DE8018596U1 - TRANSPORT AND / OR STORAGE CONTAINERS FOR RADIOACTIVE SUBSTANCES - Google Patents

Description

TRANSNUKLEAR GMBH 6A50 Hanau 11

TRANSPORT AND / OR STORAGE CONTAINERS FOR RADIOACTIVE SUBSTANCES

The present innovation relates to a transport and / or storage container for radioactive substances, the gamma and n radiation emit and generate residual heat, essentially consisting of a container body with a shielding function for gamma radiation, a neutron shield and cooling fins, the neutron shield is arranged as a shaped body between the web-shaped ribs.

Containers that are used for the transport and / or storage of radioactive substances, in particular also of spent fuel assemblies must contain the radioactivity of the material brought in safely and prove in strict tests that this is guaranteed even in extreme accident situations. Simultaneously but they also have to do with the radioactive decay reaction Shielding released gamma and neutron rays and the decay heat derive to the outside.

Known shielding containers usually consist of a metallic one Basic container with the required mechanical strength and the wall thickness required to shield the gamma rays, usually steel or a combination of lead and steel, and an outer shell made of neutron shielding material, usually in synthetic resin molded polyethylene beads. On the metallic body are usually thermally conductive, penetrating the resin layer Bars welded or soldered onto the ribs. They are required to enlarge the metallic surface of containers, which are designed for high heat output, and to dissipate

processing of heat through the generally poorly thermally conductive

Neutron shielding layer. ;

The disadvantage of these constructions is that even light packages | sions of the container, as they are also in routine operation ■

can occur, can also lead to damage to the resin layer and then make expensive repairs necessary. Further disadvantageous circumstances arise during cleaning and decontamination.

Another disadvantage of this known shielded container is;

in that the thickness of the neutron shield for the maximum to

Transport intended design case must be interpreted, so is not variable.

The same also applies to containers in which there are bores in the metallic Base body neutron absorbing material is housed.

Shielding containers are known from DE-GM 79 32 528 in which | ^;

the neutron shielding as an elastic molded body between the Bar-shaped cooling fins are attached. In some cases, however, there are difficulties in attachment and removal the shaped body.

It was the task of the present innovation, a container for radioactive Substances, essentially consisting of a container body with a shielding function for gamma radiation, a neutron shield and cooling fins, the neutron shielding being arranged as a shaped body between the web-shaped cooling fins, to be found at which the neutron shielding can be designed variably, furthermore test- and is easy to maintain, avoiding the described Disadvantages.

The object has been achieved according to the invention in that the molded body are composed of several parts.

Figure I and II, the new feature is explained in more detail schematically and in exemplary of example I type.

Between the cooling fins (1), which are located on the container body (2) with a shielding function for gamma radiation, molded bodies (9) made of neutron-absorbing material are arranged, according to the invention, and made of a plurality of individual parts (6, 7-8), which are easily exchangeable. The moldings (9) are secured by a suitable cover (5), which is held by lugs (3) to the cooling fins (1).

The shaped bodies (9) can have different shapes, gradations and sizes to have; they should only be able to be put together so closely to form an ensemble that the shielding effect is also effective against stray people Neutrons is sufficient.

The axial composition of the shaped bodies (9) is particularly advantageous, especially in the configuration of a central part (7) with a conical or parabolic cross-section and two identical side parts (6, 8). During assembly, the side parts (6, 8) are first positioned and then the cone-shaped and possibly also slightly convex central part (7) is inserted, the side parts being pressed against the container body (2) and under the lugs (3). Instead of a conventional cover, it is particularly advantageous to secure the molded body (9) with a resilient sheet metal (5) with a fold (h) and to maintain the contact pressure, the fold (4) in addition to its handling and clamping function is also effective as an additional mini cooling fin.

The dismantling of the shield according to the innovation is very simple; Tests, e.g. with ultrasound, are in principle also carried out on loaded ones Transport containers feasible.

Claims (3)

: kt 8o 203 TRANSNUKLEAR GMBH 6450 Hanau 11 Protection claims 1. Transport and / or storage containers for radioactive substances that emit gamma and η radiation and generate residual heat, essentially consisting of a container body with a shielding function for gamma radiation, a neutron shield and cooling fins, the neutron shield as a molded body between the bar-shaped is disposed ribs and covered characterized in that the shaped bodies (9) are composed of several parts. 2. Transport and / or storage container according to claim 1, characterized in that the individual parts of the molded body (9) are assembled axially. 3. transport and / or storage container according to claim 1 and 2, characterized in that the mold body (9) of a conical or parabolic in cross-section central portion (7) and two same side parts (6, 8). k. Transport and / or storage container according to claim 1 to 3, characterized in that the shaped bodies (9) are pressed by a resilient plate (5) with a rebate (k) to the container body (2).