| | | Reporting criterion |
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| 05000282/LER-1998-001, :on 980626,leakage Through Redundant CR Steam Exclusion Dampers Was Found to Exceed Value Assumed in HELB Analysis.Caused by Actuator Being Out of Adjustment.Will Implement Design Change & Repair or Replace Dampers |
- on 980626,leakage Through Redundant CR Steam Exclusion Dampers Was Found to Exceed Value Assumed in HELB Analysis.Caused by Actuator Being Out of Adjustment.Will Implement Design Change & Repair or Replace Dampers
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(x) 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition 10 CFR 50.73(a)(2) |
| 05000282/LER-1998-001-01, Forwards LER 98-001-01 Re Leakage Through Redundant CR Steam Exclusion Dampers Found to Exceed Value Assumed in HELB Analysis.Licensee Has Modified Three NRC Commitments Made in Original Ler,As Noted by Corrective Actions in | Forwards LER 98-001-01 Re Leakage Through Redundant CR Steam Exclusion Dampers Found to Exceed Value Assumed in HELB Analysis.Licensee Has Modified Three NRC Commitments Made in Original Ler,As Noted by Corrective Actions in Italics | |
| 05000306/LER-1998-001-01, :on 980121,10 Transformers Were Locked Out. Caused by Cognitive Error by Sys Engineer Writing Work Order to Isolate Breaker 1H3.Revised Procedures |
- on 980121,10 Transformers Were Locked Out. Caused by Cognitive Error by Sys Engineer Writing Work Order to Isolate Breaker 1H3.Revised Procedures
| 10 CFR 50.73(a)(2)(iv), System Actuation |
| 05000306/LER-1998-001, Forwards LER 98-001-00 Re Lockout of 10 Transformer Resulting in Auto Load Rejection/Restoration on Safety Related Bus.Event Reported Via Emergency Notification Sys in Accordance w/10CFR50.72 on 980121 | Forwards LER 98-001-00 Re Lockout of 10 Transformer Resulting in Auto Load Rejection/Restoration on Safety Related Bus.Event Reported Via Emergency Notification Sys in Accordance w/10CFR50.72 on 980121 | |
| 05000306/LER-1998-002, :on 980201,defect in Primary Sys Pressure Boundary Was Observed on Motor Tube Base of Part Length CRDM Housing.Caused by Flaw on G9 Part Length Crdm.Unit 2 Part Length CRDMs Have Been Removed & Replaced |
- on 980201,defect in Primary Sys Pressure Boundary Was Observed on Motor Tube Base of Part Length CRDM Housing.Caused by Flaw on G9 Part Length Crdm.Unit 2 Part Length CRDMs Have Been Removed & Replaced
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(iv), System Actuation 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(x) 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition 10 CFR 50.73(a)(2) |
| 05000306/LER-1998-002-01, Forwards LER 98-002-01,re Defect in Primary Sys Pressure Boundary Observed on Motor Tube Base of Part Length CRDM Housing.Commitments Made within Ltr,Encl | Forwards LER 98-002-01,re Defect in Primary Sys Pressure Boundary Observed on Motor Tube Base of Part Length CRDM Housing.Commitments Made within Ltr,Encl | |
| 05000306/LER-1998-002-02, Forwards LER 98-002-02 Re Defect in Primary Sys Pressure Boundary.Encl LER Documents Closure of Event with Respect to Prairie Island,Unit 1 | Forwards LER 98-002-02 Re Defect in Primary Sys Pressure Boundary.Encl LER Documents Closure of Event with Respect to Prairie Island,Unit 1 | |
| 05000282/LER-1998-003, :on 980122,routing of Containment Dome Fan Coil Unit Exhaust Dampers Control Circuit Wiring Contrary to Configuration Described in USAR Occurred.Investigation Produced No Conclusive Evidence for Cause.Procedure Revised |
- on 980122,routing of Containment Dome Fan Coil Unit Exhaust Dampers Control Circuit Wiring Contrary to Configuration Described in USAR Occurred.Investigation Produced No Conclusive Evidence for Cause.Procedure Revised
| 10 CFR 50.73(a)(2) |
| 05000306/LER-1998-003-02, :on 980526,discovered Inadequate App R Fire Barriers & Unsealed Fire Barrier Penetrations.Caused by Lack of Adequate Separation of Safe Shutdown Equipment.Firewatch Has Been Established as Compensatory Measure |
- on 980526,discovered Inadequate App R Fire Barriers & Unsealed Fire Barrier Penetrations.Caused by Lack of Adequate Separation of Safe Shutdown Equipment.Firewatch Has Been Established as Compensatory Measure
