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Issue date | Title | Topic | |
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ML20004E744 | 9 June 1981 | Updated LER 81-013/03L-1:on 810415,determined Containment Isolation Valves Not Tested in Required Manner.Seven of Eight Valves Functioning as Designed.Eighth Valve Tested & Shown Operable.Test Undergoing Revision | |
ML20005A192 | 24 June 1981 | LER 81-015/03L-0:on 810525,computer Box FM-475 Found to Be Out of Acceptable Tolerances & Several Checkpoints Showed Erratic Readings During Loop a Steam Flow Channel Investigation.Caused by Two Worn Electronic Components | |
ML20009E556 | 16 July 1981 | LER 81-017/03L-0:on 810619,auxiliary Feedwater Pump a Tripped on Low Discharge Pressure.Caused by Improper Throttle Setting of Discharge Valve.Valve Repositioned | |
ML20009G018 | 22 June 1981 | LER 81-014/03L-0:on 810523,discovered That Hagan Summator PM-446B Had Shifted Nonconservatively Approx 3%.Caused by Failure of Filter Capacitor Due to Normal Wear.Faulty Capacitor Replaced | |
ML20009G118 | 10 July 1981 | LER 81-016/03L-0:on 810611,during Startup,Motor Driven Auxiliary Feedwater Pump a Tripped Due to Low Discharge Pressure While Feeding Steam Generators.Event Reoccurred on 810716.Caused by Backleakage Through Discharge Valve AFW-40 | |
ML20009H358 | 30 July 1981 | Updated LER 81-004/03L-1:on 810116,primary Coolant Sys Leak Found.Caused by Sample Cooler Tube Bundle Leakage Due to Normal Wear.Bundle Replaced.Review of Maint Records Revealed No Generic Problems | |
ML20009H610 | 31 July 1981 | LER 81-018/03L-0:on 810701,Channel I (PI-474) of a Steam Generator Steam Line Pressure Indicated High Compared to Two Redundant Channels.Caused by Throttled Root Isolation Valve MSV-14.Valve Reopened | |
ML20010B073 | 4 August 1981 | LER 81-019/03L-0:on 810705,w/unit at 95% Power,Svc Water Booster Pump (Swbp) a Motor Tripped.On 810706,SWBP a Motor Tripped Again.Caused by Normal Wear of Motor Bearings & Possible Breaker Problem,Respectively | |
ML20011A345 | 1 October 1981 | LER 81-020/03L-0:on 810902,containment Spray Check Valve SI-890B & Associated Flow Path Declared Inoperable.Caused by Failure to Perform Post Maint Testing Prior to Startup Due to Oversight.Valve Tested.Procedures Will Be Revised | |
ML20011A621 | 20 October 1981 | Updated LER 81-007/01T-1:on 810122,potential Modeling Error in ECCS Model Used for LOCA Analysis Reported.Caused by Shift in Peak Clad Temp.New ECCS Analysis Performed in Aug 1981.No Impact on Public Health & Safety | |
ML20011A731 | 19 October 1981 | Updated LER 80-014/01T-1:on 800702,vendor Info Indicated That No Certification of Qualification Was Available for PVC Electric Cable Pigtails Used on Eight Penetrations.Cable Pigtails Meet Design Specs & Accident Requirements | |
ML20023E067 | 26 May 1983 | LER 83-006/03L-0:on 830427,during Testing of Spare Pump Installed to Replace Svc Water Pump A,Pump Tripped on Overcurrent.Apparently Caused by Internal Binding of Shaft as Result of Debris in Impeller assembly.W/830526 Ltr | |
ML20023E079 | 27 May 1983 | LER 83-007/03L-0:on 830429,PORV RC-455C Failed to Meet Required Cycle Time & Failed to Open Fully on Subsequent Attempt.Caused by Galling of Valve Plug to Cage Due to Rubbing of Stainless Steel in Dry condition.W/830527 Ltr | |
ML20024B737 | 5 July 1983 | LER 83-011/03L-0:on 830605,circuit Breaker for Boron Injection Tank Heater Channel B Tripped.Caused by Component Failure Due to Normal End of Life.Failed Heater Replaced. W/830705 Ltr | |
