JP2006071323A - Reactor pressure vessel carrying-out method and reactor pressure vessel carrying-in method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out or carry in a reactor pressure vessel without providing a temporary opening on the roof of a reactor building, or without installing a large-scale crane in the outdoors of the reactor building. <P>SOLUTION: This reactor pressure vessel carrying-out method has processes of: providing a temporary opening 6 on the side wall on a fuel operation floor of the reactor building 18; and carrying out the reactor pressure vessel 1 through the temporary opening 6. The method also has a process of installing a jack bridge 7 in the outdoors of the reactor building, and a lowering process of lowering the reactor pressure vessel 1 carried out from the temporary opening 6 onto the ground in the laid-down state by the jack bridge 7. The method also has processes of: hoisting the reactor pressure vessel 1 in an apparatus temporary placing pool 11 inside the reactor building 18 in the inclined or laid-down state onto the fuel operation floor before carrying out the reactor pressure vessel 1 through the temporary opening 6; and conveying the reactor pressure vessel 1 lowered onto the ground by the jack bridge 7 in the laid-down state as it is to a storage warehouse near the reactor building 18. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for carrying out a reactor pressure vessel from a reactor building in an existing nuclear power plant, and a method for carrying in a new reactor pressure vessel into the reactor building after that.

  As a method for carrying out and carrying in a reactor pressure vessel in an existing nuclear power plant, for example, there is a method of Patent Document 1. This is because the reactor pressure vessel is unloaded, a temporary opening is provided in the roof of the reactor building in which the reactor pressure vessel is stored, and the reactor pressure vessel is installed outside the temporary opening. It is a method of carrying out by a lifting machine.

  Further, in the method disclosed in Patent Document 2, a temporary opening for carrying out the reactor pressure vessel is provided in the roof of the reactor building, and the opening and closing that can prevent the release of radioactive substances at the temporary opening. Provide possible doors.

  A boiling water nuclear power plant heats cooling water with heat from a controlled fission reaction inside a reactor pressure vessel housed in the reactor building, and steam generated from the heat generates turbines and generators. Rotate to generate electricity. The reactor pressure vessel is a large-sized device having a diameter of about 4.5 m to 7 m, a height of about 17 m to 20 m, and a weight of about 500 t to 800 t, depending on the output of the nuclear power plant. When the reactor pressure vessel reaches the end of its useful life, the reactor pressure vessel is removed from the reactor building and stored for dismantling the nuclear power plant.

  In addition, as a measure to extend the operating period of an operating nuclear power plant, it is considered to replace a reactor pressure vessel that has reached the end of its useful life with a new reactor pressure vessel. In addition to carrying out the reactor pressure vessel from the reactor building, it is necessary to carry in and install a new reactor pressure vessel into the reactor building.

  From the above, there is a need for a method for carrying out an old reactor pressure vessel from a reactor building and a method for carrying a new reactor pressure vessel into the reactor building.

In the technique of Patent Document 1, a temporary opening is provided on the roof of the reactor building, and an old reactor pressure vessel is lifted from the temporary opening using a large lifting machine installed outside the reactor building. A method of carrying out outdoors is disclosed. Also, in reverse order, a new reactor pressure vessel is lifted by a large lifting machine installed outside the reactor building and carried into the reactor building from the temporary opening on the roof of the reactor building. It is disclosed.
Japanese Patent No. 3343447 JP-A-11-311893

  The above known technique has the following problems.

  (1) It is necessary to provide a temporary opening on the roof of the reactor building. The reactor pressure vessel is generally installed at a substantially central portion of the reactor building, and the temporary opening is provided directly above the reactor pressure vessel. As described above, the reactor pressure vessel has a diameter of about 4.5 m to 7 m, and since the reactor pressure vessel has a nozzle for pipe connection, the temporary opening has a diameter of about 6 m to 10 m or more. It is necessary to provide a temporary opening.

