ML19345A992

LER 80-037/03L-0:on 801020,during Normal Operation W/Dis 500-2 in Progress,Level Switch LIS 263-57B Was Found to Trip at Differential Pressure Less than Tech Specs.Caused by Instrument Drift.Instrument Readjusted

ML19345A992
Person / Time
Site:	Dresden
Issue date:	11/17/1980
From:	Holland P COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17193A562	List: ML17193A561 ML19345A992
References
LER-80-037-03L-02, LER-80-37-3L-2, NUDOCS 8011250568
Download: ML19345A992 (1)

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• '"uc,"} 11@l 0151010 !01 21 419 @l 11012101310 @l 111 Il I 7 i 810 !@ 14 $0 4 69 11 :oCXET NUMgER 68 $9 EVENT 3 ATE 75 mEPORT CATE EVENT DESCRIPT1CN AND PRCBA8LE CONSEQUENCES h Io !2i l During normal operation, with DIS 500-2 in progress, level switch LIS 263-57B was l lo 6a1 i found to trip at a differential pressure which corresponded to a level set point of l l 0 6 .i i l 1ess than the Tech. Spec. limit (2able 3.2.1) of 84 inches. This was of minimal safety; Io is I significance since channel "A" and the redundant channel "B" instruments were operable.g j i.s;I There was no effect on public health or safety previous occurrences RO 76-57, Docket ,

, a i il l 50-237; 77-51, 80-23, and 80-24, Docket 050-249' l i)iail I 7 g 3 $0 SYSTEM CAUSE CAUSE CCMP. VA LV E CODE CCCE SUSCOOF OOMPCNENT COCE SUSCOCE SU SCOOE loist

? 3 Lt I al@ Lsj@ l e lg I ti Ni a a a u l@ iS i@ tz_j g 3 10 11 12 13 is is 20 SEQUENTIAL CCOURRENCE REPCRT EVISICN gg IVENT Y EA R R EPORT No. COCE TYPE No.

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g 12 3,I 22 l-1 L_01 317 I l/l 1013I I LI l-l 10 I

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4. 7 CAUSE CESCRIPTION AND CORRECTIVE ACTICNS i,Ia!l The cause of this event was instrument drif*._ The instrument was immediately readjus- )

i i i j j ted and subsequent testing was satisfactorily performed. DIS 500-2 will continue to l 4,,.,I be done monthly.  ;

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? sa sc 5A %PCwER OTHER STATUS 3 RV OISCOVERY CEScatPTION

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'O tt 44 45 30 aERSCNNEL EXPCSumES NUM8ER *YPE OESCRIPTICN L l i i r i 101010' @l 2 l@l N/A l 8EPSCNNEL\NJUR'ES NUVSER OESCRIPTtCN it i;i l o 1010 @l N/A i 5 3 't '2 30

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