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PNO-IV-99-037, on 990822,Region IV Dispatched Inspector to STP to Relieve Resident Inspectors & to Provide Assistance to STP Nuclear Operating Co,In Anticipation of Hurricane Bret.Representative Was Also Dispatched to FEMA Region VI23 August 1999PNO-IV-99-037:on 990822,Region IV Dispatched Inspector to STP to Relieve Resident Inspectors & to Provide Assistance to STP Nuclear Operating Co,In Anticipation of Hurricane Bret.Representative Was Also Dispatched to FEMA Region VI
PNO-IV-97-054, on 971006,premature Lifting of Main Turbine Moisture Separator Reheater Relief Valve Occurred.Licensee Removed Main Turbine Generator from Svc to Repair Relief Valve.Individual Transported Offsite Via Site Ambulance6 October 1997PNO-IV-97-054:on 971006,premature Lifting of Main Turbine Moisture Separator Reheater Relief Valve Occurred.Licensee Removed Main Turbine Generator from Svc to Repair Relief Valve.Individual Transported Offsite Via Site Ambulance
PNO-IV-97-012, on 970222,licensee Transported Potentially Contaminated Individual to Matagorda General Hosp.Individual Received Laceration on Forehead & Another at Lips.State of Tx Will Be Informed24 February 1997PNO-IV-97-012:on 970222,licensee Transported Potentially Contaminated Individual to Matagorda General Hosp.Individual Received Laceration on Forehead & Another at Lips.State of Tx Will Be Informed
PNO-IV-93-033, on 931029,contractor Employee Suffered Heart Attack at Site Outside Protected Area.Employee Transported to Local Hosp Where He Later Died.State of Tx Informed1 November 1993PNO-IV-93-033:on 931029,contractor Employee Suffered Heart Attack at Site Outside Protected Area.Employee Transported to Local Hosp Where He Later Died.State of Tx Informed
PNO-IV-93-003, on 930203,Unit 2 Tripped from Full Power on low-low Steam Generator Level Resulting in turbine-driven Auxiliary Feedwater Pump 24 Trip on Mechanical Overspeed. Cause Not Determined.Reactor Stabilized in Mode 34 February 1993PNO-IV-93-003:on 930203,Unit 2 Tripped from Full Power on low-low Steam Generator Level Resulting in turbine-driven Auxiliary Feedwater Pump 24 Trip on Mechanical Overspeed. Cause Not Determined.Reactor Stabilized in Mode 3Boric Acid
PNO-IV-93-001, on 930112,NOUE Declared as Result of Commencing Reactor Shutdown Due to TS 3.0.3 Requirements. Caused by Inoperable Compensated Low Steam Line Pressure. Licensee Issued Press Release.State of Tx Informed13 January 1993PNO-IV-93-001:on 930112,NOUE Declared as Result of Commencing Reactor Shutdown Due to TS 3.0.3 Requirements. Caused by Inoperable Compensated Low Steam Line Pressure. Licensee Issued Press Release.State of Tx Informed
PNO-IV-91-013, on 910502,secretary of Licensee Security Manager Inadvertently Admitted Loaded Derringer Into Protected Area as She Entered Site on 910502.Employee Later Remembered Weapon in Purse & Reported Event to Security2 May 1991PNO-IV-91-013:on 910502,secretary of Licensee Security Manager Inadvertently Admitted Loaded Derringer Into Protected Area as She Entered Site on 910502.Employee Later Remembered Weapon in Purse & Reported Event to Security
PNO-IV-90-034, on 900929,Unit 1 Manually Tripped & Will Remain Shutdown to Allow Repairs to Bellows in Low Pressure Turbine.Unit 2 Entered First Refueling Outage1 October 1990PNO-IV-90-034:on 900929,Unit 1 Manually Tripped & Will Remain Shutdown to Allow Repairs to Bellows in Low Pressure Turbine.Unit 2 Entered First Refueling Outage
