Office for Nuclear Regulation

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Emergency planning areas around UK nuclear installations

Where there is a potential for the public to be affected by a reasonably foreseeable radiation emergency, emergency planning areas are designated. ONR determines the area based on two principles:

ONR uses the term REPPIR offsite emergency planning area to identify the area around a nuclear site where the local authority has to have a plan for protecting the public in the event of an offsite emergency. DEPZ has been used to define different areas by different stakeholders. To ensure that all stakeholders understand that the area that ONR is determining is that required by REPPIR Regulation 9(1), we are using language that refers to the relevant legislation.

Further information

Current emergency planning areas around UK sites

Nuclear site Radial distance (km) or map
Aldermaston 2km to 3.5km
Amersham No off-site emergency planning area
Barrow Part of Barrow-in-Furness and all of Walney Island 
Berkeley No off-site emergency planning area
Bradwell No off-site emergency planning area
Burghfield 1.5km
Capenhurst 1km
Cardiff No off-site emergency planning area
Chapelcross No off-site emergency planning area
Clyde Operational Berth 1.5km
Devonport (DRDL and HMNB) Approx. 1.5km to 2.5km from the sites 5 basin and around Plymouth Sound submarine berths
Dounreay 1.15km
Dungeness A No off-site emergency planning area
Dungeness B 2.4km
Faslane Operational Berth 1.5km
GE Healthcare No off-site emergency planning area
Hartlepool 1km
Harwell No off-site emergency planning area
Heysham 1 & 2 1km
Hinkley A No off-site emergency planning area
Hinkley B 3.5km
Hunterston A No off-site emergency planning area
Hunterston B 2.4km
Imperial College No off-site emergency planning area
Lillyhall - Cyclife Uk Ltd No off-site emergency planning area
Loch Ewe Operational Berth Approx 1.5km from the berth including properties in Tighnafiline and Badfearn
Loch Goil Operational Berth 1.5km
Low Level Waste Repository (LLWR) Drigg No off-site emergency planning area
Oldbury 1km
Portland Operational Berth Approx 1.5km from the Berth, including Castletown and Fortuneswell
Portsmouth Operational Berths Three areas of approx 1.5 radii, including parts of Portsmouth and Gosport
Rolls-Royce Marine Power Operations Limited, Derby Based on a radial distance of 500 metres
Rosyth No off-site emergency planning area
Sellafield Approx 6-7km from the site
Sizewell A No off-site emergency planning area
Sizewell B Approx 2-3km from the site (based on post code boundaries)
Southampton Operational Berth Approx 1.5km from the Berth, including parts of Southampton and Hythe
Springfields Up to 1.4 km from the site
Torness 3km
Trawsfynydd No off-site emergency planning area
Winfrith No off-site emergency planning area
Wylfa Up to 2.5km from the site, including Tregele and Camaes

Offsite emergency planning areas - Project Assessment Reports (PARs)

The size of the emergency planning area differs site by site in the UK, with due consideration given to individual factors associated with each site. Following the publication of ONR's revised principles (January 2014), ONR commenced revision of the offsite emergency planning areas to defined maps.