JP2013238545A - Radioactive material treatment facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radioactive material treatment facility capable of preventing water from being immersed into an inner side from a device carrying-in area at least in a building and carrying a device to a floor higher than the first floor in the building.SOLUTION: A nuclear reactor building 1 has four external walls 2A to 2D, and a large-sized device carrying-in area 4 and device carrying-in areas 10A to 10E are formed on the first floor in the nuclear reactor building 1. The large-sized device carrying-in area 4 is surrounded by a U-shaped isolation wall 3 except an opening part side blocked by an opening/closing door 5 in an openable and closable manner. The device carrying-in areas 10A to 10E are respectively surrounded by U-shaped isolation walls 9A to 9E. Floors equal to or higher than at least the second floor provided with a watertight hatch block an upper part of the large-sized device carrying-in area 4. A device carried in the large-sized device carrying-in area 4 is lifted by a crane provided on the roof of the nuclear reactor building 1, and carried up to an upper floor through an opening part (the watertight hatch thereof is removed) formed on the floor of a floor equal to or higher than at least the second floor.

Description

  The present invention relates to a radioactive material handling facility, and more particularly, to a radioactive material handling facility suitable for application to a nuclear power plant.

  In a radioactive material handling facility such as a nuclear power plant and a nuclear fuel reprocessing facility, various buildings for handling the radioactive material are provided. Buildings used in nuclear plants, such as nuclear buildings and turbine buildings, are made of reinforced concrete and have an outer wall made of reinforced concrete. The outer wall is provided with a plurality of entrances with open / close doors on the first floor for workers to enter and exit the building from the outside during construction of the nuclear plant and during periodic inspections after the operation of the nuclear plant is stopped. . These entrances are connected to each room and staircase on the first floor of the building. A door is installed at the entrance of each room, but if you open the door, the rooms will be connected. During operation of the nuclear power plant, from the viewpoint of radiation protection, each open / close door at a plurality of entrances for entering and exiting the building from the outside is closed. A building structure that does not allow seawater to enter the building even if a tsunami comes is desired.

  Japanese Patent Laid-Open No. 9-60055 discloses an emergency disaster storage facility that is an example of a building that can prevent water from entering inside. This emergency disaster storage facility is built in a location that is susceptible to various natural disasters such as earthquakes, typhoons, and heavy rains. It is a facility that supplies drinking water and electricity to residents in the affected areas. In the earthquake-resistant building of the emergency disaster storage facility, a water storage tank and a pump room are provided on the roof, and an existing power generation unit and an oil tank are installed in the machine room inside the earthquake-resistant building. The earthquake-resistant building is divided into a front room and a machine room, and a waterproof door is installed at the opening connecting the front room and the machine room. Workers enter and exit the front room from the outside through the doorway formed in the ceiling on the first floor, so even if the area around the emergency disaster storage facility is flooded, the front room and the machine room are flooded. Can be prevented. On the side surface of the front chamber and the outer surface of the side wall of the seismic building, there are respectively provided traps used for entering and exiting workers and the like to the front chamber. Even if water enters the front room through the elevator, the waterproof door is installed, so it is possible to prevent water from entering the machine room. A waterproof sheet is attached to the outer surface of the earthquake-resistant building. Rainwater or the like that enters the front room through the elevator is discharged to the outside of the earthquake-resistant building by a drain pump installed in the front room.

Japanese Patent Laid-Open No. 9-60055

  It is desired to prevent the inflow of seawater into the building of radioactive material handling facilities even when a huge tsunami is pushed by an earthquake. In the building of the emergency disaster storage facility described in Japanese Patent Laid-Open No. 9-60055, the doorway for entering and exiting the outside is not provided on the first floor portion of the outer wall of the building. Since it is performed through a lift opening formed at a position corresponding to the ceiling of the first floor in the building, when a tsunami lower than the ceiling of the first floor rushes, seawater does not flow into the building through the lift opening can do.

  In the radioactive material handling facility, it is necessary to carry the equipment into the building during the construction of the building and the maintenance inspection of the radioactive material handling facility. When an equipment is carried into a building in an emergency disaster storage facility described in Japanese Patent Laid-Open No. 9-60055, an opening that is opened and closed by an opening / closing door is formed on the outer wall of the first floor portion of the building. Equipment must be brought into the building through the department. And, if the door is damaged by the tsunami that has been pushed, seawater will flow into the building.

  An object of the present invention is to handle radioactive substances that can prevent water from entering at least inside the equipment carry-in area in the building and can carry the equipment to a floor above the first floor in the building. To provide facilities.

