ML20082K591
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| ML20082K591 | |
| Person / Time | |
|---|---|
| Site: | MIT Nuclear Research Reactor |
| Issue date: | 08/22/1991 |
| From: | Bernard J, Kwok K MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 50-20-1991-1, NUDOCS 9108300133 | |
| Download: ML20082K591 (5) | |
Similar Documents at MIT Nuclear Research Reactor | |
|---|---|
Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20205A6551999-03-19019 March 1999
[Table view]Ro:On 990310,main Ventilation Damper Failed to Close on Receipt of High Radiation Test Signal.Cause Indeterminate. Relays Associated with Main Exhaust Damper/Fans & Main Intake Damper Were Replaced ML20206P5321999-01-0606 January 1999 Ro:On 981229,only One Nuclear Safety Period Scram Channel Was Operable,For Period of Five Minutes.Caused by Placement of Nuclear Safety Sys Channel 1 Input Signal Cable on Wrong Bnc Connector.Placed Channel on Correct Bns Connector ML20217E8071998-03-23023 March 1998 Ro:On 980127,containment Integrity No Longer Existed & Key Switch Was Still 'On' for One of Test & Calibr Procedures. Caused by Retrieving Tool Box from Truck Air Lock.Discussed Occurrence W/Personnel & Will Consider TS Rev Re Key Switch ML20092K8281995-09-22022 September 1995 Corrective Action for RO 50-20/1995-4,re Abnormal Situations Which Occurred on 950711 ML20091K3091995-08-18018 August 1995 Ro:On 950809,malfunction of Shim Blade Drive Mechanism Occurred.Determined That Mechanism Experienced Intermittent Slippage When Blade Being Withdrawn.Blade Drive Mechanism Assembly Procedure PM 7.1.1.1 Will Be Reviewed ML20086T7571995-07-28028 July 1995 RO 50-20/1995-4:on 950720,operated W/One Shim Blade Fully Inserted.Caused by Failure of Licensed Operators to Follow Written Procedure for Investigating Mismatch.Failed Proximity Switches Replaced ML20082B8551995-03-30030 March 1995 RO 50-20/1995-2:on 950320,operation of Reactor in natural- Circulation Mode W/O Required Two Operable Nuclear Safety Level Channels Set to Scram at or Less than 100 Kw,Mitr TS 3.7 ML20078S2241995-02-17017 February 1995 Reportable Occurrence 50-020/95-01:on 950206,voltage & Specific Gravity Measurements of Cell of Emergency Battery Bank Recorded at Less than Specified Weekly SR in TS 4.3.5. C/A Will Modify SR to Monthly ML20058Q2371993-12-17017 December 1993 RO 50-20/1993-1:on 931207,operation W/Fewer than Required Number of 100 Kw Nuclear Safety Sys Level Channels Identified.Caused by Faulty four-segment Relay in low-range Amplifier of Channel 5.Amplifier Replaced ML20094K0721992-03-12012 March 1992 RO 50-020/1992-2:on 911030,three Fission Chambers Missing During Annual Inventory of SNM Matl.Search for Missing Chambers Completed on 920311 W/O Locating Chambers.Snm Inventory for 1991 Has Been Amended ML20090D6661992-03-0202 March 1992 RO 50-20/92-1 on:920218,malfunction Occurred in Reactor Analog Controller Due to Improper Performance of Increase in Reactor Power.Caused by Operator Error.Analog Automatic Control Sys Investigated & Temporarily Repaired ML20082K5911991-08-22022 August 1991 RO 50-20/1991-1:on 910813,fission Product Gas Levels Rose from Normal Operating Levels to Max of 15% of Mpc.Caused by Small Blister on One of Element MIT-17 Fuel Plates. Corrective Action Consisted of Removing MIT-17 from Core ML20248C7111989-08-0404 August 1989 RO 50-20/1989-2:on 890726,console Operator Received Abnormal Bldg Alarm.Leak Test Revealed Crack on Sys Ref Line Which Senses Atmospheric Pressure Outside Containment.All Polyethylene Tubing in Sys Replaced ML20246P3071989-03-17017 March 1989 RO 