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Advice for people living around Sizewell

An incident at Sizewell power station may cause an increased risk to public health and require specific countermeasures to be put into place by the emergency services.

A range of information has been produced to help you understand what might happen if an incident occurs.

Suffolk County Council lead on the planning for an off site incident at Sizewell B.  This plan is written in accordance with the Radiation Emergency Preparedness and Public Information Regulations 2001 (external web site).  The public version of Sizewell Off Site Emergency Plan (pdf, 3.1 MB) sets out the multi-agency strategic and tactical management arrangements for dealing with a nuclear emergency (i.e. an incident with off site radiological implications) at Sizewell B Nuclear Power Station. 

What to do before an incident

If you live within the Sizewell Detailed Emergency Planning Zone (DEPZ) 3 - 4kms from Sizewell B Power Station - see Sizewell DEPZ map (external website), you will be issued with information on:

  • Immediate Actions to take when warned of a nuclear incident;
  • Consumption of food and water;
  • Stable Iodine tablets, if appropriate;
  • Pets & livestock;
  • Location of Rest Centres;
  • Contact information for:
    • Sizewell B Station: 01728 653653
    • Sizewell A Station: 01728 633300
    • Suffolk Joint Emergency Planning Unit: 01473 265321

EDF Energy provides public information to local residents living within the Detailed Emergency Planning Zone on emergency planning arrangements around the Sizewell nuclear power station. 

Operators Prior Information:

  • People living within 1 km of the Sizewell nuclear site will receive the 2018 calendar information (pdf, 1.4 MB)
  • People living beyond 1km within the DEPZ receive a letter (pdf, 278 KB)

Other documents that are provided to people living around the Sizewell nuclear sites are reproduced below to allow people to access them:

Advice to specific groups

What to do during an incident

  • Living within the Sizewell DEPZ - follow the direction given to you via telephone warning.
  • If you do not receive a telephone warning listen to local radio for further information.
  • Information on any radioactive contamination and what you should do to protect yourself will be issued via local radio/TV. 
  • Living outside of the Sizewell DEPZ - listen to local radio and follow any guidance provided.
  • Use the listed contacts to confirm what you should do if in doubt.

What to do post-incident

Once any release of radiation from Sizewell power station is brought under control, local emergency services will work quickly to provide information on where you can safely go and where any restrictions might be in place.

A Community Information Point will be established by the local authorities in communities that might be affected by any accident to provide a local point of contact and to help the community recover.

Determining the Sizewell Detailed Emergency Planning Zone

Suffolk County Council is now required under Radiation (Emergency Preparedness & Public Information) Regulations (REPPIR) to determine the Sizewell Detailed Emergency Planning Zone (DEPZ). 

The previous DEPZ was set by the Office for Nuclear Regulation in 2014; justification can be found in the ONR report setting out the background to the new DEPZ (external website). 

The new DEPZ was agreed by Suffolk County Council Cabinet on 5 November 2019; justification can be found in the Cabinet paper Agenda Item 10  (external website) and is based upon the recommendations contained within the EDF Energy Nuclear Generation Consequences Report and formal advice from Public Health England, Centre for Radiation, Chemicals and Environment.

Consequences Report - EDF Energy Nuclear Generation (operator of Sizewell B nuclear power station) is required to assess potential hazards from working with ionising radiation which have the potential to cause a radiation emergency.  This information is used to evaluate a full range of consequences of such a radiation emergency and the conclusions of this evaluation are provided to Suffolk County Council in a Consequences Report.  Consequences Report for Sizewell B nuclear power station (pdf, 635 KB)

PHE Advice - PHE provided input to the guidance on how to calculate the distances for the emergency planning area around nuclear site based on a standardised methodology. In line with this methodology, PHE has reviewed the Sizewell B consequences report and has agreed with the assumptions contained within it.  For further information see PHE advice on SZB Consequences Report  (pdf, 818 KB)

The owners of the Sizewell A site, Magnox, are no longer required under REPPIR to conduct a hazard assessment and there is no Consequences Report for this site.


Suffolk Resilience Forum consultation report on proposals for changes to Sizewell Off Site Emergency Plan - January to April 2013

See the full report on the consultation  (pdf, 100 KB) and the response to comments made during the public consultation. (pdf, 69 KB).

Sizewell C

The EDF Stage 1 consultation closed on 6 February 2013, as a statutory consultee the Suffolk Resilience Forum submitted the following comments. (pdf, 38 KB)