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Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20211B1671999-07-13013 July 1999
Special Rept on 990614 Re Test of Scram Set Point of Two of Five Low Primary Coolant Flow Safety Sys Channels.Caused by Trip Set Points Being Too Close to TS Limits.Compliance Procedure 23 Will Be Revised
ML20236Y5941998-08-0606 August 1998
Special Rept:On 980706,operator Noted That One Sample Listed as Inches Long on Loading Sheet,Only 2 Inches Long.Errors Constitute Observed Inadequacy in Implementation of Administrative & Procedural Control.Procedures Revised
ML20236S1711998-07-15015 July 1998
Ro:On 980615,large & Rapid down-shift on Three Different Meter Indications from One Ni Drawer Was Discovered.Caused by Failed Preamplifier in Wide Range Amplifier Subject Ni Drawer.Replaced Cabling,Detector & Preamplifier
ML20198K9441998-01-0808 January 1998
Special Rept:On 971209,reactor Shutdown by High Power Scram Initiated by Wide Range Monitor of Nuclear Instrument Sys. Caused by Unanticipated Positive Reactivity Insertion. Reflector Sample Opened & Inspected
ML20197D2751997-12-15015 December 1997
Ro:On 971026 & 1106,slight Elevation of Fission Products Were Detected in Primary Coolant Water Analyses.Caused by Slight Fabrication Flaw in Element MO-460.Surveillance of Bwx Technologies Fabrication Techniques Will Be Increased
ML20196G8891997-07-15015 July 1997
Special Rept:On 970616,scram Setpoint for Low Flow Scram for Heat Exchanger 503A Leg Was 25 Gpm Below TS Limit.Caused by Drifting of Setpoint of Vutronik Monitor Switch DPS-928A. Adjusted Trip Setting & Retested Trip Setting
ML20116E2621996-07-30030 July 1996
Ro:On 960701,emergency Generator Shutdown on High Coolant Temp.Caused by Sheared Water Pump Shaft.Replaced Defective Pump
ML20100J3991996-02-22022 February 1996
Ro:On 960123,reactor Was Shut Down by Manual Scram When Console Operator Determined That Regulating Blade Was Inoperable.Caused by Seized Bearing on Gearbox Input Shaft. Bearing Replaced
ML20097J4391996-01-26026 January 1996
Special Rept:On 951227,reactor Shutdown Occurred Due to Reactor in Operation W/Regulating Blade in Degraded Condition.Replaced Dowel Pin
ML20082P4491995-04-19019 April 1995
Special Rept:On 950320,reactor Startup Occurred W/Source Range Monitor in Degraded Condition.Shutdown Taken by Console Operator
ML20073K3221994-09-30030 September 1994
Special Rept:On 940902,reactor Scram Occurred Due to Failure of Inner Airlock Door Drive Sys.Airlock Door Drive Sys Repaired
ML20069E0241994-05-25025 May 1994
Special Rept:On 940426,shift Supervisor Noted Decreasing Power Trend on Wide Range Monitor Chart.Problem Quickly Identified to Be One Loose & One Missing Set Screw in Motor to Gearbox Coupling.Missing Set Replaced W/New One
ML20058M7421993-09-27027 September 1993
Ro:On 930907,determined That Scram Setpoint for Low Flow Scram for HX 503B Leg Below LSSS of 1625 Gpm Required by TS 2.2.Caused by Defective Alarm Trip Unit.Defective Alarm Trip Unit Replaced W/Spare Unit
ML20056D8771993-08-12012 August 1993
Ro:On 930712-26,reactor Operated W/Operability of Automatically Closing Reactor Containment Isolation Door in Degraded Condition.Caused by Actuating Cam Maladjusted.Cam Readjusted & Tightened
ML20125B6951992-12-0202 December 1992
Ro:On 921104,channel 4,5 or 6 95% Downscale Annunicator Received,Annunicator Locked in & Then Cleared Several Times. Caused by Setscrew,That Engages Motor Shaft to Gear Box, Coming Loose.Motor Shaft Modified to Add Flat Surface
ML20099A7051992-07-20020 July 1992
Special Rept:From 920622-23,reactor Operated W/Unreliable Radiation Monitoring of Exhaust Stack Effluent.Caused by Pieces of Sheet Metal,Used as Bending Vanes,Breaking Loose & Disconnecting from Sampling Line.Probe Reconnected
ML20099B6231992-07-20020 July 1992
Special Rept:On 920623,discovered Lower than Normal Chart Recorder Indication on Stack Radiation Monitor Gas Channel. Caused by Pieces of Sheet Metal Impacting Kinetic Probe. Tygon Tubing Connection Replaced W/Solid Tubing