  The roof of the reactor building is installed on the upper part of the fuel operation floor, but the fuel operation floor requires a space for fuel operation, a reactor pressure vessel lid, etc. during periodic inspection of the nuclear power plant. Therefore, the roof of the reactor building is supported at a large interval, and pillars and the like for supporting the roof are not arranged in the middle. For this reason, the roof of the reactor building is generally supported by the columns and walls of the reactor building by providing a truss structure material at the lower part of the roof or by forming a dome-like roof.

  If you try to provide a temporary opening in the center of the roof of this reactor building, there is a need to remove part of the truss structure material, so the roof cannot be structurally supported and the entire roof can collapse There is sex. In order to prevent this, it is necessary to support the roof by setting a large reinforcing material in the temporary opening or by using a temporary pillar.

  (2) A temporary opening is provided in the roof, and the old reactor pressure vessel is lifted and carried out from there, and when a new reactor pressure vessel is to be carried in, the lift that can be carried in and out beyond the roof of the reactor building. Heavy equipment is required. The height of the reactor building varies depending on the conditions of the location, but it is not uncommon for the height of the reactor building to be close to 50 meters above the ground. Moreover, since the reactor pressure vessel is a heavy article of about 400 t to 800 t as described above, a large lifting machine having a very large suspension capacity is required. Large lifting machines having such a lifting capacity are limited to several lifting machines in the world.

  (3) Such a lifting machine with a large lifting capacity is a huge lifting machine itself. In order to install and operate the lifting machine outside the reactor building, it is at least a flat site of about 50m square. Is required. In the reactor building, a turbine building, a control building, a waste treatment building, etc. are built adjacent to each other, and outdoor facilities such as tanks and piping for storing water and light oil are installed around the reactor building. There are many. For this reason, when it is going to install a large lifting machine outdoors of a reactor building, it will be necessary to remove or transfer a part of outdoor equipment which interferes with the operating site of a large lifting machine.

  (4) In addition, if the site where a large lifting machine is operating, if the ground is deformed due to uneven sinking when a heavy object is suspended, the lifting machine may be out of balance and collapse. It is necessary to construct a ground with a large earth bearing capacity. In order to construct such a strong ground, it is necessary to improve the ground and to construct a reinforced concrete floor slab having a thickness of about 500 mm on the improved ground.

  (5) Moreover, a large lifting machine requires a large site of about 60 m × 200 m for assembly and disassembly of the lifting machine itself. If such a site cannot be secured around the reactor building due to restrictions on outdoor structures, it is necessary to assemble and move a large lifting machine in some area of the nuclear power plant premises. Since a large lifting machine exceeds 1,000 tons even with its own weight alone, it is necessary to secure a flat ground for the route for moving the large lifting machine, and it is necessary to ensure the strength of the ground with an iron plate or the like. In addition, when a pipe or a buried trench intersects the moving route, these reinforcing works may occur.

  In order to solve the above problems, the present invention provides an old reactor pressure vessel without providing a temporary opening on the roof of the reactor building and without installing a large lifting machine outside the reactor building. It is an object of the present invention to provide a method capable of unloading or loading a new reactor pressure vessel.

  The present invention solves the above-mentioned problem, and in a reactor pressure vessel unloading method for unloading a reactor pressure vessel from a reactor building containing a reactor pressure vessel, the present invention provides a side wall of a fuel operation floor of the reactor building. A step of providing a temporary opening; and a step of unloading the reactor pressure vessel through the temporary opening.

  Further, the present invention provides a reactor pressure vessel loading method in which a new reactor pressure vessel is carried into the reactor building after an existing reactor pressure vessel is carried out from the reactor building, and a fuel operation level of the reactor building is provided. The reactor pressure vessel is carried in through a temporary opening provided on the side wall of the reactor.

