ML20010H751

LER 81-022/03L-0:on 810902,vessel low-low Water Level Isolation Switch Had Setpoint of 116.8 Inches,Exceeding Tech Spec Limit.Caused by Instrument Setpoint Drift.Setpoint Adjusted

ML20010H751
Person / Time
Site:	Dresden
Issue date:	09/18/1981
From:	Schroeder B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010H744	List: ML20010H743 ML20010H751
References
LER-81-022-03L-01, LER-81-22-3L-1, NUDOCS 8109290259
Download: ML20010H751 (2)

Text

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61 CoCKET NUMgER 68 69 EV ENT OATE 74 75 PEPCRT OATE 80 EVENT DESCRIPTION ANO PROSA8LE CONSEQUENCES h t o t a i l While performing routine surveillance DIS 500-2, vessel low low wacer level isolation l g[ suitch LIS 3-263-57B found to have a setpoint of 116.8 inches of water which exceeds l gog.; l Tech. Spec. limit (Table 3.2.1) of 114.5 inches of aater. Safety implications minimal l Lo_Is I because redundant level switches were operable to provide ene necessary isolation l go,s;l function. There was no effect on public health or safety. Previous occurrence: (

g g j Docket 50-249/80-16, 80-023/03L-0, 80-024/03L-0. [

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CAUSE DESCRIPTION AND CCR8FCTIVE ACTIONS 27 i i l o l. l Cause of event was attributable to instrument setpoint drif t. l . .

g l Instrument inspected and nothing abnormal found. Setpoint-was immediatelv i

g l adjusted to 112 inches water column and repeatability verified. Reactor 1 vel l It Isi i switches will continue to be tested monthlv. l l .litall T a e I

so ST  % PCWER oTHER 3TATUS 01 ov Y DISCOVERY DESCRIPTION .

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- aMa, DEVIATION REPORT Dvt t<o.

Commonwealth Ed.ison STA UNIT YEAR N O.

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81- 48

'#" "IINksN1DNM'ater Level Isolation LIS 3-263-57B Tripped Above OC ED Tech. Spec. Limits 04TE Tius SYSTEM AFFECTED 260 PLANT CONDITIONT. TESTING Vessel Instrumentatiots Refuel

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CE5CRIPTION OF EVENT Found Rx vessel low low water level isolation switch to trip at 116.8" W.C. dp increasing, which ic 2.3 inches greater than Tech. Spec. Limit of 114.5 inches of water maximum.

DESCRIPTION OF CAUSE F ind no problem with instrument during investigation via DIP 010-9.

OTHER APPLICABLE INFORMATION Readjusted switch to trip at ll2.4",W.C. dp increasing and verified repeatability. Other switch in yarway unit for Rx scram operi.ted satisfactorily.

EG UIPNENTI LYES CR NO. WR NO.

FAILURE Alan R. "apatocky -9/2/81 (X_[ NO N/A N/A RESPONSIBLE SUPERVISOR OATE PART 2 l OPERATING ENGINEERS CCMMENTS The switch was immediately reset, per Tech. Spec setpoints and reneatability verified.

TYPE OF CEVIATION SAFETY-EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION QCCURRENCE REPORTING WE ISSUED * +

14 DAY

' ' YES X YES X 30 DAY NOTIFICATICN l __ NO NO 6.6.B.2.a REPORTABLE CCCURRENCE ACTICN ITEM NO. PROMPT ON-SITE NOTI FICATION NUMBER R. M. Ragan 9/4/81 1030

t%? 81-12/03L-0 TlTLE DATE TlME TlTLE DATE TIME 24-HOUR NRC NOTIFICATION PROMPT OFF-SITE NOTI FICATION N/A F. A. Palmer 9/8/81 0836 TPH

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REG'ON I1l DATE TIME TI TL E .'DATE TIME TGM N/A REGION IIi & COL CATE TIME TITLE DATE TIME RESPONSI BLE CCMP ANY OFFI CER I N FO RMED O F 10 CFR 21 CONDITIONS AND THEIR AEAGAT TO N AC

• TITLE DATE TIMt REV1 EW AND CCMPLETED Michael Wright 9/4/81 CEP A BY STATION REVIEW }, ,, , ,

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• RESOLUTION APPROVED AND -

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AUTHORIZED FOR DISTRIBUTION A1 N SUPERINTENDENT / DATE es.s 7 ro-77 tronu is-sa.t ef "!

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