Survey of Estimation Methods for Radioactive Inventory in Nuclear Reactors to be Decommissioned

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In the nuclear reactors to be decommissioned, radioactive inventories due to neutron activation are calculated using application codes and cross section libraries. Some of them are evaluated through benchmark tests. This review surveys the present situation and problems of the calculation methods together with the measurements on radioactive inventories and chemical composition analyses of reactor components.<BR>The ANISN and DOT calculations are almost carried out from 100 to 30 and from 26 to 5 neutron energy groups, respectively for the activation calculation, which is widely implemented using ORIGEN and other codes for activation calculation. The calculation models and the physical quantities for the calculation are employed variously and neutron spectrum does not always correspond properly between the codes. A lot of neutron streams from penetrating holes in the biological shielding concrete (BSC) build up neutron fluxes in the BSC, and a difference between the calculations and measurements of radioactive inventories tends to grow with distance into the BSC. These factors at least require a three-dimensional calculation and measurements in order to enhance and confirm calculation accuracy.

収録刊行物

  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 35(5), 379-391, 1998-05-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002079478
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    REV
  • ISSN
    00223131
  • NDL 記事登録ID
    4474211
  • 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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