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Forwards revised LERs 86-001,86-006,86-008,86-009,86-010, 86-014,86-015,86-016,86-019,86-022,86-023,86-024,86-025, 86-026,87-003,87-006,87-007,87-008 & 87-009.

Accession Number: ML17055C966

Date Released: Thursday, June 29, 2017

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• ML17055C965 - Forwards revised LERs 86-001,86-006,86-008,86-009,86-010, 86-014,86-015,86-016,86-019,86-022,86-023,86-024,86-025, 86-026,87-003,87-006,87-007,87-008 & 87-009. (4 page(s), 7/7/1987)
• ML17055C968 - LER 86-001-01:on 861105,facility experienced 2 scrams during initial fuel loading.Caused by noise created when fuel bundle loaded adjacent to detector.Intermediate range monitor will be bypassed as permitted by Tech Spec 3.3.1. (6 page(s), 7/7/1987)
• ML17055C969 - LER 86-006-01:on 861112,discovered that surveillance requirements for fire-rated assemblies as defined by Tech Specs exceeded.Caused by personnel error.Fire dept patrol methods revised. (8 page(s), 7/7/1987)
• ML17055C971 - LER 86-008-02:on 861117,w/reactor at 0% power & mode switch in refuel,operators at facility suspended control rod testing.Caused by failure of contractors to follow procedures.Fire watch patrols established in affected zone. (8 page(s), 7/7/1987)
• ML17055C974 - LER 86-009-01:on 861124,single jumper fell off & shorted to ground causing reactor bldg ventilation exhaust damper 2HVR*AOD9B to close.Caused by difficulty in obtaining tight grip of jumper.Secure jumper installation method reviewed. (8 page(s), 7/7/1987)
• ML17055C975 - LER 86-010-02:on 861123,25% of control rods received full scram signal when all Group 2 control rod scram solenoid valves deenergized.Cause undetermined.Training mod request issued to train operators against recurrence. (8 page(s), 7/7/1987)
• ML17055C977 - LER 86-014-01:on 861203,facility experienced second scram to one quarter of control rods while recovering from scram & containment isolation.Caused by personnel error.Addl licensed operator training on reactor protection requested. (24 page(s), 7/7/1987)
• ML17055C978 - LER 86-015-01:on 861203,facility experienced scram due to loss of power to both reactor protection sys channels.Caused by circuit design allowing reactor protection sys,Channels A & B to become cross connected.Design change implemented. (12 page(s), 7/7/1987)
• ML17055C980 - LER 86-016-01:on 861207 & 08,standby gas treatment sys functional test performed causing filter train heaters to deenergize.Caused by deficiency in vendor design.Sensing points of 2GT*FS25 A(B) relocated to provide accurate flow. (10 page(s), 7/7/1987)
• ML17055C981 - LER 86-019-01:on 861215,reactor scram signal on scram discharge vol high level received following preplanned scram for post-maint testing.Caused by personnel error.Scram recovery procedure revised. (8 page(s), 7/7/1987)
• ML17055C982 - LER 86-022-01:on 861222,three standby diesel generators at facility declared inoperable as result of simultaneous draining of diesel generator day tank.Caused by procedural deficiency.Surveillance procedure N2-CSP-8 revised. (10 page(s), 7/7/1987)
• ML17055C983 - LER 86-023-01:on 861223,inoperable fire detector discovered in fire Zone 262SW.Caused by personnel error.Hourly fire watch patrol established in fire Zone 262SW. (8 page(s), 7/7/1987)
• ML17055C985 - LER 86-024-01:on 861231,w/facility in 0% power w/mode switch in shutdown,visible corrosion observed on Div I & II battery bus bars & terminals.Cause undetermined.Corrosion found on bus bars & terminals of emergency batteries removed. (8 page(s), 7/7/1987)
• ML17055C986 - LER 86-025-01:on 861231,automatic initiation of Div II standby gas treatment sys train occurred.Caused by component location design deficiency.Design change initiated to relocate differential pressure primary elements for div. (6 page(s), 7/7/1987)
• ML17055C988 - LER 86-026-01:on 861229,discovered that conduit seal inside manhole 5 did not meet internal flooding criteria.Caused by design deficiency.Manhole redesigned to meet internal flooding criteria. (10 page(s), 7/7/1987)
• ML17055C989 - LER 87-003-01:on 870116,single jumper fell off & shorted to ground causing reactor bldg ventilation exhaust damper to close.Caused by difficulty in obtaining tight grip. Stake-ons will be installed on terminal blocks. (8 page(s), 7/7/1987)
• ML17055C991 - LER 87-006-01:on 870202,MSIV closed on isolation signal. Caused by procedure deficiency & equipment deficiency due to temporary circuit configuration.Surveillance procedure will be revised prior to next use to include checks. (8 page(s), 7/7/1987)
• ML17055C992 - LER 87-007-01:on 870202,secondary containment isolation & subsequent standby gas treatment sys & emergency recirculation sys initiation occurred.Caused by personnel error.Personnel trained to exercise proper care. (6 page(s), 7/7/1987)
• ML17055C994 - LER 87-008-01:on 870127,limiting condition for operation as defined by Tech Spec 3.7.7.3 violated during routine markup of carbon dioxide fire suppression sys.Caused by miscommunication.Continuous fire watch patrol established. (8 page(s), 7/7/1987)
• ML17055C995 - LER 87-009-01:on 870126,full isolation occurred when both stop valves SV-3 & SV-4 limit switches calibr.Caused by procedural deficiency in instrument surveillance procedure. Procedural steps added to N2-ISP-RPS-R102. (8 page(s), 7/7/1987)