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    "query_string": "[[Category:PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO]] [[Site::Peach Bottom]]",
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	Issue date	Title	Topic
ML20151U467	18 April 1977	PNO-77-058:on 770418,following Logic Testing Small Fire of Less than 1 Minute Was Extinguished in Relay Cabinet in Cable Room Using Hand Held CO2 Extinguisher.Shutdown in Progress to Permit Replacement of Relays
ML20151U630	19 May 1977	PNO-77-086:on 770518,eight Horizontal Cracks Five to Seven Inches in Length Identified in Area Just Below CRD Nozzle on Reactor Vessel Wall.Licensee & GE Evaluating Cracks.Media Interest Not Expected & Press Release Not Planned
ML20151V001	12 May 1977	PNO-77-082:insp of CRD Return Nozzle Identified Cracks Which Appear to Be of Same Magnitude as Those Identified at Unit 3 During Earlier Outage.Licensee in Process of Grinding Out Cracks
ML20151X744	5 October 1977	PNO-77-175:licensee Reported That Reactor Cleanup Sys Leaks in Equipment Room Resulted in Release of 80,870 Mci, Predominantly Iodine,Based on 24-hour Sample Taken from 771003-04.Commonwealth of PA Notified
ML20151X778	29 July 1977	PNO-77-136:on 770729,during Daily Surveillance Testing of Insert & Retract Circuits for Neutron Detectors in SRM & IRM Channel of Nuclear Instrumentation,Evidence of Fire That Had Self Extinguished Was Discovered in Relay Cabinet
ML20155H132	8 May 1986	PNS-I-86-005:on 860506 & 07,bomb Threats Received. Nonessential Personnel Evacuated.No Device Found. Investigation Continuing
ML20198B372	9 March 1983	PNS-I-83-002:on 830308,reactor Operator Observed Small Smoldering Fire in Area Containing Sorted Radwaste Matl in Radwaste Bldg.Investigators Found Two Burned Out Cardboard Matches Stuck to One of Unburned Bags in Pile
ML20205T188	1 April 1987	PNO-I-87-26A:on 870331,order Issued Suspending Power Operation Immediately.Unit 3 Began Controlled Shutdown from 100% Reactor Power.Unit 2 Currently in Scheduled Refueling Outage W/In Progress Core Offload 2/3 Complete
ML20211E357	20 October 1986	PNS-I-86-020:on 861017,licensee Determined That Terminal Strip in Motor Control Ctr Disengaged.Preliminary Investigation by Licensee Found No Evidence of Authorized Work Performed on Sys.Investigation Continuing
ML20213D166	12 March 1980	PNO-I-80-40:on 800312,control Operator Injured While Attempting to Free Air Injector Gas Valve When Valve Opened & Caught Right Hand Between Valve Body & Position Indicator. Sustained Gash Between Thumb & Index Finger	Mission time
ML20236F300	10 June 1976	PNS-76-026:on 760610,State Police Advised Peach Bottom Station That Friends of Animals Organization from Lancaster,Pa Plans to Demonstrate Outside Plant Gate on 760703 or 04.Media Interest Expected
ML20236L505	8 February 1977	PNO-77-025:during Refueling Outage Inservice Insp Have Identified Following Pipe Cracks in Primary Coolant Boundary.Cracks Caused Delay in Scheduled Date for Plant Restart from 770223 to 770305
ML20236M087	24 January 1977	PNO-77-013:on 770124,licensee Reported That During Performance of Inservice Inspections During Current Refueling Outage,Ultrasonic Testing Revealed Crack in 12 Diameter Core Spray Pipe Line
ML20236R575	19 November 1987	PNS-I-87-019:on 871118,nonspecific Bomb Threats Received Over Plant Internal Telephone Sys.Steps to Heighten Security Awareness Among Plant & Security Supervisors Taken. Investigation Initiated by Licensee
ML20246H591	25 August 1989	PNS-I-89-012:on 890825,3 Bomb Threats Received.Vital Areas & Administration Bldg Searched.Threat Considered Hoax.Nrc & Commonwealth of PA Informed
ML20246P582	30 August 1989	PNS-I-89-014:on 890829,unusual Event Declared Due to Mischievous Vandalism of Electrical Circuit Breakers.Total of 10 Breakers Found W/Cut Leads.Region I Physical Security Inspector Dispatched to Site & Press Release Issued
ML20247D442	19 July 1989	PNS-I-89-013:on 890711,trespasser Arrested by Commonwealth of PA at Plant & While Arrested Made Ref to Large Amounts of Weapons & Explosives Stored at Residence in Edgewood,Md.Explosives & Detonators Removed from Residence
