TXX-4831, Interim Deficiency Rept CP-86-33 Re Use of Incorrect Pipe Support Stiffness Values in Class 1 Pipe Stress Analysis. Initially Reported on 860429.Evaluation Continuing.Next Rept Will Be Submitted by 860822
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| ML20198K248 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 05/28/1986 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-33, TXX-4831, NUDOCS 8606030377 | |
| Download: ML20198K248 (1) | |
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|---|---|
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Text
F Log # TXX-4831 File # 10110 TEXAS UTILITIES GENERATING COMPANY 903.9 NKYWAY TOWER e 400 NORTH OIJVE NTREET, t.B. 31. DAIJ AB. TEXAS 75301 May 28, 1986 $ @ @ QMig w
o.imm
. u.o. .c.ou.w.s.it ,j g WY 2 91986 I e
Mr. Eric H. Johnson, Director U
L i Division of Reactor Safety and Projects /
U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76012
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION DOCKET N0. 50-445 STIFFNESS VALUES FOR CLASS 1 STRESS ANALYSIS SDAR: CP-86-33 (INTERIM REPORT)
Dear Mr. Johnson:
On April 29, 1986, we verbally notified your Mr. T. F. Westerman of a deficiency involving the use of incorrect pipe support stiffness valur in the Unit 1 Class 1 pipe stress analysis. This is an interim report. r a potentially reportable item under the provisions of 10CFR50.55(e).
Stone & Webster Engineering Corporation (SWEC) has completed the calculations of all stiffness values for the pipe supports on Class I stress problems. Westinghouse is reanalyzing these stress problems and issuing revised pipe support loads to SWEC for review. No piping overstress situations have been encountered for the stress problems where loads have been issued. SWEC has not yet started to assess the existing supports for adequacy due to load increases.
We are continuing our evaluation and anticipate submitting our next report by August 22, 1986.
Very truly yours, A
W. G. Counsil JCH/grr c - NRC Region IV (0 + 1 copy)
Director, Inspection & Enforcement (15 copies)
U. S. Nuclear Regulatory Commission Washington, D.C. 20555 8606030377 860528 PDR ADOCK 05000445 S PDR A nzvision or rexAs vrizznzs suscraic cosersur
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