ML20236W865

PN-75-150:on 751213,GPC Notified Region 2 by Phone Re 2 Apparent Cracks Identified in 4 Inch Diameter Bypass Loop Around Loop a Recirculation Pump Discharge Valve.Licensee Replaced Pipe Tee & 1 Ft of 4 Inch Pipe

ML20236W865
Person / Time
Site:	Hatch
Issue date:	12/15/1975
From:	Jennifer Davis, Gower G, Roy G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PN-75-150, NUDOCS 9808060259
Download: ML20236W865 (1)

Text

A 7;w u Of f.)<"y ygg PRELIMINARY NOTIFICATION a.

- NOT FOR FUBLIC DISCLOSURE -

December 15, 1975 1:L i PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE --PN-75-150 l

This preliminary notification constitutes EARLY notice of events of

> POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by OIE staff as of 3:00 p.m. on the date of this notification. IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT NOTIFICATION OF AN INCIDENT OR OCOURRENCE (BLUE SHEET) SUBSEQUENTLY

~WILL BE ISSUED IF WARRANTED.

Facility:' Edwin 1. Hatch Unit No. 1-Georgia Power Company

Subject:

CRACKS IN 4 - INCH RECIRCULATION PIPING Georgia Power Company notified Region II by telephone on December 13,  ;

1975, that two apparent cracks were identified in the 4 - inch diameter i  !

bypass loop around the loop "A" recirculation pump discharge valve.  !

The cracks were identified during a scheduled inservice inspection. r The cracks are located in the 4 - inch pipe $n the heat affe'eted zone of the upstream weld of the pipe tee, upstream of the bypass loop h

isolation valve. The cracks are transverse and approximately one

~f ~

inch long. The cracking is from the inside and had not perforated

(- the pipe.

l The licensee is replacing the pipe tee and one foot of 4 - inch pipe.

All other wolds in loop "A" and loop "B" 4 - inch bypass lines were inspected and no other crack indications were identified.

A Region II inspector with metallurgical background has been dispatched to the Hatch site to evaluate the cracking problem and the proposed fix.

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Neither the licensee nor Region II plan to make a press release.

h Region II received notification by telephone call from the licensee o on December 13, 1975, at 12:20 p.m.

Contact:

GCGower, IE x27261 GWRoy, IE x27253 JGDavis, IE x27541

• n $ Distribution: ,

S . J . Chilk, SECY

• L Chairmin Anders Commissioner Mason N Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE

$ Commissioner Kennedy C. C. Kammerer, CA 0- ,

_ ; J D . F . Knuth, IE J. A. Harris, PA

, B. C. Rusche, NRR J. La Fleur, ISP T. J. Mc'Jiernan, AIA

%N I$gL.V.Gossick,EDO K. R. Chapman, NMSS H. K. Shapar, ELD Nk Transmitted: P Bldg # ; H St 3  ; MNBB  ; Luge,4,v [

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PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DI3 CLOSURE