05000311/LER-1982-109, Forwards LER 82-109/01T-0.Detailed Event Analysis Encl

Forwards LER 82-109/01T-0.Detailed Event Analysis Encl

ML20063P382
Person / Time
Site:	Salem
Issue date:	09/29/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20063P383	List: 05000311/LER-1982-109, Forwards LER 82-109/01T-0.Detailed Event Analysis Encl 05000311/LER-1982-109-01, /01T-0:on 820923,svc Water Leakage of Approx 0.6 Gpm Discovered on Containment Fan Coil Unit 21 Cooling Coil. Caused by Erosion by Silt in Svc Water.Leaks Repaired W/ Blanked Flange & Belzona Metal Filler
References
NUDOCS 8210130351
Download: ML20063P382 (4)

LER-1982-109, Forwards LER 82-109/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
3111982109R00 - NRC Website

text

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.c0 PSEG Pubisc Service Electric and Gas Company P.O. Box E Hancocks Bridge. New Jersey 08038 Salem Generating Station September 29, 1982 Mr.

R.

C. Ilaynes 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 82-109/0lT 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 82-109/0lT.

This report is required within fourteen (14) days of th~e occurrence.

Sincerely yours, l

W7<h'eb#J H.

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Midura General Manager -

Salem Operations d[

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- Report Number:

- 8 2-109/01'T Report-' Date :

09-29-82 Occurrence Date:

09-23-82 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 82-285.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 Rx Power 65% - Unit Load 670 MWe.

DESCRIPTION OF OCCURRENCE:

At 1455 hours0.0168 days <br />0.404 hours <br />0.00241 weeks <br />5.536275e-4 months <br />, September-23, 1982, during routine operation,.

service water leakage offapproximately.0.6 GPM was discovered on the cooling coils of No. 21 Containment Fan' Coil Unit (CFCU).

The unit was isolated and immediate notification of the NRC was performed.

The CFCU was declared inoperable, and Technical Specification Action Statement 3.6.2.3.a was. entered, retroactive to.the. time of discovery.

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.duc

.to erosion of the cooling coils.

The coils are fabricated of' i.

copper nickel alloy, which is susceptible to erosion by silt i

laden service water.

Similar failures of other CFCU's have been noted, with most leaks. occurring at bends where erosion is more E

significant.

ANALYSIS OF OCCURRENCE:

(

Primary. containment is a design feature whi0h ensures that the

~

~ release of. radioactive materials in the eve.nt of accident con-ditions will be restricted-such that site boundary radiation

' doses-'will be within the limits of 10CFR100, i

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LER'82-109/OlT ', s

- tNRC,IE,Bulletin 80-24 requires thatiany service water leak'inside-the-containment be considered as a_ degradation of_the containment ^

boundary.- If containment pressure increased to the design pressure Lof1471psig during an' accident,,there is'a1 possibility of the.re-

_ lease oof ' radioactivity through the Laervice water discharge. < The occurrence,ftherefore,-constituted an abnormal _ degradation of the primary containment and-is.. reportable.in accordance with Technical Specification : 6. 9.1. 8. c.

The.CFCU's operato in conjunctionLwithzthe~ containment spray syst2ms 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 limite:of 10CFR100.

Action Statement 3.6.2.3.a requires:

With'one group of CFCU?s inoperable and both contain-ment spray systems operable,L restore the inoparable group of. cooling' fans to operable status'within 7 days, or1be 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 ofi redundancy in design and engineered-safety features, the event constituted operation in'a degraded mode permitted by the. limiting.

conditions for oparation.

CORRECTIVE ~ ACTIO'j:

i As noted,-the unit was immediately isolated and-prompt notification of the NRC was performed in accordance with Technical Specification 6.9.1.8.

Several leaks were located and were repaired utilizing blanks in the service water piping and Belzona metal filler.

No. 21-f CFCU was satisfactorily tested, the unit was declared operable, and Action-Statement 3.6.2.3.a was terminated at'0320 hours0.0037 days <br />0.0889 hours <br />5.291005e-4 weeks <br />1.2176e-4 months <br />, September 25,.1982.

Design Change Request 2EC-0505-has been issued to. replace the CFCU y

cooling; coils with coils manufactured-of AL-6X steel,.for. improved c

'erosioniand corrosion resistance in the: service water environment.

This change is scheduled for implementation during.the next refueling c

3 outage.

A commitment to submit a Supplemental. Report upon completion p =

'was made in LER 82-070/OlT.

e~

LER 82-109/OlT 6

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

.//. M2w General Ranager -

Salem Operations SORC Meeting No.

82-87 r

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