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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20084S912 | 25 March 1977 | Telecopy Ao:On 770324,containmet Spray Pump a Out of Svc During Training Startup,Violating Tech Spec | |
| ML20084S909 | 31 May 1976 | Ao:On 770527,HPCI Pressure Switches E41-PSH-NO12 A,B,C & D Exceeded Tech Spec Calibr Limits.Switches Immediately Recalibr | |
| ML20086D421 | 9 February 1976 | AO 50-261/76-3:on 760128,high Level Alarm Received on Safety Injection Accumulator B.Caused by Check Valve 875 Leaking Resulting in Dilution.Accumulator Partially Drained & Refilled | |
| ML20086D442 | 2 February 1976 | AO 50-261/76-2:on 760121 & 22,failure of One & Delayed Operation of Two Reactor Trip Relays Occurred.Caused by Open Coil Winding.Three Defective Relays Replaced | |
| ML20086D427 | 29 January 1976 | Telecopy Ao:On 760128,sample of Safety Injection Accumulator B Indicated Boron Concentration of 1,939 Ppm,Below Tech Specs.Accumulator Partially Drained,Refilled & Verified | |
| ML20086D439 | 22 January 1976 | Ao:On 760124 & 22,discovered That Reactor Trip Relay RT3 in Reactor Protection Logic Train a Operating Erratically. Further Investigation Revealed That Relays RT-4 & RT-8 on Logic Train B Defective.Relays Replaced | |
| ML20086D447 | 13 January 1976 | AO 50-261/76-1:on 760102,failure of Boric Acid Transfer Pump Resulted in Failure of One ESF Component That Caused or Threatened to Render Sys Incapable of Functioning.Caused by Damaged Rotor | Boric Acid |
| ML20086F521 | 2 January 1976 | Ao:On 760102,boric Acid Pump B Stopped Running.Caused by Defective Stator & Damaged Rear Bearing.Investigation Continuing | Boric Acid |
| NG-75-2222, AO 50-261/75-20:on 751210,channel 950 of Containment Pressure Protection Found Inoperable.Caused by Open Output Fuse in Comparator PC-950.Fuse Replaced | 23 December 1975 | AO 50-261/75-20:on 751210,channel 950 of Containment Pressure Protection Found Inoperable.Caused by Open Output Fuse in Comparator PC-950.Fuse Replaced | |
| NG-75-2210, AO 50-261/75-19:on 751208,boron Concentration Found Below Limits in Safety Injection Accumulator B.Cause Not Stated. Accumulator Partially Drained & Refilled from Refueling Water Storage Tank | 22 December 1975 | AO 50-261/75-19:on 751208,boron Concentration Found Below Limits in Safety Injection Accumulator B.Cause Not Stated. Accumulator Partially Drained & Refilled from Refueling Water Storage Tank | |
| ML20086F516 | 8 December 1975 | Ao:On 751208,boron Sample from Safety Injection Accumulator B Indicated 1,915 ppm,35 Ppm Below Tech Specs.Cause Unknown. Accumulator Partially Drained & Refilled from Refueling Water Storage Tank | |
| NG-75-2017, AO 50-261/75-18:on 751102,auxiliary Feedwater Pump a Failed to Start Following Safety Injection Signal.Caused by Tarnished Contacts.Contacts within Local/Remote Switch Cleaned.Further Investigation Underway | 13 November 1975 | AO 50-261/75-18:on 751102,auxiliary Feedwater Pump a Failed to Start Following Safety Injection Signal.Caused by Tarnished Contacts.Contacts within Local/Remote Switch Cleaned.Further Investigation Underway | |
| NG-75-2010, AO 50-261/75-17:on 751101,both Containment Personnel Air Lock Doors Opened Simultaneously W/Rcs Temp Above 200 F, Violating Tech Spec 3.6.1.a.Caused by Broken Rod,Bearing & Cam Follower on Outer Door Mechanism | 12 November 1975 | AO 50-261/75-17:on 751101,both Containment Personnel Air Lock Doors Opened Simultaneously W/Rcs Temp Above 200 F, Violating Tech Spec 3.6.1.a.Caused by Broken Rod,Bearing & Cam Follower on Outer Door Mechanism | |
| NG-75-2001, AO 50-261/75-16:on 751028,svc Water Booster Pump B Failed to Start.Caused by Actuation of Pump Suction Pressure Switches Provided to Protect Pumps from Low Npsh.Containment Recirculation Fans Stopped to Prevent Overheating Motors | 11 November 1975 | AO 50-261/75-16:on 751028,svc Water Booster Pump B Failed to Start.Caused by Actuation of Pump Suction Pressure Switches Provided to Protect Pumps from Low Npsh.Containment Recirculation Fans Stopped to Prevent Overheating Motors | |
| ML20086F529 | 4 November 1975 | Ao:On 751102,motor Driven Auxiliary Feedwater Pump a Failed to Start.Remote Electrical Contacts Cleaned | |
