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$$^{11}$$B$$_{4}$$Cの中性子照射効果とその回復挙動

Neutron irradiation effects on $$^{11}$$B$$_{4}$$C and recovery by annealing

堂野前 貴子 ; 舘 義昭  ; 関根 学*; 諸橋 裕子 ; 赤坂 尚昭; 小野瀬 庄二 

Donomae, Takako; Tachi, Yoshiaki; Sekine, Manabu*; Morohashi, Yuko; Akasaka, Naoaki; Onose, Shoji

高速炉で効率的に核分裂生成物を核変換するためには減速材の利用が有効であり、$$^{11}$$B$$_{4}$$Cはその候補の1つとされているが、$$^{11}$$B$$_{4}$$Cの照射挙動は制御材用の$$^{10}$$B$$_{4}$$Cと異なりほとんどデータが得られていない。そこで本論文では、高速炉で照射した$$^{11}$$B$$_{4}$$Cペレットの外観・微細組織観察及び熱伝導率測定を行い、$$^{11}$$B$$_{4}$$Cの照射挙動を明らかにした。照射$$^{11}$$B$$_{4}$$Cの外観は$$^{10}$$B$$_{4}$$Cと異なり、クラックは観察されなかったが、微細組織には$$^{10}$$B$$_{4}$$Cと同様に粒内及び粒界にバブルが確認された。$$^{11}$$B$$_{4}$$Cの熱伝導率は$$^{10}$$B$$_{4}$$Cよりも大きく、室温から1400$$^{circ}$$Cの間には、$$^{10}$$B$$_{4}$$Cと同様に3つの回復ステージが観察され、B$$_{4}$$Cの回復とヘリウムの分散挙動の関連性が示された。以上から、$$^{11}$$B$$_{4}$$Cペレットは照射下での安定性が高いことが確認され、減速材適用の可能性が示された。

Use of moderator materials in Fast Breeder Reactor (FBR) is effective for transmutation technology, and $$^{11}$$B$$_{4}$$C is one of the candidates. Up to now, the behavior of $$^{10}$$B$$_{4}$$C as the Control rod material is well known, but that of $$^{11}$$B$$_{4}$$C is hardly investigated. In this paper, the radiation effects of $$^{11}$$B$$_{4}$$C pellets, neutron irradiated in the experimental fast reactor JOYO were studied. From the experimental results, it was observed that no macro-cracks were recognized in the irradiated $$^{11}$$B$$_{4}$$C pellets. But, bubble nucleation was found in grain and along grain boundaries of $$^{11}$$B$$_{4}$$C. And, it was shown that the conductivity of $$^{11}$$B$$_{4}$$C was higher than that of $$^{10}$$B$$_{4}$$C. During the annealing from room temperature to 1400$$^{circ}$$C, three recovery stages were found on thermal conductivity. It was suggested that, the recovery of B$$_{4}$$C was related to the dispersion behavior of helium. Judging from these results, as $$^{11}$$B$$_{4}$$C was mechanically more stable compared with $$^{10}$$B$$_{4}$$C under irradiation, it was shown that $$^{11}$$B$$_{4}$$C had high applicability for a moderator.

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パーセンタイル:30.7

分野:Materials Science, Ceramics

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