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	Issue date	Title	Topic
PNO-IV-99-043, on 991016,earthquake of Magnitude 7 Occurred. Plant Operations Were Not Disrupted.Unusual Event Classifications Were Exited within 1 H at Both Facilities.No Damage Was Indicated & No Residual Plant Effects Observed	18 October 1999	PNO-IV-99-043:on 991016,earthquake of Magnitude 7 Occurred. Plant Operations Were Not Disrupted.Unusual Event Classifications Were Exited within 1 H at Both Facilities.No Damage Was Indicated & No Residual Plant Effects Observed	Earthquake
PNO-IV-99-018, on 990305,declared SONGS Units 2 & 3 Alert Because Potential Bomb Threat Occurred.Device Was 12-inch long,2-inch Diameter Copper Pipe,With Both Ends Capped. Licensee Notified State & Local Officials	5 March 1999	PNO-IV-99-018:on 990305,declared SONGS Units 2 & 3 Alert Because Potential Bomb Threat Occurred.Device Was 12-inch long,2-inch Diameter Copper Pipe,With Both Ends Capped. Licensee Notified State & Local Officials
PNO-IV-98-041, on 980918,control Room Operators Observed Alarm on One Channel of Main Condenser Steam Jet Air Ejector Radiation Monitoring Equipment,Which Indicated That Activity of Condenser Exhaust Had Increased by About Two Decades	18 September 1998	PNO-IV-98-041:on 980918,control Room Operators Observed Alarm on One Channel of Main Condenser Steam Jet Air Ejector Radiation Monitoring Equipment,Which Indicated That Activity of Condenser Exhaust Had Increased by About Two Decades
PNO-IV-97-038, on 970629,Unit 2 Entered Mode 3 & Mode 4 in Preparation for Draining to Midloop.Two Charging Lines to RCS Did Not Have Balanced Flow.Same Valve Was Found to Be Partially Stuck Closed in Units 2 & 3.Plant Shutdowned	30 June 1997	PNO-IV-97-038:on 970629,Unit 2 Entered Mode 3 & Mode 4 in Preparation for Draining to Midloop.Two Charging Lines to RCS Did Not Have Balanced Flow.Same Valve Was Found to Be Partially Stuck Closed in Units 2 & 3.Plant Shutdowned
PNO-V-93-020, on 931118,eddy Current Insp of Tubes Identified Potential Loose Parts in Four Locations in SG 88 & Three Locations in SG 89.Licensee Evaluating Source of Loose Parts	18 November 1993	PNO-V-93-020:on 931118,eddy Current Insp of Tubes Identified Potential Loose Parts in Four Locations in SG 88 & Three Locations in SG 89.Licensee Evaluating Source of Loose Parts
PNO-V-91-016, on 910808,transmitter on Volume Control Tank Failed.Level Transmitter Repaired.Licensee Conducting Confirmatory Testing of Transmitter	9 August 1991	PNO-V-91-016:on 910808,transmitter on Volume Control Tank Failed.Level Transmitter Repaired.Licensee Conducting Confirmatory Testing of Transmitter
PNO-V-91-014, on 910715,licensee Inadvertently Drained 7,000 Gallons of Water from Spent Fuel Pool.Caused by Procedural Weakness.Health Physics Personnel Surveyed Area & Found Min Activity.Util Currently Removing Water from Radwaste Bldg	16 July 1991	PNO-V-91-014:on 910715,licensee Inadvertently Drained 7,000 Gallons of Water from Spent Fuel Pool.Caused by Procedural Weakness.Health Physics Personnel Surveyed Area & Found Min Activity.Util Currently Removing Water from Radwaste Bldg
PNO-V-90-047B, updates 901120 Occurrence of Inadvertent Actuation of Safety Injection & Containment Spray Sys	23 November 1990	PNO-V-90-047B:updates 901120 Occurrence of Inadvertent Actuation of Safety Injection & Containment Spray Sys
PNO-V-90-047A, on 901120,updates Occurrence of Inadvertent Actuation of Safety Injection & Containment Spray Sys	21 November 1990	PNO-V-90-047A:on 901120,updates Occurrence of Inadvertent Actuation of Safety Injection & Containment Spray Sys
PNO-V-90-047, on 901120,actuation Signal Initiated by Plant Protection Sys While Testing PPS Channel	20 November 1990	PNO-V-90-047:on 901120,actuation Signal Initiated by Plant Protection Sys While Testing PPS Channel
PNO-V-90-036, on 900910,small Amount of Contamination Found on Injured Worker Clothing During Transport to Hosp. Contaminated Clothing Removed Enroute to Hosp & Injuries to Worker Considered Minor.No Press Release Planned	10 September 1990	PNO-V-90-036:on 900910,small Amount of Contamination Found on Injured Worker Clothing During Transport to Hosp. Contaminated Clothing Removed Enroute to Hosp & Injuries to Worker Considered Minor.No Press Release Planned
