(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
|
|---|
Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20057C4221993-09-22022 September 1993
Ro:On 930910,noticed Fluctuations on Power Channels Due to Element 574 in Position J-7 Becoming Unlatched for Listed Reasons.Subj Element Replaced.Special Instructions Will Be Provided to Operators on Fuel Handling & Monitoring
ML20114D7111992-09-0202 September 1992
Ro:On 920824,several Annunicators Re Reactor in Manual, Servo Deviation Greater than 10% & Clutch Power Off Received.Caused by Shim 3 Slipping & Clutch Current on Low Alarm.Potentiometer Wiped Clean & Current Adjusted
ML20059M1491990-09-25025 September 1990
Special Rept,On 900918:shim 1 Relay Failed to Release Completely Upon Manual Scram.Caused by mercury-wetted- Contact Relay in Manual Scram Circuit of Shim.Relay Replaced & Relays in Sys Checked & Found to Operate Normally
ML20235M4711987-09-23023 September 1987
Ro:On 870911,while Performing Shim Arm Calibr Tests at Low Power,Shim 1 Would Not Drive Out But Would Drive In.Caused by Worn Thrust Bearings on Drive.Drive Reinstalled & Tested Satisfactorily
ML20087N6121984-03-29029 March 1984
Ro:On 840319,following Shim Arm Calibr Test,Shift Arm 1 Did Not Fall.Cause Unknown.New Ball Nut & Screw Assembly Installed
ML20067D9391982-12-0606 December 1982
Ro:On 821126,during Routine Refueling Operations,Fuel Element 345 Fell to Upper Grid in Transfer from Core Position D-1 to D-7.Caused by Operating Difficulty in E-2 Transfer Arm.Element Removed & Seated
1993-09-22
[Table view]
Category:TEXT-SAFETY REPORT
MONTHYEARML20205B0511998-12-31031 December 1998
Operations Rept 51 for Jan-Dec 1998. with
ML20217H4481997-12-31031 December 1997
Operations Rept 50 for Jan-Dec 1997
ML20147H3871997-03-31031 March 1997
Safety Evaluation Supporting Amend 8 to License TR-5
ML20137F2891996-12-31031 December 1996
Operations Rept 49 for Jan-Dec 1996
ML20101K9901995-12-31031 December 1995
Operations Rept 48,for 1995
ML20082B0421994-12-31031 December 1994
NIST Reactor Operations Rept 47 for Jan-Dec 1994
ML20064L2101993-12-31031 December 1993
NIST Reactor (Nbsr) Operations Rept 46 Jan-Dec 1993. W/
ML20057C4221993-09-22022 September 1993
Ro:On 930910,noticed Fluctuations on Power Channels Due to Element 574 in Position J-7 Becoming Unlatched for Listed Reasons.Subj Element Replaced.Special Instructions Will Be Provided to Operators on Fuel Handling & Monitoring
ML20114D7111992-09-0202 September 1992
Ro:On 920824,several Annunicators Re Reactor in Manual, Servo Deviation Greater than 10% & Clutch Power Off Received.Caused by Shim 3 Slipping & Clutch Current on Low Alarm.Potentiometer Wiped Clean & Current Adjusted
ML20094P1721991-12-31031 December 1991
Natl Inst of Stds & Technology Reactor Operations Rept, 1991
ML20070T4301990-12-31031 December 1990
Operations Rept 43 for Natl Inst of Stds & Technology Reactor for 900101-1231
ML20059M1491990-09-25025 September 1990
Special Rept,On 900918:shim 1 Relay Failed to Release Completely Upon Manual Scram.Caused by mercury-wetted- Contact Relay in Manual Scram Circuit of Shim.Relay Replaced & Relays in Sys Checked & Found to Operate Normally
ML20043A4791990-05-15015 May 1990
Ro:On 900505,leak Discovered in Cooling Water Basin Steam Lines.Caused by Increasing Tritium Levels in Hx.Permanent Plug Installed in Steam Line
ML20248J1901988-12-31031 December 1988
Operations Rept 41 for 1988
ML20195B3931988-06-10010 June 1988
Safety Evaluation Supporting Amend 6 to License TR-5
ML20151U3541987-12-31031 December 1987
Corrected Operations Rept 40,1987
ML20148N6081987-12-31031 December 1987
Operations Rept 40,Jan-Dec 1987
ML20235M4711987-09-23023 September 1987
Ro:On 870911,while Performing Shim Arm Calibr Tests at Low Power,Shim 1 Would Not Drive Out But Would Drive In.Caused by Worn Thrust Bearings on Drive.Drive Reinstalled & Tested Satisfactorily
