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| Issue date | Title | Topic | |
|---|---|---|---|
| PNO-IV-89-055, on 890829,Board of Directors Directed Termination of Nuclear Operations at Facility for 100-day Cooldown Period in Preparation for 30-month Reactor Defueling.Nrc Currently Reviewing Defueling Safety Analysis | 29 August 1989 | PNO-IV-89-055:on 890829,Board of Directors Directed Termination of Nuclear Operations at Facility for 100-day Cooldown Period in Preparation for 30-month Reactor Defueling.Nrc Currently Reviewing Defueling Safety Analysis | |
| PNO-IV-89-052C, updates 890818,21 & 23 Unplanned Reactor Shutdowns Due to Inoperable Control Rod.Control Rod Assembly Will Be Removed Using Bldg Crane.Aluminum Shutter Will Be Remotely Placed on Bottom of Canister | 25 August 1989 | PNO-IV-89-052C:updates 890818,21 & 23 Unplanned Reactor Shutdowns Due to Inoperable Control Rod.Control Rod Assembly Will Be Removed Using Bldg Crane.Aluminum Shutter Will Be Remotely Placed on Bottom of Canister | |
| PNO-IV-89-052B, on 890823,unplanned Reactor Shutdown Due to Inoperable Control Rod.Licensee Plans to Remove Control Rod Pair W/Bldg Crane in Unshielded Configuration to Shielded, Contained Evolution | 23 August 1989 | PNO-IV-89-052B:on 890823,unplanned Reactor Shutdown Due to Inoperable Control Rod.Licensee Plans to Remove Control Rod Pair W/Bldg Crane in Unshielded Configuration to Shielded, Contained Evolution | |
| PNO-IV-89-052A, on 890818,after Attempting to Withdraw & Insert Control Rod Pair from Region 19,control Rod Motor Stopped Drawing Current & Indicated Open Conductor or Thermal Overload.Pair Will Be Withdrawn Using Bldg Crane | 21 August 1989 | PNO-IV-89-052A:on 890818,after Attempting to Withdraw & Insert Control Rod Pair from Region 19,control Rod Motor Stopped Drawing Current & Indicated Open Conductor or Thermal Overload.Pair Will Be Withdrawn Using Bldg Crane | |
| PNO-IV-89-052, on 890817,unplanned Reactor Shutdown Due to Inoperable Control Rod Drive Occurred.Attempts to Clear Cause of Slack Cable Light Failed.Loop 2 Shutdown Due to Upset in Bearing Water Sys Occurred During Plant Shutdown | 18 August 1989 | PNO-IV-89-052:on 890817,unplanned Reactor Shutdown Due to Inoperable Control Rod Drive Occurred.Attempts to Clear Cause of Slack Cable Light Failed.Loop 2 Shutdown Due to Upset in Bearing Water Sys Occurred During Plant Shutdown | |
| PNO-IV-89-044, on 890628,pressure in Waste Gas Receiver a Decreased from 250 Psig & Pressure in Receiver a Decreased from 60 to 50 Psig.Caused by Erroneous Valve Lineup.Plant Stack Monitors Did Not Alarm | 28 June 1989 | PNO-IV-89-044:on 890628,pressure in Waste Gas Receiver a Decreased from 250 Psig & Pressure in Receiver a Decreased from 60 to 50 Psig.Caused by Erroneous Valve Lineup.Plant Stack Monitors Did Not Alarm | |
| PNO-IV-89-040, from 890622-23,power Exceeded 82% & Secondary Heat Balance Indication in Control Room Read Approx 79.2%.On 890623,discovered Incorrect Input Into Secondary Heat Balance Calculation.Power Reduced to 65% Pending Evaluation | 23 June 1989 | PNO-IV-89-040:from 890622-23,power Exceeded 82% & Secondary Heat Balance Indication in Control Room Read Approx 79.2%.On 890623,discovered Incorrect Input Into Secondary Heat Balance Calculation.Power Reduced to 65% Pending Evaluation | |
| PNO-IV-89-036, on 890529,two Teenagers Shot by off-duty Security Guard Following Confrontation Re Assault.Guard Arrested & Being Held for Murder.Licensee Plans to Issue Press Release.State of Co Will Be Informed.Record Copy | 30 May 1989 | PNO-IV-89-036:on 890529,two Teenagers Shot by off-duty Security Guard Following Confrontation Re Assault.Guard Arrested & Being Held for Murder.Licensee Plans to Issue Press Release.State of Co Will Be Informed.Record Copy | |
