05000249/LER-1981-018-03, /03L-0:on 810619,LIS 263-72B Found Tripping Above Tech Spec Limit During Monthly Water Level ECCS Instrument Surveillance.Caused by Instrument Setpoint Drift.Setpoint Adjusted.Deviation Rept Encl

/03L-0:on 810619,LIS 263-72B Found Tripping Above Tech Spec Limit During Monthly Water Level ECCS Instrument Surveillance.Caused by Instrument Setpoint Drift.Setpoint Adjusted.Deviation Rept Encl

ML20009D633
Person / Time
Site:	Dresden
Issue date:	07/09/1981
From:	Schroeder B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009D626	List: 05000249/LER-1981-018, Forwards LER 81-018/03L-0 05000249/LER-1981-018-03, /03L-0:on 810619,LIS 263-72B Found Tripping Above Tech Spec Limit During Monthly Water Level ECCS Instrument Surveillance.Caused by Instrument Setpoint Drift.Setpoint Adjusted.Deviation Rept Encl
References
LER-81-018-03L-01, LER-81-18-3L-1, NUDOCS 8107240234
Download: ML20009D633 (2)

LER-1981-018, /03L-0:on 810619,LIS 263-72B Found Tripping Above Tech Spec Limit During Monthly Water Level ECCS Instrument Surveillance.Caused by Instrument Setpoint Drift.Setpoint Adjusted.Deviation Rept Encl

Event date:
Report date:
2491981018R03 - NRC Website

text

NRC PORM 364 U.S. NUCLEAR REGULATORY COMMISSION

• (77,)

LICENSEE EVENT REPORT CONTROL SLOCK: l l

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8 60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPCRT QATE 80 EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h lo tal l While performidg monthly Rx water level ECCS initiate instrument surveillance, LIS g ; 263-72B found to trip at 115.5 inches W.C., which exceeds Tech. Spec. Limit (Table 3.2.2) of 114.5 inches W.C.

Safety implications minimal because remaining three g

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, switches were operable and would have performed necessary ECCS initiation when re-y

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quired. There was no effect on public health or safety. Previous occurrences:

,9 Docket 50-249/80-16, 80-16, 80-023/03L-0, 80-024/03L-0.

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7 8 9 80 SYSTEM

CAUSE

CAUSE COMP.

VALVE CCCE CODE SU8COCE COMPCNENT CODE SUSCOCE SU8CCCE lo 19 l' lI lB l@ l El@ l E l@ lI lN lS lT [R lU [@ l Sj@ l Zl@

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVis10N LE R/RO EVENT YEAR R EPORT rio.

CODE TYPE NO.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l o l l Cause of event was

tributable to instrsmient setpoint drift.

Instrument inspected l

gl and nothing abnormal found.

Setpoint was immediately adjusted to 111.6 inches, and I

g.l repeatability verified. Rx level ECCS initiation level switches will continue to be l

l,i3l l cested monthly per DIS 500-3. '

l 11 14i l I

7 8 9 80 STA

'n POWER OTH ER STATUS Qi RY OlSCOVERY QESCRIPTION l E l@ l0 l9 l6l@l N/A l ] @l Surveillance Test l

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Ben Schroeder A15 942-2920 Ext. 548 l

o NAME CF PREPARER PHONO i

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/d DEVIATION REPORT DV R NO.

Commonwealth Edison STA UNIT YEAR N O.

3 81 - 37 D -12 Pnf Il Tl TLE OF DEV!ATION OCCU RRED Unit 3 Rx Lo-Lo Water Level ECCS Initiate Level Switch 3-263-72B 6/19/81 1415 Out of Calibration DATE TwE SYSTEM AFFECTED

PLANT CONDITIONS

TEti:NG j

Rx Protection Run 23M W

MODE p, g, y,7 3

, tagg gy,g) gg DESCRIPflON OF EVENT LIS 3-263-72B found to trip at 115.5" W. C. increasing. Tech. Spec. Limit is 84 (No) inches above actual fuel (114.5" W.C. max.)

DESCRIPTION OF CAUSE Michinical drift possible due to warm Rx. building temp.

HTHDt APPLICABLE INFORMATION Completed DIP 010-9 and reset switches to trip at 111.6" W.C. increasing and verified repeatabilit_y EQUIPMENT YES DR NO.

WR NO.

Alan R. Zapatocky 6/19/81 FAILU RE Q NO N/A N/A RESPONSIBLE SUPF# VISOR CATE PART 2 l OPERATING ENGINEERS COMMENTS Tht'leini switch was immediately reset & repeatability verified.

I SAT $TY-l TYPE OF CEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPCRTABLE ANNUAL RELATED REPORTABLE OC URRENCE PUBLIC INTEREST VIOLATION OCCU9RENCE REPORTING WR ISSUED 10CFR21 14 DAY YES YES NOTIFiCATICN I

l NO NO X 30 DAY 6.6.B.2.a f

REPORTABLE CCCURRENCE ACTION ITEM NO.

PROMPT ON-SITE NOTIFICATION NUMBER R. M. Ragan 6/22/81 0900 TiTL CATE TIME SQt 81-18/03L-0 TITLE CATE TIM 7 24-HOUR NRC NOTIFICATION PROMPT OFF-SITE NOTIFICATION TPH F. A. Palmer 6/22/81 10:25 REGION 111 DATE TIME TITLE DATE TIME TGM REGI Ofl ill & COL CATE TIME T I TL E DATE TIME RESPONSI BLE COMr ANY OFFI CER INFORMED OF 10 C F R 21 CONDITf0NS AND THElA DEPO AT TO N PC TITLE CATE i Mt Michael Wright 6/22/81 REV1 EW AND COMPLETED f

ACCEPTANCE BY STATION REVIEW

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AS RECUIRED DATE R$ SOLUTION APPROVEC AND

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