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高速炉蒸気発生器における伝熱管破損事象に関する研究,37; 機構論的解析手法の実規模条件に対する適用性検証

Study on sodium-water reaction phenomena in steam generator of sodium-cooled fast reactor, 37; Applicability of mechanistic numerical method to actual condition

内堀 昭寛 ; 大島 宏之

Uchibori, Akihiro; Ohshima, Hiroyuki

高速炉蒸気発生器の伝熱管破損時事象を評価するため、ナトリウムと水の化学反応及び圧縮性多成分多相流現象に対する機構論的数値解析コードSERAPHIMを開発している。本研究では、SERAPHIMの実規模条件に対する適用性検証を目的としてナトリウム中水蒸気噴出実験の解析を実施した。実験結果との比較から、ウェステージ発生位置や反応ジェットによって形成された温度場を再現できることが分かり、SERAPHIMが実機条件下におけるウェステージ環境を評価可能であることを確認した。

A mechanistic computer program called SERAPHIM to calculate compressible multicomponent multiphase flow with sodium-water chemical reaction has been developed as one of the evaluation methods for heat transfer tube failure accident in a steam generator of sodium-cooled fast reactors. In this study, applicability of the SERAPHIM program was investigated through the analysis of the experiment on water vapor discharging into liquid sodium under the actual condition of the steam generator. The water vapor under expanded jet reacting with the ambient liquid sodium appeared in the numerical result. The high-velocity region of the entrained liquid droplets was formed around the jet. The impingement position of the liquid droplets on the target tube located above the water vapor discharging tube agreed with the position of the wastage mark confirmed in the experiment. The temperature distribution measured around the reacting jet was also successfully reproduced by the SERAPHIM program.

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