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Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20211C7951997-09-18018 September 1997
Ro:On 970916,reactor Staff Discovered That Intrusion Alarm Sys Was Not Tested for Operability During First Calendar Wk of Sept.Caused by Other Members Being on Leave or Alternate Duty.All Sys Tests Were Properly Documented
ML20096C5351996-01-11011 January 1996
Ro:On 960104,Shim-2 Control Rod Stopped at 917 Units. Operator Went Out on Reactor Bridge to Check Rod.After Examining Rod,Operator Shook Barrel & Rod Fell Into Core. Reactor Remains in Shutdown Condition
ML20082P0161991-09-0303 September 1991
Ro:On 910830 Analog scram-capable Safety Channel of Dow Triga Research Reactor Found to Be Not Operating During power-up Operation of Reactor.Caused by Broken Connection in high-voltage Cable for Neutron Detector.Broken Cable Fixed
ML20082N6131991-08-30030 August 1991
RO:analog-capable Safety Channel of Reactor Inoperable During Reactor Operation.Caused by Broken Connection in High Voltage Cable for Neutron Detector.Reactor Shutdown & Secured
ML20210B2751987-03-18018 March 1987
Ro:Holes Found in Aluminum Reactor Tank Line.Cause Unknown. Operations Suspended Until Extent of Problem & Solution Determined.Proposed Actions to Correct Problem Will Be Submitted Prior to Resuming Operations
1997-09-18
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Category:TEXT-SAFETY REPORT
MONTHYEARML20202E9081998-12-31031 December 1998
Geological Survey Triga Reactor Annual Rept for Period Jan- Dec 1998. with
ML20206K7031998-12-31031 December 1998
Revised Us Geological Survey Triga Reactor Annual Rept,Jan- Dec 1998
ML20217A2151998-04-15015 April 1998
Safety Evaluation Supporting Amend 9 to License R-113
ML20216H7811998-03-16016 March 1998
Safety Evaluation Supporting Amend 8 to License R-113
ML20202H1471997-12-31031 December 1997
USGS Triga Reactor Annual Rept for Jan-Dec 1997
ML20247F8221997-12-31031 December 1997
Corrected Pages for 1997 Annual Rept of USGS Survey Triga Reactor Facility, Originally Submitted on 980202,IAW License Conditions
ML20211C7951997-09-18018 September 1997
Ro:On 970916,reactor Staff Discovered That Intrusion Alarm Sys Was Not Tested for Operability During First Calendar Wk of Sept.Caused by Other Members Being on Leave or Alternate Duty.All Sys Tests Were Properly Documented
ML20096C5351996-01-11011 January 1996
Ro:On 960104,Shim-2 Control Rod Stopped at 917 Units. Operator Went Out on Reactor Bridge to Check Rod.After Examining Rod,Operator Shook Barrel & Rod Fell Into Core. Reactor Remains in Shutdown Condition
ML20096G1881995-12-31031 December 1995
USGS Triga Reactor Annual Rept for Jan-Dec 1995
ML20078A6451994-12-31031 December 1994
USGS Triga Reactor Annual Rept for 1994
ML20063C6501993-12-31031 December 1993
USGS Survey Triga Reactor Annual Rept for Jan-Dec 1993. W/
ML20127N4481992-12-31031 December 1992
USGS Triga Reactor Annual Rept for Jan-Dec 1992
ML20087F3971991-12-31031 December 1991
Us Geological Survey Triga Reactor Annual Rept 910101-1231
ML20082P0161991-09-0303 September 1991
Ro:On 910830 Analog scram-capable Safety Channel of Dow Triga Research Reactor Found to Be Not Operating During power-up Operation of Reactor.Caused by Broken Connection in high-voltage Cable for Neutron Detector.Broken Cable Fixed
ML20082N6131991-08-30030 August 1991
RO:analog-capable Safety Channel of Reactor Inoperable During Reactor Operation.Caused by Broken Connection in High Voltage Cable for Neutron Detector.Reactor Shutdown & Secured
ML20066K5821990-12-31031 December 1990
Corrected Annual Rept of USGS Triga Reactor Facility 1990
