# Peter Lux

## Spent Fuel At Sizewell B

This is my calculation of the amount of spent fuel at Sizewell B. It is not that accurate (estimate 20% either side) but should give us a rough idea

 Electrical Output 1258 MWe Wikipedia gives 62MW used internally. However this figure gives 67MW since BE state power rating at 1191 Thermal Efficency 36.5% Thermal Power 3444 MWth Wikipedia value 3.44 GWth Total maximum energy per year 1257 GWdays Load Factor 87% Average over lifetime (wolfram alpha) � does not include 2010 Total energy actually produced 1093.64 GWday Electrical Output 9587.47 GWhours Just a check � this is 9.6TWhours which is reasonable if you include the internal electrical consumption (less than 1% out) Burnup 33 GWday/TU The characteristics of LWR fuel at high burnup and their relevance to AGR spent fuel NNL (10) 10930 Issue 2 Spent Uranium 33.14 T Amount of Uranium used every year U238 Atomic Mass 238 UO2 molecular mass 270 Spent Fuel 37.6 T UO2 Amount of UO2 used every year

So the amount of spent fuel is 30 – 45 tonnes per year. Greenpeace estimated 220T in 2002. This calculation would give 225T for 2002.

By 2011 this would give 564T.

By the end of 2035 it would give 1466 tonnes.

Assuming that they use VSC-24 casks

 Mass of U per assembly 461.4 Kg U atomic mass 238 g U02 Molecular Mass 270 g Mass of UO2 per assembly 523.44 Kg Mass of U per cask (24 per flask) 12562.5 Kg per cask Mass of U per cask (24 per flask) 12.56 TUO2 per cask

### One Response to “Spent Fuel At Sizewell B”

• Pete says:

Email from EDF states that they are planning 146 casks.
Dear Peter

Thank you for your telephone call enquiring about the number of casks and the number of fuel assemblies that will be stored at the end of life in the Dry Fuel Store at Sizewell B power station.

The Dry Fuel Store has the capacity to take 146 casks.

I have made enquiries to determine if there are restrictions in terms of a reply to your question on the number of fuel assemblies – “Under the classification policy for the use, storage and transport of nuclear and other radioactive material issued by the Office for Nuclear Regulation (Civil Nuclear Security), this information is classified and, as this is so, cannot be released to the public”. The law which underpins this guidance is The Nuclear Industries Security Regulations 2003 (as amended) and the Anti-terrorism, Crime and Security Act 2001.

Thank you

Niki

Niki Spatchett
Communications & Community liaison officer
Sizewell B Power Station, EDF Energy
Leiston, Suffolk
IP16 4UR