Semantic search
Jump to navigation
Jump to search
| Issue date | Title | Topic | |
|---|---|---|---|
| ML20084R739 | 16 January 1975 | AO 50-249/75-01:on 750104,insp of Bergen-Paterson Shock Suppressors Revealed Eight Snubbers Low on Oil W/Two Considered Inoperable.Caused by Pinched O-rings,slight Deterioration of Seals & Scratched Cylinder | |
| ML20084R768 | 6 December 1974 | AO 50-249/74-37:on 741201,during Routine Plant Insp,Pin Hole Leak Found on Min Flow Line.Caused by Erosion of Pipe from Within.Pipe Isolated & Leak Repaired Using Certified Welding Matls & Techniques | |
| ML20084R788 | 6 December 1974 | AO 50-249/74-36:on 741201,small Leak Discovered on Reactor Feed Pump 3A Min Flow Line 3-3205A.Caused by Erosion of Pipe.Leaking Pipe Isolated & Repaired by Welding | |
| ML20084R813 | 4 October 1974 | AO 50-249/74-47:on 740927,waste Collector Filter Pressure Switch Taps B Failed During Backwash Cycle.Lines B Bumped & Jarred During Maint on Unit A.Failed Lines Isolated | |
| ML20084R840 | 22 July 1974 | AO 50-249/74-37:on 740716,torus Oxygen Concentration Above 4% After 24 H.Caused by Nitrogen Supplier Failing to Meet Delivery.Vendor Notified & Util Advised That Original Order Had Been Lost | |
| ML20084R851 | 12 December 1974 | AO 50-249/74-35:on 741130,reactor Bldg Exhaust Fans 3A & B Tripped Off & Would Not Reset & Secondary Containment Blowout Panel Failed.Apparently Caused by Reactor Bldgs Becoming Overpressurized.Unit Shut Down | |
| ML20084R853 | 19 November 1974 | AO 50-249/74-34:on 741109,while Placing Offgas Recombiner 3A in Svc,Air Ejector Rupture Disc 3A Failed.Caused by Detonation of Offgas Which Occurred When Recombiner Outlet Valve 3A Was Opened.Steam Jet Air Ejectors Changed | |
| ML20084R866 | 9 October 1974 | AO 50-249/74-32:on 741003,high Pressure Coolant Injection High Flow Switch DPIS 3-2352 Found W/Setpoint Above Tech Spec Limit.Caused by Setpoint Drift.Switch Repaired & Reset | |
| ML20084R874 | 8 October 1974 | AO 50-249/74-31:on 740928,core Height Water Level Sensors Lits 3-263-73 a & B Found W/Setpoints Above Tech Spec Limit. Apparently Caused by Trapped Air Bubbles in Sensor or Not Considering Instrument Hysteresis | |
| ML20084R943 | 2 October 1974 | AO 50-249/74-29:on 740924,through-wall Crack Discovered on Torus/Drywell Purge Line.Cause Unknown.Segment Cut Out of Line Containing Crack & New Pipe Segment Welded in Place | |
| ML20084R951 | 26 September 1974 | AO 50-249/74-28:on 740920,leakage Noted in Feedwater Line Pressure Tap 3-3241-12A.Caused by Crack in Weld.Pressure Tap No Longer Used | Time of Discovery |
| ML20084R973 | 16 September 1974 | AO 50-249/74-28:on 740908,following Transversing in-core Probe (TIP) Scans,Ball Isolation Valve on TIP Machine 3E Failed to Close as Indicated by Light on Control Panel. Caused by Weak Closure Spring.Plant Mod Initiated | |
| ML20084R999 | 3 September 1974 | AO 50-249/74-27:on 740928,following Surveillance of Core Spray Sys,Core Spray 3A Discharge Header Pressure Was Lost. Caused by Discharge Stop Check Valve 3-1402-8A Failure to Seat Properly.Valve Manually Cycled | |
| ML20084S028 | 19 August 1974 | AO 50-249/74-25:on 740807,ball Isolation Valve on Transversing in-core Probe Machine B Failed to Close.Caused by Broken Wire on Solenoid Coil Actuator.Top Actuator of Valve Replaced | |
| ML20084S051 | 1 August 1974 | AO 50-249/74-23 & 24:on 740726,during Insp Prior to Local Leak Rate Testing,Rubber Coated Valve Seat for AO-3-1601-21 & 22 Found Cracked.Caused by Liquid Nitrogen Reaching Both Valves.Valve AO-3-1601-21 Replaced & 22 Blank Flanged | |
| ML20084S274 | 20 March 1973 | Telecopy Ao:On 730320,waste Surge in Grand Tanks Sampled & Activity Found to Be Above Tech Spec Limit.Caused by Pumping Waste Collector Water Directly to Surge Tank. Procedures Will Be Reviewed & Revised to Eliminate Problem | |
