Final answer:
The subject of this question is Physics, specifically related to nuclear power plants and reactor shutdowns.
Step-by-step explanation:
The subject of this question is Physics, specifically related to nuclear power plants and reactor shutdowns. In this case, the question refers to an incident involving the Brown's Ferry Nuclear Power Plant. The plant had to shut down a reactor after two water recirculation pumps failed, causing the controllers for the pumps to lock up following a spike in data.