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W2291323861 abstract "The simulation of nuclear reactor fuel performance involves complex thermo-mechanical processes between fuel pellets, made of fissile material, and the protective cladding barrier that surrounds the pellets. This paper examines various mathematical and computational issues that impact the thermo-mechanical response of reactor fuel, and are thus important to the development of INL’s fuel performance analysis code, BISON. The code employs advanced methods for solving coupled partial differential equation systems that describe multidimensional fuel thermomechanics, heat generation and transport within the fuel, chemical constituent and fuel structural degradation. BISON is designed for fully coupled, steady and transient analysis, and to be efficient on both desktop computers and in massively parallel environments. It employs physics-based preconditioned Jacobian-free Newton-Krylov solution methods and is developed using modern software engineering principles to form a robust, extensible software architecture to provide a predictive capability for fuel performance analysis. BISON is built upon a code framework based on tight coupling of two and three dimensional fuels physics models that employ physics-based preconditioned Jacobian-free Newton-Krylov solution methods using modern software engineering principles. Goals of the code are to perform higher fidelity calculation of two and three dimensional pellet cladding mechanical interaction, cracking, and to support advanced models to provide a parallel predictive analysis capability. Significant progress has been achieved towards developing a fully-coupled solution methodology for thermomechanics coupled to oxygen diffusion and in creating a base multidimensional thermomechanics code that employs these solution methods on UO2 fuel pellet geometries. BISON is being developed using modern software engineering principles resulting in a code that is inexpensive to maintain as well as meeting software quality goals. This study illustrates the efficacy of this approach for three-dimensional parallel thermomechanics coupled with oxygen diffusion run on up to 1024 processors. Further, the algorithmic scalability of the Jacobian-free Newton Krylov method was excellent for a three-dimensional coupled thermomechanics/oxygen diffusion problem." @default.
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W2291323861 date "2009-01-01" @default.
W2291323861 modified "2023-09-26" @default.
W2291323861 title "Computational foundations for reactor fuel performance modeling" @default.
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