  According to the present invention, it is possible to carry out an old reactor pressure vessel or carry in a new reactor pressure vessel without providing a temporary opening on the roof of the reactor building, and the temporary opening of the roof that has been conventionally required. It is not necessary to set a large reinforcing material for the part or to support the roof with a temporary pillar. In addition, it becomes unnecessary to prepare a large lifting machine that can be carried in and out beyond the roof of the reactor building, which has been conventionally required.

  A first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an old reactor pressure vessel 1 according to the present embodiment without providing a temporary opening on the roof of the reactor building 18 and without installing a large lifting machine outside the reactor building 18. 1 is a cross-sectional view of an embodiment of a method for carrying out a reactor building 18. The procedure for carrying out the old reactor pressure vessel 1 according to the present embodiment will be described with reference to FIG.

  (1) The old reactor pressure vessel 1 is in a state in which the reactor pressure vessel 1 is lifted upward by cutting the pipes connected to the reactor pressure vessel 1 as preparation before carrying out.

  (2) The lifting equipment 3 for assembling the reactor pressure vessel 1 is assembled on the fuel operation floor 2. The lifting equipment 3 is assembled in the shape of a tower on the upper part of the reactor pressure vessel 1, and is supported from the fuel operation floor 2 by, for example, four pillars. The lifting equipment 3 has a lifting device at the top of the tower.

  The lifting device is selected based on the restriction on the distance between the lifting equipment 3 and the roof of the reactor building 18. If the interval is wide, it is conceivable to install a wire hoisting device (not shown) having a motor generally used for a traverse crane. In recent years, a center hole jack mechanism (not shown) that is used for lifting and hanging large equipment may be installed. If the interval is narrow, only a pulley is installed on the top of the lifting equipment 3, a wire hoisting device is installed on the fuel operation floor 2, and the reactor pressure is controlled by operating the hoisting / lowering of the wire. The container 1 can also be lifted / suspended.

  (3) After installing the lifting equipment 3 on the fuel operation floor 2, the old reactor pressure vessel 1 is lifted. The reactor pressure vessel 1 is lifted up to the fuel operation floor 2. Although the reactor pressure vessel 1 has an upper lid, the upper lid has a hemispherical shape like a bowl, and the following needs to be taken into consideration when the reactor pressure vessel 1 is lifted.

  That is, when the reactor pressure vessel 1 can be carried out with the upper lid attached to the reactor pressure vessel 1 due to the restriction with the roof of the reactor building 18 when the reactor pressure vessel 1 is lifted, When interference with the roof of the building 18 occurs, the top lid may be removed, and a flat plate-shaped closed lid may be attached and carried out. FIG. 1 shows a case where a flat lid 4 is attached and carried out. When the reactor pressure vessel 1 is lifted by a wire depending on the type of lifting device installed in the lifting equipment 3, it may be lifted by a center hole jack.

  (4) The reactor pressure vessel 1 is lifted to about 50 cm to 100 cm on the fuel operation floor 2 by the lifting equipment 3. With the reactor pressure vessel 1 suspended, a cradle for receiving the lower end of the reactor pressure vessel 1 and a slide device 5 for sliding the cradle horizontally are installed below the reactor pressure vessel 1. . The slide device 5 may be a trolley-like device with wheels running on a rail, or may be a simple laying roller.

  (5) At the stage where the cradle and the slide device 5 have been set at the lower part of the reactor pressure vessel 1, the reactor pressure vessel 1 in a lifted state is suspended, and the lower end of the reactor pressure vessel 1 is Put on the cradle. In a state where the reactor pressure vessel 1 is placed on the cradle, the reactor pressure vessel 1 is further suspended and the slide device 5 is slid sideways from the center of the lifting equipment 3 toward the outside. By performing such an operation, the reactor pressure vessel 1 can be gradually tilted with the cradle serving as a fulcrum and finally brought to a sideways state. Before the reactor pressure vessel 1 is completely laid down, the cradle and the slide device 5 are installed at the lower part of the body of the reactor pressure vessel 1 in an appropriate place, and the reactor pressure vessel 1 that is laid down It is assumed that it is received by multiple cradle. When the reactor pressure vessel 1 is completely laid down and received by the cradle, the reactor pressure vessel 1 is disconnected from the wire of the lifting device of the lifting equipment 3 or the center hole jack.

