JPS60205399A - Container for transporting radioactive substance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a specially constructed container for transporting radioactive materials. The container includes a housing that is circumferentially sealed by inner and outer metal plates, and the metal side plates are spaced apart from each other by spacing members. The container according to the invention is particularly suitable for transporting nuclear industrial waste, spent nuclear fuel and the like, and satisfies safety standards.

[Conventional technology]

Containers are generally used in the production process of radioactive materials and the removal of used isotopes or radioactive materials, and there are many types of container structures depending on the nuclide composition, amount, physical properties, and radiation.

Also, since this type of container belongs to the category of safety containers, it must meet certain increasingly strict special safety regulations and must therefore prove that it has undergone special tests.

There are so many different types of containers in use that they cannot be clearly classified due to the variety of usage conditions.

Bulky structures are used and additional layers of material are added to the interior and exterior panels of heavy duty containers to accommodate high heat, corrosion, radiation protection, and other requirements.

For example, the container disclosed in British Patent No. 1,311,069 has a multi-layered heavy wall consisting of a dense material for gamma radiation shielding and a thin layer of hydrogen-containing material for neutron shielding.

The container disclosed in German Patent No. 3,012,256 includes a bulky radiation-shielding wall surrounded by inner and outer layers of neutron-absorbing material and corrosion-resistant material.

British Patent No. 1220027, US Patent No. 373102
In the container for transporting radioactive materials disclosed in West German Patent No. 2,817,193, for technical reasons, a bulky radioactive shielding layer is surrounded by inner and outer parts made of different materials from the shielding layer without being connected to the shielding layer. ing.

The container walls disclosed in German Patent No. 3,047,458 are made of bulky layers of various materials.

These various materials are arranged in order of increasing potential from the outside to the inside. Individual layers are not connected.

Generally, bulky structures are due to radiation shielding requirements for safely transporting highly radioactive materials. Although containers of this type are less susceptible to punctures, they also have the disadvantage of poor damping properties should such an accident occur and are more susceptible to fire.

[Problem that the invention seeks to solve]

The conditions of use of containers for transporting large quantities of active media radioactive waste are extremely demanding. Containers of this type should be of lightweight construction, ie thin-walled.

However, thinning the walls of the container is extremely dangerous considering the presence of dotted holes, which must be confirmed by drop tests. Therefore, it has not been possible to make containers thinner, and in reality, bulky structures are used.

Manufacturing bulky containers consumes large amounts of valuable raw materials and requires sophisticated production technology and equipment.

The object of the invention is to provide a container suitable for the transport of radioactive materials, which is economical, easy to manufacture, of simple construction and which also achieves safety standards.

Another object of the present invention is to provide a container that is impervious, energy absorbing, fire retardant, and radiation protected.

[Means to solve the problem]

A container for transporting radioactive materials according to the present invention that solves the above problems has a housing that is circumferentially sealed by an inner plate and an outer plate separated from the inner plate by a filling spacing member. According to the invention, an intermediate layer is formed by filling the space between the inner plate and the outer plate with a mixture of synthetic resin and granular filler material in a plastic state.

The synthetic resin used is phenol/formic aldehyde, vinyl chloride, or epoxy material, and the volume ratio of the synthetic resin is 10 to 30 cm in the middle layer, and the remaining υ has a particle size of 0.1 to 0.
Preferably it is 4m fine quartz sand.

The surfaces of the inner and outer plates adjacent to the intermediate layer are coated with the same synthetic resin as that used for the intermediate layer or other synthetic resin compatible with the inner and outer plates, in order to reduce the permeability of certain substances. It is advantageous if a film of .

In particular, when the inner and outer plates are arranged horizontally during manufacturing and the plastic intermediate layer is poured onto one of the blade side plates and the other side plate is placed on top of it, the gap between the inner and outer plates is It is preferable to provide a spacing member.

Preferably, the vertical portion of the space defined by the inner and outer plates is divided into compartments to facilitate the manufacture of the plastic intermediate layer.

The components of the intermediate layer vary depending on the direction of use. The intermediate layer material in a plastic mixture is filled into the space between the inner and outer plates through appropriate filling holes, where it permanently adheres and hardens to the inner surfaces of both plates. Block the filling hole after solidification.

An advantage of the invention is that various synthetic resins and particulate materials, such as quartz, boron, carbide, metal spheres, can be matched to radiological, mechanical and engineering requirements.

Another advantage of the present invention is the strong enveloping property formed by the synthetic resin layer adhered to the inner surface of the side plate, which exhibits favorable properties even with an iron layer of the same mass.

Containers constructed according to the present invention have a high resistance to deformation even in bulky containers under high load conditions, as evidenced by a drop test from a height of 9 m.

Loads transported in containers can thus be better protected without the use of expensive shock-absorbing materials. The manufacturing costs of such containers are significantly lower than those of other constructions. As can be seen from the above, both the requirements of economy and safety are achieved by the container of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The feasibility of implementing the invention will be explained in more detail below with reference to the accompanying drawings, in which the implementation possibilities of the invention are shown by way of example.

