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| Issue date | Title | Topic | |
|---|---|---|---|
| PNO-III-98-013, on 980126,turbine Tripped Causing Subsequent Reactor Trip.Cause of Turbine Trip Remains Under Investigation.Appears Replacement Circuit Board Had Incorrect Electronic Configuration | 29 January 1998 | PNO-III-98-013:on 980126,turbine Tripped Causing Subsequent Reactor Trip.Cause of Turbine Trip Remains Under Investigation.Appears Replacement Circuit Board Had Incorrect Electronic Configuration | |
| PNO-III-97-071, on 970903,Comm Ed Announced Series of Mgt Changes & Restructuring of Nuclear Div Organization.New Site Vice Presidents at Braidwood & Quad Cities Former Plant Managers.State of Il Will Be Notified of Mgt Changes | 3 September 1997 | PNO-III-97-071:on 970903,Comm Ed Announced Series of Mgt Changes & Restructuring of Nuclear Div Organization.New Site Vice Presidents at Braidwood & Quad Cities Former Plant Managers.State of Il Will Be Notified of Mgt Changes | |
| PNO-III-94-086, on 941103,near End of Operability Test for 2B Emergency Diesel Generator Master Rod in Diesel Failed Resulting in Significant Internal Damage to 1L & 1R Cylinders | 7 November 1994 | PNO-III-94-086:on 941103,near End of Operability Test for 2B Emergency Diesel Generator Master Rod in Diesel Failed Resulting in Significant Internal Damage to 1L & 1R Cylinders | |
| PNO-III-94-013, on 940308,contract Worker Was Injured When He Fell Into Blowdown Demineralizer Vault.Worker Was Transported in Ambulance to Area Hosp in Serious Condition | 9 March 1994 | PNO-III-94-013:on 940308,contract Worker Was Injured When He Fell Into Blowdown Demineralizer Vault.Worker Was Transported in Ambulance to Area Hosp in Serious Condition | |
| PNO-III-93-061, on 931023,licensee Commenced Shutdown of Unit 1 Due to Indications of Primary to Secondary Leak in SG 1C. Shutdown Completed on 931025.State of Il Notified | 25 October 1993 | PNO-III-93-061:on 931023,licensee Commenced Shutdown of Unit 1 Due to Indications of Primary to Secondary Leak in SG 1C. Shutdown Completed on 931025.State of Il Notified | |
| PNO-III-93-057, on 931003,reactor Tripped Due to Low Steam Generator Level.Feedwater Regulating Valve for D Steam Generator Had Failed in Fully Closed Position Due to Failed Positioner.State of Il Notified | 4 October 1993 | PNO-III-93-057:on 931003,reactor Tripped Due to Low Steam Generator Level.Feedwater Regulating Valve for D Steam Generator Had Failed in Fully Closed Position Due to Failed Positioner.State of Il Notified | |
| PNO-III-92-056, on 921015,licensee Reported Discovery of Evidence of Vandalism in Upper Cable Spreading Room,Shared by Both Units,Caused by Contractor Employee Who Performed Firewatch Duties.Employee Site Access Suspended | 16 October 1992 | PNO-III-92-056:on 921015,licensee Reported Discovery of Evidence of Vandalism in Upper Cable Spreading Room,Shared by Both Units,Caused by Contractor Employee Who Performed Firewatch Duties.Employee Site Access Suspended | |
| PNO-III-90-055, on 900801,unit Shut Down to Repair Check Valve 1A Essential Svc Water Pump.Caused by Failure of Pump Discharge Check Valve to Seat.Check Valve Will Be Replaced | 8 August 1990 | PNO-III-90-055:on 900801,unit Shut Down to Repair Check Valve 1A Essential Svc Water Pump.Caused by Failure of Pump Discharge Check Valve to Seat.Check Valve Will Be Replaced | |
| PNO-III-89-047, on 890718,rod Control Sys Lost Power,Dropping Control Rods Into Reactors.Caused by Lightning Strikes.Power Supplies Reset & Rod Control Sys Operating Normally.Licensee Plans to Restart Both Units on 890719 | 19 July 1989 | PNO-III-89-047:on 890718,rod Control Sys Lost Power,Dropping Control Rods Into Reactors.Caused by Lightning Strikes.Power Supplies Reset & Rod Control Sys Operating Normally.Licensee Plans to Restart Both Units on 890719 | |
