05000311/LER-1982-117, Forwards LER 82-117/03L-0.Detailed Event Analysis Encl

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Forwards LER 82-117/03L-0.Detailed Event Analysis Encl
ML20066A183
Person / Time
Site: Salem PSEG icon.png
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
ML20066A185 List:
References
NUDOCS 8211050112
Download: ML20066A183 (3)


LER-2082-117, Forwards LER 82-117/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
3112082117R00 - NRC Website

text

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'O PSIEG Public Service Efectric 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-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-ll7/03L 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-ll7/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

[ W[o d'~

l H. J. Midura General Manager -

Salem Operations l

RF:ks CC: Distribution 8211050112 821020 PDR ADOCK 05000311 S PDR The Energy People g6 95 2189 (20M) 1181 l

e o Report Number: 82-ll7/03L' Report Date: 10-20-81 Occurrence Date: 09-29-82 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 report was initiated by Incident Report 82-314. ,

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 81% - Unit Load 900 MWe.

s DESCRIPTION OF OCCURRENCE:

At 0056 hours6.481481e-4 days <br />0.0156 hours <br />9.259259e-5 weeks <br />2.1308e-5 months <br />, September 29, 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 speed mode c# 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 i 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 during system 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 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 j is necessary to insure offsite radiation dose is maintained within I the limits of 10CFR100. This occurrence therefore constituted 1 operation in a degraded mode permitted by a limiting condition for l

operation and is reportable in accordance with Technical Specification 6.9.1.9.b.

r.

LER o

82-ll7/03L ANALYSIS OF OCCURRENCE: (continued)

Because redundac cooling capability was provided by the containment spray systems, ns 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 opera le 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, 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 termi-nated at 1219 hours0.0141 days <br />0.339 hours <br />0.00202 weeks <br />4.638295e-4 months <br />, September 30, 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. Design Change Request 2EC-1327 has been submitted to provide continuous chlorine moni-toring at the circulating water discharge. The modification will allow increased levels and durations of chlorination. 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 t b General / Manager -

Salem Operations SORC Meeting No.82-94B S