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Fujino, Takeo*; Sato, Nobuaki*; Yamada, Kota*; Okazaki, Manabu*; Fukuda, Kosaku; Serizawa, Hiroyuki; Shiratori, Tetsuo*
Journal of Nuclear Materials, 289(3), p.270 - 280, 2001/03
Times Cited Count：2 Percentile：19.6(Materials Science, Multidisciplinary)no abstracts in English
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JAERI-M 87-023, 10 Pages, 1987/02
no abstracts in English
Hayashi, Hirokazu; Sato, Takumi
no journal, ,
Transmutation of long-lived radioactive nuclides including minor actinides (MA: Np, Am, Cm) is effective to reduce the burden of high level radioactive wastes and using repositories efficiently. Uranium-free nitride fuel has been chosen as the first candidate fuel for MA transmutation using accelerator-driven system (ADS) in Japan Atomic Energy Agency (JAEA) under the double strata fuel cycle concept. To improve the transmutation ratio of MA, reprocessing of spent MA fuel and reusing the recovered MA is necessary. Our target is to transmute 99% of MA arisen from commercial power reactor fuel cycle, with which the period until the radiotoxicity drops below that of natural uranium can be shorten from about 5000 years to about 300 years. Each reprocessing process is required to recover 99.9% of MA to meet the target. Typical composition of the solid solution type (MA,Pu,Zr)N fuel is considered as 30 wt.% of MA nitride, 20 wt.% of Pu nitride, and 50 wt.% of ZrN (dilution material to adjust the power density). Pyroprocessing has been proposed to adopt for reprocessing of the spent MA nitride fuel. This paper summarizes the status of our study on pyroprocessing of ZrN-based nitride fuels.
Hayashi, Hirokazu; Sato, Takumi; Tateno, Haruka*; Akashi, Shin*; Shibata, Hiroki; Tsubata, Yasuhiro
no journal, ,
Japan Atomic Energy Agency (JAEA) has been developing the technology on transmutation of MA under the double strata fuel cycle concept. A combination of uranium-free Pu-MA-Zr nitride fuel and pyroprocessing has been chosen as the first candidate for MA transmutation fuel cycle using accelerator-driven system (ADS). This paper introduces the recent progress ondevelopment of pyroprocessing technology for MA transmutation nitride fuels. It contains a detailed design of the flowsheet on the electrorefining process of the spent fuels and the behavior of metal elements in renitridation process.
