ML20236A863
| ML20236A863 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/22/1987 |
| From: | Turbak M COMMONWEALTH EDISON CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20236A865 | List: |
| References | |
| 3354K, NUDOCS 8707280250 | |
| Download: ML20236A863 (2) | |
Text
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July 22, 1987 W
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fl Mr. A. Bert Davis
. Regional Administrator U.S. Nuclear Regulatory Commission Region III
-799 Rooseve1t Road Glen Ellyn, IL 60137
Subject:
Quad Cities Station Units 1 and 2 Spent Fuel Storage Racks NRC Docket Nos. 50-254 and 50-265 Reference (a):
M. S. Turbak letter to A. B. Davis dated May 5, 1987
Dear Mr. Davis:
Reference (a) transmitted a report from our contractor, Northeast Technology Corp (NETCO), that described a preliminary assessment of the Boraflex performance in the Quad Cities spent fuel storage racks. The report concluded that there was no criticality concern with the spent fuel at this time. Reference (a) also stated that we would inform you of additional analyses that were in progress.
Enclosed is a report from Southern Science that provides an additional assessment of the Boraflex anomaly at Quad Cities. The report is entitled " Criticality Safety Evaluation of Boraflex Degradation in the Quad l
Cities Spent Fuel Storage Racks", dated June 1987. These criticality f
calculations are based on the maximum theoretical shrinkage of Boraflex and they assume maximum reactivity from a hypothetical fuel bundle considered to be a besanding case for all fuel to be stored in the Quad Cities fuel pool.
These calculations take credit for gadolinium loading and the depletion of U-235.
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A. B. Davis July 22, 1987
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i In a parallel supporting study, the Northeast Technology Corp. hta conservatively evaluate 1 probabilities of Boraflex gaps occurring in random sizes and locations. Their results are incorporated herein as a supplement.
Please dirtsct any questions you may have regarding this issue to this office.
1 Very truly yours, I
L M. S. Turbak Operating Plant Licensing Director 1m
Enclosure:
As Stated cc: Resident Inspector - Quad Cities T. Ross - NRR l
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