Are you serious re Fukushima?
Absolutely the scenario as it played out. On site generators and back-up batteries were inundated with sea water rendering them useless. A shipment of batteries from off-site was diverted in a bureaucratic SNAFU and never reached the plant. Heroic and desperate operators devised a plan to operate vital valves by literally going inside the stricken plants with a portable compressor to operate pneumatic valves manually to provide emergency gravity cooling and as a last resort dump the contents of the Toroid.
Those efforts ultimately were unsuccessful of course resulting in run-away reactors, splitting of water molecules, production of Hydrogen gas, activation of pressure relief valves releasing Hydrogen, and the resulting Hydrogen explosions that destroyed the reactor buildings. The reactors then melted down, breached the reactor vessels and containments and deposited corium in the bedrock strata below.
That’s where things stand today with hot reactor cores emitting fission products into the ground water. The Japanese and world communities have constructed a boundary wall around the plants by drilling bore holes and and injecting Nitrogen to freeze the area. They the pump out a good portion of the contaminated ground water for storage and treatment.
Cutting edge technologies are being developed on site by the biggest players worldwide to treat contaminated water and are showing a lot of good results. I’m no scientist but that is my understanding.