druray

Decades ago, I attended a nuclear engineering course at Hinkley (or perhaps Oldbury - both power stations with gas-cooled magnox reactors.) I recall being told that the reactor had a slightly positive thermal reactivity coefficient. It had an automatic control system that did not work well, so they operated it manually. There was a simulator for training, run at 10X real time, and we all got to try our hand. It was not difficult, even at the sped-up rate.

There were multiple automatic safety systems ready to stop anything bad happening if the operators somehow lost control of it.