If any two rods get too close to one another, there will be a "blue flash" (prompt criticality reaction). This is basically guaranteed to happen if they try to pull the thousands of rods out of the wrecked pool one-by-one. That will cause a small nuclear detonation that will destroy the pool and set off most of the other rods. The entire local area will then become so radioactive that they will not be able to continue to supply water flow to (at least) the other three pools, which will then dry up, and in turn go critical.
The Pacific will quickly be dead, the U.S. West Coast will be abandoned, and the entire Northern Hemisphere will soon thereafter become uninhabitable. 80% of those who remain there will get carcinomas.
So let's just flood the pools with molten copper and stop this madness.