The feature of the present invention that achieves the above-described object includes a building in which a plurality of devices and piping connected to the devices are installed,
The building has four outer walls and a roof provided at the upper end of these outer walls,
At least one equipment carry-in area formed on the outer wall and communicated with the first opening sealed by the open / close door is formed on the first floor of the building in the building,
The equipment carry-in area and the area other than the equipment carry-in area formed on the first floor are separated from each other by an isolation wall surrounding the equipment carry-in area except for the first opening side,
The floor on the second floor of the building, in which a second opening communicating with the equipment carry-in area is formed, is arranged above the equipment carry-in area,
A water-tight chaining device for sealing the second opening is detachably attached to the second floor,
The second floor, where the second opening is sealed with a watertight chain device, separates the equipment carry-in area and the area above the second floor,
An object of the present invention is to install a lifting device for transferring equipment from the equipment carry-in area to the area above the floor on the second floor through the second opening.

  The equipment carry-in area and the area other than the equipment carry-in area formed on the first floor are separated from each other by an isolation wall surrounding the equipment carry-in area except for the first opening, and the second opening is sealed with a water-tight chain. The second floor, which is blocked by the equipment, separates the equipment carry-in area and the area above the second floor, so that in the unlikely event of a tsunami or flood, at least inside the equipment carry-in area in the building Infiltration of water can be prevented. Moreover, since the water-sealing chain device that seals the second opening is detachably attached to the floor on the second floor, and the lifting device for transporting the equipment is provided in the building, the floor above the first floor in the building The equipment can be transported.

  According to the present invention, it is possible to prevent water from entering at least inside the equipment carry-in area in the building, and it is possible to transport the equipment to a floor above the first floor in the building.

It is a cross section of the 1st floor part of the reactor building used for the nuclear power plant which is a radioactive material handling facility of Example 1 which is one suitable Example of this invention. FIG. 2 is a longitudinal sectional view in the vicinity of a large-size entrance of the reactor building shown in FIG. 1. FIG. 2 is an enlarged longitudinal sectional view in the vicinity of a hatch of the reactor building shown in FIG. 1. It is explanatory drawing which shows the state which conveys an apparatus to the upper floor from a large material entrance in the reactor building shown in FIG. It is explanatory drawing which shows the state which the seawater flowed into the big material entrance in the reactor building shown in FIG. 1 when a tsunami approached. It is a cross section of the 1st floor part of the conventional nuclear reactor building. It is a longitudinal cross-section of the reactor building used for the nuclear power plant which is a radioactive material handling facility of Example 2 which is another Example of this invention. It is explanatory drawing which shows the state which the seawater flowed into the big material entrance in the reactor building shown in FIG. 7 when a tsunami approached.

  Examples of the present invention will be described below.

  A nuclear reactor building used in a nuclear power plant that is a radioactive material handling facility according to embodiment 1 which is a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The reactor building 1 provided in the nuclear power plant of the present embodiment has four outer walls 2A, 2B, 2C and 2D, and a large equipment loading area 4 and equipment loading areas 10A, 10B, 10C, 10D and 10E are provided. It is formed on the first floor in the reactor building 1. In the reactor building 1, a plurality of devices (not shown) constituting the nuclear power plant and a plurality of pipes connecting these devices are installed.

  The large equipment carry-in area 4 is surrounded by a U-shaped isolation wall 3 arranged in the reactor building 1 except for the opening 7 (first opening) side that is closed by the door 5 so as to be opened and closed. It is. The isolation wall 3 has side walls 3A and 3B arranged parallel to the outer walls 2A and 2C and facing each other, and a side wall 3C arranged parallel to the outer wall 2B. The side walls 3A and 3B and the side wall 3C arranged in parallel to the outer wall 2B completely separate the floor 13A of the first floor 14A and the floor of the second floor 14B, that is, the ceiling of the first floor 14A, and the floor 13A of the first floor 14A. It is attached to the ceiling of the first floor 14A and surrounds the large equipment carry-in area 4 except for the outer wall 2B side. The isolation wall 3 completely isolates the large equipment carry-in area 4 and the other area 12 on the first floor 14A existing outside the large equipment carry-in area 4. The large equipment carry-in area 4 further has an area protruding outside the reactor building 1. This area has side walls 6A and 6B arranged to face each other, and the ceiling portion 8 is attached to the upper ends of the side walls 6A and 6B. The side walls 6A and 6B and the ceiling portion 8 are attached to the outer surface of the outer wall 2B. An opening 7 that communicates with the outside of the large equipment loading area 4 is formed by being surrounded by the side walls 6A and 6B and the ceiling 8 at the front ends of the side walls 6A and 6B. The open / close door 5 is rotatably attached to the end portions of the side walls 6A and 6B, respectively, and opens and closes the opening 7. When the open / close door 5 is closed, the opening 7 of the large equipment loading area 4 is blocked.

  The equipment carry-in area 10A is surrounded by a U-shaped isolation wall 9A disposed in the reactor building 1 except for an opening (first opening) formed in the outer wall 2B. The lower end of the isolation wall 9A is attached to the floor 13A of the first floor 14A, and the upper end of the isolation wall 9A is attached to the ceiling of the first floor 14A. The isolation wall 9A completely isolates the equipment carry-in area 10A and the other area 12 on the first floor 14A. The open / close door 11A is rotatably attached to the outer wall 2B, and further opens and closes an opening formed in the outer wall 2B that communicates with the device carry-in area 10A.

