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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

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 35 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.

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.

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.

Our regulatory guidance

Looking for Technical Assessment or Inspection Guides?


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.

Generic Design Assessment (GDA)

Joint regulators

Alongside the Environment Agency, ONR developed the 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.