JPH102994A - Structure of cooling storage management facility for radioactive waste - Google Patents

Abstract

(57) [Summary] PROBLEM TO BE SOLVED: To make it possible to support ventilation pipes without using a support structure, to increase the arrangement density of the housing pipes, to reduce the size of storage facilities, and to store the same in storage facilities of the same area. The provision of a radioactive waste cooling and storage management facility structure that can increase construction costs and reduce construction costs. SOLUTION: Adjacent ventilation pipes 10 are connected to each other to form a ventilation pipe aggregate structure 100, and this ventilation pipe structure 1
00 is configured to be supported and disposed in the storage pit by the support member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of inserting a vitrified material or the like obtained by mixing radioactive waste generated in a reprocessing plant for spent nuclear fuel with glass into a vertically disposed storage tube. The present invention relates to a cooling storage management facility structure for radioactive waste that is cooled and stored for a predetermined period.

[0002]

2. Description of the Related Art Highly radioactive wastes such as fission products separated by reprocessing of spent nuclear fuel are mixed with glass to generate radiation and heat, and filled and sealed in a container called a canister. It is made into vitrified material, cooled and stored for several years until the temperature falls below a predetermined temperature in a dedicated radioactive waste management facility, and then subjected to final geological disposal.

FIG. 7 shows a conceptual configuration diagram, FIG. 8 shows a cross-sectional view (plan view) of an example of a storage pit, and FIG. 9 shows a longitudinal section thereof. As shown in the plan view, a plurality of housing pipes 2 for housing a plurality of vitrified bodies 4 in series are arranged at predetermined intervals in a storage pit 1 through which air can flow.

The storage pipe 2 has a ventilation pipe 2B supported by a side wall 1B of the storage pit 1 via a support structure 3 outside the storage pipe 2A suspended and supported by a ceiling slab 1A of the storage pit 1. It has a double structure concentrically extrapolated,
The vitrified body 3 that is radioactive waste is stored in the storage tube 2A, and cooling air flows through the space between the inner peripheral surface of the ventilation tube 2B and the outer peripheral surface of the storage tube 2A.

[0005] Thus, the heat of the vitrified body 4 warms the air in the space between the inner peripheral surface of the ventilation tube 2B and the outer peripheral surface of the storage tube 2A via the storage tube 2A, and the heated air is converted into the space. By rising in the inside, natural ventilation is provided, and the vitrified body 4 and the cooling air do not come into direct contact with each other.

[0006]

In the above-mentioned conventional radioactive waste cooling and storage management facility, the ventilation pipe 2B
Are supported by the support structure 3 at the lower part and the intermediate part of the storage pit 1, respectively.

As shown in FIG. 8, the supporting structure 3 is made up of a cross-section steel 3A vertically and horizontally between the side walls 1B of the storage pit 1 in a grid pattern. And is supported by being joined to a section steel 3A adjacent to the outer periphery thereof by a joining member 3B.

As a result of such a support structure for the ventilation pipe 2B,
The arrangement interval of the housing pipes 2 is regulated by the support structure 3, and there is a problem that the storage density cannot be enhanced to a predetermined level or more.

That is, by increasing the arrangement density of the housing pipes 2, it is possible to reduce the size of the storage facility and increase the amount of storage in the storage facility having the same area. It was a blocking factor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to support a ventilation tube without using a support structure, and to increase the arrangement density of storage tubes so that a storage facility can be provided. An object of the present invention is to provide a radioactive waste cooling and storage management facility structure capable of reducing the size and increasing the amount of storage in a storage facility of the same area and reducing the construction cost.

[0011]

The radioactive waste cooling and storage management facility structure which achieves the above object is characterized in that a plurality of storage pipes each having a storage pipe inserted in a ventilation pipe are vertically arranged in a storage pit. The radioactive waste is stored in the storage pipe, and the cooling and storage facility for radioactive waste is configured so that cooling air flows between the outer peripheral surface of the storage pipe and the inner peripheral surface of the ventilation pipe. In the above structure, a ventilating pipe aggregate structure in which the adjacent ventilating pipes are joined to each other is formed, and the ventilating pipe aggregate structure is supported and arranged in the storage pit.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view conceptually showing an arrangement structure of ventilation pipes in a structure for cooling and storing radioactive waste according to the present invention.

In the illustrated arrangement structure, the individual ventilation pipes 10 are arranged such that the outer peripheral surfaces of the adjacent ventilation pipes are in contact with each other.
They are joined at their contact portions to form an integrated ventilation tube assembly 100 as a whole.

The ventilation tube 10 has a cylindrical shape having a predetermined inner and outer diameter capable of housing the storage tubes 20 at predetermined intervals as shown by an imaginary line in FIG. 2 which is an enlarged sectional view. A steady rest 11 for regulating the horizontal position of the storage tube 20 is fixedly provided on the inner peripheral surface thereof, and the outer peripheral surface is in contact with the adjacent ventilation pipe 10 ', and FIG. Are connected by a bonding structure.

The steady rest 11 is a plate having a predetermined thickness, and is disposed along the longitudinal direction at four locations which divide the circumferential direction of the ventilation tube 10 into four parts, and has a width (height). Is set so as to have a predetermined gap with the outer surface of the storage tube 20 to be inserted (that is, so as not to always contact).

