physics

Office for Nuclear Regulation

Office for Nuclear Regulation is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Office for Nuclear Regulation rather than just read about it. In short: The Office for Nuclear Regulation (ONR) is the regulator for the nuclear industry in the United Kingdom. It is an independent statutory corporation whose costs are met by charging fees to the nuclear industry.

Key takeaways

Office for Nuclear Regulation belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Office for Nuclear Regulation to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Office for Nuclear Regulation from memory before moving on to harder problems.

Reference excerpt

The Office for Nuclear Regulation (ONR) is the regulator for the nuclear industry in the United Kingdom. It is an independent statutory corporation whose costs are met by charging fees to the nuclear industry. The ONR reports to the Department for Energy Security and Net Zero (DESNZ).

History The establishment of the ONR followed a 2008 review conducted on behalf of the Government into the regulation of the UK civil nuclear industry, recommending the creation of a single industry-specific regulator. The ONR was created on 1 April 2011 as a non-statutory agency of the Health and Safety Executive (HSE), with the Government intending to put the ONR on a statutory basis at a later date. The ONR was formed from the merger of the HSE's Nuclear Directorate (the Nuclear Installations Inspectorate, the Office for Civil Nuclear Security and the UK Safeguards Office) and — from 1 June 2011 — the Department for Transport's Radioactive Materials Transport Team. Legislation to establish the ONR was included in the Energy Act 2013, and it was formally launched as an independent statutory corporation on 1 April 2014. ONR's original mission (as detailed in the DWP/ONR Framework document) was: "To provide efficient and effective regulation of the nuclear industry, holding it to account on behalf of the public". The 2013 Energy Act specified that ONR's five statutory purposes were: Nuclear safety; Nuclear site health and safety; Civil Nuclear security; Nuclear safeguards; Transport of radioactive materials. The ONR is governed by a ten-member board, and is accountable to Parliament through the Department for Work and Pensions (DWP) in matters of finance, governance and non-nuclear health and safety. Nick Baldwin CBE, former chief executive of Powergen (now E.ON UK) was appointed part-time interim chair of the ONR on its formation, resigning as a non-executive director of Scottish and Southern Energy. On 21 February 2019, the Secretary of State for Work and Pensions announced that Mark McAllister would succeed Baldwin as Chair of the Board. Mark McAllister began his five-year appointment as ONR Chair on 1 April 2019. The ONR Board oversees the operation of the Chief Executive Officer (CEO) and the Chief Nuclear Inspector (CNI). John Jenkins, who was CEO from 2013 to 2015, resigned from his post on 28 February 2015 and was replaced by Les Philpott on 1 March 2015 as the Interim Chief Executive. Adriènne Kelbie was appointed Chief Executive and took up the appointment on 18 January 2016. In October 2017 Mark Foy was appointed Chief Nuclear Inspector; he was previously the Deputy Chief Nuclear Inspector. New leadership arrangements commenced on 1 June 2021 which saw Mark Foy become ONR's combined Chief Executive and Chief Nuclear Inspector. Donald Urquhart was appointed Executive Director of Regulation and Sarah High as Deputy Chief Executive. Additionally, Paul Fyfe was appointed as Director of Regulation Civil Nuclear Security and Safeguards, Jane Bowie was appointed as Director of Regulation for New Reactors, Mike Finnerty was appointed Director of Regulation Operating Facilities, Paul Dicks was appointed Director of Regulation Sellafield, Decommissioning Fuel and Waste and Steve Vinson was appointed Technical Director. As of 2021 the ONR had about 650 staff and a budget of £95.05 million, which was largely cost-recovered from users, with a 2% grant from the DWP. In 2025, the government announced the Atlantic Partnership for Advanced Nuclear Energy, which will permit fast-track new reactor design reviews by permitting the ONR and the US Nuclear Regulatory Commission to accept parts of each other's safety assessment, eliminating duplication, aiming to reduce ONR assessment time to about two years. On 1 August 2026, sponsorship of the ONR transferred from the DWP to the Department for Energy Security and Net Zero (DESNZ).

Generic Design Assessment process Following the 2006 Energy review the Nuclear Installations Inspectorate developed the Generic Design Assessment process (GDA), now operated by ONR, to assess new nuclear reactor designs ahead of site-specific proposals. The GDA initially started assessing four designs:

Westinghouse AP1000 Areva EPR CANDU ACR-1000 GE-Hitachi ESBWR However the ACR-1000 and ESBWR were subsequently withdrawn from the assessment for commercial reasons, leaving the EPR and AP1000 as contenders for British new nuclear builds. Assessment of the AP1000 was suspended in December 2011 at Westinghouse's request, awaiting a firm UK customer before addressing issues raised by the assessment. In 2012 Hitachi purchased Horizon Nuclear Power, announcing intent to build two to three 1,350 MWe Advanced Boiling Water Reactors (ABWR) on both of Horizon's sites. The GDA was agreed in April 2013. In August 2014 Westinghouse resumed the AP1000 assessment, after Toshiba and ENGIE purchased NuGeneration and announced plans to develop Moorside Nuclear Power Station with 3 AP1000s. In November 2016 the ONR noted there was a "very large amount of assessment to complete with issues still emerging". On 30 March 2017 the AP1000 successfully completed the GDA process, ironically the day after the designer, Westinghouse, filed for Chapter 11 bankruptcy because of $9 billion of losses from its nuclear reactor construction projects, mostly the construction of four AP1000 reactors in the U.S. On 21 September 2015 Energy Secretary Amber Rudd announced that a Chinese designed nuclear power station was expected to be built at Bradwell nuclear power station. On 19 January 2017 the GDA process for the Hualong One (HPR1000) started, and successfully finished in February 2022. The ABWR GDA process completed successfully in December 2017.

2020 process update In 2020, the GDA process was updated to be more suitable for small modular reactors and advanced nuclear technologies. A three step process was introduced:

Step 1: initiates GDA and agrees scope and timescales, identifying any immediate gaps in meeting regulatory expectations. Step 2: fundamental assessment of the generic safety, security, and environment protection cases, to identify any potential "show-stoppers" that may preclude deployment of the design. Step 3: detailed assessment of the generic safety, security, and environment protection cases on a sampling basis. On 1 April 2022, the GDA Step 1 of the 470 MWe Rolls-Royce SMR started. Step 2 will begin once the timescales and resources have been agreed.

Nuclear defence activities

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Office for Nuclear Regulation

Start with the simplest possible case. Write down what Office for Nuclear Regulation claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Office for Nuclear Regulation before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Office for Nuclear Regulation ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Office for Nuclear Regulation

In research: Office for Nuclear Regulation appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Office for Nuclear Regulation in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Office for Nuclear Regulation is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2011 establishments in the United Kingdom, Department of Energy and Climate Change, Government agencies established in 2011, so understanding it makes those chapters shorter.
In everyday life: Look for Office for Nuclear Regulation outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Office for Nuclear Regulation in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Office for Nuclear Regulation means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Office for Nuclear Regulation out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Office for Nuclear Regulation in simple terms?

Why does Office for Nuclear Regulation matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Office for Nuclear Regulation?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Office for Nuclear Regulation.