ML20053E786

RO 82-009 Re Failure of Four Feedwater Sys Pipe Supports. Final Rept Cannot Be Completed by 820601 Due Date. Metallurgical Analysis Revealed Excessive Sidewise Movement of 10-inch Feedwater Line Resulted in Fatigue Cracking

ML20053E786
Person / Time
Site:	San Onofre
Issue date:	06/01/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
RO-82-009, RO-82-9, NUDOCS 8206100078
Download: ML20053E786 (2)

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Southern California Edison Company J

S A N OfeOF RE NUC L E A R GE NE R A TING S T A TION p

P.O. D o m 1211 S A N C LEME N T E, C A LIF CR Nie 92472 0, [ ((.

H. B. R A'/

T E L E PHONE

$ f A 1 s O N M A N ". G E. A i1146492?700 June 1, 1982 U. S. Nuclear Regulatory Commission Cffice of Inspection and Enforcement Regien V 1450 f' aria Lane, Suite 210 Wainut Creek, California 94596 - 5368 Attention:

Mr. R. H. Engelken, Regional Administrator

Subject:

Docket No. 50-206 LER No.82-009 San Onof a Nuclea1 Ceneratinc Statico, Unit 1

References:

1)

Letter, H. B. Ray (SCE) to R. H. Eng21 ken (NRC),

Prcept R2 port Concerning Weld Feilures on Feecuater System Pipe Supports, dated April 5, 1932.

2)

Letter, H. B. Ray (SCE) to R H. Engeiken (NRC),

Fourtuan Day Report Concerning Weld Failures on Feein ter System Pipe Supports, dated April 16, 1932.

TFis letter is a folicw-up report to References 1 ard 2 which involve the failure of four feedwa.er system pipe sunports.

In Reference 2 ne indicated that a final report on this matter would ce submitted cy Jur.e 1, 1932; however, sevaral npects of this situation remain to be completed.

As a rn u i t of a conversation with Mr. Dennis Kirscn of your of f"ce en May 25, 1922, it has been decided to sC;ait this interim report, with the final report to be forwarded to you on or about July 1, 1932.

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d C8 R.H. Engellen June 1, 1932 Reference 2 icentified two corrective actions as 1) perf ormance of a matallurgical analysis of all four supports and 2) replacement of the failed supports. A rretallurgical aralysis of on2 of the f311ed pipe supports considered typical of all four has b'en cccplowd nd has Ird to the r

conclusion that excus:.h:> si&;i se movtre rt of the ter.-inch fecdsator line r;sulted in fatipe cracking of the pipe suppcrt.

Replacer. cat of the failed supports is underway.

TFe fir:al report on this natter will be submitted on or about July 1, 1932.

Sincertly, HT)f l '11thw cc:

U. S Nucicar Regulatory Commission Office of Inspection and Enforcement U. 5. Nucicar Regulatory Cctroission Office of Man % ment Information and Progra"1 Control (iiiPC)

Institute of Nuclear Power Operations (INPC)

L F. Miller - (USNRC Resident Ir.spector - San Onofre Unit 1) l l

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