05000293/LER-2010-002, For Pilgrim Nuclear Power Station, Regarding Standby Gas Treatment Declared Inoperable After Discovery of Open Demister Door
BVY 14-037, Technical Specifications Proposed Change No. 309, Defueled Technical Specifications and Revised License Conditions for Permanently Defueled Condition - Supplement 2
BVY 14-036, Response to Request for Additional Information on Technical Specifications Proposed Change No. 306, Eliminate Certain ESF Requirements During Movement of Irradiated Fuel - Supplement 1
BVY 12-084, License Amendment Request; Changes to 10CFR50.63 Licensing Basis
NL-09-1676, Request to Revise Technical Specification 3.7.8, Service Water System (Sws)
BVY 08-084, Technical Specifications Proposed Change No. 273, Supplement 5, Response to Request for Additional Information
L-MT-05-013, Additional Technical Specification Changes for the Monticello Nuclear Generating Plant Regarding Application of Alternative Source Term (AST) Methodology to Re-Evaluate the Fuel-Handling Accident
05000280/LER-2078-009-03, L Re Snubber Body in Contact with Structure; LER 1978-009-03L Re Trip of Boric Acid Transfer Pump; & LER 1978-010-03L Re Failure of Pressurizer Channel
NL-03-002, Response to Request for Additional Information Regarding Section 3.8.1, AC Sources Operating, of Improved TS
05000219/LER-1982-047, Forwards LER 82-047/03L-0.Detailed Event Analysis Encl
NG-97-1433, Forwards Response to Violations Noted in Insp Rept 50-331/97-11.Corrective Actions:Turbine Stop Valve Testing Subsequently Completed During Plant Shutdown to Repair Failed MSIV Limit Switch
NG-98-0458, Responds to Violations Noted in Insp Rept 50-331/98-02. Corrective Actions:Revised Applicable Plant Procedures Re Valves in Violation & Submitted TS Rev Which Will Provide Longer LCO for Drywell Cooling Return & Supply Valves
BECO-87-015, Requests Emergency Relief from Tech Spec 4.7.B.2.a Re Control Room High Efficiency Air Filtration Sys While 870119 Tech Spec Change Request Being Processed.Relief Required by 870131 to Support off-loading at Facility
BECO-87-036, Requests Continued Review & Approval of 870119 Application to Change Tech Spec 4.7.B.2.a Re Reduction of Differential Pressure from 8 to 6 Inches in Control Room High Efficiency Air Filtration Sys,Per NRC .Related Info Encl
B17621, Application for Amend to License DPR-21,reflecting Permanently Defueled Condition of Unit 1,Tech Specs Administrative Controls Section as Allowed by Guidance Contained in NRC Administrative Ltr 95-06
NG-98-0016, Application for Amend to License DPR-49,revising LCO for PCIVs in TS Section 3.7.B to Allow 72 Hours to Isolate Failed Valve Associated W/Closed Sys,Per NUREG-1433
B16433, Provides Clarification of Certain Minor Discrepancies Contained in Supporting NRC Safety Evaluation to Amend 98 of License DPR-21
BECO-85-146, Application for Amend to License DPR-35,consisting of Proposed Change 85-09,revising Tech Specs Re Standby Gas Treatment Sys & Control Room High Efficiency Air Filtration Sys.Changes Modify 840809 Submittal
BVY-99-132, TS Proposed Change 227 to License DPR-28,revising Activated Charcoal Testing Methodology IAW Guidance Provided in GL 99-02
CY-96-093, FOIA Request for Documents Re Most Recent Plant Issues List for Plant,As Described in SECY-96-093
BECO-92-116, Application for Amend to License DPR-35,consisting of Temporary Change to TS Sections 3.7.B.1.C,3.7.B.1.e, 3.7.B.2.a & 3.7.B.2.C,requiring Both Trains of SGTS to Be Operable During Irradiated Fuel Handling Operations
BVY-94-105, Proposed Change 177 to License DPR-28,replacing TS 3.7.B, Pages 152,153 & 154 Re Standby Gas Treatment Power Supply Requirements During Refueling Operations
NG-94-0794, Request for TS (RTS-246A) Rev to RTS-246 to License DPR-49, Revising TS Section 3.7, Containment Sys
