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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20090E447 | 17 October 1975 | AO 50-237/75-48:on 751007,through-wall Crack Discovered in Drywell/Torus Nitrogen Purge Line 1604-18.Caused by Rapid & Uneven Contraction of Line Tee Connection Due to Liquid Nitrogen Impingement Resulting from Boiler Failure | |
| ML20090E458 | 17 December 1975 | Supplemental AO 50-237/75-44:diesel Generator Failed to Start.Caused by Air Relay Valve Failure Due to Sticking O-rings.O-rings Replaced | |
| ML20090E464 | 2 October 1975 | AO 50-237/75-44:on 750923,diesel Generator Failed to Start.Caused by Operator Failure to Follow Monthly Insp Procedure & QC Procedure for safety-related Component Replacement.Air Start Sys Inspected & Seal Ring Replaced | |
| ML20090E470 | 19 September 1975 | AO 50-237/75-43:on 750911,diesel Generator Cooling Water Pump Main Breaker Tripped.Caused by Excessive Heat Buildup within Breaker Housing.Breakers on Buses Replaced & Cover Plates Removed for Ventilation | |
| ML20090E475 | 6 November 1975 | AO 50-237/75-51:on 751031,torus Water Level Exceeded Tech Spec Limit During HPCI Sys Surveillance.Caused by Operator Failure to Verify Proper Valve Lineup.Water Pumped from Torus Until Level Dropped Below Tech Spec Limits | |
| ML20090E478 | 17 October 1975 | AO 50-237/75-49:on 751009,LPCI Loop Selection Logic Circuitry Failed to Select Preferred B Loop.Caused by Out of Calibr Differential Switch 261-34 & Electrically Shorted Switch 261-34D.Mod to Provide Signal Dampening Initiated | |
| ML20090E481 | 9 October 1975 | AO 50-237/75-45:on 750929,HPCI Turbine Failed to Trip at Designated Reactor Coolant Level.Caused by Open Circuit in Turbine Trip Solenoid Valve Coil Due to Failure of Cold Solder Joint within Coil.Hpci Trip Solenoid Valve Replaced | |
| ML20090E482 | 9 October 1975 | AO 50-237/75-46:on 750929,reactor Scrammed on High Drywell Pressure During Drywell Inerting Process.Caused by Operator Valving Error,Allowing Nitrogen Flow to Bypass Inerting Pressure Control Valve Into Drywell.Operators Cautioned | |
| ML20090E491 | 8 September 1975 | AO 50-237/75-42:on 750829,diesel Generator Cooling Water Pump Tripped,Followed by Diesel Generator Trip on High Temp. Cause Not Established.Investigation of Cooling Water Pump & Associated Breakers Continuing |