TXX-6042, Interim Deficiency Rept CP-86-72 Re Plant Mods Resulting from Pipe Support Reverification Program.Initially Reported on 860606.Issue Divided to Segregate Small Bore Piping & Supports from Large Bore.Next Rept Expected by 861201
| ML20211C922 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/15/1986 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-72, TXX-6042, NUDOCS 8610220054 | |
| Download: ML20211C922 (3) | |
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Log # TXX-6042 File # 10110
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903.9 TEXAS UTILITIES GENERATING COMPANY SKYWAY TOWER. 439 NORT98 OLIVE STREET. I.R. 98. DALIAs. TEXA5 7EEDI October 15, 1986 mlf @ W..,. ;,. --
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l DCT151986 gh 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)
DOCKET NOS. 50-445 AND 50-446.
SMALL BORE PIPING AND SUPPORTS SDAR: CP-86-72 (INTERIM REPORT)
Dear Mr. Johnson:
On June 6,1986, we notified you of a reportable item involving the scope of plant modifications resulting from the project's pipe support reverification program (see TXX-4844).
This issue was being tracked under SDAR CP-86-36, Pipe Supports. We are dividing this issue into two parts to segregate small bore piping and supports from large bore piping and supports.
SDAR CP-86-36 will become'"Large Bore Piping and Supports", and SDAR CP-86-72 is "Small Bore Piping and Supports".
The scope of SDAR CP-86-72 includes Unit 1 and 2 small bore (2" and under)
ASME class 2 and 3 piping and supports that are not part of large bore or class 1 stress problems which are covered in SDAR CP-86-36.
Interim reports will include a tabilation by category of piping or support modifications as follows:
1)
Prudent. Acceptance by physical modification versus analysis.
Supports in this category may be technically acceptable; however, more time and expense would be involved than that required to physically modify the support and qualify the modification.
- 2) Recent NRC and Industry recommended practice. Modifications implemented to eliminate snubbers to enhance a plant maintainability, reduce in-service inspection, and minimize worker exposure (operating plant conditions).
- 3) Adjustment. Minor modifications (such as re-torquing or shimning) implemented to meet more rigorous installation criteria contained in the resolution of the external source technical iscues.
- 4) Cumulative effects. Modifications that may be required due to the combined effect of multiple issues.
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TXX-6042 October 15, 1986 Page 2 of 2 The attached list shows the support modifications initiated to date. We are continuing our evaluation and anticipate submitting our next report by December 1, 1986.
Very truly yours, (7f72/
W. G. Counsil JCH/amb Attachment c - NRC Region IV (0 + 1 copy)
Director, Inspection & Enforcement (15 copies)
U. S. Nuclear Regulatory Commission Washington, D.C.
20555 1
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4 TXX-6042 l
October 15, 1986 Page 1 of 1 ATTACHMENT SMALL BORE PIPE SUPPORT MODIFICATIONS Number of Mail Cateaory Modifications 1
Prudent-26 Recent Industry Practice 56 Adjustment 33 Cumulative Effects 32 2
Prudent 4
Recent Industry Practice 14 Adjustment 10 Cumulative Effects 74 i
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