ナトリウム冷却高速炉の高温側1次主冷却系統合解析モデルの整備

Development of integrated numerical analysis model for unsteady phenomena in upper plenum and hot-leg piping system of JSFR

田中 正暁  ; 高屋 茂  ; 藤崎 竜也*

Tanaka, Masaaki; Takaya, Shigeru; Fujisaki, Tatsuya*

ナトリウム冷却高速炉の原子炉容器内上部プレナム部とホットレグ配管を統合した解析モデルを整備し、非定常流動解析を実施するとともに、流動解析結果を境界条件として流力振動解析を行う連携手法を整備した。構造応答解析の結果、定性的には既往知見と整合する結果が得られ、実機評価への適用可能性の見通しを得た。今後、定量的に妥当な評価結果を得るべく、解析モデルおよび解析手法を高度化していく。

As flow-induced vibration (FIV) in the hot-leg piping with the short elbow (curvature radius corresponds to diameter) is one of the targeted issues in this study, numerical estimation method for dynamic analysis of mechanical stress on piping has been developed. As the preliminary step in development of the fluid-structure mechanical interaction simulation method, time history response analysis of piping by using the time history data of fluid pressure obtained by the unsteady hydraulics simulation as its boundary condition was attempted. Through the numerical results, potential capability of the dynamic analysis of piping were confirmed and unsteady behavior of pipe due to the unsteady flow phenomena was analyzed.