JP6274776B2 - Piping protection device and nuclear facility - Google Patents

Description

  The present invention is applied to, for example, a pipe protection device that suppresses the flow of fluid around the pipe and the progress of the pipe breakage when the pipe through which a high-temperature and high-pressure fluid passes is broken. 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 nuclear power installation which can suppress the progress of the ejection of the fluid around piping, and the fracture | rupture of piping.

  In order to achieve the above-described object, a pipe protection device according to the present invention is provided on an outer cylinder that covers an outer periphery of a predetermined portion of a pipe through which a fluid flows, a protrusion fixed to the pipe, and the outer cylinder. A through hole through which the protrusion is inserted, and a lid member that closes the through hole.

  According to this pipe protection device, when the pipe breaks, the outer cylinder covers the outer circumference of the pipe. Therefore, the fluid ejected from the broken part of the pipe is blocked by the outer cylinder. Spout can be suppressed. In addition, by providing a through-hole through which the projection fixed to the pipe is inserted in the outer cylinder, the projection and the through-hole are caught with each other. Can be suppressed. In addition, since the through hole is closed with the lid member, it is possible to prevent a situation in which fluid is ejected from the through hole. 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, it is not necessary to install a pipe whip or a jet barrier that blocks the fluid ejected from the pipe in the structure, and a large load can be eliminated from the structure. 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 side cover member provided along the outer periphery of the pipe at both ends of the outer cylinder and attached so as to close a gap between the both ends of the outer cylinder and the pipe is further provided. It is characterized by providing.

  According to this piping protection device, when the pipe is broken by the side lid member that closes the gap between the both ends of the outer cylinder and the pipe, the fluid ejected from the broken portion of the pipe is blocked at both ends of the outer cylinder. The effect which suppresses the ejection of the fluid around piping can be acquired notably.

  In the pipe protection device of the present invention, at least two of the protrusion and the through hole are provided along the extending direction of the pipe.

  When the pipe breaks, the pipe tends to be separated in the opposite direction from the fractured portion by the fluid jet force. Specifically, when the pipe is broken in the circumferential direction, the pipe tends to be separated in the direction opposite to the extending direction starting from the broken portion. According to the pipe protection device of the present invention, since at least two protrusions and through-holes that are hooked to each other are provided along the extending direction of the pipe, both the protruding parts are opposite to each other in the extending direction of the pipe. Even if it is going to leave in the direction to do, both through-holes will be caught in a projection part, respectively, and it will suppress that a projection part leaves | separates between an outer cylinder. For this reason, it is possible to prevent a situation in which the pipes are separated from each other in the opposite directions starting from the fractured portion and come off the outer cylinder.

  In the pipe protection device of the present invention, a fixing member for fixing the pipe is attached to the outer periphery of the pipe, the outer cylinder has an opening through which the fixing member is inserted, and an opening edge of the opening Is connected to a part of the fixing member.

  According to this pipe protection device, the outer cylinder is sealed, for example, by seal welding using a part of the fixing member while ensuring the connection between the pipe and the fixing member at a predetermined portion of the pipe fixed by the fixing member. Therefore, when the pipe breaks, the outer cylinder covers the outer periphery of the pipe, and the fluid ejected from the fractured portion of the pipe is blocked by the outer cylinder, so that the ejection of fluid around the pipe can be suppressed.

  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 a structure that can withstand the pipe whip and a jet barrier that blocks the fluid ejected from the pipe, and the action of a large 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.

  ADVANTAGE OF THE INVENTION According to this invention, the progress of the ejection of the fluid around piping and the fracture | rupture of piping can be suppressed.

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 sectional view in the pipe radial direction of the pipe protection device according to the first embodiment of the present invention. FIG. 4 is a 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 perspective view of a pipe protection device according to Embodiment 2 of the present invention. FIG. 6 is a cross-sectional view in the pipe radial direction of the pipe protection device according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view in the pipe extending direction of the pipe protection device 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 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 cross-sectional view in the pipe radial direction of the pipe protection device according to the present embodiment, and FIG. 4 is a pipe according to the present embodiment. It is sectional drawing of the piping extension direction of a protective device.

  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. 2 to 4, the pipe protection device 1 includes an outer cylinder 2, a protruding portion 3, a through hole 4, and a lid member 5.

