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Thermal-hydraulic analysis of MONJU upper plenum under 40% rated power operational condition

40%出力時における「もんじゅ」上部プレナムの熱流動解析

本多 慶; 大平 博昭; 素都 益武; 吉川 信治

Honda, Kei; Ohira, Hiroaki; Sotsu, Masutake; Yoshikawa, Shinji

本研究では、FrontFlow/Redを用いて「もんじゅ」上部プレナムの詳細熱流動解析を行った。今回のモデルでは、極めて微細なメッシュ分割を行い、フローガイドチューブ,燃料取扱機構などを忠実に模擬した。また、対流項には1次風上差分、拡散項には2次中心差分を適用、乱流モデルにはRNG $$k$$-$$varepsilon$$モデルを適用した。解析の結果、UIS以外の上部プレナムに設置されている構造は温度,速度にあまり影響を与えないこと、今回の結果とUCS領域をポーラスモデルで解析した結果の特徴は類似した傾向を持つこと、そして集合体出口温度とUCS領域において測定される温度の差は比較的小さいことが示された。

In this study, we calculated the thermal hydraulics of the upper plenum of MONJU by the detailed analysis model using commercial FVM code, FrontFlow/Red. The present analysis model simulates all structures with high resolution meshes. The 1st order upwind and 2nd order central difference scheme were applied to the advection and diffusion terms, respectively. And RNG $$k$$-$$epsilon$$ model was applied to turbulence modeling. These calculation results indicated that the structures installed in the plenum except for UIS did not affect largely to the temperature and velocity, the flow characteristics in the present results had similar tendencies with porous media approached applied to the UCS region and that the difference between the temperature measured in the UCS region and that of SA outlets is relatively small.

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