Oxygen potentials of (U
,Pu
,Am
)O
solid solutions
None
逢坂 正彦
; 佐藤 勇; 滑川 卓志; 黒崎 健*; 山中 伸介*
Osaka, Masahiko; Sato, Isamu; Namekawa, Takashi; Kurosaki, Ken*; Yamanaka, Shinsuke*
Amを含有するMOX燃料の酸素ポテンシャルを測定した。H
O/H
, CO
/H
気相平衡を用いた熱重量分析により、1123K, 1273K及び1423Kおける酸素ポテンシャルを測定した。測定値をMOX燃料と比べた場合、わずか4.5%のAmであっても酸素ポテンシャルは非常に高いことが分かった。
Oxygen potentials of (U,Pu)O
containing AmO
, (U
Pu
Am
)O
, were measured as functions of the oxygen to metal (O/M) ratios and temperatures by hermogravimetric analysis (TGA) and discussed from thermodynamic viewpoints. The (U
Pu
Am
)O
solid solution was prepared by a traditional powder metallurgical route. Oxygen partial pressure (pO
) was adjusted in the region from 10
to 10
MPa by using CO
/H
and H
O /H
equilibria. Changes of microgram order in the specimen weight were continuously monitored with a TGA apparatus and the dependences of oxygen potentials on the O/M ratios were obtained at 1123K, 1273K and 1423K. The oxygen potentials of (U
Pu
Am
)O
were significantly higher than those in (U
Pu
)O
. The partial molar entropy and enthalpy of oxygen have been calculated and compared with those of Am O
, (Am
U
) O
, and (U
Pu
)O
. Finally, the oxygen potential isotherms of (U
,Pu
,Am
)O
were examined in terms of defect structure.