| PNO-IV-89-031, on 890427,CRD 3 Failed to Insert on Scram During Performance of Weekly Partial Insertion Scram Tests. Troubleshooting Confirmed That CRD Brake Deenergized & That Rod Out Limit Cleared.Licensee Plans to Replace CRDs 3 & 7 | 28 April 1989 | PNO-IV-89-031:on 890427,CRD 3 Failed to Insert on Scram During Performance of Weekly Partial Insertion Scram Tests. Troubleshooting Confirmed That CRD Brake Deenergized & That Rod Out Limit Cleared.Licensee Plans to Replace CRDs 3 & 7 | |
| PNO-IV-88-054, on 880705,reactor Shut Down to Commence 99-day Planned Outage to Replace Fasteners Associated W/Helium Circulators.Licensee Schedule Calls for Return to Operations on 881007.Region IV Prepared to Respond to Media Inquiries | 6 July 1988 | PNO-IV-88-054:on 880705,reactor Shut Down to Commence 99-day Planned Outage to Replace Fasteners Associated W/Helium Circulators.Licensee Schedule Calls for Return to Operations on 881007.Region IV Prepared to Respond to Media Inquiries | |
| PNO-IV-88-025, on 880404,following Manual Reactor Scram, Unplanned Release of Noble Gas Occurred When Relief Valve Opened to Relieve Pressure in Vent Line Between the Core Support Floor & Waste Gas Sys | 5 April 1988 | PNO-IV-88-025:on 880404,following Manual Reactor Scram, Unplanned Release of Noble Gas Occurred When Relief Valve Opened to Relieve Pressure in Vent Line Between the Core Support Floor & Waste Gas Sys | |
| PNO-IV-88-011, on 880210,helium Circulator Tripped Due to Erroneous Low Speed Signal W/Reactor at 75% Power.Reactor Operators Manually Srammed Reactor from 25% Power W/One Helium Circulator Running.State of Co Informed | 11 February 1988 | PNO-IV-88-011:on 880210,helium Circulator Tripped Due to Erroneous Low Speed Signal W/Reactor at 75% Power.Reactor Operators Manually Srammed Reactor from 25% Power W/One Helium Circulator Running.State of Co Informed | |
| PNO-IV-87-052, on 871002,reactor Tripped Due to Loss of Both Reactor Coolant Flow Loops Due to Fire in Turbine Bldg. Caused by Failure of Hydraulic Sys Filter.Reactor Manually Tripped,Alert Declared & Fire Extinguished | 5 October 1987 | PNO-IV-87-052:on 871002,reactor Tripped Due to Loss of Both Reactor Coolant Flow Loops Due to Fire in Turbine Bldg. Caused by Failure of Hydraulic Sys Filter.Reactor Manually Tripped,Alert Declared & Fire Extinguished | |
| PNO-IV-87-035, licensee Initiated Plant Shutdown,Estimated to Last Approx 35 Days,To Replace Helium Coolant Circulation 1D.Circulation Developed Wobble & Penetration Interspace Seal Leak of Purified Helium.State of Co Will Be Informed | 29 July 1987 | PNO-IV-87-035:licensee Initiated Plant Shutdown,Estimated to Last Approx 35 Days,To Replace Helium Coolant Circulation 1D.Circulation Developed Wobble & Penetration Interspace Seal Leak of Purified Helium.State of Co Will Be Informed | |
| PNO-IV-87-025, on 870427,received Permission to Take Reactor at Power Levels Above 10%.On 870430,generator Synchronized W/Grid.Licensee Will Conduct Operations at Less than 35% Power Until Certain Technical Issues Resolved | 1 May 1987 | PNO-IV-87-025:on 870427,received Permission to Take Reactor at Power Levels Above 10%.On 870430,generator Synchronized W/Grid.Licensee Will Conduct Operations at Less than 35% Power Until Certain Technical Issues Resolved | |
| PNO-IV-87-020, augmented Insp of Low Power Operations Led Region to Conclude That Plant Being Operated in Prof & Conservative Manner.Licensee Conducting Surveillance Testing | 24 April 1987 | PNO-IV-87-020:augmented Insp of Low Power Operations Led Region to Conclude That Plant Being Operated in Prof & Conservative Manner.Licensee Conducting Surveillance Testing | |
