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Study on a suppression of sodium-water reaction in SFR by applying sodium with suspended nanoparticles

ナノ粒子分散ナトリウムの適用によるSFRにおけるナトリウム-水反応抑制に関する研究

神田 大徳; 吉岡 直樹*; 荒 邦章 ; 斉藤 淳一  ; 永井 桂一 

Kanda, Hironori; Yoshioka, Naoki*; Ara, Kuniaki; Saito, Junichi; Nagai, Keiichi

化学的に活性なナトリウムと水との反応を抑制することを目的に、ナノ粒子を分散させたナトリウム(ナノ流体)の基礎的な物理・化学的特性が研究及び実験により確認されてきた。これらの特性の変化をふまえ、ナノ流体を適用した場合のSFRの蒸気発生器伝熱管破損時の反応ジェット温度評価モデルを構築した。反応ジェット温度の測定結果を用いて、実験解析を実施し、評価手法の妥当性を確認した。また、この評価手法を実機スケールの条件での解析に適用し、SFRプラントにナノ流体を適用した場合の反応抑制効果の見通しを得た。

An important safety concern for SFR is the possibility of steam leaking from a tube at high-pressure into surrounding liquid sodium within the steam generator. The steam/liquid sodium pair is very reactive and the steam leak will form a sodium-water reaction jet which may attack and rupture adjacent tubes. A study on the suppression of the reactivity of sodium itself using the concept of suspended nanoparticles in liquid sodium (sodium nanofluid) has carried out. From the experimental results for sodium nanofluid, it was clear that the reaction rate and reaction heat with water were decreased by the atomic interaction of sodium with suspended nanoparticles. Taking the changes of physical and chemical property into account, an analytical model for peak temperature within a sodium nanofluid-water reaction jet has been constructed. The object of this paper is to confirm this analytical model for reaction jet temperature and to predict a mitigation effect on adjacent tube damage in a steam generator by applying sodium nanofluid to the secondary coolant of SFR. Comparing calculation results using the analytical model with the experimental results for a steam injection experiment, we demonstrated that the analytical model for temperature within the reaction jet is appropriate.

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