FR2615650A1 - CONTAINER ASSEMBLY FOR THE FINAL STORAGE OF RADIOACTIVE WASTE - Google Patents

Abstract

IN THIS CONTAINER CONSISTING OF AN INTERIOR ENCLOSURE 1 AND AN EXTERIOR ENCLOSURE 2 SEPARATED BY AN INTERCAL SPACE FILLED WITH A SEALING AND FILLING MATERIAL, ENCLOSURE 1, INCLUDING ITS BOTTOM 6 AND ITS COVER 7, IS FORMED BY THE MEETING OF SHIELDING PLATES 8 SHAPED BY CAST FROM RECYCLED SCRAP FROM NUCLEAR POWER PLANTS, TIGHTLY CONNECTED BETWEEN THEM AND DESIGNED ONLY TO ABSORB FILLING CONSTRAINTS, WHILE THIS INTERNAL ENCLOSURE BETWEEN 1 AS WELL AS EXCLUDING THE INTERIOR 2 BY FILLING AND SEALING CONCRETE 5 TO FORM A COMPOSITE CONTAINER SUPPORTING THE CONSTRAINTS OF TRANSPORTATION AND FINAL STORAGE. APPLICATION IN PARTICULAR TO FINAL STORAGE CONTAINERS OF RADIOACTIVE WASTE.

Description

The invention relates to a container assembly,

  consisting of an inner chamber and an outer chamber

  for the final disposal of radioactive waste, and in

  which an interspace separating is provided between the

  encircled inside and the outer enclosure, and in which

  a sealing filler material is poured into the

  between and around the radioactive waste in the

inside girdle.

  In known container assemblies of the type

  pe mentioned above, the inner speaker and the

  the outside are made of one-piece containers, even when equipped with a lid, which are

  consisting of, for example, a thick steel sheet, a piece of

  this of cast steel or the like. The inner chamber is a receptacle receiving the radioactive waste and is not for its part a container carrying a shield. -The prescribed shielding function is provided only by the complete assembly formed of the inner enclosure, the outer enclosure and

  filling and sealing material.

  Moreover, in nuclear power plants it appears

  large quantities of waste or scrap

  contaminated or weakly activated, which, from the point of view of radioactivity, are in the lower range of what may be permitted. Treatment of these substances

  radioactive waste is complex and expensive.

  That's why we use what we call recycling. Reuse in the industry is allowed without limitations

  important, with a corresponding purification. How-

  necessary provisions for purification are very

  ous. For this reason it has been proposed to use this material

  after a corresponding treatment (controls, purification, melting) as a basic material for equipment returning to nuclear power plants. This is particularly suitable for shielded storage containers for storing radioactive waste, since such shielded storage containers are placed in a final storage container, after having been

  filled with radioactive substances, and are therefore

  removed permanently from the life cycle. In general, high demands are placed on these containers with regard to the quality of the material, especially since they must simultaneously satisfy all the requirements from the point of view of the shielding technique and all the requirements from the point of view of solidity and stability. Similarly he can

  It is necessary to implement a high expenditure of exchange

  to remove by selection of non-suitable metals

  for example reducing stability. As part of

  In these provisions, there is initially no use of

  for unsuitable metals discarded by selection,

  such as nonferrous metals or alloy steels.

  The invention aims to create a container assembly having the constitution described and usable for the purpose described, and for the manufacture of which we can use scrap weakly contaminated or weakly activated

  from nuclear power plants, while eliminating

the problems described.

  This problem is solved according to the invention by virtue of the fact that the inner enclosure, including its bottom and its cover, is formed by the joining of shielding plates and / or shielding segments, which are formed by

  recycled scrap metal, in charge of a residential activity

  dual, from nuclear power plants and are assembled in a sealed manner without any slits, that the inner enclosure is designed to absorb only filling stresses and that the inner enclosure and

  the outer enclosure are joined by means of

  pleating and sealing having a corre-

  to form a composite container for absorbing

  the constraints of transport and final storage. accordance

  In a preferred embodiment, the assembly is

  so that the filling and sealing concrete is also arranged below the plates or segments

  from the bottom and above the plates or segments of the lid.

  It goes without saying that the armor plates or the segments of

  shielding are arranged and, where possible, normal

  so that they can be joined in sandstone fashion to form internal enclosures of any size

  and therefore container assemblies of one size

  any one, for example according to standards of units of

  final storage or corporate standards. Blister plates

  where the armor segments are still designed,

  point of view of their thickness, so as to achieve unique

  or essentially the protection from the waste

  radioactive substances which are introduced between these plates. The composition

  of the filling and sealing concrete is chosen according to the load constraints to be supported in relation to the mechanical strength and stability, but

  should always be adjusted to such a thickness as to

  for its part, at least a protection from access to

  the shielding plates or armor segments, since they were formed by casting recycled metal scrap

  contaminated with residual activity, originating from

nuclear.

