An Office for Nuclear Regulation (ONR) spokesperson said: "Today, we were informed about a fatality at the Hinkley Point C construction site in Somerset following an incident involving a construction vehicle.
"Our thoughts are with the deceased's family, friends and colleagues at this tragic time.
“ONR is on the site and working alongside other relevant authorities.
"ONR is the enforcing and investigating authority on a nuclear licensed site in respect of health and safety.”