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高速増殖炉のピンバンドル内側の速度場計測

Measurement of a velocity field in a pin bundles in FBR

越智 大輔*; 染矢 聡*; 大島 宏之; 岡本 孝司*

Ochi, Daisuke*; Someya, Satoshi*; Ohshima, Hiroyuki; Okamoto, Koji*

高速増殖炉の高い安全性・効率を確保するには、高精度かつ実用的な炉心熱流動評価手法が不可欠であり、その開発には要求される予測精度以上の精度を持つ実測データが必要である。本研究では、解析結果検証用データの取得のために、高速炉燃料ピンバンドルを模擬した7本ピンバンドル体系の試験装置を製作し、水流動実験を実施した。実験では、高時間分解能で熱流動場の軸流方向速度分布データをPIV法により取得した。

It is important to advance safety and efficiency of the FBR. A numerical prediction method of high accuracy and its validation with a simulated thermal flow field are indispensable. A wire-wrapped rod bundle system, which briefly simulated the fuel rods system in FBR, was built up in the experiments. The wire-wrapped rods were made from Mexflon-material, of which refractive index was exactly same with that of water. The particle image velocimetry was applied to measure the velocity field in the narrow gap between wire-wrapped rods, with variable flow rates and the temperature conditions. The aim of this study was to contribute to the certification of results of numerical simulation for the safety design of the FBR.

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