50-20/1989-1:on 890308,operation W/Fewer than Required Number of Nuclear Safety Channel Level Scrams Due to Lack of High Voltage Power Supply (Hvps) to Channel 5.Reactor Shut Down & Hvps Energized to Supply Channel 5 ML20154M6501988-05-26026 May 1988 RO 50-20/1988-1:on 880511,incipient Fuel Clad Defect Detected.Caused by Small Blister on One Element MIT-12 Fuel Plate.Element MIT-12 Removed from Core ML20236S4931987-11-19019 November 1987 RO 50-20/1987-2:on 871110,improper Performance of Reactor Reshim Resulted in Excessive Power Rise.Caused by Operator Error.Operator Suspended from All Licensed Duties Pending Further Review of Circumstances & Disciplinary Measures ML20213G0601986-11-0606 November 1986 RO 50-20/1986-3:on 861027,shim Blade 6 Could Not Operate at full-out Position Due to Mechanical Interference.Caused by Misalignment of Blade Proximity Switch Tube.Switch Tube Reinstalled Properly ML20214V9001986-10-17017 October 1986 Revised RO 50-20/1986-2:on 861008,elevated Levels of Fission Gases Discovered in Primary Containment.Cause Undetermined. Refueling Initiated & Element MIT-19 Removed.All in-core Elements Sipped.No Abnormalities Found ML20214H9541986-10-17017 October 1986 RO 50-020/86-02:on 861008,elevated Levels of Fission Gases in Primary Containment Observed.Cause Unknown.Element MIT-19 Removed from Core & All in-core Elements Sipped ML20154S4591986-02-28028 February 1986 RO 50-20/1986-1:on 860219,fission Product Gas Levels Rose from Normal Operating Levels.Caused by Blister on Surface of Outer Fuel Plate of Element MIT-11.Element MIT-11 Removed from Core ML20137G3661985-07-23023 July 1985 RO 50-20/1985-2:on 850715,defect in Fuel Element Cladding Observed.Caused by High Rate of Outgassing from Fuel Element MIT-32.Defective Element Removed ML20137G3531985-04-18018 April 1985 RO 50-20/1985-1:on 850408,main Intake Valve Failed Light Test Maint Procedure.Caused by Excessive Wear of Valve Gasket.Gasket Replaced ML20081H8191983-09-15015 September 1983 RO 50-20/1983-2:on 830906,fission Product Gas Levels Rise from 2.8% Max Permissible Concentration in Jul 1983 to 4.57% in Aug Noted.Caused by Excessive Outgassing of Fuel Element MIT-08.Element Removed from Core ML20074A7521983-04-29029 April 1983 RO 50-20/1983-1:on 830419,main Intake Valve Closed & Could Not Be Reopened.Caused by Piston Rod Rupture Near Rod Eye, Leaving Valve in Closed Position.Defective Hydraulic Cylinder Shaft Replaced ML20063B9221982-08-17017 August 1982 Ro:On 820809,slight Increase Found in Levels of Fission Products in Reactor Primary Sys.Cause Under Investigation. Criterion for Operation W/Possible Faulty Core Element Per RO 50-20/79-4 Will Be Observed 1999-03-19 Category:TEXT-SAFETY REPORT MONTHYEARML20209C9331999-07-0808 July 1999
[Table view]Vols 1 & 2 to SAR for Ma Institute of Technology Nuclear Reactor Lab ML20196K0331999-06-30030 June 1999 Quality Mgt Program for Generation of MITR-II Medical Therapy Facility Beams for Human Therapy, Reflecting Change to Provision 14 ML20205A6551999-03-19019 March 1999 Ro:On 990310,main Ventilation Damper Failed to Close on Receipt of High Radiation Test Signal.Cause Indeterminate. Relays Associated with Main Exhaust Damper/Fans & Main Intake Damper Were Replaced ML20206P5321999-01-0606 January 1999 Ro:On 981229,only One Nuclear Safety Period Scram Channel Was Operable,For Period of Five Minutes.Caused by Placement of Nuclear Safety Sys Channel 1 Input Signal Cable on Wrong Bnc Connector.Placed Channel on Correct Bns Connector ML20199H2371998-12-31031 December 1998 Revised SER for Fission Converter Facility ML20196B7541998-06-30030 June 