Experiments and analysis for large conventional fast reactors in ZPPR-18/19

Experiments in ZPPR 18 and 19 provided physics data for large (1100 MWe) conventional LMRs. Measurements focused on the spatial distributions of fission rates and control worths. Experimental results were obtained for the fundamental to first-harmonic eigenvalue separation. In the outer core of ZPPR-18, fuel was arranged in sectors with uranium about the y axis and plutonium about the x axis. In ZPPR-19, the fuel was rearranged to give a uniform outer core distribution. Fission rate C/E values were essentially invariant with radius through the plutonium zones. The control worth C/E values were influences by their proximity to the uranium sectors. 10 refs., 5 figs., 6 tabs.