The nuclear legacy that remains in the United Kingdom (UK) is complex and diverse. Consisting of legacy ponds and silos, redundant reprocessing plants, research facilities, and non-standard or one-off reactor designs, the clean-up of this legacy is under the stewardship of the Nuclear Decommissioning Authority (NDA). Through a mix of prompt and delayed decommissioning strategies, the NDA has made great strides in dealing with the UK’s nuclear legacy. Fuel debris and sludge removal from the legacy ponds and silos situated at Sellafield, as part of a prompt decommissioning strategy for the site, has enabled intolerable risks to be brought under control. Reactor defueling and waste retrievals across the Magnox fleet is enabling their transition to a period of care and maintenance; accelerated through the adopted ‘Lead and Learn’ approach. Bespoke decommissioning methods implemented by the NDA have also enabled the relevant site licence companies to tackle non-standard reactor designs and one-off wastes. Such approaches have potential to influence and shape nuclear decommissioning decision making activities globally, including in Korea.

1. Introduction
2. Sellafield Decommissioning
    2.1 Current Decommissioning Progress
    2.2 Sellafield Decommissioning Prospects
3. Magnox Reactor Decommissioning
    3.1 Waste Inventory & Waste Management
    3.2 Decommissioning Progress: Site CaseStudies
4. Other Facilities
    4.1 Strategy End State
    4.2 Fuel Fabrication & Uranium EnrichmentFacilities
    4.3 Nuclear Energy R&D Facilities
    4.4 Waste Disposal Facilities
5. UK’s Decommissioning Future– Research & Development
6. Implications for the Korean DecommissioningChallenge
    6.1 Decommissioning Similarities
    6.2 Decommissioning Differences
    6.3 Implementation of a Strategic NuclearDecommissioning Blueprint in Korea
7. Conclusions
Acknowledgements
Notes
REFERENCES

• Bum-Kyoung Seo(Korea Atomic Energy Research Institute, 111, Daedeok-daero 989beon-gil, Yuseong-gu, Dajeon 34057, Republic of Korea)
• Keunyoung Lee(Korea Atomic Energy Research Institute, 111, Daedeok-daero 989beon-gil, Yuseong-gu, Dajeon 34057, Republic of Korea)
• June Kyung Park(Korea Atomic Energy Research Institute, 111, Daedeok-daero 989beon-gil, Yuseong-gu, Dajeon 34057, Republic of Korea)
• Richard I. Foster(Nuclear Research Institute for Future Technology and Policy, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea) Corresponding author