ML20085F774

Telecopy AO 74-10:on 740609,dc Control Power Break 72-203, 100 Amp,Tripped.Incident Under Investigation.Sys Restored to Normal

ML20085F774
Person / Time
Site:	Palisades
Issue date:	06/11/1974
From:	Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Cook R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085F780	List: ML20085F774 ML20085F782 ML20085F823
References
AO-74-10, NUDOCS 8308230187
Download: ML20085F774 (5)

Text

- - _ _ . . . . . - - - - . . - . . - - . . - - - .

mestern.EJLEunion M '

• Telegram w -

l VEC279(1720)(l-038250 C162)PD OG'Ri$74 jji7 ,

i TLX CONSPOWER JKN mW0 ZCIC 005 6-Il-74 JACK SOENICff" (C .

_An )

PMS 799 ROOSEVELT ATOMIC RO AD in, . ENERGY

& C0%["$3M'* ION'T " ~

l GLEN ELLYN, IL - ATff i (1-C00X i, t t , r e u ._

J$ '-

, W 303 JECT ABNORMAL OCCURRENCE 74-10

1. 8 r"$ TO CONFIRM MY VERSAL CONVERSATION WITil YOU YESTERDAY, 6/10/74, )

'L 58 THE FOLLOWING INFO R MAT IO N IS PROVIDED PER TECH SPEC SECTION 1.4 .D .

(QQ

,y n E AT APPROXIMATELY 1615 HOURS ON 6/9/74, THE OPERATOR REPORTED 10 t/

I THE SHIFT SUPERVISOR THAT THE INDICATING LIGHTS FOR THE CIRCUIT 1 3REAKERS ON BUS ID WERE 0 01. AN IMMEDIATE CHECK AT BUS ID RE- b i ,

ss

'E R E M 8 8 i w

mestern union Telegram -)

j

\

191h JUj ; I fll la 27 '

VEALED THE LOCAL LIGHTS WERE ALSO OUT e FURTHER INVESTIGATION RE-VEALED THE D.C. CONTROL POWER BREAKER 72-203, 100 AMP, WAS TRIPPED.

THE OPERATOR ATTEMPTED TO RESET THE BRE AKER SEVERAL TIMES BUT IT WOULD NOT RESET.

THE PLANT ELECTRICAL SUPERVISOR ACTING WAS CALLED AND HE IMMEDIATELY CAME IN WITH AN ELECTRICIAN TO TROUBLESHOOT Tile PROBLEM. THE FOLLOW l IN3 WAS LEARNED: l 4

1. THERE WERE N0 GROUND INDICATIONS.

2. THE FEED TO ID WAS CHECKED FOR GROUNDS AND SHORTS WITH AN OHM-METER.

I

' f

{ ,-, .., ( q

i <1

1. ~

mM mestern union ' Tele ram 5

0 .

l 197t ji'~. I I Pii t,: g7

3. BREAKER 72-283 VAS CHECKED WITH THE FEED REPDVEB - IT RESET OK.

4. ALL FUSE BLOCKS AT EACH SRE AKER ON ID BUS WERE CHECKED VISUALLY FOR SIGNS OF SHORTS, LOOSE WIRES, ETC.

S. VISUALLY CHECKED THE CABLE FROM THE BUS TO THE BREAKER.

6. CHECKED THE RESISTANCE READINGS AT EACH FUSE BLOCK INDIVIDUALLY.

r NO ABNORMALITIES WERE FOUND IN ANY OF THE A50VE CHECKS. AT THIS POINI THE POSITIVE AND NEG ATIVE WIRES WERE RECONNECTED TO THE BREAKER 72-203 WITH THE LOCAL FUSES OUT AND THE BREAKER RESET OK. THE ELEC-TRICIAN THEN STARTED PUTTING THE FUSES IN BREAKER 152-201. THE FUSE FOR BREAKER CLOSE WENT IN OK. HOWEVER, WHEN THE FUSE FOR BREAKER

__ sr,.m inm ,_

• i -

EAE M ' '

'TeleNram

. ~

,1 mestern union

w ,

197tr T I I fil !,: g7 TRIP WAS INSERTED, THE D.C. BREAKER 72-203 TRIPPED AGAIN. THE FUSE VAS REMOVED AND BREAKER 72-203 WAS RESET. THE REST OF THE FUSES WERE INSERTED WITHOUT INCIDENT. THE ELECTRICIAN THEN WENT B ACK TO PUT TB FUSE IN BREAKER 152-201 TO FROVE ABSOLUTELY THAT IT TRIPPED THE D.C.

BREAKER 72-203 AND IT WENT IN OK, IE, THE D.C. SREAKER 72-2C3 DIS NOT TRIP. FURTHER EFFORTS TO SIMULATE THE INCIDENT FAILED TO CAUSE BREAKER 72-203 TO TRIP, So THE SYSTEM WAS RESTORED TO NORMAL AT ABOUT 2230 HOURS.

(

09 6/10/74 THE INCIDENT WAS DISCUSSED AND RESEARCHED FURTHER - NO I

ADDITIONAL INFORMATION WAS OBTAINED.

lI ON 6/11/74 THE WIRING WAS MEGGEMED AT Soo VOLTS D.C. AND THE FUSE BLOCK IN BREAKER 152-201 WAS INSPECTED - NO ABNORMALITIES WERE FOUND.

I' er.d, mue, i l

k

.i

,l I

C l .,

(.

1. 4 ele ram f

I W E.E mesterrt union w ~ .

1970J!!Iii Fl I,: 27 1 l

AT THIS TIME, THE INCIDENT IS STILL UNDER INVESTIG ATION. FURTHER ,

INFORMATION WILL BE PROVIDED TO YOU WHEN THE INCIDENT HAS BEEN RE SOLVED .

R 5 DE WITT ~

PALISADES PLANT ,

CONSUMERS POWER COMPANY A,

CBW l

! I CC: R L HAUETER NNNN .

f JijN ,3 : ..

I

_ _ _ . _ . - _ . - - _ _ _ - - _ . - . - . _ -