PNO-V-90-035, on 900804,fire Discovered in Noncontaminated Laundry Room in Units 2 & 3 Shared Radwaste Bldg.Caused by Overheated Clothing Dryer.No Radiological Release Resulted from Fire & No safety-related Equipment Affected	6 August 1990	PNO-V-90-035:on 900804,fire Discovered in Noncontaminated Laundry Room in Units 2 & 3 Shared Radwaste Bldg.Caused by Overheated Clothing Dryer.No Radiological Release Resulted from Fire & No safety-related Equipment Affected
PNO-V-90-034, on 900728,unit 2 Was Shutdown to Inspect & Repair SG Feedrings,As Result of Degradation Found During Insp of Unit 3 SG Feedrings & Other Listed Work Was Performed	30 July 1990	PNO-V-90-034:on 900728,unit 2 Was Shutdown to Inspect & Repair SG Feedrings,As Result of Degradation Found During Insp of Unit 3 SG Feedrings & Other Listed Work Was Performed
PNO-V-88-014, on 880219,inadvertent Safety Injection Actuation Occurred While Testing of Actuation Logic Matrix Was in Progress & W/Unit at 100% Power.Unit Stabilized W/O Complication & Safety Injection Components Restored	22 February 1988	PNO-V-88-014:on 880219,inadvertent Safety Injection Actuation Occurred While Testing of Actuation Logic Matrix Was in Progress & W/Unit at 100% Power.Unit Stabilized W/O Complication & Safety Injection Components Restored
PNO-V-88-012, on 880211,moderate Earthquake,Measuring 4.7 on Richter Scale,Hit Whittier,Ca Area.No Seismic Alarms Activated at Plant.No Damage Identified at Site	11 February 1988	PNO-V-88-012:on 880211,moderate Earthquake,Measuring 4.7 on Richter Scale,Hit Whittier,Ca Area.No Seismic Alarms Activated at Plant.No Damage Identified at Site	Earthquake
PNO-V-88-002, on 880116,reactor Shutdown Commenced for More than 48 H Due to Alarms on Main Generator Hydrogen Detraining Unit.Caused by Hydrogen Leak Into Stator Cooling Water Sys in Main Generator.Visual & Sonic Insps Performed	19 January 1988	PNO-V-88-002:on 880116,reactor Shutdown Commenced for More than 48 H Due to Alarms on Main Generator Hydrogen Detraining Unit.Caused by Hydrogen Leak Into Stator Cooling Water Sys in Main Generator.Visual & Sonic Insps Performed
ML20234D183	28 December 1987	PNS-V-87-009A:on 871209,Region V Reported Licensee Investigating Rept of Card Playing in Security Alarm Station.Disiplinary Action:Three Supervisors Terminated & Nine Security Officers Suspended
ML20237A131	9 December 1987	PNS-V-87-009:on 871208,NRC Notified That Nine Security Officers & Two Supervisors Under Investigation for Alleged Card Playing While on Duty in Central Alarm Room.Licensee Believes Activity Caused No Degradation in Security Sys
PNO-V-87-076, on 871123-24,two Moderate Earthquakes Centered Near Westmoreland,Ca Occurred,Triggering Seismic Alarms at San Onofre.Unusal Event Declared.Plant Sys & Components Not Adversely Affected.Effects on Other Locations Noted	24 November 1987	PNO-V-87-076:on 871123-24,two Moderate Earthquakes Centered Near Westmoreland,Ca Occurred,Triggering Seismic Alarms at San Onofre.Unusal Event Declared.Plant Sys & Components Not Adversely Affected.Effects on Other Locations Noted	Earthquake
PNO-V-87-067, on 871007,licensee Reported That Recently Completed Single Failure Analyses Had Identified Potential Single Failures Which Had Not Previously Been Known.Lists Potential Single Failures Associated W/Esfs	8 October 1987	PNO-V-87-067:on 871007,licensee Reported That Recently Completed Single Failure Analyses Had Identified Potential Single Failures Which Had Not Previously Been Known.Lists Potential Single Failures Associated W/Esfs	Unanalyzed Condition
PNO-V-87-065, on 871004,significant Aftershock Experienced from 871001 Earthquake.Aftershock Registered 5.5 on Richter Scale.Seismic Instruments Actuated at 0.014g at Unit 1.No Damage to Equipment Occurred	5 October 1987	PNO-V-87-065:on 871004,significant Aftershock Experienced from 871001 Earthquake.Aftershock Registered 5.5 on Richter Scale.Seismic Instruments Actuated at 0.014g at Unit 1.No Damage to Equipment Occurred	Earthquake
