Radiotoxicity

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Hiroshi Sekimoto - One of the best experts on this subject based on the ideXlab platform.

  • Radiotoxicity hazard of inert matrix fuels after burning minor actinides in light water reactors
    Progress in Nuclear Energy, 2001
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract Ingestion Radiotoxicity hazard index of inert matrix spent fuels are investigated after burning minor actinide (MA) isotopes in LWRs and compared with the hazard index of MOX and MA burning MOX (MOX+MA) spent fuels. As U-free fuels, ROX: (PuO 2 +ZrO 2 ) and TOX: (PuO 2 +ThO 2 ), are considered, in which MA's are added as oxides. The Radiotoxicity hazard index of ROX+MA spent fuel is less than that of TOX+MA and MOX+MA spent fuels due to the lower density of actinides in spent fuel. Some of cooling years the toxic yield of ROX+MA spent fuel is even less than that of MOX spent fuel, if the initial loaded MA in ROX is about 0.5 at %.

  • Radiotoxicity hazard of u free puo2 zro2 and puo2 tho2 spent fuels in lwr
    Progress in Nuclear Energy, 2000
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract The Radiotoxicity hazard of U-free Rock-like oxide: ROX (PuO 2 +ZrO 2 ) and Thorium oxide: TOX (PuO 2 +ThO 2 ) LWR spent fuels is investigated and Radiotoxicity hazard of MOX spent fuel is considered as a reference case. The long-term ingestion Radiotoxicity hazard of ROX spent fuel is one third and nearly one fourth of that of TOX and MOX spent fuels, respectively. This is because the discharged Pu and long lived Np in ROX fuel is less than that of TOX and MOX fuels. In TOX fuel, discharged Pu and MA are lower than that of MOX fuel but the long-term Radiotoxicity hazard of spent fuel is nearly the same as MOX spent fuel. At the cooling 10 5 years, the Radiotoxicity hazard of TOX spent fuel is approximately ten and three times higher than that of ROX and MOX spent fuels, respectively due to higher toxic contribution of 229 Th in TOX spent fuel.

  • Radiotoxicity hazard of U-free PuO2+ZrO2 and PuO2+ThO2 spent fuels in LWR
    Progress in Nuclear Energy, 2000
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract The Radiotoxicity hazard of U-free Rock-like oxide: ROX (PuO 2 +ZrO 2 ) and Thorium oxide: TOX (PuO 2 +ThO 2 ) LWR spent fuels is investigated and Radiotoxicity hazard of MOX spent fuel is considered as a reference case. The long-term ingestion Radiotoxicity hazard of ROX spent fuel is one third and nearly one fourth of that of TOX and MOX spent fuels, respectively. This is because the discharged Pu and long lived Np in ROX fuel is less than that of TOX and MOX fuels. In TOX fuel, discharged Pu and MA are lower than that of MOX fuel but the long-term Radiotoxicity hazard of spent fuel is nearly the same as MOX spent fuel. At the cooling 10 5 years, the Radiotoxicity hazard of TOX spent fuel is approximately ten and three times higher than that of ROX and MOX spent fuels, respectively due to higher toxic contribution of 229 Th in TOX spent fuel.

  • Effect of decontamination factor of recycled actinide and FP on the characteristics of SCNES
    Progress in Nuclear Energy, 1998
    Co-Authors: Naoyuki Takaki, Ryuzo Takagi, Hiroshi Sekimoto
    Abstract:

    Abstract Effect of the decontamination factor (DF) of nuclides to be confined in the closed fuel cycle was examined in terms of the system characteristics. Two kinds of indices, equilibrium mass and equivalent Radiotoxicity, were used to determine the recovery perfectivity of the nuclides. By using the equilibrium mass, extremely high DF had to be attained. The required values of DF were 10 8 for LLFP and 10 12 for actinides. On the other hand, using the Radiotoxicity, inferior perfectivity of recovery, DF=10 6 , could be acceptable for actinides and there is no necessity of LLFP recycling for transmutation because they only have comparable Radiotoxicity with the supplied uranium to the system. The required DF which provide ignorable loss of waste to the outside of the system depends on what index we use. Generalization of index to quantify the hazard or nuisance of nuclear waste and setting the criteria remains unsettled questions.

Afroza Shelley - One of the best experts on this subject based on the ideXlab platform.

