JP2002221595A - Storage facility for glass solidified body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a clearance flow passage width kept constant, and to shorten a term of work. SOLUTION: There are installed a storage pipe 1 for enclosing a glass solidified body CA, and a ventilation pipe AP for forming a clearance passage 6 with the pipe 1 therebetween. The storage pipe 1 and the ventilation pipe AP integrally fixed each other are suspended by fixing an upper end of the pipe 1 onto a ceiling wall 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vitrified waste storage facility for storing radioactive waste as a vitrified body for a predetermined period.

[0002]

2. Description of the Related Art A part of radioactive waste generated in a nuclear power plant and the like is mixed in a melting furnace together with glass having excellent heat resistance and radiation resistance and then poured into a metal container called a canister. By being hardened, it is processed into a vitrified body. Since the vitrified material itself generates heat due to the collapse of nuclear fuel, the vitrified material is stored for a predetermined period in a vitrified material storage facility for the purpose of cooling the heat.

A vitrified storage facility generally comprises a reinforced concrete building. As shown in FIGS. 3 and 4, a storage pipe containing a vitrified material CA in a storage area 51 defined by concrete walls 50. As shown in FIG. 4, a large number of 52 are arranged, and a so-called indirect natural air-cooled double-pipe system is used, in which a cooling gas (air) flows outside the storage pipe 52 (inside the ventilation pipe AP). . As shown in FIG. 5, the ventilation pipe AP has a support frame 5.
4, the upper end of the storage tube 52 is supported by the ceiling wall 55. Further, a concrete exhaust tower 53 called an exhaust shaft is provided so as to protrude at the upper part of the building so that the air flowing through the storage area 51 of the vitrified material is discharged to the outside through the exhaust tower 53. Has become.

[0004] The radioactivity of the vitrified material is stably confined by enclosing the vitrified material in a metal container (canister), and the vitrified material has a thick section defining a storage area 51 for the vitrified material. The radiation is shielded by the concrete wall 50. In a vitrified storage facility, these technologies have resulted in radiation doses from the facility that are well below the statutory dose limits.

[0005]

However, the conventional vitrified storage facility as described above has the following problems. The ventilation pipe AP is supported by a support frame 5 at the factory.
4 and the storage pipes 52 at the site
There is a problem that it takes a long construction time because it is inserted into the P. In addition, since the gap flow path between the ventilation pipe AP and the storage pipe 52 is made locally, it is difficult to maintain a constant gap flow path width, and much labor is required for adjustment.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide a vitrified storage facility capable of maintaining a constant gap flow width and contributing to shortening the construction period. And

[0007]

In order to achieve the above object, the present invention employs the following constitution. The vitrified material storage facility according to claim 1 is a vitrified material storage facility in which a storage pipe for storing a vitrified body and a ventilation pipe that forms a gap flow path between the storage pipe and the storage pipe are installed. The storage tube and the ventilation tube integrally fixed to each other are suspended with the upper end of the storage tube fixed to a ceiling wall.

Therefore, in the vitrified storage facility of the present invention, since the storage pipe and the ventilation pipe are integrally fixed, the width of the gap flow path can be kept constant without being affected by the on-site work. In addition, since the storage pipe and the ventilation pipe are integrally supported by the ceiling wall, there is no need to provide a frame for supporting the ventilation pipe, thereby shortening the construction period and reducing costs.

Further, the vitrified storage facility according to claim 2 is the same as the vitrified storage facility according to claim 1,
The lower end of the storage tube is slidably supported in the suspension direction.

Therefore, in the vitrified storage facility of the present invention, even if the storage tube expands and contracts in the suspension direction due to thermal expansion or the like, the supporting state of the storage tube can be maintained and the earthquake resistance can be enhanced. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vitrified material storage facility according to the present invention will be described below with reference to FIGS. In these figures, the same components as those in FIGS. 3 to 5 shown as conventional examples are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a cross-sectional view in which a storage pipe 1 and a ventilation pipe AP are installed in a storage area 51 of a vitrified storage facility. The storage area 51 is defined by concrete walls (a ceiling wall 55, a bottom wall 56, and side walls (not shown)). The vitrified material CA is sealed in a metal container called a canister, and is stored in the storage tube 1 via the receiving stand 2.

The storage tube 1 is vertically suspended by being held and fixed at its upper end by a through hole 8 formed in the ceiling wall 55, and a plug for preventing gas from flowing out from the storage tube 1. 3 is closed. At the lower end of the storage tube 1, a slide support column 4 extends in the vertical direction (the suspension direction). And, on the bottom wall 56, a support base 5 for supporting the slide support column 4 slidably in the vertical direction is installed.

