ML20249B190

PNO-76-053:on 980323,licensee Conducting Nondestructive Volumetric Exam of Austenitic Stainless Steel Pipe bends,2 Inches or Greater in Diameter,Which Had Been Cold Worked W/O Subsequent Solution Annealing

ML20249B190
Person / Time
Site:	Nine Mile Point
Issue date:	03/25/1976
From:	Dreher F, Roy G, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-76-053-01, PNO-76-53-1, NUDOCS 9806220152
Download: ML20249B190 (1)

Text

- g [( g a fg m % " March 25, 1976 PRELIMINARY NOTIL .ATIug 07 EVEl OR US C . JNCL -PNO-76-53 This preliminary notification constitutes EARLY tice of events of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation l and is basically all that is known by OIE staff as of 10:00 am on date of this notification. IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFOR'!ATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY WILL BE ISSUED IF WARRANTED.

Facility: Nine Mile Point Unit 1 (DN 50-220) '

, . Niagara, Mohawk Power Corporation (NMPC)

Subject:

CRACKS IN ISOLABLE PORTION OF REACTOR WATER CLEANUP SYSTEM PIPING The licensee is conducting a nondestructive volumetric examination of austenitic stainless steel pipe bends, 2 inches or greater in diameter, which had been cold worked without subsequent solution annealing. This action is in compliance with the Region I, Philadelphia, Immediate Action letter to NMPC dated March 23.

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, Cracks have been identified in four (4) additional sections of six (6) inch diameter, schedule 80, type 304, Reactor Water Cleanup System (RWCUS)

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Pipe bends. The cracks are on the inside diameter of the pipe bends. They are longitudinal and transverse, up to one inch in length and penetrate a maximum of one third of the. wall thickness. As the cracks found earlier, all are located in isolable sections of the RWCUS.

The licensee has completed the examination of bends in similar six inch diameter RWCUS piping and three inch diameter control rod drive piping i inside the drywell. All of these bends were found satisfactory.

, The licensee reports difficulty in locating replacement material.

Media interest is expected because of prior press coverage of this O y

t occurrence. The licensee issued a press release on the shutdown, including /

j the cause. A press release by NRC is not planned at this time.

dY NRC, Region I, 1 philadelphia, Pennsylvania received notification of this g

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occurrence by telephone from the licensee at 1615, March 25, 1976. g

Contact:

FADreher, IE x27261 GWRoy, IE x27261 DThompson, IE x27541 Distribution:

Chairman Anders Commissioner Mason S. J. Chilk, SECY Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE Commissioner Kennedy C. C. Kammerer, CA 4

g L. V. Gossick, J. G. Davis, OIE J. A. Harris, PA B. C. Rusche, NRR J. La Fleur, ISP T. J. McTiernan, AIA K. R. Chapman, NMSS H. K. Shapar, ELD Transmitted: P Bldg /dl3dA; H St /ON INBB /d 9, Luge /77 c7 ,

PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE

.G 9006220152 760325 - - - - - - - - - -

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PNO-76-053 PDR -

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