〔Example〕

The container includes an outer shell 1, which includes a lid 2 and a bottom 11.
are bolted together. Attach the lower flank 4 to the outer shell 1. The entire wall is composed of an inner plate 5 and an outer plate 6.

The spaces created between the components of the shell 1 during the previous manufacture are used for pouring molds, into which an intermediate layer 7 of synthetic resin and hard granular material with compositions depending on the application is poured.

The lid 2 comprises two disks 8, a ring 9 and an intermediate layer 7 made of a mixture of synthetic resin and particulate material molded into the space defined by the members 8,9. The structure of the bottom 11 is also similar to that of the lid 2. One of the disks 8 constitutes the inner plate 5, and the other constitutes the outer plate 6.

The intermediate layer 7 consists of an inner plate 5 that has been preassembled during previous manufacturing.
and is joined to the outer plate 6 directly or via a synthetic resin film 10. The synthetic resin film 1o is preferably made of the same synthetic resin as that used for manufacturing the intermediate layer 7, and is preferably applied to the inner and outer panels by a known method such as spraying or painting.

Based on the knowledge of the components and properties of synthetic resins and granular materials and the characteristics required of the container, the thickness and constituent components of the intermediate layer 7 can be calculated using known calculations, and the usability of the data can be verified by model tests. Confirm by. The basic materials of the intermediate layer 7 are mixed and the above mixture is filled in a plastic state into the recesses formed between the inner plate 5 and the outer plate 6 of the outer shell 1, lid 2 and bottom 11. In the case of the outer shell 1, the filling operation is easy because it is composed of two vertical plates. In the case of the lid 2 and the bottom 11, synthetic resin is applied on the lower side plate, and the upper side plate is placed on top of the synthetic resin.

For this purpose, spacing plates are used. Vertical side plates and spacing plates are sufficiently far back if they are used only to maintain necessary spacing during assembly operations and do not need to withstand large stresses.

The intermediate layer 7 is bonded to the side plate surface directly or via the synthetic resin film 10, and cured for a predetermined time based on the temperature and components. This process can be sped up by increasing the temperature.

The synthetic resin and granular material must be selected depending on the intended use of the container. Moreover, by appropriately selecting the thicknesses of the inner and outer plates 5 and 6, several objectives can be achieved at the same time. It is preferable to use a thin steel plate with the necessary extra force to prevent the inner plate from being damaged by perforation and thus the intermediate layer 7 consisting of a mixture of synthetic resin and granular material. . Further, it is preferable that the intermediate layer is not only filled between the two side plates but also fixed to the inner plate. Even if the outer shell were partially damaged, it would not be a problem. If anything, the hardened intermediate layer 7 will not escape from the wall-like structure through such a break. Proper selection of synthetic resins and particulate materials can absorb certain types of radioactivity, such as neutron radiation, thus reducing fire accidents.

The containers of the present invention have excellent energy absorption properties (e.g. 9
(proven in a drop test from a height of m), thus reducing impact forces and providing high protection against container loads.

Manufacture is extremely easy since the synthetic resin mixture itself flows into a complex mold.

The construction described above is advantageous because it uses less steel, which reduces the weight of the container and thus reduces transportation costs.

[Brief explanation of drawings]

The figure shows a sectional view of a container according to the invention and an enlarged sectional view of the wall. 5... Inner plate, 6... Outer plate, 7... Intermediate layer, 9
... Spacing member, 10... Synthetic resin membrane. Patent Application Artificial Romues Harosattelheso Hararato (1 other person) Patent Application Agent Akira Aoki Patent Attorney Kazuyuki Nishidate Patent Attorney Kyosuke Nakayama Patent Attorney Akiyuki Yamaguchi Masaya Nishiyama Continuation of page 1 o Inventor Janos Inventor: Takatsu Föllenck, Inventor: Siegfried Sch Deutandke, Inventor: Rudolf Dielsi Douil, Inventor: Manfret Beis, Germany, 1163 Budapest, Lilafired Utsa, 1034 Budapest, Timal Uzza 51 Democratic Republic, 9200 Freiberg, Tschaikobusstrasse 87 Democratic Republic, 9200 Freiberg, Zurner
Schuese 4 Democratic Republic, 9200 Freibergtskal Kegeljutrasse 18/Koichi

Claims (1)

[Claims] 1. A radioactive material transfer container having a housing whose periphery is sealed by an inner plate and an outer plate separated from the inner plate by a spacing member, the inner plate (5) and the outer plate. (6) An intermediate layer formed by filling a mixture of synthetic resin and granular filling material in a plastic state (a container for transporting radioactive substances characterized by having strength). 2. Inner plate (5) ), the container according to claim 1, wherein a synthetic resin film 01 is formed on the interface between the outer plate (6) and the intermediate layer (7), covering the surface of the side plate.3. The container according to claim 2, wherein the container is made of the same synthetic resin material as that used for the intermediate layer (7).4. The container according to any one of claims 1 to 3, which is provided with a member.
%. The container according to any one of claims 1 to 4. 6. The container according to any one of claims 1 to 5, wherein the space between the inner plate (5) and the outer plate (6) in the vertical part of the housing is divided into several ways.