Nuclear waste is just a product of nuclear processes . In addition, nuclear waste would could in no way find a path back up to the surface since the nuclear waste would be burned up by the magna. It also seems more economically feasible to just dump all waste in addition to nuclear waste inside an active volcano rather than storing wastes inside mountains inside Nevada. There would be no radioactive contanimation generated if nuclear waste is immersed in magna. To me that seems more economically feasible than spending billions of dollars transporting trash on Space shuttles to the sun.