DE7828992U1 - SHIELD CONTAINER FOR THE TRANSPORT AND / OR STORAGE OF BURNED FUEL ELEMENTS - Google Patents

Description

11 1111

in ι ι ι iii

1111 II

- 2nd

TRANSNUKLEAtt GmbH

6450 Hanau 11

Shielding container for transport and / or for Spent fuel storage.

The innovation relates to a container construction for shielded containers for transport and / or storage spent fuel, essentially consisting of a jacket, a bottom and one on the jacket flanged cover.

For the transport and storage of spent fuel elements from no reactors you need containers that safely enclose the radioactivity of the goods and shield the radioactive radiation released during the decay from the outside. They must therefore be robust and be built with thick walls.

At the same time, however, the containers must also reliably discharge the decay heat released to the outside can derive. The spent fuel is therefore generally made in baskets in the cask Good heat-conducting material is used to also remove the internal heat from the fuel elements in the middle

t I I t

• I · I · 1 I

° To be able to deduce the positions of the containers on the inside wall of the container. This also requires the
To keep the gap between basket and container very small,
in order to prevent heat build-up in this air gap, which is a poor conductor of heat. The inside dimensions of the f containers are therefore subject to very tight tolerances.

The containers must also have nuclear technology

The usual smooth, gap-free and corrosion-resistant |

have inner surface that can be cleaned and T

Decontamination of the emptied container allows.

The J.

t generally meet this requirement. They are mostly f

made of a forged steel jacket with a welded
on

Floor made. Their inner surface is norma- |

Usually stainless steel plated. These containers have | I

however, the disadvantage that their production is very time-consuming |

ύ is complex and expensive. what their use specifically as |

Makes storage containers uneconomical. I.

J For this reason, container designs have already been proposed which can be manufactured more quickly and cheaply can be. That's the way it is. For example, known from DE-GM 7728331 I, the container made of spherical cast iron
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or cast steel directly with the cast base

and a corrosion-resistant inner lining
Apply galvanometallic layer.

In this type of manufacture, however, the
Inner dimensions correspond to the tolerances customary in casting.
Subsequent processing to the required

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I 1 I I *

tight tolerance egg? is due to the shape of the fuel assemblies given container length with an already molded base is only possible with a great deal of effort.

It was therefore the task of the present innovation, one To create shielding containers for the transport and / or storage of spent fuel assemblies, consisting essentially of a shell, a base and a 'flanged to the shell cover, which the high precision of the well-known forged steel tanks and the cost-effective production of the well-known Cast container united. In particular, the interior of the container should be easy to rework despite the large length of the container be.

According to the innovation, this task was solved by that the bottom is screwed into the jacket.

Figure I shows schematically in an exemplary embodiment a longitudinal section of a screening container according to the invention. It consists of an initially Jacket pipe (1) open at the top and bottom, a bottom screwed into it at the bottom (2) and one at the top flanged cover (3). The jacket tube (l) is preferably made of cast steel or cast iron in full Cylindrical length of the finished container cast. The interior can then be cleaned with the usual tools machined from both sides to the required tight tolerances. Only then will the Screwed in the bottom (2) and fastened the cover (3).

both of which are also preferably made of cast steel or cast iron.

c When using unalloyed cast steel, the interior the shielding container in the same way as with the previously known transport containers with no problems Stainless steel lined. Ausserdeni can before Screw in the cast base (2) a thin noble

iQ steel floor gap-free with the stainless steel lining ver be welded. This results in a smooth, gap-free and decontaminable surface that meets all requirements inner surface. When using alloy cast steel, an inner lining can be omitted if the

] * j machined inner surface with the usual in the art Procedure is smoothed out so that they. is equivalent to a stainless steel-lined surface and when the screwed-in base is welded to the jacket without any gaps on the inside.

20th

The shielding container according to the innovation has opposite

the previously oekannten containers au advantage * f he the ho / le precision of the internal dimensions of the shipping container made of forged steel currently in operation and cost effective and rapid production \ transport and / or storage container made of cast steel ·

or cast iron combined.

30th

irankfurt / Main, 27.y.I97S
Dr.Br.-Bi

Claims (3)

992. 78176 KT TRANSNÜKLEAR GmbH 6 ^ 50 Hanau 11 Shielding containers for the transport and / or storage of spent fuel elements. · PROTECTION CLAIMS 1. Shielding container for the transport and / or storage of spent fuel assemblies, essentially consisting of a jacket, a base and a cover flanged to the jacket, characterized in that the base (2) is screwed into the jacket (l). 30th 2. shielding container according to claim 1, characterized draws that one or more of the single parts (1,2,3) are made of cast iron or cast steel, 3. shielding container according to claims 1 and 2, characterized in that the inner walls of the individual parts (1,2,3) are lined with stainless steel. _ 2 -