EDF Energy

About the company

Sizewell B is the UK’s only Pressurised Water Reactor (PWR) and also the most modern nuclear power station in the UK.

The 'nuclear island' at Sizewell B is based on a Westinghouse '4-loop' plant known as SNUPPS (Standard Nuclear Unit Power Plant System) initially designed in the 1970s and used at Wolf Creek and Callaway but with additional redundancy and diversity in the safety systems, and other modifications such as the addition of a passive Emergency Boration System. The containment design was not based on SNUPPS however but was designed by NNC (National Nuclear Corporation – bought by Amec Foster Wheeler in 2005) in conjunction with Bechtel.