  The equipment carry-in area 10B is surrounded by a U-shaped isolation wall 9B disposed in the reactor building 1 except for an opening (first opening) formed in the outer wall 2C. The lower end of the isolation wall 9B is attached to the floor 13A of the first floor 14A, and the upper end of the isolation wall 9B is attached to the ceiling of the first floor 14A. The isolation wall 9B completely isolates the equipment carry-in area 10B and the other area 12 on the first floor 14A. The opening / closing door 11B is rotatably attached to the outer wall 2C, and further opens and closes an opening formed in the outer wall 2C that communicates with the device carry-in area 10B.

  The equipment carry-in area 10C is surrounded by a U-shaped isolation wall 9C arranged in the reactor building 1 except for an opening (first opening) formed in the outer wall 2A. The lower end of the isolation wall 9C is attached to the floor 13A of the first floor 14A, and the upper end of the isolation wall 9C is attached to the ceiling of the first floor 14A. The isolation wall 9C completely separates the equipment carry-in area 10C from the other area 12 on the first floor 14A. The opening / closing door 11C is rotatably attached to the outer wall 2A, and further opens and closes an opening formed in the outer wall 2A that communicates with the device carry-in area 10C.

  The equipment carry-in area 10D is surrounded by an isolation wall 9D arranged in a U shape in the reactor building 1 except for an opening (first opening) formed in the outer wall 2A. The lower end of the isolation wall 9D is attached to the floor 13A of the first floor 14A, and the upper end of the isolation wall 9D is attached to the ceiling of the first floor 14A. The isolation wall 9D completely isolates the equipment carry-in area 10D and the other area 12 on the first floor 14A. The open / close door 11D is rotatably attached to the outer wall 2A, and further opens and closes an opening formed in the outer wall 2A that communicates with the equipment carry-in area 10D.

  The equipment carry-in area 10E is surrounded by an isolation wall 9E arranged in a U-shape in the reactor building 1 except for an opening (first opening) formed in the outer wall 2B. The lower end of the isolation wall 9E is attached to the floor 13A of the first floor 14A, and the upper end of the isolation wall 9E is attached to the ceiling of the first floor 14A. The isolation wall 9E completely isolates the equipment carry-in area 10E from the other area 12 on the first floor 14A. The opening / closing door 11E is rotatably attached to the outer wall 2B, and further opens and closes an opening formed in the outer wall 2B that communicates with the equipment carry-in area 10E.

  As shown in FIG. 2, the reactor building 1 includes a first floor 14A, a second floor 14B, a third floor 14C, a fourth floor 14D, and a fifth floor 14E, and further includes a first basement floor 14F and a second basement floor 14G. . In the reactor building 1, no doors are provided on the second floor 14 </ b> B of the outer walls 2 </ b> A, 2 </ b> B, 2 </ b> C, and 2 </ b> D.

  An opening formed in the first floor 14A outside the large equipment loading area 4 is sealed with a watertight hatch 19F. On the floor 13B of the second floor 14B, an opening 26A (see FIG. 4) connected to the large equipment carry-in area 4 is formed, and the opening 26A (second opening) is sealed with a watertight hatch 19B. Furthermore, another opening (second opening) communicated with the large equipment carry-in area 4 is sealed on the floor 13B with a watertight hatch 19A. The floor 13B of the second floor 14B in which the other opening communicated with the large equipment loading area 4 is sealed with the watertight hatch 19A and the opening 26A is sealed with the watertight hatch 19B is the area of the large equipment loading area 4 and the second floor 14B. Is isolated. On the floor 13C of the third floor 14C, an opening 26B (see FIG. 4) is formed immediately above the opening 26A, and this opening 26B (second opening) is sealed with a watertight hatch 19C. . On the floor 13D of the fourth floor 14D, an opening 26C (see FIG. 4) is formed immediately above the opening 26B, and this opening 26C (second opening) is sealed with a watertight hatch 19D. . On the floor 13E of the fifth floor 14E, an opening 26D (see FIG. 4) is formed immediately above the opening 26C, and the opening 26D (second opening) is sealed with a watertight hatch 19E. . In the floor 13F of the first basement floor 14F, an opening formed so as to be located immediately below the opening sealed by the watertight hatch 19F is sealed by the watertight hatch 19G. Openings formed at other positions on the floor 13F are blocked by a watertight hatch 19I. 21 is the ground surface.

  A partial roof 16A of the reactor building is formed directly above the watertight hatch 19A and above the floor 13C, and is attached to the outer wall 15. The outer wall 2B is an outer wall on the first floor 14A, the second floor 14B, the third floor 14C, and the fourth floor 14, and the outer wall 15 is an outer wall on the fifth floor 14E. The roof 16A is the same height as the floor 13E. The reactor building roof 16B attached to the outer wall 15 is located above the floor 13E of the fifth floor 14E.

  A crane 17 (lifting device) for lifting the equipment is attached to the lower surface of the roof 16B (the ceiling of the fifth floor 14E) at a position directly above the watertight hatch 19E. A rail 20 (guide member) of a monorail (equipment transfer device) that transports equipment is attached to the lower surface of the roof 16B and extends in the horizontal direction from the position of the crane 17. A monorail rail 18A (guide member) is provided on the lower surface of the floor 13C (the ceiling of the second floor 14B), and extends horizontally from the position of the opening 26B. A rail 18B (guide member) of a monorail is provided on the lower surface of the floor 13D (the ceiling of the third floor 14C) and extends in the horizontal direction from the position of the opening 26C. A monorail rail 18C (guide member) is provided on the lower surface of the floor 13E (the ceiling of the fourth floor 14D) and extends horizontally from the position of the opening 26D.

  As with the openings 26A, 26B, 26C, and 26D, which are located directly above the large equipment carrying-in area 4 and communicated with the large equipment carrying-in area 4, the respective equipment carrying areas 10B, 10C, and 10D are also provided. Openings that are located directly above the carry-in area and communicate with the respective equipment carry-in areas 4 are formed in the floors 13B, 13C, 13D, and 13E, respectively. These openings are also sealed with a watertight hatch. A crane (not shown) is provided on the lower surface of the roof 16B at a position directly above each of the equipment carry-in areas 10B, 10C, and 10D.

  Furthermore, in the device carry-in areas 10A and 10E, as well as the openings 26A, 26B, 26C, and 26D that are respectively located directly above the large product carry-in area 4 and communicate with the large product carry-in area 4, Openings that are respectively located directly above the areas 10A and 10E and communicate with the respective equipment carry-in areas 4 are formed in the floors 13B, 13C, and 13D, respectively. These openings are also sealed with a watertight hatch. Cranes (not shown) are respectively provided on the lower surface of the roof 16A at positions directly above the equipment carry-in areas 10A and 10E.

  The floor 13B of the second floor 14B in which the openings connected to the equipment carry-in areas 10A to 10E are respectively sealed with watertight hatches separates the areas of the equipment carry-in areas 10A to 10E from the areas of the second floor 14B.

  The structure of each watertight hatch (watertight chain device) will be described with reference to FIG. 3, taking the watertight hatch 19B as an example. The opening 26A to which the watertight hatch 19 is removably attached has a stepped portion, and the upper inner diameter is larger than the lower inner diameter. A rubber seal member 22 is attached to the entire inner surface of the opening 26A. The watertight hatch 19B inserted into the opening 26A has a stepped portion on the outer surface, and the upper outer diameter is larger than the lower outer diameter. A rubber seal member 23 is attached to the entire outer surface of the watertight hatch 19B. The watertight hatch 19B is inserted into the opening 26A from above. In this state, the outer surface of the seal member 23 is in close contact with the inner surface of the seal member 22. A ring-shaped fixing bracket 24 is placed on the upper surfaces of the floor 13B and the watertight hatch 19B so as to cover the sealing members 22 and 23, and is fixed to the floor 13B by a fastening tool 25A and fixed to the watertight hatch 19B by a fastening tool 25B. . A large number of plate-like fixing brackets 24 extend in the radial direction of the watertight hatch 19B, and are arranged at predetermined intervals in the circumferential direction of the watertight hatch 19B.

  In order for the worker to enter and exit the reactor building 1, a staircase or a ladder is not shown, but is provided on the outer surface of the outer wall 2 </ b> B, for example. This staircase or ladder reaches the height of the floor 13C of the third floor 14C. The entrance for the worker is formed on the third floor 14C portion of the outer wall 2B, and is sealed by an opening / closing door that is rotatably attached to the outer wall 2B. The worker can enter the third floor 14 </ b> C in the reactor building 1 through the worker doorway by opening the open / close door on the stairs or ladder.

  In the periodic inspection period after the operation of the nuclear power plant is stopped, a certain device installed in the nuclear power plant is replaced with a new device. This device exchange will be described with reference to FIG. 4, taking as an example the case of using the large equipment carry-in area 4. For example, along the rail 20 attached to the lower surface of the roof 16B on the fifth floor 14F of the reactor building 1 in a state where the equipment 28 to be exchanged is removed from the nuclear power plant and surrounded by a radiation shielding body. It is suspended by the moving monorail and moved to the position of the crane 17. The radiation shield is attached to the device 28 while the device 28 is transported to a predetermined storage location and while the device 28 is stored at the storage location. This device 28 is suspended from a hook (not shown) attached to the tip of the wire 27 of the crane 17 and then removed from the monorail moving on the rail 20. The device 28 surrounded by the radiation shielding body is lowered to the large equipment loading area 4 through the openings 26D, 26C, 26B and 26A sequentially by rewinding the wire 27 of the crane 17 and into the large equipment loading area 4. It is placed on a trailer (not shown) that has stopped. The trailer carrying the removed equipment 28 is transported to a predetermined storage location outside the reactor building 1 through the opening 7 in the large equipment delivery area 4 because the open / close door 5 is open. The watertight hatches 19E, 19D, 19C and 19B attached to the openings 26D, 26C, 26B and 26A, respectively, are removed in advance before the device 28 is lowered by removing the fixing bracket 24 and the fastening tools 25A and 25B. Yes. An overhead crane (not shown) installed near the roof 16B on the fifth floor 14E in the reactor building 1 may be used to move the removed equipment.

