05000366/LER-1980-003-03, /03L-0:on 800117,while Applying Equalizing Charge to 125/250-volt Dc Station Svc Batteries,Hpci Automatic Flow Control Power Inverter Tripped.Caused by Instrument Drift. Instrument Recalibr Satisfactorily

/03L-0:on 800117,while Applying Equalizing Charge to 125/250-volt Dc Station Svc Batteries,Hpci Automatic Flow Control Power Inverter Tripped.Caused by Instrument Drift. Instrument Recalibr Satisfactorily

ML19260D036
Person / Time
Site:	Hatch
Issue date:	01/31/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19260D034	List: 05000366/LER-1980-003, Forwards LER 80-003/03L-0 05000366/LER-1980-003-03, /03L-0:on 800117,while Applying Equalizing Charge to 125/250-volt Dc Station Svc Batteries,Hpci Automatic Flow Control Power Inverter Tripped.Caused by Instrument Drift. Instrument Recalibr Satisfactorily
References
LER-80-003-03L-01, LER-80-3-3L-1, NUDOCS 8002070279
Download: ML19260D036 (2)

LER-1980-003, /03L-0:on 800117,while Applying Equalizing Charge to 125/250-volt Dc Station Svc Batteries,Hpci Automatic Flow Control Power Inverter Tripped.Caused by Instrument Drift. Instrument Recalibr Satisfactorily

Event date:
Report date:
3661980003R03 - NRC Website

text

U.S. NUCLEAR REGULATORY C NRC FORM 366 (7 77)

LICENSEE EVENT REPORT CONTROL SLOCK: l l

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8 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h hhile applying an equalizin; charge to the 125/250 VDC Station Service Batteries, the l o 2 Due to the tripping of the l

! o 131 l HPCI Automatic Flow Control Power Inverter tripped.

of HPCI was made inoperative. The I inverter. 2E41-K603. the Automatic Flow Control Loop 0 4 1015 l l manual mode of HPCI was still operable.

RCIC, ADS, CS and LPCI were operable. There l l were no ef fects upon Dublic health and safety due to this event. This is a non-repet-j 0 6 1

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3J 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h fi o l The cause of the occurrence has been attributed to instrument drif t.

The high voit-l li li l l age trip setpoint of 2E41-K603 is 147 I.5 VDC.

The inverter tripped at 141 VDC.

TheI f7TF1 1 instrument was recalibrated satisfactorily and put on the annual LC0 list.

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NARRATIVE

REPORT Ceorgia Power Company Plant E. I. Hatch Baxley, Ca. 31513 Reportabic Occurrence Report No. 50-366/1980-03.

While the reactoe was at a steady state operation, an equalizing charge was 125/250 VDC Station Service Batteries. The HPCI Auto-being applied to the matic Flow Control Loop Power Inverter, 2E41-K603, circuit breaker tripped.

This caused the Automatic Flow Control Loop of HPCI to be inop due to the tripping of the inverter circuit breaker. The manual mode of HPCI was still operable and the RCIC System was also operable. Also the ADS, CSS, and LPCI Systems were operable.

The operation of the plant was not ef fected. There were no effects upon public health and safety due to this event. This is a non-repetitive event.

The cause of this occurrence has been attributed tosetpoint drift.

The set-of 2E41-K603 is 1471.5 VDC and the instrument actually tripped at point 2E41-K603, was recalibrated per HNP-2-5272, Topaz 141 VDC.

The instrument,

Static Inverter Calibration, and returned to service. The instrument, 2E41-K603, was put on the annual LCO calibration list.

Unit I and Unit II utilize this type of instrument, Topaz Static Inverter, Model N250-GWR-125-60-115, in their HPCI, LPCI and Feedwater Control Systees.

The instrument failure rate of these instruments do not indicate that there is any generic problems with these instruments.

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