ML19309F134

LER 80-013/03L-0:on 800320,while Moving Group 7 Control Element Assemblies for Axial Shape Index Control,Assembly 1 Dropped Into Fully Inserted Position.Caused by Failure of Timer Module in Coil Power Programmer.Timer Replaced

ML19309F134
Person / Time
Site:	Millstone
Issue date:	04/18/1980
From:	Bates R NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309F132	List: ML19309F131 ML19309F134
References
LER-80-013-03L, LER-80-13-3L, NUDOCS 8004280530
Download: ML19309F134 (1)

Text

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LICENSEE EVENT REPORT CON Trol BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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REPORT DATE

~ EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h a 2 i While moving group 7 Control Element Assemblies (CEA) for axial shape index control . I io g3; i CEA No.1 dropped to the fully inserted position. In accordance with Technical' I o ,, l Specifications Section 3.1.3.1, action e, thermal power was reduced to 70% within i 1 T T iog3; i 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and operation continued. Values for Tq, Fr and FX Y were monitored but I a s i no limits were exceeded. The cause of the dropped CEA was corrected and CEA No.1 l

o y,; ; was realigned with other group 7 CEA's within 30 minutes of reaching 70% power. I 1

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O I The cause of the dropped CEA was failure of the timer module in the coil power l l

li g i l l programmer for CEA No.1. The failed timer module was replaced and nomal operation I

, , _i continued. The timer module is made by Electro Mechanics, Model E3097. I l

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