DE3507503A1 - CONTAINERS FOR TRANSPORTING RADIOACTIVE SUBSTANCES - Google Patents

Description

COKTADER FOR TRAKSPORT "RADIOACTIYER ST0JP3

The invention relates to a container for transporting radioactive substances Substance which is formed by a housing that is closed on all sides with one outer and one outer an inner plate existing housing is provided, wherein the plates are arranged spatially separated from one another. The container according to the invention is particularly useful for transport of waste products from the atoa industry, burnt-out fuel elements and other similar substances suitable for high security requirements.

When using radioactive substances in technological processes and to collect residual radiation or any that have arisen For radioactive waste it is necessary to use containers to carry out the transport. These containers have in ab-

A 3206-1641 / NB

Dependence on the state, the nuclide composition, the amount and the other parameters of the substances and radiation very diverse building areas.

In addition, these containers are subject to high requirements if they are classified in increased security categories to ensure security, which has to be proven by tests, among other things.

The great diversity of conditions led to diverse ones Types of construction without a clear group formation being possible. Often the massive construction is used, where- with e.g. to improve the heat transfer, the corrosion protection, radiation shielding and to achieve other effects additional layers made of different materials on the inside or outside of the solid container wall can be ordered. *

For example, G3-PS 1 311 069 describes a transport container described, its massive ". '." and made of a TTerkstoff high density for the shielding of the gamma rays and a thin layer of a hydrogenous material for the heutron separation.

The DB-OS 30 12 256 shows a transport container ait one massive Strahlabgchirawand that both inside and the outside is covered with layers of neutron-absorbing and corrosion-resistant materials.

GB-PS 1 220 027, US-P3 3 731 102 and DS-OS 28 17 193 each represent transport containers for radioak * ¹ · "· Tea material in which the massive radiation abachira layer for technological reasons is in front of an inner and

nea outer jacket of another material is included, with no connection between the individual layers consists.

In DE-OS 3 04 758 a transport container is disclosed, this wall made up of several ... transparent layers of different types 7 / materials is formed, whereby the ' Layers from the outside to the inside in the electrochemical series become more and more noble. 3 in this 3 container exists in each case no connection between the individual layers.

Usually the massive construction results from the necessary radiation shielding for strong emitters. These containers then usually have good puncture resistance, but have poor damping properties in the event of an accident and are partially sensitive to the effect of? your.

Other conditions apply to containers for radioactive Large volume residues with medium radiation levels. For shielding reasons, these containers could be lighter built, i.e. the walls are thinner. The small 7 / andthicken such containers are, however, to a large extent through octagonal loading, as with the drop test on one Thorn set, prone to puncture, so that the possibility of reduction cannot be exploited and the massive construction must nevertheless be applied.

The production of transport containers of massive construction is associated with a high use of valuable materials and requires complex manufacturing processes and equipment.

The invention was given the purpose of a container

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for the transport of radioactive substances, in addition to a material-saving and manufacturing-technically simple construction high securitynoroati.te met.

The knowledge underlying the invention is that when synthetic resins are used, a construction is possible where the materials are connected and therefore the safety parameters are significantly improved in all designs can be.

The task is therefore to develop a container, the high puncture resistance, good energy adsorption behavior, resistance to fire effects and sufficient Radiation shielding combined.

To achieve the object, a radioactive for transporting substances intended container has been prepared, the closed on all sides, has a, from an inner 31ech and one of them at a distance from the separated outer 31ech shaped housing, wherein erfindungSoeoiäß between the outer and inner sheets one as a Mixture of a synthetic resin and a hard granular filler, which is cast in a plastic state, and the middle layer is provided. 56 is selected, with the remainder consisting of the filler, which for example is formed by quartz sand with a grain size of 0.1 to 0.4 ma, the fraction 0.3 mn often occurring. The composition of the middle layer / the type and amount of both synthetic resin and filler / is determined by

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Dea is selected depending on the intended use of the container. In its plastic state, the substance is appropriately trained Openings made in the space between the outer and inner sheets and cured. After curing, the Openings are closed.

Ba iat expediently on those bordering the middle class Surfaces of both the outer and inner 31echa to apply a synthetic resin film, the base material of which with the in the synthetic resin used is identical or compatible with the middle layer. This allows better adhesion between the middle layer and the sheets are guaranteed and with thinner sheets there is the advantage that their permeability is reduced compared to various substances.

It can also be an advantageous training, elements to ensure the distance between the sheets. This is particularly desirable for sheets with a horizontal arrangement, where first the mixture of the middle layer is eaten on the lower 31eche, which is then covered with the upper 31eche will.

It is also advantageous to use plate-like vertical elements in the vertical parts of the housing, whereby in it parts of smaller volumes arise and the introduction of the plastic mass of the middle class, as well as the distribution whose will be facilitated.

The main advantages of the invention are that through the combination of different synthetic resins and hard fillers, / such as quartz, boron carbide or metal balls / a large range of variation is available, which means very

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τerachiedene radiation physics, mechanical and manufacturing technology Requirements considered and in accordance can be brought. The advantages of the construction consist in the fact that the synthetically developed, The layer that can be glued or glued to the inside of the sheet metal creates a high-strength shell that is much better Has properties than an equivalent steel layer of the same class. It is also advantageous that the inventive Containers against massive bodies with the highest loads, -as determined with the 9 m-Pall test, more deformable and thus better protect the tightness and integrity of the load without the need for expensive shock absorbers required are. The effort involved in dividing up the containers can be reduced considerably compared to other types. Overall, in cheaper ', Yeise economic and security stechniache Combined advantages.

