05000311/LER-1982-119, Forwards LER 82-119/01T-0.Detailed Event Analysis Encl

Forwards LER 82-119/01T-0.Detailed Event Analysis Encl

ML20065T133
Person / Time
Site:	Salem
Issue date:	10/20/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20065T135	List: 05000311/LER-1982-119, Forwards LER 82-119/01T-0.Detailed Event Analysis Encl
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Download: ML20065T133 (4)

LER-1982-119, Forwards LER 82-119/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
3111982119R00 - NRC Website

text

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l O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038.

Salem Generating Station October 20, 1982 Mr.

R.

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

Dear Mr. Haynes:

LICENSE NO. DP R-7 5 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-119/GlT 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 82-119/OlT.

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

Sincerely yours,

/*

N H.

J. Midura l

General Manager -

Salem Operations RF:ks 4 CC:

Distribution 4

W-gl%0230 821020 OCK 05000 S

The Energy People g

- - ei

J.

Report Number:

82-119/OlT Report Date:

10-20-82 Occurrence Date:

10-08-82 Facility:

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

Containment Service Water Leak - No. 21 Containment Fan Coil Unit.

This report was initiated by Incident Report 82-319.

F CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 81% - Unit Load 910 MWe.

DESCRIPTION-OF OCCURRENCE:

At 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br />, October 8, 1982, while performing a containment surveillance, an operator discovered a small service water-leak of approximately 0.5.GPM on No. 21 Containment Fan Coil Unit (CFCU).

No. 21 CFCU was declared inoperable and the leak was isolated.

Prompt notification was made to the NRC by telephone at 1445 hours0.0167 days <br />0.401 hours <br />0.00239 weeks <br />5.498225e-4 months <br />,.in accordance with NRC IE Bulletin 80-24, with written. confirmation. transmitted on October 12, 1982.

Technical Specification Action Statement 3.6.2.3a was already in force as of 1605 hours0.0186 days <br />0.446 hours <br />0.00265 weeks <br />6.107025e-4 months <br />, October 7, 1982, because No. 22 CFCU was out of service for planned maintenance.

With another CFCU group inoperable, l

Action Statement 3.6.2.3b was entered retroactive to the time of discovery.

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-ditions will be restricted such that site boundary radiation doses will be within the limits of 10CFR100.

i

m LER 82-119/0lT -

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

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

The leaking coil was repaired utilizing Belzona metal filler and No. 21 CFCU was satisfactorily tested.

No. 21 CFCU was declared operable and Action Statement 3.6.2.3b was terminated as 2030 hours0.0235 days <br />0.564 hours <br />0.00336 weeks <br />7.72415e-4 months <br />, October 9, 1982.

No. 22 CFCU was still inoperable, and 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.

LER 82-119/OlT 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

. /r/

M G6ner'al Manager -

2 Salem Operations SORC Meeting No.82-94B