05000366/LER-1981-084, Updated LER 81-084/03X-1:on 810903,N005 HPCI Steam Line Delta P Switch Found to Actuate at 204.5 Inches Water. Caused by Setpoint Drift.Barton Model 288A Switch Recalibr, Tested & Returned to Svc

Updated LER 81-084/03X-1:on 810903,N005 HPCI Steam Line Delta P Switch Found to Actuate at 204.5 Inches Water. Caused by Setpoint Drift.Barton Model 288A Switch Recalibr, Tested & Returned to Svc

ML20070A724
Person / Time
Site:	Hatch
Issue date:	11/30/1982
From:	Tipps S GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20070A700	List: 05000366/LER-1981-084, Forwards Updated LER 81-084/03X-1
References
LER-81-084-03X, LER-81-84-3X, NUDOCS 8212090335
Download: ML20070A724 (1)

LER-2081-084, Updated LER 81-084/03X-1:on 810903,N005 HPCI Steam Line Delta P Switch Found to Actuate at 204.5 Inches Water. Caused by Setpoint Drift.Barton Model 288A Switch Recalibr, Tested & Returned to Svc

Event date:
Report date:
3662081084R00 - NRC Website

text

NRC FORM 366 U. S. NUCLE A"1 CEIUL ATORY COMMISSION

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LICENSEE EVENT REPORT UPDATE REPORT - PREVIOUS

. -- " % REPORT DATE 10/1/81 CONTROL BLOCK: l 1

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 While increasino power from 238 MWt, durina the performance of the "HPCIl l 0 l 31 STEAM LINE DELTA P INSTRUMENT F.T. AND C." procedure, the N005 HPCI l o 4 Bteam Line dp Switch was found to actuate at 204.5" H20. Tech. Specs. l O s Table 3.3.2-2, item 5.1. requires actuation at </= 300 percent of rated l 0'6 l flow (a do of </= 196" H2O) . Redundant switch, N004, was in tolerance. l 10171 Wlant operation and the health and safety of the public were not affected 10181 by this repetitive event (as last reported on LER 50-366/1980-041). l 7 8 g 80 DE CODE SU8C E COMPONENT CODE SU8 CODE S E 7

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[Njg 43 lBl0l8l0lg 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O Rhe cause of this event has been attributed to setpoint drift. The l i i Iswitch, a Barton Model 288A, was recalibrated, successfully functionally l 1 2 l tested, and returned to service. An engineering study to find a means l g lof preventing or reducing the frequency of recurrence has recommended a l i 4 l Design Change. Recommended corrective measures are being evaluated. l 7 8 9 80 ST S  % POWER OTHE R ST ATUS ISCO RY DISCOVERY DESCRIPTION y (_Cj@ l 0 l 1 l 0 l@l NA l l B lgl Surveillance Testing l AETIVITY CO TENT LOCATION OF REMASE @

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