Assessment of BISON capabilities for component-level prediction of tritium transport in fusion and fission applications.

• We assessed the hydrogen migration and redistribution model in the BISON code for component-level tritium transport. • Overall, the capabilities of the BISON code for component level modeling of tritium transport are promising. • A calibration method resulted in improved BISON predictions. We assessed the hydrogen migration and redistribution model implemented in the BISON fuel performance code for component-level tritium transport applications in fusion and fission example scenarios. We developed BISON models of an ITER heat exchanger, light water reactor fuel cladding, and a fluoride salt cooled high temperature reactor heat exchanger. Reasonable agreement between reported values in reference studies and BISON predictions demonstrated the ability of the BISON models to predict tritium transport behavior through steel materials. Next, sensitivity and uncertainty analysis was used to understand key parameter sensitivities within the BISON model for evaluation of tritium migration and redistribution.. The sensitivity analysis showed that the diffusivity activation energy was the most important parameter and that the heat of transport was the least important parameter for tritium migration in steels. Overall, the capabilities of the BISON code for component level modeling of tritium transport are promising. [ABSTRACT FROM AUTHOR]