05000373/LER-1982-057, Forwards LER 82-057/03L-0.Detailed Event Analysis Encl

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Forwards LER 82-057/03L-0.Detailed Event Analysis Encl
ML20062E800
Person / Time
Site: LaSalle Constellation icon.png
Issue date: 08/05/1982
From: Holyoak R
COMMONWEALTH EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20062E803 List:
References
NUDOCS 8208100330
Download: ML20062E800 (2)


LER-2082-057, Forwards LER 82-057/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
3732082057R00 - NRC Website

text

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. Commonwealth Edison b .; ) LISille County Nuclear Station m

Rural Routs *1. Box 220

. Marseities, lllinois 61341 Telephone 815/357-6761 August 5, 1982 Jones G. Keppler F..:glonal Administrator Directorate of Regulatory Operations, Region ill U. S. Nuclear Regulatory Commission 799 RooseveIt Road Glen Ellyn, IL 60137

Dear Sir:

Reportable Occurrence Report #82-057/03L-G Docket #050-373 is being submitted to your office in accordance with LaSalle County Nuclear Power Station Technical Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation.

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TD R. H. Hol k 4

{ 5ur - nd t m alle Co Station P4H/GW/djp Enclosure cc: Director of Inspection & Enforcement

'\ Director of Management Information & Program Control U. S. NRC Document Management Branch inpo-Records Center File /NRC 8208100330 820805 r~

PDR ADOCK 05000373 6 $U-S PDR  %

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1. LER NUMBER: 82-057/03L-0 l II. LASALLE COUNTY STATION: Unit 1 til. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:

Technical Specification 3 3.7.10 requires that a minimum of one radioactive liquid effluent monitoring instrumentation channel shall be operable at all times with the alarm / trip setpoint in accordance with the Offsite Dose Calculation Manual (00CM). With less than the minimum number of radioactive 11guld effluent monitoring instrumentation channels operable, effluent re-leases may continue for up to thirty (30) days provided that, at least once per eight (8) hours, grab samples are collected and analyzed.

On July 8,1982, "A" RHR Service Water Process Radiation Monitor pump was found to be cycling on and off.. The pump is supposed to run continuously.

A work request was writt'en to investigate and correct the problem.

V. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

At the time of the occurrence, LaSalle Station Unit I was in the Cold Shutdown Mode (Mode 4), in accordance with Technical Speci.ftcation 3.3.710, RHR Service Water grab samples were taken and analyzed every eight (8) hours. Operation of the Service Water System was not suspended during this period. Safe operation of the facility was maintained at all times.

VI. CAUSE On June 30, 1982, due to a leaking pump seal, Hechanical Maintenance installed a new pump and motor assembly. Two days later, the pump motor was wired by the Electrical Maintenance Department. The motor was a single phase, 60 HZ, dual voltage (115/230V). GE Model 5KC38LG676X. At the time of the wiring, the motor could not be checked for proper operation due to Out of Service #1-1225-82. On July 2,1982 the Out of Service was cleared and the "A" RHR Service Water Process Radiation Monitor was put into operation.

On July 8,1982 the rotor was discovered tripping from thermal overload.

The Instrument Maintenance Department looked into the problem and dis-covered that the motor was in the 230, volt configuration instead of the 110 volt configuration. This caused the motor to overheat and trip.

VIl. CORRECTIVE ACTION A work request was written to correct the problem. Under this work request, the motor was internally wired for 110 volt operation. On July 10, 1982 the "A" RHR Service Water Process Radiation Monitor Pump was declared operable.

An AIR (1-82-412) has been written for the Electrical Maintenance Depart-

- ment to give training on verification of proper motor wiring.

Prepared by: J. Conard

.