ML20237J052

From kanterella
Jump to navigation Jump to search

Responds to Util Proposing to Resolve Issue Re Main Steam Line Wall Thicknesses Which Did Not Meet Min Requirements.Util Adequately Demonstrated That Safe Operation of Plant Until May 1989 Will Not Be Compromised
ML20237J052
Person / Time
Site: Trojan File:Portland General Electric icon.png
Issue date: 08/21/1987
From: Chan T
Office of Nuclear Reactor Regulation
To: Cockfield D
PORTLAND GENERAL ELECTRIC CO.
References
TAC-65472, NUDOCS 8708250277
Download: ML20237J052 (2)


Text

'

AUG 211987

' Docket No.: 50-344 _ DISTRIBUTION ,

4 Docket' File C ACRS(10)

NRC & Local PDRs PD5 Plant File Mr. David W.'Cockfield GHolahan

, Vice President, Nuclear Tchan Portland General Electric Company JLee 121 S. W. Salmon Street OGC-Bethesda L . Portland, Oregon 97204' EJordan JPartlow

Dear Mr. Cockfield:

SUBJECT:

TROJAN-MAINSTEAMLINEWALLTHICKNESS(TACNO.65472)

'By letter dated June 11, 1987, Portland General Electric Company (PGE) informed the staff of observed main steam line wall thicknesses which did not meet the specified minimum requirement. The wall thickness discrepancies were confined to areas at the flow-limiting venturi outlet for all steam generators.

The'cause of the discrepancy was attributed to machining of the pipe spools in preparation for installation of the venturi. As a result, PGE provided results of analyses performed in accordance with ASME Section III, NB3600, in order to demonstrate complicace to Trojan's Code of Record for this portion of piping, ANSI B31.7, Class 2.

Since this ap)lication of the Code req'uirements is a point of interpretation, PGE 3roposed )y letter dated July E7. 1987, that this issue be resolved in one of tie following ways: (1) staff concurrence of PGE's interpretation of the ASME Code by December 1,1987, or (2) the completion of pipe replacement by the end of Trojan's 1989 refueling outage. PGE's justification for interim operation was based upon the results of the June 11, 1987 analyses.

We have reviewed your July 27, 1987 proposal and justification, and find them to be acceptable. PGE has adequately demonstrated that safe operation of the plant until May 1989, with the given main steam line wall thickness configuration, will not be compromised. A detailed discussion of our review will be provided to you in a forthcoming Safety Evaluation.

Sincerely, OrW M'd U Terence L. Cinn, Project Manager Project Directorate V Division of Reactor Projects - III, IV, Y and Special Projects i Office of Nuclear Reactor Regulation cc: See next page DRSP/PDV DRSP/PDV BC/ FE V DRS l JLee TChan:cd LMash]. GWK ighton j 8/ /87 8/N/87 8/J{/87 8/// /87 0FFICIAL RECORD COPY 8708250277 870821 PDR ADUCK 05000344 P PDR

v...

i

' Mr. David W. Cockfield Portland General Electric Company Trojan Nuclear Plant CC: .

Senior' Resident Inspector U.S. Nuclear Regulatory Commission

-Trojan Nuclear Plant Post Office Box 0 Rainier, Oregon 97048 Michael J. Sykes,-Chairman

, Board of County Commissioners Columbia County.

St. Helens, Oregon' 97501 Mr. David Kish Oregon Department of Energy

. Labor and Industries Building Room 111 Salem, Oregon 97310 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210

~ Walnut Creek, California 94596 i

'l 1

_ _ _ _ _ _ . . _ _ _ _ _ _ _ . _ . . _ _ _ _ - - . _ _ - - - - - - -