05000267/LER-1982-035, Forwards LER 82-035/03L-0.Detailed Event Analysis Encl
05000395/LER-1982-014, Forwards LER 82-014/03L-0.Detailed Event Analysis Encl
NL-20-012, Application to Revise Provisional Operating License and Technical Specifications
RBG-26223, Provides Clarification to Description Portion of Util 870310 Attachment 4 Submittal.Five Valves Identified for Tech Spec Section 4.6.1.3.d Require Exemption for 10CFR50,App J Criteria
RBG-25917, Application for Amend to License NPF-47,extending Surveillance Interval to First Refueling Outage Scheduled to Begin on 870915.Fee Paid
ELV-03718, Submits Revised Application for Amend to Licenses NPF-68 & NPF-81,per 920421 Telcon W/Nrc,Revising TS 3/4.6.1.7 & 4.6.1.2f.Rev Includes Clarification of Leakage Limit & Deletion of Proposed Option Re Containment Purge Supply
JPN-91-063, Forwards Application for Amend to License DPR-59,consisting of Guidance Provided in Generic Ltr 90-09, Alternative Requirements for Snubber Visual Insp Intervals & Corrective Actions
TXX-4282, Requests Exemption from Section III.D.2.b.ii of App J to 10CFR50 Requiring Leakage Testing of Airlock.Overall Airlock Leakage Rate Will Be Measured Every 6 Months Regardless of Airlock Operating or Maint History
05000369/LER-1989-021-01, :on 890623,discovered That Design of Sys Did Not Take Into Account temp-induced Difference in Pressure Gradients Inside & Outside Annulus.Caused by Design Deficiency.Sys Setpoint Mods Implemented
05000245/LER-1989-007-01, :on 890411,visual Insp Revealed That One Hydraulic Snubber Had No Visible Signs of Fluid in Reservoir.Caused by Piston O-ring Displaced from Retainer During Testing.Snubber Rebuilt & Reinstalled
05000370/LER-1987-010-03, :on 870731,electrical Personnel Discovered Deficiency in Connections of Equipment Being Replaced.Caused by Design Deficiency.Manual Leak Rate Tests Conducted as Necessary to Satisfy Tech Specs
05000455/LER-1987-014-06, :on 870824,primary Containment Type B Local Leakage Rate Tests of Equipment Hatch Airlock Door Gasket Interspaces Not Performed,Making Airlock Inoperable.Caused by Personnel Error.Surveillance Performed
05000323/LER-1985-026, :on 850507 & 860210,Mode 6 Entered W/O Performing Required Surveillance Test & Discovered That Test Line Not Included in Procedures,Respectively.Caused by Inadequate Procedure Review
05000414/LER-1986-024-01, :on 860605,discovered That Periodic Test of Nonautomatic Containment Isolation Valves Performed W/ Incomplete Valve Checklist on 860411 & 0511.Caused by Defective Procedure.Procedures Revised
05000250/LER-1986-004, :on 860125,presence of Debris in Emergency Containment Coolers Discovered.Caused by Past Performance of Maint Procedure 4707.2 During Steam Generator Repair Outages.Debris Removed.Maint Procedure Revised
05000323/LER-1985-026-01, :on 850507,plant Entered Mode 6 for First Time W/O Performing Tech Spec Requirement 4.9.4 for Spare Instrument Test Line.Caused by Inadequate Procedure. Procedure Revised
05000413/LER-1986-016, :on 860317,surveillance Time Interval for Penetration Bellows Integrity Test Exceeded.Caused by Misunderstanding of Applicability of Grace Period & Human Error.Procedures Corrected
05000443/LER-1992-022, :on 921110,determined That Containment Personnel Hatch Airlock Seal Leakage Surveillance Not Performed at TS-required Frequencies.Caused by Lack of Administrative Mechanism.Package Generated
05000369/LER-1985-010-01, :on 850320,keyswitch for Door on Reactor Side of Containment Personnel Airlock in Bypass Position.Caused by Procedural Deficiency.Procedures Will Be Changed to Ensure Switches Returned to Active Position
05000382/LER-1985-009, :on 850320,containment Airlock Door Seal Leakage Test Not Performed within Time Frame Specified by Tech Specs.Cause Not Stated.Surveillance Performed. Containment Entry Times Posted
05000413/LER-1992-007-01, :on 920703,discovered That Previous 72 H Leak Rate Test Had Not Been Performed on Air Lock Per Ts.Caused by Lack of Communication.Operations Support Group Trained Re Communications of Turnover Responsibility
05000366/LER-1992-001, :on 920109,errors in Plant Drawing & FSAR Result in Missed TS Surveillances.Caused by Errors in Plant Drawing.Leak Rate Test of Penetration Performed,Procedures Revised & Penetrations Modified
