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Home | Office for Nuclear RegulationThe ONR site home pageHome | Office for Nuclear Regulation Skip to content About us About us Who we are Who we are Our Board Meetings Expenses Governance ONR Committees Audit and Risk Assurance Committee (ARAC) Remuneration and Resilience Committee Security Committee Regulatory structure Technical Directorate Our role Our role Frameworks Legal framework Organisational Effectiveness Indicator (OEI) framework Risk management Contact us Contact us Whistleblowing, concerns and complaints Report a concern Complaints Make a protected disclosure to ONR Freedom of Information (FOI) Releases of information Notify ONR News News Newsletter Social media Events Our work Our work Map of sites and facilities What we regulate What we regulate Civil nuclear security Import licensing Regulation of Sensitive Nuclear Information (SNI) in the Supply Chain (List N) Defence Defence sites Propulsion Weapons Working with the Ministry of Defence New reactors Construction Advanced Nuclear Technologies (ANTs) Generic Design Assessment Licensing of new reactors Hinkley Point C Sellafield, decommissioning, fuel and waste Decommissioning, fuel and waste Sellafield Related sites Operational power stations Current issues Operational sites/facilites Nuclear safeguards IAEA safeguards Nuclear materials balance QNFLO reporting under Nuclear Safeguards (EU Exit) Regulations 2019 Transport of radioactive material Nuclear site health and safety Other regulations/legislations How we regulate How we regulate Nuclear site licensing New site licensing Relicensing Delicensing International Safety Standards (IAEA) Enforcement Regulatory reports Our regulatory charges Emergency arrangements Emergency arrangements Local emergency arrangements National emergency arrangements ONR’s role in a radiation emergency Public communications in an emergency Climate change Climate change Guidance Working with the UK's environment agencies Frequently asked questions Our expertise Our expertise Our specialists Expert panels Expert panels ONR Expert Panel on Natural Hazards Natural hazards panel biographies Graphite Technical Advisory Committee Chief Nuclear Inspector's Independent Advisory Panel CNI Panel members Regulation of artificial intelligence in nuclear Innovation Innovation Artificial Intelligence Innovation pathways Case studies in innovation Expert panel – Regulation of artificial intelligence in nuclear - 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Operational Experience Guidance Regulatory assessment and permissioning Technical Assessment Guides (TAGs) Investigations and enforcement Assessment Safety Assessment Principles (SAPs) Security Assessment Principles (SyAPs) Other guidance Report a concern Welcome to the Office for Nuclear Regulation We are the UK’s independent nuclear regulator for safety, security and safeguards. Our mission is to protect society by securing safe nuclear operations. Latest news New nuclear security training initiative to enhance industry expertise New nuclear security training initiative to enhance industry expertise 15 May 2025 We are partnering with Global Nuclear Security Partnership (GNSP) and Ubique Risk Management (URM) to develop specialist nuclear security training for Great Britain’s nuclear industry.  Read more ONR's Interim Strategy Statement ONR's Interim Strategy Statement 14 May 2025 The Office for Nuclear Regulation (ONR) has published its Interim Strategy Statement, bridging the gap between its current 2020-2025 Strategy and the forthcoming Strategy 2030. Read more NNB Generation Company (HPC) Limited served with improvement notice NNB Generation Company (HPC) Limited served with improvement notice 12 May 2025 We have served an improvement notice after the failure of components on a tower crane were identified by an operator at the site in Somerset. Read more Our People – Elspeth McGregor, Nuclear Safety Inspector   Our People – Elspeth McGregor, Nuclear Safety Inspector   9 May 2025 Meet Elspeth McGregor and learn more about her role as a Nuclear Safety Inspector and chemistry specialist within our New Reactors directorate. Read more More news Sites and facilities we regulate We deliver five statutory purposes to ensure safe nuclear operations now and in the long term. We have the legal authority to regulate nuclear safety, nuclear security and conventional health and safety at the 36 licensed nuclear sites in Great Britain. This includes the existing fleet of operating reactors, fuel cycle facilities, waste management and decommissioning sites, as well as licensed and, in part, authorised defence sites, together with the regulation of the design and construction of new nuclear facilities, including the supply chain. Map of sites and facilities Working for ONR Discover more about our roles Our work calls for a high level of expertise and a wide range of disciplines All the technical skills found in any engineering based industry can be found in ONR, as well as reactor physics, radiological protection and a number of specialised areas. We are also supported by a corporate centre comprising of administrative public servants who are vital to the effective operations of ONR. Find out more about working for ONR Our inspection records Inspection records are written by our inspectors following visits to the sites and facilities that we regulate They are used to record findings and, if appropriate, any significant actions we require the site operator to carry out in order to improve matters. Publishing executive summaries of these reports is one part of our aim to be open and transparent by helping all of our stakeholders, including the public, understand our work. Inspection Records Our regulatory guidance Looking for Technical Assessment or Inspection Guides? TIGs/TAGs We are committed to providing up to date, open and transparent content relating to our current internal instructions and guidance used to carry out our core operational work. Regulatory guidance Generic Design Assessment (GDA) Joint regulators Alongside the Environment Agency, ONR developed the voluntary Generic Design Assessment process in response to a request from the Government following its 2006 Energy Review. We will not issue permits for new nuclear power stations unless a design and its potential operators meet the high safety, security, safeguards and environmental standards that we require. Generic Design Assessment Access to information Accessibility, privacy notice, copyright, languages/translations and publication scheme information. Learn more Contact us Find out how to get in touch with the Office for Nuclear Regulation including whistleblowing and health and safety concerns. See how to contact us Sign-up to our free email newsletter Newsletter signup Subscribe Twitter LinkedIn YouTube Updated: 3 April 2025enenhttps://onr.org.uk

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