ZPPR-4 demo criticals program

The ZPPR-4 critical assembly was designed to be similar to the Clinch River Breeder Reactor Plant (CRBRP) design in overall shape, configuration and region-average compositions. A four phase program, directed at design input to the CRBRP, blanket performance, blanket fissile buildup effects, full-core breeding performance and plutonium isotopic effects is described. Experimental results for reaction rate distributions in the blanket, control rod and rod group worths and plutonium isotopic effects are discussed. (auth)