  If the total weight of the equipment removed from the nuclear power plant and the weight of the radiation shield surrounding this equipment exceeds the weight that can be transported by the monorail moving on the rail 20, that equipment, for example, a large equipment, It is cut into a size that is a predetermined area in the reactor building, and a plurality of pieces of large equipment are stored in a plurality of storage containers having a predetermined volume. A radiation shield is attached to the storage container so as to surround the periphery. Each storage container surrounded by a radiation shield and containing a plurality of pieces of equipment inside is transferred to a trailer stopped in the large equipment delivery area 4 using a monorail that moves the rail 20 and the crane 17. Is done. The plurality of storage containers that store the plurality of cut pieces loaded on the trailer are transported to a predetermined storage location by the trailer.

  New equipment 28 to be attached to the nuclear power plant instead of the removed equipment is loaded on the trailer and carried into the large equipment loading area 4 where the open / close door 5 is open. The device 28 is suspended from the hook of the crane 17 and is pulled up to the fifth floor 14F through the openings 26A, 26B, 26C and 26E by winding the wire 27 of the crane 17. Thereafter, the equipment 28 is transferred from the crane 17 to a monorail that moves along the rail 20, and is transferred by the monorail to a position where it is installed in the nuclear power plant or the vicinity thereof. The new equipment 28 carried in is installed at a predetermined position of the nuclear power plant.

  When the new equipment 28 carried into the large equipment carry-in area 4 is attached to a predetermined position of the nuclear power plant on the second floor 14B, the new equipment 28 lifted from the big equipment carry-in area 4 to the second floor 14B through the opening 26A by the crane 17. However, it is moved to the monorail which moves the rail 18A, and is conveyed to the predetermined position of the second floor 14B. When the new equipment 28 is attached to the nuclear power plant on the third floor 14C, the new equipment 28 lifted up to the third floor 14C by the crane 17 is transferred to the monorail moving on the rail 18B and transported to a predetermined position on the third floor 14C. Is done. In addition, when the new equipment 28 is attached to the nuclear power plant on the fourth floor 14D, the new equipment 28 lifted up to the fourth floor 14D by the crane 17 is moved to the monorail moving on the rail 18C, and the predetermined position on the fourth floor 14D. It is conveyed to.

  The example which conveys the new apparatus 28 carried in to the big equipment carrying-in area 4 to the 1st floor 14A, the 1st underground 14F, and the 2nd underground 14G is demonstrated. When a new device 28 is installed in a nuclear power plant at a certain location on the first floor 14A, as described above, the new device 28 is moved to a monorail that transports the rail 18A, and the new device 28 is made watertight by the monorail. A crane (not shown) provided on the lower surface of the floor 13C (the ceiling of the second floor 14B) just above the opening (the watertight hatch is removed) formed in the floor 13B at a position other than the hatches 19A and 19B. Transport to nearby. The new equipment 28 is transferred to this crane and lowered to the first floor 14A, and is transported to the installation position using a monorail or the like on the first floor 14A. When installing a new device 28 in a nuclear power plant at a certain location on the first floor 14F, the new device 28 lowered to the first floor 14A by a crane provided on the lower surface of the floor 13C (the ceiling of the second floor 14B). Furthermore, it is lowered to the first basement floor 14F through the opening formed in the floor 13A (with the watertight hatch removed). The new equipment 28 is transported to the installation position using a monorail or the like on the first basement floor 14F. When installing a new device 28 in a nuclear power plant at a certain location on the second floor 14G, the new device 28 lowered to the first floor 14F by a crane provided on the lower surface of the floor 13C (the ceiling of the second floor 14B). Furthermore, it is lowered to the second basement floor 14G through the opening formed in the floor 13F (with the watertight hatch removed). The new equipment 28 is transported to the installation position using a monorail or the like on the second basement floor 14G.

  After the loading / unloading of the device 28 is completed, the watertight hatches 19B, 19C, 19D and 19E are fitted into the openings 26A, 26B, 26C and 26D formed in the floors 13B, 13C, 13D and 13E, and the fixing bracket 24 and It is fixed to the floors 13B, 13C, 13D and 13E by the fasteners 25A and 25B. Since the outer surface of the seal member 23 of these watertight hatches fixed by the fixing bracket 24 and the fastening tools 25A and 25B is in close contact with the inner surface of the seal member 22 provided on the inner surface of each opening, as will be described later. When seawater enters the large equipment carry-in area 4 when a tsunami occurs, this seawater can be prevented from entering the area of the second floor 14B.

