05000249/LER-1980-037, Forwards LER 80-037/03L-0

Forwards LER 80-037/03L-0

ML17193A561
Person / Time
Site:	Dresden
Issue date:	11/17/1980
From:	Scott D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17193A562	List: 05000249/LER-1980-037, Forwards LER 80-037/03L-0 05000249/LER-1980-037-03, /03L-0:on 801020,during Normal Operation W/Dis 500-2 in Progress,Level Switch LIS 263-57B Was Found to Trip at Differential Pressure Less than Tech Specs.Caused by Instrument Drift.Instrument Readjusted
References
DJS-80-252, NUDOCS 8011250558
Download: ML17193A561 (2)

LER-1980-037, Forwards LER 80-037/03L-0

Event date:
Report date:
2491980037R00 - NRC Website

text

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BRANCH James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Connnission 799 Roosevelt Road Glen Ellyn, IL

• 60137 Reportable Occurrence Report ff80-37/03L-O; Docket #050-249 is being_,*

• submitted to your office in accordance with Dresden Nuclear Power*station Technical Specification 6.6.B*.2. (a), reactor protection system or engineered safety feature instrument settings whichare found to be less conservative than those. established by the technic~l specifications but which do not prevent the fulfillment of.the.functional requirements -of affected systems.

DJS/nh Enclosure f)mAAlkJd rAt-D. J:.efcotti Station Superintendent Dresden Nuclear Pow.er Station cc/.Director of Inspection.& Enforcement Director. of Management Infonnation &* Program Control*

U.S. NRC, Document Management Branch File/NRC

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES @.

I During normal operation, with DIS 500-2 in progress, level switch LIS 263-57B was found to trip at a differential pressure. which corresponded to a level set point of I

IIIIJ I less than the Tech. Spec. limit (Table 3.2.1) of 84 inches.

This was of minimal. safety!

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There. was no effect on public health or safety previous. occ~rrences. RO. 76-57, Docket 1-I o *1 7 I t__2E-23 7; 77-51., 80-_23, and 80-24, Docket 050-249*

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'.I 1 Io I rrm j* The cause' of this event was instrument drift.

The. in~trument was immediately readjus:- I ted and subsequent testing was satisfactor:i:ly performed.

DIS 500-2 will continue to JIJTJ I be. done monthly.

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