Progress in the thermodynamic modelling of the O-U binary system

被引:57
作者
Chevalier, PY [1 ]
Fischer, E [1 ]
Cheynet, B [1 ]
机构
[1] CNRS, INPG, THERMA, UMS, F-38402 St Martin Dheres, France
关键词
D O I
10.1016/S0022-3115(02)00813-9
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The fuel of civil nuclear plants, UO2, melts at 3120 K. During an hypothetical severe accident, urania, submitted to high temperatures and various oxygen potentials, presents a wide non-stoichiometry range: the melting temperature of UO2+/-x related to oxygen potential, decreases in all cases. In this scenario, urania could react with other materials, firstly zircaloy, and the melting temperature of (U, Zr)O2+/-x, still decreases. That is why the critical assessment of the O-U binary system including the non-stoichiometry range of urania, is a major step to a correct thermodynamic modelling of multicomponent systems for nuclear safety. The very numerous experimental information has been compiled and analysed. The associate model was used for the liquid phase, and a sublattice model for UO2+/-x; U4O9-x, U3O8 and UO3 were treated as stoichiometric. Phase diagram and thermodynamic properties have been calculated from the optimised Gibbs energy parameters. The calculated consistency with the experimental ones is quite satisfactory. (C) 2002 Published by Elsevier Science B.V.
引用
收藏
页码:1 / 28
页数:28
相关论文
共 101 条
[1]  
ACKERMANN RJ, 1972, HIGH TEMP SCI, V4, P496
[2]   A THERMODYNAMIC STUDY OF URANIA-URANIUM SYSTEM [J].
ACKERMANN, RJ ;
RAUH, EG ;
CHANDRASEKHARAIAH, MS .
JOURNAL OF PHYSICAL CHEMISTRY, 1969, 73 (04) :762-+
[3]   MECHANISTIC STUDY OF OXYGEN THERMAL-DIFFUSION IN HYPERSTOICHIOMETRIC URANIA AND URANIA-PLUTONIA SOLID-SOLUTIONS [J].
ADAMSON, MG ;
CARNEY, RFA .
JOURNAL OF NUCLEAR MATERIALS, 1974, 54 (01) :121-137
[4]  
AITKEN EA, 1966, P S THERM NUCL MAT I, V2, P435
[5]   LES EQUILIBRES DES COMPOSES OXYGENES DE LURANIUM ENTRE 1500 ET 2000-DEGREES-K [J].
ANTHONY, AM ;
KIYOURA, R ;
SATA, T .
JOURNAL OF NUCLEAR MATERIALS, 1963, 10 (01) :8-14
[6]   ELECTRICAL PROPERTIES OF NONSTOICHIOMETRIC URANIUM DIOXIDE [J].
ARONSON, S ;
RULLI, JE ;
SCHANER, BE .
JOURNAL OF CHEMICAL PHYSICS, 1961, 35 (04) :1382-&
[7]   NONSTOICHIOMETRY IN URANIUM DIOXIDE [J].
ARONSON, S ;
BELLE, J .
JOURNAL OF CHEMICAL PHYSICS, 1958, 29 (01) :151-158
[8]  
AUKRUST E, 1962, P S THERM NUCL MAT I, P713
[9]   MELTING TEMPERATURES IN SYSTEM URANIUM-URANIUM DIOXIDE [J].
BANNISTER, MJ .
JOURNAL OF NUCLEAR MATERIALS, 1967, 24 (03) :340-+
[10]  
BANNISTER MJ, 1974, J NUCL MATER, V55, P345