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(iv), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition |
| 05000306/LER-1998-003, Forwards LER 98-003-00 Re Inadequate App R Fire Barriers & Unsealed Fire Barrier Penetrations.Licensee Made Four New Commitments,Indicated as Corrective Action Statements in Italics | Forwards LER 98-003-00 Re Inadequate App R Fire Barriers & Unsealed Fire Barrier Penetrations.Licensee Made Four New Commitments,Indicated as Corrective Action Statements in Italics | |
| 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 |
- 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
| 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2) |
| 05000306/LER-1998-004-01, :on 980910,shield Building Integrity Was Breached.Caused by Inadequate TS Change.Revised Affected Procedures.With |
- on 980910,shield Building Integrity Was Breached.Caused by Inadequate TS Change.Revised Affected Procedures.With
| 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 05000282/LER-1998-005-01, Forwards LER 98-005-01,re Inoperability of Actuation Logic for MSIV in Certain Flooding Conditions from Feedwater Line Break.Commitments Made within Ltr,Encl | Forwards LER 98-005-01,re Inoperability of Actuation Logic for MSIV in Certain Flooding Conditions from Feedwater Line Break.Commitments Made within Ltr,Encl | |
| 05000306/LER-1998-005-02, :on 981109,RT from 22% Power During Planned SD Operation Was Noted.Caused by Tt.Fw Heater Drain Level Control Was Thoroughly Inspected & Calibrated.With |
- on 981109,RT from 22% Power During Planned SD Operation Was Noted.Caused by Tt.Fw Heater Drain Level Control Was Thoroughly Inspected & Calibrated.With
| 10 CFR 50.73(a)(2)(iv), System Actuation |
| 05000282/LER-1998-005, :on 980422,inoperability on Actuation Logic for MSIV in Certain Flooding Conditions from Fwlb Was Noted. Cause for Flooding Not Identified.Doors Have Been Opened on Unit 1 to Preclude Flooding Concerns W/Respect to MSIVs |
- on 980422,inoperability on Actuation Logic for MSIV in Certain Flooding Conditions from Fwlb Was Noted. Cause for Flooding Not Identified.Doors Have Been Opened on Unit 1 to Preclude Flooding Concerns W/Respect to MSIVs
| 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2) |
| 05000306/LER-1998-006-01, :on 981219,unplanned Actuation of ESF Equipment During Performance of Sp.Caused by Personnel Error.Control Room Took Prompt Action & Returned Plant to Proper Status & Second pre-job Briefing for SP-2126 Was Conducted |
- on 981219,unplanned Actuation of ESF Equipment During Performance of Sp.Caused by Personnel Error.Control Room Took Prompt Action & Returned Plant to Proper Status & Second pre-job Briefing for SP-2126 Was Conducted
| 10 CFR 50.73(a)(2)(x) 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition 10 CFR 50.73(a)(2) |
| 05000282/LER-1998-006, :on 980319,equipment Discrepancy Was Confirmed for Electrical Equipment Associated w/122 CR Outside as & Steam Exclusion Damper CD-34177.Caused by Failure to Find Location of CD-34177.Will Correct Documents |
- on 980319,equipment Discrepancy Was Confirmed for Electrical Equipment Associated w/122 CR Outside as & Steam Exclusion Damper CD-34177.Caused by Failure to Find Location of CD-34177.Will Correct Documents
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(x) 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition 10 CFR 50.73(a)(2)(viii) 10 CFR 50.73(a)(2) |
| 05000306/LER-1998-006, Forwards LER 98-006-00 Re Unplanned Actuation of ESF Equipment During Performance of Sp Due to Personnel Error. Event Was Reported Via ENS IAW 10CFR50.72 on 981219.Two New Commitments Are Indicated as C/A Statements | Forwards LER 98-006-00 Re Unplanned Actuation of ESF Equipment During Performance of Sp Due to Personnel Error. Event Was Reported Via ENS IAW 10CFR50.72 on 981219.Two New Commitments Are Indicated as C/A Statements | |
| 05000282/LER-1998-007-01, :on 980519,DG Logic Testing Was Noted in Violation of Ts.Caused by DG Testing Was Being Performed in Compliance W/Interpretation of Historical Regulatory Requirements & Commitments.Revised Surveillance Procedures |
- on 980519,DG Logic Testing Was Noted in Violation of Ts.Caused by DG Testing Was Being Performed in Compliance W/Interpretation of Historical Regulatory Requirements & Commitments.Revised Surveillance Procedures
