate the piping and safety-critical equipment, preventing situations that affect the building shape of the equipment. be able to.

  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 perspective view of the pipe protection device according to the first embodiment of the present invention. FIG. 3 is a plan cross-sectional view of the pipe protection device according to the first embodiment of the present invention in the pipe extending direction. FIG. 4 is a side cross-sectional view in the pipe extending direction of the pipe protection device according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view in the pipe radial direction of the pipe protection device according to Embodiment 1 of the present invention. FIG. 6 is a side cross-sectional view in the pipe extending direction of the pipe protection device according to the second embodiment of the present invention. FIG. 7 is a process diagram of the piping protection method according to the second embodiment of the present invention. FIG. 8 is a process diagram of the piping protection method according to the second embodiment of the present invention. FIG. 9 is a process diagram of the piping protection method according to the second 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.

[Embodiment 1]
FIG. 2 is a perspective view of the pipe protection device according to the present embodiment, FIG. 3 is a plan sectional view of the pipe protection device according to the present embodiment in the pipe extending direction, and FIG. FIG. 5 is a side cross-sectional view of the pipe protection device in the pipe extending direction, and FIG. 5 is a cross-sectional view of the pipe protection device according to the present embodiment in the pipe radial direction (A-A position cross-sectional view in FIG. 4).

  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 FIGS. 3 and 4, the pipe protection device 1 according to the present embodiment is particularly suitable for the pipe 10 through which a fluid flows, such as the secondary cooling water pipes 106 a and 106 b and the primary cooling water pipe 105 described above. 11 is applied to a portion penetrating 11.

  The pipe 10 is provided, for example, through the wall of the nuclear facility described above, and is disposed through the wall surface 11 of the wall. Further, the pipe 10 has a portion that penetrates the wall surface 11 fixed by a fixing member 12. The fixing member 12 includes a support column 12A and a connection portion 12B. 12 A of support pillars are fixed to the fixing | fixed part (not shown) which the base end has the rigidity in an installation. The connecting portion 12B connects the support column 12A and the pipe 10, and is formed along the shape of the lower portion of the pipe 10, and is a member having a curved shape so as to form a part of a cylinder. The connecting part 12B has a curved inner surface formed along the outer surface shape of the pipe 10, and the outer edge of the connecting part 12B is joined to the pipe 10 by welding. In addition, as for the connection part 12B, the curved inner surface is formed along the outer surface shape of the piping 10, and a part may be inserted in the through-hole of the wall through which the piping 10 passes. Moreover, as for the connection part 12B, the front-end | tip of 12 A of support pillars is joined to the curved inner surface by welding. Thereby, the fixing member 12 connects and fixes the pipe 10 to a fixing portion (not shown) by the support pillar 12A and the connection portion 12B. Although the support column 12A of the fixing member 12 is illustrated as a prismatic shape, it may be a cylindrical shape or other polygonal column shape.

  As shown in FIGS. 2 to 5, the pipe protection device 1 provided in such a pipe 10 includes an outer cylinder 2, a first side lid member 3, and a second side lid member 4. Yes.

  As shown in FIG. 2, the outer cylinder 2 covers the outer periphery of the pipe 10, is formed in a cylindrical shape along the extending direction of the pipe 10, and the radial direction of the pipe 10 is attached to the pipe 10. Are divided into a plurality (two in the figure) of the divided outer cylinders 2a. The outer cylinder 2 is disposed so as to cover the outer periphery of the pipe 10 with each divided outer cylinder 2a, and is attached to the pipe 10 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. As shown in FIGS. 3 to 5, an interval equal to the plate thickness of the connecting portion 12 </ b> B is provided between the outer surface of the pipe 10 and the inner surface of the outer cylinder 2.

  The outer cylinder 2 has an opening 7 through which the support column 12A of the fixing member 12 is inserted. In the present embodiment, the opening 7 is divided into the respective divided outer cylinders 2a, and is formed so as to open smaller than the size of the outer surface of the connecting portion 12B. In addition, when the outer cylinder 2 is divided | segmented in a horizontal direction, the opening part 7 is collectively provided in one division | segmentation outer cylinder 2a, and is not divided | segmented. The connecting portion 12 </ b> B has a curved outer surface formed along the inner surface shape of the outer cylinder 2. For this reason, the outer cylinder 2 covers the outer periphery of the pipe 10 in a state where the support column 12 </ b> A of the fixing member 12 is inserted into the opening 7. At this time, the connecting portion 12 </ b> B is interposed between the pipe 10 and the outer cylinder 2. And as for the outer cylinder 2, the opening edge of the opening part 7 is joined to the outer surface of the connection part 12B by welding. For this reason, the outer cylinder 2 is provided so as to surround the outer periphery of the pipe 10 even if the fixing member 12 is present.

