05000311/LER-1982-058, Forwards LER 82-058/03L-0.Detailed Event Analysis Encl

Forwards LER 82-058/03L-0.Detailed Event Analysis Encl

ML20071L166
Person / Time
Site:	Salem
Issue date:	07/21/1982
From:	Frahm R, Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20071L169	List: 05000311/LER-1982-058, Forwards LER 82-058/03L-0.Detailed Event Analysis Encl
References
NUDOCS 8208020353
Download: ML20071L166 (3)

LER-2082-058, Forwards LER 82-058/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3112082058R00 - NRC Website

text

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s O PSEG Publi6 Service Electric and Gas Company P.O. Box E Hancocks Er dge, New Jersey 08038 Salem Generating Station July 21, 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 82-058/03L Pursuant to the requirements of Salem Generating Station Unit No. 2, Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 82-058/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours, y

H. J. Midura General Manager -

Salem Operations RF:ksf.d[

CC: Distribution Thn Co nr~. n-- -

G208020353 820721 m> newe* 1tei PDR ADOCK 05000311

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4 Report Number: 82-058/03L Report Date: 07-21-82 Occurrence Date: 07-02-82 Facility: Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION'OF OCCURRENCE:

No. 23 Containment Fan Coil Unit - Inoperable.

This reporE was initiated by Incident Report 82-058.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 100% - Unit Load 1130 MWe.

DESCRIPTION OF OCCURRENCE:

At 0305 hours0.00353 days <br />0.0847 hours <br />5.042989e-4 weeks <br />1.160525e-4 months <br />, July 2, 1982, during daily surveillance, the Control Room Operator observed that the service water flow to No. 23 Containment Fan Coil Unit (CFCU) was less than the 2500 GPM required in the low sp'eed mode-of operation.

The fan coil group containing the unit was declared inoperable, and Technical Specification Action Statement 3.6.2.3.a was entered.

The containment spray systems were operable throughout the occurrence.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The low service water flow was caused by American oysters (Crassostrea virginica) plugging Back Pressure Control Valve 22SW57. It appears that earlier this year, oyster scat were drawn into the Service Water System and were able to pass -

through the strainers. The scat attached themselves in colonies to piping walls, in low flow portions of the system, where they grew in. size. The oysters are released from their points of attachment duringtsystem operational events (pump '

shifts, lineup changes, etc.) and periodic chlorination. Larger.

oysters cannot pass through the valve tube bundle face thereby restricting ~ flow.

ANALYSIS OF OCCURRENCE:

The CFCU's operate in conjun'ction with the containment spray systemt 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 insure offsite radiation. dose is maintained within the limits of 10CFR100. This occurrence therefore sconstituted operation in a degraded mode permitted by a limiting condition for operation and is. reportable in accordance with Technical Specification

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LER 82-058/03L . 4 ANALYSIS OF OCCURRENCE: -(continued)

Because redundant cooling capability was provided by the containment spray systems, no risk to the health or safety of the public was involved.

Action Statement 3.6.2.3.a requires:

With one group of containment cooling fans inoperable, restore the inoperable group of cooling fans to operable status within the next 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:

Due to the high differential pressure indicated across Valve 22SW57 and the low service water flow (approximately 500 GPM),

the valve was immediately disassembled. Oyster shells were found plugging the tube bundle, and were removed. Reassembly and surveillance testing were satisfactorily completed, the CFCU was declared operable, and Action Statement 3.6.2.3.a was terminated at 1325 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.041625e-4 months <br />, July 3, 1982.

Development of a chlorination program to fully eliminate the oysters from the Service Water System and to prevent recurrence of colony development is in progress. Limits in the Environmental Technical Specifications presently restrict chlorination to concentrations and durations which are ineffective. A commitment to submit a Supplemental Report upon resolution of the problem was made in LER 82-041.

FAILURE DATA:

Not Applicable.

Prepared By R. Frahm , -

db ~~

V General Manager -

Salem Operations SORC Meeting No. 82-69

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