PNO-V-87-063, on 871001,moderate Earthquake Experienced at Plant.Unusual Event Declared.No Damage Identified at Site. Util Headquarters Evacuated to Inspect for Structural Damage	1 October 1987	PNO-V-87-063:on 871001,moderate Earthquake Experienced at Plant.Unusual Event Declared.No Damage Identified at Site. Util Headquarters Evacuated to Inspect for Structural Damage	Earthquake
PNO-V-87-059, on 870831,five People Involved in Operating Cooling Suction Valve 2HV-9378 Found Contaminated by I-131 Due to Unisolable Leak in Valve.Caused by Failure of Valve & Valve Packing.Nature of Failure Under Investigation	1 September 1987	PNO-V-87-059:on 870831,five People Involved in Operating Cooling Suction Valve 2HV-9378 Found Contaminated by I-131 Due to Unisolable Leak in Valve.Caused by Failure of Valve & Valve Packing.Nature of Failure Under Investigation
PNO-V-87-047A, on 870621,interruption in Power to Phase B of non-1E Uninterruptible Power Supply Caused Sharp Reduction in Feedwater Control Valve for Steam Generator 88,causing Reactor Trip.Update Confirms Operation of Safety Functions	24 June 1987	PNO-V-87-047A:on 870621,interruption in Power to Phase B of non-1E Uninterruptible Power Supply Caused Sharp Reduction in Feedwater Control Valve for Steam Generator 88,causing Reactor Trip.Update Confirms Operation of Safety Functions
PNO-V-87-047, on 870621,interruption in Power to Phase B of non-1E Uninterruptable Power Supply Caused Sharp Reduction in Feedwater Flow to Steam Generator 88 & Subsequent Reactor Trip.Caused by Loose Cable Plug Lug.Lugs Inspected	22 June 1987	PNO-V-87-047:on 870621,interruption in Power to Phase B of non-1E Uninterruptable Power Supply Caused Sharp Reduction in Feedwater Flow to Steam Generator 88 & Subsequent Reactor Trip.Caused by Loose Cable Plug Lug.Lugs Inspected
PNO-V-87-021, on 870310,reactor Tripped Due to Turbine Trip from Grounded Exciter.Caused by Maint Personnel Dropping Exciter Brush in Rigging.Licensee Plans Shutdown of Unit for 1 Wk to Perform Maint	11 March 1987	PNO-V-87-021:on 870310,reactor Tripped Due to Turbine Trip from Grounded Exciter.Caused by Maint Personnel Dropping Exciter Brush in Rigging.Licensee Plans Shutdown of Unit for 1 Wk to Perform Maint
PNO-V-87-017, on 870223,licensee Informed Region V That Press Release Made Re 870221 Discovery of Small Particle of Radioactive Matl in Employee Home.Caused by Exposure to Leaking Fuel Pins.Region Will Conduct Special Insp	24 February 1987	PNO-V-87-017:on 870223,licensee Informed Region V That Press Release Made Re 870221 Discovery of Small Particle of Radioactive Matl in Employee Home.Caused by Exposure to Leaking Fuel Pins.Region Will Conduct Special Insp
PNO-V-87-009, on 870202,plant Worker Repeatedly Caused Portal Radiation Monitor to Alarm on Exit from Work Activities in Containment Bldg.Radioactive Matl Found on Inside Sleeve of Shirt.Survey Procedures Improved to Control Exposure	5 February 1987	PNO-V-87-009:on 870202,plant Worker Repeatedly Caused Portal Radiation Monitor to Alarm on Exit from Work Activities in Containment Bldg.Radioactive Matl Found on Inside Sleeve of Shirt.Survey Procedures Improved to Control Exposure
PNO-V-86-092B, on 870112,licensee Submitted Rept Stating That Investigation of Potential Hand Exposure Incomplete. Occurrence of Exposure Not Established.Most Likely Exposure Source Would Involve Direct Contact W/Fuel Specks	13 January 1987	PNO-V-86-092B:on 870112,licensee Submitted Rept Stating That Investigation of Potential Hand Exposure Incomplete. Occurrence of Exposure Not Established.Most Likely Exposure Source Would Involve Direct Contact W/Fuel Specks
PNO-V-86-092A, on 861216,insp Confirmed Licensee Dedicating Resources & Mgt to Resolve Potential Extremity Exposure. Medical Consultant Conferred W/Licensee Re Biological Indicators.Source Could Be Direct Contact W/Fuel Specks	17 December 1986	PNO-V-86-092A:on 861216,insp Confirmed Licensee Dedicating Resources & Mgt to Resolve Potential Extremity Exposure. Medical Consultant Conferred W/Licensee Re Biological Indicators.Source Could Be Direct Contact W/Fuel Specks
