05000306/LER-1980-029-03, /03L-0:on 801004,inverter 23 Failed,Leaving Panel 213 de-energized.Caused by Failure of Sola Constant Voltage Transformer.Panel Transferred & Transformer Replaced

/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: 05000306/LER-1980-029, Forwards LER 80-029/03L-0 05000306/LER-1980-029-03, /03L-0:on 801004,inverter 23 Failed,Leaving Panel 213 de-energized.Caused by Failure of Sola Constant Voltage Transformer.Panel Transferred & Transformer Replaced
References
LER-80-029-03L-01, LER-80-29-3L-1, NUDOCS 8011060496
Download: ML19339B205 (1)

LER-1980-029, /03L-0:on 801004,inverter 23 Failed,Leaving Panel 213 de-energized.Caused by Failure of Sola Constant Voltage Transformer.Panel Transferred & Transformer Replaced

Event date:
Report date:
3061980029R03 - NRC Website

text

)w LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l

lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

Ind lM !N lP lI lN l 2]@l 0 l 0 l - 10 l 0 l 0 l 0 l 0l -l 0 l 0 l@l 4 l1 l 1 l 1 l 1 l@l l

l@

8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO b7 CAT 68 CON T 1011l

$"C Ql 0 l 5 l 0 l 0 l 0 l 3 l 0 l6 l@l1 l0 10 14 i 8 10 l@l1 l1 l3 11 18 l0 l@

T 7

8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 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

10181I I

E CODE S SC E COMPONENT CODE SUB ODE SU E

ibl91 I vi nl@ l El@ l Alh lT IR l A lN l S lF lh lZ lh d @

7 8

9 to 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVislON LE R FRO EVENT YE AR REPORT NO.

CODE TYPE NO.

O sgg 19Inl L---J 1012 l 9 l Ig_]

l0 l31 I t!

L-J LO_1 a

_ 21 22 23 24 26 27 N

M 30 31 32 KN AC N

oN PL NT ME HOURS SB i POR 8.

$UPPLIE MANU A TURER 14Isl@

I x l@Lztl@

LzJ@

Lzj@

lnIoIoInl Lx.J@

LLl@

lAl@

LS 's 3J 34 3$

36

?

40 41 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

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 I s l W @D 05 RELEASEW@l NA l

l NA l

l1 7

s 9 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

]

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 8 9 _

10 80 PUBLICITY O

gf NRC USE ONLY ISSUED DESCRIPTION U 80110607m 12 l 01 Whl NA l

lll1lllllll1l}/.

7 8 9 10 68 69 80j unstad NAME OF PREPARER PHONE: