Office for Nuclear Regulation

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Nuclear Materials Balance – 2010/11

4 January, 2012

Material unaccounted for (MUF) figures for civil nuclear material were published annually from 1977 onwards by UKAEA on behalf of the UK nuclear industry. Changes in the structure of the industry which followed from setting-up the Nuclear Decommissioning Authority (NDA) meant that figures for 2004/5 and 2005/6 were published, on behalf of the industry, by the then DTI. The transfer in April 2007 of operational aspects of the work of the UK Safeguards Office (UKSO) from DTI to the HSE means that the figures for 2006/7 onwards are published, as a matter of routine, on the HSE website.

Inventory differences (‘Material Unaccounted For’) at UK Civil Nuclear sites in 2010/11

Site Plutonium kg 1 HEU kg U-235 2 LEU t U 3 Natural U t U 3 Depleted U t U 3
Dounreay +0.057 +0.537 +0.002 NIL +0.005
Harwell +0.050 +0.006 <+0.001 <-0.001 <+0.001
Windscale 4 NIL NIL -0.011 -0.015 NIL
Winfrith <+0.001 <+0.001 <+0.001 <+0.001 <+0.001
Sellafield +4.410 -0.005 +0.177 <+0.001 -5.575
Capenhurst (Sellafield Ltd) 5 NIL NIL +0.188 -0.001 -0.009
Springfields NIL NIL +0.540 +38.602 +1.455
Urenco Capenhurst 7 N/A NIL |<———— (-0.249) ————>|

+ apparent increase
- apparent decrease

1 the figures for plutonium are the total amount of all plutonium isotopes.
2 the figures for highly enriched uranium (HEU) are for the uranium 235 content of uranium enriched to above 20% of that isotope.
3 low enriched uranium (LEU), natural uranium and depleted uranium cannot be used to make explosive devices. The published figures include these grades of material for the sake of completeness.
4 for which Sellafield Ltd became the site licensee on 1 April 2008
5 operated by Sellafield Ltd
6 the figure for Urenco Capenhurst is a consolidated figure for Urenco UK Ltd and Enrichment Technology UK Ltd

Contacts

  • Dounreay, Colin Punler 01847 806160
  • Harwell, Angela Vincent 01235 435234
  • Winfrith, Angela Vincent 01235 435234
  • Sellafield/Windscale, John Reynolds 019467 85848
  • Springfields, Alan Beauchamp 01772 762841
  • Sellafield Ltd Capenhurst, Stephen Barnes 01925 833249
  • URENCO Capenhurst, Neil Fagan 0151 473 4240