That's not really what he means. I'm pretty sure, he's talking about creating special nuclear reactors to do the job and generate power at the same time.
A plasma is basically a just a gas where the atoms have no electrons. To get rid of nuclear waste, you need to get the nuclei to split into less volatile isotopes.
My experience has been that many applications (web apps in particular) use a relational database to break up documents into an SQL schema so they can be indexed, then assemble them again when needed. Mongo really ratchets down the friction on that operation. Instead of spending time building a schema and writing lots and lots of insert and update statements, you just build a JSON object and send it over.
The 1 mSv/Y guideline is based on a hypothesis that extrapolating downward from higher dosages that have well understood health effects we can infer the effects of lower dosages. They call this the Linear no-threshold model. It was chosen because it's the most conservative, safest option.
Scientists suspect that it's wrong though. We have DNA repair mechanisms that may catch many errors.
