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| Issue date | Title | Topic | |
|---|---|---|---|
| PNO-III-98-030, on 980517,armed Security Guard on Patrol in Owner Controlled Area Reported to Security Person Lying Near Road.Guard Subsequently Reported Being Shot.No Intruder Found.Guard Admitted Shooting Himself in Foot | 18 May 1998 | PNO-III-98-030:on 980517,armed Security Guard on Patrol in Owner Controlled Area Reported to Security Person Lying Near Road.Guard Subsequently Reported Being Shot.No Intruder Found.Guard Admitted Shooting Himself in Foot | |
| PNO-III-98-006, on 980115,licensee Announced Permanent Shut Down of Station.Util Plans to Maintain Plant in Safstor Decommissioning Mode Until Approx 2014 | 15 January 1998 | PNO-III-98-006:on 980115,licensee Announced Permanent Shut Down of Station.Util Plans to Maintain Plant in Safstor Decommissioning Mode Until Approx 2014 | |
| 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-97-035, on 970417,licensee Informed Zion Station of Results of Operations Assessment of Licensed & non-licensed Operating Staff.Licensee Assessed 187 Employees,Both in Mgt & Bargaining Unit Positions.States of Il & Wi Informed | 18 April 1997 | PNO-III-97-035:on 970417,licensee Informed Zion Station of Results of Operations Assessment of Licensed & non-licensed Operating Staff.Licensee Assessed 187 Employees,Both in Mgt & Bargaining Unit Positions.States of Il & Wi Informed | |
| PNO-III-97-034, on 970417,decision Not to Replace SGs Made. as Result of Decision,Comm Ed Stated Zion Station Would Be Shut Down Before Expiration of Operating Licenses in 2013. Util Most Probably Support Operation to 2005 | 18 April 1997 | PNO-III-97-034:on 970417,decision Not to Replace SGs Made. as Result of Decision,Comm Ed Stated Zion Station Would Be Shut Down Before Expiration of Operating Licenses in 2013. Util Most Probably Support Operation to 2005 | |
| PNO-III-97-024, on 970311,Unit 1 Sys Auxiliary Transformer Tripped as Result of Actuation of Sudden Pressure Relay, Indicating Possible Fault in Transformer.Nrc Providing round-the-clock Insp Coverage at Zion | 14 March 1997 | PNO-III-97-024:on 970311,Unit 1 Sys Auxiliary Transformer Tripped as Result of Actuation of Sudden Pressure Relay, Indicating Possible Fault in Transformer.Nrc Providing round-the-clock Insp Coverage at Zion | |
| PNO-III-97-010B, on 970221,plant Containment Spray Pump Found to Be Inoperable During Routine Testing.On 970307,AIT Held Exit Meeting W/Licensee.Ait Concluded That Significant Deficiencies in Oversight of Control Room Found | 7 March 1997 | PNO-III-97-010B:on 970221,plant Containment Spray Pump Found to Be Inoperable During Routine Testing.On 970307,AIT Held Exit Meeting W/Licensee.Ait Concluded That Significant Deficiencies in Oversight of Control Room Found | |
| PNO-III-97-010A, on 970221,AIT Dispatched to Zion Station to Review Improper Control Rod Movement Occurred,During Reactor Shutdown.Licensee Also Formed Event Investigation Team Led by J Brons,Comm Ed Vice-President Nuclear Support | 26 February 1997 | PNO-III-97-010A:on 970221,AIT Dispatched to Zion Station to Review Improper Control Rod Movement Occurred,During Reactor Shutdown.Licensee Also Formed Event Investigation Team Led by J Brons,Comm Ed Vice-President Nuclear Support | |
| PNO-III-97-010, on 970219,diesel-driven CS Pump Found to Be Inoperable During Routine Surveillance Test.Reactor Operator Realized,Rods Were Moved Further than Expected.Actual Safety Significance of Error Minimal | 24 February 1997 | PNO-III-97-010:on 970219,diesel-driven CS Pump Found to Be Inoperable During Routine Surveillance Test.Reactor Operator Realized,Rods Were Moved Further than Expected.Actual Safety Significance of Error Minimal | |
