Q... yes, lots of water and continuously will help with the spent fuel. And, 999's proposal is certainly within reason as long as the pumps can handle the volume and pressure required. Small pumps could work if many were used to feed a reservoir for larger pumps. The configuation of the system would depend on waht is available. Certainly an idea worthy of putting a team on ASAP.

As for the reactors... such a plan seems unlikely to me off the top of my head. It might even be a bad idea if it can't be done on an "even" basis, ie, cool one side and cause a stress differential. But, I am not a makeanickel engineer.