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Takeda, Toshikazu*; Usami, Shin; Fujimura, Koji*; Takakuwa, Masayuki*
Proceedings of 21st International Conference & Exhibition; Nuclear Fuel Cycle for a Low-Carbon Future (GLOBAL 2015) (USB Flash Drive), p.560 - 566, 2015/09
The Ministry of Education, Culture, Sports, Science and Technology in Japan has launched a national project entitled "technology development for the environmental burden reduction" in 2013. The present study is one of the studies adopted as the national project. The objective of the study is the efficient and safe transmutation and volume reduction of minor actinides with long-lived radioactivity and high decay heat contained in high level radioactive wastes by using sodium cooled fast reactors. We are developing MA transmutation core concepts which harmonize efficient MA transmutation with core safety. To accurately design the core concepts we have improved calculation methods for estimating the transmutation rate of individual MA nuclides, and estimating and reducing uncertainty of MA transmutation. The overview of the present project is first described. The method improvement is presented with numerical results for a minor-actinide transmutation fast reactor.
Takakuwa, Yuji*; Ogawa, Shuichi*; Ohira, Masayuki*; Ishizuka, Shinji*; Yoshigoe, Akitaka; Teraoka, Yuden; Mizuno, Yoshiyuki*; Yamauchi, Yasuhiro*; Homma, Teiichi*
no journal, ,
Oxidation processes of Ti(0001)-1
1 clean surface were analyzed by real-time monitoring using a variety of surface analysis methods of XPS, UPS, and AES/RHEED. Following conclusions were obtained by these observations. Oxide layer grows epitaxially at the Ti(0001) surface with a 
structure. Surface roughness changes periodically. The period is consistent with that of work function. Low oxidation state (TiO) plays a dominant role in the dissociative adsorption of oxygen molecules. The oxide layer decomposes easily at surface temperature over 673 K. The TiO
structure reduces to TiO during thermal decomposition.
Hazama, Taira; Takeda, Toshikazu*; Kitada, Takanori*; Sano, Tadafumi*; Takakuwa, Masayuki*
no journal, ,
no abstracts in English