What is an EPR?

EPRs – originally known as European Pressurised Water Reactors – are a type of Pressurised Water Reactor (PWR). The design of the UK EPRs that will be built at Hinkley Point C represents a major development on previous PWRs, making them amongst the safest and most efficient civil nuclear power generators ever designed.

The UK EPR design marks significant progress towards sustainability. It has been designed to use less uranium and produce almost a third less long-lived radioactive wastes compared with water reactors in operation today.

Tailored for the UK

The UK version of the EPR meets the most stringent safety and environmental protection standards, having gone through the UK’s rigorous, four-year Office for Nuclear Regulation (ONR) and Environment Agency (EA) Generic Design Assessment (GDA) process.

Since we want Hinkley Point C to be a world leading nuclear power station, EPR technology is the obvious world leading choice to power it.


The EPR turns the nuclear energy in uranium atoms into electrical energy that can be used in homes and businesses. When the nucleus of an atom is split (nuclear fission), the heat produced turns water into pressurised steam, which turns turbines and generates electricity. (The image shown below is indicative only).


A: Reactor building

B: Four safeguard buildings

C: Fuel Building

D: Nuclear auxiliary building

E: Radioactive waste processing building

F: Emergency diesel generator building

G: Turbine building

H: Power transmission platform

I: Operator building

J: Pumphouse building

K: Outfall structure

L: Conventional electrical building

Key facts and figures

850,000 hours

of engineering studies were part of the rigorous four-year design approval process

17% less

The EPR's large core means it uses 17% less uranium than older technology


separate safety systems in the EPR protect against all hazards, including earthquakes and flooding

Latest news

Report into the collapse of a silo at HPC site
Following an extensive investigation, the cause of the collapse has been identified and the learnings are being shared with our regulator and the wider industry to avoid such an event occurring elsewhere.

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