>>10932361>If storing nuclear waste is dangerous because of the excess heat generated by the fuel pellets,No, that is not the main problem. Radiotoxicity is.
>then why not use nuclear waste as an energy source until it stops being hot?It can be used, see radio isotope generators. You need to purify the waste though to avoid excessive neutron flux.
>>10932411That was planned, years ago, in the naive 60's I believe. The plan was to place about 1 m3 encapsulated waste in lead and concrete, in the foundation of a building to provide a few kW of heat. Then we got some problems with terrorism where you do not want unrestricted access to nuclear waste.