These companies who signed a memorandum of understandings (MOUs) with Areva, cover a wide range of products and services, including cranes, valves, pumps, piping, tanking and refrigeration units.
In all, the France-based firm had identified 50 British companies with potential capability to meet the scope of the work.
The 25 firms who signed MOUs are pre-qualified, while the other 25 will take part in a pre-qualification process once Areva gets nod from UK-based EDF Energy.
EDF Energy New Build managing director Humphrey Cadoux-Hudson said, "In identifying these 50 UK companies as having the potential to help us deliver the reactors for our proposed new nuclear power station at Hinkley Point C, AREVA has demonstrated the scale of the economic benefits which our project can bring to the UK."
UK Business Minister Lord Marland commented that there are crucial commercial opportunities in the sector which the government will work in partnership with the industry to develop.
"The Nuclear Advanced Manufacturing Research Centre stands ready to work with potential suppliers. And we will be publishing our overarching nuclear industry strategy next year," Marland added.
Areva chief operating officer Philippe Knoche expressed happiness over taking part in the re-birth of the nuclear new build industry in Britain.
"We are committed to making as much use as possible of the UK’s excellent engineering skills in the construction of the EPRTM reactor and to develop these skills further," Knoche added.