  The first side cover member 3 can maintain rigidity, for example, is formed of carbon steel, and is larger than the outer diameter of the pipe 10 and larger than the inner diameter of the outer cylinder 2 as shown in FIGS. 3 and 4. Is formed in an annular shape having a small inner diameter and an outer diameter equal to or larger than the outer diameter of the outer cylinder 2. As shown in FIG. 2, the first side lid member 3 includes a plurality (two in the figure) of first divided side lid members in the radial direction of the pipe 10 for attachment to the pipe 10 in the same manner as the outer cylinder 2. It is divided into 3a. The first side lid member 3 is joined by welding the portions where the first divided side lid members 3a are abutted. Therefore, as shown in FIGS. 3 and 4, the first side cover member 3 is configured such that the inner end 3 b of each first divided side cover member 3 a is the radially inner side (annular inner side) of the outer cylinder 2. It arrange | positions so that it may face 10 outer peripheral surfaces. Moreover, the 1st side cover member 3 is one edge part of the outer cylinder 2, Comprising with the edge part on the side opposite to the wall surface 11, This joined part is joined by welding. For this reason, the first side cover member 3 extends radially inward of the outer cylinder 2 at the end opposite to the wall surface 11 of the outer cylinder 2, and the inner surface side of the outer cylinder 2 and the outer surface side of the pipe 10. Reduce the distance between. Further, the first side cover member 3 is arranged such that the inner end 3 b thereof has a predetermined gap α with respect to the outer peripheral surface of the pipe 10. 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 first side lid member 3 are deformed by heat in the radial direction of the outer cylinder 2, This is to prevent contact.

  The second side cover member 4 is formed of, for example, carbon steel capable of maintaining rigidity, and is larger than the outer diameter of the pipe 10 and has an inner diameter of the outer cylinder 2 as shown in FIGS. 3 and 4. While having an equivalent inner diameter, the outer cylinder 2 has an outer diameter larger than the outer diameter and is formed in an annular shape. As shown in FIG. 2, the second side lid member 4 includes a plurality of (two in the figure) second divided side lid members in the radial direction of the pipe 10 for attachment to the pipe 10 in the same manner as the outer cylinder 2. It is divided into 4a. The second side lid member 4 is joined by seal welding at a portion where each second divided side lid member 4a is abutted. Further, as shown in FIGS. 2 and 4, the second side lid member 4 is the other end of the outer cylinder 2, on the end facing the wall surface 11, on the radially outer side of the outer cylinder 2. The protruding flange member 5 is fixed by seal welding. The flange member 5 is divided into a plurality (two in the figure) of divided flange members 5 a in the radial direction of the pipe 10 for attachment to the pipe 10 in the same manner as the outer cylinder 2. The flange member 5 is joined by seal welding at a portion where each divided flange member 5a is abutted. In addition, the flange member 5 is not arrange | positioned in the vicinity of the fixing member 12 so that the fixing member 12 may be avoided in this embodiment. The second side cover member 4 is abutted on the wall surface 11 side with respect to the flange member 5 and is fixed by the bolt 6. The bolt 6 does not pass through the second side lid member 4 and therefore does not contact the wall surface 11. For this reason, as shown in FIG. 3 and FIG. 4, the second side lid member 4 extends outward in the radial direction of the outer cylinder 2, and between the wall surface 11 by the outer surface 4 b facing the wall surface 11, The space | interval between the inner surface side of the outer cylinder 2 and the outer surface side of the piping 10 and the space | interval between the piping 10 and the through-hole of a wall are narrowed. Further, the second side cover member 4 is arranged such that the outer surface 4 b facing the wall surface 11 has a predetermined gap β with respect to the wall surface 11. This gap β is for restricting the amount of steam ejected to the environment when the pipe 10 is broken, and for preventing contact with the wall surface 11 when the outer cylinder 2 is deformed by heat in the extending direction of the pipe 10. It is.

