TXX-4976, Interim Deficiency Rept CP-86-33 Re Use of Incorrect Pipe Support Stiffness Values in Class 1 Pipe Stress Analysis. Initially Reported on 860429.Reanalysis of All Class 1 Stress Problems Completed.Next Rept by 861017
| ML20212P786 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/22/1986 |
| From: | Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-33, TXX-4976, NUDOCS 8609030275 | |
| Download: ML20212P786 (1) | |
Text
Log # TXX-4976 File # 10110 903.9 TEXAS UTILITIES GENERATING COMPANY BMYW AY TOWELN. 400 NORTH OLIVE fFTREET. L.N. S B. DALLA 8s, TEX Am 7830 t August 22, 1986 7
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Mr. Eric H. Johnson, Director b!
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 (CPSES)
DOCKlT NO. 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 values in the Unit 1 Class 1 pipe stress analysis. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e). We have submitted an interim report logged TXX-4831, dated May 28, 1986.
A reanalysis of all Class 1 stress problems in Unit I has been completed. No piping over-stresses were encountered due to support stiffness changes. The final evaluation of the effect of stiffness changes on valves, components, local stresses, penetrations, Reactor Coolant Loop nozzles, fatigue, and break locations is currently in progress.
Stone & Webster Engineering Corporation (SWEC) is currently evaluating supports for the new loads resulting from the reanalysis.
We are continuing our evaluation and anticipate submitting our next report by October 17, 1986.
Very truly yours, L U. R G - 4 C W. G. Counsil By: N.
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G.S. Keeley
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