Abstract
RELAP5/SCDAP code has been improved by incorporating relevant chemical reaction models to evaluate the graphite oxidation behaviour in High Temperature Gas-cooled Reactor (HTGR). The developed code was validated against three individual experiments with different emphasis. It could be concluded that the developed Burn-off factor (M(B)) correlation showed a better performance on fitting the experimental data than the model proposed from the previous researches. Besides, the variation of the fractions of each gas species after the chemical reactions show a good agreement with the experimental results. Moreover, the temperature transient during the graphite oxidation was also reasonably reproduced with acceptable deviation. All in all, after the improvement, RELAP5/SCDAP code has a better capacity in evaluating the graphite behavior during the oxidation conditions, which improves its reliability on HTGR safety analysis.
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