JP2018004433A - Vent device with filter and method of disposing thermal insulation material around vent device with filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vent device with a filter capable of reducing a time required for installing a support member of a thermal insulation material and attaching the thermal insulation material.SOLUTION: A vent device with filter includes a vessel and a thermal insulation material support body 14 that surround the vessel. The thermal insulation material support body 14 includes a lower support body 14A, an intermediate support body 14B, and an upper support body 14C that are formed into a unit. The lower support body 14A includes a corridor 23A that surrounds the vessel and a plurality of support members 21A positioned around the vessel. The corridor 23A is attached to the support members 21A. The intermediate support body 14B includes two corridors 23B that surround the vessel. The corridors 23B are attached to an upper end of each support member 21A and attached to the plurality of support members 21B positioned around the vessel. The upper support body 14C includes a corridor 23C that surrounds the vessel. The corridor 23C is attached to upper ends of the support members 21B and attached to the plurality of support members 21A positioned around the vessel. A plurality of thermal insulation panels 32 are disposed around the vessel and attached to the support members 21A to 21C.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vent device with a filter and a method of arranging a heat insulating material around the device, and more particularly, to a vent device with a filter suitable for application to a boiling water nuclear power plant and a heat insulating material around the device. It relates to the arrangement method.

  In a nuclear power plant such as a boiling water nuclear power plant (hereinafter referred to as a BWR plant) and a pressurized water nuclear power plant (hereinafter referred to as a PWR plant), the nuclear reactor is disposed in the reactor containment vessel, Surrounded by. The containment vessel is highly airtight and plays a role in preventing radioactive materials from diffusing outside. In a nuclear reactor, a reactor core loaded with a plurality of fuel assemblies is disposed in a reactor pressure vessel.

  When a severe accident occurs in a nuclear power plant, steam containing radioactive material is released from the reactor pressure vessel into the space inside the reactor containment vessel, and the pressure in the space inside the reactor containment vessel rises. In order to prevent damage to the reactor containment vessel due to this pressure increase, a vent device with a filter is connected to the reactor containment vessel as described in JP-A-2015-45518. A vent device with a filter is installed outside a reactor building that houses a reactor containment vessel, a container filled with water inside, a gas ejection device having a number of nozzles arranged in a water region inside the vessel, and A filter is provided in the container above the water region. An introduction pipe communicated with the gas ejection device reaches the outside of the vessel above the water region and is connected to the reactor containment vessel.

  When steam containing radioactive material is released from the reactor into the space inside the containment vessel due to the occurrence of a severe accident, the steam is guided to a vent device with a filter. Vapor containing vapor (condensable gas) containing radioactive material and atmospheric gas (non-condensable gas) originally present in the reactor containment vessel, released from the space inside the reactor containment vessel, is used as a vent gas. Through to the gas blower. And this vent gas is injected into the water area | region in a container from many nozzles provided in the gas ejection apparatus. Vapor contained in the vent gas is condensed in the water region, and radioactive substances such as radioactive iodine dissolved in water are also removed in the water region. Vent gas containing radioactive material that has not been removed and non-condensable gas reaches the filter, where the remaining radioactive material is removed. The vent gas that has passed through the filter is exhausted to the outside environment.

  In the construction of a plant, it is often performed using an assembled scaffold. Japanese Patent Application Laid-Open No. 2004-170319 also uses a scaffold to construct a main steam pipe chamber of a nuclear power plant. Using the assembled scaffold, install the wall rebar and column rebar of the main steam pipe chamber, the wall rebar frame and the column rebar frame, and around the wall rebar and wall rebar frame, and the column rebar and column rebar. Formwork will be installed around each frame. Concrete is cast into each formwork, and after the concrete has hardened, the formwork is removed. The modular main steam chamber unit is placed on the constructed wall and column, and the scaffold is further stacked to construct the wall and column of the main steam chamber unit.

JP2015-45518A JP 2004-170319 A

  The vent device with a filter is installed in another auxiliary building installed outside the reactor building. After the vent device with filter is installed in the auxiliary building, it is necessary to install a heat insulating material around the vent device with filter. For the installation of the heat insulating material, a scaffold is used as described in JP-A-2004-170319. The scaffold is installed so as to surround the vent device with filter between the installed vent device with filter and the inner surface of the side wall of the auxiliary building.

  The heat insulating material support member is suspended by a crane from above the auxiliary building between the vent device with a filter and the installed scaffolding and installed on the floor of the auxiliary building. A plurality of heat insulating material support members are installed surrounding the vent device with a filter. After these heat insulating material support members are installed, the worker attaches the metal heat insulating material to these heat insulating material support members so as to surround the vent device with a filter by using a scaffold. After the metal insulation is installed, the scaffold is dismantled and removed.

  Thus, in the work of installing the heat insulating material support member and attaching the heat insulating material using the scaffold, the work of installing the scaffold and the work of disassembling and removing the scaffold are required, and the time required for the work becomes long. For this reason, shortening of the time required for the operation | work of installation of a heat insulating material support member and attachment of a heat insulating material is desired.

