A105 高速実用炉蒸気発生器におけるナトリウム-水反応時の隣接伝熱管内熱伝達特性(OS8 高速増殖炉の蒸気発生器(Na-水反応))

概要

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In the case of sodium-water reaction accident in a steam generator of sodium-cooled fast reactors (FRs), adjacent heat transfer tubes may be damaged due to high temperature environment of the reaction field. Therefore, it is integral to predict such event with high accuracy for the safety assessment of FRs. For the purpose of understanding the overheating tube rupture mechanism, an experimental study has been performed to clarify waterside heat transfer characteristics during up-flow in a vertical tube under the real plant part-load operation conditions in which safety margin is least. A test tube was heated rapidly and the time averaged heat flux was estimated using an inverse solution from the measured temperatures at two points on three different locations along the tube. It was conformed that the heat transfer on the wall changed from nucleate boiling to transient-film boiling all over the heating section and dried-out surface spread from downstream toward upstream. We improved the heat transfer correlations applied to RELAP5 code and made sure the adequacy of these correlations to evaluate tube overheating.
一般社団法人日本機械学会の論文
2011-06-22