ML20247H855	25 May 1989	PNS-I-89-007:on 890525,telephone Call Received at Util Headquarters in Philadelphia,Pa Indicating That Van Loaded W/Explosives Would Arrive at Plant.Threat Evaluated as Noncredible.Heightened Security Awareness Initiated
ML20247H867	26 May 1989	PNS-I-89-007A:on 890525,two Vehicle Bomb Threats Received at Facility.Licensee Maintaining in-force Heightened Security Measures.Law Enforcement Agencies in Plant Vicinity & Commonwealth of PA Notified
ML20247N007	11 September 1989	PNS-I-89-015:revised Notification of Telephone Threat, Correcting Event Date from 890909 to 890911.Call, Originating from Limerick or Peach Bottom,Received at Corporate Ofc.On 890525,threat Received at Peach Bottom
ML20249B132	19 February 1976	PNO-76-028:on 760218,gaseous Radioactive Release Occurred for 1 H Period While Processing Spent Resin.No Personnel Overexposures & No Particulate or Halogens Released.State of PA Informed
ML20249B179	30 March 1976	PNO-76-057:on 760329,gaseous Radioactive Release Occurred for One Hour Period,While Unit Being Cooled Down for Refueling Outage.Release Occurred When Main Steam Isolation Valves Reopened to Control Pressure
ML20249B229	7 November 1977	PNS-77-044:on 771106,message Received by Telephone at Garage of Henkel & Mccoy,Contractor Working at Peach Bottom,Stated That Caller Knew of Person Planning to Place Bomb in Peach Bottom Nuclear Site
ML20249B234	15 March 1976	PNO-76-042:on 760313,while Operating at 99% Power,Increased Reactor Coolant Sys Leakage Was Noted.Reactor Was Shutdown & Drywell Entry Was Made to Investigate Leak Source.Leak Was Repaired & Reactor Returning to Power
ML20249B259	8 April 1976	PNO-76-069:on 760407,dye Penetrant Testing on 6 Feedwater Nozzles Revealed 120 Crack Indications While Shutdown for Routine Refueling Outage.Contractor,Swri,Scheduled to Perform Addl Nondestructive UT Exam of Nozzles
ML20249B272	14 April 1976	PNO-76-072:on 760413,review of Lpci/Rhr Pump Start Circuitry Conducted by Licensee,Revealed Circuit Design Error.Second Pump in Each Loop Will Not in Some Cases Automatically Start Following Loss of AC Power
ML20249B321	5 May 1976	PNO-76-082:on 760505,contractor Employee Fell 50 Feet While Riding Crane Hook in Radwaste Bldg.Employee Taken to Delta, PA by Ambulance & from There by State Police Helicopter to Hospital in Baltimore.Licensee Conducting Investigating
ML20249B379	5 April 1976	PNO-76-063:while Reactor Was in Refueling Outage on 760403,RHR Heat Exchanger Leak Occurred Which Released Reactor Water to Plant Effluent Via Heat Exchanger Cooling Water Sys.Region I Investigating Cause of Failure
PNO-I-79-040, on 791218,contractor Painter Fell from Ladder in Reactor Bldg & Sprained Ankle.Painter Was Treated & Released from Hosp.No Radiation or Contamination Involved	18 December 1979	PNO-I-79-040:on 791218,contractor Painter Fell from Ladder in Reactor Bldg & Sprained Ankle.Painter Was Treated & Released from Hosp.No Radiation or Contamination Involved	Mission time
PNO-I-82-044, on 820619,w/Unit 3 at Full Power,Hpci & Reactor Core Isolation Cooling Sys Injected Water to Core for 30 Before Safety Injection Verified Unnecessary.Caused by Degradation of Power Supply Unit	21 June 1982	PNO-I-82-044:on 820619,w/Unit 3 at Full Power,Hpci & Reactor Core Isolation Cooling Sys Injected Water to Core for 30 Before Safety Injection Verified Unnecessary.Caused by Degradation of Power Supply Unit
PNO-I-83-038A, on 830427,recirculation Loop a Riser Exam Completed.One Weld in Each of Two Risers Had Crack Indications.Data Forwarded to GE for More Detailed Analysis. Licensee Addressing Repair Method & Impact on Outage	27 April 1983	PNO-I-83-038A:on 830427,recirculation Loop a Riser Exam Completed.One Weld in Each of Two Risers Had Crack Indications.Data Forwarded to GE for More Detailed Analysis. Licensee Addressing Repair Method & Impact on Outage
