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 Start dateReporting criterionEvent description
05000263/LER-1975-0165 September 1975
05000263/LER-1976-011, Updated LER 76-011:on 760802 & 0830,during Test,Rcic Turbine Tripped on Overspeed.Caused by Steam Void in Discharge Piping Due to Valve Leakage from Feedwater Sys.Control Oil Sys Modified to Improve Control Valve Response22 October 1976
05000263/LER-1976-012, Updated LER 76-012:on 760805,generic ECCS Model Analysis Indicated 2200 F PCT May Be Exceeded at Reduced Core Flows. MAPLHGR 5% Reduction at Less than 90% Core Flow implemented.W/760910 Ltr3 September 1976
05000263/LER-1976-01822 September 1976
05000263/LER-1976-02324 November 1976
05000263/LER-1977-0039 February 1977
05000263/LER-1977-0217 September 1977
05000263/LER-1977-02227 September 1977
05000263/LER-1977-0237 October 1977
05000263/LER-1977-02418 November 1977
05000263/LER-1977-02527 September 1977
05000263/LER-1977-02611 October 1977
05000263/LER-1977-02721 October 1977
05000263/LER-1977-0291 November 1977
05000263/LER-1977-0309 November 1977
05000263/LER-1977-03127 October 1977
05000263/LER-1978-030, Forwards Revised LER 78-030/01X-1 to Correct Typographical Error in Valve Identification Number5 January 1979
05000263/LER-1979-022, Forwards LER 79-022/03L-011 January 1980
05000263/LER-1980-025, Forwards Updated LER 80-025/03L-129 June 1982
05000263/LER-1981-017, Forwards Updated LER 81-017/03L-12 July 1982
05000263/LER-1982-004, Updated LER 82-004/01T-1:on 820410,inboard & Outboard 18-inch Dyrwell Vent Valves Failed to Close Upon Hand Switch Activation.Probably Caused by Solenoids Being Mounted Horizontally & Residual Core Magnetism.Solenoids Replaced20 May 1982
05000263/LER-1982-006, Forwards LER 82-006/03L-03 June 1982
05000263/LER-1982-007, Forwards LER 82-007/03L-025 August 1982
05000263/LER-1982-008, Forwards LER 82-008/03L-029 September 1982
05000263/LER-1982-013, Updated LER 82-013/01T-3:on 820928,1020,31 & 1102,during Preparation for Repair of E,C & F safe-ends,thru Wall Leaks Found on Each safe-end.Caused by Intergranular Stress Corrosion Cracking.Defects Repaired6 December 1982
05000263/LER-1982-016, Forwards LER 82-016/01T-012 October 1982
05000263/LER-1983-005, Forwards LER 83-005/03L-017 March 1983
05000263/LER-1983-006, Forwards LER 83-006/01T-022 April 1983
05000263/LER-1984-011, Revised LER 84-011-01:on 840218,crack Indications Discovered in Listed Locations,Including RHR Sys & Recirculation Sys Pump Suction & Discharge Valves.Caused by Igscc.Stainless Steel 304 to Be Replaced15 May 1984
05000263/LER-1992-010, Forwards LER 92-010-01,modifying Root Cause of First Event, Based on Investigation Delineated in LER 92-012-0017 November 1992
05000263/LER-1992-012, Forwards LER 92-012-01 Initially Re Failure to Include Manual Valves in Section XI Testing.Results of Review & Other ASME Section XI Program Discrepancies,Noted in Insp Rept 50-263/92-10 Warranted Rev to LER19 November 1992
05000263/LER-1993-003, Forwards Suppl 2 to LER 93-003 Re MSIVs That Exceeded TS Leakage Limit,To Reflect Results of Analysis of Sample of Film Removed from MSIV Seats Earlier This Yr26 October 1993
05000263/LER-1993-00830 August 1993
05000263/LER-1993-010, Forwards LER 93-010-00 Re Main Control Room Emergency Filtration Train Outside Design Basis Caused by in-leakage Across Inlet Dampers.Lessons Learned from Event Will Be Presented in Engineering Technical Staff Training23 November 1993
