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.

Casks

Assuming that they use VSC-24 casks

Mass of U per assembly

461.40

Kg

U atomic mass

238.00

g

U02 Molecular Mass

270.00

g

Mass of UO2 per assembly

523.44

Kg

Mass of U per cask (24 per flask)

12562.49

Kg per cask

Mass of U per cask (24 per flask)

12.56

TUO2 per cask

 

This gives a figure of about 117 casks

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One Response to “Spent Fuel At Sizewell B”

  • Pete 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


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