PNO-I-85-048, on 850709,maint Worker Suffered First Degree Burns to Hands & Second Degree Burns to Arms & Face While Cleaning 13 Kv Transformer Disconnect Panel.Short Circuit Caused Voltage Transient.Sys Lineup Being Restored	9 July 1985	PNO-I-85-048:on 850709,maint Worker Suffered First Degree Burns to Hands & Second Degree Burns to Arms & Face While Cleaning 13 Kv Transformer Disconnect Panel.Short Circuit Caused Voltage Transient.Sys Lineup Being Restored
PNO-I-85-057, on 850812,facility Began Shutdown Due to Unusual Event.Caused by Inoperable LPCI Loop a Due to Diesel Generator E3 Out of Svc for Annual Insp & RHR-LPCI Outer Isolation Valve (MO-154A) Not Opening During Surveillance	13 August 1985	PNO-I-85-057:on 850812,facility Began Shutdown Due to Unusual Event.Caused by Inoperable LPCI Loop a Due to Diesel Generator E3 Out of Svc for Annual Insp & RHR-LPCI Outer Isolation Valve (MO-154A) Not Opening During Surveillance
PNO-I-85-060, on 850819,unit Shut Down.Caused by Diesel Generator E2 Out of Svc for Annual Insp & RHR-LPCI Outer Isolation Valve MO-154A Not Opening During Surveillance. Valve Will Be Repaired & Diesel Generator Returned to Svc	20 August 1985	PNO-I-85-060:on 850819,unit Shut Down.Caused by Diesel Generator E2 Out of Svc for Annual Insp & RHR-LPCI Outer Isolation Valve MO-154A Not Opening During Surveillance. Valve Will Be Repaired & Diesel Generator Returned to Svc
PNO-I-85-068, on 850923,chemistry Technician Determined to Be Missing & Possibly Drowned After Being Sent to Obtain Environ Water Grab Sample from Discharge Canal.Search by Util & State Police Unsuccessful	24 September 1985	PNO-I-85-068:on 850923,chemistry Technician Determined to Be Missing & Possibly Drowned After Being Sent to Obtain Environ Water Grab Sample from Discharge Canal.Search by Util & State Police Unsuccessful	Grab sample
PNO-I-85-080, on 851017,plant Tripped on Low Level Due to Loss of All Three turbine-driven Main Feed Pumps.Cause Unstated.Reactor Vessel Level Recovered by HPCI & RCIC Injection	17 October 1985	PNO-I-85-080:on 851017,plant Tripped on Low Level Due to Loss of All Three turbine-driven Main Feed Pumps.Cause Unstated.Reactor Vessel Level Recovered by HPCI & RCIC Injection
PNO-I-85-094, on 851226,reactor Scrammed on Low Reactor Water Level.Caused by Loss of Feed Pump & Fluctuations in Feedwater Level Control Sys.Condensate & Feedwater Sys Isolated.Rcic Sys Manually Started to Control Water Level	27 December 1985	PNO-I-85-094:on 851226,reactor Scrammed on Low Reactor Water Level.Caused by Loss of Feed Pump & Fluctuations in Feedwater Level Control Sys.Condensate & Feedwater Sys Isolated.Rcic Sys Manually Started to Control Water Level
PNO-I-86-008, on 860124,unit Scrammed from 95% Power After Diesel Generator E-2 Tripped When Loaded W/Certain Emergency Buses.Caused by Mechanical Failure of Scavenging Air Blower. Addl Damage Caused by Debris	27 January 1986	PNO-I-86-008:on 860124,unit Scrammed from 95% Power After Diesel Generator E-2 Tripped When Loaded W/Certain Emergency Buses.Caused by Mechanical Failure of Scavenging Air Blower. Addl Damage Caused by Debris
PNO-I-86-015, on 860216,water in Condenser Pumped to Condensate Storage Tank,Resulting in Overflow.Caused by Blown Fuse in Main Condenser Hotwell Level Control Sys.Water Drained by Yard Drain Sys & Released to River	18 February 1986	PNO-I-86-015:on 860216,water in Condenser Pumped to Condensate Storage Tank,Resulting in Overflow.Caused by Blown Fuse in Main Condenser Hotwell Level Control Sys.Water Drained by Yard Drain Sys & Released to River
PNO-I-86-019, on 860124,diesel Generator E-2 Scavenging Air Blower Failed After 21 H Continuous Operation at Low Load. Caused by Excessive Low Load Operation,As Reported by Vendor.Blower Replaced W/Higher Tolerance Blower	20 February 1986	PNO-I-86-019:on 860124,diesel Generator E-2 Scavenging Air Blower Failed After 21 H Continuous Operation at Low Load. Caused by Excessive Low Load Operation,As Reported by Vendor.Blower Replaced W/Higher Tolerance Blower
