Just a little correction. Hanford is not a power plant. Handford is a nuclear manufacturing and testing facility. Many projects have occured over the years since the 1940s. The most noteable was the Manhattan Project, where the radioactive material for the bombs that ended WW2 was manufactured. Hanford encompasses over 500 sq miles near Richland, WA along the Columbia River. The elk are indeed free to come and go.
Life is like riding bulls. You're never truly ready ..... it just gets to be your turn.