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| Issue date | Title | Topic | |
|---|---|---|---|
| PNO-III-99-001, on 990105,Unit 1 Station Auxiliary Transformer Exploded Ignited Oil Fire.Fire Extinguished within 15 Minutes by Onsite Fire Brigade.Unit 2 Operating at 60 Percent Power,Was Not Affected by Explosion & Fire | 6 January 1999 | PNO-III-99-001:on 990105,Unit 1 Station Auxiliary Transformer Exploded Ignited Oil Fire.Fire Extinguished within 15 Minutes by Onsite Fire Brigade.Unit 2 Operating at 60 Percent Power,Was Not Affected by Explosion & Fire | |
| PNO-III-98-051, on 981029,Prairie Island Unit 1 Automatically Tripped from 100 Percent Power Due to Negative Flux Rate Reactor Flux Rate Trip Signal.Nrc Resident Inspectors Are Monitoring Licensee Investigation & Repair Activities | 2 November 1998 | PNO-III-98-051:on 981029,Prairie Island Unit 1 Automatically Tripped from 100 Percent Power Due to Negative Flux Rate Reactor Flux Rate Trip Signal.Nrc Resident Inspectors Are Monitoring Licensee Investigation & Repair Activities | |
| PNO-III-98-032, on 980605,unit 1 Experienced Automatic Reactor Trip When Control Rod Dropped Into Reactor Core. Caused by Blown Fuse on Stationary Gripper Coil Due to Ground in Wiring to Coil | 9 June 1998 | PNO-III-98-032:on 980605,unit 1 Experienced Automatic Reactor Trip When Control Rod Dropped Into Reactor Core. Caused by Blown Fuse on Stationary Gripper Coil Due to Ground in Wiring to Coil | |
| PNO-III-98-011A, on 980124,licensee Shut Down Unit 2 to Investigate Reactor Coolant Leak Associated with Control Rod Drive Mechanism G-9.Licensee Identified Source of Leak as 3/4 Inch through-wall Crack in Manufacturing Weld | 13 February 1998 | PNO-III-98-011A:on 980124,licensee Shut Down Unit 2 to Investigate Reactor Coolant Leak Associated with Control Rod Drive Mechanism G-9.Licensee Identified Source of Leak as 3/4 Inch through-wall Crack in Manufacturing Weld | |
| PNO-III-98-011, on 980123,unidentified Leakage Increased by Approx 10 to 0.2 Gallons Per Minute.Licensee Began Preparations to Shut Down & Repair Leak in Canopy Seal | 26 January 1998 | PNO-III-98-011:on 980123,unidentified Leakage Increased by Approx 10 to 0.2 Gallons Per Minute.Licensee Began Preparations to Shut Down & Repair Leak in Canopy Seal | |
| PNO-III-97-053, on 970602,Unit 1 Experienced Automatic Reactor Trip from 100% Power,Due to Electrical Failure in One of Three Control Rod Control Cabinets.All Safety Sys Functioned as Designed & Reactor Stabilized in Hot Shutdown | 4 June 1997 | PNO-III-97-053:on 970602,Unit 1 Experienced Automatic Reactor Trip from 100% Power,Due to Electrical Failure in One of Three Control Rod Control Cabinets.All Safety Sys Functioned as Designed & Reactor Stabilized in Hot Shutdown | |
| PNO-III-97-047, on 970516,WI Energy Co & Northern States Power Co Announced They Were Terminating Plans for Proposed Merger of Two Companies Into New Co,Primergy Corp.Two Utils Issued News Releases on Decision | 19 May 1997 | PNO-III-97-047:on 970516,WI Energy Co & Northern States Power Co Announced They Were Terminating Plans for Proposed Merger of Two Companies Into New Co,Primergy Corp.Two Utils Issued News Releases on Decision | |
| PNO-III-88-091, on 881108,facility Shut Down for Condenser Repairs.Repair Work Includes Leak in Steam Line Inside Condenser Identified on 881103 & Condenser Tube Leak Observed on 881106 | 8 November 1988 | PNO-III-88-091:on 881108,facility Shut Down for Condenser Repairs.Repair Work Includes Leak in Steam Line Inside Condenser Identified on 881103 & Condenser Tube Leak Observed on 881106 | |
