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[en] The University Of Missouri operates MURR to provide an intense source of neutron and gamma radiation for research and applications by experimenters from its four campuses and by experimenters from other universities, government and industry. The 10 MW reactor, which has been operating an average of 155 hours per week for the past eight years, produces thermal neutron fluxes up to 6-7x10¹⁴ n/cm²-s in the central flux trap and beamport source fluxes of up to 1.2x10¹⁴ n/cm²-s. The mission of the reactor facility, to promote research, education and service, is the same as the overall mission of the university and therefore, applied research and service supported by industrial firms have been welcomed. The university recognized after a few years of reactor operation that in order to build utilization, it would be necessary to develop in-house research programs including people, equipment and activity so that potential users could more easily and quickly obtain the results needed. Nine research areas have been developed to create a broadly based program to support the level of activity needed to justify the cost of operating the facility. Applied research and service generate financial support for about one-half of the annual budget. The applied and service programs provide strong motivation for university/industry association in addition to the income generated. (author)

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[en] The University of Missouri operates MURR, currently a 10-MW research reactor, to provide an intense source of neutron and gamma radiation for research and applications by experimenters from the four campuses of the University and by experimenters from other universities, government, and industry. The reactor has been continually upgraded during its 18-yr history, escalating from 30 h/week at 5 MW in 1968 to the schedule of the last 7 yr of averaging over 155 h/week at 10 MW. The research programs in the condensed matter sciences (neutron and gamma-ray diffraction and inelastic scattering neutron interferometry, etc.) and in the life sciences (nuclear medicine, radiation therapy, etc.) continually demand increased neutron fluxes. During the last several years, very significant advances have been made in neutron detection systems, in data collection and analysis systems, and in neutron beam filtering techniques, all of which have improved the utilization of available neutrons. The staff of MURR, approx.18 months ago, began an evaluation of the feasibility of further increasing the reactor power level. The results obtained to date are the subject of this paper

[en] The University of Missouri Research Reactor (MURR) is working on licensing a new fuel design. There are two goals for this new fuel design: (1) reduce the fuel cycle cost of the current 10-MW operation; and, (2) provide a core capable of operating at a significantly higher power level for our upgrade. For the first goal, a fuel element with a higher ²³⁵U loading, a higher fissions per cubic metre burnup limit, and a uniform power density are desired. The uniform power density, i.e., low peaking factors, is also very important in obtaining the second goal. The various options considered to achieve these goals (core and element shape, fuel plate design, fuel type, and burnable poisons and varying the amounts of fuel loaded per plate) are described along with the results obtained for the new core design

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