Thermal experiments with LMFBR subassembly models in sodium flow

Within the framework of the Fast Breeder Project research work has been undertaken at the Karlsruhe Nuclear Research Center on the thermal and fluid dynamics of nominal and distorted core subassemblies. In 19-rod bundle models (P/D=1.30, W/R=1.38) three-dimensional temperature distributions were measured in the cladding tubes exposed to sodium flow. Results of measurements of the azimuthal temperature profiles of rotated rods in the duct wall zone are indicated for different operating conditions 80<Pe<360, 45<q<90 W/cm2, evenly distributed load and oblique load; different axial positions of the spacer grids; and different positions of one bowed rod