| PNO-III-88-020, on 880310,sample Results from Unit 1 Sump Indicated Small Amount of Reactor Coolant Leakage Showing Measurements of Less than 0.1 Gpm.Visual Insp Revealed Misting in Reactor Head.Region III Monitoring Situation | 11 March 1988 | PNO-III-88-020:on 880310,sample Results from Unit 1 Sump Indicated Small Amount of Reactor Coolant Leakage Showing Measurements of Less than 0.1 Gpm.Visual Insp Revealed Misting in Reactor Head.Region III Monitoring Situation | |
| 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-86-139, on 861129,licensee Received Offsite Call at Station Switchboard from Unidentified Male Indicating That Bomb Planted in Reactor Would Go Off in 5 Minutes.Station Search Initiated.No Bomb Found | 1 December 1986 | PNO-III-86-139:on 861129,licensee Received Offsite Call at Station Switchboard from Unidentified Male Indicating That Bomb Planted in Reactor Would Go Off in 5 Minutes.Station Search Initiated.No Bomb Found | |
| PNO-III-85-082, on 850917,bomb Threat Received.No Suspects Found.Threat Considered Hoax & No Plant Search Taken | 18 September 1985 | PNO-III-85-082:on 850917,bomb Threat Received.No Suspects Found.Threat Considered Hoax & No Plant Search Taken | |
| PNO-III-85-079, on 850907,unidentified Man Telephoned Threat That Bombs Planted Down River from Plant.Police Found No Bomb.Threat Considered Hoax by Licensee.State of Mn Will Be Informed | 9 September 1985 | PNO-III-85-079:on 850907,unidentified Man Telephoned Threat That Bombs Planted Down River from Plant.Police Found No Bomb.Threat Considered Hoax by Licensee.State of Mn Will Be Informed | |
| PNO-III-80-170, on 800904,efforts to Remove Bolts from Steam Generator Upper Supports Resulted in Breaking Two Bolts. Ultrasonic Examination of All of Bolts Identified Addl Defects.Cause Could Be Stress Corrosion Cracking | 5 September 1980 | PNO-III-80-170:on 800904,efforts to Remove Bolts from Steam Generator Upper Supports Resulted in Breaking Two Bolts. Ultrasonic Examination of All of Bolts Identified Addl Defects.Cause Could Be Stress Corrosion Cracking | |
| ML20126B730 | 19 February 1980 | PNS-III-80-003:on 800218,bomb Threat Was Received by Switchboard Operator.Search Conducted W/Negative Results | |
| ML20151X835 | 22 September 1977 | PNO-77-165:as of 770921,approx 675 Tubes Were Examined in C SG & Results Indicated That as Many as 100 Tubes in SG Might Have to Be Removed from Svc Due to Thinning of Tube Wall in Area Where Old anti-vibration Bars Left in Place | |
| ML20236J735 | 26 July 1976 | PNS-76-034:on 760724,group of 18 Marchers Called Walk for Disarmament & Social Justice Attempted to Enter Prairie Island Plant Site.Licensee Stopped Marchers at Company Property Line.Three Marchers Arrested for Trespassing | |
| ML20249B183 | 26 March 1976 | PNO-76-052:on 760325,representative of St Paul Minnesota Area OSHA Office Received Telcon from Pipefitter Employed by Piping Contractor Working at Plant,To Complain About Rate Permissible Quarterly Radiation Exposure Begin Accumulated | |
| ML20236V373 | 28 August 1975 | PN-75-078:on 750827,unplanned Radioactive Liquid Release from Turbine Bldg Sump to Discharge Cooling Canal.Samples of Canal Water & River Water Upstream & Downstream Confirmed Only Background Activity Existed.Follow Up in Progress |