ML19351D191
| ML19351D191 | |
| Person / Time | |
|---|---|
| Site: | 07106698 |
| Issue date: | 09/12/1980 |
| From: | Clay Johnson NAC INTERNATIONAL INC. (FORMERLY NUCLEAR ASSURANCE |
| To: | |
| Shared Package | |
| ML19351D192 | List: |
| References | |
| 17359, CRJ-80-144-ETS, NUDOCS 8010090188 | |
| Download: ML19351D191 (2) | |
Text
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c f,s u.s RECEP/ED 'O Mr. Charles E. MacDonald, Chief Transportation Certification Branch Division of Fuel Cycle and Material Safety 2p SEP15 G > -
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Re: Docket No. 71-6698 g
NFS-4 (ilAC-1) Spent Fuel Shipping Cask g
Dear Mr.,
MacDonald:
Nuclear Assurance Corporation hereby requests that Certificate of Compliance No. 6698, Revision No. 11, dated July 14, 1980 be revised to provide for statistical as well as direct comparison analyses of cavity dimensional measurements.
In the course of performing the measurements on casks whose cavities are contaminated and radioactive, it has been found that it is impractical to repeat measurements at the precise locations of previous measurements. This leads to differences in individual measurement values in isolated cases that exceed the 0.015 in.
tolerance specified in Revision No. 9 to the Certificate of Compliance.
Statistical analyses of repeated measurements of the cavity, however, show that there has been no significant change in the cavity geometry which is what the measurements were originally intended to verify.
The difficulty came to light during the analyses of measurements taken in late August,1980 of the cavity of Casb NAC-1D. Because of the complexity of the field operations to perform the physical measurements of the cavity, the isolated cases of measurement values exceeding the 0.015 in. tolerance were not immediately identified.
In fact, an initial review in the field of the measurement data indicated that the dimensional values were essentially the same as those reported for the original measurement of the Cask cavity performed in 1979.
On the basis of this initial review, we stated that the Cask was acceptable for use in accord-ance with the Certificate of Compliance and the Cask was returned to service.
8010 09 0 t 8 8 17359
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f Mr. Charles E. MacDonald September 12, 1980 Page Two l
During a more detailed analysis and reduction of the measurements l
in early September, the isolated and random instances of values in excess of the. tolerances emerged.
In view of this finding, fluclear Assurance Corporation withdrew the NA,C-10 Cask from service September 5,1980, and continued to analyze the measurement data. The results of NAC's analyses and comparison to the measuremerts made of this Cask in 1979 are described in the attached report number NAC-E-803.
1 Specifically, we request Paragraph 14 of Certificate No. 6698, Revision 11, be changed to:
- 14. At nominal intervals of at least six (6) months following the first shipment of irradiated fuel under Revision 9 and later revisions to Certificate of Compliance No. 6698, the licensee snall perform physical measurements of the cask inner shell and prepare a report of the results of the analyses of these measuremer.ts within one (1) month of performance of the measurements. The measurements shall be analyzed and compared to previous measurements reported f
for each cask and documented in Appendix C to NAC letter dated June 8,1979.
Statistical and direct comparison analyses shall be performed and any cask whose inner container dimensions are shown to deviate or to have changed significantly from the dimensions specified in License Drawing No.10080, Revision 19, or from previously measured dimensions, shall be withdrawn from service until such time as it is specifically approved for return to i
service by the Commission.
In accordance with the schedule of fees published on Page 7223 of the Federal Register, Volume 4, Number 35, dated February 21, 1978, enclosed is a check in the amount of $150.00 for this administrative amendment.
Should you have any questions or if further information is desired, please contact me at your earliest convenience.
Very truly yours, NUCLEAR ASSURANCE CORPORATION WAuh C. R. Johnson Vice President Engineering and Transportation Services Division CRJ/kp Enclosure
.