  The outer cylinder 2 is provided in a pipe 10 through which a fluid flows, such as the secondary cooling water pipes 106a and 106b and the primary cooling water pipe 105 described above. The outer cylinder 2 covers the outer periphery of the predetermined portion as described above of the pipe 10, is formed in a cylindrical shape along the extending direction of the pipe 10, and a plurality of pipes (pipe in the drawing) are attached to the pipe 10. It is divided into two (10 in the radial direction) divided outer cylinders 2a. The outer cylinder 2 is attached to the pipe 10 by arranging each divided outer cylinder 2a so as to cover the outer periphery of the pipe 10 and welding the portion where each divided outer cylinder 2a is abutted. The outer cylinder 2 is formed of, for example, carbon steel that can maintain rigidity. 3 and 4, a gap is shown between the outer surface of the pipe 10 and the inner surface of the outer cylinder 2.

  As shown in FIG. 3, the protrusion 3 is fixed to the outer surface of the pipe 10 and protrudes from the outer peripheral surface of the pipe 10 in the radial direction. The protrusion 3 is formed in a rectangular column shape, and is fixed to the outer peripheral surface of the pipe 10 by welding. At least two protrusions 3 are provided along the extending direction of the pipe 10, and a plurality of protrusions 3 are provided in the radial direction of the pipe 10. In this embodiment, the extending direction of the pipe 10 as shown in FIG. 4 in total, two in the radial direction of the pipe 10 as shown in FIG. Moreover, the protrusion part 3 provided along the extension direction of the piping 10, and the protrusion part 3 provided in the radial direction of the pipe 10 are provided corresponding to the position where each division | segmentation outer cylinder 2a is attached. The protrusion 3 is not limited to a rectangular column shape, and may be formed in a prismatic shape or a cylindrical shape, for example. The protrusion 3 is formed of, for example, carbon steel that can maintain rigidity, or a metal material that can be welded to the pipe 10.

  As shown in FIG. 3, the through-hole 4 is provided in the outer cylinder 2 (each divided outer cylinder 2a). The through-hole 4 is provided at a position corresponding to the protruding portion 3 in a state where the outer cylinder 2 (each divided outer cylinder 2a) is attached to the pipe 10, and is formed to have a size through which the protruding portion 3 is inserted. Yes. In the present embodiment, the through hole 4 is formed in a rectangular shape so as to pass through the rectangular columnar protrusion 3. In a state where the outer cylinder 2 (each divided outer cylinder 2 a) is attached to the pipe 10, the protrusion 3 is inserted into the through hole 4. As shown in FIG. 3, the protruding portion 3 may penetrate the through hole 4 and protrude to the outside of the outer cylinder 2, but is inserted into the through hole 4 so as to be in contact with at least the inner surface of the through hole 4. That's fine.

  The lid member 5 closes the through hole 4. The lid member 5 has a shape that covers the through hole 4 and is formed so as to be in contact with the outer peripheral surface of the outer cylinder 2 that is the periphery of the through hole 4. The lid member 5 is attached to the outer cylinder 2 by welding so as to cover the through-hole 4 in a state where the outer cylinder 2 is attached to the pipe 10 and the protrusion 3 is inserted through the through-hole 4. At this time, the lid member 5 is attached by seal welding so as to seal between the through hole 4. The lid member 5 is formed of, for example, carbon steel that can maintain rigidity.

  As described above, the pipe protection device 1 of the present embodiment is provided on the outer cylinder 2 that covers the outer periphery of a predetermined portion of the pipe 10 through which the fluid flows, the protrusion 3 that is fixed to the pipe 10, and the outer cylinder 2. A through hole 4 through which the protrusion 3 is inserted, and a lid member 5 that closes the through hole 4.

  According to this pipe protection device 1, when the pipe 10 is broken, the outer cylinder 2 covers the outer periphery of the pipe 10, so that the fluid ejected from the broken portion of the pipe 10 is blocked by the outer cylinder 2. The ejection of the fluid around 10 can be suppressed. Moreover, by providing the outer cylinder 2 with the through-hole 4 through which the protrusion 3 fixed to the pipe 10 is inserted, the protrusion 3 and the through-hole 4 are caught with each other, thereby preventing the pipe whip from swinging around the broken pipe 10. In addition, the progress of fracture can be suppressed. In addition, since the through hole 4 is closed by the lid member 5, it is possible to prevent a situation where fluid is ejected from the through hole 4. 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 pipe whip or a jet barrier that blocks the fluid ejected from the pipe in the structure, and a large load can be eliminated from the structure. 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.

