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| Issue date | Title | Topic | |
|---|---|---|---|
| PNO-I-99-048, on 991022,operators Initiated Plant Shutdown from 100% Reactor Power,Due to Continued RCS Leakage Through B Pressurizer Code Safety Valve to Primary Relief Tank. Operators Are Reducing Reactor Power at 12% Per H | 22 October 1999 | PNO-I-99-048:on 991022,operators Initiated Plant Shutdown from 100% Reactor Power,Due to Continued RCS Leakage Through B Pressurizer Code Safety Valve to Primary Relief Tank. Operators Are Reducing Reactor Power at 12% Per H | |
| PNO-I-99-036, on 990718,update to Beaver Valley,Unit 2 Forced Outage Made.Licensee Replaced Suspected Voltage Regulator Control Relays & Satisfactorily Retested EDG 2-2.Resident Inspectors Continue to Monitor Licensee Corrective Action | 26 July 1999 | PNO-I-99-036:on 990718,update to Beaver Valley,Unit 2 Forced Outage Made.Licensee Replaced Suspected Voltage Regulator Control Relays & Satisfactorily Retested EDG 2-2.Resident Inspectors Continue to Monitor Licensee Corrective Action | Zebra Mussel |
| PNO-I-99-033, on 990716,apparent Electrical Fault Occurred During EDG Full Load Test,Which Opened Supply Breaker Between Emergency & Normal 4 Kilovolt Busses.Station Personnel Intend to Resolve & Correct Electrical Fault | 19 July 1999 | PNO-I-99-033:on 990716,apparent Electrical Fault Occurred During EDG Full Load Test,Which Opened Supply Breaker Between Emergency & Normal 4 Kilovolt Busses.Station Personnel Intend to Resolve & Correct Electrical Fault | Zebra Mussel |
| PNO-I-98-002, on 980130,operators Declared Both Trains of Component Cooling Reactor & Reactor Plant River Water Sys Inoperable Due to Failure to Meet TS Surveillance Testing Requirements.Entered TS 3.0.3 & 4.0.3 | 2 February 1998 | PNO-I-98-002:on 980130,operators Declared Both Trains of Component Cooling Reactor & Reactor Plant River Water Sys Inoperable Due to Failure to Meet TS Surveillance Testing Requirements.Entered TS 3.0.3 & 4.0.3 | Enforcement Discretion |
| PNO-I-97-077, on 971216,Duquesne Light Co Initiated Unit 2 Reactor Shutdown in Accordance W/Ts 3.0.3.Licensee Plans to Address Unit 2 Design Deficiency for CR Emergency Air Cleanup & Pressurization,During Shutdown | 17 December 1997 | PNO-I-97-077:on 971216,Duquesne Light Co Initiated Unit 2 Reactor Shutdown in Accordance W/Ts 3.0.3.Licensee Plans to Address Unit 2 Design Deficiency for CR Emergency Air Cleanup & Pressurization,During Shutdown | |
| PNO-I-97-040, on 970627,Unit 1 RPS Trip Functions Did Not Meet Design Requirements & Were Inoperable.Licensee Intends to Install Design Change to Resolve IEEE-279 Postulated Failure Concerns.Operators Began TS Required Shutdown | 30 June 1997 | PNO-I-97-040:on 970627,Unit 1 RPS Trip Functions Did Not Meet Design Requirements & Were Inoperable.Licensee Intends to Install Design Change to Resolve IEEE-279 Postulated Failure Concerns.Operators Began TS Required Shutdown | |
| PNO-I-97-020, on 970407,Allegheny Power Sys Inc & Dqe Inc, Parent Co of Duquesne Light Co,Announced Billion Dollar Agreement to Merge Companies.Merger Unanimously Approved by Both Companies Boards of Directors | 7 April 1997 | PNO-I-97-020:on 970407,Allegheny Power Sys Inc & Dqe Inc, Parent Co of Duquesne Light Co,Announced Billion Dollar Agreement to Merge Companies.Merger Unanimously Approved by Both Companies Boards of Directors | |
| PNO-I-97-017, on 970319,Units 1 & 2 Experienced Dual Unit Reactor Trip from Full Power Due to Electrical Fault Protection Signal from 345 Kv Bus in Onsite Switchyard. Signal Tripped Both Main Generators | 20 March 1997 | PNO-I-97-017:on 970319,Units 1 & 2 Experienced Dual Unit Reactor Trip from Full Power Due to Electrical Fault Protection Signal from 345 Kv Bus in Onsite Switchyard. Signal Tripped Both Main Generators | |
