FR2509896A1 - SINK CABIN WITH SPACES FOR QUICK SURGERY - Google Patents

Abstract

DUCTING BOX WITH SPACING PARTS FOR FAST SUPERREGENERATORS, IN WHICH THE SPACING PARTS ARE CONSTITUTED BY PROJECTS PLACED ON THE HOUSINGS IN THE PLANS OF THE SPACING PARTS. THE PROJECTS 4 ARE SHAPED BY STAMPING OUTSIDE FROM THE BOX 1 IN THE AREA OF AREAS 3 AND THE THICKNESS OF THE WALL OF THE BOX IN THE AREA OF THE PLANS OF THE SPACING PIECES AND THE PROJECTS IS ABOUT EQUAL TO THAT OF THE REST OF THE BOX. THE EXTERNAL SURFACES OF THE PROJECTIONS 4 ARE SENSITIVELY PARALLEL TO THE SIDES 2 OF THE BOX 1 AND FORM ON EACH SIDE IN THE PLAN OF THE SPACING ROOMS TWO SUPPORT SURFACES FOR NEIGHBORING BOXES. SIDES 2 OF BOX 1 IN THE ZONE OF THE SPACING ROOMS PLAN ARE LESS WIDER THAN ARETES 3.

Description

1 - Sheathing casing with spacers for breeders

  The present invention relates to a housing of

  sheathing with spacers for fast breeders

  These caissons, which generally have a hexagonal cross section, are placed side by side

  in the reactor and maintained reciprocally at a distance

  this determined by spacers When operating

  The behavior of the core elements is defined by the behavior of the fast neutron bombardment and the high service temperatures. The neutron flux is maximum towards the center of the heart and decreases towards the foot and the head of the elements.

  as well as radially outwardly

  barded by a fast neutron flux then exhibit large volume increases that depend on the

  neutron dose, temperature and condition of the material.

  In view of these dependencies, in combination with the existing temperature zones in the core element, there are different expansions which, if they are thwarted, produce tensions in the parts of the structure of the element. voltages can be suppressed or limited by neutron-induced creep and thermal

  As a result of the pressure difference between the

  this internal and the outer face of the cladding box, its originally hexagonal cross section widens

  on the flanks under the effect of the creep induced by the neu-

  This expansion by creep is superimposed on

  increase in the cross-section of the provo-

  In accordance with the aforementioned profile of the neutron flux with a maximum close to the center of the heart, this box takes a thickened form in its longitudinal section To arrange between the caissons a free space sufficient to allow their expansions due to creep and swelling and obtain defined contact points for the transmission of the binding forces of the heart between the caissons, they are separated and

  they are reinforced by means of spacers.

  these spacers are arranged in different planes.

  The spacers made or designed so far have welded projections, screwed or stamped on the sides of the casing caissons In the caissons

  arranged next to each other, these protrusions are all

  keep a constant distance between them.

  Spacers are also known as hexagonal rings

  to increase the resistance

  the wear of these rings, we sometimes weld plates

  in Stellite on the edges of the cladding boxes.

  The presently known embodiments

feel different disadvantages.

  In the case of rings or projections reported

  welding, the wall of the caissons in the planes of the

  these spacing is thicker than in the rest of the boxes which is to be avoided for reasons of economy

  of neutrons and because of the complication of the calculation of

  In addition, weld points are cri-

  and can only be achieved with the implementation of important means Another major disadvantage

  in the fact that it is difficult to extract individual-

  boxes equipped with spacers on their

  flanks, since in some cases in the central area

  of the heart, it is impossible to remove the spacers by passing them in front of the enlarged neighboring caissons, especially enlarged at the level of their

flanks.

  The present invention therefore aims to find a means as simple as possible to provide

  a sheathing casing of spacers that guarantee

  have a high rigidity of the box, allow the trans-

  mission of important liaison forces of the heart and, ill-

  this does not in any way prevent the extraction -3-

individual caissons.

  This result is achieved according to the invention with a

  box of the aforementioned type in which the projections which serve

  Spacers are stamped from the box itself, in the area of the edges. With this process, the thickness of the wall of the box remains approximately constant even in the area of the projections.

  protrusions are established so that their external surfaces

  are approximately parallel to the flanks of the

  son and thus form on each side of the latter in the plane of the spacers two bearing surfaces for adjacent boxes of identical construction In such a case, the projections protrude only very little on the sides of the box so that these flanks are less broadened than

  the edge zone The advantage of this type of space piece

  on the one hand the ease of their manufacture, and on the other hand their considerably improved statics, that is to say the greater rigidity of the box in the

  spacer zone The efforts between the

  The caissons are now no longer transmitted on the flanks, but in the zone of the edges.

  such spacers can be extracted individually-

  without any difficulty, since the projections in the

  area of the ridges can not come up against

  widened sides of the neighboring caissons.

  According to another advantageous feature of the invention

  vention the projections are not stamped with sharp edges

  from the box, but are equipped with changing transitions

  braked or rounded, this also avoids

mutual hiding of the caissons.

