SK279074B6 - Container's internal device for transport and storage of nuclear fuel - Google Patents

Abstract

Container's internal device consists of shells (1) in which external walls (2) adhere to each other. The fuel elements are stored in the shells. Longitudinal dovetail grooves (3) are formed in every external wall (2) of every shell (1), which bottom is made of longitudinal splines (30). A plate insertion (5) is inserted into both ends of a longitudinal dovetail groove (3) in which a V-shaped hole for an expanding wedge (6) is made. The absorption band (4) is inserted into longitudinal dovetail grooves (3) in between the plate insertions (5).

Description

Technical field

The invention relates to an internal container device for the transport and dry storage of fresh or spent fuel elements from nuclear reactors.

BACKGROUND OF THE INVENTION

There are known embodiments of an inner container device composed of four- or hexagonal bushings, coping with the necessary mounting clearance of the stored fuel elements, formed by welding the bores of stainless steel strips alloyed with boron, which by neutron absorption ensures the subcriticality of the fuel elements. Between these housings, usually longitudinal sheet metal strips of aluminum alloy or transverse plates with openings for individual housings are placed in order to distance their positions and dissipate residual heat.

With regard to production technology, i. j. pressing and welding, it is difficult to achieve the required accuracy when assembling the inner device in terms of its assembly into the container body itself, because here too, due to residual heat dissipation, a minimum clearance is required between the outer surface of the inner device and the inner surface of the container body. Embodiments are also known which use boron alloyed aluminum alloy to produce the sleeves. In this case there is no need for heat dissipating plates or plates as in the previous solution, but since boron does not dissolve in the aluminum alloy, it is very difficult from metallurgical point of view to achieve an even alloying of the aluminum alloy with boron necessary to ensure subcriticality of fuel cells. .

SUMMARY OF THE INVENTION

The above-mentioned disadvantages are substantially reduced by the internal nuclear fuel transport and storage container device composed of profiled sleeves abutting a portion of the outer wall, each sleeve surrounding at least one fuel cell and each outer sleeve side being shielded from the adjacent outer sleeve side by an absorbent strip. According to the invention of the inner container for nuclear fuel transport and storage, a longitudinal dovetail groove is formed in each outer wall of each housing, the bottom of which is provided with longitudinal protrusions and a flat insert equipped with a wedge hole is inserted into both ends of the longitudinal dovetail groove. which has an expanding wedge. Each absorbent strip is disposed in the space between the flat inserts in a longitudinal, groove-like groove between the flat protrusions, providing on each side a gap between the wall of the housing and the absorbent strip.

The advantage of the inner container device according to the invention is, thanks to the new design of the sleeves, the possibility to use cheap ones for the manufacture of sleeves, e.g. boron-free aluminum alloys and cheaper waste-free technologies, eg extrusion without requiring additional calibration and reducing the life of the mold by the abrasive effects of boron. This is made possible by virtually every wall of each housing being lined with an absorbent band, e.g. of stainless steel alloyed with boron at the optimum location in terms of utilizing its absorption properties.

The connection of the individual sleeves is mechanical, does not require welding, and due to the mutual contact between the sleeves, it is not necessary to use additional heat-conducting materials to remove residual heat.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an internal device of a container according to the invention, FIG. 2 is a longitudinal section through a dovetail groove with a flat insert and an expanding wedge; FIG. 3 shows a cross-section of a dovetail groove with an expanding wedge.

DETAILED DESCRIPTION OF THE INVENTION

The inner device of the nuclear fuel transport and storage container is folded according to FIG. 1 of a plurality of sleeves 1. The sleeves are hexagonal and their outer walls 2 abut against each other at the corners of the hexagon. In each outer wall 2 a longitudinal dovetail groove 3 is formed, the bottom of which is provided with a plurality of longitudinal protrusions 30. On these protrusions 30 the absorbent strip 4, which according to FIG. 2 and 3 in the longitudinal direction secured from both sides by flat inserts 5 inserted at each of the two ends of the longitudinal dovetail groove 3. Each flat inser 5 is provided with a wedge opening 50 for the expanding wedge 6, which in this case is also provided with a pull-out opening 60. threaded thread for unscrewed dismounting screw and locked in position by welding 70.

The inner device of the nuclear fuel transport and storage container is assembled so that between the individual sleeves 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, etc. The absorbent strips 4 are inserted successively and from both ends the flat inserts 5, which after insertion of the expansion wedge 6 connect the sleeves 1 to each other. The number and configuration of the provision of the sleeves 1 is practically arbitrary according to the size of the container.

Claims (1)

An internal nuclear fuel transport and storage container device comprising at least one set of sleeves abutting each other through the outer side walls, each sleeve surrounding at least one fuel cell, characterized in that in each outer wall (2) of each sleeve ( 1) a longitudinal dovetail groove (3) is formed, the bottom of which is provided with longitudinal projections (30), and a flat insert (5), equipped with a wedge opening (50) for expanding wedge, is inserted into each of the two ends of the longitudinal dovetail groove (3) (6), wherein an absorbent strip (4) is inserted between the flat inserts (5) in the longitudinal dovetail groove (3).