PNO-V-86-092, on 861212,reported That Quarterly Exposure Limit for Worker Exceeded.Right Hand Received Dose of 511.99 Rem,Left Hand 160 Mrem & Whole Body 114 Mrem.Worker Involved in Oct 1986 Reactor Coolant Pump Seal Overhaul	12 December 1986	PNO-V-86-092:on 861212,reported That Quarterly Exposure Limit for Worker Exceeded.Right Hand Received Dose of 511.99 Rem,Left Hand 160 Mrem & Whole Body 114 Mrem.Worker Involved in Oct 1986 Reactor Coolant Pump Seal Overhaul
PNO-V-86-091, on 861210 Turbine Tripped Due to Interruption of Power to non-1E Instrument Bus,Causing Reactor Trip. Event Under Investigation.Steam Bypass Control Sys Did Not Operate Because of Deenergized Instrument Bus	11 December 1986	PNO-V-86-091:on 861210 Turbine Tripped Due to Interruption of Power to non-1E Instrument Bus,Causing Reactor Trip. Event Under Investigation.Steam Bypass Control Sys Did Not Operate Because of Deenergized Instrument Bus
ML20215C727	5 December 1986	PNS-V-86-007A:investigation by Corporate Security Personnel of Unauthorized Manipulation of Plant Components Expanded to Approx 62 Individuals.No Indications of Addl Tampering Identified.Region V Inspector Met W/Fbi
ML20214U957	3 December 1986	PNS-V-86-007:on 861129,red & Green Indicating Light Lenses Found Reversed for Various Equipment & on 861202,determined That 10 Circuit Breakers Manipulated.Unauthorized Component Manipulation Under Investigation.Fbi Assistance Requested
PNO-V-86-080, on 861113,unit Shut Down to Correct Lube Oil Leak on Inboard Motor Bearing of West Main Feed Pump. Leakage Was Through Labyrinth Seal Associated W/Bearing. Bearing Seal Disassembled for Evaluation	14 November 1986	PNO-V-86-080:on 861113,unit Shut Down to Correct Lube Oil Leak on Inboard Motor Bearing of West Main Feed Pump. Leakage Was Through Labyrinth Seal Associated W/Bearing. Bearing Seal Disassembled for Evaluation
PNO-V-86-073, GL Mcchain,In Custody by FBI on Parole Violation,Issued Claims of Evading Security Background Checks for 6 Yrs While Working at Listed Facilities & Knows of Falsified Weld Records.Investigation in Progress	23 October 1986	PNO-V-86-073:GL Mcchain,In Custody by FBI on Parole Violation,Issued Claims of Evading Security Background Checks for 6 Yrs While Working at Listed Facilities & Knows of Falsified Weld Records.Investigation in Progress
PNO-V-86-066, on 860929,shutdown Commenced Due to Excessive Leakage from Reactor Coolant Pump Seal.Seals to Be Replaced & Addl Maint Performed	30 September 1986	PNO-V-86-066:on 860929,shutdown Commenced Due to Excessive Leakage from Reactor Coolant Pump Seal.Seals to Be Replaced & Addl Maint Performed
PNO-V-86-052, on 860805,reactor Trip Initiated by Turbine Load Rejection When Control Valves Closed,Causing Insurge of Water Into Pressurizer.Cause Under Investigation	5 August 1986	PNO-V-86-052:on 860805,reactor Trip Initiated by Turbine Load Rejection When Control Valves Closed,Causing Insurge of Water Into Pressurizer.Cause Under Investigation
PNO-V-86-049, on 860729 & 30,pressure Transmitter 459 Failed Low Resulting in Steam Flow/Feed Flow Mismatch Trip Circuits Becoming Inoperable.Caused by Failed Electric Card in Pressure Transmitter Amplifier.Amplifier Replaced	30 July 1986	PNO-V-86-049:on 860729 & 30,pressure Transmitter 459 Failed Low Resulting in Steam Flow/Feed Flow Mismatch Trip Circuits Becoming Inoperable.Caused by Failed Electric Card in Pressure Transmitter Amplifier.Amplifier Replaced
PNO-V-86-045, on 860717,reactor Trip Occurred from 3% Power. Caused by Momentary Drop in Voltage Through break-before- Make Switch.Momentary Drop Allowed Permissive P7 to Unblock & Trip Signal Went to Reactor Protection Sys	17 July 1986	PNO-V-86-045:on 860717,reactor Trip Occurred from 3% Power. Caused by Momentary Drop in Voltage Through break-before- Make Switch.Momentary Drop Allowed Permissive P7 to Unblock & Trip Signal Went to Reactor Protection Sys