05000311/LER-1982-128, Forwards LER 82-128/01T-0.Detailed Event Analysis Encl

Forwards LER 82-128/01T-0.Detailed Event Analysis Encl

ML20066J035
Person / Time
Site:	Salem
Issue date:	11/10/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20066J038	List: 05000311/LER-1982-128, Forwards LER 82-128/01T-0.Detailed Event Analysis Encl
References
NUDOCS 8211230427
Download: ML20066J035 (4)

LER-2082-128, Forwards LER 82-128/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
3112082128R00 - NRC Website

text

.

O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station November 10, 1982 1

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 82-128/OlT 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 82-128/0lT. This report is required within fourteen (14) days of the occurrence.

Sincerely yours, l f.cYJ H. J. Midura General Manager -

, Salem Operations RF:ks CC: Distribution 8211230427 821110

, PDR ADOCK 05000311 S ppy The Energy People MO

% Jion CW/)1181

. a, Report Number: 82-128/0lT Report Date: 11-10-82 Occurrence Date: 10-31-82 Facility: Salem Generating Station, Unit 2 Public Sarvice Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDEhTIFICATION OF OCCURRENCE:

Contairaent Service Water Leak - No. 23 Containment Fan Coil Unit.

This report was initiated by Incident Report 82-377.

CONDITIONS IRIOR TO OCCURRENCE:

Mode 1 - Rx ?ower 82% - Unit Load 910 MWe.

DESCRIPTION OF OCCURRENCE:

At 1433 hours0.0166 days <br />0.398 hours <br />0.00237 weeks <br />5.452565e-4 months <br />, October 31, 1982, while performing a containment surveillance, an operator discovered a small service water leak of approximately .25 GPM on No. 23 Containment Fan Coil Unit (CFCU). The leak was isolated, and prompt notification was made to the NRC by telephone. Technical Specification Action State-ment 3.6.2.3a was already in force as of 0430 hours0.00498 days <br />0.119 hours <br />7.109788e-4 weeks <br />1.63615e-4 months <br />, October 31, 1982, when No. 23 CFCU was declared inoperable due to low service water flow (problems will be reported later with another LER) .

Both containment spray systems were operable throughout the occurrence.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Investigation of the problem revealed that the leakage was due to erosion 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 con-i ditions will be restricted such that site boundary radiation I

doses will be within the limits of 10CFR100.

1

. _ _ ~

LER 82-128/OlT . 4 .

ANALYSIS OF OCCURRENCE: (continued)

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 re-lease of radioactivity through the service water discharge. The occurrence, therefore, constituted 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 this equipment is necessary to ensure offsite radiation dose is maintained within the limits of 10CFR100.

Action Statement 3.6.2.3a requires:

With one group of CFCU's inoperable and both contain-ment spray systems operable, restore the inoperable group of cooling fans to operable status within 7 days, or be in at least hot standby within the next l 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 />.

Because the leakage was immediately isolated, containment integrity was maintained. Containment cooling capability was provided by the redundant CFCU's and containment spray systems. The occurrence, ,

therefore, involved no risk to the health or safety of the public.

Due to the loss of redundancy in design and engineered safety features, the event constituted operation in a degraded mode per-mitted by the limiting conditions for operation.

CORRECTIVE ACTION:

The leaking coil was blanked off, and the leakage was stopped.

Because No. 23 CFCU was still inoperable, Action Statement 3.6.2.3a remained in effect.

Design Change Request 2EC-0505 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 commitment to submit a Supplemental Report upon completion was made in LER 82-070/0lT.

. LE.R 82-128/OlT FAILURE DATA:

a A number of containment service water leaks due to similar failures of CFCU cooling coils have occurred since January

~

1, 1982.

1 Westinghouse Electric Corporation Containment Fan Coil Unit U-Tube Cooling Coil.

i Prepared By R. Frahm Gene' ray Mariager -

/[(k[4b SORC Meeting No.82-101 i

i 1

J 1

. _ _ _ _ . . _ . _ . _ . _ _ _ . . . _ _ . . . _ . _ . . . . , . , _ _ _ , . . . . . - . ,