Pages that link to "NRC Form 306A"
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The following pages link to NRC Form 306A:
Displayed 50 items.
- 05000336/LER-1987-011, :on 870723,automatic Reactor Trip Occurred. Caused by Low Level in Steam Generator 1.Spray Valve 2-RC-100F Repaired & Pdic 5270 Replaced (← links)
- 05000346/LER-1998-006, :on 980624,loss of Offsite Power Was Noted. Caused by Tornado Damage to Switchyard.Tested & Repaired Affected Electrical & Mechanical Equipment Necessary to Restore Two Offsite Power Sources (← links)
- 05000382/LER-1998-015, :on 980724,discovered That T-ring Rubber Seat on CR Normal Outside Air Intake Downstream Isolation Valve Was Incorrectly Installed.Caused by Inadequate Info in Vendor Manual.Reworked Valves to Correct Configuration (← links)
- 05000382/LER-1998-014, :on 980716,manual Reactor Trip W/Subsequent EFAS Actuation Occurred.Caused by Short Circuit in FW Pump Turbine a Speed Control Relay.Plant Mgt Established Significant Event Response Team (← links)
- 05000302/LER-1998-008, :on 980716,identified Three Components in Nuclear Svcs & Decay Heat Seawater Sys That Did Not Meet Requirements of ASME Code Section Xi.Caused by Personnel Error.Plant Engineering Performed Operability Determination (← links)
- 05000483/LER-1998-006, :on 980707,RCS Pressurizer Safety Relief Valves Failed Low on as Found Set Pressure Test.Caused by Set Pressure Drift.Pressurizer SRVs Were Refurbished Following Set Pressure Testing (← links)
- 05000382/LER-1998-013, :on 980701,IST Valve Surveillances Were Missed. Caused by Inadequate Processing of Info Transferred Between Operations Procedure Group & Programs Engineering.Procedure Revised (← links)
- 05000382/LER-1996-015, :on 961101,noted That Containment Penetration 20 Was Not Totally Isolated During Maint on Valve CC-808A. Caused by Personnel Error.Issued Ltr W3B1-96-0083 Re TS 3.6.3 to All Licensed Personnel & Revised CCW Drawings (← links)
- 05000278/LER-1998-002-02, :on 980504,failure to Meet TS for Rcic,Was Revealed.Caused by Incomplete Procedural Guidance.Various Components Including Trip Tappet,Head Lever & Tappet Guide Were Replaced (← links)
- 05000277/LER-1998-004-01, :on 980606,failure to Meet TS for off-site Source,Was Determined.Caused by Lightning Strike & No Positive Verification That Tap Changer Was operational.3SU Tap Changer Circuitry Was Repaired,Tested & Returned to Svc (← links)
- 05000213/LER-1987-017, :on 871023,fire Watch Left Post Before Svc Water Pump Water Curtain Sys Returned to Svc.Caused by Personnel Error.Review of Incident for Lessons Learned & Upgrades to Station Training Program Performed (← links)
- 05000369/LER-1998-004-02, :on 980619,discovered Missed Auxiliary Hoist Surveillance Prior to Rod Drive Latching.Caused by Inadequate Work Practices.Suspended Drive Rod Latching, Completed Load Test & Resumed Drive Rod Latching (← links)
- 05000423/LER-1998-033, :on 980610,manual ESF Actuation of Motor Driven Auxiliary FW Pumps Was Noted.Caused by Trip of Motor Driven SG FW Pump.Motor Driven FW Pump Impeller Was Replaced (← links)
- 05000259/LER-1987-028-01, :on 871008,unplanned Containment Isolations Occurred.Caused by Inadequate Procedures.Radiation Monitoring Sys & Alarm Response Procedures Revised (← links)
- 05000289/LER-1986-013, :on 861107,failure Declared on as-found Reactor Bldg Integrated Leak Rate Test.Caused by Leakage from Bldg Purge Exhaust Valve Interspace.Second Test Performed & Resultant as-left Bldg Leak Rate Acceptable (← links)
- 05000277/LER-1989-003-01, :on 890207,group 2C Primary Containment Isolation Sys Valve Isolation Occurred Resulting in motor- Operated Feedwater Flush Valves Receiving Signals to Close. Caused by Stated Inadvertent Signals (← links)