NG-93-5097, Forwards Response to NRC Concerns Expressed in Re License Amend Request RTS-246 Submitted by Util
HL-3424, Responds to NRC Re Violation Noted in Insp Repts 50-321/93-11 & 50-366/93-11.Corrective Actions:Calibr Procedure 57CP-CAL-041-1S Temporarily Revised & Calib Procedure 57CP-T46-002-2S Reviewed
B17334, Submits Response to Violations Noted in Investigations Rept 1-96-019 Re NRC Combined Insp Repts 50-245/96-06 & 50-245/96-09.Corrective Actions:Sp 696.2, Plant Equipment Operations Log & Associated OPS Form 696.2-1A Revised
05000259/LER-1998-001-03, :on 980414,standby Gas Treatment Sys HEPA Filter Testing Was Not in Compliance W/Ansi Std Requirements.Caused by Lack of Understanding of DOP Testing. Filter Testing Training Will Be Provided
05000260/LER-1988-019-01, :on 881214 & 27,discovered That Neutron Source Movement Performed W/O Min Required Trains of stand-by Gas Treatment Sys.Caused by Failure to Track Status of Subj Sys Train Following Performance of Surveillance
05000245/LER-1987-029-01, :on 870724,standby Gas Treatment Inoperability Occurred During Refueling Operations.Caused by Operator Error.Fuel Handling Operations Terminated & Limit Switch 1601-28 Repositioned
05000282/LER-1986-006, :on 860908,diesel Generator D1 & Diesel Cooling Water Pump Declared Inoperable Simultaneously.Caused by Leakage Through Fuel Header Check Valve & Rupture of Brass Tubing,Respectively.Valve & Tubing Replaced
05000321/LER-1987-017-01, :on 871008,plant Operations Personnel Noticed Water Dripping from Standby Gas Treatment Sys (SGTS) Filter Train B Drain.Caused by Personnel Errors.Carbon Filter Medium Replaced & SGTS Returned to Operation
05000260/LER-1988-050, :on 881214,neutron Source Movement Between Units Spent Fuel Pools Performed W/O Min Standby Gas Treatment Sys Train Technically Operable.Caused by Failure to Track Operability Status.Procedure Revised
05000331/LER-1998-002, :on 980403,unexpected ESF Actuation Was Noted. Caused by Inadequate Procedure.Relay Was Replaced & STP Revised
05000282/LER-1998-004, :on 980226,inoperable ESF Equipment Was Noted in Alternate Train During DG Monthly Surveillance Run.Caused by Changes to Settings.Procedure Changes Will Be Completed to Ensure Proper Molr Setpoints
05000333/LER-1997-008-01, :on 970806,both Trains of SGTS Were Declared Inoperable Due to Flow Restriction in Discharge Line. Developed Periodic Surveillance That Can Adequately Detect Blockage in Drain Line
05000282/LER-1986-006-01, :on 860907,simultaneous Inoperability of One Diesel Generator & One Diesel Cooling Water Pump Occurred. Caused by Rupture of Brass Tubing.Tubing Replaced W/Stainless Steel
05000331/LER-1997-011, :on 970919,TS Surveillance Testing of Power Operated Primary Ci Valves Was Missed Due to Improper Administration of TS Amend 181.Revised Procedure & Performed Closure Time Tests
05000281/LER-1986-012-03, :on 860821,during Monthly Performance Test, Relay LM-REL-200A1 Found Failed & on 860826 Relay R-LM-REL-200A2 Found Failed.Caused by Intermittent Operation of Comparator.Relays Replaced & Tested
05000259/LER-1986-036-01, :on 861208,diesel Generator 1A Declared Inoperable During Performance of Monthly Surveillance Instruction,Resulting in Tech Spec Noncompliance.Caused When RHR HX Mistakenly Removed from Svc
05000259/LER-1986-026-01, :on 860724,mechanical Overspeed Trip of Standby Diesel Generator D Occurred.Caused by Failure of Assistant Unit Operator to Fully Lower Governor Setting to Low Speed Stop Position Prior to Start
05000293/LER-1998-028, :on 981230,CR High Efficiency Air Filtration Sys Relative Humidity Switches Were Inoperable.Caused by Gradual Degradation of Nylon Filaments.Modified Sys Control Circuitry.With
05000331/LER-1997-013, :on 971119,noted That Inoperable Primary Containment Isolation Valves Exceeded TS Lco.Caused by Misinterpretation of Two TS Definitions.Revised Appropriate Plant Procedures to Provide Correct Guidance
