Effect of Neutron Spectrum on Effective Cross Section in Evaluation of Residual Radioactive Inventory in Nuclear Reactors

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The method of shielding calculations, and production and decay of nuclides being employed for estimate of radioactive inventory frequently assumes the Maxwellian distribution (MD) for thermal neutron spectrum and 1/E for epithermal neutron spectrum. Actually each spectrum deviates largely from the MD and 1/E spectrum respectively in reactor pressure vessel (RPV) and biological shielding concrete (BSC). These assumption then leads activation calculation for residual radioactivity to noticeable error. In this paper it is studied how the deviation of the neutron spectrum affects activation, effective thermal neutron cross section and effective epithermal neutron cross section. It has been proved that they change according to position in the RPV, BSC and other reactor components. Therefore, neutron energy group structure is required to be so fine as to define neutron spectrum accurately.

収録刊行物

  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 35(4), 255-263, 1998-04-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002079226
  • 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
    4462473
  • 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  NDL  J-STAGE 
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