  The objective of this invention is providing the vent apparatus with a filter which can shorten the time which installation of a heat insulating material support member and heat insulating material attachment require, and the arrangement | positioning method of the heat insulating material to the circumference | surroundings of the apparatus.

A feature of the present invention that achieves the above-described object includes a container in which a gas ejection device and a filter disposed above the gas ejection device are respectively installed, and a heat insulating material support that surrounds the container,
A plurality of first support members arranged around the container, a first walkway attached to the plurality of first support members around the container, and an upper end of each of the plurality of first support members. A plurality of second support members attached and disposed surrounding the container, and a second walkway surrounding the container and attached to the plurality of second support members;
A plurality of heat insulating material panels are provided so as to surround the container and are attached to the heat insulating material support.

  The attachment of the second support member to the upper end of the first support member and the attachment of the second corridor to the plurality of second support members can be performed using the first corridor, and are arranged surrounding the container. Since each heat insulating material panel can be attached to the heat insulating material support using the first walkway and the second walkway, the installation work of the scaffold and the dismantling work of the scaffold become unnecessary, and the heat insulating material support member It is possible to shorten the time required for the installation and the heat insulating material attachment.

The above-described object is to arrange a plurality of first support members so as to surround a container installed in an auxiliary building by installing a gas ejection device and a filter disposed above the gas ejection device. And install it on the floor of the auxiliary building,
The first walkway surrounding the container is attached to the plurality of first support members installed in the auxiliary building,
A plurality of second support members are disposed surrounding the container in the auxiliary building, and attached to the upper ends of the plurality of first support members using the first walkway,
A second gallery surrounding the container is attached to a plurality of second support members attached to each of the first support members in the auxiliary building using the first gallery,
A plurality of vents with a filter are arranged around the container and attached to each of the plurality of first support members and the plurality of second support members using the first and second walkways. This can also be achieved by a method of arranging the heat insulating material around the apparatus.

The above-described object is to provide a modular first support member having a plurality of first support members arranged in a ring shape at intervals, and a ring-shaped first corridor attached to the first support members. Bring your body into the auxiliary building,
A plurality of first support members are disposed around a container that is installed in the auxiliary building by installing a gas jetting device and a filter disposed above the gas jetting device inside the first support body that is carried in. And installed on the floor of the auxiliary building so that the first walkway is located,
A second support member modularized by having a plurality of second support members arranged in a ring shape at intervals and a ring-shaped second corridor attached to these second support members is provided as an auxiliary building. Carry it indoors,
The carried second support is mounted on the first support so that a plurality of second support members and second walkways are arranged around the container,
A plurality of heat insulation panels are arranged around the container, and each of the first walkway and the second walkway is used to access the surroundings of the vent device with a filter attached to each of the first support body and the second support body. This can also be achieved by the heat insulating material arrangement method.

  ADVANTAGE OF THE INVENTION According to this invention, the time required for installation of a heat insulating material support member and heat insulating material attachment can be shortened.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the boiling water nuclear power plant provided with the vent apparatus with a filter of Example 1 which is one suitable Example of this invention. It is an external view of the heat insulating material support body which completed the attachment of the heat insulating material arrange | positioned around the vent apparatus with a filter shown by FIG. It is a detailed block diagram of the lower support body of the heat insulating material support body arrange | positioned around the vent apparatus with a filter shown by FIG. It is a detailed block diagram of the intermediate support body of the heat insulating material support body arrange | positioned around the vent apparatus with a filter shown by FIG. It is a detailed block diagram of the upper support body of the heat insulating material support body arrange | positioned around the vent apparatus with a filter shown by FIG. It is explanatory drawing which shows the installation procedure of the heat insulating material support body arrange | positioned around the vent apparatus with a filter shown by FIG.

  Examples of the present invention will be described below.

  A vent device with a filter according to a first embodiment which is a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The BWR plant 1 provided with the vent device 4 with a filter of the present embodiment will be described. The BWR plant 1 includes a reactor containment vessel 2 that surrounds a nuclear reactor (not shown), and a vent device 4 with a filter. Although not shown, the nuclear reactor includes a nuclear reactor pressure vessel and a reactor core disposed in the reactor pressure vessel and loaded with a plurality of fuel assemblies. The reactor containment vessel 2 is accommodated in the reactor building 3. The reactor containment vessel 2 is highly airtight, and prevents radioactive material from diffusing outside when the radioactive material leaks from the reactor due to an accident. The vent device 4 with a filter is connected to the reactor containment vessel 2 by a connection pipe 17. Further, the vent device 4 with a filter is connected to an exhaust cylinder 19 by an exhaust pipe 18.

  The vent device with filter 4 includes a container 5, an introduction pipe 6, a filter 10, a heat insulating material support 14, and a gas ejection device 33. The container 5 of the vent device with a filter 4 is disposed in an internal space 16C of an auxiliary building 16 that is built outside the reactor building 3 and separately from the reactor building 3, and is a base platform formed on the floor 16B of the auxiliary building 16. 37 (see FIG. 2). Reference numeral 20 denotes the ground, and the auxiliary building 16 that houses the vent device 4 with a filter is provided in the ground.