PNO-IV-90-030, on 900910,licensee Declared Unusual Event W/ Reactor at 100% Thermal Power & Reactor Shut Down.Also on 900909,inverter Declared Out of Svc Following Unexpected Trip.No Cause Found.Troubleshooting Continuing10 September 1990PNO-IV-90-030:on 900910,licensee Declared Unusual Event W/ Reactor at 100% Thermal Power & Reactor Shut Down.Also on 900909,inverter Declared Out of Svc Following Unexpected Trip.No Cause Found.Troubleshooting Continuing
PNO-IV-90-025, on 900716,Unit 1 Tripped from 100% Power During Operational Test of Reactor Trip Breaker Trip Actuating Device Which Forced Outage to Exceed 72 H.State of Tx Informed.No Press Release Issued17 July 1990PNO-IV-90-025:on 900716,Unit 1 Tripped from 100% Power During Operational Test of Reactor Trip Breaker Trip Actuating Device Which Forced Outage to Exceed 72 H.State of Tx Informed.No Press Release Issued
PNO-IV-90-024, on 900628,Steam Generator D PORV Found to Have Congealed Electro Hydraulic Control Fluid.Caused by Heat & Moisture from body-to-bonnet Steam Leak on Porv.Reactor Shut Down6 July 1990PNO-IV-90-024:on 900628,Steam Generator D PORV Found to Have Congealed Electro Hydraulic Control Fluid.Caused by Heat & Moisture from body-to-bonnet Steam Leak on Porv.Reactor Shut Down
PNO-IV-89-051A, on 890814,radioactive Contamination Found Outside Radiation Controlled Area in Stairwell of Mechanical Auxiliary Bldg & on 890817,contamination Found in 11A Mab Chiller Open Cooling Sys Discharge Drain.Events Unrelated18 August 1989PNO-IV-89-051A:on 890814,radioactive Contamination Found Outside Radiation Controlled Area in Stairwell of Mechanical Auxiliary Bldg & on 890817,contamination Found in 11A Mab Chiller Open Cooling Sys Discharge Drain.Events Unrelated
PNO-IV-89-051, radioactive Contamination Outside Radiation Controlled Area Discovered.Apparent Cause Associated W/Operation of Radwaste Evaporator.No Contamination Found in Neutralization Basin & No Personnel Contaminated15 August 1989PNO-IV-89-051:radioactive Contamination Outside Radiation Controlled Area Discovered.Apparent Cause Associated W/Operation of Radwaste Evaporator.No Contamination Found in Neutralization Basin & No Personnel Contaminated
PNO-IV-89-048, on 890713,main Transformer 2A Locked Out Due to Transformer Bursting,Causing Mineral Oil to Spill Into Transformer Oil in Recovery Pit.Caused by Loss of Power to Auxiliary Bus.Unit Will Not Be Restarted for 2 to 3 Days14 July 1989PNO-IV-89-048:on 890713,main Transformer 2A Locked Out Due to Transformer Bursting,Causing Mineral Oil to Spill Into Transformer Oil in Recovery Pit.Caused by Loss of Power to Auxiliary Bus.Unit Will Not Be Restarted for 2 to 3 Days
PNO-IV-89-033, on 890512,unusual Event Declared When Two of Four Pressurizer Water Level Indication Channels Inoperable. Reactor Shutdown.Possibly Caused by Valve Disc Stuck on Valve Seat.Insulation Installed on Piping15 May 1989PNO-IV-89-033:on 890512,unusual Event Declared When Two of Four Pressurizer Water Level Indication Channels Inoperable. Reactor Shutdown.Possibly Caused by Valve Disc Stuck on Valve Seat.Insulation Installed on PipingTemporary Modification
PNO-IV-89-026, on 890405,unit Tripped from 11% Power Due to Lockout of Main & Auxiliary Transformers During Attempt to Synchronize Main Generator to Electrical Distribution Sys. Unit in Hot Standby & Startup Not Expected Until 8904096 April 1989PNO-IV-89-026:on 890405,unit Tripped from 11% Power Due to Lockout of Main & Auxiliary Transformers During Attempt to Synchronize Main Generator to Electrical Distribution Sys. Unit in Hot Standby & Startup Not Expected Until 890409