| ML20084S367 | 17 January 1975 | AO 50-249/74-38:on 741031,excessive Power Peaking Observed in Lower Region of Core.Caused by Xenon Transient Combined W/Very Low Fuel Exposure at Core Bottom.Control Rod Withdrawn | Power change |
| ML20084T882 | 15 June 1970 | Ao:On 700605,turbine electro-hydraulic Control Sys Transient Caused Turbine Trip & Reactor Scram,Followed by Inadvertently Opened Safety Valves.Two Safety Valves Failed to Close,Releasing Primary Coolant to Containment | |
| ML20084U014 | 2 June 1970 | Ao:On 700529,piping Restraints & Supports Damaged.Caused by Displaced HPCI Steam Line Beyond Outboard Isolation Valve. HPCI Outage Time Extension Requested | |
| ML20084U950 | 2 January 1975 | AO 50-265/74-29:on 741223,cracks at Welds in 4 Inch Reactor Recirculation Discharge Valve Bypass Lines Indicated.Cause Undetermined.Piping on a & B Loops to Be Completely Replaced | |
| ML20084U956 | 23 December 1974 | Telecopy Ao:Three Weld Abnormalities Discovered on Welds in Bypass Piping Lines Around Recirculation Pump Discharge Valves.Plans Formulated to Replace Lines | |
| ML20085G186 | 24 October 1973 | Ao:On 730925,trip Setpoint of 152 Inches for HPCI Flow Switch DPIS 3-2353 Exceeded Tech Spec Limit.Caused by Locking Device Failing to Control Setpoint Drift.Switch Setpoint Changed & Calibr Frequency Increased | |
| ML20085J815 | 2 July 1974 | Ao:On 740623,severe Vibrations Experienced on Feedwater Sys, Resulting in Damage to Feedwater Regulation Valves & Pipe Restraints.Cause Unknown.Piping Repaired.Investigation Continuing | |
| ML20085J827 | 19 June 1974 | Ao:On 740611,two Reactor High Pressure Scram Switches Found W/Setpoints Above Tech Spec Limit.Caused by Instrument Drift.Program in Progress to Precondition All Barksdale & Meletron Bourdon tube-type Switches | |
| ML20085J839 | 18 June 1974 | Ao:On 740611,during Unit Startup Small Leak Detected in Line 3-3037B Which Supplies Steam to Recombiner Booster Jet B.Caused by Defective Weld.Area Rewelded | |
| ML20085J848 | 18 June 1974 | Ao:On 740610,leak Discovered in Newly Installed Vibration Test Line Located on Reactor Feedwater Pump Discharge Header.Caused by Crack on Side of Nipple of Test Line.Unit Shut Down to Repair Leak | Hydrostatic |
| ML20085J858 | 10 June 1974 | Ao:On 740605,HPCI Valve 3-2301-3 Failed to Open.Caused by Lack of Clearance Between Auxiliary Contact Operating Bar & Main Contact Armature Roller.Air Gap Adjusted | |
| ML20085J865 | 12 June 1974 | Ao:On 740604,during Functional Test on Main Steam Line Radiation Monitor D,Trip & Alarm Did Not Function.Cause Unknown.Monitor Replaced | |
| ML20085J870 | 12 June 1974 | Ao:On 740603,during Routine Surveillance of Low Pressure Trip Switches PS2389 A,B,C & D Found W/Setpoints Above Tech Spec Limit.Caused by Lack of Precycling Prior to Installation.Switches Will Be Returned to Factory | |
| ML20085J880 | 31 May 1974 | Ao:On 740523,during Routine Monthly Surveillance 2/3 Core Height Water Level Sensor Lits 3-263-73A Found to Have Setpoint Above Tech Spec Limit.Caused by Setpoint Drift. Switch Reset | |
| ML20085J894 | 21 June 1974 | Ao:On 740522,main Steam Line Drain Valve 3-220-2 Failed to Operate Correctly.Caused by Burned Armature Windings in Valve Motor.Motor Replaced | |
| ML20085J903 | 23 May 1974 | Ao:On 740515,during Scheduled Refuel Surveillance All 16 Main Steam Line Temp Sensors Found to Operate Above Tech Spec Limit.Caused by Incorrect Calibr Technique.Corrective Action Dependent on Vendor Response to Problems | |
| ML20085J922 | 21 May 1974 | Ao:On 740515,during Local Leak Rate Testing of Msivs,Valves 1B & 2B Found W/Leak Rate Above Allowable Limit.Caused by Warped Valve Seat & Hairline Cracks in Stellate Overlay on Disc.Seating Surfaces of 2B Reinstalled | |