  Water 34 is filled in the container 5 and exists in the lower part of the container 5. One end of the introduction pipe 6 is attached to the bottom surface of the container 5 at the position of the central axis of the container 5, extends upward from the bottom surface of the container 5 along the central axis, and reaches above the water surface of the water 34. The introduction pipe 6 is bent in a horizontal direction at a certain position above the water surface, extends toward the side wall of the container 5, passes through the side wall, and reaches the outside of the container 5. Such an introduction pipe 6 is connected to the connection pipe 17 outside the container 5. A gas ejection device 33 is disposed in water within the container 5 and is disposed around the introduction pipe 6. As described in Japanese Patent Application Laid-Open No. 2015-45518, the gas ejection device 33 has a large number of nozzles 8 that eject vent gas upward. These nozzles 8 are arranged along a plurality of concentric circles surrounding the introduction pipe 6, and are arranged at equal intervals along each concentric circle. The gas ejection device 33 has a gas passage 7 communicating with the introduction pipe 6 and each nozzle 8 inside.

  A ring-shaped support plate 35 is disposed in the container 5 above the water surface of the water 34 and the introduction pipe 6, and is attached to the inner surface of the container 5. A cylindrical member 9 that divides the inside of the container 5 into a central passage 11 and an annular peripheral passage 36 is disposed on the support plate 35 and attached to the support plate 35. An annular filter 10 is attached to the upper end of the cylindrical member 9 in the container 5. The exhaust pipe 18 is connected to the side wall of the container 5 and communicates with the peripheral passage 36.

  An outline of functions of the vent device 4 with a filter will be described. When a severe accident occurs in the BWR plant 1, steam containing radioactive material is released from the reactor into the space inside the reactor containment vessel, and the pressure in this space increases. Steam (condensable gas) containing radioactive material released into the space inside the reactor containment vessel and atmospheric gas (for example, non-condensable gas, which is nitrogen gas) originally present in the reactor containment vessel are vent gases. As described above, the gas is blown to the gas ejection device 33 through the connection pipe 17 and the introduction pipe 6. The temperature of the vent gas led to the gas ejection device 33 is about 180 ° C. The vent gas that has flowed into the gas passage 7 formed inside the gas ejection device 33 from the introduction pipe 6 is discharged into the water 34 from the multiple nozzles 8 of the gas ejection device 33. Vapor contained in the vent gas is condensed by the water 34, and radioactive substances such as radioactive iodine dissolved in the water are also removed by the water 34. The vent gas including the radioactive material and the non-condensable gas that has not been removed reaches the central passage 11 from the water 34, rises in the central passage 11, and flows into the filter 10 through the region 12 inside the filter 10. Here, the remaining radioactive material is removed by the filter 10.

  The auxiliary building 16 is made of reinforced concrete and has a function of shielding radiation emitted from the vent device 4 with the filter after the vent gas is introduced into the vent device 4 with the filter.

  The vent gas (substantially condensable gas) from which the radioactive material has been removed is released from the filter 10 into an annular region 13 formed around the filter 10 in the container 5. The vent gas descends from the region 13 and flows into the peripheral passage 36 and is discharged to the exhaust pipe 18. The vent gas from which the vapor and radioactive material have been removed is exhausted from the exhaust pipe 19 through the exhaust pipe 18 to the outside.

  Next, the detailed structure of the heat insulating material support 14 will be described with reference to FIGS. The heat insulating material support 14 is disposed between the vent device 4 with a filter installed in the auxiliary building 16 and the inner surface of the side wall 16A of the auxiliary building 16, and is installed on a foundation base 37 formed on the floor 16B ( FIG. 1 and FIG. 2). The heat insulating material support 14 is configured by combining a lower support 14A (see FIG. 3), an intermediate support 14B (see FIG. 4), and an upper support 14C (see FIG. 5). Each of the lower support 14A, the intermediate support 14B, and the upper support 14C is modularized. In the heat insulating material support 14, the lower support 14A is disposed at the lowermost position, the upper support 14C is disposed at the uppermost position, and the intermediate support 14B is disposed between the lower support 14A and the upper support 14C.

  The lower support 14A includes a plurality of (for example, eight) long support members 21A and a walkway 23A that are disposed so as to surround the container 5 of the vent device 4 with a filter. These support members 21 </ b> A extend upward in the axial direction of the container 5, and are arranged in a ring shape around the container 5 at equal intervals. Adjacent support members 21A are connected by connecting members 22A that are arc-shaped and extend in the horizontal direction. In this way, the support members 21A arranged around the container 5 are connected to each other by the connection member 22A. A connection plate 30A is attached to the upper end of each support member 21A. The walkway 23A is formed so as to surround the periphery of the container 5, and is attached to each support member 21A. The walkway 23A includes a ring-shaped floor board 24A and a handrail 25A. The floor plate 24A is attached to each support member 21A and attached to a support bar 31A that extends in the horizontal direction toward the outside. The handrail 25A is attached to the floor plate 24A and extends upward from the floor plate 24A. The lower end of each support member 21 </ b> A of the lower support 14 </ b> A is installed on the base stand 37.

