05000316/LER-1979-042-03, /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

/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: 05000316/LER-1979-042-03, /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 ML17326A375
References
LER-79-042-03L-01, LER-79-42-3L-1, NUDOCS 7912100286
Download: ML17326A377 (2)

LER-1979-042, /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

Event date:
Report date:
3161979042R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION ENSEE EVENT REPORT LICENSE TYPE 30 57 CAT 58 hlRC F(PM 366 i i77)

'f-CONTROL BLOCK:

Q1

{PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION)

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LICENSEE CODE 14 15 LICENSE NUMBER 25 26 CON'T

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9 SOURCE 7

8 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

~Os CONTRACTOR PERSONNEL MISTAKENLY BEGAN TO DETERMINATE THE OPERABLE 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 7

8 SYSTEM

CAUSE

CAUSE COMP VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE Q11

~7E 072

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z z

z z

z 04

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10 11 12 13 18 19 20 SEOUENTIAL OCCURRENCE REPORT REVISION LERiRP EVENT YEAR REPORT NO.

CODE TYPE NO.

Q17 REPQRT ~O

~

~Q4 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDP PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER IJLIQ18 ~Q19

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33 34 35 36 37 40 41 42 43 44 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 80 80 45 80 80 80 7)(zgoo ra~

80 NRC USE ONLY o

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NAME OF PREPARER PHONE:

SHORT CXRCUXT AND BLOWXNG A FUSE XN THE 1KV XNVERTER

'7 8,

9 FACILITY

~3P METHOD OF STATUS

% POWER OTHERSTATUS ~

DISCOVERY DISCOVERY DESCRIPTION Q32

~A037 7

8 9

10 12 13 44 45 46 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ LOCATIONOF RELEASE Q36

~76

~Z 033

~Z034 NA NA 7

8 9

10 11 44 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

7

~o0oo o0 Q3 7 z

Q3 8 NET 7

8 9

11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION 41 8

~OO O

Q46 NA 7

8 9

11 12 LOSS OF OR DAMAGETO FACILITYQ43

'TYPE

DESCRIPTION

e Z

Q42 NA 7

8 9

10 PUBLICITY ISSUED

DESCRIPTION

~20

~N Q44 NA 7

8 9

10 68 69

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 GIVEN 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.