  In detail, there is, within the framework of the

  tion, several possibilities for arranging and

  tions. Thus, a preferred embodiment of the invention is characterized by the fact that the radioactive waste is wrapped and sealed in the inner chamber with the same

  filling and sealing concrete than the one

  between the inner envelope and the outer envelope.

  In this case the plates forming lids or the segments

  lids of the inner chamber or even the

  or bottom segments of the inner enclosure have openings for the introduction of the filling and sealing concrete. It is within the scope of the invention to have an iron casing for concrete in the interspace between the inner chamber and the outer enclosure. The outer enclosure is made of

  in the manner of a container made of sheet steel without

  the closure made with the filling and sealing concrete is sufficient when it is arranged so as to project, in a layer of sufficient thickness, above the armor plates or

  shielding segments that form the cover plates.

  It goes without saying that we ensure to this effect that the enclosure

  interior is sufficiently "radiation-proof". Linen-

  vention teaches for this purpose to bring together

  shielding or shielding segments by means of sys-

  mortise and tenon profiles, composite profiles or

  composite profiles according to a connection

  and eliminating any crack. As it already has

  mentioned, the meeting may also be held uni-

  in order to absorb the filling constraints.

  The other constraints are absorbed by the concrete fill

  wise and sealing in the cured state. In order for the enclosure

  be able to withstand in a simple way the constraints

  filling, the invention recommends that the ex-

  The inner side of the interior has elements

  connecting elements for the fastening of

  or the shielding segments prior to the introduction of the filling and sealing concrete, the connecting elements being designed to withstand the filling stresses, as well as the walls of the outer casing. The armor plates or the shielding segments may have, on the outer side and / or on the inner side, roughnesses or elements of suitable shape for fastening the concrete

  filling and sealing. This improves the link between

  components described and contributes globally to increase

  the mechanical strength and stability of the entire

  container mantle. In order to be certain that the concrete

  wise and sealing satisfies all the requirements it

  is recommended in accordance with the invention that the outer envelope

  interior and the inner envelope are equipped with

  used to introduce the filling and sealing concrete

  in the form of an ascending casting.

  Other features and advantages of the present

  the invention will become apparent from the description given below,

  reference is made to the accompanying drawings, in which: - Figure 1 shows a perspective view of a

  container assembly consisting of an integral envelope

  an outer casing and used for

  nal of radioactive waste; FIG. 2 represents another perspective view of a portion A of the object of FIG. 1;

  FIG. 3 represents another form of embodiment

  the object of Figure 2; FIG. 4 represents an embodiment of the object of FIG. 2;

  FIG. 5 represents a view on a larger scale;

  the part B of the object of Figure 1.

  The container assembly shown in FIGS.

  gures consists of an inner chamber 1 and a

  2 and is intended for the final storage of radioactive waste 3. In the embodiment, it is a parallelepipedic container assembly having

  an outer enclosure 2 of parallelepipedal shape corresponding to

  and an inner chamber 1 of parallelepiped shape

  corresponding code. An interspace separator

  4 is provided between the inner enclosure 1 and the outer enclosure

  2. Interstitial space 4 as well as radioactive waste

  dioactives 3 located in the inner chamber 1 are sealed by sealing with a filling and sealing material. The filling and sealing material between the outer enclosure 2 and the inner enclosure 1 has not been shown. The filling and sealing concrete 5 located in the inner enclosure 1 has been indicated at the level of

a part torn off.

  In Figure 1 we see that the inner chamber 1, including the bottom 6 and the cover 7, is formed by the meeting of shielding plates 8. These plates are formed by casting recycled scrap and loaded with residual activity from nuclear power plants are sealed together without any slits. The layout is such

  that, in the state shown, the inner chamber 1 is

  from the mechanical point of view simply to withstand filling constraints. The inner speaker 1 as well as

  the outer enclosure 2 are joined by a filling concrete

  and seals having a corresponding composition

  to form a composite container that is con-

  designed to withstand the mechanical stresses

  during transport and during final storage. The plates of

  shielding 8 or the shielding segments cooperate in a manner

  essential for the shielding of radioactive waste.

  3 or fully perform this role. The concrete of

  filling and sealing 5 provides protection vis-

  the residual activity of the shielding segments 8 as they are formed by casting of

  scrap metal loaded or contaminated with residual activity

  the, coming from nuclear power plants. Concrete fill

  wise and sealing 5 is otherwise designed and sized

  depending on the mechanical stresses to be absorbed.

  In the exemplary embodiment and in accordance with a preferred embodiment of the invention, the filling concrete

  and sealing 5 is also inserted below the

  bottom 6 and above the cover plates.

  radioactive waste 3 located in the inner chamber 1 may

  sealed with the same filling concrete.