| ML20085J938 | 13 May 1974 | Ao:On 740506,during Local Leak Rate Testing of Feedwater Check valves,3-220-58B & 3-220-62B Revealed Leakage in Excess of Tech Spec Limit.Caused by O-ring Being Out of Groove.Ring Replaced | |
| ML20085J951 | 6 May 1974 | Ao:On 740427,after Rejection of Water Commenced,Torus Level Indication Increased.Operator Tapped on Impulse Lines of Transmitter & Indication Returned to Actual Level. Transmitter Calibr | |
| ML20085J968 | 11 June 1974 | Ao:Supplemental Info to Deviation Rept D-12-3-74-10 Re 3B Control Rod Drive Water Filter Drain Line.Normal Maint Insps & Sys Operational Tests Adequate to Prevent or Minimize Such Failures | |
| ML20085J972 | 4 April 1974 | Ao:On 740402,during Normal Plant Insp,Minor Leak Found in Control Rod Drive Water Filter 3B-302-4 Drain Line.Caused by Cracked Weld Due to Fatigue Failure.Crack Repaired | |
| ML20085J982 | 2 April 1974 | Telecopy Ao:On 740402,leakage Discovered on Control Rod Drive Water Filter 3B.Caused by Cracked Drain Line 3-4802B. Repair Procedure Initiated | |
| ML20085J986 | 3 April 1974 | Ao:On 740325,during Refueling Surveillance,Eight of 16 Area Temp Switches for HPCI Found W/High Operating Points.Cause Not Found.Calibr Kit on Order from Manufacturer | |
| ML20085K041 | 25 January 1974 | Ao:On 740116,during Electromatic Relief Valve Surveillance, Valve 3-203-3A Failed to Open.Disassembled Valve Revealed That Disc Retainer Installed | |
| ML20085K060 | 20 December 1973 | Ao:On 731212,w/reactor at Full Temp & Pressure,Mechanical Failure of Oil Line in HPCI Turbine Control Sys Rendered Turbine Operable.Caused by Full Circumferential Sheer Failure of Pipe Bushing.Bushing Replaced | |
| ML20085K070 | 25 January 1974 | Ao:On 740117,during Operability Test on Hpci,Sys Revealed to Be Inoperable.Caused by Burrs on Cylinder Wall & Piston of Turbine Stop Valve.Burrs Removed & All Parts Thoroughly Cleaned & Inspected | |
| ML20085K080 | 22 January 1974 | Ao:On 740114,during Routine Monthly Surveillance Testing, Condenser Low Vacuum Scram Switches PSL3-503A,B,C & D Actuated Below Tech Spec Setpoint.Cause Not Stated. Different Type of Switch Will Be Installed | |
| ML20085K113 | 21 December 1973 | Ao:On 731214,diesel Generator Cooling Water Pump Breaker Tripped,Following Semiannual Maint Insp.Caused by Defective Breaker.Breaker Replaced | |
| ML20085K129 | 6 December 1973 | Ao:On 731127,cleanup Valve MO-3-1201-2 Failed to Isolate on Reactor Low Water Level Scram.Caused by Tarnished M Coil in Breaker Auxiliary Contacts.Contacts Cleaned | |
| ML20085K151 | 20 November 1973 | Ao:On 731112,steam Flow Switches 3-2352 & 3-2353 for HPCI Sys Found Out of Calibr.Caused by Setpoint Drift.Switches Reset | |
| ML20085K191 | 19 November 1973 | Ao:On 731109,during Routine Monthly surveillance,2/3 Core Height Water Level Sensors LITS-263-73A & B Found to Have Setpoints Above Tech Spec.Caused by Setpoint Drift.Switches Reset | |
| ML20085L653 | 9 August 1971 | Telecopy Ao:On 710805,scram Relay 590-108A Failed to Drop Out When Deenergized.Cause Unknown.Closure Operation Repeated W/Relays Under Observation W/O Recurrence of Incident.Relays Exercized & Normally Operated | |
| ML20085L798 | 5 August 1971 | Telecopy Ao:On 710805,scram Relay 590-108A Failed to Drop Out When Deenergized.Cause Unknown.Closure Operation Repeated W/Relays Under Observation & Incident Did Not Occur.All Relays Exercized & Operate Normally | |
| ML20090E432 | 20 November 1975 | AO 50-237/75-52:on 751116,MSIV AO 2-203-1C Closing Time Found Below Tech Spec Section 3.7.D.1.Caused by Out of Adjustment Hydraulic Bleedoff Valve.Bleedoff Valve Readjusted |