05000366/LER-1982-136-03, /03L-0:on 821229,during Surveillance Testing,Power Monitoring Relay for Reactor Protection Sys Alternate Supply Found to Actuate at 132.2 Volts.Caused by Overvoltage Relay Out of Calibr Due to Instrument Drift.Relay Recalibr

/03L-0:on 821229,during Surveillance Testing,Power Monitoring Relay for Reactor Protection Sys Alternate Supply Found to Actuate at 132.2 Volts.Caused by Overvoltage Relay Out of Calibr Due to Instrument Drift.Relay Recalibr

ML20028G104
Person / Time
Site:	Hatch
Issue date:	01/25/1983
From:	Tipps S GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028G100	List: 05000366/LER-1982-136, Forwards LER 82-136/03L-0 05000366/LER-1982-136-03, /03L-0:on 821229,during Surveillance Testing,Power Monitoring Relay for Reactor Protection Sys Alternate Supply Found to Actuate at 132.2 Volts.Caused by Overvoltage Relay Out of Calibr Due to Instrument Drift.Relay Recalibr
References
LER-82-136-03L, LER-82-136-3L, NUDOCS 8302070400
Download: ML20028G104 (1)

LER-1982-136, /03L-0:on 821229,during Surveillance Testing,Power Monitoring Relay for Reactor Protection Sys Alternate Supply Found to Actuate at 132.2 Volts.Caused by Overvoltage Relay Out of Calibr Due to Instrument Drift.Relay Recalibr

Event date:
Report date:
3661982136R03 - NRC Website

text

NRC FCRM 366 U. S. NUCLEAR REGUL ATCRY COMMISSION Q77).

' LICENSEE EVENT REPORT

' oNTROL etOCK:

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l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 68 CON'T lolil S$ "C[ Ql 01 5l 0l 01 0l 3l 6 l 6 l@l ll 2l 2 l 9l B l 2 l@l 0 l 1 l 2 l 5 l 8 l 3 l@

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60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PRO 9ABLE CONSEQUENCES h the "RPS MG SET UNDERVOLTAGE, OVERVOLTAGE AND UNDER-l l o [ 2 l l While performing O 3 l FREQUENCY RELAYS" procedure, the power monitoring relay for RPS alter-l l O [4 ] l nate supply was found to actuate at 132.2 volts. Tech. Specs. section l

l O I s l l 4. 8. 2. 7.b.1 requires that the relay actuate at less than or eaual to l

10161 1132 volts.

The electrical power monitorina system for RPS normal supplvl l O l 71 I remained operable. The health and safety of the public were not l

l 0 lR t l af fected by this non-repetitive event.

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33 34 35 36 31 40 48 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l 0 l l This event was attributed to the overvoltage relay being out of calibra-l l tion due to setpoint drift.

The relay was recalibrated satisfactorily I

i i l as per the "RPS MG SET UNDERVOLTAGE, OVERVOLTAGE AND UNDERFREQUENCY l

l l, l 3 l l RELAYS" procedure, thus returning the power monitoring system for RPS l

l alt. supply to normal operable status.

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