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It means most of the radioactive material has been removed. It is more pure than the local drinking water.
Very close. Heavy water is specifically deuterated water. Deuterium is a stable form of hydrogen, so heavy water is not radioactive. So tritiated water is 'superheavy' (and radioactive) water. Tritium has a half-life of about 12 years I think, so it will continue to dissipate in decades of time, much faster than many other nuclear wastes.
One of my impressions of Japan is they go all out for infrastructure. You might be way out in the mountains somewhere, turn a corner and theres some colossal concrete retaining structure holding up your little road against the forces of water and gravity. And there's tunnels everywhere, even on tiny little roads - but that's understandable given how wrinkly the topography is.
