05000272/LER-1982-041, Forwards LER 82-041/03L-0.Detailed Event Analysis Encl

Forwards LER 82-041/03L-0.Detailed Event Analysis Encl

ML20071L054
Person / Time
Site:	Salem
Issue date:	07/21/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20071L056	List: 05000272/LER-1982-041, Forwards LER 82-041/03L-0.Detailed Event Analysis Encl
References
NUDOCS 8208020315
Download: ML20071L054 (4)

LER-2082-041, Forwards LER 82-041/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2722082041R00 - NRC Website

text

'O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station July 21, 1982 Mr. R. C. Haynes Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406 l

Dear.Mr. Haynes:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 82-041/03L j Pursuant to the requirements of Salem Generating Station Unit No. 1, Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 82-041/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours, I

f H J. Midura General Manager -

Salem Operations RF:ks 2' l CC: Distribution i

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l 8208020315 820721 i

PDR ADOCK 05000272 S PDR 1 4-

The Energy People 60 l swwu>nm

Report Number: 82-041/03L Report Date: 07-21-82 Occurrence Date: 06-26-82 i Facility: Salem Generating Station, Unit 1 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

No. 12 Charging Pump - Inoperable.

This report was initiated by Incident Report 82-161.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 98% - Unit Load 1100 MWe.

DESCRIPTION OF OCCURRENCE:

At 1706 hours0.0197 days <br />0.474 hours <br />0.00282 weeks <br />6.49133e-4 months <br />, June 26, 1982, during a routine inspection, an operator discovered water in the No. 12 Charging Pump gear oil reservoir. Subsequent analysis of samples confirmed that a water-oil mixture existed, and at 0329 hours0.00381 days <br />0.0914 hours <br />5.439815e-4 weeks <br />1.251845e-4 months <br />, June 27, 1982, No. 12 Charging Pump was declared inoperable. No. 13 Charging Pump was caution tagged and already inoperable.due to unidenti-fied noise during operation, therefore Technical Specification Action Statements 3.5.2.a and 3.1.2.4 were entered. No. 11 Charging Pump was operable, however, providing make-up, emergency core cooling and boron injection capabilities.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Service water had mixed with the gear oil through a leak in the i gear oil cooler. The cooler had prematurely failed as the result of excessive erosion and corrosion. Copper-nickle cooler tubes were susceptible to mechanical damage by silt particles in the service water system. The use of dissimilar metals in cooling system piping resulted in accelerated corrosion.

ANALYSIS OF OCCURRENCE:

The centrifugal pumps as part of Emergency Core Cooling Systems (ECCS) insure core peak cladding temperatures are maintained within limits during loss-of-coolant accidents. The charging pumps also provide post-accident cooling in the recirculation mode. Associated with a boron injection flow path, the pumps insure a minimum shutdown margin of 1.6% delta k/k during Xenon decay and cooldown to 200 F.

LER 82-041/03L o ANALYSIS OF OCCURRENCE: (continued)

As noted, one centrifugal charging pump was operable, and consequently no risk to the health or safety of the public was involved. The occurrence, therefore, constituted operation in a degraded mode permitted by a limiting condition for operation and is reportable in accordance with Technical Specification 6.9.1.9.b.

Action Statement 3.5.2.a requires:

With one ECCS subsystem inoperable, restore the inoperable subsystem to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

Action Statement 3.1.2.4 requires:

With only one charging pump operable, restore at least two ca.arging pumps to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, or be in at least hot standby and borated to a shutdown margin equivalent to at least 1% delta k/k at 200 F within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

CORRECTIVE ACTION:

The failed cooler was replaced with a spare of similar design and materials. An elbow and length of service water piping immediately downstream of the cooler were found to be deteri-orated, and were also replaced. A visual inspection of gear box components was made; no damage was noted. The gear box was flushed and refilled with new oil, and a visual check showed no leakage existed. Subsequent analysis of gear oil samples confirmed this conclusion. No. 12 Charging Pump was declared operable, and at 2230 hours0.0258 days <br />0.619 hours <br />0.00369 weeks <br />8.48515e-4 months <br />, June 27, 1982, Action Statements 3.5.2.a and 3.1.2.4 were terminated.

A number of failures of charging pump oil coolers and asssciated service water piping have occurred in the past. Design Change Requests (DCR's) lEC-1430 and 1SC-0743 have been issued to install stainless steel / titanium coolers and stainless piping, which are better suited to use in the Service Water System. Parts for the DCR's have been ordered, and the changes will be completed as the materials become available. The gear oil cooler had previously failed in January, 1982, and it is expected that the present unit will perform satisfactorily until completion of the DCR's.

LER 82-041/03L .

FAILURE DATA:

No. 12 Charging Pump was inoperable, due to deteriorated service water piping, on-three occasions in the last year.

The lube oil cooler had failed for similar reasons in February, 1981.

Pacific Pumps Horizontal Centrifugal Pump Gear Oil Cooler ,

Prepared By R. Frahm y- W jk "'

& General Manager -

Salem Operations SORC Meeting No. 82-69

.