PNO-I-86-029, on 860413,explosion & Resultant Fire Occurred in Offsite Transformer.Caused by Internal Phase a Electrical Fault,Resulting in Fire & Damage to Adjacent Phase B.Plant Fire Brigade Extinguished Fire	14 April 1986	PNO-I-86-029:on 860413,explosion & Resultant Fire Occurred in Offsite Transformer.Caused by Internal Phase a Electrical Fault,Resulting in Fire & Damage to Adjacent Phase B.Plant Fire Brigade Extinguished Fire
PNO-I-86-043, on 860618,unplanned Shutdown Commenced Due to Leak in Emergency Svc Water Sys.Leak Stopped by Installing Pipe Clamp.Permanent Repairs Will Be Made Prior to Startup	18 June 1986	PNO-I-86-043:on 860618,unplanned Shutdown Commenced Due to Leak in Emergency Svc Water Sys.Leak Stopped by Installing Pipe Clamp.Permanent Repairs Will Be Made Prior to Startup
PNO-I-86-053, on 860719,scram Occurred When Reactor Pressure Spike Caused High Neutron Flux Signal.Caused by MSIV Closure During Offsite Power Trip Resulting in Loss of Emergency Power.Util Will Repair Failed Dc Coil on MSIV	21 July 1986	PNO-I-86-053:on 860719,scram Occurred When Reactor Pressure Spike Caused High Neutron Flux Signal.Caused by MSIV Closure During Offsite Power Trip Resulting in Loss of Emergency Power.Util Will Repair Failed Dc Coil on MSIV
PNO-I-86-080, on 860929,licensee Commenced Shutdown Upon Discovering Water Leakage Into Main Turbine Electrohydraulic Control Oil Sys.Return to Svc Not Expected for Approx 5 Days Following Determination of Source of Leakage	30 September 1986	PNO-I-86-080:on 860929,licensee Commenced Shutdown Upon Discovering Water Leakage Into Main Turbine Electrohydraulic Control Oil Sys.Return to Svc Not Expected for Approx 5 Days Following Determination of Source of Leakage
PNO-I-86-083, on 861015,licensee Manually Scrammed Unit & Placed in Cold Shutdown for Condensate Pump Repairs.Damaged Thrust Bearing Will Be Repaired & Pump Will Be Returned to Svc on 861019.Startup Planned on 861019	17 October 1986	PNO-I-86-083:on 861015,licensee Manually Scrammed Unit & Placed in Cold Shutdown for Condensate Pump Repairs.Damaged Thrust Bearing Will Be Repaired & Pump Will Be Returned to Svc on 861019.Startup Planned on 861019
PNO-I-87-001, on 870102,licensee Notified Region I Ofc of Unplanned Shut Down to Repair Steam Leak on High Pressure Turbine Inlet Flange.Facility Expected to Be Shut Down for Approx 4 Days	2 January 1987	PNO-I-87-001:on 870102,licensee Notified Region I Ofc of Unplanned Shut Down to Repair Steam Leak on High Pressure Turbine Inlet Flange.Facility Expected to Be Shut Down for Approx 4 Days
PNO-I-87-015, on 870304,smoke Reported in Turbine Bldg.Fire Found in Maint Cage in Turbine Bldg Fan Room.Fire Extinguished.Caused by Small Electrical Fan Suspended from Cage	5 March 1987	PNO-I-87-015:on 870304,smoke Reported in Turbine Bldg.Fire Found in Maint Cage in Turbine Bldg Fan Room.Fire Extinguished.Caused by Small Electrical Fan Suspended from Cage
PNO-I-87-018, on 870305,unit Shut Down Due to Hydrogen Leak from Main Generator.Leak Testing of Generator Identified Several Small & One Large Leak from Hydrogen Control & Analyzer Cabinet.Repairs to Generator & RHR HX in Progress	9 March 1987	PNO-I-87-018:on 870305,unit Shut Down Due to Hydrogen Leak from Main Generator.Leak Testing of Generator Identified Several Small & One Large Leak from Hydrogen Control & Analyzer Cabinet.Repairs to Generator & RHR HX in Progress
PNO-I-87-022, on 870317,hi-hi APRM Flux Scram & Group II & III Primary Containment Isolations Occurred.Caused by Electrohydraulic Control Sys Fluctuations.Unit in Cold Shutdown.Isolations Reset	18 March 1987	PNO-I-87-022:on 870317,hi-hi APRM Flux Scram & Group II & III Primary Containment Isolations Occurred.Caused by Electrohydraulic Control Sys Fluctuations.Unit in Cold Shutdown.Isolations Reset
PNO-I-87-024, on 870325,unit Auto Scrammed on Low Reactor Water Level When Engineer Lifted Electrohydraulic Control Lead Causing Bypass Valves to Open.Reactor Feed Pump Restarted.Water Level Recovered	25 March 1987	PNO-I-87-024:on 870325,unit Auto Scrammed on Low Reactor Water Level When Engineer Lifted Electrohydraulic Control Lead Causing Bypass Valves to Open.Reactor Feed Pump Restarted.Water Level Recovered

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