05000306/LER-1997-005-02, :on 971117,sudden Pressure Lockout of Number 10 Transformer Resulted in Auto Load Rejection/Restoration on SR Bus.Caused by Transformer Being Taken Oos.Replaced 10 Transformer Sudden Transformer Relay 63T10
05000321/LER-1986-007-01, :on 860331,standby Gas Treatment Filter Train 1A Found Degraded by Wet Downstream Charcoal Absorber Bed. Caused by Personnel Failure to Recognize Potential Leaking Deluge Valve.Charcoal Bed Replaced
05000254/LER-1985-022-08, :on 851228,air Flow to Train a of Standby Gas Treatment Sys Dropped to Zero & Train B Failed to Start. Caused by Plastic Bag Over Intake Screen of Train a & Blown Fuse in Train B Timer Mechanism
05000245/LER-1997-016-01, :on 970401,discovered That Vent/Purge Operation Using Sgts,Opening & Closing Sequence of Atmospheric Control Created Temporary Flow Path Between Reactor Bldg & Primary Containment Prior to Isolation of AC Sys
05000245/LER-1997-021-01, :on 970228,failure of 1-SG-1B to Provide Complete Isolation of SBGT Sys from RBVS Occurred.Caused by Inadequate Design Review & Installation & Lack of Questioning attitude.1-SG-1B Physically Modified
05000254/LER-1984-012-07, :on 840802,reactor Bldg Vent Sys Isolated, Standby Gas Treatment Sys Train B auto-started & Sys Heater Tripped.Caused by Incorrect Electrical Wiring.Wiring Diagrams Being Corrected
05000237/LER-1985-030-03, :on 850716,high Radiation Signal from Refueling Floor Radiation Monitors Caused Reactor Bldg Ventilation Sys Trip.Caused by Fuel Handlers Lifting Machinery for Repairs.Machine Submerged
05000249/LER-1985-011, :on 850416,high Radiation Signal from Refueling Floor Radiation Monitors Caused Reactor Bldg Ventilation Sys Trip & Isolation W/Standby Gas Treatment Sys B Automatically Starting
05000366/LER-1992-024-01, :on 921117,personnel Error Resulted in Missed Surveillance on Standby Gas Treatment Sys.Personnel Involved Counseled
05000249/LER-1985-011-05, :on 850416,reactor Bldg Vent Trip & Isolation Occurred W/Standby Gas Treatment Sys B Automatically Started.Caused by Fuel Handlers Removing Machinery from Fuel Pool.Machinery Washed to Reduce Dose Levels
05000298/LER-1985-002, :on 850326,three Deficiencies Identified in Standby Gas Treatment Sys,Namely Expansion Sleeves at Fan Discharge & in Crossover Line,Supports for Crossover Duct & Housing Drains.Caused by Design Inadequacies
05000263/LER-1978-003-03, /03L-0:on 780228,during Surveillance Test,Min Flow in a Train SBGTS Could Not Be Attained as Required by Tech Spec 3.7.B.1.Caused by Foreign Matl in BV-4 Positioner. Replaced Positioner
05000282/LER-1983-029-01, /01T-0:on 831117,bus Tiebreaker 26-8 Racked Out, Leaving Bus 15 W/Only One Offsite Power Source.Caused by Personnel Error.Personnel Counseled
05000219/LER-1983-002-03, /03L-0:on 830123,startup Banks Removed from Svc Due to Dilution Plant Main Breaker Cable Termination Failure.Cause Under Investigation.Dilution Pump Power Feed Terminations Replaced
05000321/LER-1982-076-03, /03L-0:on 820806,while in Steady State Operation W/Routine Calibr in Progress,Two Relative Humidity Controllers Found Inoperable on B Standby Gas Treatment Filter Train.Caused by Component Failure Due to Corrosion
05000245/LER-1993-014-02, :on 930923,potential Uninhabitability of Control Room Occurred.Caused by Deficiency in Standby Gas Treatment.Openings Plugged to Preclude Potential Discharge of Radioactivity
05000361/LER-1990-011-01, Corrected LER 90-011-01:on 900722,AFW Bypass Control Valve 3HV-4763 Declared Inoperable After Failing to Close Due to Mechanical Failure of Solenoid Valve.Valve Manually Isolated & Solenoid Valve Replaced
05000254/LER-1993-009-04, :on 930714,SBGT Methyl Iodide Test Failed Due to Age of Charcoal Combined W/Stringent Test Criteria. Replaced Charcoal Absorber in Both Trains of Sbgt