  (6) The temporary opening 6 is provided on the side wall of the fuel operation floor of the reactor building 18. Since the wall is made of reinforced concrete, the temporary opening 6 can be provided by hanging concrete and cutting the reinforcing bar. Moreover, the provisional opening 6 can be provided by applying a reinforced concrete cutting technique using a wire saw or a water jet. In any method, even if the temporary opening 6 is provided in the wall, the roof of the reactor building 18 is sufficiently supported by other pillars and walls, so that the roof of the reactor building 18 collapses. There is no need to install reinforcements.

  (7) The jack frame 7 for assembling the reactor pressure vessel 1 to the ground level is assembled outside the reactor building 18. The above-ground is the height at which the reactor pressure vessel 1 can be transported to a storage by a method such as vehicle or roller pulling. The fuel operation floor 2 is often located at a height of about 20 m to 30 m above the ground, and the jack frame 7 from the level of the fuel operation floor 2 to the ground is assembled. The jack frame 7 is generally used for raising and lowering heavy equipment, and is composed of pillar / beam members and a stage.

  Since the components of the jack frame 7 are assembled by divided members, a small lifting machine such as a general wrecker is sufficient as the lifting machine for assembly, and a wide site is not required for assembly. . In addition, the foundation of the jack frame 7 requires a solid ground only for the pillar foundation part, and it is necessary to construct a concrete foundation. For example, in the case of four pillars, 2m squares in four places What is necessary is to build a concrete foundation of the degree.

  (8) The reactor pressure vessel 1 laid down on the fuel operation floor 2 is slid in a state of being placed on the cradle and the slide device 5 and passes through the temporary opening 6 provided on the wall of the reactor building 18. Then, it is moved to the stage of the jack frame 7 installed outdoors. The reactor pressure vessel 1 is activated by the fission reaction during operation, and if it is left as it is, there is a concern about exposure to workers and the influence on the surrounding environment, so a shield 8 is attached. The shielding body may be anything as long as it shields radiation. For example, an iron plate or the like is used to wind the reactor pressure vessel 1. This shielding body may be attached on the fuel operation floor 2.

  (9) The stage on which the reactor pressure vessel 1 is placed is lowered to the ground using the jack frame 7. A jack mechanism is installed on the pillar of the jack frame 7, and the stage can be gradually lowered to the ground by the mechanism.

  (10) Prepare a vehicle for transporting the reactor pressure vessel 1 on the ground, slide the reactor pressure vessel 1 lowered to the ground onto the vehicle and load it, and store the reactor pressure vessel 1 Remove to location. Further, if it is possible to construct a storage of the reactor pressure vessel 1 in the vicinity of the reactor building 18, the reactor can be brought into the storage by using a method such as roller drawing without being loaded on the vehicle. The pressure vessel 1 can be moved and stored as it is. Further, if there is a hill 9 or the like in the vicinity of the reactor building 18 as the storage, the tunnel 10 may be provided on the hill 9 and the reactor pressure vessel 1 may be moved and stored therein. FIG. 1 shows an image of this mine storage system.

  The old reactor pressure vessel 1 can be carried out by the above method. Among the above procedures, (6) and (7) can be performed before the procedure of (1) or in parallel with (1) to (5) from the viewpoint of shortening the construction period.

Next, a method for carrying a new reactor pressure vessel 1 into the building will be described. Carrying in the new reactor pressure vessel 1 is performed in the reverse order of the method of carrying out the old reactor pressure vessel 1. Ie:
(1) The new reactor pressure vessel 1 is loaded on a transport vehicle in a state of being laid down on a cradle and transported to the front of the jack frame 7. The reactor pressure vessel 1 is moved from the vehicle onto the stage of the jack frame 7 by roller drawing or the like. A slide device 5 is installed on the stage in advance, and a cradle for the reactor pressure vessel 1 is placed on the slide device 5.

