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 and safeguards
Import licensing
Regulation of Sensitive Nuclear Information (SNI) in the Supply Chain (List N)
Nuclear safeguards
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
Nuclear site health and safety
Transport of radioactive material
Other regulations/legislations
Sellafield, decommissioning, fuel and waste
Decommissioning, fuel and waste
Sellafield
Related sites
Operational power stations
Current issues
Operational sites/facilites
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 - Meeting one
Expert panel – Regulation of artificial intelligence in nuclear - Meeting two
Key regulatory considerations for the application of blockchain technology in the nuclear sector
Security modelling and simulation software to support risk decision-making
Our research
Our research
PhD projects on human factors within the nuclear industry
Climate change and potential impacts for GB nuclear industry
Seal Ring Groove Wall Debris
Completed research reports
Select committees
Working with others
Working with others
Agreements with others
Agreements with others
Agency Agreements
Agency Agreements with Police Constabularies across England, Scotland and Wales
Memoranda of Understanding / General agreements
Information Exchange Arrangements (IEAs)
Other agreements
International
International
International Convention on Nuclear Safety
Joint convention
International Atomic Energy Agency (IAEA) missions to the United Kingdom
IAEA Integrated Regulatory Review Service (IRRS) missions to the United Kingdom
Convention on the Physical Protection of Nuclear Material (CPPNM)
IAEA International Physical Protection Advisory Service (IPPAS) missions
Other stakeholder groups
Other stakeholder groups
Academia
Government
Public participation
Public participation
NGO Forum
Consultations
Open consultations
Closed consultations
International Atomic Energy Agency draft documents
ONR's responses to consultations
Local Liaison Committee/Site Stakeholder Group reports
Selling to ONR
Selling to ONR
Contract opportunities
Tendering
Working with industry
Careers
Careers
Current vacancies
Meet our people
Our roles
Application and selection procedure
Rewards and benefits
Rewards and benefits
Pension
Diversity and inclusion
Publications
Publications
Publication search
Corporate publications
Corporate publications
Annual Report and Accounts
Corporate Plans
FOI releases
Other corporate publications
Business Impact Targets
Stakeholder Survey Reports
Gender Pay Reports
Policy
Strategies
ONR Strategy
Stakeholder engagement
Research Strategy
Regulatory reports
Regulatory reports
Chief Nuclear Inspector's Annual Reports
Chief Nuclear Inspector's themed inspections
Generic Design Assessment
Regulators' Code
Regulatory policy
Enforcement Policy Statement
Research
Research Reports
Safeguards
Annual civil plutonium figures
Nuclear materials balance figures
Safeguards Annual Report 2024
Site specific reports
Project Assessment Reports
Inspection Records
Quarterly statement of incidents
LLC/SSG reports
Other reports
Review of the J-value literature
IRRS missions
ONR’s regulatory influence on the EPR design in the UK
Fukushima and the UK nuclear industry
Licensing of safety critical software for nuclear reactors
Regulatory guidance
Regulatory guidance
Regulatory inspection
Technical Inspection Guides (TIGs)
Compliance Inspection - 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
Publications
Regulatory guidance
Regulatory inspection
Technical Inspection Guides (TIGs)
Nuclear Safety (TIGs)
NS-INSP-GD-020 - LC20 - Modification to Design of Plant Under Construction
NS-INSP-GD-020 - LC20 - Modification to Design of Plant Under Construction