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新型炉の性能・安全性研究における解析モデル及び試験のスケーリング,1; 高速炉の炉心・機器の熱流動及び安全性

Scaling method for analysis model and experiment for safety study of advanced reactors, 1; Thermal hydraulics and safety of core and components in fast reactors

上出 英樹

Kamide, Hideki

ナトリウム冷却高速炉の自然循環による崩壊熱除去について、試験により現象を把握し、解析手法を検証して実機での予測を行う際の、試験装置のモデル化の考え方をまとめた。実流体であるNaを使った試験では、実機縮尺でないとすべての相似則を合わせられないことから、熱交換が重要なる現象ではNa試験を、それ以外では、熱伝導率が大きく異なる点を逆に利用して水を作動流体とした試験を組合せることで、対象とする現象に合わせて、試験を行うことが可能である。

Several model experiments were carried out to see phenomena and to get validation data for numerical simulation methods as for the natural circulation decay heat removal in a sodium cooled fast reactor. Here, strategy of the model experiments is summarized. When sodium is used as a working fluid, real scaled model is needed in order to match all similarity rules. The sodium experiment is applied to heat transfer oriented phenomena. As for the water experiment, thermal property is much different from that of sodium. However, this will help to mach one of the similarity rules in a small scaled apparatus. Thus, combination of the sodium experiments and the water experiments is used according to the selected phenomena.

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