Measurement and evaluation on pulsing characteristics and experimental capability of NSRR.

概要

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The NSRR programme is in progress in JAERI using a pulsed reactor to investigate fuel behaviors under the reactivity-initiated accident conditions. Pulsing characteristics and experimental capability, especially heat deposition in test fuel rods given by a single pulse are key parameters to this purpose. In pulsing performance tests, it has been ascertained that the maximum pulsing with 4.67 $ (=3.41%Δk) brings peak reactor power of 21, 100 MW and core energy release of 117 MW -sec. The calculated time responses of reactor power, fuel temperature and cladding surface temperature as well as these maximum values at various pulse sizes agreed well with measured data. In addition, it has been also ascertained by measure-ment as well as analysis that there are no essential differences in pulsing characteristics between the pulsing from critical and that from subcritical. The heat deposition in a test fuel rod given by a single pulse is much enough as predicted, and a 2.6% enriched BWR type fuel rod gains about 230 cal/g•UO2 in the maximum pulsing. In case of irradiation of clustered five test fuel rods by a single pulse, heat deposition reduces by about 20% for a surrounding rod and about 40% for a center rod in comparison with that in a single rod irradiation.
一般社団法人日本原子力学会の論文