ML20086N1101991-12-10010 December 1991
Special Rept:On 911111,differential Pressure Indications Showed That One of Two Primary Coolant Isolation Valves Did Not Seat Properly.Caused by Valve Steam Falling Out of Valve Actuator.Actuator Key Replaced & Bottom Slot Recrimped
ML20079L7191991-10-29029 October 1991
Ro:On 910930,primary Coolant Isolation Valve V507A Took Longer than Normal to Close & Differential Pressure Indications Indicated Valve Failed to Seat Properly.Caused by Valve Stem Binding.Valve Will Be Replaced
ML20246A1031989-06-15015 June 1989
Ro:On 890603,discovered That Drive Chain Had Fallen Off Drive Gear for Regulating Blade Rotary Limit Switch.Reactor Shutdown Initiated.Chain for Rotary Limit Switch Assembly Returned to Drive Gear & Tension Adjusted
ML20248G6241989-03-28028 March 1989
Ro:On 890302,reactor Operated for 2 H & 33 Minutes W/ Emergency Generator Local Switch in Stop Position.Caused by Personnel Error.Subj Local Switch Placed in Remote Position. Operator Involved Counseled.Checksheet Revised
ML20206B9931988-10-31031 October 1988
Revised 881019 Special Rept on 880921 Event Re Reactor Operation W/Regulating Blade Being Inoperable.Second Sentence in Ltr Corrected
ML20195D4911988-10-28028 October 1988
Ro:On 880929,difference of 10 F Between Temp Indications for Primary Loop a & Loop B Observed.Caused by Small Amounts of Resistance Introduced Into Compensation Loop Leads. Connection for Compensation Loop Will Be Double Checked
ML20205N8811988-10-28028 October 1988
Ro:On 880929,Tech Spec Deviation Occurred Due to Intermediate Range Monitor Channel 3 Indicating Downscale & Associated Short Period Rod run-in & Scram Trip Inoperable. Caused by Breakdown of Cable Insulation.Cabling Replaced
ML20205H8961988-10-19019 October 1988
Ro:On 880921,Channel 4 High Power Rod run-in Occurred & Regulating Blade Would Not Respond in Either Automatic or Manual Mode.Caused by Gear Box Assembly W/Internal Drive Gear Ridden Up Shaft Due to Loose Set Screw.Drive Repaired
ML20154L3981988-09-15015 September 1988
Ro:On 880818,emergency Generator Cranking Limit Indication Found Tripped & Plant Failed to Start Lamp Energized. Caused by Linkage Lubrication Problem.Preventive Maint (PM) Procedure Added to PM Schedule
ML20235G4991987-09-24024 September 1987
Ro:On 870825,closed Indicating Light for Automatically Closing Reactor Containment Isolation Door Did Not Turn On. Caused by Addl Drag Reducing Coast Distance of Door.Motor Drive Stop Microswitch Readjusted
ML20206D0031987-03-31031 March 1987
Ro:On 870305,test Signal Simulating High Temp Fed to 980A Meter Relay Trip Unit,But Meter Relay Contacts Failed to Open.Caused by Decreased Capacitance Value in Meter Relay Control Circuit.Meter Relay Trip Unit Replaced
ML20214N8381986-11-24024 November 1986
Ro:On 861030-31,reactor Operated W/Seal for Inner Airlock Door Deflated Due to Bleed Valve in Abnormal Position.Caused by Personnel Error.Procedures Will Be Revised & Addl Pressure Gauge Will Be Added to Air Supply Sys
ML20214P2841986-09-10010 September 1986
Ro:On 860815,emergency Pool Fill Sys Discovered in Abnormal Lineup Due to Valve PIV-1 Being Closed.Caused by Improper Clearing of Red Tag Indicating Valve Opened on 860501. Reactor Startup Checksheet Revised to Ensure Valve Opened
ML20211K3891986-08-20020 August 1986
Ro:On 860729,dosimeter Vendor,Rs Landauer & Co,Reported That TLD Finger Dosimeter Recorded 23,560 Mrem for June 1986.On 860609,employee Packed Tm-170 Wafers for Shipment.Committee to Investigate Exposure Activated
ML20134E2881985-08-13013 August 1985
Ro:On 850718,during Front Panel Checks Prior to Reactor Startup,Rod run-in Trip Function for Power Range Monitor 5 Found Inoperable.Possibly Caused by Loose Pin Connection. Trip Unit Module Replaced & Operability Checked Weekly
ML20126J4661985-05-31031 May 1985
Ro:On 850519,chain Link on Drive Chain for Regulating Blade Position Indicator Failed.Caused by Broken Drive Chain Link. Drive Chain Link Repaired & Regulating Blade Driven Full in for Position Indication Reset
