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Report No.
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Conceptual study for the hollow core of a research reactor

Komeda, Masao  ; Arai, Masaji ; Sagawa, Hisashi; Kusunoki, Tsuyoshi 

We carried out conceptual study of a future research reactor focused on a hollow core. The hollow core satisfied both utilizations of neutron beam and irradiation. It was indicated that the hollow core with 40.8cm-by-40.8cm had higher neutron flux in the D$$_{2}$$O tank by 30% than a square core with 40.8cm-by-40.8cm. The hollow core could achieve almost same flux as a smaller square core with 35.7cm-by-35.7cm. Because there was the peak flux at the furthest point from the core in the D$$_{2}$$O tank in the case of the hollow core, it was able to obtain more neutrons for neutron irradiation utilization. The hollow core had flat and large (20.4cm-by-20.4cm) irradiation area of fast neutron in the central area. There the fast neutron flux was 7.0$$times$$10$$^{14}$$ (n/cm$$^{2}$$/s). There is not a reactor that has such a large irradiation field of fast neutron. Therefore the hollow core is regarded as an attractive research reactor for irradiation field of fast neutron.

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