05000316/LER-1979-012-03, /03L-0 on 790330:hydraulic Control Values Did Not Return to Normal Position Placing Hydraulic Lock on Operator Cylinder.Caused by Dirt in Hydraulic Pilot Valve.Hydraulic Fluid Replaced

/03L-0 on 790330:hydraulic Control Values Did Not Return to Normal Position Placing Hydraulic Lock on Operator Cylinder.Caused by Dirt in Hydraulic Pilot Valve.Hydraulic Fluid Replaced

ML17317B153
Person / Time
Site:	Cook
Issue date:	04/27/1979
From:	Michael Brown INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B152	List: 05000316/LER-1979-012, Forwards LER 79-012/03L-0 05000316/LER-1979-012-03, /03L-0 on 790330:hydraulic Control Values Did Not Return to Normal Position Placing Hydraulic Lock on Operator Cylinder.Caused by Dirt in Hydraulic Pilot Valve.Hydraulic Fluid Replaced
References
LER-79-012-03L-01, LER-79-12-3L-1, NUDOCS 7905040002
Download: ML17317B153 (6)

LER-1979-012, /03L-0 on 790330:hydraulic Control Values Did Not Return to Normal Position Placing Hydraulic Lock on Operator Cylinder.Caused by Dirt in Hydraulic Pilot Valve.Hydraulic Fluid Replaced

Event date:
Report date:
3161979012R03 - NRC Website

text

NRC FORM 366 I7-77)

CONTROL BLOCK:

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9 LICENSEE CODE U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT Q1 (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 6

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THIS CONSTITUTED AN INOPERABLE STEAM STOP VALVE DELINEATED IN TECH.

SPEC.

3.7. 1.5.

THE VALVE WAS INOPERABLE FOR APPROXIMATELY ONE INCUR;'O PREVIOUS EVENTS.

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THE CAUSE OF THE PILOT VALVE STICKING ISTHOUGHTi TO HAVE BEEN DIRT.

THE HYDRAULIC FLUID HAS BEEN REPINED.

NO FUTURE ACTIONS ARE PLANNED.

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THE CAUSE OF THF PILOT VALVE STICKING ISTHOUGHT TO HAVE BEEN DIRT.

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1 1 ps~ps 14 15 LICENSE NUMBER 26 LICENSE TYPE 30 57 CAT 58 CONTROL VALVES DID NOT RETURN TO THEIR NORI%L POSITIONS PLACING A HYDRAULIC LOCK ON THE OPERATOR CYLINDER.

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SPEC.

3.7. 1.5.

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THE BYPASS VALVE TO HYDRAULICALLYLOCK THE t%IN VALVE OPERATING CYLINDER.

THE CAUSE OF THE PILOT VALVE STICKING ISTHOUGHT TO HAVE BEEN DIRT.

THE HYDRAULIC FLUID HAS BEEN REPLACED.

NO FUTURE ACTIONS ARE PLANNED.

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Qs 7

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10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ35 s

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