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Research and development on passive cooling system

受動的冷却システムの研究開発

高田 昌二

Takada, Shoji

MHTGRの崩壊熱除去用水冷形冷却パネルシステムの高温のガスやスタンドパイプによる構造物温度及び除熱特性への影響を評価するために実験を行った。数値解析コードTHANPACST2の数値解析結果と実験結果とを比較して、圧力容器上部に設置したスタンドパイプの三次元構造をポーラスボディセルにより模擬した数値解析手法及びモデルの検証を行った。実験の結果、スタンドパイプの設置による放射伝熱の減少,高温のヘリウムガスにより過熱される上鏡部における放熱面積の減少によって圧力容器上鏡で温度が上昇することがわかった。数値解析結果は、上鏡頂部で高さとともに上昇する温度分布を適切に評価した。

Experiments are carried out to investigate the effects of the natural convection of superheated gas as well as of the stand pipes on the temperature distributions of the components and the heat removal performance in the water-cooling panel system for the MHTGR for decay heat removal, and to verify the design and evaluation methods. The numerical results of the code THANPACST2 are compared with the experimental data to verify the numerical methods and axi-symmetric model proposed, which can simulate the three-dimensional configuration of the stand pipes on the upper head of the pressure vessel by using porous body cells. The experiments revealed that temperatures increased with elevation on the upper head, because the stand pipes restrict radiation heat transfer to the upper cooling panel and reduce the heat transfer area on the upper head which was superheated by natural convection of helium gas in the pressure vessel. The numerical methods were able to closely duplicate the pattern of the rising temperature profile with elevation around the top of the upper head.

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パーセンタイル:60.51

分野:Nuclear Science & Technology

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