05000266/LER-1980-007-01, /01T-0:on 800611,blue Instrument Bus 1Y02 Was de-energized,resulting in de-energization of 3 Containment Pressure Channels.Caused by Personnel Error.Power Restored & Instrumentation Returned to Normal

/01T-0:on 800611,blue Instrument Bus 1Y02 Was de-energized,resulting in de-energization of 3 Containment Pressure Channels.Caused by Personnel Error.Power Restored & Instrumentation Returned to Normal

ML19318C388
Person / Time
Site:	Point Beach
Issue date:	06/25/1980
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19318C377	List: 05000266/LER-1980-007, Forwards LER 80-007/01T-0 05000266/LER-1980-007-01, /01T-0:on 800611,blue Instrument Bus 1Y02 Was de-energized,resulting in de-energization of 3 Containment Pressure Channels.Caused by Personnel Error.Power Restored & Instrumentation Returned to Normal
References
LER-80-007-01T, LER-80-7-1T, NUDOCS 8007010420
Download: ML19318C388 (2)

LER-1980-007, /01T-0:on 800611,blue Instrument Bus 1Y02 Was de-energized,resulting in de-energization of 3 Containment Pressure Channels.Caused by Personnel Error.Power Restored & Instrumentation Returned to Normal

Event date:
Report date:
2661980007R01 - NRC Website

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LICENSEE EVENT REPORT y

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8-60 61 DOCK ET NUMBER 68 69 EVENT DATE 74 7S REPORT DATE 80 EVENT DESC91pTION AND PROBABLE CONSEQUENCES h t o 121 l During aormal operation, at 1141 hours0.0132 days <br />0.317 hours <br />0.00189 weeks <br />4.341505e-4 months <br /> on 06-11-80, the blue instru-I

1. 0l3l l ment bus (lYO2) was deenergized because of personnel error.

Loss of l

1OI*II power to this bus resulted in deenergization of two of the Unit 1 con-l lOlsii tainment pressure channels (P947 and P948) and one of the Unit 2 con-l l0lsiI tainment pressure channels' (P949).

This reduced the minimum degree of l Io1itI redundancy than that required by Technical Specifications for contain-l [Ola!I ment spray and is reportable IAW Technical Specification 13.6.9.2.A.2.

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40 48 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l l An electrician deenergizing the wrong power st oply for maintenance I

lililIcaused the event.

Power was restored to the bus within about one l

,,,,il minute and all instrumentation switched back to its normal supply bus l

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ATTACHMENT TO LICENSEE EVENT REPORT 80-007/0lT-0 Wisconsin ElecP.ric Power Company Point Beach Nuclear Plant Unit 1 Docket No. 50-266 During normal operation, at 1141 hours0.0132 days <br />0.317 hours <br />0.00189 weeks <br />4.341505e-4 months <br /> on 06-11-80, the blue instrument bus (lYO2) was deenergized because of personnel error.

The loss of power to this bus resulted in the deener-gization of two of the Unit 1 containment pressure channels (P947 and P948) and one of the Unit 2 containment pressure channels (P949).

Containment pressure which controls the auto-matic containment spray function is a safeguards function which does not fail in the trip position on a loss of power.

This reduced the minimum degree of redundancy to less than that required by Technical Specifications for containment spray and is reportable in accordance with Technical Specification 15.6.9.2.A.2.

~

An electrician deenergizing the wrong pcwer supply for maintenance caused the event.

Power was restored to the bus l

within about one minute and all instrumentation switched back to its normal supply bus within five minutes for both units.

As a result of this momentary power loss to the blue bus, compounded by steam generator feed regulator valve problems, Unit 1 tripped because of feed flow / steam flow mismatch and steam generator low level.

All systems functioned normally after the trip and the unit was placed back on line approxi-mately two hours later at 1352 hours0.0156 days <br />0.376 hours <br />0.00224 weeks <br />5.14436e-4 months <br />.

This event has been dis:ussed with plant group heads, operating, and maintenance personnel to emphasize the importance of-properly identifying equipment prior to removing from service.

Additional administrative controls are being discussed to prevent recurrence of this type of event.

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