Spent nuclear fuel storage module

FIELD: handling spent nuclear fuel.

SUBSTANCE: proposed module designed for storage of spent nuclear fuel has tight case with inner space to receive spent nuclear fuel. Module is provided with ring made of solid ferromagnetic material possessing magnetocaloric properties. Ring is provided with drive and is free to rotate about its axis. It is disposed so that part of this ring is inside module in immediate proximity of tight tank holding spent nuclear fuel. Other part of ring is placed in constant magnetic field outside of module and can be cooled.

EFFECT: enhanced safety of spent nuclear fuel dry storage.

1 cl, 2 dwg

 

The invention relates to the field of nuclear energy, including equipment, containers and storage facilities for spent nuclear fuel (SNF).

Known storage for dry long-term storage of SNF. They are storage facilities for special sealed canisters or containers having an internal closed cavity for the location of the spent fuel, the heat from the canisters or containers is given by natural convection. For example, see "Nuclear technology abroad", No. 9, 1998, p.3.

However, such storage and containers are not sufficiently resistant to overheating during storage of high level waste.

The known device intensification of heat from the modules storage of SNF, including those based on the use of circulating fluid.

However, storage of spent fuel in water is limited corrosion resistance of the membranes of the fuel element.

The present invention is to improve the safety of dry storage of spent nuclear fuel at extremely high ambient temperatures.

Solved this problem so that the private module having an internal cavity to accommodate the spent fuel is supplied endless band or ring or multiple rings of rigid material with the possibility of finding a part of the ring inside the module in close proximity to the tanks containing the fuel, and on the ugogo part of the same ring on the outside of the module and with the possibility of rotation of the ring. The ring is equipped with a drive for rotation. The outer parts of the rings may optionally intensively cooled, for example by a stream of air.

Rings can be made of a ferromagnetic material, having a magnetocaloric effect. In the immediate vicinity of the outer parts of the rings are permanent magnets which generate a magnetic field, which are the outer parts of the rings.

Figure 1 shows the module storage of spent fuel with a ferromagnetic ring, intensifying the heat transfer figure 2 - cross section along a-a in figure 1.

A module for storing SNF includes a housing 1 located in the inner cavity of spent fuel assemblies 2, ring of ferromagnetic material 3 is located partially inside the housing 1, between the ring 3 and the housing 1 has a seal 4. The outer part of the ring 3 is covered by the poles of the permanent magnet 5. The actuator 6 is able to move the ring around its axis and provided with a motor (not shown). Spent fuel assemblies 2 are enclosed within an additional sealed enclosure 7.

The module operates storage of SNF in the following way. Driven by a motor actuator 6 causes the ring 3 into rotation around its own axis. When this heated inside the body 1 side of the ring 3 through the seal 4 is moved to the outside and get in a magnetic the OLE, created by the permanent magnet 5. Since the ring is made of a ferromagnetic material, having a magnetocaloric effect, such as gadolinium, when you hit the part of the ring in a constant magnetic field, this part several optional heated and gives off more heat to an external fluid, such as air, or gives off heat by radiation. Leaving the magnetic field generated by the permanent magnet 5, the portion of the ring 3 in the magnetocaloric effect is cooled, which further enhances the forced cooling of spent fuel.

Module storage of spent nuclear fuel containing a closed housing having an internal cavity to accommodate spent nuclear fuel, characterized in that it has a ring of solid ferromagnetic material, having a magnetocaloric properties, with the possibility of rotation of the ring about its axis and provided with a drive located so that the portion of the ring is inside a module in the immediate vicinity of the containers, in which spent nuclear fuel, and another part of the same ring on the outside of the module, the outer part of the ring is in a constant magnetic field generated by the permanent magnet, and has an opportunity to cool.



 

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