Resonance parameter adjustment methodology based on integral experiment analysis

A methodology to adjust resonance parameters is developed and rested on the lowest-energy resonances of U-238, Pu-240, and Pu-242. It is shown that ad justing the basic nuclear parameters is the only consistent way to adjust i nfinitely dilute cross sections and to reduce the cross-section deconvoluti on problem. Taking into account the self-shielding effects enables Ils to t reat different kinds of integral experiments (fast and thermal) and to achi eve a statistically consistent adjustment. Also, the standard multigroup cr oss-section adjustment in the epithermal region can be interpreted as an in dication of the required correction of an average reaction rate.