  • Radiotoxicity hazard of inert matrix fuels after burning minor actinides in light water reactors
    Progress in Nuclear Energy, 2001
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract Ingestion Radiotoxicity hazard index of inert matrix spent fuels are investigated after burning minor actinide (MA) isotopes in LWRs and compared with the hazard index of MOX and MA burning MOX (MOX+MA) spent fuels. As U-free fuels, ROX: (PuO 2 +ZrO 2 ) and TOX: (PuO 2 +ThO 2 ), are considered, in which MA's are added as oxides. The Radiotoxicity hazard index of ROX+MA spent fuel is less than that of TOX+MA and MOX+MA spent fuels due to the lower density of actinides in spent fuel. Some of cooling years the toxic yield of ROX+MA spent fuel is even less than that of MOX spent fuel, if the initial loaded MA in ROX is about 0.5 at %.

  • Radiotoxicity hazard of U-free PuO2+ZrO2 and PuO2+ThO2 spent fuels in LWR
    Progress in Nuclear Energy, 2000
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract The Radiotoxicity hazard of U-free Rock-like oxide: ROX (PuO 2 +ZrO 2 ) and Thorium oxide: TOX (PuO 2 +ThO 2 ) LWR spent fuels is investigated and Radiotoxicity hazard of MOX spent fuel is considered as a reference case. The long-term ingestion Radiotoxicity hazard of ROX spent fuel is one third and nearly one fourth of that of TOX and MOX spent fuels, respectively. This is because the discharged Pu and long lived Np in ROX fuel is less than that of TOX and MOX fuels. In TOX fuel, discharged Pu and MA are lower than that of MOX fuel but the long-term Radiotoxicity hazard of spent fuel is nearly the same as MOX spent fuel. At the cooling 10 5 years, the Radiotoxicity hazard of TOX spent fuel is approximately ten and three times higher than that of ROX and MOX spent fuels, respectively due to higher toxic contribution of 229 Th in TOX spent fuel.

  • Radiotoxicity hazard of u free puo2 zro2 and puo2 tho2 spent fuels in lwr
    Progress in Nuclear Energy, 2000
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract The Radiotoxicity hazard of U-free Rock-like oxide: ROX (PuO 2 +ZrO 2 ) and Thorium oxide: TOX (PuO 2 +ThO 2 ) LWR spent fuels is investigated and Radiotoxicity hazard of MOX spent fuel is considered as a reference case. The long-term ingestion Radiotoxicity hazard of ROX spent fuel is one third and nearly one fourth of that of TOX and MOX spent fuels, respectively. This is because the discharged Pu and long lived Np in ROX fuel is less than that of TOX and MOX fuels. In TOX fuel, discharged Pu and MA are lower than that of MOX fuel but the long-term Radiotoxicity hazard of spent fuel is nearly the same as MOX spent fuel. At the cooling 10 5 years, the Radiotoxicity hazard of TOX spent fuel is approximately ten and three times higher than that of ROX and MOX spent fuels, respectively due to higher toxic contribution of 229 Th in TOX spent fuel.

Hiroshi Akie - One of the best experts on this subject based on the ideXlab platform.

  • Radiotoxicity hazard of inert matrix fuels after burning minor actinides in light water reactors
    Progress in Nuclear Energy, 2001
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract Ingestion Radiotoxicity hazard index of inert matrix spent fuels are investigated after burning minor actinide (MA) isotopes in LWRs and compared with the hazard index of MOX and MA burning MOX (MOX+MA) spent fuels. As U-free fuels, ROX: (PuO 2 +ZrO 2 ) and TOX: (PuO 2 +ThO 2 ), are considered, in which MA's are added as oxides. The Radiotoxicity hazard index of ROX+MA spent fuel is less than that of TOX+MA and MOX+MA spent fuels due to the lower density of actinides in spent fuel. Some of cooling years the toxic yield of ROX+MA spent fuel is even less than that of MOX spent fuel, if the initial loaded MA in ROX is about 0.5 at %.

  • Radiotoxicity hazard of U-free PuO2+ZrO2 and PuO2+ThO2 spent fuels in LWR
    Progress in Nuclear Energy, 2000
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract The Radiotoxicity hazard of U-free Rock-like oxide: ROX (PuO 2 +ZrO 2 ) and Thorium oxide: TOX (PuO 2 +ThO 2 ) LWR spent fuels is investigated and Radiotoxicity hazard of MOX spent fuel is considered as a reference case. The long-term ingestion Radiotoxicity hazard of ROX spent fuel is one third and nearly one fourth of that of TOX and MOX spent fuels, respectively. This is because the discharged Pu and long lived Np in ROX fuel is less than that of TOX and MOX fuels. In TOX fuel, discharged Pu and MA are lower than that of MOX fuel but the long-term Radiotoxicity hazard of spent fuel is nearly the same as MOX spent fuel. At the cooling 10 5 years, the Radiotoxicity hazard of TOX spent fuel is approximately ten and three times higher than that of ROX and MOX spent fuels, respectively due to higher toxic contribution of 229 Th in TOX spent fuel.

