[cyberax]

It boils off the coolant, creating a vapor lock, then water-zirconium reaction happens. Then it explodes and ruins the shaft. So you'll have to drill a rescue well, and then defuel the reactor to avoid any possible contamination.

Again, this is a monumentally stupid idea for no reason whatsoever.

And modern reactors are already passively safe. Even if the core melts down, it'll be contained in a core catcher: https://en.wikipedia.org/wiki/Core_catcher

[consensus1]

It boils off a 1 mile deep water column? And you don't need a core catcher when you are already 1 mile deep in bedrock. It just goes to the bottom of the hole.

[cyberax]

> It boils off a 1 mile deep water column?

Yes?

> And you don't need a core catcher when you are already 1 mile deep in bedrock.

Yes, you do. Because if the shaft explodes or gets blocked near the top, the fission products can travel up the water column.

[consensus1]

So this thing is just boiling off water from the mile deep water column, and nobody things "hey maybe we could add some more water"? How does a shaft "explode"? What is generating the explosive force?