05000293/LER-1979-003-03, /03L-0 on 790114:during Control Rod Exercise Surveillance,Control Rod 30-15 Would Not Respond to Insert Signal.Caused by Slight Indentations on Teflon Discs of All Four Directional Control Valve Moveable Cores

/03L-0 on 790114:during Control Rod Exercise Surveillance,Control Rod 30-15 Would Not Respond to Insert Signal.Caused by Slight Indentations on Teflon Discs of All Four Directional Control Valve Moveable Cores

ML19269C886
Person / Time
Site:	Pilgrim
Issue date:	02/12/1979
From:	Mathis C BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269C885	List: 05000293/LER-1979-003, Forwards LER 79-003/03L-0 05000293/LER-1979-003-03, /03L-0 on 790114:during Control Rod Exercise Surveillance,Control Rod 30-15 Would Not Respond to Insert Signal.Caused by Slight Indentations on Teflon Discs of All Four Directional Control Valve Moveable Cores
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7902200036
Download: ML19269C886 (1)

LER-1979-003, /03L-0 on 790114:during Control Rod Exercise Surveillance,Control Rod 30-15 Would Not Respond to Insert Signal.Caused by Slight Indentations on Teflon Discs of All Four Directional Control Valve Moveable Cores

Event date:
Report date:
2931979003R03 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 DOCK ET NUMBE R bd 63 EVENT DATE I4 75 PEPORT DAT E 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l On January 14, 1979, while performing control. rod exercise surveillance 8.1.2, con-o 3 l trol rod 30-15 would not respond to an insert signal. Technical Specification l

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l 3.3.A.2.a requires that control rods must have the ability to be moved with control j o., l rod drive pressure. The CRD was declared inoperable and isolated for repairs. No

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lo is l l other drives were inoperable therefore, shutdown capability was maintained.

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33 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l Investigation revealed slight indentations on the teflon discs of all four 3

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,,,,, l directional control valve moveable cores. The cores were replaced in kind and CRD l

,, g ; 30-15 exercised satisfactorily, verifying that control rod drive collet housing g,g3; l failure had not occurred.

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