| ML20086F540 | 3 November 1975 | Ao:On 751101,containment Integrity Broken for Approx 10 Minutes Due to Simultaneous Opening of Both Personnel Air Lock Doors | |
| ML20086F549 | 29 October 1975 | Ao:On 751028,sequence of Switch Operations Resulted in Breakers for Both Svc Water Booster Pumps a & B Tripping on Overload | |
| NG-75-1575, AO 50-261/75-15:on 750921,more than One Inoperable Rod Present W/Reactor at Power as Result of Rod Control Urgent Failure.Caused by Defective Fuse in Ac Power Supply to Rod Control Cabinet 1AC.Fuse Replaced | 1 October 1975 | AO 50-261/75-15:on 750921,more than One Inoperable Rod Present W/Reactor at Power as Result of Rod Control Urgent Failure.Caused by Defective Fuse in Ac Power Supply to Rod Control Cabinet 1AC.Fuse Replaced | |
| ML20086F561 | 22 September 1975 | Ao:On 750921,urgent Failure Alarm Received.Caused by Phase Failure in Cabinet 1AC Which Rendered 12 Rods Inoperable. Reactor Manually Tripped | |
| NG-75-1212, Revised AO 50-261/75-11:on 750527,RCS Oxygen Concentration Found to Be 0.16 Ppm,Exceeding Limit.Caused by Inattention to Hydrogen Concentration & Dilution of RCS to Hot Shutdown Boron Concentration.Vol Control Tank Vented | 4 August 1975 | Revised AO 50-261/75-11:on 750527,RCS Oxygen Concentration Found to Be 0.16 Ppm,Exceeding Limit.Caused by Inattention to Hydrogen Concentration & Dilution of RCS to Hot Shutdown Boron Concentration.Vol Control Tank Vented | |
| NG-75-1158, AO 50-261/75-14:on 750715,valve V2-14B Steam Driven Auxiliary Feedwater Pump Discharge to Steam Generator B Failed to Open.Caused by Belleville Spring Being Filled W/Grease.Belleville Spring Packs & Shafts to Be Inspected | 25 July 1975 | AO 50-261/75-14:on 750715,valve V2-14B Steam Driven Auxiliary Feedwater Pump Discharge to Steam Generator B Failed to Open.Caused by Belleville Spring Being Filled W/Grease.Belleville Spring Packs & Shafts to Be Inspected | |
| ML20086F596 | 16 July 1975 | Telecopy Ao:On 750715,steam Drive Auxiliary Feedwater Pump Discharge Valve V2-14B to Steam Generator B Failed to Open Electrically | |
| ML20086F615 | 14 July 1975 | Ao:On 750711,control Rod L-5 Dropped,Causing Load Runback to Approx 70% Power.Caused by Defective Stationary Gripper Coil | |
| NG-75-1089, Revised AO 50-261/75-8:on 750429,RHR Suction Valve RHR-862A Failed.Caused by Torque Switch on Motor Operator Being Out of Adjustment,Causing Valve to Be Wedged Onto Seat & Preventing Motor from Opening Valve | 11 July 1975 | Revised AO 50-261/75-8:on 750429,RHR Suction Valve RHR-862A Failed.Caused by Torque Switch on Motor Operator Being Out of Adjustment,Causing Valve to Be Wedged Onto Seat & Preventing Motor from Opening Valve | |
| NG-75-1044, AO 50-261/75-12:on 750625,boric Acid Transfer Pump a Failed. Caused by Pump Shaft Being Broken at Keyway.Pump Rebuilt & Reinstalled.New Pump Model GVH-10K Will Be Installed Upon Receipt | 10 July 1975 | AO 50-261/75-12:on 750625,boric Acid Transfer Pump a Failed. Caused by Pump Shaft Being Broken at Keyway.Pump Rebuilt & Reinstalled.New Pump Model GVH-10K Will Be Installed Upon Receipt | Boric Acid |
| ML20086F608 | 26 June 1975 | Telecopy Ao:On 750625,boric Acid Transfer Pump a Noted Off. Caused by Pump Shaft Being Broken at Keyway.Also on 750625, Employee Received Whole Body Dose of 3,080 Mrem for Quarter Ending 750630 | Boric Acid |
| ML20086F674 | 12 June 1975 | Revised AO 50-261/75-9:on 750501,reactor Coolant Pump Seal Failed,Resulting in Discharge of Reactor Coolant Fluid to Containment Floor.Caused by Pump Running W/Seal Leaking. Seals,Shaft,Impeller & Hearings Replaced | |
| ML20086F620 | 6 June 1975 | AO 50-261/75-11:on 750527,RCS Oxygen Concentration Noted to Be 0.16 Ppm,Exceeding Limit.Caused by Mixture of Hydrogen & Nitrogen in Vol Control Tank,Limiting Hydrogen to Rcs.Vol Control Tank Vented | |
| ML20086F627 | 2 June 1975 | AO 50-261/75-10:on 750521,boric Acid Transfer Pump B Failed.Caused by Shaft Being Broken at Keyway & Worn Pump Bearing.Pump Rebuilt | Boric Acid |
| ML20086F623 | 27 May 1975 | Ao:On 750527,RCS Sample Indicated 0.16 Ppm Oxygen,Exceeding Tech Specs.No Cause Stated.Concentration Reduced | |