ML20237J2201987-02-28028 February 1987
Penetrations in Reactor Bldg for New Hot Plug Storage,Hx Vault & Neutron Beam Tubes, Study Rept
ML20206D7691986-12-31031 December 1986
Operations Rept 39,1986
ML20202D3001985-12-31031 December 1985
Operations Rept 38,1985
ML20116H5891984-12-31031 December 1984
Operations Rept 37,1984
ML20098G3611984-08-31031 August 1984
SAR on D2O Cold Neutron Source for Nbs Reactor
ML20087N6121984-03-29029 March 1984
Ro:On 840319,following Shim Arm Calibr Test,Shift Arm 1 Did Not Fall.Cause Unknown.New Ball Nut & Screw Assembly Installed
ML20087N5901983-12-31031 December 1983
Semiannual Operating Rept 36,Jul-Dec 1983
ML20080K4781983-09-0808 September 1983
Operations Rept,Jan-June 1983
ML20072L3421983-03-18018 March 1983
Operations Rept 34,Jul-Dec 1982
ML20067D9391982-12-0606 December 1982
Ro:On 821126,during Routine Refueling Operations,Fuel Element 345 Fell to Upper Grid in Transfer from Core Position D-1 to D-7.Caused by Operating Difficulty in E-2 Transfer Arm.Element Removed & Seated
ML20063P1801982-09-30030 September 1982
Operations Rept 33,Jan-June 1982
ML20050B5401982-03-30030 March 1982
Semiannual Operating Rept,Jul-Dec,1981.
ML20010G1941981-09-10010 September 1981
Semiannual Operating Rept for Jan-June 1981
ML20038B2531981-08-26026 August 1981
Natl Bureau of Stds Reactor.
ML20009H0111981-07-28028 July 1981
Ro:On 810717,no Deuterium Oxide Level Indication Discovered. Caused by Substance Draining Into Storage Tank Due to Failure of Valve DWV-39 to Close.Revised Procedures Instituted to Upgrade Insp Requirements
ML19343C4501981-03-20020 March 1981
Operations Rept 30 for Jul-Dec 1980.
ML19347B2911980-09-26026 September 1980
Semiannual Operating Rept,Jan-June 1980.
ML19340E2031980-04-0808 April 1980
Semiannual Operating Rept 28,Jul-Dec 1979.
ML20125D0401979-10-26026 October 1979
Rept on Nature & Source of Radioactive Matl Found at Nbs Reactor Site
ML19208D5251979-09-28028 September 1979
Operations Rept 27, Jan-June 1979
ML20214M9261966-12-16016 December 1966
Suppl B of FSAR on Nbs Reactor
ML20214M9321966-10-0101 October 1966
Suppl a of FSAR on Nbs Reactor
ML20214M9461961-01-0101 January 1961
Preliminary Hazards Summary Rept
1998-12-31
[Table view] |
Text
, _ _ _ _ _. -- - _ _ _ _ ~ _ _ _ _ _ _ _ _ _ _ . .
eve
/ UNIT 3D DTATES DEPAATMENT OF COMMERCI
/ v !" National Institute of Standa, da and Technology
%rus 3,l (301) 975-6210 FAX # 869-4770 September 2, 1992 U.S. Nuclear Regulatory Commission Attention: Document Control-Desk Washington, D.C. . 20555
Subject:
Information Letter, Docket No. 50-184 Gentlemen On August 24, 1992 with the reactor operating routinely in ,
automatic,-several annunciators were received - reactor in manual, servo aeviation greater than 10%, and clutch power off.
Reactor power decreased to about 10%. Shim No. 3 had slipped from 26* to about 21.4' r.nd its clutch current was on the low alarm.- The clutch current was reset and indicated normal. The shim was pulled back to position, but a short time later, tha same slippage occurred. The' current potentiometer was wiped clean and the-current adjusted.- However upon pulling the shim again, current monitor fluctuations were noted and as a result the reactor was shutdown.- Subsequent checking determined that chim No. 3 clutch output card was faulty. A spare card was installed and its operation was verified, after which the reactor was restarted. Since-then, reactor. operation proceeded normally.
Sincerely, J. Michael Rowe ief, Reactor Radiation Division l cct- Project Scientist L U.S.-Nuclear Regulatory Commission Region 1 475 Allendale Road.
L King of Prussia, PA 19406 Project Manager Non-Power Reactor Directorate U.S. Nuclear Regulatory Commission Washington, D.C. 20555
? I l
9207090271 920902 /g ,
l ADOCK 05000184 PDR 5
--va, PDR
}f,$ ? fa}' [-
. _ ,