- 05000213/LER-1987-008, :on 870625,control Rod 31 Dropped Into Core & Overfeed to Steam Generator 2 Occurred.Caused by Faulty Fuse & Inadequate Maint Procedure,Respectively.Fuse Replaced & Procedure Revised (← links)
- 05000346/LER-1987-011, :on 870906,reactor Tripped from Power Level of 104.5 % High Flux Reactor Sys Signal.On 870907,two Attempts to Place Decay Heat Loop 2 in Svc Resulted in Pressurizer Level Drops of 10 & 6 Inches,Respectively (← links)
- 05000313/LER-1988-009, :on 880922,three Inoperable Snubbers Discovered on safety-related Piping Sys.One Snubber Failed Due to Spec of Undersized Snubber & Other Two Found W/Inadequate Travel Remaining for Thermal Growth (← links)
- 05000321/LER-1989-001-01, :on 890224,isolation of Group 5 Primary Containment Isolation Sys Occurred.Caused by Rapid Filling of Sys Piping When Pump Suction Valve Opened.Procedures Revised (← links)
- 05000260/LER-1988-016-01, :on 881209,unplanned Manual Start of RHR Pump Occurred.Caused by Personnel Error.Labeling of RHR Local Controls Will Be Corrected & Licensed Personnel Will Review Event (← links)
- 05000321/LER-1987-015-01, :on 870827 & 28,main Control Room Environ Control Sys Actuated on Signal from Refueling Floor Area Radiation Monitor,Resulting in 870827 Pressurization.Caused by Faulty Gm Tube.Tube Replaced (← links)
- 05000341/LER-1989-004, :on 890118,HPCI Inoperable Due to Isolation Logic Functioning W/Nonconservative Trip Valve.Caused by Equipment Failure of Master Trip Unit (Rosemont 710 DU) E41-N657A.Instrument Repaired (← links)
- 05000336/LER-1987-004, :on 870202 & 0208,automatic Actuations of Emergency Safeguards Actuation Sys Resulted in Containment Purge Valve Isolations.Caused by Broken Window on Beta Scintillation Detector.Detector Replaced (← links)
- 05000312/LER-1987-033, :on 870529,11 Hourly Fire Watches Required by Tech Specs Missed.Caused by Unexpected Demand on Available Manpower Due to Breakdown in Security Computer Sys.Fire Watch Pool Will Be Established (← links)
- 05000312/LER-1987-030, :on 870529,due to Concurrent Work on Radiation Monitors R15049 & R15050,number of Operable Channels to Trip Reactor Bldg Purge Sys Reduced to Zero.Caused by Cognitive Personnel Error.Personnel Trained (← links)
- 05000334/LER-1997-022, :on 970730,ESFA of P-12 Interlock Occurred Due to Decreased Reactor Water Temp.Caused by Operator Unfamiliarity W/Level Controller Response in All Situations. Controller Windup Will Be Demonstrated (← links)
- 05000302/LER-1997-024, :on 970731,feedwater Valves Did Not Meet Requirements for Main Steam Line or Feedwater Line Break Event Mitigation.Caused by Inadequate Design & Calculation Errors.Fsar Will Be Updated by 971130 (← links)
- 05000425/LER-1998-002-01, :on 980311,evaluation Determined That as-found lug-to-post Connection Represented Condition Outside of Design Basis,Per 10CFR50.72(b)(1)(ii)(B).Caused by Cognitive Personnel Error.Nut Placed on Terminal Post (← links)
- 05000425/LER-1998-001-04, :on 980308,personnel Noticed Discrepancies Between Demand Position Step Counters & Digital Rod Position Indicators.Caused by Rod Control Firing Card Operating Abnormally.Firing Card Replaced (← links)
- 05000266/LER-1998-008, :on 980203,EDG Air Start Motor Solenoid Valves W/Spring Not in Accordance W/Design Occurred.Caused by Use of 275 Psig Solenoid Valve Which Does Not Meet Minimum DC Voltage Available.Solenoid Valves Modified (← links)
- 05000382/LER-1998-004, :on 980304,TS 4.0.3 Condition - CPC Channel Functional Test,Was Concluded from Preliminary CEOG Rept. Caused by Human Error.Cpc Channels A,B & C Were Satisfactorily Tested (← links)
- 05000382/LER-1998-003, :on 980302,inoperable Hydrogen Analyzers Were Noted Due to Undersized Thermal Overloads.Engineering Personnel Conducted all-hands Meetings to Discuss Management Expectations for Verifying Critical Design Inputs (← links)
