Submitted herewith are source and special nuclear material composition of ending inventory reports for the month of July 1966. Normal uranium, depleted uranium, plutonium, thorium, U-233, tritium, deuterium, enriched lithium, neptunium 237 and plutonium 238 are all inventoried.

Approximately ten years ago single-tube tests demonstrated the feasibility of using unfiltered river water as a reactor coolant from the standpoint of aluminum corrosion and film formation. However, some effluent activity penalty was indicated. Inasmuch as both current water plant operation and the characteristics of Columbia River water have changed, it was deemed appropriate to reinvestigate the use of partially treated water as a reactor coolant. This report summarizes the results of a half-reactor test carried out at F Reactor.