TXX-5011, Interim Deficiency Rept CP-86-55 Re Seismic Air Gap Design Adequacy.Initially Reported on 860814.Review of Calculations for Acceptability of Existing Design Gap Scheduled for Completion by 861031.Next Rept Expected by 861121
| ML20214P622 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 09/12/1986 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-55, TXX-5011, NUDOCS 8609230304 | |
| Download: ML20214P622 (1) | |
Text
r Log # TXX-5011 File # 10110 903.7 TEXAS UTILITIES GENERATING COMPANY SKYWAY TOWER. 400 NORTH OLIVE STREET. L.B. 81. D ALLAS. TEXAS 75301 September 12, 1986 PW@WUWMV%
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SEP l 21986 i
l Mr. Eric H. Johnson, Director Division of Reactor Safety and Projects M
U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76012
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS.
50-445 AND 50-446 SEISMIC AIR GAP DESIGN ADEQUACY SDAR: CP-86-55 (INTERIM REPORT)
Dear Mr. Johnson:
On August 14, 1986, we verbally notified your Mr. I. Barnes of a deficiency involving the seismic air gap design adequacy between the Auxiliary Building and Units 1 and 2 Containment Buildings. This is an interim report of a potentially reportable item under the provision of 10CFR50.55(e).
The specific deficiency involved recent calculations which indicate that a separation gap dimension should be greater than the existing design dimension during extreme high temperature conditions.
Our review has indicated this calculation used conservative assumptions. More recent calculations (based upon more realistic data) demonstrate the present design gap is acceptable. These calculations are presently being reviewed by third party reviewers. This review.is currently scheduled for completion by October 31, 1986.
We are continuing our evaluation and anticipate submitting our next report by November 21, 1986.
Very truly yours,
'M W. G. Counsil JCH/amb c - NRC Region IV (0 + 1 Copy)
Director, Inspection & Enforcement (15 copies)
U. S. Nuclear Regulatory Commission Washington, D.C.
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