| ML20086F630 | 21 May 1975 | Ao:On 750521,boric Acid Pump B Stopped.Caused by Broken Shaft in Keyway Area | Boric Acid |
| ML20086F579 | 12 May 1975 | AO 50-261/75-9:on 750501,reactor Coolant Pump Seal Failed, Resulting in Discharge of Reactor Coolant Fluid to Containment Floor.New Seal & Associated Parts Being Installed.Parts Shall Be Certified | |
| ML20086F644 | 9 May 1975 | AO 50-261/75-8:on 750429,RHR Pump Suction Valve RHR-862A Failed.Caused by Torque Switch on SMB-O Motor Operator Being Out of Adjustment.Torque Switch Adjusted.On 750430,complete Insp of Operator Found Excess Grease.Grease Removed | |
| ML20086F691 | 2 May 1975 | Telecopy Ao:On 750501,seal 1 on Reactor Coolant Pump C Failed,Producing Leak to Containment Floor.Seal 2 Failed on 750502.Cooldown Initiated.Rcs Depressurized & Drained to Below Pump Seals | |
| ML20086F647 | 29 April 1975 | Ao:On 750429,valve RHR-862A Failed to Open from RTGB When RHR Sys Being Aligned.Cause Under Investigation.Valve Opened Locally Using Manual Operator & All Flow Paths Restored | |
| ML20086F698 | 10 April 1975 | AO 50-261/75-7:on 750331,diesel B Tripped Due to Low Lube Oil Pressure.Caused by Lube Oil Filter High Differential Pressure Resulting from Dirty Filters.Lube Oil Filters Replaced | |
| ML20086F696 | 1 April 1975 | Telecopy Ao:On 750331,emergency Diesel B Tripped.Caused by Low Lube Oil Pressure.Filters Changed & Unit Returned to Svc | |
| ML20086F699 | 27 March 1975 | AO 50-261/75-6:on 750314,contractor Personnel Exposed to Radiation in Excess of Limits.Caused by Exceeding Stay Time in Localized Field of High radiation.Chem-Nuclear,Inc & Util Investigating Use of Addl Shielding | High Radiation Area |
| ML20086F700 | 7 March 1975 | AO 50-261/75-5:on 750225 & 26,boric Acid Transfer Pump B Failed.Cause Not Identified.Pump Replaced | Boric Acid |
| ML20086F701 | 14 February 1975 | AO 50-261/75-4:on 750206,reactor Protection Overpower Channel Set I Failed to Generate Rod Stop Signal for Simulated Overpower Condition.Caused by Failure of Comparator Circuit in Dual Circuit Signal Comparator | |
| ML20086F705 | 7 February 1975 | Ao:On 750206,signal Comparator TO-412B Failed to Operate. Portion of Comparator Which Generates Rod Stop & Turbine Runback Signal Failed While Overpower Reactor Trip Signal Still Generated | |
| ML20086F711 | 6 February 1975 | AO 50-261/75-3:on 750126,component Cooling Water Pump C Tripped Due to Overcurrent.Caused by Backleakage Through Pump Discharge Side Check Valve Due to Debris.Leaking Mechanical Seal & Status Light Module Replaced | |
| ML20086F720 | 30 January 1975 | AO 50-261/75-2:on 750120,pressurizer Level Channel II Failed to Generate Reactor Trip Signal or Safety Injection Signal Upon Insertion of Simulated High & Low Levels.Caused by Malfunctioning Filter Capacitor C.3 | |
| ML20086F728 | 27 January 1975 | AO 50-261/75-1:on 750114,boric Acid Transfer Pump a Failed. Caused by Failed Shaft in Vicinity of Impeller Keyway.Pump Replaced.Replacement Pump Model GVH-10K on Order | Boric Acid |
| ML20086F714 | 27 January 1975 | Telecopy Ao:On 750126,component Cooling Pump C Failed to Start from Rtgb.Cause Under Investigation.Pump Breaker Racked Out,Inspected & Racked in | |
| ML20086F724 | 20 January 1975 | Telecopy Ao:On 750120,level Comparator LC-460A Failed to Operate.Cause Not Stated | |
| ML20086F735 | 15 January 1975 | Ao:On 750114,boric Acid Transfer Pump a Noted to Be in Off Indication at Rtgb.Caused by Broken Shaft | Boric Acid |
| ML20085D062 | 17 July 1973 | Ao:On 730628-0705 & 09-10,changes Performed on Safeguards Equipment W/O Demonstrating Operability of Redundant Equipment Before Removal.Safety Injection Pumps B & C Tripped & Circuit Breaker Tripped,Respectively | |
| ML20085D066 | 11 July 1973 | Telecopy Ao:On 730709,two Safety Injection Pumps Experienced Overcurrent Trips.Caused by New Overcurrent Trip Devices Tripping at Lower than Desired Value.Trip Setting Increased | |
| ML20085D077 | 10 July 1973 | Telecopy Ao:On 730710,circuit Breaker for Containment Cooler Fan 2 Tripped.Caused by Overcurrent Due to Misalignment of Calibr Spring in Overcurrent Trip Device.Spring Realigned |