PNO-IV-89-025, on 890406,util Declared Notification of Unusual Event at Facility Due to One Inoperable Diesel Generator.Util Declared Diesel Generator 12 Operable After Replacing Defective Resistor in Governor Control Circuit6 April 1989PNO-IV-89-025:on 890406,util Declared Notification of Unusual Event at Facility Due to One Inoperable Diesel Generator.Util Declared Diesel Generator 12 Operable After Replacing Defective Resistor in Governor Control Circuit
PNO-IV-89-024, on 890405,reactor Trip Occurred During Attempt to Synchronize Main Generator to Electrical Distribution Sys.Some Nonsafety Equipment Did Not Function as Expected. Resident Inspectors Will Continue to Monitor Activities5 April 1989PNO-IV-89-024:on 890405,reactor Trip Occurred During Attempt to Synchronize Main Generator to Electrical Distribution Sys.Some Nonsafety Equipment Did Not Function as Expected. Resident Inspectors Will Continue to Monitor Activities
PNO-IV-89-022, on 890328,reactor Power Increased Above 5% for First Time.License Issued Earlier Authorizing Full Power Operation.Power to Be Increased in Increments for Few Wks W/Performance of Equipment & Sys Tests at Various Levels30 March 1989PNO-IV-89-022:on 890328,reactor Power Increased Above 5% for First Time.License Issued Earlier Authorizing Full Power Operation.Power to Be Increased in Increments for Few Wks W/Performance of Equipment & Sys Tests at Various Levels
PNO-IV-89-020, Region IV Notified of Recent Reactor Trip at Palo Verde Unit 3 That Was Complicated by Inability to Open Steam Generator Atmospheric Dump Valves Mfg by Control Components,Inc.No Sticking Problems Noted at Other Plants23 March 1989PNO-IV-89-020:Region IV Notified of Recent Reactor Trip at Palo Verde Unit 3 That Was Complicated by Inability to Open Steam Generator Atmospheric Dump Valves Mfg by Control Components,Inc.No Sticking Problems Noted at Other Plants
PNO-IV-89-019, on 890315,util Received Allegations Re Util Incompetence & Mismanagement Re Const Costs & Plant Operation.Region IV Formed Multidisciplined Team to Identify Safety Issues.Util Also Conducting Investigation16 March 1989PNO-IV-89-019:on 890315,util Received Allegations Re Util Incompetence & Mismanagement Re Const Costs & Plant Operation.Region IV Formed Multidisciplined Team to Identify Safety Issues.Util Also Conducting Investigation
PNO-IV-89-016, on 890312,initial Criticality Achieved.Region IV Operational Readiness Review Insp Team on Site for First Days of Low Power Operation.Commission Meeting on Full Power License Scheduled for 89032813 March 1989PNO-IV-89-016:on 890312,initial Criticality Achieved.Region IV Operational Readiness Review Insp Team on Site for First Days of Low Power Operation.Commission Meeting on Full Power License Scheduled for 890328
PNO-IV-89-013, on 890120,manual Turbine/Generator Trip Initiated When Hydrogen Fueled Fire Occurred in Main Generator.Testing Revealed That Wall Thickness of Bottom Mounted Instrumentation Thimble Tubes Below Requirement2 March 1989PNO-IV-89-013:on 890120,manual Turbine/Generator Trip Initiated When Hydrogen Fueled Fire Occurred in Main Generator.Testing Revealed That Wall Thickness of Bottom Mounted Instrumentation Thimble Tubes Below Requirement
PNO-IV-88-078, on 880923,util Plans to Begin Scheduled Outage to Inspect Bottom Mounted Instrument (Bmi) Tubes.On 880506, Util Reported That Review of Eddy Current Test Data on 58 Bmi Thimble Tubes Revealed Wear on 19 Thimble Tubes23 September 1988PNO-IV-88-078:on 880923,util Plans to Begin Scheduled Outage to Inspect Bottom Mounted Instrument (Bmi) Tubes.On 880506, Util Reported That Review of Eddy Current Test Data on 58 Bmi Thimble Tubes Revealed Wear on 19 Thimble Tubes
