05000318/LER-1989-002-01, :on 890228,determined That Fire Barrier Penetration Inoperable.Caused by Inadequate Administrative Controls.Instructional Memo to Be Issued & Program to Be Initiated
05000318/LER-1989-006, :on 890417 & 19,discovered Tech Spec Requirement for Containment Closure During Core Alterations Not Satisfied.Caused by Inadequate Administrative Control. Corrective Actions Listed
05000318/LER-1989-011-01, :on 890710,discovered Condition Which Could Have Prevented Fulfillment of Safety Function of Structures or Sys Needed to Mitigate Consequences of Accident.Caused by Nut Failure Due to Inadequate Matl Properties
05000318/LER-1989-005-01, :on 890323,discovered That Snubber Functional Test Procedure to Satisfy Tech Specs 4.7.8.1.c & D Not Adequate.Caused by Lack of Adequate Control for Procedures. Rev Proposed to Facility Instruction CCI-104
05000317/LER-1988-011, :on 881028,discovered That Pressurizer Code Safety Valve Performing Pressure Relief Function Above Max Value Allowed by Tech Specs.Caused by Difference in Temp Profile Conditions of Safety Relief Valves
05000317/LER-1997-004, :on 970602,trip Bypasses Were Not Removed When Thermal Power Was Increased Above 15%.Caused by Failure to Recognize Difference Between Nuclear Instrument & Delta-T. Revised Plant Procedures
05000317/LER-1997-005, :on 970529,reactor Coolant Sys Leak Occurred. Caused by Failed Compression Fitting.Conducted Review of Compression Fitting Maint Performed on High Pressure Systems & Completed Insps of Compression Fittings
05000318/LER-1997-002-01, :on 970405,containment Purge Valve Isolation Sys TS Violation Occurred.Caused by Inaccurate Implementation of TS 3.9.9.Personnel Air Lock Interlocks Restored
05000317/LER-1997-002, :on 970220,misread TS Requirements Resulted in Inadequate Test.Caused by Lack of Strict Adherence to Wording of Plants TS Requirements.Edgs 1B,2A & 2B Were Successfully Tested & Returned to Svc
05000318/LER-1996-006, :on 961210,discovered EDG Had Been Inoperable for Six Days.Caused by Personnel Error.Checked Fuse Holder Covers,Conducted Tailgate Training & Revised Procedure Re Installation of Fuse Holder Covers
05000317/LER-1995-005, :on 951109,manual Reactor Trip Occurred.Caused by Failure of Digital Feedwater Control Module FIC-1111. Reviewed Design Engineering Standards & Existing FP 2000 Digital Controllers Are Being Replaced
05000317/LER-1996-003, :on 960423,discovered Holes in Containment Sump Screen Larger than Described in Ufsar.Holes Most Likely Installed During Plant Const.Sump Screens Visually Inspected & Repaired
05000317/LER-1995-005-01, :on 951109,manual Reactor Trip Occurred Due to Increasing SG 11 Water Level.Caused by Failure of Digital Control Module FIC-1111.Controller Sent to Vendor for Troubleshooting & Root Cause Analysis
05000317/LER-1995-004-01, :on 950816,inoperable Fire Barrier Penetration Seal Was Discovered.Caused by Inadequate Engineering Oversight & Less than Adequate Surveillance Procedure.Sealed Penetration Seal
05000317/LER-1995-007, :on 940719,Unit 1 Tripped from 100% Power as Result of RPS Actuation.Caused by Low SG Water Levels Due to Level Shrink.Actions Initiated to Facilitate Safe Unit Restart
05000317/LER-1995-001-01, :on 950415,Unit 1 Entered TS 3.0.3 When EDG Supplying Backup Power Became Inoperable.Caused by Leaking Fuel Injector Pump Due to Improper Drainage.Drain Lines Cleaned
05000318/LER-1995-004, :on 950414,fire Occurred in Section of Expansion Joint Matl in K Line Wall,Burning Approx Three Linear Feet of Cork Matl.Caused by Sparks from Welding Near Wall.Fire Watches Posted & Walkdown Performed
05000317/LER-1994-008, :on 940915,technician Installed Test Equipment & Opened Slide Links for Wrong Instrument Channels,Causing Two Channels of RPS to Be Unavailable for About 15 Seconds. Personnel Involved in Event Counseled
05000317/LER-1994-007, :on 940719,unit 1 Tripped from 100% Power Due to RPS Actuation.Failed Servo Amplifier Demodulator Indicator Board in Turbine EHC Cabinet Replaced & Component Level Checks Performed
05000317/LER-1994-005, :on 940424,experienced Partial Loss of Offsite Power.Caused by 13.8 Kv Voltage Regulator Fault.Voltage Regulator 1102 Replaced
05000317/LER-1990-027, :on 901206,discovered That Undersized Fuses Could Prevent safety-related Equipment from Performing Intended Safety Function.Caused by Calculational Error in Design Package.Calculation Revised
05000318/LER-1994-002-01, :on 940305,inadvertent ESF Actuation Occurred Due to Less than Adequate Self Verification.Expectations to Restart self-verification Process If Interrupted Reemphasized
05000317/LER-1993-007-01, :on 931229,performance Test Indicated Possibility of SRW Heat Exchanger Inoperability.Caused by Original Design Calculations Assuming Min SRW Flow Was Not Limiting Case.Hxs Determined Operable
05000317/LER-1993-007, :on 931229,performance Test Indicated Possibilityof SRW HX Inoperability.Caused by Original Design Calculations Assuming Min SRW Flow Was Most Limiting Case. Procedures Revised
05000318/LER-1989-012-01, :on 891227,core Alterations Performed W/Only One of Two Containment Vent Valves Closed.Caused by Procedural Deficiency.Procedures Revised to Include Valve & Surveillance Test Program Instruction Revised
05000318/LER-1989-022, :on 891227,core Alterations Performed W/Only One of Two Containment Vent Valves Closed,Violating Tech Specs.Caused by Procedural Deficiency.Surveillance Test Procedure Revised to Include Deleted Valves
05000317/LER-1989-018, :on 891106,discovered That Many Air Operated Control Valves & piston-operated Dampers Which Utilize safety-related Air Accumulators Would Not Have Performed as Expected After Loss of Air
05000317/LER-1989-020, :on 891113,determined That Some Solenoid Valves & Valve Power Supplies for Saltwater Sys May Not Be Able to Perform Design Function After Design Basis Seismic Event. Cause Undetermined.Power Supplies Upgraded
05000318/LER-1989-002, :on 890228,discovered That Fire Barrier Penetration Inoperable & Action Statement Requirements Not Satisfied.Caused by Inadequate Administrative Controls. Penetration Returned to Operable Status
05000317/LER-1990-004, :on 900123,discovered Fire Barrier Penetration Seal Open for Indeterminate Time W/O Performing Tech Spec 3.7.12.a Required Actions.Caused by Personnel Error. Temporary Fire Seal Installed