ML19351F030
| ML19351F030 | |
| Person / Time | |
|---|---|
| Site: | 07106698 |
| Issue date: | 11/05/1980 |
| From: | Clay Johnson NAC INTERNATIONAL INC. (FORMERLY NUCLEAR ASSURANCE |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 17823, CRJ-80-185-ETS, NUDOCS 8012240307 | |
| Download: ML19351F030 (2) | |
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Nudeer Assurance Corporation 24 Executwe Pars West Acanta. Georga 30329 M4413294203 Te'ex: 549567. 542703 715 Honzon Crrve Granc Juncton. Cecraco 81Sc1 (303) 245-4320 rNX. 91C9296334 Nercergstasse 9 9001 Zunctt Smt:ertana iC1) 47C844 Te*ex. 57275 November 5,1980 CRJ/80/185/ETS Mr. Charles E. MacDonald, Chief Transoortation Certification Branch Division of Fuel Cycle and Material Safety United States Nuclear Regulatory Commission Washington, DC 20555 Re:
Dccket No. 71-6698 NFS 4 (NAC-1) Spent Fuel Shipping Cask
Dear Mr. MacDonald:
The Nuclear Assurance Corporation hereby requests that Certificate of Compliance No. 6698, Revision 12, dated October 17, 1980, ce revised to pro-vice for empty shipping of casks to facilities or installations for the purpose of indefinita storage or for the performance of maintenance, decon-tamination, cask cavity measurements, or other required services to place or reinstate the cask into conformance with the Certificate. We suggest adding the folicwing paragraph to Certificate No. 6698 to meet this request:
" Movement of empty casks to facilities or installations for the purpose of indefinite storage or for the performance of maintenance, decontamination, cask cavity measurements or other required se-as to place or reinstate the cask into conformance with this Certificate of Compliance is permitted pro-viding the shipment is in full conformance with Department of Transportation Regulations."
One reason for this request is that the NAC-1E cask currently at the San Onofre site has internal contamination that we wish to have removed at a fa-cility other than San Onofre. We need to clean the cask cavity so that cavity measurements can be made with the least exposure to personnel.
The measure-ments are required to reinstate the cask to conformance with the certificate.
There are two areas on the E cask where the radiation level is such that some local shielding will be required to meet 00T regulations. A field of 1400 mrem /hr exists at one lower valve cover and a 22 rem /hr field exists at one point on the surface of the head.
Neither of these fields exceeds 1 rem /hr at 3 feet.
There are several alternatives for attaching local shielding to reduce radiaticn levels below 200 mrem /hr at the personnel barrier.
In the case of the drain valve, lead wool or a thin sheet of lead could be placed in the valve port and held in place by the port cover. An alternative would be to
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Mr. Charles E. MacDonald Page 2 Novemcer 5, 1980 mount a lead sheet on plywood and clamp the plywood to the H beam that is part of the lower trunnion support structure. Supplemental shielding at the head of the cask could be acccmplished by placing a lead sheet inside the upper impact limiter allowing the four bolts holding the impact limiter to secure the lead. Alternatively, a lead sheet could be sandwiched between plywood sheets and the plywood bolted to the front personnel barrier.
The actual method of supplemental shielding and the amount required will be mutually agreed upon with the Shipper.
In any event, a positive means of attaching or capturing the shielding material will be used such that vibration experienced under normal transport conditions will not degrade the effective-ness of the shielding.
In accordance with 10CRF170, a check in the amount of $150 is submitted for this administrative revision to the Certificate of Conpliance.
Should you have any questions or require further information, please contact me.
Sincerely, NUCLEAR ASSURANCE CORPOR ION
' Charles R. John' son Vice President Engineering and Transportation Services CRJ/ek Enclosure l
178TG L