ML20112E1321985-03-18018 March 1985
Ro:On 850220,nuclear Instrumentation Channel 6 Power Range Monitor Indication Dropped from Indicated Power of 104% to 92%.Cause Not Determined.Down Scale Alarm of 75% Will Be Changed to 95%
ML20112F0111985-01-11011 January 1985
Ro:On 841213,emergency Generator Stalled 45 After Assuming Emergency Electrical Loads During Emergency Generator Load Test CP-17.Cause Not Found.Stalling Did Not Recur During Subsequent Tests.Mods Will Reduce Starting Load
ML20091Q9251984-06-0808 June 1984
Ro:On 840511,personnel Airlock Doors Operated Out of Sequence,Allowing Both Inner & Outer Doors to Open at Same Time.Caused by Outer Airlock Door Gasket Pulled Partly from Seat.Gasket Replaced
ML20079K7491984-01-13013 January 1984
Ro:On 831215,emergency Generator Gasoline Engine Electrical Interlock Protective Circuit Tripped.Caused by Bent & Nearly Grounded Electrical Connecting Wire Spade Lug.Trip Sensor Leads Placed to Prevent Grounding
ML20081J0821983-11-0101 November 1983
Ro:On 831003,during Full Power,Site Electrical Power Lost & Emergency Generator Operated in Degraded State.Cause Probably Due to Addition of STP Gas Treatment on 830923. Gas Pumped from Generator Tank.Sys Refilled
ML20066H9661982-11-17017 November 1982
Ro:During 821021 Shutdown to Change Flux Trap Samples,Flux Trap Sample Hold Down Device Determined Improperly Installed During 821018 Shutdown.Caused by Hold Down Rod Assembly Pinned High.Device Properly Repinned
ML20054F6981982-05-25025 May 1982
Ro:Advises of Mod to Corrective Action Noted in Informing NRC of Valve Left Open in Line That Penetrates Containment Wall.Red Danger Tags on Valves Outside Containment Removed,As Pipe Cap Insures Flow Path Isolated
ML20062C0151978-10-31031 October 1978
Ro:On 781022,control Blade B Unexpectedly Dropped from Drive Magnet & Hung Up Approx 7 Inches Above Full Insertion. Probably Caused by Broken Outer Race of One of Eight Vertical Guide Bearings
1999-07-13
[Table view]
Category:TEXT-SAFETY REPORT
MONTHYEARML20212D4471999-09-20020 September 1999
Safety Evaluation Supporting Amend 31 to License R-103
ML20211B1671999-07-13013 July 1999
Special Rept on 990614 Re Test of Scram Set Point of Two of Five Low Primary Coolant Flow Safety Sys Channels.Caused by Trip Set Points Being Too Close to TS Limits.Compliance Procedure 23 Will Be Revised
ML20206A9681999-04-21021 April 1999
Revised Page 4 to MURR QA Plan
ML20202G9051998-12-31031 December 1998
Operations Monthly Summary for Univ of Mo Research Reactor for Dec 1998
ML20207A6981998-12-31031 December 1998
Reactor Operations Annual Rept for 980101-1231, for Univ of Missouri Research Reactor Facility.With
ML20202G9171998-11-30030 November 1998
Operations Monthly Summary for Univ of Mo Research Reactor for Nov 1998
ML20202G9271998-10-31031 October 1998
Operations Monthly Summary for Univ of Mo Research Reactor for Oct 1998
ML20154M3301998-09-30030 September 1998
Monthly Operating Rept for Sept 1998 for Univ of Missouri Research Reactor
ML20154M3401998-08-31031 August 1998
Monthly Operating Rept for Aug 1998 for Univ of Missouri Research Reactor
ML20236Y5941998-08-0606 August 1998
Special Rept:On 980706,operator Noted That One Sample Listed as Inches Long on Loading Sheet,Only 2 Inches Long.Errors Constitute Observed Inadequacy in Implementation of Administrative & Procedural Control.Procedures Revised
ML20154M3431998-07-31031 July 1998
Monthly Operating Rept for Jul 1998 for Univ of Missouri Research Reactor
ML20236S1711998-07-15015 July 1998
Ro:On 980615,large & Rapid down-shift on Three Different Meter Indications from One Ni Drawer Was Discovered.Caused by Failed Preamplifier in Wide Range Amplifier Subject Ni Drawer.Replaced Cabling,Detector & Preamplifier
ML20154M3651998-06-30030 June 1998
Monthly Operating Rept for June 1998 for Univ of Missouri Research Reactor
ML20154M3731998-05-31031 May 1998
Monthly Operating Rept for May 1998 for Univ of Missouri Research Reactor
ML20154M3841998-04-30030 April 1998
