A neutronic feasibility study for LEU conversion of the WWR-SM research reactor in Uzbekistan. Page: 4 of 14
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A NEUTRONIC FEASIBILITY STUDY FOR LEU CONVERSION OF THE WWR-SM
RESEARCH REACTOR IN UZBEKISTAN
Institute of Nuclear Physics,
Ulugbek, 702132 Tashkent, Uzbekistan
J.R. Deen, N.A. Hanan and J.E. Matos
Argonne National Laboratory,
Argonne, Ill, USA 60349-4841
The WWR-SM research reactor in Uzbekistan has operated at 10 MW since 1979,
using Russian-supplied IRT-3M fuel assemblies containing 90% enriched
uranium. Burnup tests of three full-sized IRT-3M FA with 36% enrichment were
successfully completed to a burn up of about -50% in 1987-1989. In August
1998, four IRT-3M FA with 36% enriched uranium were loaded into the core to
initiate conversion of the entire core to 36% enriched fuel. This paper presents the
results of equilibrium fuel cycle comparisons of the reactor using HEU (90%) and
HEU (36%) IRT-3M fuel and compares results with the performance of IRT-4M
FA containing LEU (19.75%). The results show that an LEU (19.75%) density of
3.8 g/cm3 is required to match the cycle length of the HEU (90%) core and an
LEU density 3.9 g/cm3 is needed to match the cycle length of the HEU (36%)
The WWR-S research reactor at the Institute of Nuclear Physics of the Uzbek Academy of
Sciences is located in Ulugbek, 30 km north-east of Tashkent. The reactor was put into operation
at a power level of 2 MW in September 1959. It was reconstructed in 1971-1979 to upgrade the
reactor power and enhance the experiment capacity of the reactor. The reactor is designated to
carry out experiments in field of nuclear physics and nuclear engineering, neutron activation
analysis, solid state physics and isotope production. To perform these experiments, it originally
had 9 vertical irradiation channels, a thermal column, and 9 horizontal beam tubes.
In course of time, the experimental needs increased, which the reactor could not meet. In
September 1971 the reactor was shutdown to be reconstructed. The reconstruction project was
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Rakhmanov, A. A neutronic feasibility study for LEU conversion of the WWR-SM research reactor in Uzbekistan., article, October 19, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc625788/m1/4/: accessed February 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.