  (2) The stage on which the reactor pressure vessel 1 is mounted is raised to the fuel operation floor 2 level using the jack frame 7. A jack mechanism is installed on the pillar of the jack frame 7, and the stage can be gradually raised to the fuel operation floor 2 level by the mechanism.

  (3) The reactor pressure vessel 1 is slid in a state where it is placed on the cradle and the slide device 5, passes through the temporary opening 6 provided in the wall of the reactor building 18, and is moved on the fuel operation.

  (4) The reactor pressure vessel 1 is slid to the location of the lifting equipment 3 installed on the fuel operation floor 2 and connected to the lifting device of the lifting equipment 3. The reactor pressure vessel 1 is lifted by the lifting device, and the slide device 5 on which the cradle of the reactor pressure vessel 1 is mounted is slid sideways toward the center of the lifting equipment 3. By performing such an operation, the reactor pressure vessel 1 can be gradually lifted obliquely with the cradle at the lower end of the reactor pressure vessel 1 as a fulcrum, and can finally be in an upright state.

  (5) The reactor pressure vessel 1 is lifted up to about 50 cm to 100 cm above the fuel operation floor 2 by the lifting device of the lifting equipment 3. With the reactor pressure vessel 1 suspended, the cradle for receiving the lower end of the reactor pressure vessel 1 installed under the reactor pressure vessel 1 and the slide device 5 are removed.

  (6) The reactor pressure vessel 1 is suspended by the lifting equipment 3 and installed at a predetermined position where the old reactor pressure vessel 1 was installed.

  (7) The lifting equipment 3 installed on the fuel operation floor 2 is dismantled and the temporary opening 6 provided in the wall of the reactor building 18 is restored. Also, the outdoor jack frame 7 is dismantled and removed. Since the dismantling of the jack frame 7 is disassembled into divided members, it can be carried out with a small hoist such as a tow truck as in the case of assembling, so a large site is not required.

  Next, a second embodiment of the present invention will be described with reference to FIGS. Here, parts that are the same as or similar to those in FIG. FIG. 2 shows that the old reactor pressure vessel 1 of the present embodiment is installed without providing the temporary opening 6 on the roof of the reactor building 18 and installing a large lifting machine outside the reactor building 18. FIG. 5 is a cross-sectional view of an embodiment of a method for carrying out the reactor building 18 using the equipment temporary storage pool. FIG. 3 is a plan view of the fuel operation floor 2 of the reactor building 18.

  In the first embodiment, the reactor pressure vessel 1 lifted by the lifting equipment installed on the fuel operation floor 2 interferes with the roof of the reactor building 18 with the axis of the reactor pressure vessel 1 upright. This is an embodiment when not. The second embodiment is an embodiment where interference occurs on the roof of the reactor building 18 when the reactor pressure vessel 1 is lifted in the first embodiment.

  A temporary equipment pool 11 is installed on the fuel operation floor 2. The equipment temporary storage pool 11 is a pool for temporarily storing a steam dryer and a moisture separator housed in the reactor pressure vessel 1 during normal operation during periodic inspection. This equipment temporary pool 11 is connected to the reactor well pool at the top of the reactor pressure vessel 1.

  A procedure for carrying out the old reactor pressure vessel 1 according to the present embodiment will be described.

  (1) The old reactor pressure vessel 1 is in a state in which the reactor pressure vessel 1 is lifted upward by cutting the pipes connected to the reactor pressure vessel 1 as preparation before carrying out.

