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Nucleus meaning

Published by a LexisNexis Energy expert
What does Nucleus mean?
In legal practice involving nuclear regulation, radiological protection and life sciences, nucleus refers to the central part of an atom. It occupies little of the atom’s volume, carries a positive electric charge, and contains almost all its mass. It consists of protons and neutrons: the number of protons (the atomic number) determines the element; isotopes of the same element have the same number of protons but different numbers of neutrons. The term nucleus is not generally defined in UK or Irish legislation or case law; it is a scientific descriptor used across statutes, licences, permits and guidance on nuclear installations, radioactive substances, ionising radiation, medical radioisotopes, export controls and the transport of dangerous goods. Understanding the atomic nucleus underpins legal classifications and controls relating to nuclear fission and fusion, half‑life, criticality, fissile and fertile materials, which in turn inform safety duties, environmental permitting, criminal offences and civil liability. Usage is consistent across England and Wales, Scotland, Northern Ireland and Ireland, though the regulatory frameworks differ (for example, the Nuclear Installations Act 1965 in Great Britain, Environmental Permitting Regulations in England and Wales, and Irish radiological protection legislation).
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NEWS
UK pensions tax: HMRC urges delaying certain benefit payments/transfers as lifetime allowance abolished; interim guidance and retrospective regulations proposed to resolve technical defects

HMRC urges delays amid pension rule changes In a newsletter issued late on 4 April 2024, HMRC advised savers to hold off on certain payments and transfers until issues linked to rule changes are resolved. This covers situations where individuals have enhanced protection with lump sum entitlements above £375,000 (US$472,000). The lifetime allowance — a tax break for pension savings set at just over £1m — will be removed on 6 April 2024. Chancellor of the Exchequer Jeremy Hunt set out the proposals in last month’s spring budget, leaving the tax authority and businesses with a very tight timetable. ‘To indicate at such short notice that people should postpone taking benefits or transferring highlights how poorly these changes have been put into practice,’ said Andrew Tully, technical services director at Nucleus Financial, on 5 April 2024...

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PRACTICE NOTES
Civil nuclear energy in the UK: legal and regulatory overview of the fuel cycle, risks, financing (CfDs/RAB), new build, advanced technologies, fusion, and the 2025 Nuclear Regulatory Review

What is nuclear energy? Nuclear energy is the power released from the core of an atom (the ‘nucleus’). It can be produced in two ways: Fission — the split of a large atom into smaller atoms; Fusion — the joining of lighter atoms to create heavier atoms. Nuclear (fission) power plants split uranium atoms inside a reactor through fission. The heat generated produces steam, which turns a turbine to generate electricity. While fission is currently used commercially to produce energy, nuclear fusion is not yet commercially viable. See: What is the future of nuclear power generation in the UK? below. Various countries around the world are increasingly turning to nuclear energy to satisfy the rising need for clean energy and to strengthen their energy security. What is the nuclear fuel cycle? The set of industrial processes that results in electricity from nuclear reactions is known as the nuclear fuel cycle. It starts with the mining of uranium (or other ores...

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PRACTICE NOTES
EU insolvency harmonisation: 2019 preventive restructuring and Second Chance, the 2026 Directive (pre-packs, avoidance, directors’ duties) and the proposed 'EU Inc' digital fast-track regime

Why harmonisation is needed Divergence across Member States’ laws affects multiple outcomes, notably: the recovery rates available to creditors in different jurisdictions investment choices the restructuring of corporate groups A more consistent EU-level framework would enhance creditor recoveries and the flow of cross-border investment, while also supporting entrepreneurship, employment and innovation. The World Bank has previously produced substantial reports showing that improved insolvency regimes drive greater investment in a country (see Practice Note: Table of advantages and disadvantages of restructuring in various jurisdictions worldwide and News Analysis: Coronavirus (COVID-19)—A nucleus for significant reform), and uneven national frameworks increase costs and create uncertainty when judging the risks of investing in another Member State (as noted by the European Systemic Risk Board (ESRB); see: LNB News 12/05/2025 17). Regulation (EU) 2015/848 (OJ L141 5.6.2015 p 19), the Recast Regulation on Insolvency [EU Recast Regulation on Insolvency], does not seek to harmonise or alter national insolvency rules and procedures, which remain applicable....

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PRACTICE NOTES
EU insolvency harmonisation 2019–2026: preventive restructuring, avoidance actions, pre-packs and directors’ duties—plus 'EU Inc' 28th regime—and the post‑Brexit implications for England and the wider UK

Why harmonisation is needed The lack of alignment across countries’ insolvency regimes influences: creditor recoveries across jurisdictions investment choices, and the restructuring of corporate groups A more consistent framework should not only raise returns to creditors and facilitate cross-border investment, but also support entrepreneurship, employment and innovation. In turn, greater clarity benefits markets and reduces barriers to cross-border investment decisions made by international creditors and investors. The World Bank has, on multiple occasions, produced substantial studies showing that enhanced insolvency legislation stimulates increased investment in a given country (see Practice Note: Table of advantages and disadvantages of restructuring in various jurisdictions worldwide and News Analysis: Coronavirus (COVID-19)—A nucleus for significant reform), and divergences between national frameworks generate higher costs and uncertainty when evaluating the risks of investing in another state (as observed by the European Systemic Risk Board (ESRB); see: LNB News 12/05/2025 17). The Regulation (EU) 2015/848 (OJ L141 5.6.2015 p 19), Recast Regulation on Insolvency [EU Recast Regulation on...

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