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Forwards four LERs re maladjustment in Number 12 diesel generator fast start control,improper setting on APRM time delay relay,TIP ball failure to close & RCIC steam control valve stuck closed,respectively.

Accession Number: ML20058L017

Date Released: Thursday, March 12, 2020

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• ML20058L013 - Forwards four LERs re maladjustment in Number 12 diesel generator fast start control,improper setting on APRM time delay relay,TIP ball failure to close & RCIC steam control valve stuck closed,respectively. (1 page(s), 11/26/1975)
• ML20058L029 - LER.On 751116,during test,Number 12 diesel generator tripped on overspeed during fast start.Caused by maladjusted cam operated switch in fast start control circuitry.Adjustment made. (1 page(s), 11/26/1975)
• ML20058L031 - LER.On 751116,auto blow down delay relay for "A" logic channel failed to energize in required time interval.Time delay reset per Tech Specs. (1 page(s), 11/26/1975)
• ML20058L034 - LER.On 751117,while preparing for containment leak testing, Number 3 TIP ball valve failed to close completely.Caused by stuck wiper on wafer-type limit switch.Valve replaced. (1 page(s), 11/26/1975)
• ML20058L045 - LER.On 751118,during test,RCIC turbine failed to start when given fast start.Caused by valve binding due to corrosion products & crud on valve stem & pivots.Stem & pivots polished & lubricated. (1 page(s), 11/26/1975)