| PNO-III-97-003, on 970117,outage Extended to Address Technical & Plant Condition Issues.Actions to Be Completed During Outage Extension Include Submitted Info | 17 January 1997 | PNO-III-97-003:on 970117,outage Extended to Address Technical & Plant Condition Issues.Actions to Be Completed During Outage Extension Include Submitted Info | |
| PNO-III-92-048, on 920917,licensee Shut Down Unit 1 Because 1A turbine-driven AF Pump Declared Inoperable & Operability of One of Two 1A SG Injection Lines Considered Questionable. Equipment Debris Found in AF System.Repairs Require 1 Week | 18 September 1992 | PNO-III-92-048:on 920917,licensee Shut Down Unit 1 Because 1A turbine-driven AF Pump Declared Inoperable & Operability of One of Two 1A SG Injection Lines Considered Questionable. Equipment Debris Found in AF System.Repairs Require 1 Week | |
| PNO-III-90-061, on 900922,one of Two Main Transformers Exploded,Causing Reactor Trip from 40% Power After Turbine Trip Occurred.Cause Under Investigation.Replacement Transformer Will Be Installed in 3 Wks | 24 September 1990 | PNO-III-90-061:on 900922,one of Two Main Transformers Exploded,Causing Reactor Trip from 40% Power After Turbine Trip Occurred.Cause Under Investigation.Replacement Transformer Will Be Installed in 3 Wks | |
| PNO-III-90-053, on 900724,55-year Old Employee of fire-watch Contractor Died of Apparent Heart Attack,While on Duty in Turbine Building | 24 July 1990 | PNO-III-90-053:on 900724,55-year Old Employee of fire-watch Contractor Died of Apparent Heart Attack,While on Duty in Turbine Building | Fatality |
| ML20212A259 | 6 March 1990 | PNO-III-90-14A:on 900306,high Bearing Temperature Resulted in Common EDG for Two Units to Be Declared Inoperable on 900305 | |
| PNO-III-89-055, on 890817,security Guard Arrested for Robbery.Guard Site Access Badge Terminated on 890817 After Plant Police Notified Licensee of Planned Interview of Suspect Re Robberies | 18 August 1989 | PNO-III-89-055:on 890817,security Guard Arrested for Robbery.Guard Site Access Badge Terminated on 890817 After Plant Police Notified Licensee of Planned Interview of Suspect Re Robberies | |
| PNO-III-89-040, on 890624,power Lost to All Control Room Annunciators for Reactor & safety-related Sys.Caused by Troubleshooting Ground on Electrical Bus for balance-of-plant Annunciators & Blow Fuses | 26 June 1989 | PNO-III-89-040:on 890624,power Lost to All Control Room Annunciators for Reactor & safety-related Sys.Caused by Troubleshooting Ground on Electrical Bus for balance-of-plant Annunciators & Blow Fuses | |
| PNO-III-89-033A, on 890508 & 09,gaseous Release Occurred from Coolant Vol Control Sys Mixed Bed Demineralizer 1A Through Floor Drains to Auxiliary Bldg Vent Stack.Region III Monitoring Licensee Investigation | 11 May 1989 | PNO-III-89-033A:on 890508 & 09,gaseous Release Occurred from Coolant Vol Control Sys Mixed Bed Demineralizer 1A Through Floor Drains to Auxiliary Bldg Vent Stack.Region III Monitoring Licensee Investigation | |
| PNO-III-89-033, on 890308,high Radiation Alarm Received When Vent & Drain Valves of Coolant Vol Control Sys 1A Mixed Bed Demineralizer Opened.Caused by Use of Erroneous Stack Flow Rate.New Calculations Determined Release Rate within Limits | 8 March 1989 | PNO-III-89-033:on 890308,high Radiation Alarm Received When Vent & Drain Valves of Coolant Vol Control Sys 1A Mixed Bed Demineralizer Opened.Caused by Use of Erroneous Stack Flow Rate.New Calculations Determined Release Rate within Limits | |
| PNO-III-88-087, on 881025,licensee Determined That Neither of Two motor-driven Auxiliary Feedwater Pumps Would Automatically Start W/Loss of Offsite Power & lo-lo Steam Generator Level.Pumps Declared Inoperable | 26 October 1988 | PNO-III-88-087:on 881025,licensee Determined That Neither of Two motor-driven Auxiliary Feedwater Pumps Would Automatically Start W/Loss of Offsite Power & lo-lo Steam Generator Level.Pumps Declared Inoperable | |
