05000315/LER-1982-042

LER 82-042/03L-0:on 820524,during Operation,Containment Air Particulate Radiation Monitoring Sys (R-11) Found Operating Erratically.Caused by High Ac Ripple on Low Voltage Dc Power Sys.Low Voltage Dc Power Sys Replaced

ML20054H627
Person / Time
Site:	Cook
Issue date:	06/18/1982
From:	Palmer R INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20054H614	List: 05000315/LER-1982-041 05000315/LER-1982-042 ML20054H613
References
LER-82-042-03L-01, LER-82-42-3L-1, NUDOCS 8206240275
Download: ML20054H627 (1)

LER-2082-042,

Event date:
Report date:
3152082042R00 - NRC Website

text

LICENSEE EVENT REPORT CC'JTROL BLOCK: l l l l l i l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o l 2 I IDURING NORMAL OPERATION, THE CONTAINMENT AIR PARTICULATE RADI ATION MONITORING SYSTEM I l o ! a i l(R-11) FAILED TO THE LOWER END OF THE METER INDICATING SCALE AND BEGAN OPERATIN lotalICALLY. R-11 WAS DEENERGIzED AND DECLARED IN0PERABLE AT 1145 H0( E ON MAY 24, 1982. I I

io I s I ITHIS EVENT IS NON-CONSERVATIVE WITH RESPECT TO TECHNICAL SPECIFICATION 3.3.2.1 TABLE l o ! s i I3.3-3, 3.3.3.1 AND 3.4.6.1. HEALTH AND SAFETY OF THE PLANT WAS NOT AFFECTED. I I

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44 47 JJ CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I

Ii101 1 INVESTIGATION FOUND THAT THE LOW VOLTAGE DC POWER SUPPLY ASSOCIATED WITH R-11. HAD l i t i l I HIGH AC RIPPLE ON THE OUTPUT CAUSING THE SYSTEM TO OPERATE ERRATICALLY. THE LO iii>i l AGE DC POWER SUPPLY, MANUFACTURED DY AUL INSTRUMENTS, MODEL PSD-15 WAS REPLACED. THE i S

iii3i l SYSTEM WAS VERIFIED TO BE OPERATING CORRECTLY AND RETURNED TO 'ERVICE AT 1515 HOU 1

li14i 1 MAY 24, 1982. NO FURTHER ACTION IS PLANNED.

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SUPPLEMENT TO LERM 82-041/03L-0 1

SUPPLINNT TO EVENT DESCRIPTION:

TK UNIT WAS IN TtE INITIAL STAGES OF DILUTION DURitG UNIT STARTUP NO TT

LOW FLOW FEEDWATER MODIFICATION WAS BEING UTILIZED TO SUPPLY.T m SMALL I

QUANTilIES OF WATED FEEDWATER NEEDED TO MEET SYSTEM REQUIREMENTS.

SEAT LEAKAGE OF FRV-220, #12 STENi GENERATOR FEEDWATER REGULATING VALVE, J PREVENTED ADEQUATE CONTROL OF FEED TO T K SYSTEM. FbO-202, THE #12 STEAM

GE E RATOR FEEDWATER ISOLATION VALVE, WAS UTILIZED TO REGULATE FEEDWATER FLOW.  !

j DURING CYCLItG TO MAINTAIN THE DESIRED FEED FLOW CONTROL, TK VALVE FAILED AT APPROXIMATELY '40% OPEN.

j AUXILIARY FEED WAS PLACED,1N SERVICE. THE VALVE WAS REPAIRED, TESTED, Ato MADE AVAILABLE FOR SERVICE. STARTUP OPERATIONS WERE TEN RESLNED. PUBLIC l T ALTH # D SAFETY WERE_NOT AFFECTED. ,

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