| PNO-I-97-001, on 970106,unit 2 Experienced Reactor Trip from 98% Power Due to Turbine Trip.All Control Rods Inserted Completely.Auxiliary Feedwater Sys Started on Low SG Water Level Signal as Expected.Plant Remains Stable in Mode 3 | 8 January 1997 | PNO-I-97-001:on 970106,unit 2 Experienced Reactor Trip from 98% Power Due to Turbine Trip.All Control Rods Inserted Completely.Auxiliary Feedwater Sys Started on Low SG Water Level Signal as Expected.Plant Remains Stable in Mode 3 | |
| PNO-I-93-061A, on 931119,determined That Util Adequately Met Commitments in CAL 1-93-20,dtd 931109.Determination Based on Completed Actions & Tests Which Demonstrated Reasonable Assurance That Both EDG Sequencers Operable & Reliable | 22 November 1993 | PNO-I-93-061A:on 931119,determined That Util Adequately Met Commitments in CAL 1-93-20,dtd 931109.Determination Based on Completed Actions & Tests Which Demonstrated Reasonable Assurance That Both EDG Sequencers Operable & Reliable | |
| PNO-I-93-061, on 931104 & 1106,EDG Number 1 & 2,failed auto-load Test When Loads Did Not Sequence on Emergency Bus During Simulated Loss of Offsite Power W/Safety Injection Signal.Ait Sent to Review Circumstances | 9 November 1993 | PNO-I-93-061:on 931104 & 1106,EDG Number 1 & 2,failed auto-load Test When Loads Did Not Sequence on Emergency Bus During Simulated Loss of Offsite Power W/Safety Injection Signal.Ait Sent to Review Circumstances | |
| PNO-V-90-038, A:on 900927,main Generator Trip Resulted in Unplanned Plant Shutdown.Transient Caused 140 MW Excursion on Grid,Tripped Off Nearby Substation & Shook Turbine Bldg Deck.Ge Contacted for Recommendations | 27 September 1990 | PNO-V-90-038-A:on 900927,main Generator Trip Resulted in Unplanned Plant Shutdown.Transient Caused 140 MW Excursion on Grid,Tripped Off Nearby Substation & Shook Turbine Bldg Deck.Ge Contacted for Recommendations | |
| PNO-I-90-070, on 900830,licensee Declared Alert Following Apparent Release of CO2 Gas Into Several Spaces.Isolation Valve Apparently Leaked.Licensee Immediately Dispatched Onsite Fire Brigade in self-contained Breathing Apparatus | 30 August 1990 | PNO-I-90-070:on 900830,licensee Declared Alert Following Apparent Release of CO2 Gas Into Several Spaces.Isolation Valve Apparently Leaked.Licensee Immediately Dispatched Onsite Fire Brigade in self-contained Breathing Apparatus | |
| PNO-I-89-046, on 890621,unusual Event Declared Due to Plant Shutdown,Necessitated by Excessive RCS Leakage Into C Steam Generator,During Which Auxiliary Feedwater Auto Start & Auto Isolation Experienced.Generator Levels Reestablished | 22 June 1989 | PNO-I-89-046:on 890621,unusual Event Declared Due to Plant Shutdown,Necessitated by Excessive RCS Leakage Into C Steam Generator,During Which Auxiliary Feedwater Auto Start & Auto Isolation Experienced.Generator Levels Reestablished | |
| PNO-I-89-043, on 890607,unit Declared Unusual Event Due to Excessive RCS Leakage & Initiated Tech Spec Required Shutdown.Leak Stopped.Facility Stabilized at About 20% Power & Monitoring Plant Parameters to Confirm That Leak Stopped | 7 June 1989 | PNO-I-89-043:on 890607,unit Declared Unusual Event Due to Excessive RCS Leakage & Initiated Tech Spec Required Shutdown.Leak Stopped.Facility Stabilized at About 20% Power & Monitoring Plant Parameters to Confirm That Leak Stopped | |
| PNO-I-88-086, on 880822,Unit 2 Experienced one-out-of-three Actuation of Chlorine Detection Sys.Unit 1 Actuated on two-out-of-three Coincidence.Bottled Air Pressurization Sys Began to Discharge Into Control Room.Addl Tests Performed | 23 August 1988 | PNO-I-88-086:on 880822,Unit 2 Experienced one-out-of-three Actuation of Chlorine Detection Sys.Unit 1 Actuated on two-out-of-three Coincidence.Bottled Air Pressurization Sys Began to Discharge Into Control Room.Addl Tests Performed | |
| PNO-I-87-107, on 871117,turbine Reactor Tripped Due to Spuriously Generated Turbine Thrust Bearing Trip.Caused by Technician Inadvertently Tripping Power Switch on Turbine Rotor Position Drawer.Offsite Transformer Inspected | 18 November 1987 | PNO-I-87-107:on 871117,turbine Reactor Tripped Due to Spuriously Generated Turbine Thrust Bearing Trip.Caused by Technician Inadvertently Tripping Power Switch on Turbine Rotor Position Drawer.Offsite Transformer Inspected | |
| PNO-I-87-073, on 870803,reactor Trip Breakers Shut to Commence Approach to Initial Criticality.Criticality Achieved on 870804.Insp Team on Site Providing Continuous Coverage Throughout Low Power Physics Testing | 4 August 1987 | PNO-I-87-073:on 870803,reactor Trip Breakers Shut to Commence Approach to Initial Criticality.Criticality Achieved on 870804.Insp Team on Site Providing Continuous Coverage Throughout Low Power Physics Testing | |
| PNO-I-87-016, on 870310-11 Commissioner KM Carr Will Visit Plant.Agenda Consists of Briefing & Tour | 9 March 1987 | PNO-I-87-016:on 870310-11 Commissioner KM Carr Will Visit Plant.Agenda Consists of Briefing & Tour | |
| ML20210E964 | 6 February 1987 | PNS-I-87-001:on 870206,site Telephone Operator Received Anonymous Call Stating That Three Bombs Placed in Facility. Bomb Threat Procedure & Security Survey Initiated | |
| ML20212B181 | 22 December 1986 | PNS-I-86-024:on 861218,discovered Power Available Indicator for One of Six safety-related Auxiliary Feedwater Valves Dark.Caused by Security Guard Tampering W/Breaker Device.Guard Suspended Pending Completion of Investigation | |
| ML20211E295 | 17 October 1986 | PNS-I-86-019:on 861016,contractor Providing Security Svcs for Plant Changed from Burns Intl Security Svcs to Security Bureau,Inc.Licensee Advised NRC of Proposed Change During 861014 Meeting | |
| PNO-I-86-079, on 860926,facility Switchboard Operator Received Bomb Threat by Telephone.Reactor Bldg Evacuated. Licensee Will Resume Work in Reactor Bldg,If No Bomb Found | 26 September 1986 | PNO-I-86-079:on 860926,facility Switchboard Operator Received Bomb Threat by Telephone.Reactor Bldg Evacuated. Licensee Will Resume Work in Reactor Bldg,If No Bomb Found | |
| PNO-I-86-071, on 860911,bomb Threats Received by Telephone. Nonessential Personnel Released & Bldg Searched | 11 September 1986 | PNO-I-86-071:on 860911,bomb Threats Received by Telephone. Nonessential Personnel Released & Bldg Searched | |
| PNO-I-86-070, on 860905,telephone Bomb Threat Received for Unit 2.Fuel Bldgs of Both Units Evacuated & Searched.No Bomb Found.Info Assessment Team & Commonwealth of PA Notified | 5 September 1986 | PNO-I-86-070:on 860905,telephone Bomb Threat Received for Unit 2.Fuel Bldgs of Both Units Evacuated & Searched.No Bomb Found.Info Assessment Team & Commonwealth of PA Notified | |
| PNO-I-85-083, on 851031,unmonitored Release of 1,600 Gallons Radioactive Water from Unit 1 Boric Acid Holding Tank Occurred.Caused by Personnel Error.Leak Isolated & Sewers Monitored.Unit 2 Worker Contaminated on Shoe | 31 October 1985 | PNO-I-85-083:on 851031,unmonitored Release of 1,600 Gallons Radioactive Water from Unit 1 Boric Acid Holding Tank Occurred.Caused by Personnel Error.Leak Isolated & Sewers Monitored.Unit 2 Worker Contaminated on Shoe | Boric Acid |
| PNO-I-85-062, on 850829,at 100% Power,Reactor Tripped & Safety Injection Occurred.Caused by Broken Pipe Fitting on Instrument Air Compressor Tank in Turbine Bldg.Pressurizer Pressure Restored to Normal | 29 August 1985 | PNO-I-85-062:on 850829,at 100% Power,Reactor Tripped & Safety Injection Occurred.Caused by Broken Pipe Fitting on Instrument Air Compressor Tank in Turbine Bldg.Pressurizer Pressure Restored to Normal | |
| PNO-I-85-051A, on 850717,diesel Generator 1 Failed Monthly Surveillance Test.Initially Attributed to Possible Tampering W/Load Limit Setting Knob.Investigation Concluded That Knob May Have Been Inadvertently Moved During Cleaning | 25 July 1985 | PNO-I-85-051A:on 850717,diesel Generator 1 Failed Monthly Surveillance Test.Initially Attributed to Possible Tampering W/Load Limit Setting Knob.Investigation Concluded That Knob May Have Been Inadvertently Moved During Cleaning | |
| PNO-I-85-051, on 850717,diesel Generator 1 Failed Monthly Surveillance Test Due to Woodward Governor Load Limit Setting Being Set at 3,instead of Normal Setting of 10. Caused by Possible Tampering W/Generator Setting | 18 July 1985 | PNO-I-85-051:on 850717,diesel Generator 1 Failed Monthly Surveillance Test Due to Woodward Governor Load Limit Setting Being Set at 3,instead of Normal Setting of 10. Caused by Possible Tampering W/Generator Setting | |
| ML20148D761 | 9 October 1979 | PNS-I-79-001A:on 791008,licensee & Ibew Union Committee Reached Tentative Agreement on New Contract.Licensee Believes New Contract Will Be Ratified Thereby Avoiding Strike | |
| ML20249A631 | 7 August 1978 | PNS-78-038:on 780804,phone Call Was Received at Plant Welding Shop.Unidentified Person Stated That Bomb Was in Power House & Hung Up.Site Was Not Evacuated.Cursory Search Was Conducted | |
| ML20207G639 | 17 November 1977 | PNO-77-202:on 771116,facilty Shutdown from 100 Percent Power to Investigate Noises Which Developed in Main Generator. Exams Performed on 771116 Revealed That Hot Hydrogen Gas Return Duct Inside Generator Had Loosened | |
| ML20151X490 | 24 August 1977 | PNO-77-148:on 770823,licensee Discovered That Small Amounts of Radioactive,Borated Water Had Been Leaking from Unit 1 Auxiliary Bldg Via Concrete Trench to Unit 2 Construction Area for Undetermined Time | Boric Acid |
| 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 | |
| ML20151X757 | 26 July 1977 | PNO-77-134:on 770725,primary Water Storage Tank Overflowed During Filling Operation & Dumped 9000 Gallons of Slightly Radioactive Water Onto Ground.Unplanned Release Caused by Valving Error During Tank Filling Operation | |
| ML20151U924 | 9 June 1977 | PNO-77-100:on 770608,makeup Water from Primary Water Storage Tank Contaminated Plant Water Treatment Sys Which Provides Inplant Domestic Water.Licensee Posted All Domestic Water Outlets (Drinking Fountains & Lavoratories) | |
| ML20151U642 | 21 April 1977 | PNO-77-064:on 770420,plant Shutdown Due to Inadvertent MSIV Closure,Caused Safety Injection Signal & Plant Trip.Nrc Inspector or Site Reviewing Licensee Findings.Press Release Not Planned | |
| ML20236L035 | 6 January 1977 | PNO-77-004:on 770105,plant Automatically Scrammed,Steam Flow Feed Flow Mismatch,From 54 Percent Power When Feedwater Line Vibration Experienced.Licensee Determining Extent of Damage Which Occurred | |
| ML20236F322 | 27 December 1976 | PNO-76-225:on 761227,plant Was Shutdown When Feedline Vibration Was Experienced.Power Level at Time of Disturbance Was Approx 75%.Licensee Determining Extent of Damage as Result of Event.Commonwealth of Pennsylvania Informed | |
| ML20236F265 | 8 November 1976 | PNO-76-186:on 761105,rumbling Was Heard in Operating Areas & Guard House.Drain Line 3/4 Inch on AFW Line to B SG Had Failed.Licensee Plans to Have Westinghouse & Stone & Webster Analyze Event to Determine Cause | Nondestructive Examination |
| ML20236F512 | 16 July 1976 | PNS-76-032:on 760716,Shippingport Police Received Phone Call Advising That Two Bombs Were in Conventional Power Plant; One Bomb in Stack & One in Power House.Midland Police Dept Advised of Call & in Turn Advised Licensee | |
| ML20249B510 | 18 June 1976 | PNO-76-105:on 760617,7,000 Gallons of Water Leaked to Containment from 3/8 Inch Flexible Pressure Hose in RCS Pressure Transmitter Line.Appears That Operators Failed to Respond to Sump Pump Alarms & Addl Pump Operation | |
| ML20249B326 | 11 May 1976 | PNO-76-084:on 760510,initial Criticality Achieved.Region 1 Inspector Witnessed Evolution & Repts That Actual Boron Concentration in Close Agreement W/Predicted Values.Media Interest Expected Because of Close Attention to Plant |