05000311/LER-1982-078, Forwards LER 82-078/01T-0.Detailed Event Analysis Encl

Forwards LER 82-078/01T-0.Detailed Event Analysis Encl

ML20063L048
Person / Time
Site:	Salem
Issue date:	08/25/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20063L050	List: 05000311/LER-1982-078, Forwards LER 82-078/01T-0.Detailed Event Analysis Encl
References
IEB-80-24, NUDOCS 8209080608
Download: ML20063L048 (4)

LER-1982-078, Forwards LER 82-078/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
3111982078R00 - NRC Website

text

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O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station August 25, 1982

- Mr.

R.

C.

Haynes Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Haynes:

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-078/0lT Pursuant to the requirements of Salem Generating Station Unit No.

2,. Technical Specifications, Section 6.9.1.8.c, we are submitting Licensee Event Report for Reportable Occurrence 82-078/OlT.

This report is required within fourteen (14) days of the occurrence.

Sincerely yours, f.

wf c

H.

J. Midura General Manager -

Salem Operations RH:ksf67 CC:

Distribution 8209080608 820825 PDR ADOCK 05000311 S

PDR The Energy People p

96 2189 (?OM) 11-81

m.

Report Number:

82-078/0lT Report Date:

08-25-82 Occurrence Date:

08-19-82 Facility:

Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Containment Service Water Leak - No. 25 Containment Fan Coil Unit.

This report was initiated by Incident Report 82-219.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 82% - Unit Load 890 MWe.

DESCRIPTION OF OCCURRENCE:

At 2145 hours0.0248 days <br />0.596 hours <br />0.00355 weeks <br />8.161725e-4 months <br />, August 19, 1982, while checking accumulator sightglass level indication, the Equipment Operator discovered a service water leak within the containment.

An investigation was conducted and the leak was found to be from No. 25 Contain-ment Fan Coil Unit (CFCU) motor cooler.

Service water to the CFCU was isolated and the leakage was stopped.

No. 25 CFCU was declared inoperable, and Technical Specification Action Statement 3.6.2.3a was entered at 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br />.

In accordance with NRC IE Bulletin 80-24, the NRC was notified of the leak by telephone with written confirmation on August 20, 1982.

Both containment spray systems were operable throughout the occurrence.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Investigation of the problem showed that the leakage was due to the failure of the cooling coils.

The coils are fabricated of copper nickel alloy which is susceptible to erosion by silt laden service water.

Similar failures of other CFCU's have been noted, with most leaks occurring at bends where erosion is more significant.

ANALYSIS OF OCCURRENCE:

Primary containment is a design feature which ensures that the release of radioactive materials in the event of accident conditions will be restricted such that site boundary radiation doses will be within the limits of 10CFR100.

- 4

.LER 82-078/0lT ANALYSIS OF OCCURRENCE:NRC IE Bulletin 80-24 requires that any service water leak inside the containment be considered as a degradation of the containment boundary.

If containment pressure increased to the design pressure of 47 psig during an accident, there is a possibility of the release of radioactive materials through the service water discharge.

The occurrence therefore consti-tutes an abnormal degradation of the primary containment and is reportable in accordance with Technical Specification 6.9.1.8.c.

The CFCU's operate in conjunction with the containment spray systems to remove heat and radioactive contamination from the containment atmosphere in the event of a design basis accident.

Operability of either all fan coil groups or of both contain-ment spray systems is necessary to ensure offsite radiation dose is maintained within the limits of 10CFR100.

Because the leakage was immediately isolated, containment integrity was maintained.

Redundant containment cooling capability was provided by the containment spray systems.

The occurrence there-fore involved no risk to the health or safety of the public.

Due to the inoperability of the CFCU, the event constituted operation in a degraded mode permitted by a limiting condition for operation.

Action Statement 3.6.2.3.a requires:

with one group of containment cooling fans inoperable, restore the inoperable group of cooling fans to operable status within the next 7 days, or be in at least hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

CORRECTIVE ACTION

As noted, the leak was isolated and prompt notification was made to the NRC in accordance with Technical Specification 6.9.1.8.c.

No. 25 CFCU motor cooler was replaced and the CFCU was tested satisfactorily.

At 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />, August 23, 1982, No. 25 CFCU was declared operable and Action Statement 3.6.2.3.a was terminated.

Design Change Request 2EC-0507 has been issued to replace the CFCU cooling coils with coils manufactured of AL-6X steel, for improved erosion and corrosion resistance in the service water environment.

This change is scheduled for implementation during the next refueling outage.

A Supplemental Report will be submitted upon completion.

,LER 82-078/0lT,

FAILURE DATA:

Containment service water leaks due to the erosion of Service Water System components on CFCU's have occurred eight other times since January 1, 1982.

Westinghouse Electric Corporation Containment Fan Coil Unit

\\

U-Tube Cooling Coil l

r Prepared By R.

Heller

[

(4 g/ General M6 nager -

Salem Operations SORC Meeting No.

82-78 i

1