The Department of Energy regulations require the solidification of high-level radioactive wastes within what timeframe of their production?

The correct timeframe for the solidification of high-level radioactive wastes as required by the Department of Energy regulations is five years. This requirement is crucial because solidifying radioactive wastes helps to stabilize them, reducing the risk of leakage and contamination, and ensures safer handling, storage, and disposal processes. The five-year requirement strikes a balance between the need for safety and the practical considerations of waste management, as it allows adequate time for processing while ensuring that hazardous materials are not left in a liquid state for prolonged periods, which could pose increased risks. In contrast, longer timeframes could lead to greater potential for accidents or environmental concerns.