Christ I'm an idiot. I wasn't paying attention and missed that the reactor design was divided into (previously fully distinct) quadrants.That design is no longer viable, partly because of the neutron reflector changes. Previously, any neutron not reflected got absorbed - i.e. taken out of the reaction. Now, they can go through, and will trigger fission in another "subunit" of the reactor.
Additionally, even back then, that reactor was not fully safe; I could only load it to about 70%.
For all intents and purposes that used to be 4 different reactors. Its now one big one, with limited fission inter-reactions (dunno if that's a term but I'm coining it if it isn't)
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