  The intermediate support 14B has a plurality of (e.g., eight) long support members 21B and two corridors 23B disposed so as to surround the container 5 of the vent device 4 with a filter. These support members 21 </ b> B extend upward in the axial direction of the container 5, and are arranged in a ring shape around the container 5 at equal intervals. Adjacent support members 21B are connected by connecting members 22B that are arc-shaped and extend in the horizontal direction. In this way, the support members 21B arranged around the container 5 are connected to each other by the connecting members 22B at two different positions in the axial direction of the container 5. The connection plate 30B is attached to the lower end of each support member 21B, and the connection plate 30C is attached to the upper end of each support member 21A. The connection plate 30B attached to each support member 21B is attached to the connection plate 30A attached to the upper end of each support member 21A of the lower support 14A.

  Two walkways 23 </ b> B are formed so as to surround the periphery of the container 5, and are attached to the respective support members 21 </ b> B at two different positions in the axial direction of the container 5. Each walkway 23B includes a ring-shaped floor board 24B and a handrail 25B. The floor plate 24B of one walkway 23B is attached to a support bar 31B that is attached to each support member 21B and extends in the horizontal direction toward the outside. The handrail 25B is attached to the floor plate 24B and extends upward from the floor plate 24B. The floor plate 24B of the other walkway 23B is attached to each support member 21B at a position above the above-described support bar 31B, and is attached to the other support bar 31B extending in the horizontal direction toward the outside. The handrail 25B of the other walkway 23B is attached to the floor plate 24B of the other walkway 23B and extends upward from the floor plate 24B.

  The upper support 14C includes a plurality of (for example, eight) long support members 21C, a plurality of (for example, eight) long support members 21D, which are disposed so as to surround the container 5 of the vent device 4 with a filter. It has a walkway 23C. These support members 21 </ b> C extend upward in the axial direction of the container 5, and are arranged in a ring shape around the container 5 at equal intervals. Adjacent support members 21 </ b> C are connected by connecting members 22 </ b> C that are arc-shaped and extend in the horizontal direction. In this way, the respective support members 21 </ b> C arranged around the container 5 are connected to each other by the connecting members 22 </ b> C at two different positions in the axial direction of the container 5. The connection plate 30D is attached to the lower end of each support member 21C. The connection plate 30D is attached to the connection plate 30C attached to the upper end of each support member 21B of the intermediate support 14B. These support members 21 </ b> D are attached to the upper ends of the respective support members 21 </ b> C and are arranged to be inclined toward the central axis of the container 5. Those supporting members 21 </ b> D are also arranged at equal intervals around the container 5. Each support member 21 </ b> D is connected to each other by a connection member 22 </ b> D at two different positions in the axial direction of the container 5. A cover member 26 is disposed at the upper end of the upper support 14C, and the cover member 26 is attached to the uppermost connection member 22D.

  One walkway 23C is formed so as to surround the periphery of the container 5, and is attached to each support member 21C. The walkway 23C includes a ring-shaped floor board 24C and a handrail 25C. The floor plate 24C is attached to each support member 21C and attached to a support bar 31C extending in the horizontal direction toward the outside. The handrail 25C is attached to the floor plate 24C and extends upward from the floor plate 24C.

  The lower support 14A, the intermediate support 14B, and the upper support 14C are integrated by attaching the connection plate 30B to the connection plate 30A and further attaching the connection plate 30D to the connection plate 30C.

  A large number of heat insulating material panels 32 are arranged between the support members 21 </ b> A, 21 </ b> B, 21 </ b> C and 21 </ b> D and the container 5 of the vent device 4 with a filter, and surround the container 5. Each heat insulating material panel 32 facing each of the supporting members 21A, 21B, 21C and 21D is attached to the facing supporting member. Of the heat insulating material panels 32 not facing each of the support members 21A, 21B, 21C, and 21D, each heat insulating material panel 32 positioned at the lowermost position is disposed on the base stand 37, and the left and right are other heat insulating material panels. 32 (at least one of the heat insulating material panels 32 attached to the support member). Of the heat insulating material panels 32 that do not face the support members 21A, 21B, 21C, and 21D, the heat insulating material panels 32 that are positioned above the heat insulating material panel 32 that is positioned at the lowermost position are adjacent to each other in the vertical and horizontal directions. The other heat insulating material panel 32 (at least one of the left and right heat insulating panels 32 is held by the heat insulating material panel 32 attached to the support member). The plurality of heat insulating material panels 32 cover the upper end of the upper support 14C and are attached to the upper support 14C.

