They use about 1/200th amount of fuel compared to current uranium reactors, so the amount of total waste is small. About 1 tonne thorium per one gigawatt-year.

They use about 1/200th amount of fuel compared to current uranium reactors, so the amount of total waste is small. About 1 tonne thorium per one gigawatt-year. And the wastes they produce have a far smaller portion of long lived isotopes, because the reactor controls very well what substances receive neutrons. Here's the best image comparison I could find. http://4.bp.blogspot.com/-mAg4r-09gm0/TdZeWHzJWEI/AAAAAAAAAh4/8X7A1Wd1NAE/s1600/comparison+in+fuel+cycles.jpg http://4.bp.blogspot.com/-mAg4r-09gm0/TdZeWHzJWEI/AAAAAAAAAh... http://4.bp.blogspot.com/-mAg4r-09gm0/TdZeWHzJWEI/AAAAAAAAAh4/8X7A1Wd1NAE/s1600/comparison+in+fuel+cycles.jpg http://4.bp.blogspot.com/-mAg4r-09gm0/TdZeWHzJWEI/AAAAAAAAAh...