  • Radiotoxicity hazard of u free puo2 zro2 and puo2 tho2 spent fuels in lwr
    Progress in Nuclear Energy, 2000
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract The Radiotoxicity hazard of U-free Rock-like oxide: ROX (PuO 2 +ZrO 2 ) and Thorium oxide: TOX (PuO 2 +ThO 2 ) LWR spent fuels is investigated and Radiotoxicity hazard of MOX spent fuel is considered as a reference case. The long-term ingestion Radiotoxicity hazard of ROX spent fuel is one third and nearly one fourth of that of TOX and MOX spent fuels, respectively. This is because the discharged Pu and long lived Np in ROX fuel is less than that of TOX and MOX fuels. In TOX fuel, discharged Pu and MA are lower than that of MOX fuel but the long-term Radiotoxicity hazard of spent fuel is nearly the same as MOX spent fuel. At the cooling 10 5 years, the Radiotoxicity hazard of TOX spent fuel is approximately ten and three times higher than that of ROX and MOX spent fuels, respectively due to higher toxic contribution of 229 Th in TOX spent fuel.

Hideki Takano - One of the best experts on this subject based on the ideXlab platform.

  • Radiotoxicity hazard of inert matrix fuels after burning minor actinides in light water reactors
    Progress in Nuclear Energy, 2001
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract Ingestion Radiotoxicity hazard index of inert matrix spent fuels are investigated after burning minor actinide (MA) isotopes in LWRs and compared with the hazard index of MOX and MA burning MOX (MOX+MA) spent fuels. As U-free fuels, ROX: (PuO 2 +ZrO 2 ) and TOX: (PuO 2 +ThO 2 ), are considered, in which MA's are added as oxides. The Radiotoxicity hazard index of ROX+MA spent fuel is less than that of TOX+MA and MOX+MA spent fuels due to the lower density of actinides in spent fuel. Some of cooling years the toxic yield of ROX+MA spent fuel is even less than that of MOX spent fuel, if the initial loaded MA in ROX is about 0.5 at %.

  • Radiotoxicity hazard of U-free PuO2+ZrO2 and PuO2+ThO2 spent fuels in LWR
    Progress in Nuclear Energy, 2000
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract The Radiotoxicity hazard of U-free Rock-like oxide: ROX (PuO 2 +ZrO 2 ) and Thorium oxide: TOX (PuO 2 +ThO 2 ) LWR spent fuels is investigated and Radiotoxicity hazard of MOX spent fuel is considered as a reference case. The long-term ingestion Radiotoxicity hazard of ROX spent fuel is one third and nearly one fourth of that of TOX and MOX spent fuels, respectively. This is because the discharged Pu and long lived Np in ROX fuel is less than that of TOX and MOX fuels. In TOX fuel, discharged Pu and MA are lower than that of MOX fuel but the long-term Radiotoxicity hazard of spent fuel is nearly the same as MOX spent fuel. At the cooling 10 5 years, the Radiotoxicity hazard of TOX spent fuel is approximately ten and three times higher than that of ROX and MOX spent fuels, respectively due to higher toxic contribution of 229 Th in TOX spent fuel.

  • Radiotoxicity hazard of u free puo2 zro2 and puo2 tho2 spent fuels in lwr
    Progress in Nuclear Energy, 2000
    Co-Authors: Afroza Shelley, Hiroshi Akie, Hideki Takano, Hiroshi Sekimoto
    Abstract:

    Abstract The Radiotoxicity hazard of U-free Rock-like oxide: ROX (PuO 2 +ZrO 2 ) and Thorium oxide: TOX (PuO 2 +ThO 2 ) LWR spent fuels is investigated and Radiotoxicity hazard of MOX spent fuel is considered as a reference case. The long-term ingestion Radiotoxicity hazard of ROX spent fuel is one third and nearly one fourth of that of TOX and MOX spent fuels, respectively. This is because the discharged Pu and long lived Np in ROX fuel is less than that of TOX and MOX fuels. In TOX fuel, discharged Pu and MA are lower than that of MOX fuel but the long-term Radiotoxicity hazard of spent fuel is nearly the same as MOX spent fuel. At the cooling 10 5 years, the Radiotoxicity hazard of TOX spent fuel is approximately ten and three times higher than that of ROX and MOX spent fuels, respectively due to higher toxic contribution of 229 Th in TOX spent fuel.

G. V. Tikhomirov - One of the best experts on this subject based on the ideXlab platform.