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Forwards LERs 88-024-00,88-025-00,87-067-01,87-070-01 & 88-006-01.

Accession Number: ML20151B602

Date Released: Saturday, June 13, 2020

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• ML20151B598 - Forwards LERs 88-024-00,88-025-00,87-067-01,87-070-01 & 88-006-01. (1 page(s), 7/15/1988)
• ML20151B717 - LER 87-067-01:on 870926,identified that primary containment leakage rate through main steam line B isolation valves, as defined by Tech Spec 3.6.1.2,exceeded.Caused by improper installation of plate set screw.Review conducted. (4 page(s), 7/15/1988)
• ML20151B723 - LER 87-070-01:on 871024,loss of reactor protection sys bus occurred due to trip on overvoltage condition.Root cause indeterminate.Potential cause of event isolated to voltage regulator &/or rheostat.Regulator & rheostat replaced. (3 page(s), 7/15/1988)
• ML20151B728 - LER 88-006-01:on 880119,reactor protection sys (RPS) B motor generator set output circuit breaker tripped open on overvoltage,resulting in Div II balance-of-plant isolation. Caused by small random disturbances in RPS bus voltage. (3 page(s), 7/15/1988)
• ML20151B733 - LER 88-025-00:on 880618,overtravel of reactor protection sys (RPS) power transfer switch occurred,resulting in loss of power to both busses & full RPS actuation.Caused by personnel error.Info tag installed & design change planned. (3 page(s), 7/15/1988)
• ML20151B735 - LER 88-024-00:on 880616,spurious spike in recirculation flow demand caused increased core flow resulting in upscale neutron flux trip & subsequent reactor scram.Caused by reinsertion of automatic flux control card. (3 page(s), 7/15/1988)