EDF Energy, who are building two nuclear reactors at the power plant, said the crash occured eight miles away from the site and involved a bus hired to transport its workers.
Ashokkumar Ramasamy, a 27-year-old worker who was taken to Bridgwater Hospital for an operation on his hand, said he felt lucky to be alive.
“I was on the first floor of the double-decker bus – on the right-hand side,” he said. “Suddenly I heard a sound, someone shouting ‘oh my God’, then the bus swerved right and left and then fell down.
“Everyone who works at the station gets the bus, so there were lots of people on it – engineers and workers – everyone.
“It happened in seconds, people were shouting that they were crushed, it was so scary. When it happened I thought I was dead. I feel so lucky that I only broke my hand, that’s it.
“In the moment my mind was blank, I just thought of my wife. I was praying to God that the bus wouldn’t flip more than once. I feel lucky, even though I was in an accident, it could have been worse.”