ML19208A045

LER 79-016/03L-0:on 790815,HPCI Turbine Area Temp Switch Found to Trip Above Tech Spec Limits.Caused by Setpoint Drift.Switch Replaced & Tested Satisfactorily

ML19208A045
Person / Time
Site:	Quad Cities
Issue date:	08/21/1979
From:	Vahrenwald J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19208A033	List: ML19208A032 ML19208A045
References
LER-79-016-03L-01, LER-79-16-3L-1, NUDOCS 7909120458
Download: ML19208A045 (1)

Text

NRC F,ORM 3g6 U. S. NUCLEAR REGULATORY CoMMisSloN (7-77 )

LICENSEE EVENT REPORT CONTROL 8 LOCK:

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REPCRT DATE DOCKET NUMB ER EVENT DESCRIPTION AND PRCB ABLE CONSEOUENCES h o 2 lWhile performing the HPCI Turbine Area High Temperature isolation Calibration, I o 3 l procedure QlS 27-1, temperature switch TS 2-2373A was found to trip at 201* F, exceedingi o 4 l Technical Specification Table 3.2-1 limit of 200 F. The sixteen HPCI turbine area high o 5 l temperature switches are arranged in groups of four, with each group connected in a one-l O c lout-of-two twice logic scheme. Therefore, the other switches would have initiated a l o 7 l group IV isolation at or below the 200 F LCO as designed. 1 o s l 1 7 8 3 80 SYSTE M CAUSE CAUSE COMP. VALVE CODE CODE SUSCOOE COMPGNENT CODE SUSCOCE SUSCODE O 9 l Sl F!h lE l@ l El@ l l l N I S l T l R l U lh l S lh l_Z_j h 7 8 9 10 11 12 13 18 19 20

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40 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The Cause of this occurrence m due to setpoint drift. The immediate corrective I g,lij j action was to recalibrate and successfully retest the switch. On August 17, 1979, I 7 l Switch TS 2-2373A was replaced with a new switch, calibrated, and satisfactoriIv l

, 3 l tested, tripping at 183* F. This additional corrective action was taken due to a l i 4 l previous setpoirt drift of this switch on February 10, 1979 (R0 79-3/03L). l 7 8 9 80 ST  % POWER ' OTHER STATUS ISCO A DISCOVERY DESCRIPTION i s l El@ 0l 6l 4l@l NA l B [@l Routine Test / inspection l ACTIVITY CO TENT AELEASED OF PELE ASE AMCLNT OF ACTIVITY LOCATION CF RELEASE i s NA NA

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