Yes, of the surrounding environment. This is a single building more or less single-purpose-build to be contaminated as a last measure. All these exercises are

Yes, of the surrounding environment. This is a single building more or less single-purpose-build to be contaminated as a last measure. All these exercises are inherently economical -- they could just have walked away on the first day and have the whole thing melt down, and the surrounding area wouldn't have been any better or worse off, radiation-wise.