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*; *; Yato, Tadao*; *; *
PNC TJ9211 89-001, 75 Pages, 1989/03
Out-of-pile tests were performed to study the compatibility between BC pellet and cladding material in the sodium bonding BC absorber pin. No harmful change is observed in BC pellet except with a little change in the suface colour after heating at 650C for 5,000 hours. The reaction between cladding material and BC pellet is negligible at the temperature below 550C. The Cr, C, B-rich and Ni-deficient reaction layer is formed at 650C. The thickness of this reaction layer increases with heating time and reaches about 40m after 5,000 hours. The microstructure of cladding changes by annealing and a precipitation of (Cr, Mo)C is observed in the inner part of cladding. In three candidate cladding materials, the reaction behaviors of advanced SUS316 steel and high strength ferite/martensite steel are almost same as that of cladding material. Formation of surface reaction layer and microstructure change are observed little in advanced austenite steel. Ni cannot be expected as the barrier materiale because of the penetration of B and C, Cr, Nb and Ti can be expected as the barrier materiale.
Yato, Tadao*; Yamaguchi, Toshihiro; Nagai, Shuichiro; Kaneko, Hiromitsu
PNC TN841 82-14, 31 Pages, 1982/02
no abstracts in English
Honda, Yutaka*; Yato, Tadao*; Konashi, Kenji; *; *; Kaneko, Hiromitsu
PNC TN841 81-30, 62 Pages, 1981/03
no abstracts in English
Honda, Yutaka*; Yato, Tadao*; Konashi, Kenji; Kaneko, Hiromitsu
PNC TN842 80-01, 91 Pages, 1980/01
Temperature and oxygen potemtial are the most important factors in determining chemical states within fuel pins. Oxygen potential at the fuel surface is about-100 kcal/mol in the typical LMFBR fuels. Cs (U, Pu)O is produced by reaction of cesium with the fuel. Cesium migrates, axially to the blanket and CsUO is formed by reaction of ceisum with the blanket UO, It is possible that CsCrO (x=3, 4) and/or CsOH are produced at the cladding inner surface, and these compounds are especially important with regard to cladding corrosion. Cladding components iodides MI (M=Fe, Cr, Ni) and tellurides MTe are important in a viewpoint of mass transport of cladding components. For the mechanism of FCCI, some models which are currently reported are reviewed. The models are for intergranular attack by CsOH, Cs-Te and Cs, and for cladding component mass transport by I and Cs-Te.
Honda, Yutaka*; Kaneko, Hiromitsu; Tachibana, Toshimichi; Yamaguchi, Toshihiro; Yato, Tadao*; *; Konashi, Kenji
PNC TN841 79-15, 396 Pages, 1979/03
no abstracts in English
Miura, Makoto; Honda, Yutaka*; Omori, Takuro; Kaneko, Hiromitsu; ; Yato, Tadao*; Tanaka, Yasumasa; Konashi, Kenji
PNC TN841 79-11, 118 Pages, 1979/02
no abstracts in English
Uchida, Teppei; Kato, Masato; Konashi, Kenji*; Yato, Tadao*; Sakurahara, Tatsuya*; Tanaka, Satoru*
no journal, ,
no abstracts in English
Watanabe, Masashi; Kato, Masato; Sunaoshi, Takeo*; Yato, Tadao*; Konashi, Kenji*
no journal, ,
Raman spectroscopy has been used to detect the oxygen vacancies and proven to be a very powerful characterization technique. Recently, Raman spectra were measured for UO, but the Raman spectral data of hypo-stoichiometric actinide oxides are limited. The present work demonstrated that the Raman microscopy could successfully be used to detect the Raman spectra of non-stoichiometric (U, Ce)O.
Watanabe, Masashi; Kato, Masato; Sunaoshi, Takeo*; Yato, Tadao*; Konashi, Kenji*
no journal, ,
Raman spectroscopy has been widely used to detect the oxygen vacancies and proven to be a very powerful characterization technique. The Raman spectral data of non-stoichiometric actinide oxides are very limited. The purpose of this work was to measure the Raman spectra of a non-stoichiometric (UCe)O solid solution. The Raman spectra of stoichiometric and non-stoichiometric (UCe)O are successfully measured. The T peak of non-stoichiometric (UCe)O exhibited the same peak shift behavior as hypo-stoichiometric CeO.
Katano, Tomohito*; Tachibana, Yu*; Suzuki, Tatsuya*; Konashi, Kenji*; Yato, Tadao*; Homma, Yoshiya*; Kitagaki, Toru
no journal, ,
no abstracts in English