JPH0455279B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention is applicable to furnaces that have reached the end of their design life, furnaces that have become unusable due to an accident, and furnaces that have not yet reached their design life but are outdated and have low power generation capacity. Reactor building structure that takes into consideration the disposal of reactors that need to be replaced.

<Conventional technology> Decontamination is essential for building demolition work associated with this type of decommissioning. However, the area surrounding the reactor core is exposed to neutrons emitted from the reactor during operation, and the area itself becomes radioactive.

Therefore, since radioactivity cannot be removed by decontamination alone, there is no other way than to cut and remove the radioactive parts.

The reactor core was removed and radioactive materials were completely eliminated, taking measures to reduce the exposure of workers, and then the building was demolished using standard construction methods.

<<Problems to be solved by the invention>> In the conventional technology described above, the nuclear fuel is extracted from the reactor and the nuclear fission reaction is prevented from occurring, followed by a decontamination period of approximately five years before dismantling and removal, which takes a long time. In addition, there was a desire to reuse the site, especially in Japan, where there is little land available.

The present invention was made in view of the circumstances described above, and its purpose is to transport and dispose of nuclear reactor buildings that have reached the end of their service life without waiting for the decontamination period, and to easily reuse the site of the reactor. The goal is to provide a reactor building structure that makes it possible.

<Means for Solving the Problems> In order to achieve the above object, the reactor building structure according to the present invention includes an upper foundation plate that is integral with the reactor building and supports it, and a lower part constructed on the foundation rock. A foundation, a column erected on the lower foundation to provide enough height for a cart to fit between the lower foundation and the upper foundation, and between the top of the column and the upper foundation. a seismic isolation device removably installed on the base; a vertically expandable jack for supporting the upper foundation from which the seismic isolation device has been removed on the lower foundation; A track for running a bogie extending between the supports, and a bogie for transporting an upper foundation plate supported by the jacks, which are provided on the track so as to be freely movable, and which are retracted. It is characterized by

<<Function>> To describe the function of the present invention, when removing a nuclear reactor building, first, a seismic isolation device that is removably installed between the top of the pillar installed on the lower foundation board and the upper foundation board is installed. At the same time as it is separated from the upper foundation board, the jack is extended upward and the upper foundation board is transferred from the seismic isolation device to the jack and supported. Next, the bogie is run on the track and inserted between the lower foundation plate and the upper foundation plate secured by the pillars. Thereafter, the jack is deflated, the upper foundation board is transferred from the jack to the cart, and the cart on which the upper foundation board is mounted is run on a track and transported to the outside of the lower foundation board.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The overall appearance is shown in FIG. 1, and the reactor building structure of the present invention is a reactor building 2 including a reactor containment vessel 1.
is constructed integrally with the upper foundation plate 3. Supports 6 are erected at regular intervals on a lower foundation slab 5 that is integral with the foundation rock that supports this building 2.

A track 8 on which a bogie runs is provided between these columns 6, which are arranged in an orderly manner at a constant distance. The height of the support column 6 may be set as long as it provides enough space for the carriage 7 to run.

In the reactor building 2, a seismic isolation laminated rubber support 4 is installed and fixed at the top of each support column 6 with bolts, an upper foundation plate 3 is placed on the laminated rubber support 4, and the upper end and upper part of the laminated rubber support 4 are attached with bolts. By tightly joining the foundation plate 3, it is fixed to the lower foundation plate 5 via a seismic isolation device.

In the figure, a large number of tracks 8 are installed in parallel facing in one direction, so that a large number of carts 7 can be used to withstand the weight of the reactor building 2.

For convenience of explanation, parts of the basic version will be outlined and explained in FIGS. 2 and 3.

When removing the reactor building 2, while loosening the bolts at the upper end of the seismic isolation laminated rubber support 4, remove the support column 6.
A jack 9 is installed between -6 and the upper foundation plate 3 is removed from the seismic isolation laminated rubber support 4 while jacking up the reactor building 2. Then, the cart 7 is moved under the upper foundation plate 3 by running on the track 8, and the transport jig is placed between the upper foundation plate 3 and the cart 7 to jack it down, and the reactor building 2 is placed on the cart 7. .
By moving the cart 7 as it is, the transportation of the reactor building 2 is completed.

For example, when constructing a new similar reactor building on the site where the old reactor building 2 was removed in this way, the seismic isolation laminated rubber support 4 is removed from the support 6,
All you have to do is replace it with a new seismic isolation laminated rubber bearing 4. Then, the new reactor building is carried on the trolley 7 to the conventional lower foundation plate 5. Jyatsuki 9
Then jack up the reactor building and move it to trolley 7.
After traveling to the outside, the reactor building is jacked down and placed on the laminated rubber bearing 4, and the laminated rubber bearing 4 and the upper foundation plate 3 are connected with bolts.

<<Effects>> As described in detail above, according to the reactor building structure according to the present invention, the upper foundation plate supporting the reactor building and the lower foundation plate on the foundation rock are removably connected by the seismic isolation device. Since it has a double foundation plate structure, the upper foundation plate and lower foundation plate on the reactor building side can be separated at the seismic isolation device. In addition, between the lower foundation plate and the upper foundation plate, there is a space with a height that is large enough for a trolley to fit through the pillars, and this makes it easy to jack up the upper foundation plate using jacks. The space and track make it easy for the cart to move.

Furthermore, since the entire reactor building can be moved in this way, the decommissioned reactor site can be reused as is, and there is no need to wait for the decommissioning sealing control period, which has the effect of significantly shortening the construction period.

[Brief explanation of the drawing]

Figure 1 is a side view of the reactor building and foundation, Figure 2 is a schematic side view to explain the relationship between the upper and lower foundation plates, and Figure 3 is a view of Figure 2 from a different direction. It is a schematic side view. 1...Reactor containment vessel, 2...Reactor building, 3
...Upper foundation plate, 4...Seismic isolation laminated rubber bearing, 5...
...Lower foundation plate, 6... Support, 7... Dolly, 8...
Orbit, 9...Jiyatsuki.

Claims (1)

[Claims] 1. To create a space between the upper foundation that integrally supports the reactor building, the lower foundation constructed on the foundation rock, and the lower foundation and the upper foundation so that a cart can fit there. A pillar erected on the lower foundation, a seismic isolation device removably installed between the top of the pillar and the upper foundation, and the upper foundation from which the seismic isolation device is removed are attached to the lower foundation. A jack that can be expanded and contracted in the vertical direction to support it on the board, a track for running the bogie that extends from outside the lower foundation board between the supports, and is provided on the track so that it can run freely and is retracted. A nuclear reactor building structure characterized by comprising a trolley on which an upper foundation board supported by the jacks is placed and conveyed.