Did you really read the article? The Hanford site was used in the 80s to produce weapons-grade nuclear material. An accident there is related to nuclear energy in the same way that forest fires are related to fireplaces.
Actually the Hanford site goes back to the manhatten project where it was used to produce plutonium and since that time continued to produce the fuel for our nuclear arsenal during the Cold War. One of the original reactors from the manhatten project is now open for tours and its fascinating to visit. Highly recommend for anyone nearby in the PNW to check it out. (Google "manhatten project b reactor".)
The point is that the Hanford site is unrelated to the future use of nuclear for energy production, not that in the past nuclear energy production and nuclear defense have been entwined.