ML20027D918 | 3 November 1982 | Updated LER 82-005/01T-1:on 820628,during Refueling Shutdown,Main Steam Check Valve B Found in Degraded Condition.Caused by Set Screws Which Lock Valve Disc tail- Piece to Rockshaft Loosened by Vibration.Set Screws Staked | |
ML20028B069 | 17 November 1982 | LER 82-017/01L-0:on 821104,w/unit at 80% Power,Operator Discovered Isolation Valve Tank Isolation Valve Closed.Cause Undetermined.Valve Locked Open & Procedures Changed to Ensure That Valve Remains Open | |
ML20028D244 | 7 January 1983 | Updated LER 80-009/01T-1:on 800414,primary to Secondary Leak of Approx 0.5 Gpm Detected in B Steam Generator,Exceeding Tech Spec Limit.Caused by Leaking Tubes.Leaks Repaired by Explosive Plugging | Eddy Current Testing |
ML20038C728 | 2 December 1981 | LER 81-025/03L-0:on 811102,emergency Diesel Generator B Failed to Start Manually.Caused by Loss of Prime in Fuel Oil Sys,Possibly Due to Debris in Ball Check Valve.Generator Returned to Svc | |
ML20038C906 | 4 December 1981 | LER 81-026/01T-0:on 811120,primary to Secondary Leak of Approx 1.5 Gpm Found in Steam Generator A.Caused by Leaking Explosive Plug.Plant Shut Down,Plug Removed & Weld Repaired on 811127 | |
ML20039D183 | 23 December 1981 | LER 81-028/03L-0:on 811125,steam Generator low-low Level Trip & Alarm Bistables BS-494-A1 & BS-494-A2 Found to Be Inoperable During Periodic Test PT-5.5 W/Unit at Cold Shutdown.Caused by Failure of Instrument Channel LI-494 | |
ML20039D328 | 23 December 1981 | LER 81-030/03L-0:on 811130,emergency Diesel Generator B Failed to Reach Rated Output Voltage Following Automatic Start Initiated by Safety Injection Signal.Caused by Faulty auto-voltage Adjust Reostat.Failure Due to Normal Wear | |
ML20039F483 | 30 December 1981 | LER 81-029/03L-0:on 811130,w/unit at Hot Shutdown,Leak Was Discovered in Chemical & Vol Control Sys.Caused by Failed bonnet-to-body Gasket on Valve CVC-291.Gasket Replaced | |
ML20039F748 | 4 January 1982 | LER 81-032/03L-0:on 811205,boric Acid Transfer Pump a Tripped & Was Declared Inoperable.Caused by Error in Valve Lineup Procedure & Open Winding in Transfer Pump Motor. Procedure Revised & Motor Replaced | Boric Acid |
ML20040B570 | 11 January 1982 | LER 81-033/01T-0:on 811228,error in Tech Spec Heatup & Cooldown Curves Found to Be Not Reported to Nrc.Caused by Administrative Reporting Failure & Errors in Calculation. Info Will Be Reported as Tech Spec Change by 820131 | |
ML20040C947 | 8 January 1982 | LER 81-034/03L-0:on 811211,loop 2 Steamline Pressure Channel Indicated Higher than Other Channels.Caused by Frozen Sensing Lines in Pressure Transmitter & Failure to Return Freeze Protection Circuit to Svc After Maint | |
ML20042A571 | 9 March 1982 | LER 82-002/03L-0:on 820207,condensate Measuring Sys Breaker HVH-1 Tripped During Periodic Testing.Caused by Reverse Rotation Due to Missing Discharge Damper Louver.Reverse Rotation Stopped.Damper Repairs Underway | |
ML20049J507 | 2 March 1982 | LER 81-033/01X-1:on 811228,error in Tech Specs Heatup & Cooldown Curves Determined to Be Reportable.Caused by Calculational Mistake & Not Revised Due to Administrative Error.Corrected Curves & Calculations Will Be Submitted | |
ML20050C291 | 25 March 1982 | Updated LER 79-034/03L-1:on 790918,motor Operated Isolation Valve AFW-V2-16A in Auxiliary Feedwater Line to Steam Generator a Failed to Open During Monthly Periodic Test. Caused by Power Supply Breaker Trip on Previous Closure |