05000249/LER-1981-003, Forwards LER 81-003/03L-0

Forwards LER 81-003/03L-0

ML17193A738
Person / Time
Site:	Dresden
Issue date:	02/19/1981
From:	Scott D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17193A740	List: 05000249/LER-1981-003, Forwards LER 81-003/03L-0 05000249/LER-1981-003-03, /03L-0:on 810120,Model 288 Differential Pressure Indicating switch,3-1349B,tripped Above Tech Spec Limit. Caused by Instrument Drift.Switch Readjusted & Repeatability Verified
References
81-154, NUDOCS 8102250507
Download: ML17193A738 (2)

LER-1981-003, Forwards LER 81-003/03L-0

Event date:
Report date:
2491981003R00 - NRC Website

text

CommonwealtlAtison Dresden Nuclear PoJll'Statlon.

R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920

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DJS LTR /181-154 James G. Keppler, Regional Director February 19, 1981 Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory.Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report /181-03/03L-0, Docket /1050-249 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 which are found to be less conservative than those established by the technical speci-

. fications but which do not prevent the fulfillment of the functional requirements of affected sysi:ems.

DJS:lg Enclosure Station Superintendent Dresden Nuclear Power Station cc:

Director of Inspection & Enforcement Director of Management Information & Program Control U.S. NRC; Document Mgt~ Branch File/NRC

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• U; S. NUCLEAR REGULATORY COMMISSION-

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~~~~~~ L:.J© I o I 51 01 ol ol 21 41 91G)I o I 1 I 2 I o I 8 I 1 I© I o I 2 I 11 g I 81 11 G) 60 81 DOCKET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION Afl:ID PROBABLE CONSEQUENCES@

@ID I During normal operation while performing isolation condenser condensate line hi-flow:1

.[]lIJ calibration, dPIS 3-1349B tripped at 34 inches water coluinn differential pressure.

. r:2:TIJ Tech. Spec* Table 3. 2.1 limit is less. than or equal to 32 inches of water.

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Safety significance is minimal because redundant switch would have provided!

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isolation within Tech. Spec limit.

Similar events

76-26/031-0, 79-22/031-0, I..

C2lI] I 79-58/031-0, 80-11/031-0 and 80-25/031-0.

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CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

III§] I The cause for the setpoint drift is unknown.

44 47 The Barton Model 288 indicating switch I IJ:ITJ I was readjusted to trip at 29 inches water column differential pressure increasing

. I (J))J and repeatability was verified.

DIS 1300- 2 will continue to be performed monthly CIIIJ I to verify setpoint.

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46 80 44 PERSONNEL EXPOSURES

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Raymond Magrow NAME OF PREPARER~~---------~------