05000368/LER-1978-030-03, /03L-0 on 781227:in Mode 1 Operation,During Main Turbine Roll,Main Steam Relief Valves 2PSV1053 Lifted,Due to Steam Dump Valve Failures.Failed to Reseat,Causing Excessive RCS Cooldown

/03L-0 on 781227:in Mode 1 Operation,During Main Turbine Roll,Main Steam Relief Valves 2PSV1053 Lifted,Due to Steam Dump Valve Failures.Failed to Reseat,Causing Excessive RCS Cooldown

ML19269C283
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/25/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19269C282	List: 05000368/LER-1978-029-03, /03L-0 on 781227:in Mode 1 Operation,During Main Turbine Roll,Main Steam Relief Valve 2PSV1053 Lifted,Due to Steam Dump Valve Failures.Valve Failed to Reseat,Causing RCS Temp to Drop 107 Feet within 52 Min 05000368/LER-1978-030-03, /03L-0 on 781227:in Mode 1 Operation,During Main Turbine Roll,Main Steam Relief Valves 2PSV1053 Lifted,Due to Steam Dump Valve Failures.Failed to Reseat,Causing Excessive RCS Cooldown 05000368/LER-1978-032-03, /03L-0 on 781228:during Mode 2 operation,2P7A, Emergency Feedwater Pump a Tripped on Overspeed When Feeding Steam Generators.Cause Was Damaged Lead in Speed Control Unit ML19269C281
References
LER-78-030-03L, LER-78-30-3L, NUDOCS 7901310045
Download: ML19269C283 (1)

LER-1978-030, /03L-0 on 781227:in Mode 1 Operation,During Main Turbine Roll,Main Steam Relief Valves 2PSV1053 Lifted,Due to Steam Dump Valve Failures.Failed to Reseat,Causing Excessive RCS Cooldown

Event date:
Report date:
3681978030R03 - NRC Website

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NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION (7 77)

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EVENT o.TE 74 ib HE,OHI DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES O'o lo I2i l blode 1 operation, during blain Turbine roll, b!ain Steam relief valves j

I o i a l 1 2PSV1053 lifted, due to steam dump valve failures, and failed to reseat, i 1o1.;l causing excessive RCS cooldown (See also LER 50-368/78-29). The Reactor,

IoIsIi was manually tripped at 10F below the 5250F Tave as required by I

o a i T.S.3.1.1.5.

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