The physical fall/collapse of an old tunnel ceiling almost certainly knocked loose surface contamination and grit from nearby surfaces .. As well as the physical hazard of being underground while the roof is collapsing!
Many hundreds of areas at Hanford are not contaminated nor contain radioactive piping, equipment or elements.
Many acres and storage spots do contain contaminates.
We don’t know yet enough to decide or debate anything. No reports of injuries?
Our local media is reporting no injuries and no airborne radiation has been detected.