| 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(x) |
| 05000282/LER-1998-007, :on 980519,DG Logic Testing Was Performed. Caused by Four Lines of Reasoning Applied to Issue at Various Times in Past.Reviewed Control Circuits of EDGs & Control Circuits |
- on 980519,DG Logic Testing Was Performed. Caused by Four Lines of Reasoning Applied to Issue at Various Times in Past.Reviewed Control Circuits of EDGs & Control Circuits
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2) |
| 05000282/LER-1998-008, :on 980605,Unit 1 Tripped.Caused by Equipment Failure.Plant Reactor Trip Recovery Have Been Improved Via Temporary Memo |
- on 980605,Unit 1 Tripped.Caused by Equipment Failure.Plant Reactor Trip Recovery Have Been Improved Via Temporary Memo
| 10 CFR 50.73(a)(2)(iv), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition |
| 05000282/LER-1998-009, :on 980731,determined That Recent Testing of Rc Vent Sys Had Not Been Performed,Per Ts.Caused by Inadequate Procedures.Surveillance Procedures Will Be Modified to Verify Flow Through Rc Vent Sys Paths |
- on 980731,determined That Recent Testing of Rc Vent Sys Had Not Been Performed,Per Ts.Caused by Inadequate Procedures.Surveillance Procedures Will Be Modified to Verify Flow Through Rc Vent Sys Paths
| |
| 05000282/LER-1998-009-01, :on 980731,noted That Recent Testing of RCS Vent Paths Had Not Been Performed in Literal Compliance with Wording of TS 4.18.1.Caused by Misunderstanding of Wording in TS Section 4.18.Will Modify Surveillance Procedures |
- on 980731,noted That Recent Testing of RCS Vent Paths Had Not Been Performed in Literal Compliance with Wording of TS 4.18.1.Caused by Misunderstanding of Wording in TS Section 4.18.Will Modify Surveillance Procedures
| |
| 05000282/LER-1998-011, :on 980813,discovered That Valve Stroke Times Were Outside Alert Limits on Four Occasions & Corrective Acitons Were Not Taken.Caused by Erroneous Procedure. Subject Procedure Was Quarantined Until Corrected |
- on 980813,discovered That Valve Stroke Times Were Outside Alert Limits on Four Occasions & Corrective Acitons Were Not Taken.Caused by Erroneous Procedure. Subject Procedure Was Quarantined Until Corrected
| 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 05000282/LER-1998-012, :on 980826,some Cables in Two Fire Areas in Auxiliary Building Were Not Protected by 1 H Fire Barrier. Caused by Error in Rev of Safe SD Analysis.Installed 1 H Fire Rated Barriers to Protect MV-32080 & MV-32163 |
- on 980826,some Cables in Two Fire Areas in Auxiliary Building Were Not Protected by 1 H Fire Barrier. Caused by Error in Rev of Safe SD Analysis.Installed 1 H Fire Rated Barriers to Protect MV-32080 & MV-32163
| 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 05000282/LER-1998-012-01, Forwards LER 98-012-01 Re Fire Area 58/73 App R Safe Shutdown Analysis Issues.Attachment 2 Contains Detailed Safety Significance Evaluation for Info.Event Reported Via ENS IAW 10CFR50.72 on 980826 | Forwards LER 98-012-01 Re Fire Area 58/73 App R Safe Shutdown Analysis Issues.Attachment 2 Contains Detailed Safety Significance Evaluation for Info.Event Reported Via ENS IAW 10CFR50.72 on 980826 | |
| 05000282/LER-1998-012-03, Forwards LER 98-012-03,re Fire Areas 58/73 App R Safe SD Analysis Issues.No New Commitments Made,One Commitment Revised Previously Made Indicated in Corrective Actions | Forwards LER 98-012-03,re Fire Areas 58/73 App R Safe SD Analysis Issues.No New Commitments Made,One Commitment Revised Previously Made Indicated in Corrective Actions | |
| 05000282/LER-1998-012-02, Forwards LER 98-012-02,re Fire Areas 58/73 App R Safe Shutdown Analysis Issues.Rept Has Been Changed to Delete Inappropriate Characterization of Aspect of Event as Violation of 10CFR50,App R | Forwards LER 98-012-02,re Fire Areas 58/73 App R Safe Shutdown Analysis Issues.Rept Has Been Changed to Delete Inappropriate Characterization of Aspect of Event as Violation of 10CFR50,App R | |
| 05000282/LER-1998-013, :on 981011,discovered That Scaffold Installation Interfered with Operability of Steam Exclusion Check Damper.Caused by Inadequate Procedural Guidance.Util Removed Interfering Portion of Scaffold & Revised Procedure |