| PNO-III-89-029A, on 890425,Augmented Insp Team Began Insp at Plant in Response to NRC Observations of Two Employees Appearing Inattentive to Duty.Licensee Reestablished Shift Overview Superintendent Position to Provide Mgt Visibility | 28 April 1989 | PNO-III-89-029A:on 890425,Augmented Insp Team Began Insp at Plant in Response to NRC Observations of Two Employees Appearing Inattentive to Duty.Licensee Reestablished Shift Overview Superintendent Position to Provide Mgt Visibility | |
| PNO-III-89-031, on 890423,licensee Shutdown Reactor Because Instrument Power Supply Was Found to Be Inoperable on 970422.Caused by Faulty Capacitor & Inverter Repaired & Returned to Svc on 890425 | 25 April 1989 | PNO-III-89-031:on 890423,licensee Shutdown Reactor Because Instrument Power Supply Was Found to Be Inoperable on 970422.Caused by Faulty Capacitor & Inverter Repaired & Returned to Svc on 890425 | |
| PNO-III-89-029, on 890418,Region III Operator Licensing Examiner Observed Individual with Eyes Closed in Chair in Unit 1 Cr.On 890419,licensing Examiner Observed Radiation Control Technician Asleep at Desk by RCA at Building Exit | 24 April 1989 | PNO-III-89-029:on 890418,Region III Operator Licensing Examiner Observed Individual with Eyes Closed in Chair in Unit 1 Cr.On 890419,licensing Examiner Observed Radiation Control Technician Asleep at Desk by RCA at Building Exit | Inattentive |
| PNO-III-89-025, on 890411,main Turbine Tripped by Licensee. Reactor Shut Down for Repairs on Already Malfunctioning Main Turbine Governor Valve.Unit Expected to Return to Svc on 890416.State of Il to Be Notified | 11 April 1989 | PNO-III-89-025:on 890411,main Turbine Tripped by Licensee. Reactor Shut Down for Repairs on Already Malfunctioning Main Turbine Governor Valve.Unit Expected to Return to Svc on 890416.State of Il to Be Notified | |
| PNO-III-88-094, on 881115,discovered Joint in 4-inch Instrument Air Line Damaged & Causing Loss of Pressure in Compressed Air Sys.Air Line Joint Probably Stepped on by Painter Working in Area | 16 November 1988 | PNO-III-88-094:on 881115,discovered Joint in 4-inch Instrument Air Line Damaged & Causing Loss of Pressure in Compressed Air Sys.Air Line Joint Probably Stepped on by Painter Working in Area | |
| PNO-III-88-088, on 881025,unit Manually Tripped from 28% Power to Avoid Challenging Reactor Protection Sys.Caused by Low Steam Generator Water Levels.Unit Expected to Be Down from Five to Seven Days While Strainers Cleaned | 26 October 1988 | PNO-III-88-088:on 881025,unit Manually Tripped from 28% Power to Avoid Challenging Reactor Protection Sys.Caused by Low Steam Generator Water Levels.Unit Expected to Be Down from Five to Seven Days While Strainers Cleaned | |
| PNO-III-88-086, on 881016,reactor Automatically Shut Down Following Loss of Offsite power.Diesel-driven Auxiliary Feedwater Pumps Maintained Steam Generator Level.Caused by Explosion & Fire in Substation & Carboard in Delay Relay | 18 October 1988 | PNO-III-88-086:on 881016,reactor Automatically Shut Down Following Loss of Offsite power.Diesel-driven Auxiliary Feedwater Pumps Maintained Steam Generator Level.Caused by Explosion & Fire in Substation & Carboard in Delay Relay | |
| PNO-III-88-048, on 880520,full Power OL Issued.Currently at 8% Power,Licensee Engaged in Power Ascension Activities. NRR Region IV Will Provide Augmented Insp Coverage of Power Ascension | 23 May 1988 | PNO-III-88-048:on 880520,full Power OL Issued.Currently at 8% Power,Licensee Engaged in Power Ascension Activities. NRR Region IV Will Provide Augmented Insp Coverage of Power Ascension | |
| PNO-III-88-026, on 880323,licensee Began Orderly Shutdown of Unit 1 Due to Identified Deficiencies in Lubricant Used in motor-operated Limitorque Valves.Deficiencies Apply to 263 safety-related Valves in Both Units 1 & 2 | 24 March 1988 | PNO-III-88-026:on 880323,licensee Began Orderly Shutdown of Unit 1 Due to Identified Deficiencies in Lubricant Used in motor-operated Limitorque Valves.Deficiencies Apply to 263 safety-related Valves in Both Units 1 & 2 | |