- 05000354/LER-1997-022, :on 970910,unplanned Manual Scram Occurred Due to Relay Malfunction in a Phase Main Generator step-up Transformer.Sampled & Tested Oil in Main Steam Generators & Replaced Cooling Fan Control Circuit Relays (← links)
- 05000266/LER-1998-011, :on 980214,missed TS Surveillance of Radiation Monitor Prior to Discharge Occurred.Caused by Failure to Adhere to Procedures Based on Failure to Recognize.Thorough Root Cause Evaluation Performed (← links)
- 05000255/LER-1998-005, :on 980217,actuation of Containment Isolation Occurred.Caused by Inadvertent Containment High Radiation Signal.Plant Status Evaluated & Equipment Lineups Restored (← links)
- 05000482/LER-1993-012, :on 930510,reported Unusual Noise Due to Small Frictional Force Release in RCS During heat-up.Implemented Thermal Expansion Monitoring Program in Refuel Viii to Aid in Identification of Locations of Restraint on RCS (← links)
- 05000413/LER-1998-003-01, :on 980218,omission in Retest Manual Leads to Failure to Perform Required Retest Prior to Restoring Ci Valves to Svc.Retest Manual Will Be Updated to Reflect Specific TS Requirements for Ci Valves (← links)
- 05000281/LER-1999-004-02, :on 981109,EDG Was Inoperable Longer than Allowed by TS Due to Governor Compensation Valve.Root Cause Evaluation Being Performed to Determine How Compensation Valve Became Closed (← links)
- 05000364/LER-1998-001-05, :on 980328,manual Reactor Trip Due to Dropped Control Rod K-2,was Determined.Caused by Overcurrent Condition.Crdm Cable & Connectors Associated W/Rod K-2 Will Be Replaced & Rod Will Be Tested During Startup Testing (← links)
- 05000413/LER-1998-004-01, :on 980216,missed TS Surveillance on CR Area Ventilation Sys Actuation Instrumentation Noted.Caused by Incorrect Mode Specification Requirements in Affected Ts. Submitted License Amend & Verified TS Are Met (← links)
- 05000325/LER-1999-008, :on 990809,electric Motor Driven & Diesel Driven Fire Pump Concurrent Inoperability Occurred.Caused by Human Performance Error.Diesel Fire Pump Jacket Water Temp Switch Replaced.With (← links)
- 05000338/LER-1999-006-01, :on 990904,potential for Safegurads Exhaust Flow to Bypass Charcoal Filter,Was Discovered.Caused by Degraded Damper.Plant Issue Rept Submitted for B Train of Savs Flow Rate.With (← links)
- 05000354/LER-1998-001-03, :on 980213,missed HPCI Resulted in Unavailability of Hpci.Caused by Personnel Error.Reactivated Recurring Tasks & Successfully Performed Surveillance Testing (← links)
- 05000382/LER-1998-007, :on 980317,discovered That No Allowance for Instrument Loop Uncertainity Included in Surveillance for Chilled Water Outlet Temp.Caused by Failure to Consider Instrument Loop Uncertainty.Revised Task (← links)
- 05000382/LER-1998-006, :on 980306,increased Differential Pressure for Feedwater Isolation Valves Occurred.Caused by Failure to Consider All Pressure Source Affecting Mfivs.Admin Controls Have Been Enacted Requiring Entry Into TS 3.6.3 (← links)
- 05000302/LER-1998-003, :on 980211,loss of Power to Integrated Control Sys Occurred.Caused by Zener Diode Not Adequately Soldered to Printed Circuit Board Trace for Power Supply Monitor. FPC Replaced ICS Power Supply Monitor (← links)
- 05000245/LER-1997-033-01, :on 970801,unmonitored Airborne Radioactivity Release Paths Were Discovered.Caused by Lack of Adequate Monitoring Program.Placed Low Vol Air Samplers at Areas in Question (← links)
- 05000412/LER-1997-004-01, :on 970911,discovered That Four Containment Isolation Valves Were Not Tested IAW Ts.Caused by Inadequate Mgt Change.Will Revise Licensing Requirements Manual Table 5.1-1 & UFSAR Table 6.2-60 (← links)
- 05000298/LER-1987-016, :on 870526,unplanned Automatic Startup of Both Diesel Generators Occurred Due to Momentary Undervoltage Condition.Possibly Caused by Lightning Strike on 69kV Emergency Transformer.Generators Restored (← links)