Office for Nuclear Regulation

This website uses non-intrusive cookies to improve your user experience. You can visit our cookie privacy page for more information.

Nuclear site licensing

In order to assure the safety of nuclear installations in the UK, ONR works on a system of regulatory control based on a robust licensing process by which a corporate body is granted a licence to use a site for specified activities.

The nuclear site licence granted by ONR is a legal document, issued for the full life cycle of the facility. It contains site-specific information, such as the licensee's address and the location of the site, and defines the number and type of installations permitted. Such installations include nuclear power stations, research reactors, nuclear fuel manufacturing and reprocessing, and the storage of radioactive matter in bulk.

A set of 36 Standard Conditions, covering design, construction, operation and decommissioning, is also attached to each licence. These conditions require licensees to implement adequate arrangements to ensure compliance.

They are set out in ONR's licence condition handbook.

ONR's guide to 'Licensing Nuclear Installations'

This guide provides an overview of the nuclear regulatory regime and the processes for licensing and delicensing nuclear sites. It has been revised to reflect recent legal changes arising from implementation of the Energy Act 2013.

It explains how and why we licence prescribed nuclear sites. It covers the entire facility life cycle, from the licensing of the new sites through the relicensing of the existing sites to the final delicensing of sites where facilities have been decommissioned and there is no danger to the public. As such, it describes an important and fundamental part of our regulatory work.

Amendments to licence conditions

Updates on changes to licence condition 1 & 3

In October 2014, ONR issued variations to most nuclear site licences to introduce changes to LC3 and definitions in LC1. The principal feature of the new LC3 is that it allows for categorisation of property transactions, according to nuclear safety significance and impact on licensee control, and allows licensees to approve low-risk transactions under their own arrangements. This helps ensure proportionate regulation and makes LC3 more consistent with other licence conditions (LCs 22, 28 and 36). Changes to LC1 include a new definition for 'property transaction' which is used in LC3.

In addition, ONR has modified the definition of 'radioactive material' in LC1 which is linked to the definition provided by the Environmental Permitting Regulations 2010 (in England and Wales). When these Regulations were amended in 2011, previous exemption orders were included in Schedule 23 of the Regulations resulting in possible exclusion of material such as radioactive contaminated land which ONR believes should be covered by nuclear safety regulation, for example.  The slightly modified definition provides clarification with respect to paragraph 9 of Schedule 23 to EPR 2010 and Section 1G of the Radioactive Substances Act1993, given in section 1A of that Act.

This change does not alter ONR's regulatory approach and maintains ONR's position before amendments were made to relevant environmental legislation.

Interpreting Bulk Quantities - Licensability of storage of radioactive matter.

Between September and December 2011, and again between June and July 2012 the Office for Nuclear Regulation (ONR) consulted upon its proposed approach to interpreting "Bulk Quantities" of radioactive matter for the purposes of determining which installations designed or adapted for the storage of radioactive matter require a nuclear site licence under Section 1 of the Nuclear Installations Act 1965 (NIA) and the Nuclear Installations Regulations 1971 (NIR).Taking the results of these consultations into account, ONR published its position statement in December 2012. The key feature of thepositionis that ONR will interpret "bulk quantities" as a quantity of radioactive material equal to or exceeding 100 times the values set out in Schedule 2 of the Radiation (Emergency Preparedness and Public Information) Regulations 2001 (REPPIR)).