05000237/LER-1979-039-03, /03L-0 on 790528:125 Volt Dc Switch 2,reserve Feed Bus 22, Was Opened Causing Trip of 282 Recirculation Motor Generator Set Oil Pump.Caused by Inadvertent Opening of Switch.Switch Marked to Caution Against Opening

/03L-0 on 790528:125 Volt Dc Switch 2,reserve Feed Bus 22, Was Opened Causing Trip of 282 Recirculation Motor Generator Set Oil Pump.Caused by Inadvertent Opening of Switch.Switch Marked to Caution Against Opening

ML19270H019
Person / Time
Site:	Dresden
Issue date:	06/15/1979
From:	Ammer A COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A928	List: 05000237/LER-1979-039, Forwards LER 79-039/03L-0 05000237/LER-1979-039-03, /03L-0 on 790528:125 Volt Dc Switch 2,reserve Feed Bus 22, Was Opened Causing Trip of 282 Recirculation Motor Generator Set Oil Pump.Caused by Inadvertent Opening of Switch.Switch Marked to Caution Against Opening
References
LER-79-039-03L, LER-79-39-3L, NUDOCS 7906220373
Download: ML19270H019 (1)

LER-1979-039, /03L-0 on 790528:125 Volt Dc Switch 2,reserve Feed Bus 22, Was Opened Causing Trip of 282 Recirculation Motor Generator Set Oil Pump.Caused by Inadvertent Opening of Switch.Switch Marked to Caution Against Opening

Event date:
Report date:
2371979039R03 - NRC Website

text

r...o v.......~

(7471

.e LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l

l (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION) 1 6

o 11 lI I hlD I RlSl2 l0l0l-l0l0l0l0l-l0l0l lgl4l1l1l1l1]gl l

[g i

8 9 LICEN5dE CODE 14 16 LICLASE NU'.WER 26 26 LtCINSE TYPE JG 67 CAT bd CON'T oi1 [EPC lL @l0 5 l0 l0 l0 l2 l3 l 7 @l 0 l 5 l 2 l 8 l 7 l 9 l@l0 l6 l1 1 5l 7l 9 l@

,RC 7

8 6J G1 DOCKET NUM8;n 64 G3 EVENT DATg 74 75 REPoHT DATE 80 EVEN T DESCRIPTION ATJO PROB AOLE CONSEQUENCES h g uring normal operation, the 125V DC switch No. 2, " Reserve Feed, Bus 22,"

l D

g

,was opened during ground checks on Unit 2 turbine building main bus.

As

[

g,3 a result, 2B2 recire. MG set oil pump tripped, followed by a trip of the 23 l

g,,

y re ire. MG set.

The A MG set speed was reduced <65% as required by the Technical l

o si i Specifications (Sec. 3.6.H.4).

No Technical Specifications for the reactor o t o_

I

, parameters were exceeded, and, therefore the safety significance of this event was l

g,,

minimal.

00 7

8 0 SYSTE M

CAUSE

CAUSE

. C O',' P.

VALVE CCCE CCOE SUSCODE CCMPCNENT CCDE SUBCCOE SUSCCQE l@ LAJ @ ! c lx I T In la lx l@ l E I@ L7J @

1019 lc la l@

^

7 8

9 10 11 12 13 14 1 ')

20 :

SE CUC NTI AL CCCU A R ENCE F3 C TORT R E VISiCN lVEi4T YE AR l-l l0l3l9l l/l 10 l 3l lLl

[--]

l0l 7l9l LOL2 1YPE N O.

RE' ORT No.

ttp nC k

@ ggy

_2i 22 23 24 a

21 2s a

30 3i 32 TAKE4 AC T O C PLANT M TM HCURS 22 S e T f Cf fl S PLIE ~

MAN FACT ER l XlglJ4X [ g l5 lg [6Zl@

l 0 l0 l 010 l lN l@

lN l@

lA l@

Cl7l710l@

3 33 3

3 37 40 el 42 43 44 47 CAUSE DEf.CRIPTION AND CORRECTIVE ACTICNS @

o] l Opening switch #2 resulted in a loss of control power to the 23 recire. MG l

i

, ii l set causing it to trip.

Switch #2 was reclosed immediately, and 23 recire. MG set i

restarted.

Switch #2 was marked to caution against opening. No similar event I

,,, l

,,,.g, l encountered in the past.

l i

,4 1

l 7

8 9 83 ST

% POWER oTHER STATUS I

RY DISCOVEHY DESCR191 tCN l- @ l 0 l 9 l 6 l@j NA l

l B l@l Operator observation l

i s

ACTIVITY CCr TENT RELEASE F RELEASE AMOUNT OF ACTIVITY LOCATION CF REL EASE Ic ] [Z ]

NA l

l NA l

7 8 9 _

l Zl@]

1 10 11 44 45 80 PER!CNNEL EXPCSURES NUUSER TYPE CESCdiPTICr4

~

l 101010 l@lZ l@l NA i

7 PE PS GNN E L INmn t ES N'1"a E R DESCRIPTICN hj l 0 l 0 l 0 l@l

~

NA l

J 8 0 11 17 80 LCSS OF On O#'.tAGE To FACit.f TY Tyre fees 0alPf aQ 4 NA l

li o IZl@

t 8 s to CO PUE(tCi ty NHC USE CNLY Ni 790ee20s73 g,,,,,,,,,,,,l}

gg="'"e f

8 9 to C4 G9

83. K I

NAMt Or pnEPARER PHONE: