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Burnup characteristics of burnable poison and core characteristics of HTTR

Fujimoto, Nozomu; Nojiri, Naoki 

The HTTR uses burnable poison to compensate the change in reactivity with burnup. The burnable poison is a rod type and the change in effective absorption cross section become large due to its shape. Therefore, change in effective cross section of burnable poison due to burnup, temperature, fuel enrichment, etc. are evaluated and the core calculation model for burnup calculation. Using the model, burnup calculations are carried out and compared with results of experiments and other code. It become clear that the model shows reasonable results.

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