| PNO-III-88-067, on 880722,controlled Shutdown Initiated to Repair Steam Leak.Unit Down for More than 48 H for Steam Leak Repair & Portions of Piping Which Exhibited Wall Thickness of Less than Three Inches.State of Il Notified | 25 July 1988 | PNO-III-88-067:on 880722,controlled Shutdown Initiated to Repair Steam Leak.Unit Down for More than 48 H for Steam Leak Repair & Portions of Piping Which Exhibited Wall Thickness of Less than Three Inches.State of Il Notified | |
| PNO-III-87-129, on 871002,facility Shut Down to Repair Packing Leaks on Both Pressurizer Spray Valves.Cause of Packing Leaks Not Stated.Valve Repairs Now Completed & Repair of Position Indicator on One Valve Underway | 5 October 1987 | PNO-III-87-129:on 871002,facility Shut Down to Repair Packing Leaks on Both Pressurizer Spray Valves.Cause of Packing Leaks Not Stated.Valve Repairs Now Completed & Repair of Position Indicator on One Valve Underway | Packing leak |
| 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-87-073, on 870521,personnel Discovered Water Leaking Through Doors on Diesel Fuel Oil Storage Tank Rooms Into Turbine Bldg.Caused by Removal of Wrong Check Valve Bonnet. Water Pumped to Waste Water Treatment Sys for Processing | 22 May 1987 | PNO-III-87-073:on 870521,personnel Discovered Water Leaking Through Doors on Diesel Fuel Oil Storage Tank Rooms Into Turbine Bldg.Caused by Removal of Wrong Check Valve Bonnet. Water Pumped to Waste Water Treatment Sys for Processing | |
| PNO-III-87-061, on 870425,generator Shutdown to Reduce Frame Vibrations & Repair Hydrogen Leak Into Stator Water Cooling Sys.Inspectors Monitoring Licensee Activities.Reactor Will Be Kept Critical to Support Generator Balance Runs | 28 April 1987 | PNO-III-87-061:on 870425,generator Shutdown to Reduce Frame Vibrations & Repair Hydrogen Leak Into Stator Water Cooling Sys.Inspectors Monitoring Licensee Activities.Reactor Will Be Kept Critical to Support Generator Balance Runs | |
| PNO-III-87-043, on 870327,fire Discovered in Turbine Bldg in Cardboard Box Containing Noncombustible Piping Insulation. Fire Extinguished by Fire Brigade.Fire Probably Caused by Discarded Cigarette | 27 March 1987 | PNO-III-87-043:on 870327,fire Discovered in Turbine Bldg in Cardboard Box Containing Noncombustible Piping Insulation. Fire Extinguished by Fire Brigade.Fire Probably Caused by Discarded Cigarette | |
| PNO-III-87-018, on 870130,telegram Addressed to HR Denton Received Carrying Final Warning That Zion Nuclear Plant Shall Be Closed, Unless Info Made Available.Responsible Individual Located by FBI & Agreed to Psychiatric Treatment | 2 February 1987 | PNO-III-87-018:on 870130,telegram Addressed to HR Denton Received Carrying Final Warning That Zion Nuclear Plant Shall Be Closed, Unless Info Made Available.Responsible Individual Located by FBI & Agreed to Psychiatric Treatment | |
| PNO-III-86-121, on 861110,preliminary Evaluation by Licensee & Region III Determined Diesel Generator 1B Failure Caused by Improperly Torqued Bolt in Articulated Connecting Rod. Licensee Plans to Examine Remaining Generators | 10 November 1986 | PNO-III-86-121:on 861110,preliminary Evaluation by Licensee & Region III Determined Diesel Generator 1B Failure Caused by Improperly Torqued Bolt in Articulated Connecting Rod. Licensee Plans to Examine Remaining Generators | |
| PNO-III-86-110, documents State of Il Concerns Re Viability of Emergency Evacuation Routes for Plant Due to Recent Flooding in Area.Plants Not Affected as Unit 1 Shut Down for Refueling & Unit 2 Operating at 99% Power | 30 September 1986 | PNO-III-86-110:documents State of Il Concerns Re Viability of Emergency Evacuation Routes for Plant Due to Recent Flooding in Area.Plants Not Affected as Unit 1 Shut Down for Refueling & Unit 2 Operating at 99% Power | |
