05000316/LER-1979-002-03, /03L-0 on 790106:during Startup,Auxiliary Feedwater Motor Operated Valve Would Not Close Due to Broken Wire in SMB-0-25 Operator.Caused by Vibration & Use of Solid Conductor

/03L-0 on 790106:during Startup,Auxiliary Feedwater Motor Operated Valve Would Not Close Due to Broken Wire in SMB-0-25 Operator.Caused by Vibration & Use of Solid Conductor

ML17317A925
Person / Time
Site:	Cook
Issue date:	02/05/1979
From:	Wizner D INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317A924	List: 05000316/LER-1979-002-03, /03L-0 on 790106:during Startup,Auxiliary Feedwater Motor Operated Valve Would Not Close Due to Broken Wire in SMB-0-25 Operator.Caused by Vibration & Use of Solid Conductor 05000316/LER-1979-003-03, /03L-0 on 790106:reactor Trip/Safety Injection Occurred.Caused by Freezing of Steam Generator/Main Steam Pressure Sensing Lines.Freezing Due to Failure to Close Off Steam Vent Openings in West Steam Encl ML17317A923
References
LER-79-002-03L, LER-79-2-3L, NUDOCS 7902120112
Download: ML17317A925 (2)

LER-1979-002, /03L-0 on 790106:during Startup,Auxiliary Feedwater Motor Operated Valve Would Not Close Due to Broken Wire in SMB-0-25 Operator.Caused by Vibration & Use of Solid Conductor

Event date:
Report date:
3161979002R03 - NRC Website

text

NRC FORM 366 LlCENSEE EVENT REPORT CONTROL BLOCK:

QI tPLEASE PRINT OR TYPE ALLREQUIRED INFORMATION)

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5 [oat]

M I

D C

C 2

QE 0

0

0 0

0 0

0

0 0

Qg 4

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I I 04~05 7

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LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T

~LQB 0

5 0

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3 1

6 Qj 0

1 0

6 7

9 Qs 0

2 0

5 7

Qe 7

8 60 61 DOCKET NUMBER 69 EVFNT PATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10

~02 DURING A UNIT 2 STARTUPp AUX FEEDWATER MOV TO 83S/G FMO 232 WOULD NOT CLOSE.

THIS CONSTITUTED AN INOP.

FLOW PATH PER T.S. 3.7.1.2.

A BROKEN 4

~os

~06 WIRE WAS FOUND IN THE OPERATOR.

THE BREAK OCCURRED AT THE BASE OF A FORMED EYELET OF A SOLID CONDUCTOR CONTROL CABLE TERMINATION ON THE TORQUE SWITCH.

ALL AUX.

FEEDWATER MOV'S IN BOTH UNITS WERE INSPECTED.

SIMILAR 'ROKEN WIRES WERE FOUND IN UNIT 2 FMO-222 AND UNIT 1 FM0-231.

(DOCKET NO. 050-315).

A SIMILAR EVENT WAS REPORTED AS RO-78-063/03L/0.

~OS 80 7

8 SYSTEM

CAUSE

CAUSE COMP.

VAI.VE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~CH Q11 E

Q12

~A Q12 V

A L

V 0

P Q14

@AD Q15

~Z Q1g 7

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10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LF R/RP EVENT YEAR REPORT NO.

CODE TYPE NO.

Q17 REPORT

~79

+

~QP

+~

~Q3

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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 Q18 ~PQ19

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33 34 35 36 37 40 41 42 43 44 47

'AUSE DESCRIPTION ANDCORRECTIVE ACTIONS Q27 0

BROKEN WIRES IN ALL 3 LIMITOR UE SMB-0-25 OPERATORS WERE REPAIRED. THE WERE TESTED AND RETURNED TO SERVICE.

FAILURES WERE APPARENTLY CAUSED BY VIBRATION AND THE USE OF SOLID CONDUCTOR '," IWIRING AT THE TERMINATIONS.

A DESIGN CHANGE HAS BEEN INITIATED.

UNTIL THAT CHANGE IS COMPLETED' ELECTRICAL CONNECTIONS IN THE OPERATORS WILL BE INSPECTED QUARTERLY.

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ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITY z

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N/A 7

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10 11 44 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

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QET ~2028 N/A 7

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11 12 13 PERSONNEL INJURIES LOCATIONOF RELEASE Q N/A 45 7

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FACILITY

~30 METHOD OF STATUS

% POWER OTHER STATUS ~

DISCOVERY DISCOVERY DESCRIPTION Q32 1

5

~0028

~00 2

Qg N/A

~A031 DURING VALVE OPERATION 8

9 10 12 13 44 45 46 80 80 80 80 7

8 7

8 O

7 8

9 11 12 LOSS OF OR DAMAGETO FACILITYQ TYPE

DESCRIPTION

~z042 N/A 9

10 PUBLICITY ISSUED DESCRIPTION~

WQ44 N/A 9

10 D.G.

WIZNER NAME OF PREPARER 80 80 NRC USE ONLY O

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68 69 616-465-5901 PHONE:

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