量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Decay heat produced by neutron irradiation causes temperature rise of blanket under loss of cooling events. Temperature rise becomes large with increase of neutron wall loading (NWL). NWL is expected to increase in DEMO compared to ITER. The transient temperature response of solid breeder blanket was evaluated by using finite element method assuming loss of active cooling. Heat removal capability due to thermal conduction in blanket and radiation heat transfer were studied. Emissivity, thermal conductivity of pebble beds, and initial temperature of pebble beds were considered as parameters in the analyses. For the conditions studied in the present analyses, thermal conductivity of the pebble beds was dominant among the parameters. A cooling method with natural convection of helium gas in vacuum vessel was also investigated to mitigate the excessive temperature rise of the blanket. The helium cooling method might be promising to reduce the maximum temperature of the blanket.
Passive decay heat removal for solid breeder blanket
