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

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

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.