With the initiation of the LAMPRE Program Quarterly Report the opportunity is taken to review the objectives of the program as well as to summarize its present status. The program can be conveniently divided into two separate but related phases. The first is concerned with the design and construction of the first reactor experiment, called LAMPRE I. The second involves problems of specific interest for LAMPRE I as well as to the general class of molten plutonium fueled reactors. A general description. core parameters, reactor and plant configarations, and general status of LAMPRE I are given. Current progress is reported in terms of capsule certification tests, sodium system, fuel element storage, and LCX III measurements. The research and development work in support of the LAMPRE program includes Na loop (heat exchanger) studies. fuel alloy development, container alloy development, core concept studies, nuclear physics calculations, mechanical fabrication and welding development, corrosion studies, liquid fuel handling and circulating experiments, fission gas studies, mobile blanket develepment, and fuel processing experiments. A fairly complete account of tbe various lines of development at the present time is contained. (W.D.M.)

The LAMPRE-I project is summarized in terms of capsule development, sodium system, LCX-III, gas system, and fuel transfer and storage. The 2-Mw Sodium Test Facility was initially placed in operation on Mar. 15, 1960. Since startup, operation has been continuous except for 12 forced shutdowns required for maintenance of auxiliary steam-system equipment and repair of refractory setting in the gas-fired sodium heater. Essentially no maintenance or adjustment hns been required on sodium components or the steam generator. The steam- generating unit is illustrated and design heat-transfer criteria and observed heattransfer data are given. The intermediate sodium heat exchanger, centrifugal sodium pumps, gas-fired sodium heater, sodium flow-control valves, and purification cold trap are discussed briefly. Research and development activities for the LAMPRE Program are reported in the core-development program, core-test facility, mobileblanket studies, fuel-alloy development, container- materials development, and fuel processing. (For preceding period see LAMS- 2438.) (W.D.M.)