JPS63121791A - Housing for nuclear reactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) 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furnaces that have become unusable due to an accident, and furnaces that have not yet reached their design life but are outdated and have low power generation capacity.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 buildings that take into consideration the disposal of reactors that need to be replaced.

(Conventional technology) Decontamination is essential in building demolition and removal 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 activated 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 above conventional technology, the nuclear fuel is extracted from the reactor and the nuclear fission reaction is prevented from occurring, and then decontamination and dismantling are carried out after a period of about five years, which reduces the construction period. In addition to the length of the project, it was hoped that the site would be reused, 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 a nuclear reactor building that has reached the end of its lifespan without waiting for the decontamination period, and to easily reuse the site of a nuclear reactor. The aim is to provide a nuclear reactor building that will become possible.

(Means for Solving the Problems) In order to achieve the above object, a nuclear reactor building according to the present invention includes an upper base plate integrally supporting the reactor building;
A lower foundation plate constructed on the foundation rock, a column erected on the lower foundation plate to leave enough height between the lower foundation plate and the upper foundation plate to allow the carriage to fit, and a column between the top of the column and the upper foundation plate. It consists of a seismic isolation device that is removably installed between the pillars, and a track for running the bogie prepared in advance between the supports.The reactor building is placed on the bogie that runs on the track, and the bogie is run. The upper foundation plate is connected and fixed to the lower foundation plate using a seismic isolation device.

(Operation/Operation) During decommissioning, a trolley is run on the track and placed between the upper and lower foundation plates of the building to jack up the reactor building. Next, a removal jig is placed between the trolley and the upper foundation plate, the jack is lowered, the trolley is moved, and the reactor building is removed from the lower foundation plate. The connection between the seismic isolation device and the reactor building is bolted, so it can be easily removed.

Next, after replacing the seismic isolation device, run the trolley carrying the new reactor building, align the upper foundation plate again with the replaced seismic isolation device on the lower foundation plate of the light, and place the new reactor building on the seismic isolation device. to be fixed.

The old reactor building will not affect the operation of the new reactor building in any way, so it is best to take the appropriate amount of time to ensure that it is dismantled and removed.

(Embodiments) 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 in the reactor building of the present invention, a reactor building 2 including a reactor containment vessel 1 is integrally constructed with an upper base plate 3. Supports 6 are erected at regular intervals on a lower foundation plate 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 this 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 base plate 3, it is fixed to the lower base plate 5 via a seismic isolation device.

In the figure, a large number of tracks 8 are installed in parallel in one direction, and 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, the seismic isolation laminated rubber support 4
While loosening the bolts at the upper end, a jack 9 is installed between the columns 6 and 6, and the upper base plate 3 is removed from the seismic isolation laminated rubber support 4 while jacking up the reactor building 2. Then, the trolley 7 is moved under the upper base plate 3 by running on the track 8, and the transport jig is placed between the upper base plate 3 and the trolley 7 to jack it down, and the reactor building 2 is placed on the trolley 7. .

By moving the cart 7 as it is, the transportation of the reactor building 2 is completed.

Next, the seismic isolation laminated rubber bearing 4 may be removed from the support column 6 and replaced with a new seismic isolation laminated rubber bearing 4. Then, the new reactor building is carried on the trolley 7 to the conventional lower base plate 5. After jacking up the reactor building with jacks 9 and moving the trolley 7 outside, jack it down and place the reactor building on the laminated rubber bearings 4, and connect the laminated rubber bearings 4 and the upper base plate 3 with bolts. Just connect them.

(Effects) As described in detail above, according to the nuclear reactor building according to the present invention, the upper foundation plate supporting the reactor building and the lower foundation plate on the foundation rock are connected by a seismic isolation device. The base plate structure allows the reactor building and the lower base plate to be separated at the seismic isolation device. In addition, between the lower foundation plate and the upper foundation plate, a space with a height sufficient for the carriage to fit is provided by the pillars, and a track for the carriage to run is provided between the pillars. It is easy to jack up and run the trolley.

Furthermore, since the entire reactor building can be moved in this way, the site of the decommissioned reactor can be reused as is, and there is no need for a sealed management period for decommissioning, 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 Figure 2 from a different direction. FIG. 1... Reactor containment vessel 2... Reactor building 3...
... Upper foundation plate 4 ... 1 ... Seismic isolation laminated rubber bearing 5 ... ... Lower foundation plate 6 ...
・・Support 7・・・・Bolly 8・・・・
・・・・・・Trajectory 9・・・Jatsuki

Claims (1)

[Claims] An upper foundation slab that integrally supports the reactor building, a lower foundation slab constructed on the foundation rock, and a height sufficient to accommodate a trolley between the lower foundation slab and the upper foundation slab. A column erected on the lower foundation plate, a seismic isolation device removably installed between the top of the column and the upper foundation plate, and a track for bogie running prepared in advance between the column and the column. The reactor building is placed on a trolley that runs on the track, the trolley is run to move and convey it freely on the lower foundation slab, and the upper foundation slab is placed on the lower foundation slab. A nuclear reactor building characterized by being connected and fixed by a device.