ML22271A477
| ML22271A477 | |
| Person / Time | |
|---|---|
| Site: | Orano USA |
| Issue date: | 04/30/2012 |
| From: | Shaw D TN International |
| To: | Division of Fuel Management |
| Garcia-Santos N | |
| Shared Package | |
| ML22271A128 | List:
|
| References | |
| A33010, L-2022-DOT-0007 | |
| Download: ML22271A477 (6) | |
Text
TN International APPENDIX 1.3-1 A
AREVA Names Signatures Date FCC3 Written DOS-13-00081779-Ref.
I 031-NPV IRev I 00 Checked Form: PM04-3-MO-3 rev. 2 Page 1/6 DESCRIPTION OF FUEL ROD BOXES FOR FCC3 CONTAINERS
- 1. PURPOSE .......................................................................................................................... 3
- 2. GENERAL DESCRIPTION ............................................................................................ 3
- 3. CONFIGURATION OF THE FUEL ROD BOX ........................................................... 6 Non-proprietary version
TN International Ref. DOS-13-00081779-031-NPV Rev. 0 Page 2 / 6 REVISION STATUS Written /
Revision Date Modifications Checked Initial issue 0 04/2012 - Review of document FFDC 04934 revision A Non-proprietary version
TN International Ref. DOS-13-00081779-031-NPV Rev. 0 Page 3 / 6
- 1. PURPOSE This purpose of this document is to describe the fuel rod boxes that are transported in FCC3 containers. General arrangement drawings for these boxes are given in Appendix 1.3-2 of this documentation package. The term "fuel rod channel" is also sometimes used to designate the fuel rod box.
- 2. GENERAL DESCRIPTION 2.1 Materials The components of the rod box are made of type stainless steel not sensitive to temperature between -40°C and +70°C and conforming to ( >
and > . The packing shims are made of aluminium.
2.2 Box body Non-assembled new fuel rods are transported by placing the rods in a box which is then inserted into one of the 2 cavities of an FCC3 container.
It is possible to transport 2 fuel rod box in the 2 cavities of an FCC container.
However, it is not permissible to transport a rod box together with a fuel assembly.
The box body comprises a U-shaped plate closed at both ends and reinforced lengthwise with 2 stringers welded on the upper part of the plate.
The arrangements for axial and radial restraint of the rods are described below.
The horizontal gap between the cavity and the fuel rod box is filled by applying the horizontal pads of the container door against the side of the box.
2.3 Axial restraint of fuel rods for the FCC3 rod box Where the fuel rods are shorter in length than the box, the gaps are packed with shims of a length adapted to that of the rods. Axial shims are thus specified for fuel rods of 10-foot assemblies or 8-foot assemblies. The fuel rods of 12-foot assemblies are the same length as the FCC3 box and therefore no axial shims are required.
The rods are loaded in the centre of the box and 2 identical axial shims are placed at the ends of the box so as to limit the movement of the centre of gravity. The shims are fixed by means of a screw-and-nut system to the bottom of the box so as not to bear on the rods in the event of an axial drop. The nominal lengths and tolerance intervals of the rods vary according to the design. The screw-and-nut attachment system is therefore adjustable so as to limit the axial play. Figure 1 below shows an axial shim referenced 2.
Given the presence of the stringers on the box, the width of the axial shims cannot be the same as the width occupied by the fuel rods. For this reason an end support plate for rods of greater width is placed between the rods and the shim (Figure 1 -
reference 16).
Non-proprietary version
TN International Ref. DOS-13-00081779-031-NPV Rev. 0 Page 4 / 6 The box is held in position lengthwise in the cavity by means of 2 box shims (Figure 1 - reference 3):
the one at the bottom end between the container bottom plate and the rod box accommodates the adjustable restraint system of the axial shim, the one at the top end between the container top plate and the rod box also serves to support to the top plate pad, limiting the axial play between the box and the cavity.
Figure 1 : Axial restraint of fuel rods for the FCC3 rod box 2.4 Radial restraint of fuel rods The box is filled with full rows of rods. Incomplete rows are made up with inert rods of equivalent dimensions.
The minimum shimming height is mm (maximum useful height: mm).
Non-proprietary version
TN International Ref. DOS-13-00081779-031-NPV Rev. 0 Page 5 / 6 Loading an intermediate number of rows of fuel rods Given the presence of stringers on the box, the width of the radial shims cannot be the same as the width occupied by the fuel rods. For this reason 2 support plates are placed side by side between the fuel rods and the radial shim to cover the width of the rod bundle. In the case where the box is filled with a number of rows less than 13, the space above the rods is filled by a main radial shim and by a set of row packing shims. This shim set consists of an upper shim of the same length as the radial shim and short intermediate shims placed at regular intervals between the upper shim and the radial shim. These elements are held together by screws of which the heads are seated within the thickness of the upper shim and which are screwed into the radial shim. The vertical gap between the cavity and the shim system is compensated by applying the vertical pads of the container door.
Loading a small number of rows of fuel rods In the case of a small number of rows of fuel rods, 2 radial shims can be stacked together instead of an excessive number of intermediate packing shims.
The number of fuel rods transported is limited so as not to exceed the maximum weight per cavity (total weight of box + rods) of 751 kg.
Non-proprietary version
TN International Ref. DOS-13-00081779-031-NPV Rev. 0 Page 6 / 6
- 3. CONFIGURATION OF THE FUEL ROD BOX The composition of the rod box for each configuration is defined in the columns of the following table in relation to the type of fuel rods transported. The values are indicated per shimming assembly.
FCC3 container Fuel rods 17x17 Fuel rods 15x15 Fuel rods 14x14 Fuel rods 14x14 12-foot 12-foot 10-foot 8-foot Maximum transportable number of rods 185 148 167 204
- : In the event that a smaller number of fuel rods are transported, radial shims are positioned together.
- : Short-handled support plates + long-handled support plates Non-proprietary version