| PNO-III-86-098, on 860911,small Unplanned Release of Radioactive Noble Gas Detected in Auxiliary Bldg & Control Room.Caused by Malfunctioning Level Indicator on Spent Resin Storage Tank.Gas Cleared by Ventilation Sys | 15 September 1986 | PNO-III-86-098:on 860911,small Unplanned Release of Radioactive Noble Gas Detected in Auxiliary Bldg & Control Room.Caused by Malfunctioning Level Indicator on Spent Resin Storage Tank.Gas Cleared by Ventilation Sys | |
| PNO-III-86-064, on 860705,svc Water Pump 1B Failed.Apparently Due to Failure of Pump Shaft,Lower Bearing or Lower Impeller.Unit Placed in Hot Shutdown.Approx 7 Days Needed to Repair Pump | 7 July 1986 | PNO-III-86-064:on 860705,svc Water Pump 1B Failed.Apparently Due to Failure of Pump Shaft,Lower Bearing or Lower Impeller.Unit Placed in Hot Shutdown.Approx 7 Days Needed to Repair Pump | |
| PNO-III-86-062, on 860627,while Operating at 68% Power, Lightening Strike Caused Unit to Automatically Trip.Shutdown Was Due to Failure of Some Primary Sys Instruments,Causing Reactor Protection Sys to Trip Unit.State of Il Notified | 30 June 1986 | PNO-III-86-062:on 860627,while Operating at 68% Power, Lightening Strike Caused Unit to Automatically Trip.Shutdown Was Due to Failure of Some Primary Sys Instruments,Causing Reactor Protection Sys to Trip Unit.State of Il Notified | |
| PNO-III-86-046, on 860516,RCS Found Leaking Approximately 20 Gpm.Caused by Failed Packing in Pressurizer Spray Valve. Valve Packing & leak-related Damage to Drain Line Sight Glass & Rupture Disk Will Be Repaired | 16 May 1986 | PNO-III-86-046:on 860516,RCS Found Leaking Approximately 20 Gpm.Caused by Failed Packing in Pressurizer Spray Valve. Valve Packing & leak-related Damage to Drain Line Sight Glass & Rupture Disk Will Be Repaired | |
| PNO-I-86-038, on 860515,current Contract W/Local Unions Will Expire & Strike of Operators,Maint Personnel & Clerical Staff May Occur.Unions Recommend Rejection of Util Proposal. Plant Shut Down Since 860412 Containment Isolation Occurred | 15 May 1986 | PNO-I-86-038:on 860515,current Contract W/Local Unions Will Expire & Strike of Operators,Maint Personnel & Clerical Staff May Occur.Unions Recommend Rejection of Util Proposal. Plant Shut Down Since 860412 Containment Isolation Occurred | |
| PNO-III-86-041, on 860509,unit Shut Down to Repair Failed Main Steam Line Check Valve on Loop B.Normal Differential Pressure Exceeded by 37 Psig.Unit Expected to Be Shut Down for 48 H | 9 May 1986 | PNO-III-86-041:on 860509,unit Shut Down to Repair Failed Main Steam Line Check Valve on Loop B.Normal Differential Pressure Exceeded by 37 Psig.Unit Expected to Be Shut Down for 48 H | |
| PNO-III-86-020, on 860303,Westinghouse DB-50 Reactor Trip Breaker Tripped at 190 Milliseconds During Testing. Subsequent Response Tests Satisfactory.Vendor Assisting in Troubleshooting | 10 March 1986 | PNO-III-86-020:on 860303,Westinghouse DB-50 Reactor Trip Breaker Tripped at 190 Milliseconds During Testing. Subsequent Response Tests Satisfactory.Vendor Assisting in Troubleshooting | |
| PNO-III-86-013, on 860219,both Unit 2 Diesel Generators & Units 1 & 2 Shared Diesel Declared Inoperable.Cause Undetermined.Partially Closed Fuel Line Valve on Diesel Generator 2A Discovered.Generators Retested | 20 February 1986 | PNO-III-86-013:on 860219,both Unit 2 Diesel Generators & Units 1 & 2 Shared Diesel Declared Inoperable.Cause Undetermined.Partially Closed Fuel Line Valve on Diesel Generator 2A Discovered.Generators Retested | |
| PNO-III-85-102, on 851214,during Outage,Both Trains of RHR Sys Lost When Water in Reactor Vessel Drained Below Level of Suction Line.Caused by Erroneous Control Room Indication of RCS Configuration Used for Outage | 16 December 1985 | PNO-III-85-102:on 851214,during Outage,Both Trains of RHR Sys Lost When Water in Reactor Vessel Drained Below Level of Suction Line.Caused by Erroneous Control Room Indication of RCS Configuration Used for Outage | Reactor Vessel Water Level |
