This report was prepared at Pacific Northwest Laboratory by Battelle-Northwest (BNW) under Contract No. AT(45-1)-1830 for the Atomic Energy Commission, Division of Reactor Development and Technology. It is a report on design-related technical progress for the Fast Flux Test Facility, during the period October 1, 1968 through February 28, 1969.

Work performed by Battelle-Northwest and its supporting contractors on the AEC-sponsored Fast Flux Test Facility Project is summarized and interpreted for the reporting period. Project activities are reported herein under the following major headings: Plant Design, Construction, and Operation; Components Development; Instrument and Controls Development; Sodium Technology, Core Development; Reactor Materials Development; Fuels Development; Physics; and Reactor Safeguards.

This report was prepared by Battelle-Northwest under Contract No. AT (45-1) -1830 for the Atomic Energy Commission, Division of Reactor Development and Technology, to summarize technical progress made in the Fast Flux Test Facility Program during March, April, May and June 1970.