ML20064E432

/03L-0 on 781013:channel N41 Rate Trip Set at 11.8% in 2.2 Seconds Rather than Limit of 5.5% in 2 Seconds. Caused by Inadvertent Readjustment or Improper Calibr of the Setpoint

ML20064E432
Person / Time
Site:	Beaver Valley
Issue date:	11/13/1978
From:	Werling J DUQUESNE LIGHT CO.
To:
Shared Package
ML20064E430	List: ML20064E427 ML20064E432
References
LER-78-055-03L, LER-78-55-3L, NUDOCS 7811170178
Download: ML20064E432 (1)

Text

' U. S. NUCLEAR REGULATORY COMMISSION N C FCM .l46 '

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• LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIREO IRFORMATION)

CONTROL BLOCx: l i

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" "7 l L j@l 0 l 5 l 0 l 0 l 0 l 3 l 3 l 4 @l 69 l l 0 l 1 l 3l 7 l 8 l@l 1lREPORTDATE 74 75 11 1l 3l 7l 8l@ to 7 8 60 64 OOCKET NUvaER t4 EVENT OATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h g l During performance of the quarterly surveillance test on the reactor excore l lol3g ; instrumentation, Channel N41 rate trip was discovered set at 11.8 percent in l m l 2.2 seconds versus the limit of 5.5 percent in 2 seconds. The other three channels l l 0 I s i I were checked and found to be correct. I

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• COMPONENT CODE SL8 COO'E $U E OE CODE SUS E 7

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li 10 l l The cause of the event is believed to be inadvertent readjustment or improper l l i l i l I calibration of the setpoint. A review of the calibration historv of the se rr>o in t l The setpoint was

, W l indicates the change was not the result of ir.strument drift. l

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Q ] readjusted and verified. l i

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% POWER OTHER STATUS 035 O RY DISCOVERY DESCRIPTION i 5 l Gl@ l 0 l 0 l 0l@l N/A l lBl@l Surveillance test  !

ACTivt TY CO TENT RELEASEO OF RELE ASE AVOUNT OF ACTIVITY LOCATION OF RELEASE ,

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7 8 9 68 69 EG.5

• UE PHONE:

412-643-1258 NAME OF PP.EPARER