PNO-IV-88-072, on 880830,shutdown Began from Approx 45% Power to Repair Main Steam Vent Line Leak Coming from a Sock Weld. Licensee Will Insp Similar Socket Welds on Main Steam & Main Feed Lines Inside Containment During Shutdown30 August 1988PNO-IV-88-072:on 880830,shutdown Began from Approx 45% Power to Repair Main Steam Vent Line Leak Coming from a Sock Weld. Licensee Will Insp Similar Socket Welds on Main Steam & Main Feed Lines Inside Containment During Shutdown
PNO-IV-88-069, on 880824,util 100 H NSSS Acceptance Test Completed.Upon Completion of Review of Startup Test Results by Plant Operations Review Committee,Util Will Be in Position to Begin Commercial Operation.State of Tx Informed24 August 1988PNO-IV-88-069:on 880824,util 100 H NSSS Acceptance Test Completed.Upon Completion of Review of Startup Test Results by Plant Operations Review Committee,Util Will Be in Position to Begin Commercial Operation.State of Tx Informed
PNO-IV-88-066, on 880812,Region IV Notified of Truck Accident on Interstate 10,approx 30 Miles West of Baton Rouge.Truck Carrying Eight New Fuel Assemblies to Facility.Shipping Packages Undamaged.Packages Returned to State of Sc12 August 1988PNO-IV-88-066:on 880812,Region IV Notified of Truck Accident on Interstate 10,approx 30 Miles West of Baton Rouge.Truck Carrying Eight New Fuel Assemblies to Facility.Shipping Packages Undamaged.Packages Returned to State of Sc
PNO-IV-88-060, on 880728,licensee Tripped Reactor from 100% Power as Part of Planned 100% Power Plateau Initial Startup Test Program.Preliminary Results Satisfactory.Unit Will Remain in Hot Shutdown for Repairs28 July 1988PNO-IV-88-060:on 880728,licensee Tripped Reactor from 100% Power as Part of Planned 100% Power Plateau Initial Startup Test Program.Preliminary Results Satisfactory.Unit Will Remain in Hot Shutdown for Repairs
PNO-IV-88-051, failure of Westinghouse DS-416 Electrical Breakers.Failures Could Be Generic Problem.Westinghouse Representatives on Site Observing Testing,Insp & Installation of Subj Breakers16 June 1988PNO-IV-88-051:failure of Westinghouse DS-416 Electrical Breakers.Failures Could Be Generic Problem.Westinghouse Representatives on Site Observing Testing,Insp & Installation of Subj Breakers
PNO-IV-88-050, on 880613,Unit 1 Startup Following 880525 Shutdown Initiated.Subj Notification Issued as Plant Status Update.Maint Activities Performed During Outage.Completion of Testing at 30% Plateau Scheduled for 88061914 June 1988PNO-IV-88-050:on 880613,Unit 1 Startup Following 880525 Shutdown Initiated.Subj Notification Issued as Plant Status Update.Maint Activities Performed During Outage.Completion of Testing at 30% Plateau Scheduled for 880619
PNO-IV-88-046, on 880525,steam-driven Main Feedwater Pump Failed.Licensee Preparing to Inspect Main Condenser for Damage.Repairs Should Take Several Days.No One Injured from Flying Debris.Facility Will Remain Shutdown26 May 1988PNO-IV-88-046:on 880525,steam-driven Main Feedwater Pump Failed.Licensee Preparing to Inspect Main Condenser for Damage.Repairs Should Take Several Days.No One Injured from Flying Debris.Facility Will Remain Shutdown
PNO-IV-88-045, on 880521,plant Startup Followed Extended Outage for Performance of Maint Work.Completion of Testing at 30% Plateau Scheduled for 880526.Upon Satisfactory testing,50% Plateau Will Commence on 88052723 May 1988PNO-IV-88-045:on 880521,plant Startup Followed Extended Outage for Performance of Maint Work.Completion of Testing at 30% Plateau Scheduled for 880526.Upon Satisfactory testing,50% Plateau Will Commence on 880527
