ML20012C402
| ML20012C402 | |
| Person / Time | |
|---|---|
| Site: | 07109183 |
| Issue date: | 03/20/1990 |
| From: | Wells A NAC INTERNATIONAL INC. (FORMERLY NUCLEAR ASSURANCE |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20012C403 | List: |
| References | |
| AHW-90-024-EDS, AHW-90-24-EDS, NUDOCS 9003210220 | |
| Download: ML20012C402 (3) | |
Text
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- 4 Nucteer Aneurence Corps,etion N
6251 Crooked Creek Road e
Suite 200 Norcross. Georgia 30092 (404) 4411144 Talex: 0827020 FAX * (404) 4471797 stunbergstresse 9 8001 Zunch, Swtuottand 1-4T3844 Tekt $7275 i
March 20, 1990 AHW/90/024/EDS
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- VIA FEDERAL. EXPRESS -
i Mr. Charles E. MacDonald, Chief Transportation Branch NMSS:SGTB, Mail Stop WF4E4 U.S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852
Dear Mr. MacDonald:
Nuclear Assurance Corporation (NAC) hereby submits an addendum to the request for an amendment to the NAC-1/NFS 4 cask, Certificate of Compliance, Number 9183, Revision 9, which NAC submitted on January 29, 1990.
This prior request was intended to update the design of the cask basket (liner) and containers for failed metallic fuel rods. The NAC-1 is currently licensed to carry up to 10 encapsulated (defective) rods.
NAC had determined that no more than six rods can be inserted into the fuel basket because of space requirements resulting from the bowing of the rods.
The revision requested did not change any other fuel parameters.
NAC recognizes that it failed to provide a cask basket structural analysis and loading procedures for the failed fuel containers.
and wishes to submit them at this time. The structural analysis and procedures have been prepared in the format of change pages to the NAC-1/NFS-4 SAR, and two copies are attached.
The procedures for loading the cask have been modified to show that the r?
~ container used to ship the fuel will be a sealed, dry aluminum container. The fuel is loaded in the container under water, and the water is exhausted with dry compressed nitrogen. The container is vacuum dryed after the water is exhausted, So and the container is backfilled with nitrogen. The dryed, sealed containers are RE@ dry-loaded into the NAC-1/NFS 4 cask via a transfer cask in the reactor facility
$2 in the same fashion as intact fuel, Two fuel basket designs have been prepared to accept the failed fuel: a six-rod capacity version and a three-rod capacity version. The three-rod version No 2@
allows a larger diameter sealed container for badly failed fuel.
Only one rod g
is placed in each container, regardless of the type of container used, gm Structural analyses for each of the two basket designs, and each of the two
- @o containers, have been performed.
These analyses show that the containers and baskets will not exceed yield, with a minimum margin of safety of ip.47.
The fuel containers provide a containment barrier to replace the failed cladding.
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March 20, 1990 AllW/90/024/EDS Page 2
- The basket supports the sealed fuel containers to ensure that their containment function is not adversely affected in a hypothetical drop accident. The basket and container do not ensure subcriticality, since the fuel has only a natural enrichment when fabricated and cannot achieve criticality except in a heavy water j
reactor.
Please incorporate this informatior. in your review of the request for
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amendment of the cask Certificate of Compliance, Number 9183. -Should you require additional information, please contact me at (404) 447-1144, e
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Sincerely, NUCLEAR ASSURANCE CORPORATION
[ dw h4 A. H. Wells, Ph.D.
E Chief Engineer' l
Engineering Design Services AHW/kkg.
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INSTRUCTIONS ITML IMPLE3SNTATION OF MARCH 1990 REVISION L
i PACES _TO BE REMOVED PAGES TO FE INSERTED Cover Page 05/89 Cover Page 03/90 Record of Revisions 03/90
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I Section Para Number.
Date Section Pare Number De i
05/89 1
05/89
-11 02/87 11 03/90 iii.
06/84 111 06/84
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06/84 111 03/90
-g 2
2 2-97 03/90 i
through H
2 108 03/90 p4 1 '
4 3
35 02/87 3
35 02/07 36 02/87 36 03/90
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1. -;
i-3 6a 03/90 3 6b 03/90
~3 7 02/87 3-7.
03/90 i
!'E 3-8 02/89 38 02/S7 1'-
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3 14c 03/90 3 14h 03/90 i
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7-7-5 06/84 7
75 03/90 L-L 7-6 06/84 through 7-12 03/90 (Page 1 of 1)
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