ML17326A546

LER 80-004/03L-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

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: ML17326A544 ML17326A546
References
LER-80-004-03L, LER-80-4-3L, NUDOCS 8003040582
Download: ML17326A546 (2)

Text

)V,.+C FOSIMi366 I~NUCLEAR REGULATORY COMI))IISSION

{7 77I LICENSEE EVENT REPORT CONTROL BLOCK: I f I Qi 'PLEASE PRINT OR TYPE ALL REQUIREO INFORhlATIONI I

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~01 "oo'"oo ~LQR~05 0 0 I 0 3 I I I 0 'Q)jo 2 0 2 Qs 0 2 21 7 8 0/09 7 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 76 RCPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUE)4CES QIO 2 L

THE "B"'AIN TURBINE 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 CONOIYIOAII AS REOUIREO.

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~OS 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE

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CODE CODE" 2 Q ~Q SUBCODE COMPONENT CODE

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ACTIOi4 FUTURE LERIRQ llo)ORT FVENT YEAR

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23 SHVTDOENE4

~PP 24 RFPORT NO.

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27 28 ATTACHMENT CODE

[gJ~29, NPRO 4

)YPE 30 ~

PRIME COMP.

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

~OQTR ~ZQER 33 34 " ~ZQ)o 35

~ZQst 36 37

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t TAI Ii . IVIIEVE, II 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 IN Tt'J SEE ATTACHED SUPPLEMENT.

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8 FACILITY STATUS 9

'E ACTIVITY COI4TENT j~lQ 10 1

41 PONIER 0 0 12 "9

13 oTHER STATUS NA 44 METHOD OF DISCOVERY

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DISCOVERY DESCRIPTION 022 OPERATOR OBSERVATION RELEASED OF RELEASE AMOUNT OF AC IVITY QSS LOCATION OF RELEASE QSB

~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 80 PERSCi4NEL INJURIES NUMBER DESCRIPTION 41

~OI O O Q4oj )PA 7 8 9 11 12 80 LOSS OF OR DAMAGE To FACILITY Q43 7 8 9 ~ '10 80 PUBLICI ~ '4 ISSUED DESCRIPTION 45 Q 8003.{9@{6 '

NRC USE ONLY

)2 oi g j oo. I )IJ(43 10 68 69 I I I I I I 30

)4AME OF PREPARER Jack Risch'ting PHONc 616-465-5901 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.