INITIAL POST NEUTRON MEASUREMENTS IN THE ORR

Research Reactor) was completed at 6:06 PM, March 21, 1958. Following the initial instruments and controls performance checks using a small cores fullsize cores were assembled for the post neutron measurements. The measurements included core and rod reactivity calibrations, the temperature ccefficient, the reactivity effects of voids, the reactivity effects of experiments, the reactivity effects of fuel additions, and the spatial distribution of the thermal neutron flux. The results of the measurements are given together with discussions of the methods. (auth)