ML20058F428
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| ML20058F428 | |
| Person / Time | |
|---|---|
| Site: | 05000083 |
| Issue date: | 10/29/1990 |
| From: | Vernetson W FLORIDA, UNIV. OF, GAINESVILLE, FL |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 9011080280 | |
| Download: ML20058F428 (3) | |
Similar Documents at 05000083 | |
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Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20134C3421997-01-27027 January 1997
[Table view]Some use of "" in your query was not closed by a matching "".Special Rept:On 970110,improper Stack Monitor Calibr Occurred.Caused by Use of Flawed Procedure.Revised Q-2 Surveillance Data Sheet ML20116D9851996-07-24024 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 ML20116D9921996-07-12012 July 1996 Ro:On 960711,Safety Channel 2 High Voltage Sensing Circuit Failed.Allowed Reactor to Sit Over Weekend & Planned to Restart ML20107L7481996-04-25025 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 ML20107L7601996-04-0505 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 ML20086D1041995-06-30030 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 ML20091L2891995-06-12012 June 1995 Ro:On 950609,primary Coolant Flow Line Return Sensor Failed. Caused by Debris in Line.Line Repaired ML20082D0221995-04-0303 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 ML20099H7641992-08-10010 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 ML20086H8081991-12-0303 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 ML20086G2631991-11-27027 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 ML20086H8151991-11-20020 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 ML20086G2681991-11-19019 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 ML20085H4911991-10-16016 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 ML20085H5071991-10-0303 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 ML20058F4281990-10-29029 October 1990 Ro:On 901002,three Reactor Startups Occurred W/O Performing Daily Checkout or Control Blade Interlock Checks Following Previous Shutdown ML20058F3481990-10-25025 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 ML20248F1081989-09-29029 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 ML20244D5981989-03-31031 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 ML20244A7401989-03-31031 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 ML20235W6951989-02-21021 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 ML20206J7841988-11-14014 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 ML20150B6821988-06-23023 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 ML20196A3661988-06-23023 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 ML20195H8791988-06-0909 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 ML20151W3711988-04-25025 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 ML20151B3681988-03-28028 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 ML20148E8161988-03-15015 March 1988 Ro:On 880315,failure of Safety Channel 1 Circuit Occurred. Failed Component Replacement Has Restored Safety Channel 1 to Normal ML20209G7221987-04-13013 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 ML20207J0321986-12-19019 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 ML20132B4241985-09-17017 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 ML20132B4521985-09-0404 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 1997-01-27 Category:TEXT-SAFETY REPORT Some use of "" in your query was not closed by a matching "". [Table view]Some use of "" in your query was not closed by a matching "". |
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