ML19318C388

LER 80-007/01T-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

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: ML19318C376 ML19318C388
References
LER-80-007-01T, LER-80-7-1T, NUDOCS 8007010420
Download: ML19318C388 (2)

Text

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1. 8- 61 DOCK ET NUMBER 68 EVENT DATE 74 7S 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. l 7 8 9 80 DE CODE SUSC E COMPONENT CODE SU8 COO'E SU E 10191 7 8 l ElB l@ W@ l Cl@ l Zl ZlZ lZ lZ lZ l@ lZ l@ @ @

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l 0 l0 l0 l 3/ 40 l gg 48 l N lg 42 gg 43 l WlI l 2 l 0 lg 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 ,

g l within five minutes for both units. 1 i 4 l l 7 8 9 80 STA S  % POWER OTHER STATUS Di RY DISCOVERY DESCRIPTION u,j s_] LE_J@ l o I 810 l@l N/A l l A l@l Operator observation l l

ACTIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 @ [Z_,j@l N/A l l N/A l PERSONNEL EXPOS ES NUM8ER TYPE DESCRIPTION ITTTl l 010 l O l@lZ l@l" N/A i

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' PERSONNEt iNau'R'iES NUMBER OESCRIPTIOd i R l 010 l 0 l@l12 N/A l 7 8 9 11 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION 7

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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.

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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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