Multi-objective Optimization Capability for Heterogeneous LWR Fuel Assemblies and Cores

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For some nuclear fuel cycles, particularly those involving high enrichment, or for mixed-oxide (MOX) fuel, there are benefits in varying the properties of the fuel radially, on a section-by-section basis or a pin-by-pin basis, and axially along the assembly. There are also benefits in including multiple fuel assembly designs within the core, exploiting radial-zoning and/or "checker-boarding" effects on overall core performance.Heterogeneity in fuel assembly and core design inevitably increases fuel fabrication costs and the size of the design space to be searched, so a capability to explore rigorously and systematically the trade-offs between in-core fuel performance objectives and the fabrication costs of heterogeneous assembly and core designs would be a helpful aid to decision-making. Advances in multi-objective optimization methods make the development of such a capability a realistic proposition.This project is part of the Sustaining Independent Nuclear Expertise (SINE) programme managed by Frazer-Nash Consultancy on behalf of the UK Ministry of Defence.Project objectivesA prototype computational design system for heterogeneous LWR fuel assemblies and cores, involving the integration of optimization and reactor physics and thermal-hydraulic analysis codes, will be developed with the aims of:1. Demonstrating the effectiveness and the utility of multi-objective optimization methods for reactor fuel and core design;2. Developing UK national capability and methods in the design of nuclear reactor fuel and cores.