Effect of Fast Neutron Irradiation on the Properties of Boron Carbide Pellet

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Boron carbide pellets were irradiated in the experimental fast reactor "JOYO" to <SUP>10</SUP>B burnup of up to 170×10<SUP>26</SUP>cap/m<SUP>3</SUP>, fluences of 2×10<SUP>26</SUP>/m<SUP>2</SUP> (E>0.1MeV), and maximum temperatures of about 1, 200°C. Post irradiation examinations were made of microstructural changes, helium release, swelling, and thermal conductivity. <BR>Boron carbide pellets irradiated to high burnups developed extensive cracking. Helium release from the pellets was initially low, but enhanced helium release was observed at high burnups and high temperatures. The swelling linearly increased with burnup, and when boron carbide was irradiated at high temperatures, the swelling rate began to decrease corresponding to the beginning of enhanced helium release. The correlation between swelling and the helium release was studied and the swelling was interpreted in terms of accumulation of helium in the boron carbide pellet. The thermal conductivity of the boron carbide pellets decreased rapidly by neutron irradiation accompanied with loss of temperature dependence.

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  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 34(10), 1006-1014, 1997-10-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002078314
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4326335
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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