On the other hand, the ventilation pipe AP is arranged around the outside of the storage pipe 1 to form a gap flow path 6 between the ventilation pipe AP and the storage pipe 1, and has protrusions 7 provided at both ends and substantially at the center. Are integrally fixed to the storage tube 1 by welding or the like. FIG.
As shown in (1), the projections 7 are annularly arranged at intervals of approximately 90 °, and the gap between these projections 7 secures the gap flow path 6. Further, by joining the protrusion 7 and the storage pipe 1, the storage pipe 1 and the ventilation pipe AP are fixed in a substantially concentric circle, that is, in a state in which the gap flow paths 6 are formed at equal intervals. The storage tube 1 and the ventilation tube AP are integrally fixed at a factory or the like before being installed in the vitrified storage facility.

[0015] In the vitrified material storage facility having the above structure,
After the air (outside air) flowing from the air supply port 11 shown in FIG. 3 rises through the gap flow path 6 between the storage pipe 1 and the ventilation pipe AP, it passes through an exhaust tower 53 called an exhaust shaft. The air is discharged from the exhaust port 12 to the outside. In addition, since a gap is formed between the projections 7 where the projections 7 are provided, the air flowing into the gap flow path 6 can rise without any trouble. The storage pipe 1 (that is, the vitrified body CA) is cooled by the air that flows in from the outside, and the air heated by the heat exchange at this time rises, thereby generating an airflow that flows through the facility.

In the vitrified storage facility according to the present embodiment, the storage tube 1 to which the ventilation pipe AP is fixed in advance is fixed to the ceiling wall 55 at the upper end and suspended, and supported at the lower end via the slide support column 4. Because it is supported by the table 4,
It is not necessary to provide a support frame for supporting the ventilation pipe AP, and it is possible to shorten the construction period and reduce the cost. In the present embodiment, the storage pipe 1 and the ventilation pipe AP
Are fixed in advance in advance, so that the width of the gap flow path 6 can be kept constant without being affected by the on-site work.

In addition, in the present embodiment, since the lower end of the storage tube 1 is supported by the bottom wall 56 via the slide support column 4 and the support base 5, even when vibration is applied, the storage tube 1 and The swing of the ventilation pipe AP can be prevented, and the earthquake resistance can be enhanced. Further, since the slide support column 4 is slidably supported, even if the storage tube 1 (and the ventilation tube AP) expands and contracts due to heat fluctuation, the support state can be maintained.

In the above embodiment, the slide support column 4 is provided on the storage tube 1. However, the present invention is not limited to this. For example, the slide support column 4 may be provided on the ventilation pipe AP. Also in this case, if the storage pipe 1 and the ventilation pipe AP are integrally fixed, the same operation and effect as described above can be obtained. In addition, the arrangement of the projections 7 provided at both ends and substantially at the center of the storage tube 1 may be mutually shifted in a plane. This case is preferable because the flow of air rising in the gap flow path 6 is disturbed and the cooling efficiency is increased.

[0019]

As described above, in the vitrified storage facility according to the first aspect, the storage pipe and the ventilation pipe integrally fixed to each other are suspended with the upper end of the storage pipe fixed to the ceiling wall. It has a configuration. As a result, in this vitrified waste storage facility, it is possible to keep the width of the gap flow channel constant without being affected by the on-site work, and it is not necessary to provide a support frame, shortening the construction period and reducing costs The effect that can be obtained is obtained.

A vitrified material storage facility according to claim 2 is
The lower end of the storage tube is slidably supported in the suspension direction. Thus, in the vitrified storage facility, even if the storage tube expands and contracts due to heat fluctuation, the support state can be maintained and the effect of improving the earthquake resistance can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, and is a cross-sectional view in which a storage pipe and a ventilation pipe are installed in a storage area.

FIG. 2 is a plan sectional view in which a storage tube and a ventilation tube are joined by a protrusion.

FIG. 3 is a perspective view showing a vitrified material storage facility.

FIG. 4 is a partial sectional view showing a storage pipe and a ventilation pipe in FIG.

FIG. 5 is a cross-sectional view in which a storage pipe and a ventilation pipe are supported by a conventional technique.

[Explanation of symbols]

 AP ventilation pipe CA vitrified body 1 storage pipe 6 gap flow path 55 ceiling wall

Claims (2)

[Claims] 1. A vitrified body storage facility in which a storage pipe for storing a vitrified body and a ventilation pipe forming a gap flow path between the storage pipe and the storage pipe are provided, wherein the vitrified body storage facility is integrally fixed to each other. A vitrified storage facility, wherein a storage pipe and the ventilation pipe are suspended with an upper end of the storage pipe fixed to a ceiling wall. 2. The vitrified material storage facility according to claim 1, wherein a lower end of the storage tube is slidably supported in the suspension direction.