Dr Paul Dorfman Nuclear Consultation Group Helsinki, 8 May 2009 High Burn-up Radioactive Spent Fuel.

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Presentation transcript:

Dr Paul Dorfman Nuclear Consultation Group Helsinki, 8 May 2009 High Burn-up Radioactive Spent Fuel

Rad waste – US experience Obama withdraws funding from Yucca Mountain geological rad waste dump ‘After spending billions of dollars on the Yucca Mountain Project, there are still significant questions about whether nuclear waste can be safely stored there’ – Barack Obama, Feb 2009

UK rad waste experience Current legacy - 75 billion sterling CoRWM 1 – deep disposal concept subject to intensive research and development To date very limited R & D undertaken Rhetoric of deep disposal Until then - surface storage

Prof Andy Blowers OBE, Open University, member of NIREX, member of Committee on Radioactive Waste Management 1 (CoRWM) ‘There is, as yet, no proven technical solution for the long-term management of radioactive wastes’

Rad waste – French experience after 15 years of inconclusive research on deep underground burial, the failure to find a solution led the French parliament to authorize continuation of research on disposal and on long-term storage of the wastes

Liberalisation of the energy market in Europe Pressured Electricité de France (EDF) to become more competitive Resulted in the testing of high burn-up fuel European Pressurised water Reactor (EPR) ‘re-engineered’

EdF ‘Optimization’ study Decrease in cost could be achieved if: 1.15% increase in the reactor’s power 2.Fuel was enriched to up to 4.9% uranium235 3.Spent fuel discharged at a burn-up of 60,000 MegaWatt days per tonne of Uranium (MWd/tU)

High burn-up fuel More enriched uranium used as reactor fuel to increase burn-up rate Left in the reactor for longer High burn-up spent fuel is hotter and more radioactive than conventional spent fuel Much tighter ‘safety envelope’

Burn-up rate AGR burn-up MWd/tU - 5, ,000 EPR burn-up MWd/tU - 45, ,000

Spent fuel pools KW sq m at 5 yrs: AGR – 10.8 EPR – 17.2

Risk Implications High burn up increases risk of radioactive releases as the fuel cladding gets thinner Increased risk persists throughout storage and disposal Hotter and more radioactive Take up much more space in any store

Conclusions Disposal of spent fuel in deep underground repositories is unproven No experience of high burn-up fuel stored over very long periods Degradation of high burn-up fuel elements over very long storage periods is certain Retrieval, encapsulation, emplacement cannot be assumed to be possible - let alone safe

Very little experience of spent fuel over 60,000MWd/tU Containment materials after cooling pond are still experimental Decades additional cooling time Spaced out in repositories - increasing ‘footprint’ Uncertainties about high burn-up spent fuel - any fixed disposal cost exposes future taxpayer to huge liabilities

Driven by financial constraints Nuclear industry has raised the power output of proposed reactors Difficulties of managing and disposing radioactive waste are becoming insuperable Burdens of cost, effort, worker radiation dose transferred to future generations