Wiktionary
hot reactor
n. (context psychology physiology English) A person whose blood pressure and heart rate increase abnormally in response to stress. (since 1980s)
Usage examples of "hot reactor".
Inspecting industrial atomic piles for the Defense Authority, he had seen awesome demonstrations in which a tiny sample of sodium or aluminum or platinum was cautiously thrust into the hot reactor through an opening in the lead-and-concrete shielding, and came out again as an untouchable mixture of deadly radioactives in which cautious analysis revealed the triumphant traces of man-made magnesium or silicon or gold.
If a hot reactor core had fallen into the water, that gas could be steam.