The invention is further illustrated by way of example Embodiments shown in more detail, reference being made to the accompanying drawings. In the drawing shows the only one

Figure shows the cross section of the container according to the invention with a enlarged section of his land structure.

The container /Fig./ according to the invention is one off all side closed housing formed, which consists of a shell 1, a cover 2 and bottom 11, wherein. the The cover 2 and the base 11 are connected to the casing 1 by screws · The mentioned parts of the housing are made of one inner sheet 5 and an outer 31ech 6 built, the one-

Determine an inner free space, as it is at a distance from each other are arranged. The jacket 1 has a bottom flange 3 and an upper surface 4. The price space between the inner one Sheet 5 and the outer sheet 6 is filled by a middle layer 7, which consists of a synthetic resin filler mixture and is poured in in a plastic state. The composition of the mixture varies depending on the purpose of the container according to the invention.

The cover 2 consists of two 3-way discs 8, a ring of the middle layer 7, which is enclosed between the 31 cochlear discs 8 is. One of the sheet metal disks 8 as the lower sheet metal as the inner sheet 5 and the other as the upper sheet the outer sheet 6 forms. The bottom 11 is designed similarly.

The middle layer 7 is directly or by a. Kunstharzfila IO with the inner and outer 31eches 5.6 permanent glued. The synthetic resin film is advantageously made of the same synthetic resin in a known "" iron, z.3. by painting or Spray applied, which ia synthetic resin filler mixture was used.

The selection of the layer thickness and material components of the Synthetic resin filler Seaisches for the middle layer 7 is made by Invoices from the given data of the substances as well as the necessary The parameters of the housing of the container are determined and practically verified through experiments on models. The mixture for the middle layer 7 of the container, the recipes determined are put together, mixed and processed in a known manner placed in the plastic state in the given free spaces of the shell 1, the lid 2 and the bottom. Ia case of

Sheath 1 can also facilitate the introduction by vertical plates will. In the case of the cover 2 and base 11, the plastic material of the middle layer 7 is poured onto the lower sheet metal and then the top sheet can be placed. Spacer plates can be used to prevent the plastic mixture from being squeezed out be used. The vertical plates and the spacer plates play an insignificant role in the guarantee the mechanical strength of the container, they must not necessarily be able to bear loads greater than the weight of the sheet metal.

The middle layer 7 is directly or over the synthetic resin film 10 sticks to the inner walls and cures them at a rate that depends on the temperature and composition the end. If necessary, curing can be accelerated by heat treatment / increasing the temperature. To the Introducing the substance of the middle layer 7, filling openings can be provided, which after curing with an additional Ring or filler can be veneered.

The choice of synthetic resin and hard granular filler always depends on the task at hand. Using a middle layer 7 targeted certain recipe and density eowie by inner and outer sheets 5 _f 6 necessary density are several requirements which are placed on the container, at the same time be fulfilled. 3a is particularly advantageous that relatively thin steel sheets can be processed, the additional strengths that are required to prevent puncture injuries to the inner wall, with the middle layer 7 made of synthetic resin filler

substance mixture can be achieved, which is therefore particularly advantageous is because it is not only filled in, but also glued to the inner surfaces of the surrounding walls. Partial injuries to the outer steel jacket also mean nothing particular problem because there is no loss of the middle layer 7 due to the sticking and hardening of the mixture the injuries can come. By choosing different synthetic resins and fillers / types of gravel / it is possible to consciously special types of radiation / z, 3. Neutrons / preferably to absorb and to achieve insulation in the event of fire.

The improved energy absorption behavior should also be emphasized e.g. in the 9m drop test, which leads to a reduction in the impact forces and consequently to greater protection of the Container cargo leads.

The production process is positively influenced because the filling of the plastic mixture also in complicated shapes can be done. It is also advantageous that the amount of material for steel is lowered. This causes a decrease in hatred, and it also affects the cost of transportation.

Claims (6)

PATENT CLAIMS 1. Container for the transport of radioactive substances, the one closed on all sides, formed from an inner sheet and an outer sheet separated from it at a distance Has housing, characterized in that between the inner 31ech / 5 / and the outer sheet / 6 / a as a mixture A middle layer consisting of a synthetic resin and a hard granular filler and cast in a plastic state / 7 / is seen. 2. Container according to claim 1, characterized in that on the middle layer / 7 / delimiting surfaces of the inner Sheet metal / 5 / and the outer 31echs / 6 / a synthetic resin fil / 10 / is applied. 3. Container according to claim 2, characterized in that der Kunstharzfila / 10 / formed from an identical or compatible synthetic resin used with dea in the middle layer / 7 / is. * 4. Container according to one of claims 1 to 3, characterized in that that between the inner 31ech / 5 / and the outer 31ech / 6 / spacer plates are provided. 5. Container according to one of claims 1 to 4, characterized in that that the housing in its vertical parts between the inner sheet metal / 5 / and the outer sheet metal / 6 / plates having. 6. Container according to one of claims 1 to 5, characterized in that the middle layer / 7 / contains 10 to 30 % synthetic resin.