ML20024B072

Updated LER 83-012/03X-1:on 830210,w/reactor in Cold Shutdown,Setpoints for Switches 1E31-N612A/B Found Above Tech Spec Limits.Cause Unknown.Switches calibr.W/830616 Ltr

ML20024B072
Person / Time
Site:	LaSalle
Issue date:	06/16/1983
From:	Diederich G, Wittenburg K COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-83-012-03X-01, LER-83-12-3X-1, NUDOCS 8307050070
Download: ML20024B072 (3)

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. :! l On 2/10/83 at 0730 hrs. , during LIS-RI-03', LD temp. swi tch calibration , wi th 'the Reactor; In Cold Shutdown , setpoints for switches 1E31-N612A/B were above the LCO of 2060F per  ;

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1. LER NUMBER: 83-012/03X-1

11. LASALLE COUNTY STATION: Unit 1 til. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:

On February 10,1983 at 0730 hours0.00845 days <br />0.203 hours <br />0.00121 weeks <br />2.77765e-4 months <br />, during the performance of LIS-RI-03, RCIC leak detection temperature switch calibration, with the reactor in Cold shutdown, it was observed that the setpoints for0 temperature switches 1E31-N612A and 1E31-N612B were at 2080F. This is 2 F above the Ilmiting condition of operation.setpoint of 206 F, as stated in Technical Specifi-cation Table 3.3.2-2 V. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The temperature switches were still functioning but would have alarmed two degrees higher than the allowed temperature setpoint. In addition, a redundant temperature recorder,1E31-R608, would have alarmed at the correct setpoint. This recorder showed that no high temperatures were seen in the area covered by the temperature switches and therefore the Unit was main-tained in a safe condition at all times.

VI. CAUSE:

The exact cause of the temperature drif t has not been determined. Switches 1E31-N612A and 1E31-N612B were identified in LER-83-005/01T-0 as being po-tentially defective by reason that the modules were loading down the thermo-couple beyond-the-allowable range.

Vll. CORRECTIVE ACTION:"

Temperature switches 1E31-N612A and 1E31-N612B were calibrated immediately to the correct setpoint of 195 F. The Vendor, Panalarm Division of the Riley Company, as well as General Electric, have investigated the related problem identified in LER 83-005/01T-0. AIR 1-83-51 was wri tten' to . track the resul ts of the investigation. The long term corrective action to be taken is a change to the calibration procedures which are being tracked by AIR 1-83-95. No hardware changes are presently anticipated.

Prepared by Kermit C. Wittenburg i

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. Commonwealth Edison o LESalla County Nuclear Station

- .4 RuralRoute #1 Box 220 V Marseilles, Illinois 61341 Telephone 815/357-6761 June 16, 1983 )

l James G. Kepple r Regional Administrator Region til U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Si r:

Reportable Occurrence Report #83-012/03x-1 Docket #050-373 is being submitted to your of fice to supersede previously submitted Reportable Occurrence Report

1. 83-012/03L-0, in accordance with NUREG-0161, " Instructions for Preparation of Data Ent ry Sheets for Licensee Event Report (LER) File"; Gene ral Instruction No. 3.

G J. Diederich Supe rin tenden t LaSalle County Station GJD/GW/1 rm Enclosure cc: Director of inspection & Enforcement Di rector of Management Information & Program Con trol U.S. NRC Document Managemen t Branch inpo-Records Cente r File /NRC p .

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