05000272/LER-1979-046, Forwards Updated LER 79-046/01X-1

Forwards Updated LER 79-046/01X-1

ML18081A677
Person / Time
Site:	Salem
Issue date:	11/10/1979
From:	Librizzi F Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18081A678	List: 05000272/LER-1979-046, Forwards Updated LER 79-046/01X-1 05000272/LER-1979-046-01, Linear Indications in Weld Areas on Steam Generations 11,12,13 & 14 Discovered. Caused by Corrosion.Corrective Action Explained in Response to IE Bulletin 79-13
References
NUDOCS 7912040414
Download: ML18081A677 (3)

LER-1979-046, Forwards Updated LER 79-046/01X-1

Event date:
Report date:
2721979046R00 - NRC Website

text

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Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /430-7000 Mr. Boyce H. Grier Director of USNRC November 10, 1979 Off ice of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 79-46/0lT SUPPLEMENTAL REPORT Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1, we are submitting supple-mental Licensee Event Report 79-46/0lX-l.

Sincerely yours,

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F. P. Librizzi General Manager -

Electric Production CC:

Director, Office of Inspection and Enforcement (30 copies)

Director, Office of Management Information and Program Control (3 copies) u:111sor sm11n:

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Report Number:

e 7 9-4 6/ O_lX-1 Report Date:

11/10/79 Occurrence Date:

6/14/79 Salem Generating _Station Facility:

Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Linear Indications in Steam Generator Feedwater Nozzle Welds CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 6 -

Refueling DESCRIPTION OF OCCURRENCE:

As a result of a report of through-wall leakage evidenced in the area of the steam generator nozzle to piping connection at another utility, we examined the corresponding area on our No. 13 steam generator.

This examination by radiography (RT) revealed crack-like indications.

RT and UT exams then undertaken on the feedwater nozzle to pipe fitting weld and adjacent base material on No. 11, 12, 13 and 14 steam generators revealed crack-like indications in all feedwater nozzle to pipe fitting weld areas.

As directed by IE Bulletin 79-13, we initiated a program to volumetrically examine the weldments and adjoining base material in the feedwater system_ of Salem No. 1 Unit, the results of which have been reported in our response to IE Bulletin 79-13.

DESIGNATI.ON OF APPARENT CAUSE OF OCCURRENCE:

Metallurgical investigations performed by Westinghouse at their R&D Center have confirmed the existence of circumferential cracks in all four loops and.indicated them to have been caused by cyclic stresses assisted or accompanied by corrosion.

The geometry of the cracks and their surface appearance suggests that thermal fatique is the dominant causal mechanism.

ANALYSIS OF OCCURRENCE:

The replacement of the cracked portions of the feedwater lines has been accomplished using the same design with similar materials and welding procedures as were used during the construction of the plant.

As such, the probability of occurrence of the consequences of an accident or malfunction of equipment important to safety previously evaluated in the Safety Analysis report has not been increased, the possibility for an accident or malfunction of a different type than any evaluated previously in the safety analysis report has not been created and the margin of safety as defined in the basis for any Technical Specification has not been reduced.

We, therefore, conclude that this pipe crack repair is not an unreviewed safety question.

LER 79-46/0lX-l CORRECTIVE ACTION:

Extensive corrective action has been undertaken to correct identified problems and to prevent reoccurrence.

The measures taken and ongoing programs are fully explained in our response to IE Bulletin 79-13.

FAILURE DATA:

See Public Service response to IE Bulletin 79-13.

Prepared By A. W. Kapple SORC Meeting No.

82-79 Manager -

Salem Generating Station