Ultimately ending up with a group of thermalized neutrons that also have a certain probability of leakage from the reactor.

But most of the plants have monitoring wells but not where apparently this particular leak occurred. And you remember the reactor oversight process? They got a white finding.

If it leaks it's also out of the system.

But the key here is no leakage.

The leaked documents say that "formation-level planning for a deployment took place from February 2002".