05000316/LER-1978-099-03, /03L-0 on 781212:pressurizer Pressure Was Reduced to 2215 Psia,Caused by Trip of Circuit Breaker Controlling Instrument Air to Containment.Loss of Air Closed Letdown Valves,Left No Air to Open Spray Valves

/03L-0 on 781212:pressurizer Pressure Was Reduced to 2215 Psia,Caused by Trip of Circuit Breaker Controlling Instrument Air to Containment.Loss of Air Closed Letdown Valves,Left No Air to Open Spray Valves

ML17317A846
Person / Time
Site:	Cook
Issue date:	12/28/1978
From:	Lease R INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317A845	List: 05000316/LER-1978-099, Forwards LER 78-099/03L-0 05000316/LER-1978-099-03, /03L-0 on 781212:pressurizer Pressure Was Reduced to 2215 Psia,Caused by Trip of Circuit Breaker Controlling Instrument Air to Containment.Loss of Air Closed Letdown Valves,Left No Air to Open Spray Valves
References
LER-78-099-03L, LER-78-99-3L, NUDOCS 7901030145
Download: ML17317A846 (4)

LER-1978-099, /03L-0 on 781212:pressurizer Pressure Was Reduced to 2215 Psia,Caused by Trip of Circuit Breaker Controlling Instrument Air to Containment.Loss of Air Closed Letdown Valves,Left No Air to Open Spray Valves

Event date:
Report date:
3161978099R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION NRC FORM 366 I7.77)

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PRESSURIZER LEVEL INCREASED S

CAUSED PRESSURIZER PRESSURE TO INCREASE.

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ATTACHMENT TO LER g 78-099/03L-0 DECEMBER 26, 1978 PAGE 2 THE HIGH PRESSURE SIGNAL.

- AS PRESSURE RAPIDLY DECREASED THE OPERATOR IMMEDIATELY RECOGNIZED THE PROBLEM AND PLACED SPRAY VALVE CONTROLS. IN MANUAL OPERATION AND CLOSED THE VALVES.

PRESSURIZER HEATERS WERE ENERGIZED TO RECOVER PRESSURE.

THE TRIPPED BREAKER WAS RESET AND THE CIRCUIT CHECKED FOR OVERLOAD.

NO OVERLOAD CONDITION WAS FOUND AND NO FURTHER'AGTION IS. PLANNED;

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