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次世代高速炉の炉心構成要素設計に係る熱流動評価,3; 炉心燃料集合体流量調節機構の数値解析

Thermal-hydraulic evaluation for fuel assembly design of next generation FBR in Japan, 3; Numerical analysis for entrance nozzle of fuel assembly

渡辺 収*; 早川 教*; 碇本 岩男*; 大島 宏之

Watanabe, Osamu*; Hayakawa, Satoshi*; Ikarimoto, Iwao*; Ohshima, Hiroyuki

次世代高速炉燃料集合体入口部の流量調節機構について、数値解析による設計成立性の評価を指向している。その適用性検討として、もんじゅエントランスノズル単体試験を対象に、商用CFDコードを用いた3次元流動解析を行った。CFDコードによる炉心流量調節機構の圧力損失係数の評価結果は、設計で見込まれる不確かさの範囲内で試験結果を再現し、CFDコードによる3次元流動解析は炉心流量調節機構成立性評価への適用性について見通しを得た。

Numerical investigation using commercial CFD code was performed to estimate flow characteristics of the entrance nozzle of the fuel subassembly of sodium-cooled fast reactor. A three-dimensional numerical simulation of the entrance nozzle test section simulating the fuel subassembly of Monju reactor was carried out. Magnitude of the pressure loss coefficient obtained by the numerical results agreed to that of the experimental result within the uncertainty range required in reactor design. As the result, potential applicability of the numerical simulation using the CFD to design of entrance nozzle of the fuel subassembly was confirmed.

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