05000249/LER-1981-016-03, /03L-0:on 810618,water Level Instrument Surveillance Found LIS 263-57A Tripping Above Tech Spec Levels for Low Level Scram & Low Water Level Isolation. Caused by Instrument Setpoint Drift.Setpoint Adjusted

/03L-0:on 810618,water Level Instrument Surveillance Found LIS 263-57A Tripping Above Tech Spec Levels for Low Level Scram & Low Water Level Isolation. Caused by Instrument Setpoint Drift.Setpoint Adjusted

ML20009C638
Person / Time
Site:	Dresden
Issue date:	07/08/1981
From:	Schroeder B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009C634	List: 05000249/LER-1981-016, Forwards LER 81-016/03L-0 05000249/LER-1981-016-03, /03L-0:on 810618,water Level Instrument Surveillance Found LIS 263-57A Tripping Above Tech Spec Levels for Low Level Scram & Low Water Level Isolation. Caused by Instrument Setpoint Drift.Setpoint Adjusted
References
LER-81-016-03L-01, LER-81-16-3L-1, NUDOCS 8107210304
Download: ML20009C638 (2)

LER-1981-016, /03L-0:on 810618,water Level Instrument Surveillance Found LIS 263-57A Tripping Above Tech Spec Levels for Low Level Scram & Low Water Level Isolation. Caused by Instrument Setpoint Drift.Setpoint Adjusted

Event date:
Report date:
2491981016R03 - NRC Website

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. MRc PORM ase u.s. NUCLEAR REGULATORY COMMISSION

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60 61 oOCKET NUMSER 68 88 EVENT DATE 74 75 REPORT oATE 80 EVENT DESCRIPTION AND PRO 8A8LE CONSECUENCES h 10 l 2 l l While performini monthly Rx water level instrument surveillance. LIS 263-57A was found l ITTTl I to trip at 69.5 inches W.C. for low level scram and trip at 116 inches for low water l

io l4 l l level isolation which exceeds the Tech. Spec. Limits of 66.8 inches and 114.5 inches I,

I o I s l l respectively. Safety implications minimal because remaining three switches were all

.g lo l6 l l operable and would have performed as designed. There was no effect on public health or ;

o,7 ; [ safety.

Previous occurrences

50-249/80-023/03L-0 and 80-024/03L-0

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~9 11 12 13 18 19 20 SEoUENTIAL OCCURRENCE REPORT REVISION LER EVENT YEAR REPORT NO.

CODE TYPE No.

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_ 21 22 23 24 26 27 28 29 30 31 02 EN AC ON P T

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lN lg lY [g l N lg l G l 0 [ 8 l 0 lg_.

33 34 J

3 37 40 44 42 43 44 47 -

CAUSE DESCRIPTION AND CORRECTIVE ACTICNS h g i g o l l The cause of event attributed to instrument setpoint drif t.

Instrument was inspected

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g1 i,, l and nothing abnormal found. Low level scram setpoint was immediately adjusted to 63 '

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g inches and a repeated test showed the low low isolation to return to 112.7 inches. Rx g

low level ECCS switches will coticinue to be tested monthly per DIS 500-2.

g gl

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8 J 80 A

% POWER OTHERSTATUS l

Y OtScoVERY DESCRIPT10N ii is I trJ@ l 019 I 7 l@l N/A l

l3l@l Surveillance Tests

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AMouNTo, ACTIVITY @ l P.EuASEo eP RELEASE LOCATION oF RELEASE l1 l6 l l Zl @ l 2 l@l l

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8 9 to 11 44 46 80 PER$0NNEL EXPOSURES NUMSER TYPE CESCRIPTION i

l i 171 l0 10 l0 l@l Z l@l N/A l

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8 9 to 68 69 80 3 NAME @F PRFPARFR PHON F*

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DEVIATION REPORT 6

s DVR NO.

Commonwealth Edison STA UNIT YEAR N O.

o 3 35 PART 1l Tl TLE OF DEVi ATION OCCU RRED 6-18-81 1400 Unit 3 Reacter Vessel Low Level Half Scram and Low-Low Isolation o,75 7,yg SYSTEM AFFECTED 500

PLANT CONDITIONS

TESTING Rx Protection MODE PWR(MWT)

, LOAD (MWE)

DESCRIPTION OF EVENT

Whila conducting routine surveillance DIS #500-2 on LIS 3-263-57A, it was found that the low lcvel scram was set greater than 66.8" W.C. and the low-low water level was set greater than 114.5" W.C.

DESCRIPTION OF CAUSE Test eauipment checks out OK; cause unknown.

' T:iTHER APPLICABLE INFORMATION

~

Riest low water level half scram from 69.5" W.C. to 63" W.C. and a repeated test showed the low-low isolation to return to 112.7" W.C.

EQUIPMENT YES DR NO.

WR NO.

g ggg FAILURE Q NO N/A N/A RESPONSIBLE SUPERVISOR DATE PART 2 l OPERATING ENGINEERS COMMENTS The level switches were immediately recalibrated and repeatibility was verified.

SAFETY-TYPE OF DEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION CCCURRENCE REPURTING WR ISSUED 14 DAY VES X YES 10CFR21 X l 30 DAY NOTIF1 CATION 6.6.B.2.a NO NO y REPORTABLE CCCURRENCE ACTION ITEM NO.

PROMPT ON-SITE NOTIFICATION

" 0 R. M. Ragan 6/19/81 11:30 REX 81-16/03L-0 TlTLE DATE TIME

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TITLE CATE TIME 24-HOUR NRC NOTIFICATION PROMPT OFF-SITE NOTIFICATION TPH F. A. Palmer 6/19/81 12:40 REGION IIi DATE TIME TI TL E DATE TIME l

TGV REGION Ii1 & DOL CATE TIME TlTLE DATE TIME RESPONSI BLE COMP ANY O FFI CER I N FO RMED O F 10 CFR21 CONDITIONS AND THEI A CEPO Ar TO NPC TITLE DATE TIME i

REVI EW AND COMPLETED Michael Wright 6/19/81 CPERAT I NG ENGI Nt.tj / /

CATE I

AC BY STATION REVIEW jg gg j

DATE

1. ~N b

i RESOLUTION APPROVED AND W

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/

j AUTHORI ZED FOR DI STRI BUTION S T ig#4 SUPERINTENDENT

/ SATE l

86*Sf7' fC-77 (FORM tS-52**)

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