05000311/LER-1982-092, Supplemental LER 82-092/01X-1:on 820908,svc Water Leak Discovered on Containment Fan Coil Unit 21,rendering Unit Inoperable.Caused by Motor Cooler Erosion Due to Silt in Svc Water.Cooler Replaced

Supplemental LER 82-092/01X-1:on 820908,svc Water Leak Discovered on Containment Fan Coil Unit 21,rendering Unit Inoperable.Caused by Motor Cooler Erosion Due to Silt in Svc Water.Cooler Replaced

ML20077F202
Person / Time
Site:	Salem
Issue date:	06/29/1983
From:	Frahm R, Zupko J Public Service Enterprise Group
To:	Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-82-092-01X, LER-82-92-1X, NUDOCS 8308010292
Download: ML20077F202 (5)

LER-2082-092, Supplemental LER 82-092/01X-1:on 820908,svc Water Leak Discovered on Containment Fan Coil Unit 21,rendering Unit Inoperable.Caused by Motor Cooler Erosion Due to Silt in Svc Water.Cooler Replaced

Event date:
Report date:
3112082092R00 - NRC Website

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LICENSEE EVENT REPORT

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l1 l 0 l lThe cause was erosion of the CFCU motor cooler by silt in the service water. The motor l pooler was replaced, No. 21 CFCU was tested satisfactorily, No. 25 CFCU wtE: also g pepaired, and all Action Statements were terminated. Design Change Request 2EC-0507 l 3 gwas issued and the cooler was replaced with one of a more erosion resistant material. l 11 141 l I 7 ee so SAIUS  % POWE R OTHER STATUS OIS RY DISCOVERY DESCRIPTION 1 5

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Report Number: 82-092/0lX-1 l  : Report Date: 06-29-83~

, Occurrence Date: 09-08-82 i

Facility : Salem Generating-Station, Unit 2 3

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 82-262.

CONDITIONS PRIOR TO OCCURRENCE:

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

DESCRIPTION OF OCCURRENCE:

On September 8, 1982, during routine operation, the Control Room Operator = received indication of leakage within the contain-ment. A containment entry was made to determine the source of leakage. At 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br />, it was discovered'that No. 21 Contain-ment Fan Coil Unit (CFCU) motor cooler had a service water' leak of'approximately 0.3 GPM. No. 21 CFCU was declared inoperable-l and isolated. At this time, Limiting Condition for Operation-j -Action Statement 3.6.2.3b was already in' force, due-to No. 22-and No. 25 CFCU's being inoperable. . Action Statement.3.6.2.3

, permits operation with up to'two.CFCU groups. inoperable.- Inoper-

. ability of No. 21 CFCU created ~a condition of Dthree CFCU groups .

inoperable. Therefore, at 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br />,. September 8, 1982, Action

] Statement 3.0.3 was entered and a unit load reduction was commenced in compliance with the action statement.

l The NRC was notified by telephone with written confirmation trans-mitted.on September 8, 1982, in compliance.with NRC IE Bulletins.

i: 80-24 and 81-09. .Both containment spray systems'were operable

, throughout the occurrence. 'At 0715Lhours, September 8,-1982,~No.

22 CFCU was declared operableand Action Statement 3.0.3 was

. terminated. The' conditions of Limiting Condition for~ Operation l Action Statement 3.6.2.3b were then applicable, ' and the unit load -

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reduction was terminated ~at:76% reactor power. HNo. 21'CFCU motor cooler was : replaced l and - the CFCU was . tes ted satisf actorily. Atl0005 hours, September 19,:1982,1No.'21 CFCU was declared operable ~and

Limiting

Condition for Operation Action ~ Statement 3.6.2.3b wasL

terminated. No.~25 CFCU' remained' inoperable'for maintenance and-

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, , J/ R 82-09 2/0lX-1 DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Investigation of the problem showed that the leakage on No. 21 CFCU motor cooler was due to the failure of the cooling coils.

The coils are fabricated of copper nickel alloy which is sus-ceptible to erosion by silt laden service water. Similar failures of other CFCU's had been noted, with most leaks occurring at bends where erosion is more significant. No. 25 CFCU was inoperable due to being tagged out for scheduled maintenance and was therefore not a reportable occurrence. No. 22 CFCU was inoperable due to a service water flow problem and was addressed in LER 82-105/03L.

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. NRC IE Bulletin 80-24 requires that any service water leak inside the containment be considered as a degradation of the containment boundary. If contain-ment 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 constitutes an abnormal degradation of the primary con-tainment 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 undue risk to the health or safety of the public.

Action Statement 3.0.3 requires :

When a Limiting Condition for-Operation is not met, except as provided by the associated action require-ments, within one hour action shall be initiated to place the unit in a mode in which the specification does not apply by placing it in 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 />, or in hot shutdown within the following 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 subsequent 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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LER 82-092/0lX-1 .- . 1 ANALYSIS OF OCCURRENCE: (continued)

Action Statement 3.6.2.3b requires:

With two groups of CFCU's inoperable, and both containment spray systems operable, restore at least one group of CFCU's 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 />. Restore both required CFCU's to operable status within 7 days .

of initial loss 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 3.6.2.3a requires:

With one group of the 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 />.

CORRECTIVE ACTION :

As noted, the leak on No. 21 CFCU was isolated and prompt noti-fication was made to the NRC in accordance with Technical Speci-fication 6.9.1.8.c. No. 21 CFCU motor cooler was replaced and the CFCU was tested satisfactorily. At 0005 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />,' September 9, 1982, No. 21 CFCU was' declared operable and Action Statement 3.6.2.3b was terminated. No. 25 CFCU was still inoperable for maintenance, therefore, the conditions of Limiting Condition for Operation Action Statement 3.6.2.3a were then applicable.

Design Change Request 2EC-0507 was submitted to replace the CFCU motor cooler cooling coils with coils manufactured of AL-6X steel or titanium for improved erosion and corrosion resistance in the service water environment. The change was completed June 1983-during the first Salem Unit 2 refueling; all CFCU motor cooler' coils were replaced with ones of improved material.

FAILURE DATA:

l Westinghouse Electric Corporation Containment Fan Coil Unit U-Tube Cooling Coil Prepared By R. Frahm 4- p V[/ General M4hager'-

Salem Operations SORC Meeting No.83-086

.;.g PSEG Pubhc Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Saler9 Generating Station July 7, 1983

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Mr. J. Allan Acting Regional Administrator USNRC Region 1 i 631 Park' Avenue

. King of Prussia, Pennsylvania 19406

Dear Mr. Allan:

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-092/OlX-1 SUPPLEMENTAL REPORT Pursuant to the requirements of Salem Generating Station Unit No. 2 Technical Specifications, Section 6.9.1.8.c, we are submitting supplemental Licensee Event Report'for Reportable Occurrence 82-092/0lX-1.

Sincerely yours,

/

e J. M. Zupko, Jr.

General Manager -

Salem Operations RF:ks CC: Distribution -

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