Atkins, the UK engineering group, has snapped up a nuclear safety and design consultancy firm based in the US. Nuclear Safety Associates (NSA), which employs 130 people, will come under the Atkins umbrella once the US government approves the deal. No financial terms were disclosed. The acquisition is part of Atkins bid to corner the energy consultancy market. It said the deal would allow NSA to “expand its well established project and client base”.