REACTOR DEVELOPMENT QUARTERLY PROGRESS REPORT. 4000 PROGRAM

The status of Experimenial Boiling Water Reactor development is reviewed. Shell testing, control mechanism development, fuel corrosion, and dimensional stability studies, and design consideration to facilitate D/sub 2/O operation are discussed. Fuel plate and subassembly fabrication, corrosion, and radiation damage studies were continued. Reactor water filtration, purification, and induced activity are considered. High-temperaiure operational tests were run on Experimental Breeder Reactor mechanisms. Though several minor malfunctions were encountered, the basic operation is considered satisfactory. Studies of the physical and metallurgical properties of U -- Mo, U - Zr, U -- Pu, and U -- Pa -- Mo alloys for fuel elements were conducted. Conversion ratio deiermination for the second loading of EBR-I gave a value of 1.03 plus or minus 0.05. Alloys and systems w-ere irradiated anci the effects of the irradiation on corrosion determined. Included in the irradiation were U, U - Si, Nb - Sn, UO/sub 2/, and Al - Ni. (For preceding period see ANL-5476.) (D.E.B.