As a nuclear engineer, it's hard to use these kinds of intro tools without shouting things at your monitor. For this, it was the omission of xenon when discussing simulating reactor transients.

I get that it's meant to be overly simplified, and it's a neat idea that is probably helpful for communicating some key concepts.

then give us better tools! :) Most of the sims require (at least?) registration with the IAEA: https://www.iaea.org/topics/nuclear-power-reactors/nuclear-r... (I want that Micro-Physics Nuclear Reactor Simulator)

Then there's this https://dalton-nrs.manchester.ac.uk/ but it's down for "maintenance" (a web site - can you imagine?!)

I found this interesting https://www.youtube.com/watch?v=59hVaIjxMIM but people say it does no longer work on recent Windows version. Also I don't like to install random binaries from Mega or similar.

In the end a realistic reactor simulation would probably to complicated for the layman, anyway.

Xenon-135's huge neutron absorption cross-section and its buildup/decay dynamics create the "xenon poisoning" effect that makes power changes tricky and can even prevent reactor restart after shutdown - a critical aspect of real reactor operation.

FWIW, Xenon was discussed, but it didn't go into enough detail about why Xenon matters and how it can create transients.