ML19339B205

LER 80-029/03L-0:on 801004,inverter 23 Failed,Leaving Panel 213 de-energized.Caused by Failure of Sola Constant Voltage Transformer.Panel Transferred & Transformer Replaced

ML19339B205
Person / Time
Site:	Prairie Island
Issue date:	10/31/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19339B204	List: ML19339B203 ML19339B205
References
LER-80-029-03L-01, LER-80-29-3L-1, NUDOCS 8011060496
Download: ML19339B205 (1)

Text

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w LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

, CONTROL BLOCK: l 1

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Ind lM 8 9

!N lP lI lN l 2]@l 0 l 0 l - 10 l 0LICENSE LICENSEE CODE 14 15 l 0 lNUMBER 0 l 0l -l 0 l 0 l@l 25 426 l1 LICENSE l 1 l 1TYPE l 1JOl@lb7 CAT l 68 l@

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" T 1011l $"C Ql 0 l 561 l 0 l 0DOCKET l 0 NUMBER l 3 l 0 l6 l@l1 l0 10 14 i 8 10 l@l1 74 75 l1 REPORT l3 11 18 l080l@

7 8 60 68 69 EVENT DATE DATE EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h l0l2l l During power operation No. 23 inverter failed, leavinn Panel 213 deener21 zed i IO la1 i for a few minutes. Reactor protection system functions of the failed instrument i 1014 l l channel deenergized to the trip position. Panel 213 was manually transferred l

[O isI i to Panel 217 within a few minutes. No effect on public health and safety. l

o is ; l Previous events were RO's 77-08 and 76-49. Tech Spec 3.7.A.4 applies. I 10171 l I I

10181I E CODE S SC E COMPONENT CODE SUB ODE SU E ibl91 7 8 I vi nl@ l El@ l Alh lT IR l A lN l S lF lh lZ lh d @

9 to 11 12 13 18 19 20

_ SEQUENTIAL OCCURRENCE REPORT REVislON LE R FRO EVENT YE AR REPORT NO. CODE TYPE NO.

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_ 21 19Inl 22 L---J 23 1012 l 9 l 24 26 Ig_]

27 l0 l31 N M I t!

30 L-J 31 LO_1 32 KN AC N oN PL NT ME HOURS SB i POR 8. $UPPLIE MANU A TURER I3Jx l@Lztl@ LzJ@ Lzj@ lnIoIoInl

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34 3$ 36 40 42 43 &# 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h

,, ;o; } Failure of a Sola constant voltage transformer. Panel 213 was manue,lly l

,, ,,, ; transferred to Panel 217. The transformer was replaced and the inverter l

,, ,,, g returned to service the next day. Replacement of Unit 2 inverters is being l contemplated; the Unit 1 instrument bus inverters have been replaced with l

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,, , , , ; inverters having automatic static transfer switches. l 7 8 9 80 ST A' S  % POWER oTHER STATUS Dis O RY DISCOVERY CESCRIPTION I1l5llEl@ l1l0l0l@l NA l W @l cn e n, p n n,., n nn,,n ,. 4 .,,. 4 nn l 7 8 9 1 12 13 44 45 46 80 RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE l1 I ss 9l W @D 05 RELEASEW@l NA l l NA l 7 10 11 44 45 80 ,

PERSONNEL EXPOSURES l NUMBER TYPE DESCRIPTION i 11 l 71 l 0 l 0 l 0 l@l Z l@l NA i

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PERSONNE L INJURIES '

NUVBER DESCRIPTION

[7 Tu~l l 0 l 0 l 0 l@] NA l j 8 9 11 12 80 LOSS OF OR DAMAGE TO FACll.lTY TYPE DESCRIPTION li l o l [Z j@l NA l 7 89_ 10 80 PUBLICITY O gf NRC USE ONLY

• 12 l 801 ISSUED Whl DESCRIPTION U NA 80110607m l lll1lllllll1l}/.

7 9 10 68 69 80j -

NAME OF PREPARER

. . unstad PHONE:

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