  In the period of the regular inspection, by opening the open / close doors 11A to 11E, the devices are carried into the device carry-in areas 9A to 9E by the trailer. This equipment is lifted up to the corresponding floor by a crane attached to the roof at a position directly above each equipment area in the same manner as in the case of the big equipment carried into the big equipment carry-in area 4, and in the reactor building 1. It is transferred to a predetermined position by a monorail and installed at a predetermined position in the nuclear power plant. At the time of loading (or unloading) of this device, the watertight hatch located immediately above each device loading area is removed from the floor. After the carrying-in (or carrying-out) of the equipment is finished, these watertight hatches are attached to the corresponding floor in the same manner as the watertight hatches 19B to 19E.

  It is assumed that a tsunami generated by the occurrence of an earthquake rushes toward the reactor building 1 and the door 5 is damaged by this tsunami. As shown in FIG. 5, it is assumed that the water surface 30 of the seawater 29 has reached the height between the floor 13B and the floor 13C due to the tsunami that has been pushed. Seawater rushed in the form of a tsunami enters the large equipment delivery area 4 surrounded by the isolation wall 3. This seawater is only blocked by the isolation wall 3 and the floor 13B to which the watertight hatches 19A and 19B are attached, and enters the large equipment loading area 4. The seawater 29 does not enter the area inside the reactor building 1 other than the large equipment loading area 4, for example, the area on the first floor 14A inside the isolation wall 3 and the second floor 14B. Even if seawater intrudes into the large equipment loading area 4, the upper surfaces of the watertight hatches 19A and 19B are held by the predetermined number of fixing brackets 24 arranged in the circumferential direction, so the watertight hatches 19A and 19B. Will not rise.

  As shown in FIG. 6, a conventional nuclear power plant nuclear reactor building 1B has outer walls 2A, 2B, 2C, and 2D. The doors 5A, 11A, and 11E are attached to the outer wall 2B, and the door 11B is attached to the outer wall 2C. The doors 11C and 11D are attached to the outer wall 2A. The open / close door 5A opens and closes the large equipment carry-in area 4A. Specifically, the open / close door 5A is disposed opposite to each other and attached to the side walls 6A and 6B provided on the outer wall 2B. A ceiling portion (not shown) is formed at the upper ends of the side walls 6A and 6B. The large equipment carry-in area 4A is formed between the side wall 6A and the side wall 6B. The open / close doors 11 </ b> A to 11 </ b> E open and close an opening for carrying in equipment formed on the corresponding outer wall. Since the reactor building 1B is not formed with an isolation wall like the reactor building 1 of this embodiment, in the unlikely event that the door is damaged by a tsunami, the first floor of the reactor building 1B Seawater enters the entire area. Further, in the reactor building 1B, for example, an opening formed in the floor on the second floor that passes when a large equipment carried into the large goods carrying area is lifted is not provided with a hatch. For this reason, as shown in FIG. 5, when a tsunami higher than the floor 13B of the second floor 14B rushes, the open / close door provided in the large equipment loading area should be damaged in the reactor building 1B. The seawater that has infiltrated into the floor also enters above the floor of the second floor.

  According to this embodiment, in the reactor building 1, each equipment carry-in area is surrounded by the isolation wall except for the door side, and watertight hatches 19A and 19B are attached directly above each equipment carry-in area. In addition, since the floor 13B of the second floor 14B exists, even if the door is damaged by the time of the tsunami, seawater only enters the area of the equipment carry-in area, and the reactor building 1 In this case, seawater can be prevented from entering a region other than the device carry-in area. Furthermore, according to the present embodiment, in a normal state where no tsunami comes, the crane provided on the roof 16B (or 16A) of the reactor building 1 is removed by removing each watertight hatch located immediately above the equipment carry-in area. Thus, the equipment carried into the equipment carry-in area can be transported to a predetermined floor in the reactor building 1.

  A reactor building of a nuclear power plant that is a radioactive material handling facility according to embodiment 2, which is another embodiment of the present invention, will be described with reference to FIG.

  The reactor building 1A provided in the nuclear power plant according to the present embodiment has an opening / closing door 5 on the first floor portion of the outer walls 2A, 2B, 2C, and 2D like the nuclear reactor building 1 used in the nuclear power plant according to the first embodiment. And 11A to 11E are not provided, and an opening / closing door 32A (see FIG. 8) is provided on the third floor portion of the outer wall thereof. For this reason, in the reactor building 1A, a protruding portion 16C extending outward from the outer wall is formed on each outer wall at the height of the floor 13E of the fifth floor 14E, and a crane 33 (elevating device) is formed on the lower surface of the protruding portion 16C. Is installed. A rail (guide member) 34 of a monorail (equipment transfer device) that transports equipment is provided from the crane 33 toward the reactor building 1A. Further, although not shown in FIG. 7, as in the first embodiment, rails (guide members) 18A, 18B, and 18C of monorails (device transfer devices) are provided. Rail 18A is provided on the lower surface of floor 13C (the ceiling of second floor 14B) and extends from the position of opening 26B. A rail 18B is provided on the lower surface of the floor 13D (the ceiling of the third floor 14C) and extends from the position of the opening 26C. A monorail rail 18C is provided on the lower surface of the floor 13E (the ceiling of the fourth floor 14D) and extends from the position of the opening 26D.

