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By Kevan Weaver; Cliff Davis; Ken Czerwinski; Theron Marshall; Michael Pope; All authors

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As a consequence of the current multi-batch reload scheme, the power history for the average assembly varies significantly between fuel reload and subsequent shuffling but is fairly constant during irradiation. 6. The startup core is fueled with several batches 31 ranging in enrichment from 5 to 10 a/o 235U in U. 2. 6. 997(5)). While increasing the enrichment in the 2nd batch would certainly increase the reactivity at this stage in life, the current startup configuration is meant to rapidly advance the core model to its equilibrium cycle.

Six assemblies from each batch are removed to make room for control rod assembly locations. 8). By removing these assemblies, the fuel volume fraction is approximately 55% instead of the 45% in the demonstration core. 9. The results essentially mirror those for the demonstration core, thus verifying that B&B mode operation can be achieved with a UC fueled GFR. However, the combination of a lower thermal power (2400 MWth), higher heavy metal loading, and slightly higher burnup results in a longer cycle length.

Second, partially burnt assemblies are progressively moved towards the center of the core in order to sustain core criticality over multiple (six) cycles. Third, the power shape should remain fairly constant during irradiation to enable the use of fixed flow orificing to improve power conversion efficiency. Fourth, the radial power shape should be as flat as possible to maximize core power density. As a consequence of the current multi-batch reload scheme, the power history for the average assembly varies significantly between fuel reload and subsequent shuffling but is fairly constant during irradiation.

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