RU146486U1 - HEXAGON PIPE FOR TRANSPORTATION AND STORAGE OF WASTE NUCLEAR FUEL - Google Patents

Abstract

1. A hexagonal tube for transporting and storing spent nuclear fuel, made of a flexible sheet of boron steel with the joint of the joined edges along the length of the pipe, characterized in that the joint of the joined edges is filled with fired neutron-absorbing ceramics containing 20-55 wt.% Boron carbide particles of size 20-80 μm. 2. A hexagonal pipe according to claim 1, characterized in that the joint is made with narrow-slot cutting of edges with a slit width of 2-10 mm. 3. A hexagonal pipe according to claim 1, characterized in that the joint is made in the middle of one of the faces parallel to its edge or between adjacent faces. A hexagonal pipe according to claim 1, characterized in that on the inner side of the pipe between the edges are lintels made of carbon steel 1.0-1.5 mm long with a distance between them of 50-80 mm.

Description

The utility model relates to the production of pipes, namely, to hexagonal pipes from boron steel with a boron content of 1.3-3.6% and are intended for the manufacture of devices for transporting and compacted storage of spent nuclear fuel.

Known hexagonal pipe made of boron steel for transportation and compacted storage of spent nuclear fuel, equipped with a weld obtained by laser welding, which is placed in the middle part of one of the faces of the pipe parallel to its edge. The hexagonal profile of the known pipe is obtained by a flexible sheet on a press brake with the formation of ribs and faces of the hexagonal pipe with the junction of the edges connected by laser welding along the length of the pipe in the middle of one of the pipe faces parallel to its edge.

(RU 21760, B21C 37/08, B21C 37/15, published 01/06/2012).

However, boron steels, in particular, steel grade ChS82 (04X14TER1F) with a boron content of 1.3-3.6 wt.% When welding extended welds are prone to cracking, both during welding and in the after-welding period, which limits them use for the manufacture of devices for transportation and compacted storage of spent nuclear fuel.

The objective and technical result of the utility model is to increase the operational properties of hexagonal pipes with the possibility of their manufacture without the use of welding operations.

The technical result is achieved by the fact that the hexagonal pipe for transportation and storage of spent nuclear fuel is made of a flexible sheet of boron steel with the joint of the joined edges along the length of the pipe, and the joint gap of the joined edges is filled with fired neutron-absorbing ceramics containing 20-55 wt.% Boron carbide particles the size of 20-80 microns.

The technical result is also achieved by the fact that the joint gap is made in the form of a narrow-slot cutting of edges with a slit width of 2-10 mm; the joint gap is made in the middle part of one of the faces parallel to its edge or at the junction of adjacent faces; on the inner side of the pipe between the edges are lintels made of carbon steel 1.0-1.5 mm long with a distance between them of 50-80 mm.

The utility model may be illustrated by an example using FIG. 1, where:

1 - a hexagonal pipe;

2 - joint of the joined edges;

3 - pipe edge;

4 - calcined neutron-absorbing ceramics;

5 - jumper made of carbon steel.

Getting pipes according to a utility model are as follows. A sheet of boron steel with a thickness of 6 ± 2.0 mm is bent on a bending press along the edges of the formed hexagonal pipe 1 to obtain a hexagonal profile of the pipe with an external "turnkey" size of 257 ± 2.0 mm. When bending the sheet, a minimum clearance of the joint 2 along the length of the pipe between the edges to be joined is achieved. After that, the edges are bred to the required size with the formation of a joint gap in the form of a narrow-slot cutting of the edges with a slit width of 2-10 mm. In addition, jumpers made of carbon steel 1.0-1.5 mm long with a distance between them of 50-80 mm are placed between the divorced edges on the inside of the pipe. Jumpers can be made both by welding, and in the form of inserts. The joint gap can be made in the middle part of one of the faces parallel to its edge or at the junction of adjacent faces.

Then the joint gap of the joined edges is filled with a composition to obtain a ceramic containing a neutron-absorbing component - 20-55 wt.% Boron carbide particles with a size of 20-80 microns. The basis of the composition for the production of neutron-absorbing ceramics can be any known composition, including borosilicate glasses and aluminosilicates as a binder. After that, drying is carried out at a temperature of no higher than + 50 ° C and the tube is fired at a temperature of 800-950 ° C with the formation of a joint gap of the joined pipe edges filled with calcined neutron-absorbing ceramics.

The presence of compressive forces at the junction of the pipe edges filled with calcined neutron-absorbing ceramics ensures the ceramic's resistance to mechanical stress and the achievement of the desired technical result: improving the operational properties of hexagonal pipes with the possibility of their manufacture without the use of welding operations.

Claims (4)

1. A hexagonal tube for transporting and storing spent nuclear fuel, made of a flexible sheet of boron steel with the joint of the joined edges along the length of the pipe, characterized in that the joint of the joined edges is filled with fired neutron-absorbing ceramics containing 20-55 wt.% Boron carbide particles of size 20-80 microns. 2. A hexagonal pipe according to claim 1, characterized in that the joint is made with narrow-slot cutting of edges with a slit width of 2-10 mm. 3. A hexagonal pipe according to claim 1, characterized in that the joint is made in the middle of one of the faces parallel to its edge or between adjacent faces. 4. A hexagonal pipe according to claim 1, characterized in that on the inner side of the pipe between the edges are lintels made of carbon steel 1.0-1.5 mm long with a distance between them of 50-80 mm.

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