Monthly Operating Rept for Apr 1998 for Univ of Missouri Research Reactor
ML20246P9931998-03-31031 March 1998
Monthly Operating Rept Summary for Mar 1998 for Univ of Missouri Research Reactor
ML20246Q0231998-02-28028 February 1998
Monthly Operating Rept Summary for Feb 1998 for Univ of Missouri Research Reactor
ML20203H4271998-02-26026 February 1998
Safety Evaluation Supporting Amend 30 to License R-103
ML20246Q0201998-01-31031 January 1998
Monthly Operating Rept Summary for Jan 1998 for Univ of Missouri Research Reactor
ML20198K9441998-01-0808 January 1998
Special Rept:On 971209,reactor Shutdown by High Power Scram Initiated by Wide Range Monitor of Nuclear Instrument Sys. Caused by Unanticipated Positive Reactivity Insertion. Reflector Sample Opened & Inspected
ML20203L0531997-12-31031 December 1997
Reactor Operations Annual Rept,970101-1231, for Univ of Missouri Research Reactor Facility
ML20202H4091997-12-31031 December 1997
Monthly Operating Rept for Dec 1997 for Univ of Mo Research Reactor
ML20197D2751997-12-15015 December 1997
Ro:On 971026 & 1106,slight Elevation of Fission Products Were Detected in Primary Coolant Water Analyses.Caused by Slight Fabrication Flaw in Element MO-460.Surveillance of Bwx Technologies Fabrication Techniques Will Be Increased
ML20202H3931997-11-30030 November 1997
Monthly Operating Rept for Nov 1997 for Univ of Mo Research Reactor
ML20202J1151997-10-31031 October 1997
Monthly Operating Rept for Oct 1997 for Univ of Missouri Research Reactor
ML20202J1201997-09-30030 September 1997
Monthly Operating Rept for Sept 1997 for Univ of Missouri Research Reactor
ML20211B2871997-08-31031 August 1997
Monthly Operating Rept for Aug 1997 for Univ of Missouri Research Reactor
ML20210R2701997-07-31031 July 1997
Univ of Missouri Research Reactor Operations Monthly Summary,July 1997
ML20196G8891997-07-15015 July 1997
Special Rept:On 970616,scram Setpoint for Low Flow Scram for Heat Exchanger 503A Leg Was 25 Gpm Below TS Limit.Caused by Drifting of Setpoint of Vutronik Monitor Switch DPS-928A. Adjusted Trip Setting & Retested Trip Setting
ML20149L3761997-06-30030 June 1997
Monthly Operating Rept for June 1997 for Univ of Mo Research Reactor
ML20141H6451997-05-31031 May 1997
Monthly Operating Rept for May 1997 for Univ of Mo Research Reactor
ML20141H6581997-04-30030 April 1997
Monthly Operating Rept for April 1997 for Univ of Missouri
ML20141H6691997-03-31031 March 1997
Monthly Operating Rept for Mar 1997 for Univ of Missouri
ML20136D7211997-03-0606 March 1997
Safety Evaluation Supporting Amend 29 to License R-103
ML20141H7421997-02-28028 February 1997
Monthly Operating Rept for Feb 1997 for University of Missouri Research Reactor
ML20141H6421997-01-31031 January 1997
Monthly Operating Rept for Jan 1997 for Univ of Mo Research Reactor
ML20141H7001996-12-31031 December 1996
Monthly Operating Rept for Univ of Missouri Research Reactor for Dec 1996
ML20138Q6601996-12-31031 December 1996
Reactor Operations Annual Rept for 1996
ML20141H7221996-10-31031 October 1996
Monthly Operating Rept for Univ of Missouri Research Reactor for Oct 1996
ML20116E2621996-07-30030 July 1996
Ro:On 960701,emergency Generator Shutdown on High Coolant Temp.Caused by Sheared Water Pump Shaft.Replaced Defective Pump
ML20141H6781996-06-30030 June 1996
Monthly Operating Rept for Univ of Missouri Research Reactor for June 1996
ML20149L3721996-05-31031 May 1996
Monthly Operating Rept for May 1996 for Univ of Mo Research Reactor
ML20117L1091996-05-13013 May 1996
Univ of Missouri Research Reactor Operations Monthly Summary for Apr 1996
ML20117L1001996-03-31031 March 1996
Univ of Missouri Research Reactor Operations Monthly Summary for Mar 1996
ML20117L0951996-03-13013 March 1996
Univ of Missouri Research Reactor Operations Monthly Summary for Feb 1996
ML20117L0841996-03-0606 March 1996
Univ of Missouri Research Reactor Operations Monthly Summary for Jan 1996
ML20100J3991996-02-22022 February 1996
Ro:On 960123,reactor Was Shut Down by Manual Scram When Console Operator Determined That Regulating Blade Was Inoperable.Caused by Seized Bearing on Gearbox Input Shaft. Bearing Replaced
