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Forwards LERs from 1987,per discussions w/T Ross re repts missing from document control desk.

Accession Number: ML20196G596

Date Released: Tuesday, July 28, 2020

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• ML20196G592 - Forwards LERs from 1987,per discussions w/T Ross re repts missing from document control desk. (1 page(s), 3/4/1988)
• ML20196G602 - LER 87-030-00:on 871219,ATWS instrument sensing lines inadequately supported & did not meet FSAR design criteria. Caused by cognitive personnel error & inadequate design. Temporary supports installed.W/880113 ltr. (9 page(s), 1/12/1988)
• ML20196G617 - LER 87-029-00:on 871207,Bus 13-1 degraded voltage 5 minute time delay relay found out of tolerance.Caused by setpoint drift.Time delay relay recalibrated & tested.W/871224 ltr. (6 page(s), 12/22/1987)
• ML20196G622 - LER 87-028-00:on 871202,open penetrations found through fire barriers.Caused by personnel errors.Identified deficiencies repaired & station Maint Work Request Procedure QAP 1500-2 & Checklist QAP 1500-S1 revised.W/871229 ltr. (11 page(s), 12/29/1987)
• ML20196G628 - LER 87-024-00:on 871120,primary containment structural steel connections outside FSAR design criteria discovered.Caused by const error.Engineering Change Notices QC-87S-24 & 27 issued & repairs made.W/871216 ltr. (6 page(s), 12/16/1987)
• ML20196G634 - LER 87-021-00:on 871110,diesel fire pump 1/2A inoperable & on 871111 7-day out-of-svc reporting criteria exceeded. Caused by pump intake bay being empty for circulating water pump maint.Intake bay refilled on 871117.W/871207 ltr. (6 page(s), 12/7/1987)
• ML20196G645 - LER 87-017-00:on 870805,HPCI sys inoperable due to invalid sys isolation.Caused by HPCI steamline differential pressure transmitter failure.Transmitter failure under investigation. Rosemount Model 1153DB5PA switch replaced.W/870831 ltr. (5 page(s), 8/31/1987)
• ML20196G652 - LER 87-020-00:on 871006,refuel floor radiation monitor sys ESF actuation occurred.Caused by installation deficiency. Event discussed w/electrical maint personnel & relay in Panels 901(2)-40 & 41 replaced.W/871103 ltr. (6 page(s), 11/3/1987)
• ML20196G665 - LER 87-014-00:on 870729,control room ventilation isolation occurred.Caused by chlorine analyzer sys spike resulting from power fluctuation during electrical storm.Control room ventilation sys returned to normal.W/870812 ltr. (6 page(s), 8/10/1987)
• ML20196G685 - LER 87-013-00:on 870629,control room HVAC sys isolation occurred.Caused by defective functional test procedure or probe corrosion.Chlorine in probe vicinity removed & corroded probe replaced.W/870715 ltr. (8 page(s), 7/20/1987)
• ML20196G694 - LER 87-012-00:on 870624,reactor bldg & control room ventilation sys isolation occurred.Caused by relay coil failure.Relay coil replaced & tested & Mod M-4-1(2)-85-17 to replace similar relays initiated.W/870716 ltr. (6 page(s), 7/16/1987)
• ML20196G700 - LER 87-010-00:on 870519,control room ventilation actuated due to toxic gas analyzer failure.Caused by design deficiency.NRC not notified due to miscommunication.Gas analyzer power restored & personnel counseled.W/870610 ltr. (7 page(s), 6/10/1987)
• ML20196G708 - LER 87-007-00:on 870414,diesel fire pump 1/2 B inoperable & exceeded 7-day out-of-svc reporting criteria.Caused by design deficiency.Deficiency repaired,surveillance procedures revised & voltage drop reviewed.W/870430 ltr. (7 page(s), 4/30/1987)
• ML20196G716 - LER 87-006-00:on 870403,HPCI sys inoperable.Caused by loose soldered connection on solenoid valve coil SV-8.Solenoid coil replaced & HPCI turbine remote reset verified.Solenoid valves SV-8 & SV-12 replacement planned.W/870424 ltr. (6 page(s), 4/24/1987)
• ML20196G731 - LER 87-005-00:on 870317,turbine trip & reactor scram occurred.Caused by level control valves (LCV) being out of adjustment,stuck valve failure & inadequate planning.Program to track LCV setpoint changes developed.W/870407 ltr. (6 page(s), 4/7/1987)