| PNO-III-85-087, on 851007,concrete Finisher Killed After Falling 45 Ft While Working on Interim Radwaste Storage Facility.No Contamination Involved | 8 October 1985 | PNO-III-85-087:on 851007,concrete Finisher Killed After Falling 45 Ft While Working on Interim Radwaste Storage Facility.No Contamination Involved | Fatality |
| PNO-III-83-065, on 830727,licensee Determined That All 3 EDGs Associated W/Unit 2 Were Technically Inoperable Since Required Surveillance Testing Had Not Been Conducted within Proper Time Frame.State of Il Notified | 28 July 1983 | PNO-III-83-065:on 830727,licensee Determined That All 3 EDGs Associated W/Unit 2 Were Technically Inoperable Since Required Surveillance Testing Had Not Been Conducted within Proper Time Frame.State of Il Notified | |
| PNO-III-82-062, on 820629,three-nonlicensed Stationmen at Quad-Cities Station Identified by Alleger as Users of Marijuana.On Same Day,During Search of Incoming Truck, Security Personnel Discovered Marijuana Cigarette | 30 June 1982 | PNO-III-82-062:on 820629,three-nonlicensed Stationmen at Quad-Cities Station Identified by Alleger as Users of Marijuana.On Same Day,During Search of Incoming Truck, Security Personnel Discovered Marijuana Cigarette | |
| PNO-III-80-166, on 800903,unit Tripped from 93% Power Due to Low Steam Generator Level,Caused by Feedwater Pump Trip. Water Hammer Occurred While Steam Generator Level Was Below Feed Ring Causing Safety Injection Actuation | 3 September 1980 | PNO-III-80-166:on 800903,unit Tripped from 93% Power Due to Low Steam Generator Level,Caused by Feedwater Pump Trip. Water Hammer Occurred While Steam Generator Level Was Below Feed Ring Causing Safety Injection Actuation | |
| PNO-III-80-063A, 800402,ltr from Mayor of Waukegan,Il, Demanded Actions as Result of 800331 Unplanned Gaseous Release.Region 3 Is Continuing Investigation & Evaluation | 3 April 1980 | PNO-III-80-063A:800402,ltr from Mayor of Waukegan,Il, Demanded Actions as Result of 800331 Unplanned Gaseous Release.Region 3 Is Continuing Investigation & Evaluation | |
| PNO-III-80-063, on 800331,unplanned Gaseous Radiation Release Occurred Because of Operator Error in Operating Valves. Preliminary Analysis Indicates Release Rates Did Not Exceed Tech Spec Limits | 1 April 1980 | PNO-III-80-063:on 800331,unplanned Gaseous Radiation Release Occurred Because of Operator Error in Operating Valves. Preliminary Analysis Indicates Release Rates Did Not Exceed Tech Spec Limits | |
| ML20126B545 | 25 January 1980 | PNS-III-80-002:800125,switchboard Operator Received Call Suggesting Facility Should Be Blown Up.Caller Allegedly Has Parts for Bomb.Resident Inspector Received Call Same Day.Increased Security Employed.No Disruption of Operation | |
| ML20249A672 | 6 October 1978 | PNS-78-049:on 781007,demonstration Will Take Place at Site. Licensee Will Have Its Full Complement of Guards on Duty Augmented by Zion Police Dept During Demonstration | |
| ML20216K153 | 18 July 1978 | PNO-78-135:on 780713,employee Alleged That Manual Operation of Sys Causing Unnecessary Radiation to Emplyees | |
| ML20249A739 | 3 April 1978 | PNS-78-015:on 780331,US Marshall Served Subpoena to Testify Before Grand Jury to Regional Director,Safeguards Branch Chief & Chief of Security & Investigations Section | |
| ML20126D190 | 12 August 1977 | PNO-77-143:Pacific Pump Co Supplied Facilities W/Production Lot of 40 Pumps Mfg Using Shafts Made of Inferior Matl. Cause Unstated.All Utils W/Pumps Were Notified.Nrc Headquarters Notified on 770812 | |
| ML20151Y205 | 19 July 1977 | PNO-77-131:on 770712,bypassing of Safety Signals Occurred. Pressurizer Pressure & SG Levels Remained Essentially Constant During Event.No Damage to Any Equipment Noted After Levels Restored to Normal | |
| ML20151X631 | 11 July 1977 | PNO-77-124:on 770710,Commonwealth Edison Reported That Unit 2 Reactor Scram Occurred Due to 2C SG Low Level Condition. Condition Caused by Loss of Feedwater Pump While Performing Maint on Feedwater Pump Lube Oil Filter Sys |