- on 981011,discovered That Scaffold Installation Interfered with Operability of Steam Exclusion Check Damper.Caused by Inadequate Procedural Guidance.Util Removed Interfering Portion of Scaffold & Revised Procedure
| 10 CFR 50.73(a)(2)(iv), System Actuation 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition 10 CFR 50.73(a)(2)(1) |
| 05000282/LER-1998-014, :on 980827,fire Area 32 App R SS Analysis (SSA) Issues Were Noted.Caused by App R SSA Being Reconstituted. Compensatory Measures Will Be Maintained in Fire Area 32 Until Fire Barrier for Control Cable Replaced |
- on 980827,fire Area 32 App R SS Analysis (SSA) Issues Were Noted.Caused by App R SSA Being Reconstituted. Compensatory Measures Will Be Maintained in Fire Area 32 Until Fire Barrier for Control Cable Replaced
| 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 05000282/LER-1998-014-01, Forwards LER 98-014-01,re Fire Area 32 App R Safe Shutdown Analysis Issues.Detailed Safety Significance Evaluation for Event Included in Attachment 2.Event Reported Via ENS IAW 10CFR50.72 on 980827 | Forwards LER 98-014-01,re Fire Area 32 App R Safe Shutdown Analysis Issues.Detailed Safety Significance Evaluation for Event Included in Attachment 2.Event Reported Via ENS IAW 10CFR50.72 on 980827 | |
| 05000282/LER-1998-015, :on 980827,containment to RHR MOVs App R Safe Shutdown Analysis (SSA) Issues Noted.Caused by Oversight During Completion of Current Ssa.Compensatory Actions Will Be Maintained Until Status of MOVs Resolved |
- on 980827,containment to RHR MOVs App R Safe Shutdown Analysis (SSA) Issues Noted.Caused by Oversight During Completion of Current Ssa.Compensatory Actions Will Be Maintained Until Status of MOVs Resolved
| 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 05000282/LER-1998-015-01, Forwards LER 98-015-01,re Containment to RHR MOVs App R Safe Shutdown Analysis Issues.Attachment 2 Contains Detailed Safety Significance Evaluation for NRC Info.Event Reported Via ENS IAW 10CFR50.72 on 980827 | Forwards LER 98-015-01,re Containment to RHR MOVs App R Safe Shutdown Analysis Issues.Attachment 2 Contains Detailed Safety Significance Evaluation for NRC Info.Event Reported Via ENS IAW 10CFR50.72 on 980827 | |
| 05000282/LER-1998-016, :on 981029,negative Flux Rate RT Occurred Upon CR Insertion After Failure of CRD Cable.Caused by Internal Short Circuit Developing in CRDM Patch Cables at Reactor Head Connector.Replaced CRDM Patch Cables.With |
- on 981029,negative Flux Rate RT Occurred Upon CR Insertion After Failure of CRD Cable.Caused by Internal Short Circuit Developing in CRDM Patch Cables at Reactor Head Connector.Replaced CRDM Patch Cables.With
| 10 CFR 50.73(a)(2)(iv), System Actuation |
| 05000282/LER-1998-017, :on 981103,failure to Test SR Hi Flux Trip Functions During non-refueling Outages as Required by TS 4.1-1A Was Noted.Caused by No Sp Existing to Test SR Hfr Trip Logic Function.Developed Procedure for Testing |
- on 981103,failure to Test SR Hi Flux Trip Functions During non-refueling Outages as Required by TS 4.1-1A Was Noted.Caused by No Sp Existing to Test SR Hfr Trip Logic Function.Developed Procedure for Testing
| 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(x) |
| 05000282/LER-1998-018, :on 981117,discovered That Surveillance Testing of Boric Acid Storage Tank Level Instrumentation Places Plant in Condition Where Single Failure Could Cause Inability to Inject Concentrated Boric Acid |
- on 981117,discovered That Surveillance Testing of Boric Acid Storage Tank Level Instrumentation Places Plant in Condition Where Single Failure Could Cause Inability to Inject Concentrated Boric Acid
| 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition |
| 05000282/LER-1998-019, :on 981209,discovered Condition Where Thermally Induced Pressure Transient Has Potential to Overpressurize Containment Penetration Piping Segment.Caused by non- Conservative Assumption.Analyses Performed |
- on 981209,discovered Condition Where Thermally Induced Pressure Transient Has Potential to Overpressurize Containment Penetration Piping Segment.Caused by non- Conservative Assumption.Analyses Performed
| 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition |