Pages that link to "PNO-V-86-094, on 861224,facility Tripped from 100% Power. Cause Believed to Be Electrical Malfunction on Vital Bus B. Definitive Cause of Malfuncion Under Investigation.Unit Will Be Maintained in Mode 3 Until Cause Identified"
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The following pages link to PNO-V-86-094, on 861224,facility Tripped from 100% Power. Cause Believed to Be Electrical Malfunction on Vital Bus B. Definitive Cause of Malfuncion Under Investigation.Unit Will Be Maintained in Mode 3 Until Cause Identified:
Displayed 50 items.
- PNO-V-85-068, on 851003,while Operating at 50% Power,Reactor Trip Occurred After Loss of Electric Power.Three Reactor Coolant Pumps Restarted by Resetting Pump Circuit Breaker Lockout Relays.Cause Under Investigation (← links)
- PNO-V-86-003, on 860109,during Full Power Turbine Trip Test Following Turbine Trip/Reactor Trip,Electrical Buses Which Supply Power to Reactor Coolant Pumps Failed to Transfer to Alternate Source.Restart Plans Unknown (← links)
- PNO-V-85-076, on 851108,licensee Reported That Studs in RCS Line Stops a & B Did Not Meet Hardness Requirements.Relief from 10CFR50,App A,Gdc 4 Requested to Preclude Retorquing Studs (← links)
- PNO-V-85-058, on 850912,unusual Event Declared After Main Turbine Tripped During Load Rejection Test.Low Voltage Tripped Reactor Coolant Pumps.Overcooling RCS Caused Decrease in Safety Injection Setpoint (← links)
- PNO-V-85-088, on 851216,ventilation Fan in Train a balance- of-plant ESFAS Auxiliary Relay Cabinet Tripped Off & Caused Cabinet to Overheat.Trip Resulted in Logic Cards Malfunctioning.Licensee Actions Under Review (← links)
- PNO-V-85-073, on 851029,13.8 Kv Bus SO3 Feeder Breaker to 13.8 Kv Bus SO1 Tripped Open on Generation of Electrical Fault,Damaging Portion of Bus Bar.Cause Unknown.Plant Entered Cold Shutdown.Investigation Continuing (← links)
- PNO-V-85-052, on 850805 & 08,breaker Power Switches on Control Element Drive Mechanism Panels Found Closed.Two 13.8 Kv Electrical Breaker Incidents Under Licensee Review to Determine If Tampering Involved (← links)
- PNO-V-85-072, on 851024,reactor Tripped from 80% Power During Scheduled Loss of Load Test.Cause Undetermined.Util Requested Assistance from C-E to Determine Cause of Trip & Cooldown of RCS (← links)
- PNO-V-85-069, on 851003 & 08,loss of Normal Electric Power Resulted in Reactor Trip.Caused by Switchyard Electrical Distribution Malfunction.Licensee Proceeding W/Design Change to hard-wire Control for Feeder Breakers (← links)
- PNO-V-85-050, on 850726,while Preparing to Cool Down from 55-day Hot Functional Test Run,Alarm Received That Breaker Control Switch Operated W/O Authorization from Remote to Local Position.Cause Under Investigation (← links)
- PNO-V-85-059, updating PNO-V-85-058:on 850912,reactor Trip & Safety Injection Occurred.Caused by Open Atmospheric Dump Valve,Open Main Steam Line Low Point Drain Valves & Use of Auxiliary Feedwater Pump (← links)
- PNO-V-85-048, on 850724,licensee Determined That Plant Outage of Greater than 7 Days Expected to Repair Main Condenser. Caused by Damage to Two Condenser Tubes & Heater Drain Tank Inlet Shroud Due to Broken Condenser Baffle (← links)
- PNO-V-85-041, on 850708,during Preoperational Hot Functional Test,Auxiliary Spray,Atmospheric Dump & Other Valves Manipulated from Location Other than Control Room.Probably Caused by Manipulation from Remote Shutdown Panel (← links)
- PNO-V-85-043, on 850711,unidentified RCS Leakage of Approx 1.30 Gpm Discovered.Unusual Event Declared & Licensee Prepared to Shut Down Reactor.Search for Source of Leakage Continuing.Resident Inspectors Following Licensee Actions (← links)
- PNO-V-85-027, updates PNS-V-85-02 Re Arrest of Six Licensee & Contractor Employees for Offsite Drug Sales.On 850515,13 Addl Employees Suspended Pending Investigation.Course of Action Expected by 850520 (← links)
- PNO-V-89-017, on 890315,Palo Verde Unit 2 Initiated Voluntary Shutdown Due to Failures of Adv to Operate at Units 1 & 3.Unit 2 Will Remains in Mode 3 Until Advs Are Demonstrated to Be Operable (← links)
- PNO-V-88-015, on 880221,safety Injection & Containment Isolation Actuation Signals Received Due to Low Pressurizer Pressure Signal.Caused by Incorrect Bypass of Pressurizer Low Pressure Protection When Unit Entered Mode 5 (← links)
- PNO-V-93-016, on 930828,plant Restarted After Refueling Outage That Proceeded Tube Rupture Event on 930314.Cause of Tube Rupture Was Due to Intergranular Attack.Unit 3 Operating at 100% Power (← links)
- PNO-V-86-030, on 860527,all Four Channels of Reactor Coolant Low Flow Reactor Trip Protection Declared Inoperable While Unit 1 at 100% Power & Unit 2 at 10E-3% Power.Caused by Misset Rate & Step Channels of Low Flow Trip (← links)
- ML20195C188 (← links)
- ML20195C181 (← links)
- ML20199F619 (← links)
- PNO-V-86-005, on 860618,technicians Performing Initial Sys Checks of Fire Detection Sys Discovered That Internal Wiring for at Least 1 of 18 Panels Modified,Causing Damage to Internal Components (← links)
- PNO-V-90-001, on 891230,while at 12% Reactor Power W/Main Generator Sypplying Power to Grid Plants Unit 3 Phase a Main Transformer Experienced Internal Fault,Which Caused Immediate Trip of Main Generator Output Breakers (← links)
- PNO-V-87-023, on 870325,facility Granted Low Power Ol. Licensee Plans to Commence Fuel Load on 870327 (← links)
- PNO-V-86-053, on 860805,Unit 2 Turbine Tripped.On 860806,loss of Startup Transformer X03 Caused Loss of Offsite Power Train to Both Units & Resulted in Reactor Trip.Caused by Leak in Main Feed Vent Valve V249 (← links)
- PNO-V-81-029, on 810522,block Mason Employed by Marley Co, Cooling Tower Contractor,Fell Approx 40 Ft from Scaffold to Floor Inside Cooling Tower C.Worker Pronounced Dead at Scene (← links)
- PNO-V-86-025, on 860429,during Insp of multi-pin Connectors, Licensee Discovered Pin Engagement of Connectors May Be Insufficient & May Cause Open Circuit When Wires Moved.Both Trains of balance-of-plant ESF Declared Inoperable (← links)
- PNO-V-86-023, on 860426,ESF Load Sequencer for Train a Emergency Diesel Generator Inoperable.Caused by Broken Conductor in Relay Wire Discovered in Late 1985 But Mistakenly Considered Unimportant Grounding Path (← links)
- ML20203N872 (← links)
- PNO-V-86-063, on 860912,reactor Trip Occurred from Low Steam Generator Pressure When Four Channels of Steam Flow Lost. Caused by Shorting of Circuit Board.Outage Extended Past 48 H to Rebuild four-way Valve.Reactor Restarted on 860914 (← links)
- PNO-V-92-010, on 920331,plant Reactor Trip Breaker Failed to Open During Routine Surveillance Test.Licensee Has Unsuccessfully Attempted to Reproduce Failure,In Breaker Cubicle & on Test Stand in Electrical Shop (← links)
- PNO-V-86-042, on 860712,reactor Tripped from 100% Power on Low Steam Generator RCS Flow Channels a & B,Causing Turbine Generator Trip,Sys Voltage Fluctuation & Loss of Power.Cause Unknown.Plant Restored to Safe Shutdown Status (← links)
- PNO-V-86-093, on 861223,crankcase Malfunction Occurred in Train B Diesel Generator Engine.Cause Under Investigation. Fire Dept Personnel Injected Foam Into Crankcase Hole.Diesel Engine Extensively Damaged (← links)
- PNO-V-86-037, on 860701,licensee Initiated Shutdown from 30% Power Due to Increased Seal Leakage from Reactor Coolant Pump 2B.Shutdown Will Be Maintained to Replace Reactor Coolant Pump Seals.Outage Will Last 8-12 Days (← links)
- PNO-V-86-055, on 860828,reactor Trip Occurred Due to Generator/Turbine Trip.Caused by Overexcitation After Small Adjustment to Reactive Load.Vendor Contacted to Investigate Problem.Startup Schedule Pending (← links)
- ML20206M341 (← links)
- PNO-V-87-032, on 870422,small Stones in Bottom Hemispherical Head of Hot Leg Side of Steam Generator 1 Discovered.Work Activities in Steam Generators Suspended Until Primary Side of Steam Generators 1 & 2 Inspected (← links)
- PNO-V-87-039, on 870521,plant Worker Sprayed W/Reactor Coolant While Replacing Lead Shielding Around post-accident Sampling Sys.Worker Contaminated W/Radioactive Matl on Head & Shoulders.Investigation Initiated (← links)
- PNO-V-86-083, on 861119,facility Tripped on Steam Generator 1 Low Level.Caused by Failure of narrow-range Level Instruments & Steam Generator Level Oscillations.Plant Currently in Mode 3 Preparing for Restart by 861121 (← links)
- PNO-V-87-086, on 870510,reactor Shutdown Due to Inoperable Channel C 120-volt Ac Vital Inverter.Outage Tasks Will Include Surveillance Tests,Insp & Repair of Leaking Low Pressure Feedwater Heater & Equipment Problem Repairs (← links)
- PNO-V-87-007, on 870117,valid High Radiation Alarm on Steam Generator 1 Blowdown Radiation Monitor Received.Caused by Primary to Secondary Leak in Steam Generator.Cooldown in Preparation for Entry Into Steam Generator Continuing (← links)
- PNO-V-86-020, on 850418,Unit 2 Reactor Was Brought to Criticality Following Dilution of Rcs.Estimated Critical B Was 1015 Ppm W/Group 5 Control Rod Bank 75 Inches Withdrawn. Resident Inspector Witness Approach to Initial Criticality (← links)
- ML20212E764 (redirect page) (← links)
- PNO-V-86-094 (redirect page) (← links)
- PNO-V-87-058, on 870827,reactor Shutdown Commenced from 100% Power Level to Investigate Leak in Immediate Area of Valve Used in Refueling Level Monitoring.Caused by Crack in Valve. Valve Will Be Rewelded Following Weld Preparation (← links)
- ML20249A595 (← links)
- ML20249A134 (← links)
- PNO-V-87-077, on 871125,facility Issued Full Power License. Unit Currently Operating in Mode 2 at Approx 3% Reactor Power.Licensee Plans to Commence Power Ascension Testing Following Entry Into Mode 1 (← links)
- PNO-V-87-069, on 871015,licensee Informed Resident Inspectors of Findings from Ultrasonic Exams of Reactor Coolant Pump Shafts as Result of Mfg Experiences in Europe Re Crack Indicators at End of Impeller Keyway (← links)