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Heavy water meaning

Published by a LexisNexis Energy expert
What does Heavy water mean?
In practice, heavy water means deuterium oxide (D2O): water enriched so that it contains far more deuterium (“heavy hydrogen”) than occurs naturally (about 1 in 6,500 hydrogen atoms). It is valued in nuclear engineering because it slows neutrons while absorbing few, and is used as a moderator in certain reactor designs, notably candu-type reactors. The term is descriptive rather than a standalone legal definition, but it is specifically listed for control purposes in export-control legislation. In the UK, heavy water appears on the UK Strategic Export Control Lists under the Export Control Order 2008, engaging licensing for export, transfer, brokering and related technical assistance. In Ireland, controls arise under the EU Dual‑Use Regulation (Regulation (EU) 2021/821). Exports commonly attract Nuclear Suppliers Group and IAEA safeguards conditions of supply. Usage and control concepts are broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, though licensing authorities differ. Heavy water itself is not fissile or ordinarily radioactive. However, when used in reactors it can become tritiated; storage, transport and disposal of tritiated heavy water are regulated as radioactive material/waste and require compliance with nuclear safety and environmental permitting regimes (ONR and the environment agencies in the UK; the Environmental Protection Agency in...
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NEWS
UK and EU life sciences briefing: AI research guidance, UK clinical trials reforms, PFAS impact on medicines, Pharmacopoeia/ATMP updates, device standards, advertising rulings, AstraZeneca v Glenmark SPC injunction

In this issue: Research and development Pharmaceuticals—regulatory framework Advanced therapeutics Commercialisation Medical devices Advertising of medicines Intellectual property Daily and weekly news alerts New and updated content Trackers Useful information There will be no Weekly Highlights on 24 April 2025 Research and development Commission updates guidelines on responsible use of generative AI in research On 10 April 2025, the European Commission’s Directorate‑General for Research and Innovation released the second edition of its guidance on the responsible use of generative artificial intelligence (AI) in research. Targeted at researchers, research organisations and funders, the update complements the EU Artificial Intelligence Act (EU AI act). It details core principles—reliability, truthfulness, respect and accountability—for AI use. The guidance also calls for transparency about the AI tools employed, safeguards for sensitive data and intellectual property rights, and bans heavy reliance on AI in peer review. See: LNB News 10/04/2025 30...

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NEWS
UK CSRB: Data Centres, Managed Services and Critical Suppliers in Scope; Flexible Codes of Practice; Faster Incident Reporting; Higher Fines; and Alignment/Differences with EU NIS2

What is the background to this Bill? The existing NIS Regulations extend across five sectors: transport, energy, drinking water, health and digital infrastructure, and certain digital services, including online marketplaces, online search engines and cloud computing. Oversight sits with twelve regulators (competent authorities) tasked with putting the rules into practice and issuing guidance. The CSRB builds on a series of reviews into how well the NIS framework works, the latest of which took place in 2022. Those consultations found the regime had delivered benefit, but that legislation must evolve quickly to keep pace with a shifting cyber security environment and be widened to bring further categories of providers within scope. At the same time, a string of incidents has hit the NHS, high street names, local authorities and government suppliers, vehicle manufacturers and others, underlining the need to lift cyber security across the UK. Such events impose heavy financial and reputational costs on affected organisations, their users and the wider UK economy, exposing weaknesses spanning public and private spheres...

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NEWS
UK and EU environmental law weekly: climate targets, EPC reforms, nuclear CfDs, EIA screening, enforcement, PFAS/REACH, water and waste—12 March 2026

In this issue: Air emissions and climate change Energy efficiency and buildings Energy for environmental lawyers Environmental assessment Environmental enforcement and prosecutions Environmental information Environmental taxes, reliefs and incentives ESG and sustainability Hazardous substances and chemicals Nature, biodiversity and habitat conservation Waste Water, flooding and drainage Daily and weekly news alerts New and updated content Air emissions and climate change Greenhouse Gas Emissions Trading Scheme Auctioning (Amendment) Regulations 2026 SI 2026/214: These amend the Greenhouse Gas Emissions Trading Scheme Auctioning Regulations 2021, SI 2021/484, updating the auction reserve price for inflation by raising it from £22 to £28, and introducing an automatic yearly uplift from 1 January 2027 linked to the annual GDP deflator. In force from 8 April 2026. See: LNB News 09/03/2026 29. Council of the EU adopts amended European Climate Law with binding 2040 target: The Council of the European Union has approved amendments to Regulation...

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PRACTICE NOTES
GE/Alstom energy businesses merger (M.7278): EU merger control—conditional clearance of heavy‑duty gas turbine overlaps; divestment to Ansaldo; 2017 commitment modifications

Case hub archived — this hub sets out the position as at 18 October 2017, when certain commitments were revised following the 2015 conditional clearance; it is no longer maintained. See the timeline for more information. Case facts Outline of the European Commission’s merger probe into General Electric’s proposed purchase of Alstom’s Thermal Power, Renewable Power & Grid Business (Case M.7278). The deal featured horizontal overlaps in the markets for heavy duty gas turbines. Latest development On 18 October 2017, the Commission approved GE’s request to adjust elements of the decision of 8 September 2015. The agreed changes comprised: an alteration to the list of key personnel revisions concerning Pipeline Projects that relate solely to the activities retained by GE amendments concerning the trade marks to be licensed back to GE Parties General Electric (GE) is a US‑based multi‑national conglomerate operating through divisions including power and water, oil and gas, energy management, aviation, healthcare, transport...

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PRACTICE NOTES
Sustainable Drainage Systems (SuDS): Legal and Planning Frameworks, Adoption and Maintenance, and Due Diligence across England, Wales and Scotland

Introduction to SuDS In natural landscapes, rainfall is caught by vegetation or seeps into the soil, depending on ground conditions, until the soil’s ability to absorb water is surpassed. When that threshold is crossed, surface runoff begins. In commercial or industrial schemes that replace green areas with buildings and hardstanding, interception and natural infiltration are removed or restricted, driving up runoff volumes. Heavy or long-lasting rainfall can therefore create substantial runoff and degrade water quality. Without suitable management this can lead to flooding and pollution, so well-considered drainage design is essential to prevent harm on site and further downstream. SuDS provide an alternative to conventional piped drainage for handling site rainfall run-off and have featured in flood risk policy across the United Kingdom for at least 15 years. The legal basis for SuDS in relation to major developments in England was significantly reinforced by changes to planning law and policy in April 2015. Since that point, government planning policy in England and planning determinations presume SuDS will be adopted...

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PRACTICE NOTES
Subsidence, Sinkholes and Climate Risk: Searches, Insurance, Lending and Planning Issues for Property Lawyers

Introduction to subsidence Subsidence arises when the soil below a building cannot adequately bear its load effectively. It frequently follows loss of moisture and shrinkage in the ground, commonly after extended dry periods. Other forms of ground movement include ‘settlement’ (the normal compression of soil under a property), ‘heave’ (upward lift beneath a structure, often linked to flooding, escaping water or nearby trees near a property) and ‘landslip’ (sideways displacement due to erosion, frequently affecting coastal homes and properties). A range of triggers can set off subsidence and related ground instability issues. These include, among others: human disturbance (e.g. mines, mine shafts, old and disused wells, soakaways, former ice-houses, past storage or refuse pits) altered drainage regimes and patterns intense rainfall and heavy rain removal of groundwater and abstraction impacts of climate change (e.g. rain, drought, erratic weather), an ever more important driver of concern trees Some contend that hydraulic fracturing (‘fracking’) causes land movement. Government restrictions on...

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