05000369/LER-1991-005, :on 910515,both Trains of Annulus Ventilation Sys Were Inoperable Due to Inappropriate Action.Caused by Mgt Deficiencies & Deficient Communication.No Personnel Injuries or Radiation Overexposures Noted
05000267/LER-1983-039-03, /03L-0:on 830929,w/reactor Operating at 65% Power, Problems Experienced W/Diesel Generator 1B Set During Performance of Weekly Surveillance Test.Caused by Failed Engine Trip Circuit Due to heat-brittlement of Insulation
05000267/LER-1983-041-03, /03L-0:on 831005,emergency Diesel Engine 1D of Emergency Generator Set 1B Taken Out of Svc to Repair Air Leak in Filter.Caused by Blown Out Petcock Drain in Filter.Polycarbonate Bowl Replaced & Tested
05000369/LER-1983-115-03, /03L-0:on 831129,annulus Ventilation Train a Unable to Meet Required Vacuum Decay Time & Declared Inoperable.Caused by Poor Sealing on Annulus Doors.Seals Replaced,Shimmed & Adjusted
05000369/LER-1991-005-03, :on 910515,both Trains of Annulus Ventilation Sys Declared Inoperable Due to Inappropriate Action.Caused by Mgt Deficiencies & Deficient Communication.Meeting Held Between Mnt Paint Craft Personnel
05000336/LER-1994-028-01, :on 940923,TS Surveillance Not Performed within Required Time Interval Due to Assuming That 24 Month LLRT Began After LLRTs Completed from Current Refuel Outage.Past LLRT Surveillance Intervals Reviewed
05000423/LER-1994-013-02, :on 940916,determined That Previous Plant start-ups Conducted W/Several Operability Tests Not Performed Prior to Entry Into Modes 4 & 3.Caused by Misinterpretation of Inconsistency in TS
05000369/LER-1983-020-01, /01T-0:on 830503,soap Bubble Test of 47 Secondary Containment Bypass Leakage Paths Not Performed During Initial Integrated Leak Rate Test.Caused by Procedural Deficiency.Procedures Revised
05000370/LER-1983-007-01, /01T-0:on 830503,during Tech Spec Review,Soap Bubble Test of 47 Secondary Containment Bypass Leakage Paths Discovered Not Performed.Caused by Procedural Deficiency. Temporary Test Procedure Written
05000366/LER-1991-018, :on 910604,error Found in FSAR Results in Missed Tech Spec Surveillances.Caused by Error in Fsar. Local Leak Rate Penetration Test Performed & Applicable Surveillance Procedures Revised
05000443/LER-1994-014, :on 940724,discovered That Containment Equipment Hatch Air Lock Seal Leakage Surveillance Had Not Been Performed as Required by Ts.Caused by Inadequate Tracking Mechanism.Revised Lock Surveillance
05000324/LER-1982-095-03, /03L-0:on 820903,discovered That Most Recent ILRT Exceeded Specified Testing Interval.Caused by Improper Scheduling.Scheduling Program Revised to Reflect Correct Scheduling Criteria
05000325/LER-1982-103-03, /03L-0:on 820924,required Semiannual Functional Test of Primary Containment Air Lock Interlock Mechanism Not Addressed in Procedures.Caused by Personnel Oversight During Initial Review of Tech Specs
05000267/LER-1982-035-03, /03L-0:on 820827,engine 1B of Standby Generator Set 1A Rendered Inoperable.Caused by Indicator Lamp &/Or Lamp Socket Short Circuiting,Causing 15 Amp Fuse to Blow in Engine 1B,125-volt Dc Cranking Circuit
05000325/LER-1982-072-03, /03L-0:on 820630,while Investigating Cause of Reactor Scram,Discovered Tech Spec-required Surveillance of Emergency Bus Degraded Voltage & Undervoltage Relays Not Performed.Caused by Personnel Error.Review in Progress
05000267/LER-1978-029-03, /03L-0:on 780829,during Routine Check,Emergency Diesel Oil Day Tank Found Below 500 Gallon Level.Caused by Fuel Oil Transfer Pump Not Starting Until 350 Gallon Level Reached
RBG-39426, Requests Exemption from 2-yr Test Interval for Type C Leak Rate Test Required by 10CFR50,App J,Section III.D.3,per 10CFR50.12(a).Discussion of Exemption & Justification Encl
05000267/LER-1981-066-03, /03L-0:on 811020,during Plant Startup,Emergency Diesel Generator Set Taken Out of Svc W/O Previously Verifying Other Diesel Generator Set Operable.Caused by Misinterpretation of LCO 4.6.1(d)
05000267/LER-1981-053, Forwards LER 81-053/03L-0.Detailed Event Analysis Encl
05000267/LER-1981-058-03, /03L-0:on 810911,station Battery Taken Out of Svc for Overcharging While Diesel Generator Was Under Repair. Caused by Operator Error.Battery Taken Off Overcharge & Returned to Svc
05000267/LER-1981-057, Forwards LER 81-057/03L-0.Detailed Event Analysis Encl
05000458/LER-1989-040, :on 891117,surveillance Test of Div II Penetration Valve Leakage Control Sys Air Supply Header Pressure Not Performed within Allowable Tolerance.Addl Training of Scheduling Group Will Be Provided
LR-N18-0028, Submittal of Emergency Plan Document Revision Implemented December 6, 2017 and January 30, 2018
05000456/LER-1990-002-03, :on 900119,discovered That Flanges Not Added to Procedure 1BwOS, Primary Containment Integrity Verification of Outside Containment Isolation Devices. Caused by Program Weakness.Training Held
05000267/LER-1980-060-03, /03L-0:on 801010,plant Protective Sys Battery Charger/Inverter Tripped.Caused by Noise Spike Exceeding Inverter High Voltage Trip Level.Trip Level Is Too Sensitive to Noise.Modified Trip Circuit Will Be Installed
05000346/LER-1980-074-03, /03L-0:on 801008,test Frequency for Containment Air Lock Test Exceeded.Caused by Procedural Deficiency.Mods to Plant Procedures Made to Provide Assurance of Completing Required Testing
05000346/LER-1978-082-03, /03L-0:on 780722,surveillance Testing on Personnel Airlock Not Performed within Required 72-h.Caused by Procedure Scheduling Deficiency.Test Not Adaptable to 7-day Schedule.Airlock Tested as Required
05000267/LER-1980-010-03, /03L-0:on 800303,at 10% Thermal Power,A Emergency Diesel Generator Would Not Load as Required for Weekly 50% Load Test Surveillance.Caused by Diesel Generator Governor Problem Which Reduced Speed Control Response
05000267/LER-1979-020-03, /03L-0 on 790717:during Normal Plant Operation, Engine Failed to Start.Caused by Failure of Emergency Diesel Temp Switch C.Switch Replaced
05000267/LER-1978-036-03, /03L-0 on 781129:1 of 2 Engines Which Drive a Single Emergency Generator Failed to Start & Failed to Declutch from Generator After Failing to Start.No Cause Identified.Subsequent Tests Unable to Repeat Failure
05000366/LER-1979-019-03, /03L-0 on 790201:innerdoor Seal & Shaft Seal Found to Be Leaking.Caused by Crack on Inner Lip of Seal,Which Was Replaced.Shaft Seal Was Dry When Removed.Seal Cleaned, Lubricated & Reinstalled to Satisfaction
05000267/LER-1979-048-03, /03L-0:on 791011,station Battery Set B Was Removed from Svc for Repair of Faulty Cell.Unit Operated in Degraded Mode for 24-h.Caused by Discovery of Cell W/Low Specific Gravity.Cell Repaired by Manufacturer
SBK-L-18027, 9 - Response to Final Requests for Additional Information for the Safety Review of the Seabrook Station License Renewal Application - 10 CFR 50 Appendix J Program
05000400/LER-1996-011, :on 960629,failed to Perform Surveillance of Containment Isolation Valves.Caused by Incorrect Interpretation of TS Surveillance Requirements.Issued Operations Re TS 4.6.1.1
L-93-241, Application for Amend to Licenses DPR-31 & DPR-41 Revising Surveillance Requirement 4.6.1.2a & Associated Bases to Conform w/NUREG-1431,Standard Ts,Westinghouse Plants,Rev 0
05000315/LER-1998-043, :on 980910,determined That Containment Air Locks Testing Had Not Been Performed IAW TS 4.6.1.3.a.Caused by Personnel Error.Plant Procedures Will Be Revised to Include Addl Steps Re Air Lock Test Results.With
05000397/LER-1992-002, :on 920113,determined That MSIV Leakage Control Sys Fan Testing Incorrectly Performed.On 920127, Determined That Setpoint for Pressure Switch Did Not Ensure Proper Sys Operation.Ts Waiver Obtained
05000397/LER-1991-013, :on 910507,non-compliances W/Tech Specs Identified as Part of Program of Surveillance Procedure Verification.Further Evaluation Performed.Quality Action Team to Be Chartered to Evaluate Program
05000244/LER-1993-005, :on 931011,due to Misinterpretation of TS 4.6.1.e.3.(a) Requirements,Verification of Load Shedding Capability of Safeguards Loads Not Adequately Performed. Testing Completed to Verify Capability
05000206/LER-1991-006, :on 910221,failure to Perform Radioactive Gaseous Effluents Discovered.Caused by Inadequate Communication.Review of Ongoing Activities During turn-over Process & Shift turn-over Process Enhanced
05000206/LER-1989-027, :on 891130,particulate Sample for Wk of 891017-24 Could Not Be Found in Designated Storage Location. Caused by Inadequate Administrative Controls.Event Reviewed W/Chemistry Technician Involved
05000237/LER-1984-022, :on 841205,three Main Steam Line Snubbers Failed Functional Test.Caused by condensation-induced Water Hammer in Main Steam Lines While Performing Reactor Vessel Fast Flood Procedure Dgp 2-2.Procedure Deleted