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Abe, Hitoshi; Tashiro, Shinsuke; Miyoshi, Yoshinori
Nihon Genshiryoku Gakkai Wabun Rombunshi, 6(1), p.10 - 21, 2007/03
In MOX fuel fabrication facility, zinc stearate will be added into the MOX powder as addition material. If the material is added in large excess by miss operation, criticality characteristics of the MOX fuel would be influenced because it has neutron moderation effect. If criticality condition should be induced by the excess addition, physical variations, such as melting and pyrolysis of the material, must be caused by the fission energy and dynamic characteristics of the MOX fuel must be affected. To contribute quantitative evaluation of the dynamic characteristics, thermal properties data such as exo/endothermic calorific values, reaction rates, etc. with the respective physical variations and release behavior of pyrolysis gas were measured. It was found the exo/endothermic behavior with rinsing temperature of the material could be divided into six regions and rapid pressure rise caused by the pyrolysis reaction over about 400 
C. Furthermore, on the basis of the results, evaluation model for the thermal properties under the criticality condition was also investigated.
*; Watanabe, Ryuzo*
PNC TJ9601 93-004, 68 Pages, 1993/03
Molybdenum/stainless steel functionally gradient material (FGM). which will be used as long life fuel cladding tubes in the fast breeder reactor, has been fabricated by slurry dipping and sintering process emphasizing the increase in unti-corrosion against liquid sodium and fission products. Slurries of different compositions were prepared by mixing the appropriate amount of molybdenum and stainless steel powders in the ethanol. Green compacts giving cylindrical shape, substrates. were formed by die pressing of stainless steel powders. The substrates were dipped in the slurry, dried in the air and CIP'ed stepwizely: they were encapsulated in Pyrex glass tubes and then HIP'ed 2h at 1573K at the pressure of 150MPa. The microstructural observation in the cross section of the sintered compacts revealed that the uniform dipped layer was formed and there was no defect such as large residual pores or small cracks. A defect free Mo/stainless steel FGM was successfully fabricated by the slurry dipping and sintering process, however, in the case of single phase coating of Mo layer on the stainless steel substrate, the serious delamination was observed. Some oxides and compounds were detected in the FGM layer by the use of SEM-EDX and EPMA analysis.
;
JAERI-M 8706, 20 Pages, 1980/02
no abstracts in English
; *;
Nihon Genshiryoku Gakkai-Shi, 13(5), p.259 - 266, 1971/00
no abstracts in English
Ogawa, Arata*; Ono, Shinya*; Yoshigoe, Akitaka
no journal, ,
Graphene is an attracting material for future electronic devices. In this conference, we report the study on the analysis of thermal stability of graphene thin layers on silicon oxide films. Photoemission experiments of CVD graphene grown on oxidized silicon substrates using surface chemistry apparatus at BL23SU in SPring-8 were conducted to measure C1s, O1s and Si2p. Temperature dependence of graphene structures was observed to suggest attached graphene monolayer at room temperature, whereas floated graphene monolayer seems to be formed when the substrate temperature increases.
Watanabe, Miku*; Miyamoto, Goro*; Morooka, Satoshi; Furuhara, Tadashi*
no journal, ,
no abstracts in English
