Reed college is having an open house today and doing 2 tours through their nuclear reactor. 
You get to enter the reactor room while it is running at 90% of it’s 250 kwatt output (they turn off the lights so you can see the Cerenkov blue glow!) – and then they scram it for you (shutdown). Sadly, they use a magnetic control rod system – so there isn’t really a guy with an ax anymore…