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Design and construction of a prototype instrument for continuous monitoring of fissionable isotope concentrations in processing plant streams is described. Measurements are based on the delayed neutron technique with irradiation of the plant stream by a 238 Pu-Be neutron source and detection of delayed neutrons with 10BF3 filled tubes. A small, general-purpose computer transforms the pulse signals from the 10BF3 tubes to fissionable material level through calculations involving input data reflecting- sample stream flow rate in the monitor, attenuation of neutron flux by boron or other neutron absorbing material in the stream, and calibration factors. This on-line computer also provides continuously updated trend prediction, total amounts of fissionable isotopes in the receiving tanks, and is programmed to actuate alarms upon recognition of fissionable material levels which could build up to levels causing a nuclear unsafe condition, and to give warnings of abnormal conditions resulting from plant equipment deterioration, equipment failure, operator error, or intentional attempts to divert fissionable material. Sensitivity of the prototype instrument is better than 0.001 g/l of 235U. Suggestions are made for an operational model of the fissionable material monitor system for installation in the Idaho Chemical Processing Plant on low level waste, plant input, or intermediate streams.