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| Issue date | Title | Topic | |
|---|---|---|---|
| ML20134C342 | 27 January 1997 | Special Rept:On 970110,improper Stack Monitor Calibr Occurred.Caused by Use of Flawed Procedure.Revised Q-2 Surveillance Data Sheet | Grab sample |
| ML20116D985 | 24 July 1996 | 14 Day Rept:On 960710,non-conservative Setting for Safety Channel 2 High Voltage Sensing Circuit Occurred.Caused by Failures in Safety Channel 2 High Sensing Circuit.Performed Successful Check of Sensing Circuit Loss of Voltage Setting | |
| ML20116D992 | 12 July 1996 | Ro:On 960711,Safety Channel 2 High Voltage Sensing Circuit Failed.Allowed Reactor to Sit Over Weekend & Planned to Restart | |
| ML20107L748 | 25 April 1996 | Ro:On 960404,failures in Safety Channel 2 High Voltage Sensing Circuits Resulted in Safety 2 Trip.Stated Resistors Replaced & Safety Channel 2 High Voltage Power Supply Temporarily Replaced W/Exact Duplicate on 960412 | |
| ML20107L760 | 5 April 1996 | Ro:On 960404,spurious Safety Channel 2 Loss of High Voltage Trip Occurred.Caused by Previously Undetected Matl Failure. Repairs Should Be Completed by 960410 & Restart Approved Subject to Successful post-repair Checks | |
| ML20086D104 | 30 June 1995 | Ro:On 950609,failure of Primary Coolant Return Line Flow Sensor to Initiate Trip Occurred.Flow Sensors Checked After Debris Removal & as of 950626 Problem Considered Resolved | |
| ML20091L289 | 12 June 1995 | Ro:On 950609,primary Coolant Flow Line Return Sensor Failed. Caused by Debris in Line.Line Repaired | |
| ML20082D022 | 3 April 1995 | Ro:On 950309-13,leakage of Coolant HX Occurred After Primary Coolant Resistivity Increase Noted.Primary & Secondary Flow Secured & Shell Side of HX Drained.No Leakage Collected.Hx Returned to Primary Sys & Placed in Operation | Grab sample |
| ML20099H764 | 10 August 1992 | Ro:On 920727,temp Recorder Point 2 Noted to Be Reading Downscale,Indicating Failure in Circuit Monitoring Water Temp at Exit of South Ctr Fuel Box 2.Caused by Blockage in Fuel Box.Planned Maint Underway.Event Not Reportable | |
| ML20086H808 | 3 December 1991 | Final Ro:On 911119,safety Channel 2 Meter Flickered & Dropped Out Hard Downscale (Pegged).Caused by Intermitten Fault in Fine Adjust Potentiometer of Circuit. Poteniometer Replaced & Amplifier Card Reseated | |
| ML20086G263 | 27 November 1991 | Ro:Unscheduled Reactor Trip Occurred While Measuring Temp Coefficient of Reactivity.Caused by Secondary Cooling Water Dropping Below 8 Gpm Min Required by Limiting Safety Sys Setting.Cooling Water Logic Placed in City Water Mode | |
| ML20086H815 | 20 November 1991 | Ro:On 911120,unscheduled Shutdown Conducted Due to Failure of Safety Channel 2 Circuit on 911119.Possibly Caused by Problem in Safety Channel 2 Meter Circuit.Permission to Restart Not Yet Sought | |
| ML20086G268 | 19 November 1991 | Ro:Reactor Tripped on Loss of Secondary Cooling Flow on City Water & Gate Valve on City Water Flow Partially Closed to Allow Operation at Higher Temp.All Safety & Control Sys Functioned Properly.Detailed Rept Will Be Submitted | |
| ML20085H491 | 16 October 1991 | Ro:On 911003,failure to Perform Required Surveillance of Limiting Safety Sys Setting of Loss of Secondary Coolant Pump Power Discovered.Trip Check on Loss of Pump Power Incorporated Into Q-1 Quarterly Scram Checks | |
| ML20085H507 | 3 October 1991 | Ro:Possibility That Tests for Operability on Loss of Secondary Coolant Well Pump Power May Not Meet Tech Spec Surveillance Requirement 3.2.2(2) Discovered.Minutes of 911007 Executive Committee Meeting Encl | |
| ML20058F428 | 29 October 1990 | Ro:On 901002,three Reactor Startups Occurred W/O Performing Daily Checkout or Control Blade Interlock Checks Following Previous Shutdown | |
