05000311/LER-1982-136, Forwards LER 82-136/01T-0.Detailed Event Analysis Encl

Forwards LER 82-136/01T-0.Detailed Event Analysis Encl

ML20070D898
Person / Time
Site:	Salem
Issue date:	12/01/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20070D902	List: 05000311/LER-1982-136, Forwards LER 82-136/01T-0.Detailed Event Analysis Encl
References
NUDOCS 8212160399
Download: ML20070D898 (3)

LER-2082-136, Forwards LER 82-136/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
3112082136R00 - NRC Website

text

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O PSIsG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station December 1, 1982 Mr. R. C. Ilaynes Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Ilaynes :

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-136/0lT 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 82-136/0lT. This report is required within fourteen (14) days of the occurrence.

Sincerely yours, f', c "O H. J. Midura General Manager -

Salem Operations RF:ks CC: Distribution 8212160399 821201 PDR ADOCK 05000311 S PDR The Energy People v, v w, ,xm n e1

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Report Number: 82-136/0lT Report Date: 12-01-82 Occurrence Date: 11-24-82 Facility: Salem Generating Station Unit 2 Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURREEEE:

Containment Service Water Leak - No. 23 Containment Fan Coil Unit.

This report was initiated by Incident Report 82-429.

CONDITIONS PRIOR TO OCCUEEENCE:

Mode 1 - RX Power 82 % - Unit Load 910 MWe, DESCRIPTIO!LQF OCCUBHERCE:

At 0525 hours0.00608 days <br />0.146 hours <br />8.680556e-4 weeks <br />1.997625e-4 months <br />, November 24, 1982, during routine surveillance, an operator discovered a small service water leak of approximately 0.5GPM on a cooling coil of No. 23 Containment Fan Coil Unit (CFCU). The leak was isolated and prompt notification of the NRC was made by telephone at 0530 hours0.00613 days <br />0.147 hours <br />8.763227e-4 weeks <br />2.01665e-4 months <br />. The unit was declared inoperable and Technical Specification Action Statement 3.6.2.3a was entered retroactive to the time of discovery. Both containment spray systems were operable throughout the occurrence.

APPARENT CAUSE OF OCCURRENCE:

Investigation of the problem revealed that the leakage was due to erosion of the cooling coil. The coils are fabricated of copper nickel alloy which is susceptible to erosion by the silt laden service water. Similar failures of other CPCU'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 insures that the release of radioactive material in the event of accident conditions will be restricted such that site boundary radiation doses will be within the limits of 10CPR100.

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 the possibility of the release of radioactivity through the service water discharge. The occurrence therefore constituted an abnormal degradation of the containment and is reportable in accordance with Technical Specification 6.9.1.8c.

e .

LER 82-136/01T ANALYSIS OF OCCURRENCE: (cont'd)

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 this equipment is necessary to ensure offsite radiation dose is maintained within the limits of 10CFR100. The loss of redundancy in safety equipment involved in the occurrence constitutes operation in a degraded mode permitted by a limiting condition for operation in accordance with Technical Specification 6.9.1.9b.

Action Statement 3.6.2.3a requires:

With one group of the above required cooling fans 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 />.

Because the leak was immediately isolated, containment integrity was maintained. Containment cooling capability was provided by the redundant CFCU's and containment spray systems. The occurrence therefore involved no risk to the health and safety of the public.

CORRECTIVE ACTION:

The leaking coil was repaired by blanking off the service water piping to the coil. No. 23 CFCU was returned to service and was satisfactorily tested. The unit was declared operable at 1625 hours0.0188 days <br />0.451 hours <br />0.00269 weeks <br />6.183125e-4 months <br />, November 24, 1982, and Action Statement 3.6.2.3a was terminated.

Design Change Request 2EC-0505 has been issued to replace 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 82-070/01T.

FAILURE DATA:

A number of containment service water leaks due to similar failures of CFCU cooling coils have occurred since January 1, 1982.

Wectinghouse Electric Corp.

Containment Fan Coil Unit U-Tube Cooling Coil Prepared By R. Prahm /*

Gdnerd1 Manager -

Salem Operations SORC Meeting No.82-107