  Further, in the pipe protection device 1 of the present embodiment, as shown in FIGS. 2 to 4, the outer cylinder 2 is provided at both ends along the outer periphery of the pipe 10, and the gap between the both ends of the outer cylinder 2 and the pipe 10 is provided. It is preferable to further include a side cover member 6 for closing the cover.

  The side lid member 6 is formed in an annular shape, and is divided into a plurality of (two in the radial direction of the pipe 10 in the figure) divided side lid members 6a for attachment to the pipe 10 in the same manner as the outer cylinder 2. Is formed. The side lid member 6 is arranged such that each divided side lid member 6a is in contact with the outer peripheral surface of the pipe 10 with the inner end 6b in contact with each divided side lid member 6a, and the outer side of each divided side lid member 6a. The portions that are in contact with the cylinder 2 are attached to the pipe 10 together with the outer cylinder 2 by welding. At this time, the side cover member 6 is attached by seal welding so as to seal between the outer cylinder 2. Further, the side lid member 6 is not welded to the pipe 10. The side lid member 6 is formed of, for example, carbon steel that can maintain rigidity. In this way, the side cover member 6 is attached so as to close the gap between the both ends of the outer cylinder 2 and the pipe 10.

  According to the pipe protection device 1, when the pipe 10 is broken by the side lid member 6 that closes the gap between the both ends of the outer cylinder 2 and the pipe 10, the pipe 10 is ejected from the broken portion of the pipe 10 at both ends of the outer cylinder 2. Since the fluid is blocked, the effect of suppressing the ejection of the fluid around the pipe 10 can be remarkably obtained.

  Further, in the pipe protection device 1 of the present embodiment, it is preferable that at least two protrusions 3 and through holes 4 are provided along the extending direction of the pipe 10 as described above.

  When the pipe 10 is broken, the pipe 10 tends to be separated in the opposite direction from the broken portion as a starting point due to the jet power of the fluid. Specifically, when fractured in the circumferential direction, the pipe 10 tends to leave in the opposite direction of the extending direction starting from the fractured portion. According to the pipe protection device 1 of the present embodiment, at least two protrusions 3 and through holes 4 that are hooked to each other are provided along the direction in which the pipe 10 extends. Even if the pipes 10 are separated in the direction opposite to the extending direction of the pipe 10, both the through holes 4 are caught by the projections 3, and the projections 3 are prevented from separating between the outer cylinders 2. For this reason, it is possible to prevent the pipe 10 from separating from the opposite direction starting from the fractured portion and coming out of the outer cylinder 2. In addition, when the pipe 10 is broken and the pipe 10 is separated in the opposite direction from the broken portion due to the jetting force of the fluid, the reaction force of the fluid jet acts on each of the separated pipes, resulting in a pipe whip. However, according to the pipe protection device 1 of the present embodiment, a structure capable of withstanding the pipe whip is not required in order to prevent the pipe whip. In order to obtain the above effect remarkably, it is preferable that the at least two protrusions 3 and the through hole 4 are arranged in the vicinity of both ends of the outer cylinder 2.

  In addition, 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 the fluid through the pipe 10 (secondary cooling water pipes 106a and 106b, the primary cooling water pipe 105, etc.) In the nuclear equipment to be used, 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 a structure that can withstand the pipe whip and a jet barrier that blocks the fluid ejected from the pipe 10 in the in-facility 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. 5 is a perspective view of the pipe protection device according to the present embodiment, FIG. 6 is a cross-sectional view in the pipe radial direction of the pipe protection device according to the present embodiment, and FIG. 7 is a pipe according to the present embodiment. It is sectional drawing of the piping extension direction of a protective device. The pipe protection device 1 of the present embodiment is different from the pipe protection device 1 of the first embodiment described above in that the pipe 10 is fixed to the fixing member 11, and other configurations related to the fixing member 11 are different. Is 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.

  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 provided in a pipe 10 through which a fluid flows, such as the secondary cooling water pipes 106a and 106b and the primary cooling water pipe 105, in a nuclear facility. Specifically, the pipe protection device 1 is provided at a weld connection portion at a pipe fixing point in a nuclear facility. The pipe fixing point is a portion having the fixing member 11.

  The fixing member 11 includes a base 11A provided on the fixing side for fixing the pipe 10, a support column 11B extending from the base 11A toward the side of the pipe 10, and the support column 11B and the pipe 10. It includes a connecting member 11C to be connected and a connecting member 11D for connecting the support column 11B to the base 11A and the connecting member 11C.