  Each heat insulating material panel 32 is installed on the heat insulating material support 14 after an on-site pressure test of the vent device 4 with the filter after the vent device 4 with the filter is installed. In addition, the heat insulating material panel 32 which exists in positions, such as a welding line and a nozzle nozzle nozzle which is the object of the inspection (ISI) in the container 5 of the vent apparatus 4 with a filter, has a detachable structure. In the portion where the pipe connected to the container 5 is located, the walkway is detachable. The width of each of the walkways 23A, 23B, and 23C, that is, the width between the support member 21A and the handrail 25A, the width between the support member 21B and the handrail 25B, and the width between the support member 21C and the handrail 25C Is about 60 cm so that can move.

  A method of arranging the heat insulating material around the vent device with filter for the vent device with filter 4 of this embodiment will be described below with reference to FIG.

  Each of the lower support 14 </ b> A, the intermediate support 14 </ b> B, and the upper support 14 </ b> C having the above-described structure is manufactured outside the auxiliary building 16. The vent device 4 with a filter is suspended by a wire 28 on a fishing balance 27 suspended from a traveling crane 29, and is carried into the space 16C in the auxiliary building 16 from above. By operating the traveling crane 29, the vent device 4 with the filter is lowered in the space 16C and placed on the foundation table 37 formed on the floor 16B. The vent device 4 with a filter is installed on the foundation table 37.

  Thereafter, the lower support 14 </ b> A is suspended by the wire 28 on the fishing balance 27 suspended from the traveling crane 29 outside the auxiliary building 16 and lifted upward. When the lower support body 14A reaches above the upper end of the side wall 16A of the auxiliary building 16, the lower support body 14A lifted by operating the traveling crane 29 and above the upper end of the side wall 16A It moves in the horizontal direction until it is located directly above the annular space 16C between the inner surface of the side wall 16A. Then, by operating the traveling crane 29, the fishing balance 27 is lowered, and the lower support 14A is lowered toward the base 37 in the space 16C (see FIG. 6A). When the lower end of each support member 21A of the lower support 14A comes into contact with the upper surface of the base 37, the lowering of the lower support 14A is stopped. Each support member 21A is positioned at a predetermined position, and each support member 21A is installed on the base 37 (see FIG. 6B). At this time, each support member 21A of the lower support 14A to which the walkway 23A is attached is arranged so as to surround the container.

  The intermediate support 14 </ b> B is suspended from a fishing balance 27 suspended from the traveling crane 29 by a wire 28 outside the auxiliary building 16 and lifted upward. When the intermediate support body 14B reaches above the upper end of the side wall 16A, the traveling crane 29 is operated, and the intermediate support body 14B lifted is above the upper end of the side wall 16A, and the inner surfaces of the container 5 and the side wall 16A. Until it is located directly above the annular space 16C. Then, by operating the traveling crane 29, the fishing balance 27 is lowered and the intermediate support 14B is lowered toward the base 37 in the space 16C (see FIG. 6B). When the connection plate 30B provided at the lower end of each support member 21B of the intermediate support 14B comes into contact with the connection plate 30A provided at the upper end of each support member 21A of the lower support 14A installed on the base 37 The lowering of the intermediate support 14B is stopped. Each support member 21B is positioned at a predetermined position, and the connection plate 30B of each support member 21B is separately attached to the connection plate 30A of each support member 21A (see FIG. 6C). Thus, by attaching the connection plate 30B to the connection plate 30A, the intermediate support 14B is coupled to the lower support 14A. At this time, each support member 21 </ b> B of the intermediate support 14 </ b> B to which the walkway 23 </ b> B is attached is disposed so as to surround the container 5.

  The upper support 14C is suspended from the auxiliary building 16 by a wire 28 on a fishing balance 27 suspended from a traveling crane 29 and lifted upward. When the upper support 14C reaches above the upper end of the side wall 16A, the traveling crane 29 is operated, and the intermediate support 14B that is lifted is above the upper end of the side wall 16A, and the inner surfaces of the container 5 and the side wall 16A. Until it is located directly above the annular space 16C. Then, by operating the traveling crane 29, the fishing balance 27 is lowered, and the upper support 14C is lowered toward the base 37 in the space 16C (see FIG. 6C). The connection plate 30D provided at the lower end of each support member 21C of the upper support 14C contacts the connection plate 30C provided at the upper end of each support member 21B of the intermediate support 14B installed on the lower support 14A. At that time, the lowering of the upper support 14C is stopped. Each support member 21C is positioned at a predetermined position, and the connection plate 30D of each support member 21C is separately attached to the connection plate 30C of each support member 21B. In this manner, the upper support 14C is coupled to the intermediate support 14B by attaching the connection plate 30D to the connection plate 30C. At this time, each support member 21 </ b> C and each support member 21 </ b> D of the upper support 14 </ b> C to which the walkway 23 </ b> C is attached are disposed so as to surround the container 5. A cover member 26 provided at the upper end of the upper support 14 </ b> C covers the top of the container 5.

