Deep-sea disposal by dilution and dispersion

Mechanism

Encapsulate low- and intermediate-level radioactive waste in a solid matrix (resin, bitumen, or cement), load it into drums, and sink it in deep ocean far from populations. The approach rests on three premises: the deep ocean is so vast and immobile that any release dilutes to insignificance; the matrix and drum contain the waste while it is most active; and distance from people removes the exposure pathway.

Where it fits

This was the accepted disposal approach adopted by several European states from the late 1940s until the early 1980s, and the reason the North-East Atlantic and other sites hold large drum inventories today. It is included as the historical baseline against which containment-with-retrievability and outright prohibition are the alternatives.

Operating profile

Cheap and operationally simple at the time. It is irreversible once drums disperse across the abyssal plain, and it depends on assumptions about deep-ocean behaviour and long-term drum integrity that can only be tested by returning to the site decades later. The attached case study documents that long-term outcome.