  11 A of bases are formed in plate shape, and are fixed to the member which has the rigidity in an installation. The support column 11B is formed in a columnar shape, and is formed in a columnar shape in the present embodiment. The support pillar 11B is not limited to a cylindrical shape, and may be a prism. The extending direction of the support pillar 11B is a direction intersecting with the extending direction of the pipe 10 and is preferably orthogonal to the extending direction of the pipe 10 in order to stably support the pipe 10. The connecting member 11C is formed along the shape of the lower half portion of the pipe 10, and is a member having a shape in which the cylinder is halved. The inner surface of the connecting member 11 </ b> C is formed along the outer surface shape of the pipe 10, and the outer surface of the connecting member 11 </ b> C is formed along the inner surface shape of the outer cylinder 2. That is, the connecting member 11 </ b> C has a shape of a part of a cylinder and is formed to be interposed between the pipe 10 and the outer cylinder 2. The outer edge of the connecting member 11C is connected to the pipe 10 by welding. In this way, the support column 11B and the pipe 10 are connected by the connection member 11C. The connecting member 11D is a plate material that extends around the support column 11B along the extending direction of the support column 11B. In this embodiment, the connecting member 11D is provided in each of four directions (every 90 degrees) around the support column 11B. The connecting member 11D is connected to the outer surface of the support column 11B, the upper surface of the base 11A, and the outer surface of the connecting member 11C by welding. By connecting the outer surface of the support column 11B, the upper surface of the base 11A, and the outer surface of the connection member 11C to each other by the connecting member 11D, the connection between the support column 11B and the base 11A, and the support column 11B and the connection member 11C. The strength can be maintained.

  In contrast to the pipe 10 having such a fixing member 11, in the pipe protection device 1 of the present embodiment, the outer cylinder 2 has an opening 7 through which the support column 11 </ b> B of the fixing member 11 and the connecting member 11 </ b> D are inserted. . The opening 7 is formed to be smaller than the size of the outer surface of the connection member 11C. The opening edge of the opening 7 is connected to the outer surface of the connecting member 11C by seal welding.

  Thus, in the pipe protection device 1 of the present embodiment, the fixing member 11 that fixes the pipe 10 is attached to the outer periphery of the pipe 10, and the outer cylinder 2 has the opening 7 through which the fixing member 11 is inserted. The opening edge of the opening 7 is connected to a part of the fixing member 11 by seal welding.

  According to the pipe protection device 1, the same effect as that of the first embodiment described above can be obtained, and the pipe 10 and the fixing member 11 can be connected at a predetermined portion of the pipe 10 fixed by the fixing member 11. Since the outer cylinder 2 is sealed and welded using a part of the fixing member 11 while guaranteeing, when the pipe 10 is broken, the outer cylinder 2 covers the outer periphery of the pipe 10 and ejects from the broken portion of the pipe 10. Since the fluid to be dammed is dammed by the outer cylinder 2, the ejection of fluid around the pipe 10 can be suppressed. In addition, in order to suppress the ejection of the fluid around the pipe 10 by the pipe protection device 1 and to receive the reaction force of the fluid ejection by the pipe protection device 1, the function of receiving the reaction force of the fluid ejection is added to the fixing member 11 Can eliminate the need to do.

  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 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 Protrusion part 4 Through-hole 5 Lid member 6 Side lid member 6b Inner end 7 Opening part 10 Piping 11 Fixing member

Claims (4)

An outer cylinder covering the outer periphery of a predetermined part of the pipe through which the fluid flows;
A protrusion fixed to the pipe;
A through hole provided in the outer cylinder and passing through the protruding portion;
A lid member for closing the through hole;
Provided along the outer periphery of the pipe at both ends of the outer cylinder, and attached to the outer cylinder by seal welding so as to close the gap between the both ends of the outer cylinder and the pipe, A side cover member that is in contact with the outer peripheral surface of the pipe and is not welded;
A piping protection device comprising: The pipe protection device according to claim 1, wherein at least two of the protrusion and the through hole are provided along an extending direction of the pipe. A fixing member for fixing the pipe is attached to the outer periphery of the pipe, the outer cylinder has an opening through which the fixing member is inserted, and an opening edge of the opening is connected to a part of the fixing member. The piping protection device according to claim 1 or 2 , wherein 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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