This program which is to demonstrate the utilization of plutonium in a , (1,2) light-water moderated power reactor is entering Phase 2, the Startup Experiments. In this phase of the program, the central portion of the core will be loaded with plutonium fuel such that.the core reac,tivity variation with burhup will be caused mainly by burnup of the plutonium zone. Surrounding the plutonium zone are uranium fuel elements which will ,• be used as driver elements. Several rods will be included •in the plutonium zone to obtain burnup information from special fuel compositions. A series of tests will be conducted during the initial loading of the EBWR in order to measure the reactivity worth of fuel rods, safety rods, voids, and boric acid in the moderator. At various , stages of burnup, the series of tests performed at the time of the startup experiments will be repeated. Also, at these stages a series of rods from the plutonium zone will be :removed and returned to Battelle NorthWest for reactivity measurements in the Plutonium Recycle Critical Facility (PRCF) and subsequently analyzed for plutonium concentration, isotopic composition and to obtain other data which will describe the burnup characteristics. The results of calculations of the reactivity changes expected at startup and 'throughout the burnup of the core are presented in this report. Information obtained during the F

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