^<11>B_4Cの中性子照射効果とその回復挙動

概要

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Use of moderator materials in a fast breeder reactor is effective for transmutation technology, and ^<11>B_4C is one of the candidates. Up to now, the behavior of ^<10>B_4C as the control rod material is well known, but that of ^<11>B_4C has hardly been investigated. In this paper, irradiation effects of ^<11>B_4C pellet irradiated in the experimental fast reactor JOYO were studied. From the experimental results, it was observed that no macro-cracks were recognized but bubble nucleation was found in the grain and along the grain boundaries of ^<11>B_4C. Furthermore, it was shown that the thermal conductivity of ^<11>B_4C was higher than that of ^<10>B_4C. During the annealing from room temperature to 1400℃, two recovery stages were found on thermal conductivity. It was suggested that the recovery of B_4C was related to the volume and distribution of helium bubbles. Since the nB4C pellet was mechanically more stable compared with the ^<10>B_4C pellet under irradiation, it was shown that ^<11>B_4C had high applicability for a moderator material.
社団法人日本セラミックス協会の論文
2007-09-01