TXX-6984, Interim Deficiency Rept CP-87-115 Re Abnormally High Calculated Natural Frequencies of soil-structure Sys. Initially Reported on 871021.Evaluation Continuing.Next Rept Will Be Submitted by 880219
| ML20236R707 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/18/1987 |
| From: | Counsil W, John Marshall TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-115, TXX-6984, NUDOCS 8711230438 | |
| Download: ML20236R707 (1) | |
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Log.# TXX-6984 h
j File # 10110
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903.7 Ref. # 10CFR50.55(e)
N# ELECTRIC wmiam c. counsii November 18, 1987 Executive Vice President t
U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 SEISMIC ANALYSIS OF SERVICE WATER INTAKE STRUCTURE SDAR: CP-87-115 (INTERIM REPORT)
Gentlemen:
On October 21, 1987, we verbally notified your Mr. H. S. Phillips of a deficiency involving abnormally high calculated natural frequencies of the soil-structure system.
Specifically, the soil-structure mass was underestimated and the soil subgrade stiffness was overestimated in the original analysis.
This is a potentially reportable item under the provisions of 10CFR50.55(e).
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We are continun.g our evaluation and anticipate submitting our next report by February 19, 1988.
Very truly yours,
- w. 6. Coa w d W. G. Counsil By:
dm JT S~. Marshall Supervisor, i
Generic Licensing-j CBC/grr c - Mr. R. D. Martin, Region IV 4
Resident Inspectors, CPSES (3) g1230438e7111s B
ADOCM 05000445 PDR 7
400 North Olive Street LB 81 Dallas, Ten. 75201
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