| PNO-III-88-017, on 880308,unit Achieved Initial Criticality. Conditions at Criticality as Expected.Nrc Inspectors Monitored Preparation for Criticality.Ol Permitting Fuel Loading & Low Power Testing Issued on 871218 | 8 March 1988 | PNO-III-88-017:on 880308,unit Achieved Initial Criticality. Conditions at Criticality as Expected.Nrc Inspectors Monitored Preparation for Criticality.Ol Permitting Fuel Loading & Low Power Testing Issued on 871218 | |
| PNO-III-87-154, on 871218,OL Issued to Facility to Permit Fuel Loading & Operation Up to 5% Power.Fuel Loading Scheduled for 871221.Initial Criticality Planned for Feb 1988 | 21 December 1987 | PNO-III-87-154:on 871218,OL Issued to Facility to Permit Fuel Loading & Operation Up to 5% Power.Fuel Loading Scheduled for 871221.Initial Criticality Planned for Feb 1988 | |
| PNO-III-87-155, on 871220,fire Damaged Const Warehouse Outside Protected Area.Cause Under Investigation.Fire Did Not Affect Plant Operations.Local Fire Depts Summoned | 21 December 1987 | PNO-III-87-155:on 871220,fire Damaged Const Warehouse Outside Protected Area.Cause Under Investigation.Fire Did Not Affect Plant Operations.Local Fire Depts Summoned | |
| PNO-III-87-099, on 870717,licensee Declared Diesel Generator 1B Inoperable Following Monthly Surveillance Test.Licensee Unable to Maintain Min Load of 5,500 Kw Per Tech Specs Due to Output Swings.Unit Shut Down in Excess of 48 H | 21 July 1987 | PNO-III-87-099:on 870717,licensee Declared Diesel Generator 1B Inoperable Following Monthly Surveillance Test.Licensee Unable to Maintain Min Load of 5,500 Kw Per Tech Specs Due to Output Swings.Unit Shut Down in Excess of 48 H | |
| PNO-III-87-092, on 870702,util Issued full-power Operating License for Unit 1.State of Il to Be Notified.Unit 2 Under Const & 97% Complete | 2 July 1987 | PNO-III-87-092:on 870702,util Issued full-power Operating License for Unit 1.State of Il to Be Notified.Unit 2 Under Const & 97% Complete | |
| PNO-III-87-081, on 870610,earthquake Measuring 5.0 on Richter Scale Occurred Near Lawrenceville,Il.Unusual Events Declared by Six Power Stations But No Damage Observed.Ground Motion Felt at Five Other Plants | 11 June 1987 | PNO-III-87-081:on 870610,earthquake Measuring 5.0 on Richter Scale Occurred Near Lawrenceville,Il.Unusual Events Declared by Six Power Stations But No Damage Observed.Ground Motion Felt at Five Other Plants | Earthquake |
| PNO-III-87-080, on 870529,reactor Achieved Initial Criticality.Ol Issued on 861017,authorizing Fuel Load & Subcritical Testing.Preparation for & Achievement of Initial Criticality Monitored by Resident Inspectors | 1 June 1987 | PNO-III-87-080:on 870529,reactor Achieved Initial Criticality.Ol Issued on 861017,authorizing Fuel Load & Subcritical Testing.Preparation for & Achievement of Initial Criticality Monitored by Resident Inspectors | |
| PNO-III-87-049, on 870408,handgun Found on Contract Employee During Walk Through Metal Detector at Entrance to Protected Area.Incident Under Investigation.Individual Has Access to All Vital Areas in Plant Except for Central Alarm Station | 8 April 1987 | PNO-III-87-049:on 870408,handgun Found on Contract Employee During Walk Through Metal Detector at Entrance to Protected Area.Incident Under Investigation.Individual Has Access to All Vital Areas in Plant Except for Central Alarm Station | |
| PNO-III-87-047, on 870329,failure of Rocker Arm on Emergency Diesel Generator 2B Number 5 Right Cylinder Occurred. Concurrent Metallurgical Analyses Being Conducted to Determine Cause of Event | 2 April 1987 | PNO-III-87-047:on 870329,failure of Rocker Arm on Emergency Diesel Generator 2B Number 5 Right Cylinder Occurred. Concurrent Metallurgical Analyses Being Conducted to Determine Cause of Event | |
| PNO-III-87-020, on 870204,lubricating Oil & Fuel Leaks Detected During 24 H Test Run of Emergency Diesel Generator. Caused by Interference Between Cross Head & Cross Head Guide.Steps to Ensure Correct Clearance Being Taken | 6 February 1987 | PNO-III-87-020:on 870204,lubricating Oil & Fuel Leaks Detected During 24 H Test Run of Emergency Diesel Generator. Caused by Interference Between Cross Head & Cross Head Guide.Steps to Ensure Correct Clearance Being Taken | |