05000263/LER-1994-002, Provides Suppl Rept to LER 94-002-01.Suppl Rept Corrects Error Re Labeling of Axes for Graph of Instantaneous Trip Settings Vs Actual Current to Trip2 August 1994
05000263/LER-1994-008, Forwards Rev 0 to Calculation CA-95-044, Estimation of Cable Spreading Room Equipment Floor Loading, in Response to 950509 Telcon Request in Support of Closure of LER 94-00819 May 1995
05000263/LER-1995-007, Forwards LER 95-007-00 Re mis-positioning of Div B Drywell Spray Block Valve.Rept Contains New NRC Commitment13 November 1995
05000263/LER-1996-003, Forwards LER 96-003-00 Re re-analysis of High Energy Line Break,Error Found in Existing Analysis.Rept Contains Submitted New NRC Commitments8 May 1996
05000263/LER-1997-004, Forwards LER 97-004-00 Re Failure to Submit Relief Requests for Limited ISI Exams.Rept Contains Two New NRC Commitments24 March 1997
05000263/LER-1997-005, Forwards LER 97-005,which Contains One New Commitment.Diesel Fuel Surveillance Procedure Will Be Changed to Require Completion of Required Analyses Prior to Considering Surveillance Complete5 May 1997
05000263/LER-1997-010, Forwards LER 97-010-00 Re Failure to Include Some Supports on Reactor Head Vent Line in ISI Program in 2nd 10-Yr Interval.Rept Contains Two New NRC Commitments16 October 1997
05000263/LER-1997-011, Forwards LER 97-011-00 Re Error in Procedure Causes Failure to Transfer HPCI & RCIC Suctions to Suppression Pool.Rept Contains Four New NRC Commitments16 October 1997
05000263/LER-1997-012, Forwards LER 97-012-00 Re CST Low Level Suction Transfer Setpoint Which Did Not Provide Sufficient Submergence as Result of Design Deficiency.Commitments Made within Ltr, Submitted27 October 1997
05000263/LER-1997-013, Forwards LER 97-013-00,re Insertion of Manual Scram Due to Loss of Condenser Vacuum.Caused by Electrical Fault Tripping Recombiners.New Commitments Listed22 December 1997
05000263/LER-1997-014, Forwards LER 97-014-00 Re Div II ADS Inhibit Switch Which Was Not Tested as Required by Ts.Commitment,Listed12 January 1998
05000263/LER-1998-001, Forwards LER 98-001-00 Re Containment Isolation Valve Leakage Which Exceeded Ts.Commitment Made by Util,Listed22 April 1998
05000263/LER-1998-003, Forwards LER 98-003-00 Re Transgranular Stress Corrosion Cracking Identified in Control Rod Drive Lines.Rept Contains Listed New NRC Commitments14 May 1998
05000263/LER-1998-004, Forwards LER 98-004-00 Re Manual Scram Inserted Following Pressure Transient Closes Air Ejector Suction Isolation Valves & Trips Offgas Recombiners.Ler Contains Listed Commitment9 October 1998
05000263/LER-1998-005, Forwards LER 98-005-00,re HPCI Being Removed from Service to Repair Steam Leak in Drain Trap Bypass.Commitments Made by Util Are Listed21 October 1998
05000263/LER-2001-01123 October 200110 CFR 50.73(a)(2)(iv)(A), System Actuation

While in coastdown for refueling, at 1712 on October 23, 2001, a human performance error caused a reactor scram. The scram was a result of inadvertent contact of a support brace attached to a sensitive instrument rack by an individual performing work in the area.

The primary cause of the event was determined to be inadequate work practices. Although the worker was aware of the sensitive nature of the instrumentation on the rack in the area in which he was working, the worker elected to transport heavy barrier stanchions through the narrow pathway immediately adjacent to a sensitive instrument rack. The worker lost his balance and bumped a support brace for the instrument rack.

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