  Similarly to the reactor building 1, a staircase or ladder reaching the height of the floor 13C of the third floor 14C is not shown in order to allow workers to enter and exit the reactor building 1A. For example, on the outer surface of the outer wall 2B Is provided. An entrance for a worker sealed by an opening / closing door rotatably attached to the outer wall 2B is formed in the third floor 14C portion of the outer wall 2B. The worker can enter the third floor 14 </ b> C in the reactor building 1 </ b> A through the doorway for the worker by opening the door by going up the stairs or ladder.

  In the periodic inspection period after the operation of the nuclear power plant is stopped, a certain device installed in the nuclear power plant is replaced with a new device. This replacement of equipment will be described with reference to FIG. The watertight hatches 19D and 19E are removed when the device is replaced. The equipment 28A to be exchanged is removed from the nuclear power plant and is surrounded by a radiation shielding body, for example, suspended on a monorail that moves along the rail 20 on the fifth floor 14F to the position of the crane 17 Moving. The radiation shield is attached to the device 28A while the device 28A is transported to a predetermined storage location and while the device 28A is stored at the storage location. The device 28A surrounded by the radiation shield is suspended from a hook attached to the tip end of the wire 27 of the crane 17 and then removed from the monorail that moves the rail 20 in the same manner as the device 28 in the first embodiment. . The device 28A is lowered to the third floor 14C through the openings 26D and 26C by rewinding the wire 27 of the crane 17. The equipment 28A lowered to the third floor 14C is placed on a transport vehicle (not shown) and transferred to the equipment carry-in area 31 formed on the third floor 14C. The equipment 28A is suspended by a monorail (not shown) that moves the rail 34 in the equipment carry-in area 31, and since the opening / closing door 32A is open, it is carried out of the reactor building 1A through the opening 32. The The device 28A transferred to the vicinity of the crane 33 is suspended by a hook (not shown) attached to the tip of the wire 35 of the crane 33, and then removed from the monorail that moves on the rail 34. The replacement of the device 28A from the monorail to the hook at the tip of the wire 35 is performed by a worker on a work table (not shown) installed on the outer wall 2B side outside the reactor building 1A. Thereafter, the device 28A is lowered by rewinding the wire 27 of the crane 17, and is placed on a trailer (not shown) that stops outside the reactor building 1A and directly below the crane 33. The device 28A surrounded by the radiation shield is transported to a predetermined storage location by a trailer.

  Also in the present embodiment, when the total weight of the equipment removed from the nuclear power plant and the weight of the radiation shield surrounding the equipment exceeds the weight that can be transported by the monorail that moves the rail 20, Similarly to 1, the device is cut into a plurality of pieces, and the storage container enclosed with the radiation shielding body is stored outside the reactor building 1A using a monorail or the like. good.

  The new equipment 28A attached to the nuclear power plant instead of the removed equipment 28A is loaded on the trailer and transported to the position just below the crane 33 outside the reactor building 1A. The new equipment 28A is transported to the installation position of the nuclear power plant in the reactor building 1A by reversing the transportation path of the removed equipment 28A. That is, the new device 28 </ b> A is suspended from the hook of the crane 33 and is lifted up to the height of the opening 32 by winding the wire 35 of the crane 33. The new equipment 28 </ b> A is moved from the crane 33 to the monorail that moves the rail 34, and is transported to the equipment carry-in area 31. Here, the new equipment 28A is moved to the transport carriage and transported to the position directly below the crane 17 on the third floor 14C. The new equipment 28A suspended from the hook of the crane 17 is lifted up to the fifth floor 14F through the openings 26C and 26E by winding the wire 27 of the crane 17. Thereafter, the new equipment 28 </ b> A is transferred to or near the position where the new equipment 28 </ b> A is installed in the nuclear power plant by the monorail moving along the rail 20. The new equipment 28A carried in is installed at a predetermined position of the nuclear power plant.

  The opening / closing door 32 </ b> A is closed and the opening 32 is blocked except when the device is carried in and out through the opening 32.

  Assume that a tsunami generated by the occurrence of an earthquake rushes toward the reactor building 1A. As shown in FIG. 8, it is assumed that the water surface 30 of the seawater 29 has reached the height between the floor 13B and the floor 13C due to the tsunami that has been pushed. Since the reactor building 1A does not have an opening / closing door on each part of the first floor 14A and the second floor 14B of the outer walls 2A, 2B, 2C and 2D, the tsunami seawater that has been pushed in is the first floor 14A of the reactor building 1A. And it can prevent entering into each area | region of the second floor 14B.