| PNO-IV-87-018, on 870417,reactor Taken Critical.First Criticality Since Reactor Shut Down on 860531 for Outage to Make Mods.Plant Under 10% Power Restriction for Operator Effectiveness Evaluation & Drying Out of Reactor Core | 17 April 1987 | PNO-IV-87-018:on 870417,reactor Taken Critical.First Criticality Since Reactor Shut Down on 860531 for Outage to Make Mods.Plant Under 10% Power Restriction for Operator Effectiveness Evaluation & Drying Out of Reactor Core | |
| PNO-IV-87-019, former Manager of Nuclear Production Convicted & Sentenced to 3 Yrs.Conviction Resulted from Guilty Plea & Plea Bargaining.Three Others Indicted at Same Time for Related Offences Have Not Yet Come to Trial | 17 April 1987 | PNO-IV-87-019:former Manager of Nuclear Production Convicted & Sentenced to 3 Yrs.Conviction Resulted from Guilty Plea & Plea Bargaining.Three Others Indicted at Same Time for Related Offences Have Not Yet Come to Trial | |
| PNO-IV-86-029, util Announced Expense Write Down of Company Assets in Amount of $75-100 Million,Study of Alternatives Re Future Operations & Approval of Settlement Agreement W/ Litigating Parties in Suits Before State of Co | 24 September 1986 | PNO-IV-86-029:util Announced Expense Write Down of Company Assets in Amount of $75-100 Million,Study of Alternatives Re Future Operations & Approval of Settlement Agreement W/ Litigating Parties in Suits Before State of Co | |
| ML20212P001 | 25 August 1986 | PNS-IV-86-002:on 860822,determined That During June 1986 Security Watchman Entered & Exited Site w/22-caliber Handgun Hidden in Boot.Site Access of Individual Terminated & Investigation Underway.Personnel Being Hand Searched | |
| PNO-IV-86-012, on 860411,turbine Trip Occurred Due to Faulty electro-hydraulic Control (EHC) Card Following Synchronization W/Grid for First Time Since June 1984.EHC Card Repaired & Plant Returned to Grid on 860412 | 14 April 1986 | PNO-IV-86-012:on 860411,turbine Trip Occurred Due to Faulty electro-hydraulic Control (EHC) Card Following Synchronization W/Grid for First Time Since June 1984.EHC Card Repaired & Plant Returned to Grid on 860412 | |
| PNO-IV-85-010, on 860403,noble Gas Release of 96 Mci Over 1 H Period Occurred.Caused by Helium Circulators & Purification Sys Loss Due to Partial Loss of Offsite Power During Blizzard.Power Restored | 3 April 1986 | PNO-IV-85-010:on 860403,noble Gas Release of 96 Mci Over 1 H Period Occurred.Caused by Helium Circulators & Purification Sys Loss Due to Partial Loss of Offsite Power During Blizzard.Power Restored | |
| PNO-IV-85-037A, on 850721,criticality Achieved.Crd Assemblies Refurbished & Bolting in All Four Circulators & Reserve Shutdown Hopper Matl Replaced During Prolonged Shutdown Since 840623 | 22 July 1985 | PNO-IV-85-037A:on 850721,criticality Achieved.Crd Assemblies Refurbished & Bolting in All Four Circulators & Reserve Shutdown Hopper Matl Replaced During Prolonged Shutdown Since 840623 | |
| PNO-IV-85-037, on 850719,confirmation of Action Ltr Issued Permitting Reactor to Return to Operation at Power Levels Not to Exceed 15% of Rated Power,Pending Resolution of Questions Re Equipment Qualification | 19 July 1985 | PNO-IV-85-037:on 850719,confirmation of Action Ltr Issued Permitting Reactor to Return to Operation at Power Levels Not to Exceed 15% of Rated Power,Pending Resolution of Questions Re Equipment Qualification | |
| PNO-IV-84-014A, on 840626,licensee Committed to Maintain Fort St Vrain in Shutdown Condition Until Cause of Failure of Six Rod Pairs to Drop on Reactor Trip Identified,Corrective Measures Taken & NRC Authorizes Return to Operations | 27 June 1984 | PNO-IV-84-014A:on 840626,licensee Committed to Maintain Fort St Vrain in Shutdown Condition Until Cause of Failure of Six Rod Pairs to Drop on Reactor Trip Identified,Corrective Measures Taken & NRC Authorizes Return to Operations | |
