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[en] Graphite dust has an important effect on the safe operation of the HTGR. Most researches of graphite dusts 'production and migration focus on the physical mechanism. This study investigates the chemical mechanism of graphite dusts' migration from the reactor core to the steam generator through an ideal model based on chemical thermodynamics. The results show that the impurities in helium coolant react with graphite components in the reactor core due to high temperature and then the reverse reaction happens with the production of graphite dust in the steam generator due to low temperature. According to the calculations, the amount of graphite dust increased with the increasing temperature in the reactor core. Also, the influence of the initial amount of CO and H_2 on the amount of graphite dusts produced in the steam generator is investigated. The calculations shows that more Co and H_2 lead to more graphite dusts produced, though the effect of the amount of H_2 is more complicated. (author)
Source
Tsinghua University, Institute of Nuclear and New Energy Technology (INET), Beijing (China); China Huaneng, Shandong Shidao Bay Nuclear Power, Co., Ltd., Beijing (China); Chinergy Co., Ltd., Beijing (China); vp; ISBN 978-7-89395-349-1; 
; 2014; 6 p; HTR2014: 7. International Topical Meeting on High Temperature Reactor Technology; Weihai (China); 27-31 Oct 2014; HTR2014--61188; Country of input: International Atomic Energy Agency (IAEA); 12 refs., 5 figs., 7 tabs.
; 2014; 6 p; HTR2014: 7. International Topical Meeting on High Temperature Reactor Technology; Weihai (China); 27-31 Oct 2014; HTR2014--61188; Country of input: International Atomic Energy Agency (IAEA); 12 refs., 5 figs., 7 tabs.