Energy companies are in the process of building new nuclear power stations across the UK, with the first new reactors expected to be operational in the mid-2020s.
The UK currently has 15 reactors with a total generating capacity of 10 gigawatts of electricity (GWe), operated by EDF Energy. These stations generate around a fifth of the UK’s electricity – yet all but one is scheduled to be retired over 2023–30. The exception is Sizewell B, the UK’s only pressurised water reactor (PWR), which began operations in 1995 and is scheduled for decommissioning in 2035.
Four reactor designs have been or are being formally considered for UK new build: the Framatome EPR (originally the Areva European Pressurised Reactor), Westinghouse’s AP1000, Hitachi-GE’s Advanced Boiling Water Reactor (ABWR), and the Chinese Hualong HPR1000.
Both the EPR and AP1000 are generation III+ PWRs, offering a range of safety, economic and operational improvements over previous designs.
The EPR has an output of 1600MWe. Four EPRs are under construction in Finland, France and China, with the first in China entering commercial operation in late 2018.
The AP1000 has an output of 1150MWe. AP1000s are under construction or operational at two sites in China (with first generation in 2018) and two sites in the US.
Both the EPR and AP1000 have completed a generic design assessment (GDA) by the Office for Nuclear Regulation (ONR) and Environment Agency. This assessment is intended to support the construction of a number of new nuclear power stations by approving a standard reactor design which can be built in different locations by different developers. Each build will still require a site-specific licence.
The Hitachi-GE ABWR is a significantly different design to the Areva and Westinghouse PWRs, operating at lower pressures and temperatures but requiring much larger pressure vessels. The 1300MWe ABWR completed GDA in December 2017. Four ABWRs are already in operation in Japan.
The 1170MWe Hualong HPR1000 is a generation III PWR, currently being deployed at three sites in China. It completed the second phase of GDA in November 2018, with CGN aiming for approval around 2022.
See the ONR’s GDA pages for the latest information.