1998 Mit Research Reactor Nuclear Reactor Lab Ma Inst of Technology,Annual Rept to Us NRC for Period 970701-980630. with ML20217E8071998-03-23023 March 1998 Ro:On 980127,containment Integrity No Longer Existed & Key Switch Was Still 'On' for One of Test & Calibr Procedures. Caused by Retrieving Tool Box from Truck Air Lock.Discussed Occurrence W/Personnel & Will Consider TS Rev Re Key Switch ML20217G2181997-10-0303 October 1997 SER for Fission Converter Facility ML20198P8071997-06-30030 June 1997 Annual Operating Rept for Jul 1996 - June 1997 ML20137L5901997-04-0303 April 1997 Safety Evaluation Supporting Amend 30 to License R-37 ML20129B3201996-06-30030 June 1996 Annual Rept to Us NRC for Period 950701-960630 ML20092K8281995-09-22022 September 1995 Corrective Action for RO 50-20/1995-4,re Abnormal Situations Which Occurred on 950711 ML20091K3091995-08-18018 August 1995 Ro:On 950809,malfunction of Shim Blade Drive Mechanism Occurred.Determined That Mechanism Experienced Intermittent Slippage When Blade Being Withdrawn.Blade Drive Mechanism Assembly Procedure PM 7.1.1.1 Will Be Reviewed ML20086T7571995-07-28028 July 1995 RO 50-20/1995-4:on 950720,operated W/One Shim Blade Fully Inserted.Caused by Failure of Licensed Operators to Follow Written Procedure for Investigating Mismatch.Failed Proximity Switches Replaced ML20092K2301995-06-30030 June 1995 Mit Research Reactor Annual Rept to NRC for Period Jul 1994 - June 1995 ML20082B8551995-03-30030 March 1995 RO 50-20/1995-2:on 950320,operation of Reactor in natural- Circulation Mode W/O Required Two Operable Nuclear Safety Level Channels Set to Scram at or Less than 100 Kw,Mitr TS 3.7 ML20078S2241995-02-17017 February 1995 Reportable Occurrence 50-020/95-01:on 950206,voltage & Specific Gravity Measurements of Cell of Emergency Battery Bank Recorded at Less than Specified Weekly SR in TS 4.3.5. C/A Will Modify SR to Monthly ML20072T3041994-06-30030 June 1994 Annual Rept for Mit Research Reactor for 930701-940630 ML20058Q2371993-12-17017 December 1993 RO 50-20/1993-1:on 931207,operation W/Fewer than Required Number of 100 Kw Nuclear Safety Sys Level Channels Identified.Caused by Faulty four-segment Relay in low-range Amplifier of Channel 5.Amplifier Replaced ML20056G8011993-06-30030 June 1993 Mit Research Reactor Nuclear Reactor Lab Mit,Annual Rept to NRC for Period 920701-930630 ML20128P4371993-02-16016 February 1993 Safety Evaluation Supporting Amend 27 to License R-37 ML20073H1451992-12-0909 December 1992 Study of MITR-II Core Tank Aging for Relicensing Consideration ML20114D9261992-06-30030 June 1992 Mit Research Reactor Nuclear Reactor Lab Mit,Annual Rept to NRC for 910701-920630 ML20094K0721992-03-12012 March 1992 RO 50-020/1992-2:on 911030,three Fission Chambers Missing During Annual Inventory of SNM Matl.Search for Missing Chambers Completed on 920311 W/O Locating Chambers.Snm Inventory for 1991 Has Been Amended ML20090D6661992-03-0202 March 1992 RO 50-20/92-1 on:920218,malfunction Occurred in Reactor Analog Controller Due to Improper Performance of Increase in Reactor Power.Caused by Operator Error.Analog Automatic Control Sys Investigated & Temporarily Repaired ML20082K5911991-08-22022 August 1991 RO 50-20/1991-1:on 910813,fission Product Gas Levels Rose from Normal Operating Levels to Max of 15% of Mpc.Caused by Small Blister on One of Element MIT-17 Fuel Plates. Corrective Action Consisted of Removing MIT-17 from Core ML20082L8451991-06-30030 June 1991 Mit Research Reactor Annual Rept to NRC for Jul 1990 to June 1991 ML20058N5741990-08-10010 August 1990 QA Program for MITR-II Spent Fuel