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JAEA Reports

Out-of-pile tests of the compatibility between B $_{4}$ C pellet and cladding material in a sodium environment (II)

; ; Yato, Tadao*; ;

PNC TJ9211 89-001, 75 Pages, 1989/03

Out-of-pile tests were performed to study the compatibility between B $_{4}$ C pellet and cladding material in the sodium bonding B $_{4}$ C absorber pin. No harmful change is observed in B $_{4}$ C pellet except with a little change in the suface colour after heating at 650 $^{circ}$ C for 5,000 hours. The reaction between cladding material and B $_{4}$ C pellet is negligible at the temperature below 550 $^{circ}$ C. The Cr, C, B-rich and Ni-deficient reaction layer is formed at 650 $^{circ}$ C. 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) $_{23}$ C $_{6}$ 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.

JAEA Reports

Densification and structure change of (U, Pu)O $_{2}$ fuel by resintering experiments at 1700 $^{circ}$ C

Yato, Tadao*; Yamaguchi, Toshihiro; Nagai, Shuichiro; Kaneko, Hiromitsu

PNC TN841 82-14, 31 Pages, 1982/02

PNC-TN841-82-14.pdf:2.6MB

no abstracts in English

JAEA Reports

None

Honda, Yutaka*; Yato, Tadao*; Konashi, Kenji; ; ; Kaneko, Hiromitsu

PNC TN841 81-30, 62 Pages, 1981/03

PNC-TN841-81-30.pdf:6.93MB

no abstracts in English

JAEA Reports

Review of FCCI (fuel-cladding chemical interaction) in LMFBR fuel pins (I); Chemistry in fuel pins and mechanism of FCCI

Honda, Yutaka*; Yato, Tadao*; Konashi, Kenji; Kaneko, Hiromitsu

PNC TN842 80-01, 91 Pages, 1980/01

PNC-TN842-80-01.pdf:2.28MB

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 $_{2}$ (U, Pu)O $_{4}$ is produced by reaction of cesium with the fuel. Cesium migrates, axially to the blanket and Cs $_{2}$ UO $_{4}$ is formed by reaction of ceisum with the blanket UO $_{2}$ , It is possible that Cs $_{x}$ CrO $_{4}$ (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 $_{2}$ (M=Fe, Cr, Ni) and tellurides MTe $_{n}$ 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.

JAEA Reports

None

Honda, Yutaka*; Kaneko, Hiromitsu; Tachibana, Toshimichi; Yamaguchi, Toshihiro; Yato, Tadao*; ; Konashi, Kenji

PNC TN841 79-15, 396 Pages, 1979/03

PNC-TN841-79-15.pdf:8.11MB

no abstracts in English

JAEA Reports

Examination of Compatibility between Fuel and Ciadding-4; Internal Creep Rupture Strength of Fast Breeder Reactor Fuel Pins after lntergranular Attack

Miura, Makoto; Honda, Yutaka*; Omori, Takuro; Kaneko, Hiromitsu; ; Yato, Tadao*; Tanaka, Yasumasa; Konashi, Kenji

PNC TN841 79-11, 118 Pages, 1979/02

PNC-TN841-79-11.pdf:10.71MB

no abstracts in English

Oral presentation

Chemical conversion of uranium dioxide pellet into easily soluble compounds by using thermochemical reaction in gas phase

Katano, Tomohito*; Tachibana, Yu*; Suzuki, Tatsuya*; Konashi, Kenji*; Yato, Tadao*; Homma, Yoshiya*; Kitagaki, Toru

no journal, ,

no abstracts in English

Oral presentation

Raman spectroscopy of (U, Ce)O $_{2-x}$

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 $_{2+x}$ , 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 $_{2}$ .

Oral presentation

Study of Raman spectroscopy for defect structure of non-stoichiometric oxide high temperature measurement of CeO $_{2-x}$

Uchida, Teppei; Kato, Masato; Konashi, Kenji*; Yato, Tadao*; Sakurahara, Tatsuya*; Tanaka, Satoru*

no journal, ,

no abstracts in English

Oral presentation

Raman spectra of non-stoichiometric (U $_{1-y}$ Ce $_{y}$ )O $_{2}$ solid solution

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 (U $_{1-y}$ Ce $_{y}$ )O $_{2}$ solid solution. The Raman spectra of stoichiometric and non-stoichiometric (U $_{1-y}$ Ce $_{y}$ )O $_{2}$ are successfully measured. The T $_{2g}$ peak of non-stoichiometric (U $_{1-y}$ Ce $_{y}$ )O $_{2}$ exhibited the same peak shift behavior as hypo-stoichiometric CeO $_{2}$ .

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Out-of-pile tests of the compatibility between B $_{4}$ C pellet and cladding material in a sodium environment (II)

Densification and structure change of (U, Pu)O $_{2}$ fuel by resintering experiments at 1700 $^{circ}$ C

None

Review of FCCI (fuel-cladding chemical interaction) in LMFBR fuel pins (I); Chemistry in fuel pins and mechanism of FCCI

None

Examination of Compatibility between Fuel and Ciadding-4; Internal Creep Rupture Strength of Fast Breeder Reactor Fuel Pins after lntergranular Attack

Chemical conversion of uranium dioxide pellet into easily soluble compounds by using thermochemical reaction in gas phase

Raman spectroscopy of (U, Ce)O $_{2-x}$

Study of Raman spectroscopy for defect structure of non-stoichiometric oxide high temperature measurement of CeO $_{2-x}$

Raman spectra of non-stoichiometric (U $_{1-y}$ Ce $_{y}$ )O $_{2}$ solid solution