ML22277A793
| ML22277A793 | |
| Person / Time | |
|---|---|
| Site: | 07103097 |
| Issue date: | 08/03/2022 |
| From: | Boyle R, Shaw D TN Americas LLC |
| To: | Division of Fuel Management |
| Garcia-Santos N | |
| Shared Package | |
| ML22277A716 | List:
|
| References | |
| EPID L-2022-DOT-0008, CAC A33010 | |
| Download: ML22277A793 (8) | |
Text
AREVA TN AREVA UNRESTRICTED DISTRIBUTION NUCLEAR LOGISTICS OPERATIONS APPENDIX 1.3-1 A SAFETY DESCRIPTION OF ROD BOXES FOR FCC4 AREVA Form: PM04-4-MO-6 Rev. 00 ANALYSIS CONTAINERS REPORT Prepared by Identification FCC4 DOS-13-00081778-031-NPV Checked by Rev. 01 Page 1 / 8 TN International Table of Contents Revisions history 2
- 1. Purpose 3
- 2. General description 3
- 3. Configuration of the rod box 7 Non-proprietary version
AREVA UNRESTRICTED DISTRIBUTION AREVA TN Form: PM04-4-MO-6 Rev. 00 NUCLEAR LOGISTICS OPERATIONS Identification: DOS-13-00081778-031-NPV Rev.: 01 Page 2 of 8 Revisions history Rev. Date Purpose and record of changes Prepared by / Checked by First issue 00 04/2012 Review of document FFDC 04934 revision A Rod box added for rod type EPRTM Additional information on characteristics of materials used See first 01 Modification to Figure 2 illustrating the axial spacer of the EPRTM box page Update to table in Paragraph 3 for EPRTM configuration Non-proprietary version
AREVA UNRESTRICTED DISTRIBUTION AREVA TN Form: PM04-4-MO-6 Rev. 00 NUCLEAR LOGISTICS OPERATIONS Identification: DOS-13-00081778-031-NPV Rev.: 01 Page 3 of 8
- 1. Purpose This purpose of this document is to describe the rod boxes that are transported in FCC4 containers.
Assembly drawings for these boxes are given in Appendix 1.3-2 of this documentation package. The term "rod channel" is also sometimes used to designate the rod box.
- 2. General description 2.1. Materials The components of the rod box, including the axial spacers, are made of type stainless steel not sensitive to temperatures between -40 °C and +70 °C and conforming to
( > MPa and > MPa).
The compensating spacers are made of an aluminium alloy as per or justified equivalent ( > MPa and > MPa).
The welds of the axial EPRTM spacers are fillet welds with an apothecary of mm. A 100%
dye penetration test is required during manufacturing.
2.2. Box body Non-assembled fresh fuel rods are transported by placing the rods in a box which is then inserted into one of the 2 cavities of an FCC4 container.
It is possible to transport 2 fuel rod boxes 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.
Two box body lengths are defined:
one adapted to the lengths of type EPRTM rods (known hereinafter as an EPRTM rod box),
the other enabling the transportation of other rods (known hereinafter as an FCC4 rod box).
The arrangements for axial and radial restraint of the fuel rods are described below for these 2 box body lengths.
The horizontal gap between the cavity and the 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 FCC4 rod box Where the fuel rods are shorter in length than the box, the gaps are filled with spacers of a length adapted to that of the rods. Axial spacers are thus specified for rods of 12-foot assemblies, 10-foot assemblies or 8-foot assemblies. The rods of 14-foot assemblies are the same length as the FCC4 box and therefore no axial spacers are required.
The rods are loaded in the centre of the box and 2 identical axial spacers are placed at the ends of the box so as to limit the movement of the centre of gravity. The spacers 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 by lock nut so as to limit the axial gap. Figure 1 below shows an axial spacer item 2.
Non-proprietary version
AREVA UNRESTRICTED DISTRIBUTION AREVA TN Form: PM04-4-MO-6 Rev. 00 NUCLEAR LOGISTICS OPERATIONS Identification: DOS-13-00081778-031-NPV Rev.: 01 Page 4 of 8 Given the presence of the stringers on the box, the width of the axial spacers cannot be the same as the width occupied by the rods. For this reason an end support plate for rods of greater width is placed between the rods and the spacer (Figure 1 - item 16).
