Numerical simulation of distribution of melt component in reactor

Sato, Takumi ; Hirata, Naoya*; Oikawa, Katsunari*; Nagae, Yuji ; Kurata, Masaki

Macroscopic segregation of molten core and melt components occurs with slow cooling rate in the accident of Fukushima Daiichi Nuclear Power Plants. In this study, solidification and microscopic segregation are simulated with the Scheil model and thermal properties calculated by Thermo-calc in order to investigate an influence of cooling conditions on macroscopic segregation. A macroscopic segregation behaviour has been calculated for UO $_{2}$ -ZrO $_{2}$ -FeO system, which are major oxides of molten core materials in various conditions. According to calculated results, UO $_{2}$ and ZrO $_{2}$ were concentrated in initial solidification area. On the other hand, FeO was strongly concentrated in later solidification area. FeO was significantly segregated because FeO does not be dissolved in UO $_{2}$ and ZrO $_{2}$ . In addition, macroscopic segregation tends to become stronger in the conditions of slow solidification rate and fast velocity of solidification interface.

Language	:	English
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Meeting title	:	2nd TITECH-CRIEPI-JAEA Joint Workshop
Held date	:	2018/07
Location (city)	:	Tokyo
Location (country)	:	Japan
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DOI for research data	:
Keywords	:	凝固; マクロ偏析; 計算流体学; 福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
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Article of JAEA R&D Review	:
Cooperating Institute	:	東北大学

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Registration No. : BB20180383
JAEA Abstracts No. :
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