As shown in FIG. 3, the ventilation pipes 10 are connected to the pipe walls of the ventilation pipes 10 and 10 'to be connected by connecting holes 10A and 10A having predetermined diameters formed around a line connecting the centers of the two. 10A 'is formed, and the coupling holes 10A, 10A are formed.
A cylindrical connecting plug member 12, which is thinner than the combined wall thickness of both ventilation pipes 10, 10 ', is inserted into A', and the outer peripheral edge of the end face of the connecting plug 12 and the connecting hole 10A,
This is performed by fixing the inner peripheral surface of 10A 'to the inner peripheral surface by spot welding, and such a connecting structure is provided at two locations in the longitudinal direction and connected.

The ventilation pipe assembly 100 constructed as described above, as shown in a conceptual vertical sectional view of a storage pit in a storage pit 1 of a radioactive waste cooling and storage management facility, has a bottom portion as shown in FIG. The support tube 30 is supported at a predetermined height by the support member 30, and the outermost ventilation tube 10 is supported on the side wall 1B of the storage pit 1 by the support member 30 at two locations in the longitudinal direction (overall height direction). Will be arranged.
The storage tubes 20 are inserted into the respective ventilation tubes 10.

As described above, the ventilation pipes 10 are connected to each other on their peripheral side surfaces to form a ventilation pipe assembly 100, and the ventilation pipe assembly 100 is connected to the storage pit 1 via the support member 30. With the configuration disposed at the predetermined position, the ventilation tubes 10 can be disposed at the minimum interval without being restricted by the support structure as in the conventional configuration in which the individual ventilation tubes 10 are supported by the support structure, Therefore, the arrangement density can be set to the maximum. As a result, if the storage capacity is constant, the size of the cooling storage management facility can be reduced, and if the storage facility has the same area, the storage capacity can be increased. In addition, since a large supporting structure is not required, the construction cost can be reduced.

In the above configuration example, the ventilation pipes 10 are arranged such that the centers of the ventilation pipes 10 are located on vertical and horizontal lines orthogonal to each other. However, the arrangement of the ventilation pipes 10 is not limited to this.
As shown in FIG. 5, it can be changed as appropriate, such as arranging in a staggered manner. Further, the outer surface of the ventilation tube 10 does not necessarily have to directly contact, but may be connected via a connecting member having a predetermined thickness. Further, the connecting structure is not limited to this configuration example. Not something.

As a method of forming the ventilation pipe assembly structure 100, instead of connecting tubular members (ventilation pipes), as shown in FIG. 6, a space-shaped member 40 surrounded by ventilation pipes is combined. Alternatively, the ventilation pipe assembly may be formed by combining tubular members (ventilation pipes) divided in the circumferential direction.

Further, in the above configuration example, the steady rest 1 for restricting the horizontal amplitude of the storage tube 20 is provided on the inner peripheral surface of the ventilation tube 10.
1 is fixedly arranged, but a steady rest may be fixedly arranged on the outer peripheral surface of the storage tube 20, so that the effect of increasing the surface area of the storage tube 20 and promoting heat dissipation can be obtained. It is something that can be done.

[0022]

As described above, according to the structure of the facility for cooling and storing radioactive waste according to the present invention, the ventilation pipe aggregate structure formed in a shape in which the adjacent ventilation pipes are connected to each other is stored. By being supported in the pit,
The ventilation pipes can be arranged at minimum intervals without being restricted by the support structure as in the conventional configuration in which the individual ventilation pipes are supported by the support structure, and therefore, the arrangement density of the housing pipes can be maximized. Can be set. This makes it possible to reduce the size of the cooling storage management facility if the storage capacity is constant, and to increase the storage capacity if the storage facility has the same area, making it a reasonable cooling storage management facility. It is. In addition, since a large supporting structure is not required, the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view conceptually showing an arrangement structure of a ventilation pipe in a radioactive waste cooling and storage management facility structure according to the present invention.

FIG. 2 is an enlarged sectional view of a ventilation pipe.

FIG. 3 is an enlarged cross-sectional view of a connection portion of a ventilation tube.

FIG. 4 is a schematic vertical sectional view of a storage pit.

FIG. 5 is a view showing another arrangement structure of the ventilation pipe.

FIG. 6 is a diagram showing another method of forming the ventilation tube assembly.

FIG. 7 is a conceptual configuration diagram of a management facility for cooling and storing radioactive waste as a conventional example.

FIG. 8 is a cross-sectional view of an example of a conventional storage pit.

FIG. 9 is a longitudinal sectional view of an example of a conventional storage pit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage pit 10 Ventilation pipe 20 Storage pipe 100 Ventilation pipe aggregate structure

Claims (1)

[Claims] A plurality of storage pipes each having a storage pipe inserted in a ventilation pipe are arranged vertically in a storage pit, and radioactive waste is stored in the storage pipe and an outer periphery of the storage pipe. In a cooling and storage facility for radioactive waste configured to allow cooling air to flow between a surface and an inner peripheral surface of the ventilation tube, a ventilation tube assembly having a shape in which the adjacent ventilation tubes are joined to each other is provided. A cooling storage management facility for radioactive waste, wherein the structure is formed and the ventilation pipe assembly is supported and disposed in the storage pit.