| PNO-IV-84-014, on 840623,reactor Tripped on High Pressure Signal & 6 of 7 Control Rod Pairs Failed to Drop.Cause Unknown.Drive Mechanisms Will Be Removed for Exam | 25 June 1984 | PNO-IV-84-014:on 840623,reactor Tripped on High Pressure Signal & 6 of 7 Control Rod Pairs Failed to Drop.Cause Unknown.Drive Mechanisms Will Be Removed for Exam | Shutdown Margin |
| PNO-IV-80-010, on 800304,hydraulic Oil Fire Occurred in Turbine Bay.Caused by Hydraulic Oil Leakage from Valve Flange on to Hot Steam Traps.Fire Extinguished Immediately by Security Guard.Platteville Fire Dept Notified | 5 March 1980 | PNO-IV-80-010:on 800304,hydraulic Oil Fire Occurred in Turbine Bay.Caused by Hydraulic Oil Leakage from Valve Flange on to Hot Steam Traps.Fire Extinguished Immediately by Security Guard.Platteville Fire Dept Notified | |
| PNO-IV-80-009, on 800228,State of Co Will Conduct Emergency Response Exercise to Test State & Local Emergency Plans. Members of Interagency Regional Advisory Committee & Region 4 Will Observe & Critique Exercise | 25 February 1980 | PNO-IV-80-009:on 800228,State of Co Will Conduct Emergency Response Exercise to Test State & Local Emergency Plans. Members of Interagency Regional Advisory Committee & Region 4 Will Observe & Critique Exercise | |
| ML20213C926 | 13 April 1979 | Correction to PNO-79-67T.Radiation Activity for Soil & Vegetation Samples on Page 2 Corrected | |
| ML20217A331 | 1 December 1978 | PNO-78-200:on 781129,plant Encountered Helium Circulator Auxiliary,Buffer-Mid-Buffer Mismatch.Cause by Opening of Low Pressure Separator Safety Relief Valve Which Released Quantity of Reactor Coolant | |
| ML20249A746 | 26 April 1978 | PNS-78-018:on 780429-0501,according to Media Accounts & Other Info Received by Nrc,Antinuclear Demonstrations May Occur at Fort St Vrain in Colorado.Protestors Intend to Plant Spiderwort Flowers Adjacent to Nuclear Site | |
| ML20248J884 | 29 March 1978 | PNO-78-067:on 780123,util Authorized to Operate Fort St Vrain Station at Power Levels Up to 70% of Design Rating | |
| ML20248L067 | 9 February 1978 | PNO-78-026,util Public Svc Co of Co Authorized by NRC to Operate Fort St Vrain Plant Up to Power Level of 2% of Rated Power to Dry Reactor Core & Stabilize Primary System Chemistry | |
| ML20249A082 | 24 January 1978 | PNO-78-011A:on 780123,NRC Inspectors Verified Total Radioactivity Release to Environs Was Approx 4 Curies, Primarily Consisting of Noble Gases.Plant Remains in Normal Shutdown Condition | |
| ML20249A089 | 23 January 1978 | PNO-78-011:on 780123,release of Gaseous Radioactive Matl Offsite from Ft St Vrain NPP Near Platteville,Co.Cause of Release Reported to Be Failure of Buffer Seal in Helium Circulation Sys | |
| ML20207G405 | 12 December 1977 | PNO-77-215:on 771130,St Vrain Facility Shutdown Due to High Moisture in Primary Sys.Evaluations Prior to Shutdown, Indicated Leakage Associated with Loop 1 of Primary Sys. Steam Generator Leak Suspected | |
| ML20249A870 | 20 April 1977 | PNS-77-018:on 770419,Region IV Insp & Enforcement Inspector Gained Entry Into Reactor Bldg W/O Security Challenge & Contrary to Facility Existing Security Program.Licensee Does Not Plan to Issue Press Release | |
| ML20249B492 | 2 July 1976 | PNO-76-109:on 760701,Fort St Vrain Facility Was Taken Critical.Facility Had Been in Shutdown Condition Since May 1975 for Corrective Actions for Electrical Cable Routing Deficiencies | |
| ML20236V359 | 28 August 1975 | PN-75-077:on 750826,intentional Unauthorized Interchange of Electrical Cables Was Identified.Recorder Inputs for Ph/ Conductivity for SG Feedwater Was Found Reversed |