From the Executive Summary: "On July 19, 2006, the Department of Homeland Security (DHS)\Chemical and Nuclear Preparedness and Protection Division (CNPPD) Kansas City Field Office, evaluated an exercise in the plume exposure pathway emergency planning zone (EPZ) around the Cooper Nuclear Station. In addition, out-of-sequence drills were conducted on June 20-22, 2006. The purpose of the exercise and drills was to assess the level of State and local preparedness in responding to a radiological emergency. [...] This report contains the evaluation of the biennial Full-Scale Exercise conducted on July 19, 2006."
U.S. Nuclear Regulatory Commission: https://www.nrc.gov/