The box is held in position lengthwise in the cavity by means of 2 box spacers (Figure 1 -
item 3):
the one at the bottom end between the container bottom plate and the rod box accommodates the adjustable restraint system of the axial spacer, 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 gap between the box and the cavity.
Figure 1: Axial restraint of rods for the FCC4 rod box 2.4. Axial restraint of rods for the EPRTM rod box The box is aligned along its axis by adjusting a support plate, which enables the length of the box cavity to be adjusted to the length of the fuel rods.
The rods are loaded and pushed against the base of the box body. At the other end, an end support plate secured to the axial spacer is pushed against the ends of the rods. The spacer is secured using a nut and bolt system holding it in place. This system accommodates the variations in lengths of the rods due to tolerances. Figure 2 below describes the system in question.
Non-proprietary version
AREVA UNRESTRICTED DISTRIBUTION AREVA TN Form: PM04-4-MO-6 Rev. 00 NUCLEAR LOGISTICS OPERATIONS Identification: DOS-13-00081778-031-NPV Rev.: 01 Page 5 of 8 Figure 2: AXIAL RESTRAINT OF RODS FOR EPRTM ROD BOX 2.5. Radial restraint of rods The principle of radial restraint of the rods is the same for the FCC4 rod box and the EPRTM rod box.
The box is filled with full rows of rods. Incomplete rows are completed with inert rods of the same diameter and length.
The minimum spacer height is mm (maximum useful height: mm).
Loading of rows of Ø 10.75 mm rods (maximum load)
The space in the cavity above the fuel rods is filled using a spacer system. This device comprises a principal radial spacer, corresponding to the space above the rows of rods (Ø 10.75 mm). Assuming the presence of stringers attached to the box, the width of the radial spacers cannot equal that occupied by the rods. For this reason plates are placed side by side between the rods and the radial spacer to cover the width of the rod bundle.
Non-proprietary version
AREVA UNRESTRICTED DISTRIBUTION AREVA TN Form: PM04-4-MO-6 Rev. 00 NUCLEAR LOGISTICS OPERATIONS Identification: DOS-13-00081778-031-NPV Rev.: 01 Page 6 of 8 Loading an intermediate number of rows of rods In the case of filling with rods of diameter less than 10.75 mm or filling with a smaller number of rows, the space is filled by a set of row compensation spacers. This spacer set consists of an upper spacer of the same length as the radial spacer and short intermediate spacers placed at regular intervals between the upper spacer and the radial spacer. These elements are held together by screws of which the heads fit within the thickness of the upper spacer and which are screwed into the radial spacer. The vertical gap between the cavity and the spacer system is filled by applying the vertical pads of the container door.
Loading a small number of rows of rods In the case of a small number of rows of rods, 2 radial spacers can be stacked together instead of an excessive number of intermediate compensation spacers.
The number of fuel rods transported is limited so as not to exceed the maximum weight per cavity (total weight of box + rods) of 856 kg.
Non-proprietary version
AREVA UNRESTRICTED DISTRIBUTION AREVA TN Form: PM04-4-MO-6 Rev. 00 NUCLEAR LOGISTICS OPERATIONS Identification: DOS-13-00081778-031-NPV Rev.: 01 Page 7 of 8
- 3. Configuration of the 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 rods transported. The values are indicated per spacer assembly.
FCC4 container Fuel rods Fuel Fuel rods Fuel rods Fuel rods Fuel rods Fuel rods Fuel rods 17x17 rods 16x16 18x18 17x17 15x15 14x14 14x14 1---------+---------------
14-foot 17x17 14-foot 14-foot 12-foot 12-foot 10-foot 8-foot EPRTM 14-foot Non-proprietary version
AREVA UNRESTRICTED DISTRIBUTION AREVA TN Form: PM04-4-MO-6 Rev. 00 NUCLEAR LOGISTICS OPERATIONS Identification: DOS-13-00081778-031-NPV Rev.: 01 Page 8 of 8 FCC4 container Fuel rods Fuel Fuel rods Fuel rods Fuel rods Fuel rods Fuel rods Fuel rods 17x17 rods 16x16 18x18 17x17 15x15 14x14 14x14 14-foot 17x17 14-foot 14-foot 12-foot 12-foot 10-foot 8-foot EPRTM 14-foot I ------------+------------------
185 185 148 205 185 148 167 222
- In the event that a smaller number of rods are transported, radial spacers are stacked.
- short-handled support plates + long-handled support plates Non-proprietary version