Analysis code development for the direct reactor auxiliary cooling system of the pool-type sodium-cooled fast reactor

Abstract

Sodium-cooled fast reactor (SFR) is one of the most promising reactors among the six Gen-IV reactor systems due to its significant advantages in close fuel cycle, comprehensive technology foundations and operation experiences. China is designing and constructing a demonstration SFR, in which, to ensure the reactor passive safety, a direct reactor auxiliary cooling system (DRACS) with the inter-wrapper flow is proposed as the decay heat removal system. Xi'an Jiaotong University is in charge of the DRACS analysis code development. The physical models in the DRACS are extracted and the numerical models for each component are established. The Gear method and the SIMPLE method are adopted as the primary solution algorithm. The code is developed and validated by EBR-II and PHENIX benchmarks, the results of which indicate that the code can predict experimental results very well.

Hydraulic Characteristics and Numerical Simulation of the Entrance Section of Ladder-Shaped Spillway

“…in Zhangfeng reservoir are simulated by Li et al [8], and its results are consistent with the experimental ones [9]; the outflow capacity and water surface line of side-slot spillway are analyzed with comparison to verify the validity of hydraulic cal-culation by Yan et al [10]; then, the energy dissipation of the ladder-shaped spillway is explored based on the flow velocity by Zhang et al [11] and Shen et al [12]. The influential factors of the ladder-shaped spillway are analyzed by Zhang et al [13]; the physical model and numerical simulation are adopted by Knop and Mattioli [14] to analyze the hydraulic characteristic of the ladder-shaped spillway; the above investigations have enormously improved the development of the theory of hydraulic characteristics, and the numerical results can be verified by the experimental ones [15][16][17], so the numerical method with the experimental testing has been widely applied to model the flow state of water, especially for the spillway [18][19][20]. In the paper, the flow characteristic of the ladder-shaped spillway is simulated, and it is compared with the experimental results; the conclusions demonstrate that the method is feasible.…”