05000311/LER-1982-100, Forwards LER 82-100/01T-0.Detailed Event Analysis Encl

Forwards LER 82-100/01T-0.Detailed Event Analysis Encl

ML20063N818
Person / Time
Site:	Salem
Issue date:	09/22/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20063N819	List: 05000311/LER-1982-100, Forwards LER 82-100/01T-0.Detailed Event Analysis Encl
References
NUDOCS 8210070249
Download: ML20063N818 (4)

LER-2082-100, Forwards LER 82-100/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
3112082100R00 - NRC Website

text

> I 4n] ,O PSEG Public Service Electric and Gas Corrpany P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station September 22, 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 82-100/0lT 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 82-100/0lT. This report is required within fourteen (14) days of the occurrence.

Sincerely yours, l , %( <b v'V H. J. Midura General Manager -

Salem Operations RF:ksf,D[

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Report Number: 82-100/0lT Report Date: 09-22-82 i Occurrence Date: 09-15-82 Facility: Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Containment Service Water Leak - No. 22 Containment Fan Coil Unit.

This report was initiated by Incident Report 82-278.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 81% - Unit Load 900 MWe.

DESCRIPTION OF OCCURRENCE:

At 1930 hours0.0223 days <br />0.536 hours <br />0.00319 weeks <br />7.34365e-4 months <br />, September 15, 1982, following planned maintenance on No. 22 Containment Fan Coil Unit (CFCU), a small service water leak of approximately 0.3 GPM was discovered emanating from a secondary coil. The leak was isolated and the NRC was immediately notified by telephone. No. 22 CFCU had been taken out of service at 1117 hours0.0129 days <br />0.31 hours <br />0.00185 weeks <br />4.250185e-4 months <br />, September 15, 1982, for repair of a previous leak which had been temporarily isolated with a blank in the service water piping. Technical Specification Action Statement 3.6.2.3.a had been entered at that time, and remained in effect. A service water leak was subsequently discovered on No. 21 CFCU at 0033 hours3.819444e-4 days <br />0.00917 hours <br />5.456349e-5 weeks <br />1.25565e-5 months <br />, September 16, 1982, and Action Statement 3.6.2.3.b was entered (see LER 82-101/0lT). Both containment spray systems were operable throughout the occurrence providing containment cooling capability.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Investigation of the problem revealed that the leakage was due 1 to erosion of the cooling coils The coils are fabricated of l copper nickel alloy, which is se ceptible 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 1

.more significant. I l

ANALYSIS OF OCCURRENCE:

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

I

LER 82-100/0lT .

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 release of radioactivity through the

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service water discharge. The occurrence, therefore, consti-tuted 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 containment spray systems is necessary to ensure offsite radiation doso 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 I 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 />.

l Action Statement 3.6.2.3b requires:

With two groups of containment cooling fans inoperable, restore at least one group of cooling fans 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 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 />.

Because the leakage was immediately isolated, containment integrity was maintained. Containment cooling capability was provided by the 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 permitted by the limiting

( conditions for operation.

CORRECTIVE ACTION:

As noted, the leakage was immediately isolated and prompt noti-fication of the NRC was performed in accordance with Technical Specification 6.9.1.8. The leaking coil was repaired with Belzona metal filler, and No. 22 CFCU was satisfactorily tested.

No. 22 CFCU was declared operable at 1852 hours0.0214 days <br />0.514 hours <br />0.00306 weeks <br />7.04686e-4 months <br />, September 16, 1982, and Action Statement 3.6.2.3b was terminated. Since No. 21 CFCU was still inoperable, Action Statement 3.6.2.3a remained in effect.

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LER 82-103/0lT ' CORRECTIVE ACTION: (continued)

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 j 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.

FAILURE DATA:

A number of containment service water leaks due to similar failures of CFCU cooling coils have occurred since January 1, 1982.

Westinghouse Electric Corporation Containment Fan Coil Unit

' U-Tube Cooling Coil Prepared By R. Frahm /

Generai Manager -

Salem Operations SORC Meeting No. 82-85 l

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