Use of inlet mixing nozzles to distribute flow in sodium cold trap crystallizers was investigated. Water modeling tests were run in a 100-gal plastic model at water flows of 5.7 to 30 gal/min. During these tests a salt water tracer pulse was introduced into the inlet stream. This tracer was detected by conductivity probes placed in the tank at various angular locations at the top, middle, and bottom. Flow and water temperature in the tank were adjusted to satisfy hydraulic similarity, defined by matching a mixing and flow Reynolds number in the model and sodium component. The results of these tests indicate that modification of the inlet pipe at a 90-deg bend, directed tangentially on the annulus centerline, will produce significant improvements of flow distribution.