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Safety events reported to the Nuclear Safety Regulator to date, for both Sizewell A and Sizewell B

Date released
12 June 2024
Request number
202405014
Release of information under
Freedom of Information Act 2000 (FOIA)

Information requested

We refer to the recent (29.4.24) publication of ONR Project Assessment Report “Proportionate reassessment of an application by I’d like to request a summary of all safety events reported to the Nuclear Safety Regulator to date, for both Sizewell A and Sizewell B. It may be that some of the information is covered in this pdf on your site, but the link is broken. Perhaps you can advise.

Information released

We confirm that under s.1 of the FOIA, we hold the information you have requested. However, due to the broad nature of your request, the age of the sites in scope, the volume of information requested, and the way in which the information is held on our systems, gathering it together is likely to take us beyond the appropriate limit set by the government. We are therefore refusing your request under s.12 of the FOIA, requests where the cost of compliance exceeds the appropriate limit.

Please note, the pdf link referenced in your request was deleted from our website in May 2023 following a content review. The pdf was entitled ‘Events reported to the Nuclear Safety Regulator in the period of 1 April 2001 to 31 March 2015’ and I can confirm that this did not contain any information pertinent to your request.

Further information

We try to be as open as possible when answering requests for information, and would welcome you to refine your request to bring it within the appropriate limit. Under our duty to provide advice and assistance under s.16 of the FOIA, we suggest that you may wish to view the following publications on our website:

  • Inspection records - these reports detail the outcomes of compliance inspection activities undertaken by ONR inspectors across all ONR’s purposes; and,
  • Quarterly Site Stakeholder Group (SSG) reports - these are provided to local community groups for sites regulated by ONR.

Five years of Inspections records and SSG reports can be found on the following site specific webpages, along with the latest site news and other related publications:

Further information on incident notification can also be found at the following link:

Further information on events at a nuclear licensed sites within Great Britain that met the Ministerial Reporting Criteria (MRC) as defined within the Nuclear Installations (Dangerous Occurrences) Regulations 1965 can be found at the following link:

Once you have reviewed this information, and should you wish to narrow your request, please contact us via the email address contact@onr.gov.uk, quoting reference: FOI202405014. Any reformulated request will be treated as a new FOI request.

Please note that in accordance with s.1(3) of the FOIA we are not under any further obligation to respond until you have provided the appropriate refinement.

Exemptions applied

s.40

PIT (Public Interest Test) if applicable

N/A