| PNO-III-87-010, on 870121,both Component Cooling Water Pumps Tripped in Succession Rendering Sys Inoperable.Initial Cause Due to Low Surge Tank Flow.Cause of Low Flow Under Investigation.Operability Restored by Restoring Flow Level, | 22 January 1987 | PNO-III-87-010:on 870121,both Component Cooling Water Pumps Tripped in Succession Rendering Sys Inoperable.Initial Cause Due to Low Surge Tank Flow.Cause of Low Flow Under Investigation.Operability Restored by Restoring Flow Level, | |
| PNO-III-86-126, on 861101,anonymous Male Caller Telephoned Plant Security Ofc Claiming Bomb Had Been Planted in Auxiliary Bldg.Auxiliary Bldg Evacuated Except for Firewatch & Security Personnel & Search Conducted.No Bomb Found | 3 November 1986 | PNO-III-86-126:on 861101,anonymous Male Caller Telephoned Plant Security Ofc Claiming Bomb Had Been Planted in Auxiliary Bldg.Auxiliary Bldg Evacuated Except for Firewatch & Security Personnel & Search Conducted.No Bomb Found | |
| PNO-III-86-117, on 861017,operating License Issued to Commonwealth Edison Co for Braidwood Nuclear Power Station, Unit 1.License Limited to Fuel Loading & Initial Testing Activities Leading to Criticality | 17 October 1986 | PNO-III-86-117:on 861017,operating License Issued to Commonwealth Edison Co for Braidwood Nuclear Power Station, Unit 1.License Limited to Fuel Loading & Initial Testing Activities Leading to Criticality | |
| PNO-III-86-101, on 860918,ASLB Issued Memorandum & Order Authorizing NRR to Issue Limited License to Util for Fuel Loading & Precriticality Testing.Fuel Loading Expected on 861015 | 19 September 1986 | PNO-III-86-101:on 860918,ASLB Issued Memorandum & Order Authorizing NRR to Issue Limited License to Util for Fuel Loading & Precriticality Testing.Fuel Loading Expected on 861015 | |
| PNO-III-86-053, on 860604,pressurizer Relief Tank Overpressurized W/Pure Water Bursting Rupture Diaphragm. Caused by Incorrect Valve Lineup During Testing Leak Detection Sys.Contractor Employees Injured | 5 June 1986 | PNO-III-86-053:on 860604,pressurizer Relief Tank Overpressurized W/Pure Water Bursting Rupture Diaphragm. Caused by Incorrect Valve Lineup During Testing Leak Detection Sys.Contractor Employees Injured | |
| PNO-III-86-030, on 860325,while Conducting Hft,Two Main Steam Line Pipe Supports in Steam Tunnel Failed as Result of Apparent Water Hammer.State of Il Notified | 26 March 1986 | PNO-III-86-030:on 860325,while Conducting Hft,Two Main Steam Line Pipe Supports in Steam Tunnel Failed as Result of Apparent Water Hammer.State of Il Notified | |
| PNO-III-80-040, station Will Start Limited Const of safety- Related Activities During Wk of 800303-08.Staff Will Slowly Be Increased to High of 700 in June | 29 February 1980 | PNO-III-80-040:station Will Start Limited Const of safety- Related Activities During Wk of 800303-08.Staff Will Slowly Be Increased to High of 700 in June | |
| ML20249A885 | 27 December 1977 | PNS-77-050:on 771223,telephone Call Was Received by Secretary for Piping Contractor for Braidwood Site Re Bomb Threat.No Mass Evacuation Was Made & No Suspicious Devices Were Found During Search | |
| ML20236E912 | 16 August 1977 | PNS-77-031:on 770815,anonymous Call Was Received by Supervisor,Stating That Three Sticks of Dynamite Had Been Placed in Unit 1 Containment.Immediate Search Was Conducted & No Explosives Were Found.Site Was Not Evacuated | |
| ML20151U993 | 12 May 1977 | PNO-77-081:on 770511,ironworkers from Kankakee,Il Went on Strike.Ironworkers Contract Expires 770420 & Strike Concerns Wages & Work Rules.No Press Release Made | |
| ML20249B638 | 25 May 1976 | PNO-76-091:on 760525,primary Coolant Target Rock Relief Valve Failed to Close Properly.Preliminary Info Indicates No safety-related Problems Resulted from Event.Inspector at Site to Review Corrective Action & Cause of Failure |