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| Issue date | Title | Topic | |
|---|---|---|---|
| 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 | |
| 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 | |
| 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 | |
| ML20086F724 | 20 January 1975 | Telecopy Ao:On 750120,level Comparator LC-460A Failed to Operate.Cause Not Stated | |
| 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 |
| 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 |
| ML20087B281 | 24 November 1971 | Telecopy Ao:On 711124,leak Occurred in Pressurizer Liquid Space Sample Hx.Activity Increase in Component Cooling Sys Minimial | |
| ML20087B282 | 20 November 1972 | Ao:On 721027,containment Vessel Personnel Hatch Inner Door Malfunctioned.Caused by Failure of Cam Track Bearing in Inner Door Mechanism,Preventing Closure of Door.New Cam Track Bearing Installed | |
| ML20087B311 | 25 October 1971 | Telecopy Ao:On 711025,radiation Monitor on Steam Generator Blowdown Alarmed,Indicating Primary to Secondary Leak of 1 Gallon Per H in Steam Generator A.Chemist from Westinghouse Will Evaluate Leak on 711026 | |
| ML20087B846 | 19 June 1971 | Ao:Leak Detected in Steam Generator.Caused by Cracking of Tube Seal Welds at Tube Sheet Due to Separation of Cladding | Boric Acid |
| 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 |
| 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-75-1158, 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 | |
| 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-75-1575, 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 | |
| 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 | |
| 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-75-2017, 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-75-2210, 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 | |
| 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 |