PNO-IV-88-039, on 880506,review of Eddy Current Test Data Revealed Wear on 19 Thimble Tubes.Caused by Flow Induced Vibrations.Util Expecting Recommendation for Corrective Action from Westinghouse9 May 1988PNO-IV-88-039:on 880506,review of Eddy Current Test Data Revealed Wear on 19 Thimble Tubes.Caused by Flow Induced Vibrations.Util Expecting Recommendation for Corrective Action from WestinghouseFlow Induced Vibration
PNO-IV-88-036, util Begun 2 to 3-wk Maint Outage.Startup Testing Completed on 30% Power Testing Plateau.Licensee Also Plans to Replace Corroded Aluminum Bronze Fittings & Valves in Essential Cooling Water Sys.State of Tx Informed4 May 1988PNO-IV-88-036:util Begun 2 to 3-wk Maint Outage.Startup Testing Completed on 30% Power Testing Plateau.Licensee Also Plans to Replace Corroded Aluminum Bronze Fittings & Valves in Essential Cooling Water Sys.State of Tx InformedThrough Wall Leak
Flow Induced Vibration
PNO-IV-88-030, on 880418,Train a Control Room Ventilation Makeup Supply Damper Failed to Close During Surveillance. Licensee Repaired Failed Damper & Plant Returned to Power Escalation from 13% Power18 April 1988PNO-IV-88-030:on 880418,Train a Control Room Ventilation Makeup Supply Damper Failed to Close During Surveillance. Licensee Repaired Failed Damper & Plant Returned to Power Escalation from 13% Power
PNO-IV-88-024, on 880330,reactor Trip & Safety Injection Occurred Due to Loss of Offsite Power.Caused by Troubleshooting Work on Main Generator Control Circuits to Determine Cause of Main Generator Output Breaker Trip31 March 1988PNO-IV-88-024:on 880330,reactor Trip & Safety Injection Occurred Due to Loss of Offsite Power.Caused by Troubleshooting Work on Main Generator Control Circuits to Determine Cause of Main Generator Output Breaker Trip
ML20148G17117 March 1988PNS-IV-88-001:on 880316,telephone Threat Against Util & Plant Received at Corporate Ofc in Houston,Tx.Caller Stated That Two Power Poles Had Been Cut Down.Util Confirmed That Two Poles Had Been Cut Down.Contingency Plans Implemented
PNO-IV-88-018, on 880301,local Business Agents for Const Electricians & Pipefitters Stopped Supervision of Field Work.Work Supervised by Nonmanual & Supervisory Personnel. Law Enforcement Authorities Notified Due to Fights2 March 1988PNO-IV-88-018:on 880301,local Business Agents for Const Electricians & Pipefitters Stopped Supervision of Field Work.Work Supervised by Nonmanual & Supervisory Personnel. Law Enforcement Authorities Notified Due to Fights
PNO-IV-88-016, on 880228,reactor Trip Occurred W/Control Rods Positioned for Initial Criticality & Boron Dilution Was in Progress.Caused by Spurious Signal from Loop 3 lo-lo Temp Cold.Test Procedures Modified to Restart Testing29 February 1988PNO-IV-88-016:on 880228,reactor Trip Occurred W/Control Rods Positioned for Initial Criticality & Boron Dilution Was in Progress.Caused by Spurious Signal from Loop 3 lo-lo Temp Cold.Test Procedures Modified to Restart Testing
PNO-IV-87-060, on 871122,auxiliary Feed Sys Vibration Resulting in Pipe Failure Occurred.Occurrence Will Impact Startup Schedule.Licensee Investigating Failure & NRC Monitoring Activities23 November 1987PNO-IV-87-060:on 871122,auxiliary Feed Sys Vibration Resulting in Pipe Failure Occurred.Occurrence Will Impact Startup Schedule.Licensee Investigating Failure & NRC Monitoring Activities
PNO-IV-87-045, on 870913,two of Six Seismic Monitors Recorded Deflation of About 0.01 G & Alarmed.Licensee Contacted Regional & Natl Seismic Monitoring Stations.Insp Shows No Evidence of Damage14 September 1987PNO-IV-87-045:on 870913,two of Six Seismic Monitors Recorded Deflation of About 0.01 G & Alarmed.Licensee Contacted Regional & Natl Seismic Monitoring Stations.Insp Shows No Evidence of Damage
