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Forwards listed LERs,updating original repts for corrective actions deferred due to State of NY - LILCO Shoreham Settlement Agreement.

Accession Number: ML20055C491

Date Released: Monday, March 9, 2020

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• ML20055C490 - Forwards listed LERs,updating original repts for corrective actions deferred due to State of NY - LILCO Shoreham Settlement Agreement. (2 page(s), 5/16/1990)
• ML20055C492 - LER 85-059-01:on 851219,half reactor trip,full NSSS shutoff sys isolation & reactor bldg standby ventilation sys initiation occurred due to loss of power to reactor protection sys bus B.Assembly breaker reset. (3 page(s), 5/16/1990)
• ML20055C493 - LER 86-014-01:on 860305,full reactor trip occurred due to momentary false low vessel level signal,causing hydraulic pressure spike in ref leg A.Bourton tube type pressure transmitter replaced w/Rosemount Model 1153. (3 page(s), 5/16/1990)
• ML20055C494 - LER 86-032-01:on 860728,RWCU isolated on high differential flow sensed by steam leak detection sys while placing filter demineralizers in operation.Cause not determined. Operating procedures revised to monitor RWCU sys. (4 page(s), 5/16/1990)
• ML20055C495 - LER 86-039-01:on 861006,unplanned initiation of reactor bldg standby ventilation sys occurred w/all rods inserted in core.Caused by faulty design of retaining device.Warning signs attached to valve actuator & valve mod initiated. (3 page(s), 5/16/1990)
• ML20055C496 - LER 87-009-01:on 870203,full reactor trip occurred due to perturbation in ref leg.Caused by spurious low level reactor pressure vessel water level signal.Existing level & pressure transmitters replaced w/newer models. (4 page(s), 5/16/1990)
• ML20055C497 - LER 87-012-01:on 870504,uplanned actuation of ESF occurred. Caused by technician loosing footing & accidently hitting outside cover of level switch.Permanent ladders & platforms installed at head tank level switches. (4 page(s), 5/16/1990)
• ML20055C498 - LER 87-021-01:on 870715,design defects detected in HVAC sys, including missing fire dampers on HVAC penetrations of fire barriers during review of NRC Info Notice 83-69.Fire watch patrols instituted & deluge water curtain sys installed. (5 page(s), 5/16/1990)
• ML20055C499 - LER 87-022-01:on 870604,HPCI test valve to condensate storage tank,globe valve & HPCI/RCIC test valve to condensate storage tank failed to close against sys operating pressure.Disc of motor-operated valve 37 modified. (3 page(s), 5/16/1990)
• ML20055C500 - LER 87-026-01:on 870807,loss of normal station svc transformer occurred due to personnel error while performing relay calibr,causing blocking of fast transfer of emergency buses.Agastat relays removed from transformer. (5 page(s), 5/16/1990)
• ML20055C501 - LER 87-035-02:on 871221,880106 & 0330,high energy line break logic isolations of RWCU & main steam line drain valves occurred.Caused by problems w/temp monitoring units. Grounding scheme changed & transformers rewired. (4 page(s), 5/16/1990)
• ML20055C502 - LER 88-003-01:on 880322,unplanned automatic initiation of reactor bldg standby ventilation sys side A occurred during deenergization of relay.Caused by close placement of relay terminals.Wiring inside electrical panels reworked. (3 page(s), 5/16/1990)
• ML20055C503 - LER 88-015-02:on 880916,seismic monitoring instrumentation, including peak acceleration recorders,removed from svc for more than 30 days due to corrosion on scratch plates.Cover gasket replaced & thermal barrier mount to be installed. (3 page(s), 5/16/1990)
• ML20055C504 - LER 88-017-01:on 881025,discovered that seismic monitoring instrumentation returned to svc prior to verifying sys operability & special rept not written.Caused by personnel error.Surveillance engineer reassigned. (4 page(s), 5/16/1990)
• ML20055C506 - LER 88-019-01:on 881106,reactor bldg closed loop cooling water split occurred while placing main HX in svc.Caused by low water level in head tank A & lack of vent near inlet valve.Vent valves installed & booster HXs modified. (6 page(s), 5/16/1990)
• ML20055C507 - LER 89-003-01:on 890310,emergency diesel generator (EDG) 102 manually shutdown during 18-month surveillance test due to failure of EDG output breaker.Cause not determined. Replacement breaker installed in cubicle 102-8. (3 page(s), 5/16/1990)
• ML20055C508 - LER 89-005-01:on 890321,results of local leak rate test of core spray suction valve A determined that leakage,when combined w/all Type B & C penetration leakages,exceeded Tech Spec limit.Caused by normal valve degradation. (3 page(s), 5/16/1990)
• ML20055C509 - LER 89-006-01:on 890707,hydraulic transient inadverently initiated on common process leg for reactor pressure vessel B instrument rack,resulting in loss of shutdown cooling & full reactor trip.Analog trip alarms reset. (5 page(s), 5/16/1990)
• ML20055C510 - LER 88-016-01:on 881011,large fluctuations in sys voltage caused unplanned actuation of ESF & valve movement in three other ESF sys.Caused by loose shield wire resulting in shorting of 69 kV lines.Power supply changed. (5 page(s), 5/16/1990)
• ML20055C511 - LER 89-008-01:on 891016,control room alarms received indicating that fire pump started & deluge valve opened & pipe break occurred at Elevation 8 ft of reactor bldg.Caused by attempted sabotage/tampering.Procedures changed. (5 page(s), 5/16/1990)