  In the present embodiment, since the first floor 14A of the reactor building 1A is not provided with an opening / closing door, the probability of seawater entering the reactor building 1A can be reduced more than in the first embodiment. Further, according to the present embodiment, in a normal state where no tsunami comes, the reactor building is installed through an opening formed on the third floor 14C portion of the outer wall of the equipment attached to the nuclear plant using the crane 33 provided in the overhanging portion 16C. It can be carried into 1A, and this equipment can be transported to a predetermined floor in reactor building 1A.

  The above-described structure of each building used in the nuclear power plants of Examples 1 and 2 can be applied to the turbine building of the nuclear power plant. Further, the nuclear power plants of Examples 1 and 2 are installed near the sea to supply seawater to a condenser that condenses steam exhausted from the turbine of the nuclear power plant, but are exhausted from the turbine. The structure of each of the above-described buildings used in the nuclear power plant of Examples 1 and 2 in the reactor building and the turbine building of the nuclear power plant installed beside the river, using the water of the river as a condenser for condensing steam Can be applied. In this case, even when the water of the river that has been flooded due to flooding is pushed to the reactor building and the turbine building, the water can be prevented from entering the building.

  The structure of each building described above used in the nuclear power plants of Examples 1 and 2 can be applied to a radioactive material handling facility other than the nuclear power plant, for example, a building of a nuclear fuel reprocessing facility.

  DESCRIPTION OF SYMBOLS 1,1A ... Reactor building, 2A, 2B, 2C, 2D ... Outer wall, 3, 9A-9E ... Separation wall, 5 ... Large equipment loading area, 7, 26A-26D, 32 ... Opening, 10A-10E, 31 ... Equipment carry-in area, 11A to 11E, 32A ... Open / close door, 13A to 13F ... Floor, 14A ... First floor, 14B ... Second floor, 14C ... Third floor, 14D ... Fourth floor, 14E ... Fifth floor, 14F ... Basement first floor, 14G ... Second basement, 16A, 16B ... Roof, 16C ... Overhang, 17, 33 ... Crane, 18A-18C, 20, 34 ... Rail, 19A-19I ... Watertight hatch, 22, 23 ... Seal member, 24 ... Fixing bracket .

Claims (6)

It has a building in which multiple devices and piping connected to this device are installed.
The building has four outer walls and a roof provided at the upper end of these outer walls,
At least one equipment carry-in area formed in the outer wall and communicated with a first opening sealed with an opening / closing door is formed on the first floor of the building in the building,
The device carry-in area and an area other than the device carry-in area formed on the first floor are separated from each other by an isolation wall surrounding the device carry-in area except for the first opening side,
A floor of at least two floors or more of the building, in which a second opening communicating with the device carry-in area is formed, is disposed above the device carry-in area,
A water sealing chain device for sealing the second opening is detachably attached to the floor of at least the second floor;
The floor of at least the second floor or more in which the second opening is sealed by the water-sealing chain device separates the equipment carry-in area and the area above the floor of the at least the second floor or more;
A radioactive substance handling facility, wherein an elevating device for transferring the device from the device carry-in area to the area above the floor of at least two floors or more through the second opening is installed in the building.   The radioactive substance handling facility according to claim 1, wherein the lifting device is provided on a roof of the building.   A floor of another floor is installed between the floor of the at least two floors and the roof in the building, and the other floor is directly above the second opening formed in the floor of the at least two floors or more. Another water-tight device that forms another second opening in the floor and seals the other second opening is detachably attached to the floor of the other floor, and the floor of the other floor The guide member which guides the apparatus transfer apparatus arrange | positioned under this is attached to the floor of said other floor so that it may extend in a horizontal direction from said other 2nd opening part. Facility for handling radioactive materials.   2. A seal member is attached to the inner surface of the second opening, and another seal member that is fitted in the second opening and seals the second opening is attached to the sealing device. The radioactive material handling facility described in 1. It has a building in which multiple devices and piping connected to this device are installed.
The building has four outer walls and a roof provided at the upper end of these outer walls,
An equipment carry-in area formed in the outer wall and communicated with the first opening sealed by the door is formed on the second floor of the floor above the first floor of the second floor of the building in the building,
An overhanging portion projecting outward from the outer wall in which the first opening is formed is provided on the outer wall in which the first opening is formed at a position above the second floor;
A first lifting device for transferring the device to the height of the first opening is provided in the overhang;
A first guide member for guiding the first device transfer device, which is disposed below the overhang portion, is attached to the overhang portion so as to extend horizontally from the first lifting device to the inside of the device carry-in area,
A radioactive material handling facility, wherein a second lifting device for transferring the device from the upper floor to an area above the upper floor in the building is installed in the building.   The radioactive substance handling facility according to claim 5, wherein the second lifting device is provided on a roof of the building.

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