ML17326A377

LER 79-042/03L-0:on 791101,while in Mode 6,w/one Diesel Generator Out of svc,1kV Inverter Blew Fuse.Caused by Loose Bus Feed Cable Short Circuiting Inverter While Contractor Personnel Worked on Inoperable Generator

ML17326A377
Person / Time
Site:	Cook
Issue date:	12/03/1979
From:	INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17326A376	List: ML17326A375 ML17326A377 ML17326A378
References
LER-79-042-03L-01, LER-79-42-3L-1, NUDOCS 7912100286
Download: ML17326A377 (2)

Text

hlRC 366 U. S. NUCLEAR REGULATORY COMMISSION i i77)F(PM

'f- . -- ' ENSEE EVENT REPORT CONTROL BLOCK: Q1 {PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

I 6

~o1 M I D C C 2 Q2 0 0 0 0 0 0 0 0 0 0 0 25 0 26 LICENSE TYPE 30 57 CAT 58 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER CON'T

~o] 8 RF-o ~L~B 0 5 0 0 0 3 6 Q7 1 o 1 QS o 3 7 9 SOURCE 7 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES &10 WHILE XN MODE 6,WITH. ONE .DXE EG GENERATOR (DG) OUT OF SERVXCE CONTRACTOR PERSONNEL MISTAKENLY BEGAN TO DETERMINATE THE OPERABLE

~Os DG'S STARTING BUS FEED CABLE, BLOWING A FUSE XN THE 1KV INVERTER.

THIS RENDERED THE DG INOPERABLE UNTX'L THE DG INVERTER WAS SWITCHED

~06 TO AN ALTERNATE SUPPLY, A PERlOD OF 45 MINUTES. THIS EVENT IS NON-CONSERVATIVE IN RESPECT TO T.S. 3.8.1.2.b.

~os 80 7 8 SYSTEM CAUSE CAUSE COMP VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE Q11 ~7E 072 ~F Q13 z z z z z z 04 ~z 076 ~z 016 7 8 9 10 11 12 13 18 19 20 SEOUENTIAL OCCURRENCE REPORT REVISION Q17 LERiRP REPQRT EVENT YEAR

~O 21 22

~

23

~Q4 24 REPORT NO.

26 27 28 CODE 29 TYPE 30 31 NO.

32 ACTION FUTURE TAKEN ACTION IJLIQ18 33

~Q19 34 EFFECT ON PLANT

~iQ20 35 SHUTDOWN METHOD

~i027 36 37

. o HOURS Q22 o o o 40 ATTACHMENT SUBMITTED

~~023 41 NPRDP FORM SUB.

~024 42 PRIME COMP.

SUPPLIER Lg026 43 44 z

COMPONENT MANUFACTURER 9 9 '"

47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 o

INVESTXGATION REVEALED THAT CONTRACTOR PERSONNEL WHO WERE INSTALLING A DESIGN CHANGE ON THE INOPERABLE DGi HAD MISTAKENLY STARTED DETERMXNATXNG THE OPERABLE DG1S STARTING BUS FEED CABLE THE LOOSE CABLE CAME XN CONTACT WITH AN ADJACENT TERMINAL BLOCK CAUSING A SHORT CXRCUXT AND BLOWXNG A FUSE XN THE 1KV XNVERTER

'7 80 8, 9 FACILITY STATUS  % POWER OTHERSTATUS ~

~3P METHOD OF DISCOVERY

~A037 DISCOVERY DESCRIPTION Q32 7 8 9 10 12 13 44 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY Q LOCATION OF RELEASE Q36

~76 ~Z 033 ~Z034 NA NA 80 7 8 9 10 11 44 45 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 7 ~o0oo o0 Q3 7 z Q3 8 NET 7 8 9 11 12 13 80 PERSONNEL INJURIES NUMBER DESCRIPTION 41 8 ~OO O Q46 NA 80 7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY 7)(zgoo ra~

'TYPE DESCRIPTION Q43 e Z Q42 NA 7 8 9 10 80 PUBLICITY NRC USE ONLY ISSUED DESCRIPTION o

~20 ~N Q44 NA 68 69 80 o 7 8 9 10 0

NAME OF PREPARER PHONE:

SUPPLEMENT TO LER 0 79-042/03L-0 SUPPLEMENT TO CAUSE DESCRIPTION THE INVERTER WAS SWXTCHED TO AN ALTERNATE POWER SUPPLY UNTXL THE FUSE WAS REPLACED. THE INVERTER WAS THEN SWITCHED BACK TO ITS NORMAL POWER SUPPLY. TO PREVENT RECURRENCE g THE CONTRACTOR PERSONNEL WERE G IVEN ADD ITIONA'L TRAINING ON NOVEMBER 08@ 1979 WHICH REVIEWED THE REQUIREMENTS FOR WORKXNG IN CRITICAL AREAS ON SAFETY RELATED EQUIPMENT. PARTICULARLY REQUIRE-MENTS .FOR CABLE REMOVAL AND WORK AUTHORIZATIONS.