  According to this pipe protection device 1, when the pipe 10 is broken in a narrow place where the pipe 10 passes through the wall surface 11, the outer cylinder 2 covers the outer periphery of the pipe 10. Since the fluid ejected from the pipe is blocked by the outer cylinder 2, the ejection of the fluid around the pipe 10 can be suppressed. In addition, at the end opposite to the wall surface 11 of the outer cylinder 2, the first side cover member 3 narrows the interval between the inner surface side of the outer cylinder 2 and the outer surface side of the pipe 10, and At the end facing the wall surface 11, the second side cover member 4 is between the wall surface 11, the distance between the inner surface side of the outer cylinder 2 and the outer surface side of the pipe 10, and the through hole between the pipe 10 and the wall The distance between is narrowed. For this reason, since the fluid ejected from the fracture | rupture part of the piping 10 is dammed up by the 1st side cover member 3 and the 2nd side cover member 4, the ejection of the fluid around the piping 10 can be suppressed. As a result, it is possible to prevent the fluid ejected from the pipe 10 from affecting the structures and equipment around the pipe 10 and protect the structures and equipment. In addition, it is not necessary to install a jet barrier that blocks the fluid ejected from the pipe 10 in the structure, and it is possible to eliminate the action of a large load on the structure side. Furthermore, by suppressing the ejection of fluid around the pipe 10, there is no need for partitioning for physically separating the pipe 10 and safety-important equipment, and this affects the building shape of the equipment. Can be prevented.

[Embodiment 2]
FIG. 6 is a side cross-sectional view of the pipe protection device according to the present embodiment in the pipe extending direction. The pipe protection device 1 according to the present embodiment is different from the pipe protection device 1 according to the first embodiment described above in that the outer cylinder 2 is provided so that each end portion can be separated or separated. Other configurations are the same. Therefore, in the second embodiment described below, the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 6, the outer cylinder 2 is divided into two, an extension split outer cylinder (first outer cylinder) 2 </ b> A and an extension split outer cylinder (second outer cylinder) 2 </ b> B in the extending direction of the pipe 10. . One expansion / contraction split outer cylinder 2A has an end portion on the side opposite to the wall surface 11 and the first side lid member 3 is fixed thereto. The other stretchable split outer cylinder 2B has an end portion on the side facing the wall surface 11, and the second side cover member 4 is fixed thereto. Then, the inner peripheral surface of the other stretchable split outer tube 2B and the outer peripheral surface of the one stretchable split outer tube 2A are in sliding contact with each other so that the respective end portions slide relative to each other so as to be close to or separate from each other. Thus, the outer cylinder 2 expands and contracts in the extending direction of the pipe 10. And when attaching to the piping 10, each expansion-contraction division | segmentation outer cylinder 2A, 2B is joined by seal welding.

  As shown in FIG. 6, one expansion / contraction split outer cylinder 2A is joined to the outer surface of the connection portion 12B of the fixing member 12 by welding. In addition, the other expandable split outer cylinder 2B has an inner diameter that is increased by sliding its inner peripheral surface into contact with the outer peripheral surface of one expandable split outer cylinder 2A. As shown in FIG. And a gap 8 between the outer surface of the connecting portion 12B. If the gap 8 can be closed by seal welding, there is no problem. However, if the gap 8 cannot be closed by welding, a spacer 9 is inserted into the gap 8 as shown in FIG. The spacer 9 may be integral with or separated from the other stretchable split outer cylinder 2B. In the case of a separate body, the spacer 9 is joined to the other stretchable split outer cylinder 2B by seal welding.

  Hereinafter, a pipe protection method, which is an attachment method for attaching the pipe protection device 1 to the pipe 10 in a configuration in which the outer cylinder 2 is divided into two expansion / contraction split outer cylinders 2A and 2B in the extending direction of the pipe 10, will be described. 7 to 9 are process diagrams of the piping protection method according to the present embodiment.

  FIG. 7 shows a state where the pipe protection device 1 is not attached. That is, the pipe 10 penetrates the wall surface 11, and the penetrated portion is fixed by the fixing member 12.

  From the state shown in FIG. 7, as shown in FIG. 8, the outer periphery of the pipe 10 is covered with one telescopic split outer cylinder (first outer cylinder) 2 </ b> A. One expansion / contraction split outer cylinder 2A is divided into each split outer cylinder 2a in the radial direction of the pipe 10 and is arranged on the outer periphery of the pipe 10 by joining them together by seal welding.

  Moreover, as shown in FIG. 8, the 1st side cover member 3 is fixed to the edge part on the side opposite to the wall surface 11 in one expansion-contraction division | segmentation outer cylinder 2A. The first side lid member 3 is divided into each first divided side lid member 3a in the radial direction of the pipe 10, and is arranged on the outer periphery of the pipe 10 by joining them together by seal welding. Furthermore, it joins to the edge part of one expansion-contraction division | segmentation outer cylinder 2A by seal welding. The first side cover member 3 is prepared in a plurality of types having different inner diameters so that the inner end 3b thereof has a predetermined gap α with respect to the outer peripheral surface of the pipe 10, and a suitable one is selected. Sometimes used.

  Moreover, as shown in FIG. 8, the opening edge of the opening part 7 of one expansion-contraction division | segmentation outer cylinder 2A is joined to the outer surface of the connection part 12B by seal welding. Thereby, one expansion / contraction division | segmentation outer cylinder 2A with which the 1st side cover member 3 was attached is attached to the piping 10 side.

  Furthermore, as shown in FIG. 9, the outer periphery of the pipe 10 that is closest to the wall surface 11 is covered with the other stretchable split outer cylinder (second outer cylinder) 2 </ b> B. The other stretchable split outer cylinder 2B is formed by being divided into each split outer cylinder 2a in the radial direction of the pipe 10, and is arranged on the outer periphery of the pipe 10 by joining them together by welding.

  Moreover, as shown in FIG. 9, the 2nd side cover member 4 is fixed to the edge part by the side which faces the wall surface 11 in the other expansion-contraction division | segmentation outer cylinder 2B. The second side lid member 4 is formed by being divided into the respective second divided side lid members 4a in the radial direction of the pipe 10, and is arranged on the outer periphery of the pipe 10 by joining them together by welding. A bolt 6 is joined to the flange member 5 at the end of the other stretchable split outer cylinder 2B. In addition, each 2nd division | segmentation side cover member 4a is made into the state temporarily joined by the volt | bolt 6 to the flange member 5 of each division | segmentation outer cylinder 2a of the other expansion / contraction division outer cylinder 2B, and the other expansion / division division | segmentation outside is carried out in this state. The divided outer cylinders 2 a of the cylinder 2 </ b> B may be joined to each other by welding, and then each second divided side lid member 4 a may be joined to each other by welding, and then finally joined to the flange member 5 with the bolt 6. In addition, each 2nd division | segmentation side cover member 4a does not need to join by welding.

  Then, after the one expansion / contraction split outer cylinder 2A is attached to the pipe 10 side, as shown in FIG. 6 from the state of FIG. And the gap β with respect to the wall surface 11 of the second side cover member 4 is adjusted, and the opening edge of the opening 7 of the other expansion / division outer cylinder 2B is set to the outer surface of the connection part 12B. It joins with welding. As a result, the other stretchable split outer cylinder 2B is attached to the pipe 10 side with the gap β of the second side lid member 4 adjusted. Furthermore, one expansion / contraction division outer cylinder 2A and the other expansion / contraction division outer cylinder 2B are joined by welding.

  As described above, in the pipe protection device 1 of the present embodiment, the outer cylinder 2 is close to the end portion on the side opposite to the wall surface 11 and the end portion on the side facing the wall surface 11 in the first embodiment described above. It is divided so as to be separable.

  According to this pipe protection device 1, the setting of the gap α with respect to the outer peripheral surface of the pipe 10 at the inner end 3 b of the first side lid member 3 and the adjustment of the gap β with respect to the wall surface 11 of the second side lid member 4 are independent. In the narrow part which penetrated the wall surface 11 of the piping 10, the attachment to the piping 10 can be performed easily.

  In addition, the pipe protection method of the present embodiment includes a step of covering the outer periphery of a portion penetrating the wall surface 11 in the pipe 10 through which a fluid is circulated with one expansion / contraction division outer cylinder (first outer cylinder) 2A, and one expansion / contraction division. The step of fixing the first side cover member 3 provided to extend inward in the radial direction of one of the stretchable split outer cylinders 2A at the end opposite to the wall surface 11 of the outer cylinder 2A, and the extension of the pipe 10 Covering the outer periphery of the pipe 10 closest to the wall surface 11 with the other telescopic split outer tube (second outer tube) 2B provided so as to be movable relative to one telescopic split outer tube 2A in the direction, and the other telescopic A step of fixing a second side cover member 4 provided to extend radially outward of the other stretchable split outer tube 2B at an end of the split outer tube 2B facing the wall surface 11, and one stretchable split outer tube After fixing 2A to the pipe 10 side, the other stretchable split outer tube 2B is replaced with one stretchable split outer tube. A step of adjusting the gap β with respect to the wall surface 11 of the second side lid member 4 by moving with respect to A, and fixing the other telescopic divided outer cylinder 2B to the pipe 10 side and one telescopic divided outer cylinder 2A. .

  According to this piping protection method, the setting of the clearance α with respect to the outer peripheral surface of the piping 10 at the inner end 3 b of the first side lid member 3 and the adjustment of the clearance β with respect to the wall surface 11 of the second side lid member 4 are performed independently. Since it performs, the attachment to the piping 10 can be easily performed in the part which penetrated the wall surface 11 of the piping 10. FIG.

  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 sends it through the pipe 10 (secondary cooling water pipes 106a, 106b, the primary cooling water pipe 105, etc.) and uses the fluid. In the nuclear equipment, it is preferable that the pipe protection device 1 described above is applied to the pipe 10.

  According to this nuclear power facility, the pipe protection device 1 prevents the fluid ejected from the pipe 10 from affecting the internal structures and equipment around the pipe 10 and protects the structure and equipment. Can do. For this reason, it is not necessary to install the jet barrier which interrupts the fluid which ejected from the piping 10 in the structure in an installation, and the effect | action of a big load can be eliminated on the structure side. Furthermore, by suppressing the ejection of fluid around the pipe 10, there is no need for partitioning for physically separating the pipe 10 and safety-important equipment, and this affects the building shape of the equipment. Can be prevented.

  In addition, in each embodiment mentioned above, although application of the piping protection apparatus 1 is illustrated as a straight pipe part of the piping 10, the piping protection apparatus 1 is applicable also to the curved part of the piping 10. FIG. In this case, the extending direction of the pipe 10 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 shown in the figure, it may be a nuclear facility using a boiling water reactor (BWR). The present invention can also be applied to piping that passes through.

1 piping protection device 2 outer cylinder 2A expansion / contraction split outer cylinder (first outer cylinder)
2B Telescopic split outer cylinder (second outer cylinder)
3 First side cover member 3b Inner end 4 Second side cover member 4b Outer surface 10 Piping 11 Wall surface

Claims (5)

An outer cylinder that covers the outer periphery of the part that penetrates the wall surface of the pipe through which the fluid flows;
The wall surface of the outer cylinder has an inner diameter that is larger than the outer diameter of the pipe and smaller than the inner diameter of the outer cylinder, and has an outer diameter that is equal to or larger than the outer diameter of the outer cylinder. The outer cylinder is radially inward so as to reduce the distance between the inner surface side of the outer cylinder and the outer surface side of the pipe while being fixed to the opposite end and continuing in the circumferential direction of the outer cylinder. A first side cover member provided to extend;
The pipe has an inner diameter that is larger than the outer diameter of the pipe and equal to the inner diameter of the outer cylinder, and has an outer diameter larger than the outer diameter of the outer cylinder. A second side lid member that is fixed to an end on the facing side and is provided to extend outward in the radial direction of the outer cylinder while continuing in the circumferential direction of the outer cylinder;
A piping protection device comprising: The pipe protection device according to claim 1, wherein the second side lid member is disposed with a gap with respect to the wall surface. 3. The piping protection according to claim 2 , wherein the outer cylinder is provided in such a manner as to adjust a gap with respect to the wall surface of the second side cover member, and the end portions are divided so as to be close to or separable. apparatus. A step of covering the outer periphery of the part penetrating the wall surface in the pipe through which the fluid flows with the first outer cylinder;
A first side lid member provided at the end of the first outer cylinder opposite to the wall surface and extending radially inward of the first outer cylinder while continuing in the circumferential direction of the first outer cylinder; Fixing, and
A step of covering an outer periphery of the pipe that is closest to the wall surface by a second outer cylinder that is provided to be movable relative to the first outer cylinder in the extending direction of the pipe;
A second side cover member provided to extend radially outward of the second outer cylinder while being continuous in the circumferential direction of the second outer cylinder is fixed to an end portion of the second outer cylinder facing the wall surface. And a process of
After fixing the first outer cylinder to the pipe side, the second outer cylinder is moved with respect to the first outer cylinder to adjust a gap with respect to the wall surface of the second side lid member, and the second outer cylinder Fixing the cylinder to the pipe side and the first outer cylinder;
Piping protection method characterized by including. A nuclear facility that generates a high-temperature and high-pressure fluid by heat generated in a nuclear reactor and sends it through piping, and uses the fluid.
A nuclear power facility, wherein the piping protection device according to any one of claims 1 to 3 is applied to the piping.

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