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

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)

Text

- - -._ -

Log # TXX-6042 File # 10110 )

903.9 TEXAS UTILITIES GENERATING COMPANY SKYWAY TOWER . 439 NORT98 OLIVE STREET. I.R. 98 . DALIAs. TEXA5 7EEDI October 15, 1986

.).

• 2 2 a' = :2, mlf @ W.. , .M  ;,. -- i

- ~

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.

gO22OO54861015 S ADOCK 05000445 PDR a unuswn <w rexrs arrunrs vu.ucrme anorm

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

i l

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

i

)

4 1

f l

4

. - . v-,- ., - - - - _ . , ,,,_,,_ , , - _ _ , - . -. . -. .

.-.,_,,._,,.-,.--,-,,,c..-.. .,- ----r-,- ..,-,,,,_.c . - - - - - . , - -- - - ~ . ,