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高速炉直管型蒸気発生器解析評価システムの整備; 大型蒸気発生器体系における温度分布評価

Development of simulation system for straight tube steam generator of sodium-cooled fast reactor; Numerical estimation of temperature distribution in large-sized steam generator

吉川 龍志  ; 今井 康友*; 田中 正暁  ; 大島 宏之

Yoshikawa, Ryuji; Imai, Yasutomo*; Tanaka, Masaaki; Ohshima, Hiroyuki

高速炉直管型蒸気発生器の熱流動評価や安全性評価への適用を目的として、ナトリウム側3次元解析と水側マルチチャンネル解析を組み合わせた連成解析システムの整備を進めている。本研究では、大型直管型蒸気発生器体系を対象に、ナトリウム出入口プレナム部を含む蒸気発生器全系を対象とした解析モデルを整備した。複数の伝熱管をプラグした条件を対象とした解析を実施した結果、管束部入口周方向流速分布及び伝熱管プラグ時の局所温度上昇を含む3次元非対称温度評価が可能であることを確認した。

Accurate evaluation of three-dimensional temperature distribution is essentially required for the structural integrity analysis of large-sized straight tube steam generator (SG) of an advanced Sodium-cooled Fast Reactor (SFR). Numerical simulation system to analyze three-dimensional thermal-hydraulics in the straight tube SG has been developed. The three-dimensional simulation on sodium side by the CFD code FLUENT with porous body model was coupled with the multi-channel simulation on water/steam side. Synthetic numerical simulation model of the SG including inlet and outlet plenums were constructed. Through the numerical simulation at the condition with plugged tubes, the characteristic three-dimensional distributions of velocity in the plenum and temperature distribution in the tube bundle were successfully analyzed.

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