The dangers posed by long-lived radioactive nuclear wastes and potential nuclear accidents argue against present-day nuclear technology as a major component of Britain's long-term energy future. The problem of finding suitable long-term repositories for nuclear waste in Britain has not been solved despite the expenditure of over 200 million on site investigations. Even when a suitable site is found, there is the basic human factor - people in Britain do not want nuclear waste stored in their own back yards. Experimental nuclear technologies, such as advanced converters and breeder reactors have the severe disadvantage of producing weapons-grade nuclear materials as by-products, leading to insuperable problems of nuclear weapons containment and non-proliferation.