  Thus, the installation of the heat insulating material support 14 is completed. After that, the operation of attaching the heat insulating material support 14 to each support member of the heat insulating material panel 32 is performed. Each heat insulating material panel 32 is sequentially suspended from the traveling lane 29 outside the auxiliary building 16 and lifted, and is carried into the space 16C in the auxiliary building 16 to be supported by the lower support 14A, the intermediate support 14B, and the upper support. The support member 21 </ b> A, 21 </ b> B, and 21 </ b> C of the body 14 </ b> C and the outer surface of the container 5 are lowered. Each heat insulating material panel 32 lowered between each support member and the outer surface of the container 5 surrounds the periphery of the container 5 by workers on the floor 16B and the floor plates of the walkways 23A, 23B and 23C. Sequentially, the container 5 is disposed upward from the base 37 around the container 5. Each heat insulating material panel 32 facing each of the support members 21A, 21B, 21C, and 21D is attached to the facing support member. Each heat insulating material panel 32 not facing each of the support members 21A, 21B, 21C and 21D is coupled to each other heat insulating material panel 32 adjacent to the left and right by a connector (not shown), and the container 5 Each other heat insulating material panel 32 adjacent in the axial direction is also coupled by a connector (not shown). These connectors are attached to the periphery of adjacent heat insulating material panels 32. The attachment of each heat insulating material panel 32 to the support members 21A, 21B, 21C and 21D, and the connection of the adjacent heat insulating material panels 32 by the connecting tool are on the floor 16B and the floor plates of the walkways 23A, 23B and 23C. Performed by each worker. The movement of the worker from the floor 16B to the floor plate 24A of the corridor 23A, and further the movement from the corridor 23A to the upper corridors 23B and 23C, is a staircase (not shown) provided between the floor 16B and the corridor 23A. And it is performed using the stairs provided between the walkways.

  After the installation of the vent device 4 with the filter in the auxiliary building 16 and the installation of the heat insulating material panel 32 on the heat insulating material support 14 of the vent device 4 with the filter are finished, the ceiling of the auxiliary building 16 is at the upper end of the side wall 16A. Installed. The heat insulating material panel 32 installed on the heat insulating material support 14 is configured so that when a high temperature vent gas is introduced from the reactor containment vessel 2 to the vent device with a filter 4 when a severe accident occurs, Is transmitted to the auxiliary building 16. Thereby, even when a severe accident occurs, the soundness of the auxiliary building 16 can be maintained.

  According to the present embodiment, the heat insulating material support body 14 surrounding the container 5 and installed on the floor 16B has a plurality of support members 21 (specifically, the support members 21A, 21A, 21B and 21C) are provided with the corridor 23 (specifically, the corridors 23A, 23B, and 23C), and thus the worker uses the corridor 23 to connect a plurality of support members 21 that extend in the axial direction to each other (support The member 21A and the support member 21B and the support member 21B and the support member 21C can be connected), and the worker can install the respective heat insulating material panels 32 on the heat insulating material support 14 using the walkway 23. it can.

  As described above, in this embodiment, the plurality of supporting members 21 and the plurality of heat insulating material panels 32 can be installed on the heat insulating material support 14 using the walkways 23A to 23C. The installation work of the scaffolding around the container 5 and the dismantling work of the scaffold become unnecessary, and the time required for the installation of the heat insulating material support member and the heat insulating material attachment can be shortened. In particular, the fact that the installation work of the scaffold and the work of disassembling the scaffold in a narrow area between the container 5 and the side wall 16A of the auxiliary building 16 are unnecessary contributes significantly to shortening the work time.

  Furthermore, incidental work performed in the auxiliary building 16 in connection with the installation of the vent device 4 with a filter (connection work of piping such as connection between the introduction pipe 6 and the connection pipe 17 and connection between the cup period 18 and the container 5. , Piping support installation work, electrical wiring work, etc.) can also be performed using the walkways 23A to 23C. For this reason, it is possible to shorten the time required to perform the incidental work.

  The walkways 23A to 23C can also be used when the worker conducts the inspection of the vent device 4 with the filter during the service period, and the scaffolding work and the scaffolding work can be performed in the auxiliary building 16 for the inspection during the service period. There is no need to perform the dismantling work, and the time required for the inspection during the service period can be remarkably shortened.

  Furthermore, in this embodiment, the heat insulating material support 14 is divided into three parts, for example, a lower support 14A, an intermediate support 14B, and an upper support 14C, and the respective supports are modularized. Since the intermediate support 14B and the upper support 14C are sequentially carried between the container 5 and the side wall 16A, the time required for installing the heat insulating material support 14 in the auxiliary building 16, that is, the support members 21A to 21D. In addition, the time required for installing the walkways 23A to 23C can be further shortened.

  In the present embodiment, the heat insulating material support 14 is constituted by three modularized supports of a lower support 14A, an intermediate support 14B, and an upper support 14C. Although the height of one module becomes a little high, it may be constituted by two modularized supports (including the support member 21 and the walkway 23) of the lower support and the upper support. Moreover, you may comprise the heat insulating material support body 14 by the four support bodies (including the support member 21 and the walkway 23) modularized.

  A vent device with a filter according to embodiment 2, which is another preferred embodiment of the present invention, will be described below.