05000321/LER-1982-027-03, /03L-0:on 820412,site Failed to Prove Operability for Two Trains within 4-h W/Standby Gas Treatment Filter Train 1T46-C001B Inoperable.Caused by Manometer Failure. Manometers Replaced
05000219/LER-1982-022-03, /03L-0:on 820416,after 1B Breaker Closed & Startup Transformer S1B Breaker Failed to Operate,Operator Determined That Fuse Had Blown.Caused by Mild Momentary Overload.Fuse Replaced & Breaker Reset & Returned to Svc
05000219/LER-1982-022, Forwards LER 82-022/03L-0.Detailed Event Analysis Encl
05000423/LER-1993-002, :on 930206 & 07,Train a & Train B CR Pressurization Sys Failed 18-month Surveillance Test, Respectively.Caused by Moisture in Air Banks & Pressure Oscillations.Air Banks Purged
BSEP-93-0033, Special Rept SR 2-93-0002:on 930209,reactor Bldg Fire Door 206 Declared Inoperable to Allow Equipment Cables & Lighting to Be Run Through Door.Compensatory Measures Remained in Effect Until Door Restored on 930223
05000277/LER-1989-028, :on 891108,determined That Standby Gas Treatment Sys Heater Control Relays Installed W/O Environ Qualification.Caused by Lack of Procedural Guidance.Relays Relocated
05000277/LER-1982-004-03, /03L-0:on 820206,during Surveillance Testing of Primary Containment Isolation Sys,Standby Gas Treatment Filter a Inlet Damper Failed to Automatically Open.Caused by Defective Damper Control Switch.Switch Replaced
05000280/LER-1982-029-01, /01T-0:on 820222,steam Line Flow Instruments for a Main Steam Line,Channels 3 & 4, & B Main Steam Line,Channel 3,reported Inoperable During Startup.Caused by Lack of Power Supply Fuses to Transmitters.Fuses Replaced
05000281/LER-1981-083-03, /03L-0:on 811231,steam Flow Instruments FI-474 on a Main Stream Line & FI-485 on B Main Stream Line Found Isolated.Caused by Instruments Inadvertently Left Isolated Until Discovery During Startup
05000298/LER-1993-018, :on 930430,potential Single Failure Vulnerability Noted W/Single Inlet Damper in Common Supply Duct.Caused by Faulty Original Design.Inlet Damper Sealed Open to Eliminate Single Failure
05000263/LER-1989-040, :on 891219,secondary Containment Failed to Meet Operability Requirements for Secondary Containment Capability.Caused by Design Deficiencies.On 930317,addl Design Deficiency Noted Re Damper Controls
05000333/LER-1980-065-03, /03T-0:on 800814,during Normal Operations,While Inerting Primary Containment,Standby Gas Treatment Sys A&B Found Inoperable.Caused by Blocked Drain Line Allowing Water to Accumulate in Line Until Fans Could Not Discharge
05000293/LER-1989-030, :on 890926,control Room High Efficiency Air Filtration Sys Flowrate non-conservative Due to Procedure Error.Caused by Transcription Error.Procedure Revised & Test Reperformed Using Corrected Procedure
05000254/LER-1980-002-03, /03L-0:on 800111,while Performing in-place Charcoal Absorber Leak Rate Test on Standby Gas Treatment sys,1.93% Leakage Found.Caused by Damaged Gasket on 4x4 Inch Access Plate.Gasket Replaced
05000286/LER-1979-001-03, /03L-0 on 790211:high Dew Point & Air Leakage on Breaker 2-6 Noted.To Preclude Breaker Damage,Breaker 2-6 Was Opened.Caused by Apparent Gasket Leak in Westinghouse C-A Breaker.Feeder & Breaker Repaired
05000254/LER-1979-002-03, /03L-0 on 790110:during Freon Test,Noted That Freon Penetration Through Charcoal Absorbers Exceeded Tech Spec Max.Caused by One of Charcoal Clamping Levers Not Being Fully Latched
05000265/LER-1979-001-03, /03L-0 on 790104:during Monthly Operability Test, Inlet Air Heater on a Standby Gas Treatment Sys Was Found Inoperable.Caused by Setpoint Drift of Flow Switch 1/2-7541-8A
05000321/LER-1980-002-03, /03L-0:on 800112,while Performing HNP-1-3655,fan lT46-C001B Would Not Meet Flow Requirements Per Tech Specs. Ten Days Later,While Venting Drywell Per HNP-1-1500,flow Did Not Meet Tech Specs.Equipment Recalibr