  5. In order for this casting and sealing casting to be carried out in a simple manner, the cover plates 7 of the inner enclosure 1 can

  have openings 9 for the introduction of the concrete 5.

  In the interspace 4 between the inner enclosure

  1 and the outer enclosure 2, one can

  steel maturing for concrete 10, as indicated in

  the left part of the figure. 1, where one recognizes a treil-

  concrete liner arranged vertically. The outer chamber

  2 is a sheet metal container with no cover

  key. It can be formed by the meeting of several plates

  of sheet metal 11 by means of the use of corner profiles 12.

  In FIGS. 2 to 4 it can be seen that the shielding plates

  8 are joined to one another by means of a complementary form connection by means of tenon and mortise or tongue-tie connection systems 13, of composite profiles 14 or of composite profile members 15. The outer enclosure 2 has, on its inner face, connection elements

  16 for attaching armor plates 8, or

  8 shielding elements have connection elements

  16 correspondents. These connecting elements 16 are arranged

  in order to support the armor plates 8 on the

  outer ring 2 to accommodate the constraints of

  wise. The armor plates 8 have on their outer side

  5, roughness 17 or shaped elements for fastening the filling and sealing concrete 5.

  It goes without saying that the outer enclosure 2 and the enclosure

  1 may comprise devices for introducing the filling and sealing concrete 5 according to

  the system of upward casting, which has not been

  sented. In any case, the shielding plates 8 require only a slight fixation or slight support at the inner wall of the outer enclosure 2 and are definitively fixed only by the filling and sealing concrete 5. This concrete 5 fixed permanently and inmutable the armor plates 8 and the plates of

  10 and the cover plates 7. It is also possible to use

  armor plates 8 which already have a coating

  concrete. This form of realization can be implemented

  when the armor plates 8, which are formed

  by casting scrap slightly contaminated or lightly

  radioactive material from nuclear power plants,

  already for their part a higher activity. This wall

  shielding or filling and sealing concrete 5

  in any case, the radiation of

  shielding plates 8, while shielding plates

  metal plates 8 themselves provide protection or a screen for the more intense radiation of radioactive waste

  located in the inner enclosure 1.

Claims (10)

  1. Container assembly, consisting of a   an inner enclosure (1) and an outer enclosure (2) for the final storage of radioactive waste, and in which an intermediate partition space is provided between the inner enclosure and the outer enclosure, and wherein a material   filling and sealing is poured into the internal space   tercalaire and around the radioactive waste in the inner chamber (1), characterized in that the inner chamber (1), including its bottom (6) and its cover (7), is formed by the meeting of shielding plenums (8) and / or segments   shielding, which are formed by recycling scrap   key, responsible for a residual activity, originating from cen-   nuclear trams and are assembled in a sealed manner without any slits, that the inner enclosure (1) is designed to absorb only filling stresses and that the inner enclosure (1) and the outer enclosure (2)   are joined by means of a filling and sealing concrete   ment (5) with a corresponding formulation, to   sea a composite container to absorb constraints transportation and final storage.   Container assembly according to claim   1, characterized in that the concrete for filling and sealing   5 is also arranged below the bottom plates or segments and above the plates or segments (8). of the lid.   3. Container assembly according to one of the   1 or 2, characterized in that radioactive waste is   3 (3) are sealed with the same filling and sealing concrete (5) in the inner enclosure (1). 4. Container assembly according to any one of   Claims 1 to 3, characterized in that the plates   (8) or the segments of the lid of the inner chamber (1) have openings (9) allowing the insertion of the concrete   filling and sealing (5).   Container assembly according to any one of   Claims 1 to 4, characterized in that armature   made of steel for concrete (10) is arranged in the inter   separation wall (4) between the inner chamber (1) and the outer enclosure (2).   Container assembly according to any one of   Claims 1 to 5, characterized in that the enclosure   outer section (2) is formed as a container in steel sheet without cover.   Container assembly according to any one of   Claims 1 to 6, characterized in that the plates   shielding (8) or shielding segments are joined together   they are connected by complementary shapes by means of tenon and mortise systems (13), composite profiles   (14) or composite profile element (15).   8. Container assembly according to any one of   Claims 1 to 7, characterized in that the enclosure   (1) or the outer enclosure (2) comprises   connecting plates (16) for fixing the shield plates.   before insertion of the filling and sealing concrete   (5) and is arranged to support the constraints   filling the inner speaker (1;   Container assembly according to any one of   Claims 1 to 8, characterized in that the plates   shielding element (8) or the shielding segments comprise, on   their outer face, roughness (17) or elements con-   formed for fastening the filling and sealing concrete (5).   10. Container assembly according to any one   claims 1 to 9, characterized in that the   outer part (2) and the inner chamber (1) comprise devices for inserting the filling and   sealing (5) according to an ascending casting mode.