  (2) Assembling a lifting equipment for lifting the reactor pressure vessel 1 on the fuel operation floor 2. Two lifting equipment are assembled. One is assembled at the top of the reactor pressure vessel 1 (referred to as lifting equipment 3A), and the other is assembled at the top of the equipment temporary pool 11 (referred to as lifting equipment 3B). These lifting equipments 3A and 3B are assembled in a tower shape, and are supported from the fuel operation floor 2 by, for example, four pillars. Each of the two lifting equipments 3A, 3B has a lifting device at the top of the tower.

  (3) After installing the lifting equipment 3A, 3B on the fuel operation floor 2, the old reactor pressure vessel 1 is lifted. Lifting is performed in two parts. That is, lifting up to the equipment temporary pool floor 12 and lifting up to the fuel operation floor 2. First, the reactor pressure vessel 1 is lifted to a height of about 3 m above the level of the equipment temporary pool floor 12 by the lifting equipment 3A.

  With the reactor pressure vessel 1 suspended, a cradle for receiving the lower end of the reactor pressure vessel 1 and a slide device 5 for sliding the cradle horizontally are installed below the reactor pressure vessel 1. . The slide device 5 may be a trolley-like device with wheels running on a rail, or may be a simple laying roller. Between the reactor well pool 13 and the equipment temporary pool 11 from which the reactor pressure vessel 1 is lifted, there is a pool gate stand having a height of about 2 m. Therefore, the slide device 5 exceeds the pool gate stand 14. It is necessary to set the height to be set.

  (4) At the stage where the cradle and the slide device 5 have been set at the lower part of the reactor pressure vessel 1, the reactor pressure vessel 1 in a suspended state is suspended, and the lower end of the reactor pressure vessel 1 is Put on the cradle. In a state where the reactor pressure vessel 1 is placed on the cradle, the reactor pressure vessel 1 is further suspended and the slide device 5 is slid sideways from the center of the lifting equipment 3A toward the outside. By performing such an operation, the reactor pressure vessel 1 can be gradually inclined with the cradle as a fulcrum. When the size of the equipment temporary pool 11 is large, the reactor pressure vessel 1 can be completely laid down in the equipment temporary pool 11.

  FIG. 2 shows the reactor pressure vessel 1 in an inclined form. In the state where the reactor pressure vessel 1 is tilted or laid down, the lower part of the reactor pressure vessel 1 is prepared to be lifted by the lifting device of the lifting equipment 3B. This is performed by attaching a hanging ear or trunnion to the lower part of the reactor pressure vessel 1 and connecting a wire or a center hole jack of a lifting device of the lifting equipment 3B thereto. In this stage, the reactor pressure vessel 1 is lifted up to the fuel operation floor 2. This lifts the reactor pressure vessel 1 in an inclined or sideways state by simultaneously lifting and lifting the lifting devices of the lifting equipment 3A and 3B.

  (5) The reactor pressure vessel 1 is lifted up to about 50 cm to 100 cm above the fuel operation floor 2 by the lifting equipment 3A, 3B. With the reactor pressure vessel 1 suspended, a cradle for receiving the lower end of the reactor pressure vessel 1 and a slide device 5 for sliding the cradle horizontally are installed below the reactor pressure vessel 1. . The slide device 5 may be a trolley-like device with wheels running on a rail, or may be a simple laying roller.

  (6) At the stage where the cradle and the slide device 5 have been set at the lower part of the reactor pressure vessel 1, the reactor pressure vessel 1 in a suspended state is suspended, and the lower end of the reactor pressure vessel 1 is Put on the cradle. When the reactor pressure vessel 1 is in an oblique state, the reactor pressure vessel 1 is suspended on the cradle with the reactor pressure vessel 1 being suspended by the lifting equipment 3A, 3B and the slide device 5 is lifted up. Slide laterally from the center of 3A, 3B outward. By performing such an operation, the reactor pressure vessel 1 can be gradually inclined with the cradle as a fulcrum, and finally can be in a laid-down state.

