ML052020066

June 2005 Monthly Operating Report for University of Missouri - Columbia Research Reactor

ML052020066
Person / Time
Site:	University of Missouri-Columbia
Issue date:	07/08/2005
From:	Foyto L Univ of Missouri - Columbia
To:	Alexander Adams Office of Nuclear Reactor Regulation
References
Download: ML052020066 (5)

Text

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Research Reactor Center Research Park Columbia, MO 65211 University of Missouri-Columbia PHoNE (573) 882-42 11 FAX (573) 882-6360 July 8, 2005 Mr. Alexander Adams, Jr.

U.S. Nuclear Regulatory Commission Mail Stop 0 12-G 13 Washington, DC 20555-0001

REFERENCE:

Docket No. 50-186 University of Missouri- Columbia Research Reactor Amended Facility License R-103

SUBJECT:

MURR Operations Monthly Summary

Dear Mr. Adams:

Enclosed is a copy of MURR's Monthly Operations Summary for June 2005. If you have any questions, please contact me at (573) 882-5276.

Sincerely, slie P. Foyto Reactor Manager LPF/djr Enclosure Li AN EQUAL OPPORNITIY/ADA LNSTmTlON

UNIVERSITY OF MISSOURI RESEARCH REACTOR OPERATIONS MONTHLY

SUMMARY

June 2005 Prepared by:

Operations Staff

INTRODUCTION The reactor operated continuously in June with the following exceptions: Four shutdowns for scheduled maintenance and refueling. One Licensee Event Report, No. 05-02, was submitted within the Technical Specification required thirty-day time requirement.

MAINTENANCE ACTIVITIES 6/2/05 Replaced the roots blower for the NMC model RAK Radiation Stack Monitor.

6/6/05 Refueled - removed core 05-27, loaded core 05-28.

Zeroed, spanned and calibrated the Pool Coolant System Flow Transmitter 912D.

6/13/05 Refueled - removed core 05-28, loaded core 05-29.

Performed a backflush on the Secondary Coolant Side of the Pool Coolant System Heat Exchanger 521.

6/20/05 Refueled - removed core 05-29, loaded core 05-30.

Replaced the Rod Run-In Trip Actuator Amplifier.

Replaced the Secondary Coolant System pH controller.

6/22/05 Completed CP-31 (Calibration of the Eberline Radiation Stack Monitor).

6/27/05 Refueled - removed core 05-30, loaded core 05-3 1.

Replaced a fuse on the display control card for the Rod Position Indication system remote Operator Display Assembly.

Page 2 of 3

LICENSEE EVENT REPORT LER No. 05-02 dated June 6, 2005 On June 6, 2005 during a normally scheduled reactor shutdown, it was discovered that the head pin, which secures the hold-down rod assembly for the three-tube flux trap sample holder, had been improperly installed during the previous reactor shutdown, May 30, 2005. Failure to have the head pin properly installed resulted in a deviation from Technical Specification (TS) 3.6.e; one of fifteen (15) Limiting Conditions for Operation regarding experiments.

TS 3.6.e states, "Only movable experiments in' the center test hole shall be removed or installed with the reactor operating. All other experiments in the center test hole shall be removed or installed only with the reactor shut down. Secured experiments shall be rigidly held in place during reactor operation." Additionally, TS definition 1.24 for a secured experiment states "A secured experiment is any experiment which is rigidly held in place by mechanical means with sufficient restraint to withstand any anticipated forces to which the experiment might be subjected." Failure to have the head pin properly installed resulted in a component of a secured experiment, which was installed in the center test hole, not being rigidly held in place during reactor operation.

It should be noted that the flux trap sample holder itself was at all times rigidly held in place while inserted into the reactor. As described in the Safety Analysis section of the Report, the reactivity worth of the sample holder is approximately 75% of the total reactivity worth of the experiment. The reactivity worth of all of the samples and spacers in the holder was only 0.00114 AK - slightly greater than the TS limit for a movable experiment. The reactivity that could have been introduced by movement of these samples and spacers in all three tubes was only 0.00037 AK, less than the limit for a movable experiment. Furthermore, any potential movement of samples or spacers was confined within the sample holder. Therefore, no reactor safety hazard existed with the flux trap sample holder pin improperly installed during reactor operation.

Detailed analysis of the event and any corrective actions are included in Licensee Event Report No. 05-02.

Page 3 of 3

OPERATION

SUMMARY

FOR MONTH OF I Jun-05 g University of Missour Research Reactor Center (MURR)

HOURS OPERATED THIS PERIOD 671.59 TOTAL HOURS OPERATED, REACTOR 1267,063.60 1 HOURS OPERATED AT FULL POWER, THIS PERIOD 670.17 TOTAL HOURS AT FULL POWER, REACTOR L263,702.36 INTEGRATED POWER THIS PERIOD 1 279.33 MWD TOTAL INTEGRATED POWER, REACTOR !104,077.93 MWD Submitted by: ByDa- k MWD Custodian/Reactor Physicist Date: -JU-nte 3 so Do 0 b