| ML20058F348 | 25 October 1990 | Ro:On 901025,three Reactor Startups Performed W/O Daily Checkout Being Performed within Required Time Interval,Per SOP SOP-A.2, Reactor Startup | |
| ML20248F108 | 29 September 1989 | Ro:On 890915 & 18,reactor Trips Occurred When Safety Channel 1 High Voltage Power Supply Dropped to 90% or Less of Rated Voltage.Caused by Instabilities in 15-volt Dc Power Supply. Trip Relays Replaced & Bistable Adjusted | |
| ML20244D598 | 31 March 1989 | Final Rept Re Higher than Expected High Streaming Radiation Levels Present at Vertical Ports During Full Power Operation.Caused by Inadequate Survey of Rabbit Shield on 870120.Extra Shielding Installed on Rabbit Sys Shield | High Radiation Area |
| ML20244A740 | 31 March 1989 | Ro:On 890317,reactor Trip W/High Primary Coolant Temp Indication Occurred.Caused by Failure of Specific Temp Recorder Sys Due to Dust/Corrosion Buildup on Slide Wire Causing Excessive Resistance.Buildup Cleaned Off | |
| ML20235W695 | 21 February 1989 | Ro:On 890221,potential Failure to Rept Significant Change in Level 1 Administration Existed,Per Tech Spec 6.6.3. Evaluation Determined No Significant Administration Oversi Oversights Involved | |
| ML20206J784 | 14 November 1988 | Ro:On 881104,unscheduled Reactor Shutdown Occurred Due to Failure of Temp Recorder to Indicate Properly.Caused by Failure of Microswitch.Microswitch & Vacuum Tube Replaced & Calibr Check Performed | |
| ML20150B682 | 23 June 1988 | Ro:On 880610,clutch Current Indication Lamp for Control Blade safety-2 Burned Out at Full Power,Dropping Control Blade from 56% Withdrawn to Fully Inserted Position.Clutch Replaced & Lamp Replacement Frequency Increased | |
| ML20196A366 | 23 June 1988 | Ro:On 880610,control Blade Safety 2 Clutch Indicating Lamp Burned Out.Burned Out Clutch Current Indicating Bulb Replaced to Include Necessary Control Blade Drive & Drop Time Checks | |
| ML20195H879 | 9 June 1988 | Final Ro:On 880409,recurrence of Safety Channel 1 Circuit to Provide Proper Power Indication Occurred After Return to Normal Operations on 880401 Following Previous Failures on 880315 & 16.Caution Memo Issued to Operators | |
| ML20151W371 | 25 April 1988 | Ro:On 880321,0401 & 09,safety Channel 1 Failed to Bottom Meter Stop.Cause Not Yet Identified.New Program Developed to Isolate & Correct Cause of Failure | |
| ML20151B368 | 28 March 1988 | Reportable Occurrence:On 880314,safety Channel 1 Circuit Failed to Provide Proper Power Indication for Several Seconds on Two Occasions.Caused by Capacitor Failure. Capacitor Replaced W/Substitute of Different Mfg | |
| ML20148E816 | 15 March 1988 | Ro:On 880315,failure of Safety Channel 1 Circuit Occurred. Failed Component Replacement Has Restored Safety Channel 1 to Normal | |
| ML20209G722 | 13 April 1987 | Ro:On 870401,reactor Experienced Safety Channel 1 Trip. Caused by Operator Error.Rapid Recovery Restart Performed by Operator.Memorandum Issued Placing Restrictions on Automatic Operation & Limiting Removal of Regulating Blade | Fuel cladding |
| ML20207J032 | 19 December 1986 | Ro:On 861211,actuation of Evacuation Alarm & Evacuation Alarm/Core Vent Sys Interlocks Occurred While Stack Count Rate Approx 300 Cps,In Potential Violation of Tech Specs. Cause Not Given.Vent Will Be Secured at 10 Cps During Drill | |
| ML20132B424 | 17 September 1985 | Ro:On 850904,one Control Blade Failed to Drop Fully Into Core on Demand from 64% Withdrawn Position.Probably Caused by Bearings Supporting Blade/Shaft Coupling or Magnesium Shroud housing-to-blade Clearance | Shutdown Margin |
| ML20132B452 | 4 September 1985 | Ro:On 850904,one Reactor Control Blade Failed to Drop on Demand from 64% Removed Position.Probably Caused by Binding in Clutch S-3 Possibly Due to Moisture or Other Effect Reducing Clearance |