  Before the reactor pressure vessel 1 is completely laid down, the cradle and the slide device 5 are installed at the lower part of the body of the reactor pressure vessel 1 in an appropriate place, and the reactor pressure vessel 1 that is laid down It is assumed that it is received by multiple cradle. When the reactor pressure vessel 1 is completely laid down and received by the cradle, the reactor pressure vessel 1 is disconnected from the lifting device 3A, 3B lifting device wire or center hole jack.

  The subsequent steps are the same as those in the first embodiment.

  The old reactor pressure vessel 1 can be carried out by the above method.

Next, a method for carrying the new reactor pressure vessel 1 into the building in the second embodiment will be described. The new reactor pressure vessel 1 is carried in by the reverse procedure of the method of unloading the old reactor pressure vessel 1. Ie:
(1) The new reactor pressure vessel 1 is loaded on a transport vehicle in a state of being laid down on a cradle and transported to the front of the jack frame 7. The reactor pressure vessel 1 is moved from the vehicle onto the stage of the jack frame 7 by roller drawing or the like. A slide device 5 is installed on the stage in advance, and a cradle for the reactor pressure vessel 1 is placed on the slide device 5.

  (2) The stage on which the reactor pressure vessel 1 is mounted is raised to the fuel operation floor 2 level using the jack frame 7. A jack mechanism is installed on the pillar of the jack frame 7, and the stage can be gradually raised to the fuel operation floor 2 level by the jack mechanism.

  (3) The reactor pressure vessel 1 is slid in a state of being placed on the cradle and the slide device 5 and moved onto the fuel operation floor 2 through the temporary opening 6 provided in the wall of the reactor building 18. .

  (4) The reactor pressure vessel 1 is slid to the location of the lifting equipment 3A, 3B installed on the fuel operation floor 2 and connected to the lifting device of each lifting equipment 3A, 3B. That is, the upper part of the reactor pressure vessel 1 is connected to the lifting device of the lifting equipment 3A, and the lower part of the reactor pressure vessel 1 is connected to the lifting device of the lifting equipment 3B. In the new reactor pressure vessel 1, suspension ears, trunnions, etc. are attached to the upper and lower portions of the reactor pressure vessel 1 in advance so that they can be connected to the lifting devices of two lifting equipments. .

  (5) The reactor pressure vessel 1 is lifted up to about 50 cm to 100 cm on the fuel operation floor 2. The reactor pressure vessel 1 is lifted horizontally by the lifting devices of both the lifting equipments 3A and 3B while the reactor pressure vessel 1 is laid sideways. With the reactor pressure vessel 1 being lifted in this way, the cradle and the slide device 5 installed under the reactor pressure vessel 1 are removed.

  (6) The upper part of the reactor pressure vessel 1 is lifted by the lifting device of the lifting equipment 3A, and the lower part of the reactor pressure vessel 1 is suspended by the lifting device of the lifting equipment 3B. From a horizontal state to an oblique state.

  (7) The reactor pressure vessel 1 is suspended to the equipment temporary pool floor 12 by maintaining the oblique state and simultaneously operating the lifting devices of the lifting equipment 3A, 3B. On the equipment temporary pool floor 12, a cradle for receiving the lower end of the reactor pressure vessel 1 installed when the old reactor pressure vessel 1 is carried out, and a slide device for sliding the cradle horizontally 5 is left as it is. The lower end of the new reactor pressure vessel 1 that has been suspended obliquely is received by the cradle. At the stage where the lower end of the reactor pressure vessel 1 is received by the cradle, the reactor pressure vessel 1 and the wire of the lifting device of the lifting equipment 3B or the center hole jack are separated.

  (8) The reactor pressure vessel 1 is lifted by the lifting device of the lifting equipment 3A, and the slide device 5 on which the cradle of the reactor pressure vessel 1 is placed is slid sideways toward the center of the lifting equipment 3A. . By performing such an operation, the reactor pressure vessel 1 can be gradually lifted obliquely with the cradle at the lower end of the reactor pressure vessel 1 as a fulcrum, and can finally be in an upright state.

