05000336/LER-1978-019, Forwards LER 78-019/03X-2

Forwards LER 78-019/03X-2

ML19273B912
Person / Time
Site:	Millstone
Issue date:	06/14/1979
From:	Opeka J NORTHEAST UTILITIES
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19273B913	List: 05000336/LER-1978-019, Forwards LER 78-019/03X-2 05000336/LER-1978-019-03, /03X-2 on 780803:while Operating 13U Diesel for Surveillance,Leaking Injector Pump Observed.Caused by Elemental Lead Inclusions,Resulting in Stress Risers at Surface of Valve Cages
References
MP-2-4050, NUDOCS 7906180495
Download: ML19273B912 (1)

LER-1978-019, Forwards LER 78-019/03X-2

Event date:
Report date:
3361978019R00 - NRC Website

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.2l June 14, 1979 f1P 4050 11r. Boyce 11. Grier Director, Region I Office of Inspection and Enforcement U. S. !!uclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Reference:

Facility Operation License fio. DPR-65 Docket I!o. 50-336 Reportable Occurrence R0-50-336/78-19/3X-2

Dear fir. Grier:

This letter fontards update Licensen Event Report 78-19/3X-2 pursuant to flillstone Unit 2, Appendix A Technical Specifications, Section 6.9.1.7. The report concerns the inoperability of one of the two emergency diesel generators due to leaking injector pumps.

An additional three copies of the repart are enclosed.

Yours truly, c

tt /A.

.F Opeka Station Superintendent flillstone !!uclear Power Station JF0/ RAS:lln

Attachment:

LER 78-19/3X-2 cc: Director, Of fice of Inspection and Enforccment, Washington, D.C. (30)

Director, Office of f4nagement Infonaation and Program Control.

Ilashington, D.C. (3) 2354 040 7906180ye)$

ATTACHMENT LER 78-019/03X-?

Millstone Unit 2 Docket No. 50-336 EVEllT DESCRIPTION While operating the 13U diesel for surveillance, a leaking injector pump was observed.

In accordance with Technical Specification, Section 3.8.1.1, action statement (a), the 120 diesel was declared inoperable and the operaJhility of the remaining A.C. sources was verified.

The diesel is a Fairbanks - Morse l'odel 38TD8-1/8, and is rated at 2,750 kilowatts.

The failed part was an injector pump valve ctge, part number 116103127.

A second failure of a valve cage occurred on 1/25/79; CAUSE DESCRIPTION An analysis of the discharge valve cages by tne vendor, Fairbanks-Morse, revealed that the cause of the failures was elemental lead inclusions or stringers which ran longitudinally along the inside diameters of the valve cages.

These inclusions resulted in stress risers at the surface of the valve cages.

The stress concentration of the nonnal cyclic stress was sufficient to induce fatigue failure.

The immediate corrective action was to replace the valve cages.

Following the second failure all the discharge valve cages on the 13U diesel were visually inspected and no evidence of cracking was found. As permanent corrective action the vendor will upgrade his material inspections to preclude the use of any material for the manufacture of valve cages which shows the presence of lead inclusions.

JF0/ RAS:lla 2354 041