ML20097J4391996-01-26026 January 1996
Special Rept:On 951227,reactor Shutdown Occurred Due to Reactor in Operation W/Regulating Blade in Degraded Condition.Replaced Dowel Pin
ML20101F5381995-12-31031 December 1995
Revised Pages III-1 & VII-1 to 1995 Operations Annual Rept
ML20100M7821995-12-31031 December 1995
Univ of Mo Research Reactor Reactor Operations Annual Rept Jan-Dec 1995
1999-09-20
[Table view] |
Text
I Research Reactor Facility UNIVERSITY OF MISSOURI Columbia, M s ur 6521 May 31,1985 Telephone (314) 882-4211 l
Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Mr. Cecil 0. Thomas, Chief Standardization and Special Projects Branch
Reference:
Docket 50-186 University of Missouri Research Reactor License R-103
Subject:
Report as required by Technical Specification 6.1.h(2) concerning reactor operation with one regulating blade position rod run-in inoperable.
Introduction On May 19, 1985, a chain link failed on the drive chain for the regula-ting blade position indicator, such that the position indication failed to respond to regulating blade movement. A reactor rod run-in is initiated by the regulating blade position indication being less than 10% withdrawn.
With the indication not responding to regulating blade movement, this rod run-in function was inoperable, which is a deviation from Technical Specifi-cation 3.4.c.
Description .
. l After taking the 1400 log readings with the reactor operating in auto-matic control, the shif t supervisor noticed that the regulating blade post-tion indication had not changed since the previous reading. The regulating blade drive was verified to be operating properly, but without a correspond- )
ing change in position indication. The reactor was shutdown at 1417 by man- I ual rod run-in due to inability to comply with Technical Specification 3.4.c. l The chain that drives the position indicator was found to have a broken link. The regulating blade less than 10% withdrawn rod run-in is initiated by a micro switch activated by this position indicator.
The drive chain link was repaired and the regulating blade was driven full in so the position indication could be reset to zero to match the blade position. The regulating blade was exercised over its full travel length to verify the indication functions operated properly. The regulating blade rod run-in surveillance portion of MURR Compliance Check 14 was performed to 8506100602 850531 PDR ADOCK 05000186
/
~~$a S PDR j' f, si jg COLUMBIA KANSAS CITY ROLLA ST. LOUIS an equal opportunity institution
Director.of Nuclear Reactor Regulation
-May 31, 1985 Page 2-verify that the regulating blade less than 10% withdrawn RRI and the rod bottom rod run-in operated properly.
Analysis-The regulating blade rod run-ins assure termination of a transient which, in automatic operation, would result in a rapid insertion of the regulating blade. The regulating blade less than 10% withdrawn rod run-in is not required to avoid reaching a limiting safety system setting. Addi-tionally, there is a rod run-in activated by the regulating blade drive mechanism being full in that is independent of the position indicator. ,
Corrective Action As stated in the description section, the reactor was shutdown while the' regulating blade position indication drive chain was repaired on May 19, 1985. During the next scheduled maintenance day, May 23, 1985, the drive chain was replaced with a new heavy duty chain. Additionally, the semi-annual preventive maintenance schedule for the regulating blade drive mecha-nism has been changed to include an inspection of the drive chain and master link with respect to wear and proper tensioning.
Sincerely, Walter A. Meyer Acting Reactor Manager Endorsement:
Reviewed and Approved D. A. Alger P Associate Director
/1s xc: U.S. Nuclear Regulatory Commission
-c/o Document Management Branch James Keppler, Director Regulatory Operations - Region III Reactor Advisory Committee Reactor Safety Subcommittee