PNO-IV-87-043, on 870903,fire Occurred in Auxiliary Transformer & Switchgear Room 13.8 Kv Busing.Investigation Underway to Determine Cause of Electrical Fault & Resulting Fire4 September 1987PNO-IV-87-043:on 870903,fire Occurred in Auxiliary Transformer & Switchgear Room 13.8 Kv Busing.Investigation Underway to Determine Cause of Electrical Fault & Resulting Fire
PNO-IV-87-040, on 870828,painter Working in Unit 1 Turbine Bldg Injured from Fall of Approx 25 Ft.Painter Transported to Matagorda General Hosp & Then to St Lukes Hosp in Houston28 August 1987PNO-IV-87-040:on 870828,painter Working in Unit 1 Turbine Bldg Injured from Fall of Approx 25 Ft.Painter Transported to Matagorda General Hosp & Then to St Lukes Hosp in Houston
PNO-IV-87-023, on 870430,const Craftsman Fell 30 Ft from Ladder & Suffered Broken Elbow & Concussion.Another Man Onsite Found Dead of Heart Attack30 April 1987PNO-IV-87-023:on 870430,const Craftsman Fell 30 Ft from Ladder & Suffered Broken Elbow & Concussion.Another Man Onsite Found Dead of Heart AttackFatality
PNO-IV-87-010, on 870317,plant Experienced Failure of Circulating Water Pump Pedestal Casing.Piece of Pedestal Casing Blown Out by Water Pressure Rendering Pump Inoperable.Licensee Assessing Damage & Cause of Event18 March 1987PNO-IV-87-010:on 870317,plant Experienced Failure of Circulating Water Pump Pedestal Casing.Piece of Pedestal Casing Blown Out by Water Pressure Rendering Pump Inoperable.Licensee Assessing Damage & Cause of Event
PNO-IV-87-009A, on 870311,steam/water Hammer Event Occurred in Component Cooling Water Lines Servicing RHR HX Trains B & C.Caused by Operational Errors.After Cooldown from Hot Functional Testing,Sys Damage Will Be Repaired13 March 1987PNO-IV-87-009A:on 870311,steam/water Hammer Event Occurred in Component Cooling Water Lines Servicing RHR HX Trains B & C.Caused by Operational Errors.After Cooldown from Hot Functional Testing,Sys Damage Will Be Repaired
PNO-IV-87-009, on 870311,steam/water Hammer Event Occurred in Component Cooling Water Lines Servicing RHR HX Trains B & C. Caused by Operator Overlooking Step in Procedure.All Hot Functional Testing Put on Hold Pending Evaluation13 March 1987PNO-IV-87-009:on 870311,steam/water Hammer Event Occurred in Component Cooling Water Lines Servicing RHR HX Trains B & C. Caused by Operator Overlooking Step in Procedure.All Hot Functional Testing Put on Hold Pending Evaluation
ML20207P83915 January 1987PNS-IV-87-001:during pre-hot Functional Test Insp of Reactor Coolant Pumps,Licensee Discovered 14-inch Metal Spike Inserted Between Rotor & Stator of Loop C.Formal Access Control Established.Insp for Addl Tamperings in Progress
PNO-IV-87-004, on 870114,licensee Discovered Problem W/One Diesel Generator While Performing 24 H Preoperational Test. Caused by Stuck Intake Valve Push Rod.Diesel Generator Shutdown & Repaired by Licensee14 January 1987PNO-IV-87-004:on 870114,licensee Discovered Problem W/One Diesel Generator While Performing 24 H Preoperational Test. Caused by Stuck Intake Valve Push Rod.Diesel Generator Shutdown & Repaired by Licensee
PNO-IV-86-034, on 861031,foam Suppression Sys for Emergency Diesel Generator 13 Fuel Oil Storage Tank Room Manually Activated & on 861111,nitrogen Sys for 365-kV - 13.8-kV Standby Transformer Found Overpressurized12 November 1986PNO-IV-86-034:on 861031,foam Suppression Sys for Emergency Diesel Generator 13 Fuel Oil Storage Tank Room Manually Activated & on 861111,nitrogen Sys for 365-kV - 13.8-kV Standby Transformer Found Overpressurized
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