05000321/LER-1980-006-03, /03L-0:on 800113,one Standby Gas Treatment Sys Rendered Inoperable W/Both Units in Power Operation.Unit Not Proven Operable within Required 4-h.Caused by Inability to Prove Filter Train Operable within 4-h
05000254/LER-1979-036-03, /03L-0:on 791115,during in-place Freon Test on 1/2-B-7509 Standby Gas Treatment Sys,Freon Penetration Through Charcoal Absorbers Was 1.05%.Caused by Faulty Compressing of Internal Gaskets.New Gaskets Installed
05000254/LER-1979-033-01, /01T-0:on 791020,piping Restraint 1/2-7509-R149 Had Safety Factor of Less than Two.Standby Gas Treatment Sys a & B Declared Inoperable.Caused by Improper Design Safety Factors.Restraint Modified
05000254/LER-1979-032-01, /01T-0:on 791026,piping Restraints 1/2-7504-164 & 165 Had Safety Factor of Less than Two.Standby Gas Treatment Sys a & B Declared Inoperable.Caused by Improper Design of Safety Factors.Restraints Modified
05000282/LER-1979-025-01, /01T-0:on 790830,during Pipe Walkdown Insp,One Pipe Hanger in Auxiliary Feedwater Sys Was Found Inoperable. Caused by Incomplete Installment During Const.Unit Repaired Immediately & Was Returned to Full Power
05000280/LER-1995-011, :on 951018,both Source Range Nuclear Instruments de-energized Due to Personnel Error.Initiated Abnormal Procedure-40
05000281/LER-1980-011-01, /01T-0:on 800819,at 12% Power,Steam Flow Transmitters (FI-474,475,484,485,494 & 495) Isolated Contrary to Tech Spec-3.7.B.Caused by Transmitters Being Isolated Following Containment Integrated Leak Rate Test
05000281/LER-1978-040-03, /03L-0 on 781116:routine Testing Revealed Failure of Heat Tracing Circuit 4C Unit 2 Boron Injection Tank Top Recirculation Return.Caused by Boric Acid Damage to the Heat Tracing Circuit
05000281/LER-1978-039-03, /03L-0 on 781115:during Normal Oper,It Was Noted That B Loop Hot Leg Temp Sensing Element TI-2-422A Was Drifting Low.Caused by Packing Leak Which Reduced Resistance of the Sensing Element
05000293/LER-2004-005, Regarding Standby Gas Treatment System Inoperable Due to Pneumatic Accumulator Leakage Rate
05000247/LER-2002-006, Two of Three Emergency Diesel Generators Inoperable Due to Component Failure; a Condition Prohibited by Tech Specs
05000247/LER-2002-003, Loss of 138 Kv Offsite Power Source Due to Ground Protection Trip Results in Auto Start of Emergency Diesel Generators
05000247/LER-2002-001, Re While Preparing for Maintenance Activities Personnel Error Results in Two Emergency Diesel Generators Inoperable
BVY 14-010, Defueled Technical Specifications and Revised License Conditions for Permanently Defueled Condition
05000254/LER-1987-025-03, :on 871125,control Room Habitability Design Basis Assumption Error Occurred Re Filter Efficiencies. Caused by Analysis Deficiency.Review Performed for Filters in Question
A05743, Advises That Automatic Purge/Vent Valve Closure on High Radiation Signal,Per NUREG-0737,Item II.E.4.2,unjustified Based on Low Probability of RCS Leak When Purge Valves Open, in Response to SER Open Item
BECO-LTR-96-040, Application for Amend to License DPR-35,proposing Part of Overall Effort to Improve Outage Performance at Plant
05000321/LER-1981-122-03, /03L-0:on 811109,operator Observed That 1B Standby Gas Treatment Had High Moisture Alarm Present. Caused by Inoperability of Heaters Due to Faulty Connections.Connections Repaired
05000281/LER-1986-012-02, :on 860821,during Monthly Performance Test, Relay LM-REL-200A1 Found Failed & on 860826,relay LM-REL-200A2 Found Failed.Caused by Intermittent Operation of Comparator.Relays Replaced & Tested
05000219/LER-1982-047-03, /03L-0:on 821004,loss of Power to Reactor Protection Sys Motor Generator Set 1 Caused Half Scram. Caused by Burned & Scarred Relay Contacts.Relay Replaced & Sys Returned to Svc.Spare Relays on Order