That I have read, and it would be nice if an expert could verify or debunk, is that these type of reactors produce 7% of the production energy (heat) once shutdown. And require 1 ro 3 years of active cooling. Certain hope that is not true, the info comes from wiki so one never knows.
Here is the graph from yesterday's post. It looks like it starts off around 7% but then drops off rapidly to less than 1%. We are five days out so we are probably around half a percent of total heat. Also from the earlier post that puts us at around 2-2.5 MW of heat being produced by each reactor.
So can they get enough water in there to boil off 2 MW of heat. If so this will just be a monstrously expensive cleanup. If not then thing will be a bit more problematic. Not world ending disaster, but the cost goes up dramatically with the radius of the contaminated area.