A brief description and the planned operating parameters of the :ORNL-MPR-44 MSPR In-Pile Loop are given together with the operating characteristics of the major components of the loop.
Candidate high-temperature gas-cooled reactor fissile and fertile particles were irradiated in the High Flux Isotope Reactor removable beryllium reflector facility (RB-5) for eight reactor cycles. The experiment contained 18 different "types" of fissile particles and five• different "t~~es" of fertile particles. All uranium was 20% enriched in 2 u. The loose particles were loaded into "trays" that resemble flat graphite washers, each having 116 drilled holes in one face. One hundred eighty-four trays were stacked in columns in an alternate fertile particle-fissile particle sequence. The particles were irradiated for 169.4 full power days. Peak fuel burnup in percent fissions per initial heavy metal atom (FIMA) was as follows: ~20.5% for mixed-oxide fissile particles, ~33.5% for the other fissile particles, and ~7% for fertile particles. Maximum fast neutron fluence (E > 183 KeV) at the end of the test was ~7 x 10 25 neutrons/m 2 • The report discusses methods used to specify particle loadings and contains thermal and neutronics results applicable to the irradiation test period.
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