Irradiation Behavior of Large Grain UO_2 Fuel Rod by Active Powder

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The internal pressures in the large and normal grain UO<SUB>2</SUB> pellet rods irradiated at a linear heat rate of <29kW/m up to 21GWd/t U were studied to clarify the effect of in-pile densification and fission gas release. The large grain (grain size: 23μm) pellets were manufactured from the active powder produced by the new ADU (ammonium diuranate) process. The pore structure of the large grain pellets mainly consisted of coarse pores that were formed by adding a poreformer. The pore structure of the normal grain (8μm) pellets made from the current powder consisted of fine pores. In-pile and out-of-pile densification of the large grain pellets were smaller than those of the normal pellets and occurred owing to the disappearance of fine pores as fabricated. The increase in free volume of the large grain fuel rod did not occur significantly owing to its smaller densification during the initial irradiation period. The fuel stack length change during irradiation was predicted with the in-pile densification and swelling model. The increase in grain size decreased fission gas release by diffusion. As a result, it was found that the internal pressure of the large grain fuel rod was reduced after 10GWd/t U.

収録刊行物

  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 35(6), 411-418, 1998-06-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002079539
  • 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
    4503988
  • 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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