Thermodynamic Modeling of Plutonium Oxide Containing Americium
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1043-T09-05
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Thermodynamic Modeling of Plutonium Oxide Containing Americium _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
© 2008 Materials Society MasayukiResearch HIROTAa, Ken KUROSAKIb, Masayoshi UNOb, Shuhei MIWAc, Masahiko OSAKAc, Kenya TANAKAc, and Shinsuke YAMANAKAb a
College of Industrial Technology b Graduate School of Engineering, Osaka University c Japan Atomic Energy Agency
JAPAN
Introduction For practicable use of Fast Breeder Reactor (FBR)
©
nt a t r o Imp ect !!! j Establishment b u s 2008 Materials Research Society of transuranium (TRU) recycling system
The answer is … Utilization of plutonium as a mixed oxide fuel (MOX: PuO2 + UO2)
Plutonium plays an important role as an energy resource, too.
In JAPAN Japan Atomic Energy Agency (JAEA) is furthering development of MOX fuel. JAEA is particularly planning the utilization of the MA-containing MOX fuel such as O-Pu-U-Np, O-Pu-U-Am. When developing such MOX fuel containing MA, © 2008 Materials Society basic physical properties Research and sintering characters are very important for fuel design and fabrication.
However… There are few information concerning MA-containing MOX fuel.
So…
In the present study To obtain phase diagram and thermodynamic data for such quaternary systems, as a preliminary stage, thermodynamic modeling was carried out for the various systems.
© 2008 Materials Research Society
The interaction parameters of the excess Gibbs energies of the fluorite structure FCC_C1 phase were evaluated with respect to the deviation from the ideal solution in oxygen potential.
Thermodynamic Modeling The thermodynamic modeling used in this study is based on the CALculation of PHAse Diagram (CALPHAD) technique.
The thermodynamic modeling for Pu-U O-Pu Research O-Am © O-Np 2008O-U Materials Society !!! t n a t or p Im
O-Pu-U O-Pu-Am The data for each binary
O-Pu-U-Np
system are more precise, the assessment for O-Pu-U, O-Pu-Am and/or O-Pu-U-Np systems are more accurate.
The solid solution phase was treated as the regular solution model. G = G ref + ∆G id + ∆G ex G ref = xA GA + xB GB + ・・・ : Contribution of pure components of the phase to the Gibbs free energy GA : for component A
© 2008 Society GB :Materials for component Research B ∆G id = xA RT ln xA + xB RT ln xB + ・・・ : Ideal mixing contribution, known as ideal entropy of mixing ∆G ex = xA xB { L0 + L1 ( xA – xB ) + L3 ( xA – xB ) 2 + ・・・ : Contribution due to non-ideal interactions between the components, known as excess Gibbs free energy of mixing
∆G ex = xA xB { L0 + L1 ( xA – xB ) + L3 ( xA – xB ) 2 + ・・・ : Contribution due to non-ideal interactions between the components, known as excess Gibbs free energy of mixing L : Interaction parameters Li = ai + bi T + ・・・
（ i = 0, 1, 2, ・・・）
© 2008 Materials Research Society These interaction parameters for each systems were evaluated in the present study.
The fluorite structure phase was expressed by the sublattice model. Example : P
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