ML20066H8881990-12-31031 December 1990
Annual Rept of USGS Triga Reactor Facility 1990
ML20006A5611989-12-31031 December 1989
USGS Triga Reactor Annual Rept 1989. W/900118 Ltr
ML20246F6621989-04-30030 April 1989
Reactor Operator Requalification Program,Usgs Triga Reactor
ML20149E5581988-01-0404 January 1988
Safety Evaluation Supporting Amend 4 to License R-113
ML20150A7641987-12-31031 December 1987
USGS Triga Reactor Annual Rept,1987
ML20210B2751987-03-18018 March 1987
Ro:Holes Found in Aluminum Reactor Tank Line.Cause Unknown. Operations Suspended Until Extent of Problem & Solution Determined.Proposed Actions to Correct Problem Will Be Submitted Prior to Resuming Operations
ML20210E4261986-12-31031 December 1986
USGS Triga Reactor Annual Rept for 1986
ML20137P4431985-12-31031 December 1985
Us Geological Survey Triga Reactor Annual Rept,1985
ML20079P6951983-12-31031 December 1983
Annual Operating Rept for 1983
ML20028G0771982-12-31031 December 1982
Annual Rept 1982.
ML20040F5761981-12-31031 December 1981
Annual Rept 1981.
ML20003A4871980-12-31031 December 1980
Annual Rept,Jan-Dec 1980.
ML19296B3521979-12-31031 December 1979
Annual Operating Rept 1979
ML19250A8001979-10-10010 October 1979
Ro:On 791009,power Signal Was Lost About 60-s After Reactor Reached 1 MW Power Level.Reactor Immediately Shut Down. Caused by Moisture Shorting Signal Line Whose Coaxial Connector Was Lying in Water Near Reactor Tank
ML19256A8441978-12-31031 December 1978
1978 Annual Rept for Triga Reactor.Prime Function Was to Provide Neutrons for Various Research Programs.Irradiations Were Also Done for Other Govt Agencies
1998-04-15
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g United States Department of the Interior
!- l' GEOL.OGICAL SURVEY l B O X 25016 M .S. 974 .
i DENVER FEDERAL CENTER DENVER, COI.ORADO 80225 n um s umn m
- l. Director, Division of Reactor Licensing January 11, 1996 Document Control Desk U.S.. Nuclear Regulatory Commission' Washington, D.C. 20555 Re: USGS TRIGA Reactor Facility Docket No. 50-274, License.R-113 This letter constitutes our written report regarding the incident reported by telephone on January 4, 1996 as required by our Operatfng License.-
An outline of the incident: On January 4, 1996, the reactor was operated at 1MW for 8Hr. 14 Min. for a routine irradiation.
At the time for shutdown, the operator drove the four control rods in using the rod down switches. All four rods started driving in and the reactor power decreased rapidly but the operator noticed that the Shim-2 control rod stopped at 917 units, (from a last recorded operating position of 954 units on a O to 1000 unit scale.) The other rods continued to drive in until, at about 200 units, the operator scrammed the reactor.
Three rods dropped into the core. At this time the reactor was subcritical by more than $5.00, but Shim-2 rod stayed at 917 units. The operator notified the Acting Reactor Supervisor and he went out on the reactor bridge to check Shim-2 rod. The rod was at an elevated position and not in the core. After examining the rod drive he shook the barrel on Shim-2 and the rod fell into the core. The failure of the control rod to be inserted into the core upon shutdown was reported to the NRC at about 1645 Hr. on January 4, 1996.
Since the initial telephone report, the Reactor Staff has .
been in daily contact with NRC Region IV personnel. As of this l date, the Reactor remains in a shutdown condition.
Paul G. Helfer fwf /h r Acting Reactor Sup6Evisor CC to Region IV Compliance Office.
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