  To enable him to play certain particular roles

  In addition, it is advantageous according to the invention to

  provide the caisson with transitional sections between the

  lees and non-widened parts of the flanks in the area of the planes of the spacers Each flank of the caisson in the area of a plane of the spacers consists of four sections, one middle section not or only a few widened, two substantially parallel protruding sections

  to it, and two transition sections interspersed with

  be the median section and the protruding sections By static calculations and adaptation to different parameters, such as: temperature, neutron irradiation, wall thickness, binding efforts of the core, handling etc. we can establish ratios of optimal sizes between these different sections and the reciprocal values of

  their angles according to the requirements imposed on the

  the simplicity of the construction, it results in

  Various embodiments which are explained in the exemplary embodiments In another embodiment of the invention, the median section of each flank is very short or may even be completely suppressed.

  this case, the entire flank in the area of the plane of the

  these spacing is also more or less enlarged and

  turns gradually into a projection at the edge.

  This embodiment is easy to manufacture and large

rigidity.

  According to another particularity of the invention, in the region of the planes of the spacers, it is possible to provide several groups of axially offset embossed projections. This embodiment results in a greater increase in rigidity and is advantageous for In this way, in the area of the plans of the spacers,

  not only two support surfaces for each

than neighboring box, but more.

  The invention will be better understood with the aid of

  description of embodiments taken as examples, but

  non-limiting, and illustrated by the attached drawing, on the-

  What: The figure is a perspective view of a cladding box cut in the axial direction and in a plane of the spacers; Za Figure 2 shows a cross section

  of a cladding box in the plane of the space pieces-

  is lying; Fig. 3 shows an enlarged detail of Fig. 2, namely, the area of a housing box flank in the plane of the spacers; Figure 4 is a side view of a cladding box in the plane of specially made spacers; Figure 5 is a cross section of the cladding box V-V of Figure 4; FIG. 6 is a side view of a box of

  sheathing in the area of the plane of the spacer parts

  differently; Figure 7 is a cross section following

VII-VII of Figure 6.

  In these figures, the cladding box is designated by the reference 1 This box has a hexagonal cross section so that it consists of six sides 2 and six edges 3 In the plane of the spacers, protrusions 4 are formed by stamping outwards from the box without however the thickness of the

  wall of the latter is modified in substantial proportions.

  The projections are in the edge area

  3 that they encircle slightly over each side

  2 The flanks themselves are not greatly enlarged, at least in their middle, so that there is still a free space for their swelling under the effect of fast neutron bombardment. The relatively sharp edges represented in FIGS. 1 and 2, protrusions 4 can be softened, as illustrated

  in FIG. 3, by transition sections 22.

  FIG. 3 shows the cross-section of a sidewall in the area of a plane of the spacers, this sidewall being divided into five sections: in the center the non-widened zone of the sidewall 23, on the outside the sections 21 corresponding to the protrusions and between the non-enlarged area and sections 21

  transition sections 22 Relationships between

  mensions and angles of these various sections can

  to be chosen differently according to the conditions and

  tolerance mimits The following figures show other examples of embodiment of the spacers. FIG. 4 shows a shape in which the section 23 is not completely formed in the sidewall, so that on the upper and lower edges 41 of the

  spacing piece the flanks are also slightly repouss-

  However, the protrusions themselves 40 of the spacers are also in the zone of the ridges 3. FIG.

  example in which section 23 was

  The flanks in the plane of the spacers are slightly pushed outwards As can however be seen in the cross-section of FIG. 7, the projections 42 themselves of the spacers are in the zone of the edges 3 This embodiment is characterized by a particular rigidity, but offers however less space

  for the swelling of neighboring casing boxes.

-7-

Claims (5)

  1. Sheathing box with spacers   for fast breeders, in which the pieces of   are formed by projections placed on the casing boxes in the planes of the spacers, characterized by the fact that:   a) that the projections (4) are formed by stampings   wise outwards from the box (1) in the area of its edges (3); b) that the thickness of the wall of the box in the area of the planes of the spacers and projections is substantially equal to that of the remainder of the box; c) that the outer surfaces of the projections (4) are arranged approximately parallel to the sidewalls (2) of the box (1) and thus form on each side of the box in the plane of the spacers two bearing surfaces for the neighboring caissons; d) that the flanks (2) of the box (1) in the area of the plane of the spacers are less wide than the edges (3).   2. Sheathing box with spacers se-   1, characterized in that the transitions between the projections and the non-widened wall of the caisson are rounded.   3 Sheathing box with spacers se-   1, characterized in that each side (2) of the box (1) in the area of the part plane   Spacing consists of five sections: a section of   diane (23) not or slightly enlarged, two projecting sections (21) substantially parallel thereto and two sections transition (22).   4. Sheathing casing with spacers according to claim 3, characterized in that the   middle section (23) is very short or completely winning.   5. Sheathing box with spacers 8 -   according to any one of the preceding claims,   characterized in that in the area of the planes spacers, the casing is provided with several clusters axially offset projections obtained by stamping outwardly.