  (9) The reactor pressure vessel 1 is lifted up to about 50 cm to 100 cm on the slide device 5 by the lifting device of the lifting equipment 3A. With the reactor pressure vessel 1 suspended, the cradle for receiving the lower end of the reactor pressure vessel 1 installed under the reactor pressure vessel 1 and the slide device 5 are removed.

  (10) The reactor pressure vessel 1 is suspended by the lifting equipment 3A and installed at a predetermined position where the old reactor pressure vessel 1 was installed.

  (11) The lifting equipment 3A, 3B installed on the fuel operation floor 2 is dismantled and the temporary opening 6 provided in the wall of the reactor building 18 is restored. Also, the outdoor jack frame 7 is dismantled and removed. Since the dismantling of the jack frame 7 is disassembled into divided members, it can be carried out with a small hoist such as a tow truck as in the case of assembling, so a large site is not required.

  According to the embodiment described above, it is not necessary to secure a site necessary for operating a large lifting machine or to remove or relocate a part of outdoor equipment that interferes with the operating site. . In addition, it is not necessary to construct the ground required for the site where the large lifting machine operates. In addition, it is not necessary to secure a large site for assembly and disassembly of the lifter itself, which is required by a large lifter.

About carrying out of the old nuclear reactor pressure vessel which is the 1st Embodiment of this invention, it is shown in procedure by the sectional elevation view including a reactor building. About carrying out of the old nuclear reactor pressure vessel which is the 2nd Embodiment of this invention, it is shown procedurally in the sectional elevation view including a reactor building. It is a top view of the fuel operation floor of the reactor building in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Reactor pressure vessel 2 ... Fuel operation floor 3 ... Lifting equipment 4 ... Closure lid 5 ... Slide apparatus 6 ... Temporary opening 7 ... Jack frame 8 ... Shield body 9 ... Hill 10 ... Tunnel 11 ... Equipment temporary pool 12 ... Equipment temporary pool floor 13 ... Reactor well pool 14 ... Pool gate stand 18 ... Reactor building

Claims (7)

In the reactor pressure vessel unloading method of unloading the reactor pressure vessel from the reactor building containing the reactor pressure vessel,
Providing a temporary opening on the side wall of the fuel operation floor of the reactor building;
Unloading the reactor pressure vessel through the temporary opening;
A reactor pressure vessel carrying-out method characterized by comprising: A step of installing a jack frame outside the reactor building;
A descent step of lowering the reactor pressure vessel carried out from the temporary opening to the ground by the jack frame in a state of lying down;
The reactor pressure vessel carrying-out method according to claim 1, wherein   Before unloading the reactor pressure vessel through the temporary opening, having the step of lifting the reactor pressure vessel obliquely or lying on the fuel operation floor in the equipment temporary pool inside the reactor building The method of carrying out a reactor pressure vessel according to claim 1 or 2.   4. The reactor pressure vessel unloading according to claim 2, further comprising a step of transporting the reactor pressure vessel lowered to the ground by the jack frame to a storage near the reactor building in a state of being laid down as it is. Method. In the reactor pressure vessel carrying-in method of carrying in a new reactor pressure vessel into the reactor building after carrying out the existing reactor pressure vessel from the reactor building,
A reactor pressure vessel loading method, wherein the reactor pressure vessel is loaded through a temporary opening provided in a side wall of a fuel operation floor of the reactor building.   Before carrying in the reactor pressure vessel through the temporary opening, it has a step of raising the new reactor pressure vessel to the height of the temporary opening by a jack frame installed outside the reactor building. The method for carrying in a reactor pressure vessel according to claim 5.   Reactor pressure vessel carrying-in, characterized in that it has a step of hanging the reactor pressure vessel from an oblique upright state in the equipment temporary pool after suspending the reactor pressure vessel through the temporary opening Method.

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