noun
nuclear engineering
Academic and professional field covering nuclear reactor design, radiation applications, and nuclear fuel cycle.
彼は大学で原子力工学を専攻している。
He is majoring in nuclear engineering at university.
原子力 means 'nuclear power' or 'atomic energy' broadly, while 原子力工学 specifically refers to the engineering discipline.
Compound of 原子力 (nuclear power) and 工学 (engineering).