SUBCRITICAL MEASUREMENTS WITH A CYLINDRICAL TANK OF Pu-U NITRATE

摘要

This series of measurements with a mixed Pu-U nitrate solution (280g Pu/liter, 180g U/liter) in a 35.54-cm-diam cylindrical tank provides a wide variety of experimental data for subcritical configurations that can be used to verify calculational methods and nuclear data. The Pu contained 7.85 wt% ~(240)Pu and the uranium was natural uranium. The measurements performed were: inverse count rate, prompt neutron decay constants, inverse kinetics, and frequency analysis by the ~(252)Cf source driven method. These data are presented in sufficient detail that the results of the experiments can be calculated directly. For purposes of extrapolating to the delayed critical height the ratio of spectral densities was linear with height and thus provided the best estimate of critical height.