05000249/LER-1981-034, Fowards LER 81-034/03L-0.Detailed Event Analysis Encl

Fowards LER 81-034/03L-0.Detailed Event Analysis Encl

ML20033B436
Person / Time
Site:	Dresden
Issue date:	11/23/1981
From:	Scott D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20033B437	List: 05000249/LER-1981-034, Fowards LER 81-034/03L-0.Detailed Event Analysis Encl 05000249/LER-1981-034-03, /03L-0:on 811026,source Range Monitor Channels 21 & 22 Found to Trip at Level Exceeding Tech Spec Limit.Caused by Drift of High Alarm Setpoint Potentiometer.Setpoints Adjusted
References
81-924, NUDOCS 8112010410
Download: ML20033B436 (2)

LER-1981-034, Fowards LER 81-034/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2491981034R00 - NRC Website

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Commonwealth Edison

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Dresden Nuclear Power Station R.R. #1

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Morris, Illinois 60450

.l Telephone 815/942-2920

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November 23, 1981

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S DJS Ltr. #81-924 g

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0 1981 e 10; 3. :<

James G. Keppler, Regional Director

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MOW p'iais Q Directorate of Regulatory Operations - Region 111 U.S. Nuclear Regulatory Commission u.5 M55 f

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Reportable Occurrence Report #81-34/03L-0, Docket #050-249 is being

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submitted to your office in accordance with Dresden Nuclear Power Station t

Technical Specifica~. ion 6.6.B.2. (a), reactor protection system or engincered safety feature instrument settings which are found to be

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less conservative than those established by the technical specifications s, u%.i, '

but which do not prevent the fulfillment of the functional requirements

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of affected systems.

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. Scott

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Station Superintendent Dresden Nuclear Power Station p ;..

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-'4..A Enclosure

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cc: Director of Inspection & Enforcement airector of Management Information & Program Control

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DEVIATION REPORT s

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Commonwealth Edison STA UNIT YEAR NO.

D 3 7 0 PART 11 TI TLE OF DEV1 ATION OCCU RRED Failure of Channel 21 and 22 SRM's to Trip at Required Setpoint in 'j A1 11 g,n g

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SYSTEM AFFECTED 700

PLANT CONDITIONS

TESTINGC Neutron Monitorine MODE Run pwpfvwy) 1644

, LOAD (MWE) 516 YES NO

DESCRIPTION OF EVENT

While performing routine surveillance DIS 700-3 (SRM Rod Block Calibration Check), SRM channels 21 and 22 were found tripping above limits.

DESCRIPTION OF CAUSE Unknown OTHER APPLICABLE INFORMAT}0N The trip ooints were readjusted per calibration procedure.

EQUIPMENT YES DR NO.

WR NO.

Richard A. Thomas 10-27-81 FAILURE NO N/A N/A RESPON_5lBLE SUPERvlSOR DATE PART 2 l OPERATING ENGINEERS COMMENTS The trip points were readjusted and repeatability verified.

SAFETY-TYPE OF CEVIATION EVENT OF POTENTI AL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPGRTI NG WR ISSUED 10CFR21 YES X YES 14 DAY X

30 DAY NOTIFICATION NO NO 6.A.B.2.a REPORTABLE OCCURRENCE ACTION ITEM NO.

PROMPT ON-SI TE NOTIFICATION NWBER l

R. M. Ragan 10-27-81 1500 g 81-34/03L-0 TITLE DATE TIME

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TITLE DATE TIME l

24-HOUR NRC NOTI FICATION PROMPT OFF-SI TE NOTI FICAT;0N 1

l TPH N/A F. A. Palmer 10-28-81 12 43 l

REGION IIi DATE TIME TITLE DATE TIME TGM N/A l

REGION ilI & COL CATE TIME TITLE DATE TIME RESPONSI BLE COMP ANY OFFI CER INFORMED OF IOCFR21 j

comDfTf0NS AND THE!R QEDORT TO NPC T

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Michael h REV1 EW AND COMPLETED -

10-27-31 j

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CEP BY STATION REVI EW DATE

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RESOLUTION APPROVED AND 6I44 N

AUTHORIZED FOR DISTRIBUTION S TIp SUPERINTENDENT CATE j

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