05000311/LER-1982-101, Forwards LER 82-101/01T-0.Detailed Event Analysis Encl

Forwards LER 82-101/01T-0.Detailed Event Analysis Encl

ML20063N794
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
ML20063N795	List: 05000311/LER-1982-101, Forwards LER 82-101/01T-0.Detailed Event Analysis Encl 05000311/LER-1982-101-01, /01T-0:on 820916,svc Water Leakage Discovered in Cooling Coils of Containment Fan Coil Unit 21.Caused by Excessive Erosion of Cooling Coils by Silt.Coils Repaired. New Design Coils Will Be Installed During Next Refueling
References
NUDOCS 8210070221
Download: ML20063N794 (4)

LER-1982-101, Forwards LER 82-101/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
3111982101R00 - 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

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September 22, 1982 l

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 82-101/0lT 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 82-101/0lT.

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

Sincerely yours, H.

J. Midura General Manager -

Salem Operations RF:ks [ h CC:

Distribution l

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( 821'0070221 B20922 I PDR ADOCK 05000311 C_E PDR The Energy People 95 2189 (20M) 1181

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9 Report Number:

82-101/0lT Report Date:

09-22-82 Occurrence Date:

09-16-82 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 82-278.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 82% - Unit Load 900 MWe.

DESCRIPTION OF OCCURRENCE:

At 0033 hours3.819444e-4 days <br />0.00917 hours <br />5.456349e-5 weeks <br />1.25565e-5 months <br />, September 16, 1982,,during an inspection of the Containment Building, an operator discovered service water leakage of approximately 0.5 GPM on No. 21 Containment Fan Coil Unit (CFCU).

The unit was isolated and the NRC was noti-fied by telephone at 0039 hours4.513889e-4 days <br />0.0108 hours <br />6.448413e-5 weeks <br />1.48395e-5 months <br />.

Since No. 22 CFCU was in-operable with a service water leak (see LER 82-100/OlT), Technical Specification Action Statement 3.6.2.3.a was in effect.

With two CFCU's inoperable, Action Statement 3.6.2.3.b was entered.

Both containment spray systems were operable throughout the occur-rence providing containment cooling capability.

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.

LER 82-101/0lT.

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 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 Spscification 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 3.6.2.3a requires:

With one group of CFCU's inoperable and both containment 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 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 />.

Action Statement 3.6.2.3b requires:

With two groups of containment cooling ft s inoperable, restore at least one group.

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 on No. 21 CFCU was immediately isolated and prompt notification of the NRC was performed in accordance with Technical Specification 6.9.1.8.

No. 22 CFCU had beentropaired and declared operable at 1852 hours0.0214 days <br />0.514 hours <br />0.00306 weeks <br />7.04686e-4 months <br />, September 16, 1982.

Action Statement 3.6.2.3b was terminated at that time; Action Statement 3.6.2.3a remained in effect, however.

Investigation of the problem with No. 21 CFCU showed that actually five small leaks were in-volved.

The leaks were repaired utilizing Belzona metal filler and a blank in the service water piping.

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LER 82-101/OlT.

CORRECTIVE ACTION

The unit was satisfactorily tested and returned to service.

No. 21 CFCU was declared operable and Action Statement 3.6.2.3.a was terminated at 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br />, September 18, 1982.

Design Change Request 2EC-0505 has been issued to replaqe 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/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 Coi) Unit U-Tube Cooling Coil Prepared By R. Frahm

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'GeWeral Manager -

Salem Operations SORC Meeting No.

82-85 e

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