Shipment ML20059G4331990-06-30030 June 1990 Mit Research Reactor Annual Rept to NRC for Jul 1989 - June 1990 ML20012D9651990-03-22022 March 1990 RO 50-20/1990-1:on 900312,incorrect Calculation of Estimated Critical Position (ECP) Attained During Reactor Startup. Caused by Failure to Check Second Portion of ECP Calculation Performed by Individual in Training ML20012C2771990-03-0909 March 1990 SER for BWR Coolant Chemistry Loop to Be Installed & Operated in Mitr ML20248C7111989-08-0404 August 1989 RO 50-20/1989-2:on 890726,console Operator Received Abnormal Bldg Alarm.Leak Test Revealed Crack on Sys Ref Line Which Senses Atmospheric Pressure Outside Containment.All Polyethylene Tubing in Sys Replaced ML20247H7041989-06-30030 June 1989 Mit Research Reactor Annual Rept for Jul 1988 - June 1989 ML20246P3071989-03-17017 March 1989 RO 50-20/1989-1:on 890308,operation W/Fewer than Required Number of Nuclear Safety Channel Level Scrams Due to Lack of High Voltage Power Supply (Hvps) to Channel 5.Reactor Shut Down & Hvps Energized to Supply Channel 5 ML20195K1161988-10-24024 October 1988 Suppl to PWR Loop Ser:Use of Large Circulating Pump ML20154J6221988-08-29029 August 1988 Revised Mit Research Reactor Annual Rept to NRC for Jul 1987 - June 1988 ML20153F5591988-06-30030 June 1988 Mit Research Reactor Annual Rept to NRC for Jul 1987 - June 1988 ML20154M6501988-05-26026 May 1988 RO 50-20/1988-1:on 880511,incipient Fuel Clad Defect Detected.Caused by Small Blister on One Element MIT-12 Fuel Plate.Element MIT-12 Removed from Core ML20151R7341988-04-19019 April 1988 Sser for PWR Coolant Chemistry Loop (Pccl) MITNRL-020 ML20236S4931987-11-19019 November 1987 RO 50-20/1987-2:on 871110,improper Performance of Reactor Reshim Resulted in Excessive Power Rise.Caused by Operator Error.Operator Suspended from All Licensed Duties Pending Further Review of Circumstances & Disciplinary Measures ML20237K6121987-06-30030 June 1987 Mit Research Reactor Annual Rept to NRC for Jul 1986 - June 1987 ML20151R7271987-02-13013 February 1987 SER for PWR Coolant Chemistry Loop (Pccl) MITNRL-020 ML20213G0601986-11-0606 November 1986 RO 50-20/1986-3:on 861027,shim Blade 6 Could Not Operate at full-out Position Due to Mechanical Interference.Caused by Misalignment of Blade Proximity Switch Tube.Switch Tube Reinstalled Properly ML20214V9001986-10-17017 October 1986 Revised RO 50-20/1986-2:on 861008,elevated Levels of Fission Gases Discovered in Primary Containment.Cause Undetermined. Refueling Initiated & Element MIT-19 Removed.All in-core Elements Sipped.No Abnormalities Found ML20214H9541986-10-17017 October 1986 RO 50-020/86-02:on 861008,elevated Levels of Fission Gases in Primary Containment Observed.Cause Unknown.Element MIT-19 Removed from Core & All in-core Elements Sipped ML20148B3011986-06-30030 June 1986 Mit Research Reactor Annual Rept to NRC for Period Jul 1985 - June 1986 ML20154S4591986-02-28028 February 1986 RO 50-20/1986-1:on 860219,fission Product Gas Levels Rose from Normal Operating Levels.Caused by Blister on Surface of Outer Fuel Plate of Element MIT-11.Element MIT-11 Removed from Core ML20214R3811986-01-31031 January 1986 Rept of Educational & Research Activities for Academic/ FY84-85 W/Selected Data from Previous Yrs ML20137G3661985-07-23023 July 1985 RO 50-20/1985-2:on 850715,defect in Fuel Element Cladding Observed.Caused by High Rate of Outgassing from Fuel Element MIT-32.Defective Element Removed ML20133H4081985-06-30030 June 1985 Mit Research Reactor Annual Rept to Us NRC for Jul 1984 - June 1985 1999-07-08 |
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