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Abstract
This study evaluated graphite dust emissions in an HTGR depressurization accident. A simplified experimental platform based on air at ambient temperature was developed to simulate particle resuspension during a depressurization accident and helium blower startup. Then, computational fluid dynamics models were used to calculate the impact, rebound, and deposition of graphite particles to determine the particle deposition fraction in the containment based on the HTR-PM design parameters. The classical deposition formula was then used to estimate the proportion of particles released into the environment through a releasing pipe. The results show that the mass of particles released increases with decreasing helium temperature. The release mass first increases and then decreases with increasing particle diameter. This analysis shows that about 3–5 g of particles will be released to the environment in a design-basis HTR-PM depressurization accident.
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