You can’t prove the technology by building a reactor and using it for a while and then saying ‘Look! This one didn’t explode’.
Every reactor ever built has been guaranteed to be safe. Yet 2 of them have experienced meltdowns. This technology is safe in a sense but not in the sense that accidents will not happen. They have happened and they will happen again.
Every reactor ever built has been guaranteed to be safe. Yet 2 of them have experienced meltdowns. This technology is safe in a sense but not in the sense that accidents will not happen. They have happened and they will happen again.