05000316/LER-1980-004-03, /03L-0:on 800202,during Normal Operation,While Investigating Problem W/Test Circuit for B Main Turbine Stop Valve,Found Mounting Bracket for Proximity Switch Failed. Caused by Loosened Mounting Assembly Due to Vibration

/03L-0:on 800202,during Normal Operation,While Investigating Problem W/Test Circuit for B Main Turbine Stop Valve,Found Mounting Bracket for Proximity Switch Failed. Caused by Loosened Mounting Assembly Due to Vibration

ML17326A546
Person / Time
Site:	Cook
Issue date:	02/27/1980
From:	Rischling J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17326A545	List: 05000316/LER-1980-004, Forwards LER 80-004/03L-0 05000316/LER-1980-004-03, /03L-0:on 800202,during Normal Operation,While Investigating Problem W/Test Circuit for B Main Turbine Stop Valve,Found Mounting Bracket for Proximity Switch Failed. Caused by Loosened Mounting Assembly Due to Vibration
References
LER-80-004-03L, LER-80-4-3L, NUDOCS 8003040582
Download: ML17326A546 (2)

LER-1980-004, /03L-0:on 800202,during Normal Operation,While Investigating Problem W/Test Circuit for B Main Turbine Stop Valve,Found Mounting Bracket for Proximity Switch Failed. Caused by Loosened Mounting Assembly Due to Vibration

Event date:
Report date:
3161980004R03 - NRC Website

text

)V,.+C FOSIMi366

{7 77I LICENSEE EVENT REPORT I~NUCLEAR REGULATORY COMI))IISSION 7

8 CON'T CONTROL BLOCK:

I f

I Mti D fc C

~JQ2 9

LICENSEE CODE I2)~u~lLJ~

Qs LICENSE NUIEIBER I

Qi

'PLEASE PRINT OR TYPE ALLREQUIREO INFORhlATIONI Olo O

O "oo'"oo ~LQR~05 0

0 I 0 3

I I I 0 'Q)jo 2

0 2

60 61 DOCKET NUMBER 68 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUE)4CES QIO L

2

~01 Qs 0

2 21 7

8 0/09 7

8 74 76 RCPORT DATE 80 THE "B"'AINTURBINE STOP VALVE, IT WAS DISCOVERED THAT THE MOUN'I ING BRACKET FOR THE I

PROXIMITY SWITCH HAD f:AILED.

THIS PROXIMITY SWITCH PROVIDES TURBINE STOP VAlVE I

O IS

.CLOSURE INDICATIOII FOR THE REACTOR PROTECTION SYSTEM.

THIS IS NON-CONSERVATIVE IN

. RESPECT TO.-T.S.

TABLE 3.3-1 iTEM 18.B.

THE AFFECTED CHANNFL WAS PLACED IN THE TRIP L

CONOIYIOAII AS REOUIREO.

~OS 80 7

8 9

SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE" SUBCODE COMPONENT CODE SUBCODE SUBCODE

~o) 2

~t>

Q>>

2 Q ~ Q ~I~Y~LIIIQ LLIQ [z> Q 7

8 9

10 11 12 13 18 19 SEQUENTIAL OCCURRENCE RLPOPT REVISIOI'I LERIRQ FVENTYEAR RFPORT NO.

CODE

)YPE NQ.

G) llo)ORT ~gP

~

~PP O.

~~

[gJ~

21 22 23 24 26 27 28 29, 30

~

31 32 ACTIOi4 FUTURE EFFECT SHVTDOENE4 ATTACHMENT NPRO 4 PRIME COMP.

COMPOi'IENT TAKEN ACTION ON PLANT h'IETHOD HOURS Q22 SUBMITTED FORh1 SUB.

SUPPLIFR MANUFACTURER

~OQTR ~ZQER

~ZQ)o

~ZQst

~0~00 I 0.

I Y I Q22

~NQ24 LAgQ>>

~i~l~liQRF 33 34 35 36 37 40 41 42 43 44 47 CAUSE OFSCRIPTICN ANO CORRECTIVE ACTIONS Q27 V* TI IITIOA lt-" ALE II I

R I' IIELI St 2AEV:.AO~

t TAI I i IVIIEVE, I I tT Itl I il IOIIL 0

"AVE:

tVE

~

IIV EVENT STOP VALVE "B" HAD ACTUALLY SHUT.

THE PROXIMITY SWITCH ITSELF DID NOT FAIL.

3

.THE'FAILURF. WA IN

" tI NTI G ASSEMBLY. WHICH VIBRATED I OSE.

T PRF F

SEE ATTACHED SUPPLEMENT.

IN Tt'J 7

8 9

FACILITY STATUS 41 PONIER oTHER STATUS 0

~

'E 1

0 0

"9 NA METHOD OF

)

DISCOVERY DISCOVERY DESCRIPTION 022

~A QSI[

OPERATOR OBSERVATION LOCATIONOF RELEASE QSB NRC USE ONLY I

I I

I I

I 68 69 616-465-5901 8003.{9@{6 10 Jack Risch'ting PHONc

)4AME OF PREPARER CK LJQ>> j~lQ 7

8 9

10 12 13 44 ACTIVITY COI4TENT RELEASED OF RELEASE AMOUNTOF AC IVITYQSS

~1e

~Z 033

~ZQ3.

NA 7

8 9

10 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 039

) ~00 0 Qs) ~ZQ)s NA 7

8 9

11 42 13 PERSCi4NEL INJURIES NUMBER DESCRIPTION 41

~OI O

O Q4oj

)PA 7

8 9

11 12 LOSS OF OR DAMAGETo FACILITYQ43 7

8 9

~

'10 45 PUBLICI ~ '4 ISSUED DESCRIPTIONQ g j oo.

I )IJ(43 80 80 80

)2oi 30 0

SUPPLEMENT TO LFR iv'80-004/03L-0 SUPPLEMENT TO CAUSE DESCRIPTION

. ASSEMBLY AND PROXIMITY SWITCH CONFIGURATION MAS INSTALLED AS A RESULT OF

.-:--.A PREVIOUS ENGINEERING EVALUATION.

NO FURTHER ACTiON IS PRESENTLY PLANNED AS A RESULT OF THIS EVENT.