The material at Dounreay is not waste, it is a nuclear material from the fast breeder reactor programme that requires appropriate management.

敦雷的原料不是废料，而是来自快中子增殖反应堆计划的需要适当管理的原材料。

youdao

The NDA held a public consultation on a number of options for what to do with Dounreay's breeder material.

BBC: Nuclear material moved by train from Scotland to England

The Nuclear Decommissioning Authority (NDA) said there was a "clear and compelling" case to deal with the breeder material at Sellafield.

BBC: ?30m to take Dounreay material by rail to Cumbria

And the result is, as you suggested, that India now gets to produce an unlimited amount of fissile material from something called fast breeder reactors, and please don't ask me what that means.

NPR: Week in Review: India; Guantanamo; Iraq; FEMA