Paraphrase

Original text:

“These new reactors would all operate at high temperatures, improving their efficiency.  And they would include simplified safety features that do not rely on sophisticated backup systems or experienced operators — all are, in principle, ‘meltdown proof’ and can cool themselves down in the event of an accident with minimal, if any, human intervention. . . . Experts agree that reactors will need to be a lot cheaper to run. And to sway a nuclear-averse public, the next generation of reactors will need to produce much less radioactive waste at terrorist-proof facilities.”

Paraphrase:

Butler suggests that the new reactors are deemed “meltdown proof” as they are efficiently capable of withstanding high temperatures and are installed with safety functions that neither require expert human intervention nor complex secondary systems, in lowering the system’s temperature, in situation of accidents. In order to get the support of the nuclear averse public, the new reactors introduced would have to be able to emit lesser radioactive waste in a safe compound.