  The vent device with filter 4 of the present embodiment is applied to the BWR plant 1 and connected to the connection pipe 17 connected to the reactor containment vessel 2 in the same manner as the vent device with filter 4 of the first embodiment. Connected to period 18. The vent device with filter 4 of the present embodiment has substantially the same configuration as the vent device with filter 4 of the first embodiment. The heat insulating material support 14 of the vent device 4 with the filter according to the present embodiment includes the lower support 14A, the intermediate support 14B, and the upper support 14C like the heat insulating material support 14 of the vent device 4 with the filter according to the first embodiment. Although it does not have, it has the supporting members 21A-21D and the walkways 23A-23C which comprise the heat insulating material support body 14 of the vent apparatus 4 with a filter of Example 1. FIG. This is because the heat insulating material support 14 used in this embodiment does not assemble the lower support 14A, the intermediate support 14B and the upper support 14C carried in by the traveling crane 29 in the auxiliary building 16, but the traveling crane. This is because the individual members of the supporting members 21A to 21D and the walkways 23A to 23C are carried into the auxiliary building 16 at 29, and are assembled in the auxiliary building 16 using these carried-in members.

  A method for arranging the heat insulating material around the vent device with filter for the vent device 4 with filter of the present embodiment will be described below.

  Similar to the first embodiment, the vent device 4 with the filter is carried into the space 16 </ b> C in the auxiliary building 16 by the traveling crane 29 and installed on the foundation 37. Then, the heat insulating material support body 14 surrounding the container 5 of the vent device 4 with a filter is installed on the base table 37. The installation work of the heat insulating material support 14 in the present embodiment will be described below.

  A plurality of (e.g., eight) long support members 21 </ b> A to which the support rods 31 </ b> A are attached are sequentially suspended from the traveling crane 29 and carried into the space 16 </ b> C in the auxiliary building 16 from the outside of the auxiliary building 16. , Arranged around the container 5. An operator on the floor 16B installs each supporting member 21A on the base 37 at a predetermined position. A plurality of connecting members 22A carried in by the traveling crane 29 are attached to the supporting members 21A by an operator, and the supporting members 21A are connected to each other by the connecting members 22A. Next, one of the walkways 23A (including the floor board 24A and the handrail 25A) divided into a plurality of parts in the circumferential direction is suspended and carried by the traveling crane 29, and the floorboard 24A of the walkway 23A has at least two support members 21A. Is placed on each support bar 31A. The floor plate 24A is attached to each support bar 31A by an operator on the floor 16B. Similarly, the remaining walkway 23A is carried in and attached to the support bar 31A of the other support member 21A. When the attachment of all the walkways 23A to the respective support bars 31A is completed, the walkways 23A that are attached to the respective support members 21A and surround the container 5 are completed.

  A plurality of (for example, eight) long support members 21B to which the support rods 31B are attached are sequentially carried into the space 16C by the traveling crane 29 in the same manner as the support members 21A. An operator on the floor plate 24A of the walkway 23A attaches the connection plate 30B of each support member 21B to the connection plate 30A of each support member 21A. The worker on the floor plate 24A attaches the carried connection member 22B to the lower end portion of each support member 21B and connects these support members 21B to each other. Thereafter, one of the walkways 23B (including the floor plate 24B and the handrail 25B) divided into a plurality in the circumferential direction is carried in by the traveling crane 29, and the floor plate 24B of the walkway 23B is provided on at least two support members 21B. It is placed on each support bar 31B located below. The floor plate 24B is attached to each support bar 31B by an operator on the floor plate 24A. Similarly, the remaining walkway 23B is carried in and attached to the support bar 31B located on the other support member 21B and positioned below. When the attachment of all the walkways 23B to the support bars 31B located below is completed, one walkway 23B that is attached to each support member 21B and surrounds the periphery of the container 5 is completed. The other walkways 23B located above the walkways 23B are similarly provided on the support members 21B and positioned above by the workers on the floor plate 24B of the walkways 23B previously attached to the support members 21B. Attached to the support bar 31B. In this manner, the two walkways 23B surrounding the periphery of the container 5 are attached to each support member 21B. In addition, each support member 21B is mutually connected also in the upper position by several other connection member 22B.

  A plurality of (e.g., eight) long support members 21 </ b> C each having a long support member 22 </ b> D attached to the upper end with an inclination attached thereto and a support rod 31 </ b> C are sequentially installed in the same manner as the support member 21 </ b> A. 29 is carried into the space 16C. An operator on the floor plate 24B of the corridor 23B located above the corridor 23B provided with the support member 21B attaches the connection plate 30D of each support member 21C to the connection plate 30C of each support member 21B. When the connection plate 30D is attached to the connection plate 30C, the support member 22D is positioned above the top of the container 5 and is inclined toward the central axis of the container 5. The worker on the floor plate 24B of the above-described walkway 23B is attached to the lower end portion of each supporting member 21C to connect the supporting members 21C to each other. Thereafter, one of the walkways 23C (including the floor plate 24C and the handrail 25C) divided into a plurality of portions in the circumferential direction was carried in by the traveling crane 29, and the floor plate 24C of the walkway 23C was provided on at least two support members 21C. It is placed on each support bar 31C. The floor plate 24C is attached to each support bar 31C by the worker on the floor plate 24B. Similarly, the remaining walkway 23C is carried in and attached to the support bar 31C provided on the other support member 21C. When the attachment of all the walkways 23C to the support bars 31C is completed, the walkways 23C that are attached to the support members 21C and surround the container 5 are completed. Thereafter, a plurality of other connecting members 22C are attached to the upper end portions of the support members 21C by workers on the floor plate 24C of the walkway 23C, and the upper end portions of these support members 21C are connected to each other. And each support member 22D is also mutually connected by several connection member 22D.

