05000373/LER-1982-064, Forwards LER 82-064/03L-0.Detailed Event Analysis Encl

Forwards LER 82-064/03L-0.Detailed Event Analysis Encl

ML20063D986
Person / Time
Site:	LaSalle
Issue date:	08/06/1982
From:	Holyoak R COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20063D988	List: 05000373/LER-1982-064, Forwards LER 82-064/03L-0.Detailed Event Analysis Encl 05000373/LER-1982-064-03, /03L-0:on 820721,position Indication Lights for Automatic Depressurization Sys Valve 1B21-F0134 Failed to Operate,Indicating Valve Open When Observed Closed.Caused by Improper Interaction Between Magnets & Reed Switches
References
NUDOCS 8208300101
Download: ML20063D986 (2)

LER-1982-064, Forwards LER 82-064/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3731982064R00 - NRC Website

text

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/)/11B Commonwealth Edison

- c LaSalla County Nuclsar Station L RuralRoute #1, Box 220 c_

. Marseilles, Illinois 61341 Telephone 815/357 6761 August 6, 1982 James G. Keppler Regional Administrator Directorate of Regulatory Operations, Region lil U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Sir:

Reportable Occurrence Report #82-064/03L-0 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.

i k R. H. Hol ak Superintendent LaSalle County Station RHH/GW/dJp Enclosure cc:

Director of Inspection & Enforcement Director of Hanagement information & Program Control l

U. S. NRC Document Management Branch inpo-Records Center File /NRC 8200300101 820806 PDR ADOCK 05000373 2 3 $82 i

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LER NUMBF.R:

82-064/03L-0 11.

LASALLE COUNTY STATION: Unit 1 3

til. DOCKET NUMBER:

050-373 IV. -EVENT DESCRIPTION

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Technical Specification 3.3 7 5 and 3.4.2. requires, the Safety / Relief Valve position indication to be operable. On ' July l21,' 1982 while performing LOS-MS-R2, Main Steam Safety /Relle f ;Vd,1ve Manu' l - Cycling a

Test, the position indication lights for ADS Val ~ve 1821-F0130 failed to operate properly. The position indication lights showed' the valve to be full open af ter the valve had been opened then closed.

The valve-was verified, locally at the valve, to be fully closed.

This was the first time that these valves had-been functionally tested.

V.

PROBABLE CONSEQUENCES OF THE OCCURRENCE e,-

At the time of this event, l.aSalle Unit 1 was i,n Condition 2 undergoing,

initial heatup phase testing.

Observers were stationed 'in 'the drywell to monitor safety / relief valve operation.

in addition to the observers, the NSSS Alarm typer printouts for the S/RV position were functioning prope'rly and indicated-the valve was closed.

Safe op'eration of the t-Unit was maintained at all times.

VI.

CAUSE

The cause of this occurrence. was improper interaction between 'the magnet and the wired set of reed switches in the position Indication assembly for this valve.

The position incication assembly was manufactured by Crosby Valve and Gage Company.

<s Vll. CORRECTIVE ACTION 1

A work request, L17469, was ini tiated to correct _ the problem of the incorrect position' indication.

Under th}s work request, the posi tion indication was repaired by changing all electrical' connections to the spare set of reed swi tches. This SRV was' cycled, satisfactorily, and declared operable at 0300 on July 23, 1982.

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Prepared by:

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