05000293/LER-2007-002, Emergency Diesel Generator Kilowatt (Kw) Power Oscillations
L-MT-06-069, Submittal of Revision 2 to the Cycle 23 Core Operating Limits Report
05000263/LER-1979-012-03, /03L-0 on 790702:during Reactor Core Isolation Cooling Sys Test,Governor end-bearing Temp Alarm Received & Bearing Exhibited High Vibration.Sys Inoperative.Caused by Turbine Oil Pump Drive Gear Failure.Gears Replaced
L-MT-03-033, Submittal of Core Operating Limits Report for Cycle 22
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
B11689, Application for Amend to License DPR-21,revising Tech Specs to Define Refuel Condition & Operability Requirements of Sys During Refuel & Shutdown Conditions.Fee Paid
B11686, Application for Amend to License DPR-21,revising Tech Specs to Consolidate Specs 3.5.F.7 & 3.5.F.8 Into One Spec,To Clarify Water Level Requirements for Refuel Cavity & Modify Lpci/Core Spray Requirements.Fee Paid
BECO-94-126, Application for Amend to License DPR-35,increasing Current EDG Allowed out-of-svc Time in Specification 3.5.F from 72 H to 7 Days
B13587, Requests Temporary Waiver of Compliance from Tech Spec 3.5.F.2 Re Emergency Diesel Generator (EDG) Limiting Condition for Operation.Waiver Would Extend Available Time to Repair Damaged Electrical Components
05000298/LER-1989-003, :on 890213,emergency Diesel Generator Manually Shutdown & Declared Inoperable Due to Air Leak in 30 Psig Control Air Header.Caused by Inadequate Design Control. Supports Added & Tubing Rerouted to Minimize Cyclic Stress
05000277/LER-1985-019, :on 850919,RHR Pump Declared Inoperable.Caused by Low Flow in Low Head Region of Pump Performance Curve. Pump Removed from Svc & Inspected.Pump Determined to Be in Compliance W/Tech Spec Requirements
05000277/LER-1986-012-01, :on 860413,partial Group I & II Isolations Occurred Due to Loss of Power to E-22 & E-23 4 Kv Emergency Busses.Caused by Failed Speed Switch Device on E-2 Diesel. Switch Replaced
05000245/LER-1983-018, :on 830517,gas Turbine Generator Failed to Start & Achieve ready-to-load Status within 48 S.Caused by Degradation of Ignitors.Ignitor Replaced.Ignitors Will Be Inspected Every Refueling Outage
05000277/LER-1985-019-01, :on 850919,RHR Pump Declared Inoperable Due to Reduced Performance of Pump in Low Head Region.Cause Undetermined.Pump Reassembled & Tested
05000277/LER-1985-013-01, :on 850812 & 19,Loop a RHR Sys Outboard Injection Valve Declared Inoperable.Caused by Mechanical Interference & Binding in Valve Yoke Assembly.Assembly Rebuilt Following Each Event
05000278/LER-1983-009-01, /01T-0:on 830908,during Surveillance Testing W/One Diesel Generator Inoperable,Breaker Between Diesel Generator E-1 & Emergency Bus E-13 Failed to Close Manually.Cause Unknown.Breaker Tested Successfully
05000277/LER-1990-024, :on 900910,personnel Failed to Perform Tech Spec Surveillance Due to Procedure Deficiency
05000293/LER-1981-054, Updated LER 81-054/01T-5:on 811230,during Review of IE Bulletin 80-11,Masonry Walls 209.1,184.2 & 184.0 Identified as Being Unstable During Tornado Depressurization Event. Caused by Design & Const Errors.Walls Will Be Modified
05000293/LER-1981-054-01, /01T-3:on 811209,during Analysis for IE Bulletin 80-11,masonry Wall 65.4 Was Discovered to Be Unstable. Caused by Design Deficiency & Const Errors.Masonry Wall Will Be Modified Per Pdcr 81-53
05000277/LER-1981-044-03, /03L-0:on 811105,E-1 Diesel Declared Inoperable After Failing to Start in 4 of 7 Tries.Caused in 2 Attempts by Failure to Wait 60-s Before Restart.Cause of Other Failures Unknown.Thirty Successive Good Starts Followed
05000265/LER-1988-020, :on 880619,improper Valving Sequence Occurred Which Resulted in Various ESF Actuations.Caused by Inadequate Equipment out-of-svc Procedure.Procedure Revised & Training Lesson Plan Developed
05000259/LER-1980-012-03, /03L-0:on 800201,during Refueling Outage,Damaged Electrical & Mechanical Overspeed Protection Assemblies Found on Reactor Core Isolation Cooling Turbine.Caused by Unclear Installation Instructions.Assemblies Repaired
05000278/LER-1979-033-03, /03L-0:on 791022,while in Cold Shutdown for refueling,3D RHR Pump Tripped on Overcurrent.Caused by Internal Motor Fan Blade Fatigue Failure.Stator Insulation Repaired & Bottom Fan Installed
05000271/LER-2010-002, For Vermont Yankee Nuclear Power Station, Regarding Inoperability of Main Steam Safety Relief Valves Due to Degraded Thread Seals
05000277/LER-1986-020-01, :on 860817,failure to Maintain Cold Shutdown Conditions & Exceeding Torus Vol Limit Discovered.Caused by Poor Planning of Proposed Operation by Station Supervision. GP-12 Revised
BECO-LTR-96-040, Application for Amend to License DPR-35,proposing Part of Overall Effort to Improve Outage Performance at Plant
05000293/LER-1999-006-02, :on 990705,both EDGs Were Inoperable.Caused by Ambient Air Temp Exceeding 88 Degrees Fahrenheit.Temporary Mods Tm 99-41 & Tm 99-42,implemented for EDG a Were Completed on 990706.With
05000298/LER-1992-013, :on 920730,error Discovered in Limiting Single Failure Assumption for ECCS Performance Analysis.Analysis in 1976 Contained Erroneous Evaluation of Eccs.Plant Mods Will Be Made to Restore Validity of Previous Assumptions