  With the above operation, the construction of the heat insulating material support 14 surrounding the container 5 in the auxiliary building 16 is completed.

  And the attachment to the heat insulating material support body 14 of the heat insulating material panel 32 using each of the walkways 23A-23C is performed similarly to Example 1. FIG.

  In the present embodiment, each effect produced in the first embodiment can be obtained. However, in this embodiment, the lower support 14A, the intermediate support 14B, and the upper support 14C are not carried into the auxiliary building 16, and the individual members of the support members 21A to 21D and the walkways 23A to 23C are included in the auxiliary building 16. Therefore, the time required for installing the heat insulating material support 14 in the auxiliary building 16 is longer than that in the first embodiment. In this embodiment, the formed walkway 23A is used to install the support member 21B on the support member 21A and the walkway 23B is installed, and the formed walkway 23B is used to support the support member 21C on the support member 21B. Since there is no need to perform scaffold installation work and scaffold dismantling work in the auxiliary building 16, there is no need to perform scaffold installation work and scaffold dismantling work in the auxiliary building 16 in the auxiliary building 16 of the conventional heat insulating material support using the scaffold. Compared with the construction in the above, it is possible to shorten the time required for installing the heat insulating material support member and attaching the heat insulating material.

  The vent apparatus 4 with a filter of each of the first and second embodiments and the method of arranging the heat insulating material around the apparatus may be applied to a pressurized water nuclear plant.

  DESCRIPTION OF SYMBOLS 1 ... Boiling-water type nuclear power plant, 2 ... Reactor containment vessel, 4 ... Vent apparatus with a filter, 5 ... Container, 8 ... Nozzle, 10 ... Filter, 14 ... Heat insulating material support body, 14A ... Lower support body, 14B ... Intermediate support, 14C ... upper support, 16 ... auxiliary building, 18 ... exhaust pipe, 21A, 21B, 21C, 21D ... support member, 23A, 23B, 23C ... corridor, 24A, 24B, 24C ... floor board, 33 ... gas Spouting device.

Claims (4)

Inside, provided with a container each installed a gas ejection device and a filter disposed above the gas ejection device, and a heat insulating material support surrounding the container,
A plurality of first support members disposed so as to surround the container; a first walkway that surrounds the container and is attached to the plurality of first support members; and a plurality of first support members. A plurality of second support members attached to the respective upper ends and surrounding the container; and a second corridor surrounding the container and attached to the plurality of second support members;
A vent device with a filter, comprising a plurality of heat insulating material panels that surround the container and are attached to the heat insulating material support.   The heat insulating material support is modularized, attached to the first support including the plurality of first support members and the first walkway, and the upper end of the first support, and modularized. The vent apparatus with a filter according to claim 1, further comprising a second support body including a plurality of second support members and the second walkway. A plurality of first support members are disposed in the interior surrounding a container installed in an auxiliary building by installing a gas ejection device and a filter disposed above the gas ejection device, respectively, and the auxiliary Installed on the floor of the building,
A first walkway surrounding the container is attached to the plurality of first support members installed in the auxiliary building,
A plurality of second support members are disposed around the container in the auxiliary building, and are attached to upper ends of the plurality of first support members using the first walkway.
A second corridor that surrounds the container is attached to a plurality of second support members attached to each of the first support members in the auxiliary building using the first corridor,
A plurality of heat insulating material panels are arranged around the container, and each of the plurality of first support members and the plurality of second support members is utilized by using each of the first walkway and the second walkway. A method of arranging a heat insulating material around a vent device with a filter, characterized by being attached to a filter. A first support member modularized by having a plurality of first support members arranged in a ring at intervals and a ring-shaped first corridor attached to these first support members is provided as an auxiliary building. Carry it indoors,
The plurality of second supports are installed around a container installed in the auxiliary building by installing a gas jetting device and a filter disposed above the gas jetting device inside the first support body that is loaded. 1 supporting member and the first walkway are arranged on the floor of the auxiliary building,
A plurality of second support members arranged in a ring shape at intervals, and a second support member modularized with a ring-shaped second corridor attached to these second support members, the auxiliary Bring it into the building,
The carried second support is mounted on the first support so that the plurality of second support members and the second corridor are arranged around the container,
A plurality of heat insulating material panels are arranged around the container, and attached to each of the first support body and the second support body using each of the first walkway and the second walkway. A method of arranging a heat insulating material around a vent device with a filter as a feature.

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