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10 17
10 16
Total in 1 tonne of fuel
10 15
10 14
Fission and activation
products
10 13
Actinide and actinide
daughters
10 12
10 11
0.1
1
10
10 2
10 3
10 4
10 5
10 6
10 7
Years after reactor operation
FIGURE 4.10
Level of radioactivity of spent nuclear fuel with a burn-up of 38 MWd/kg U as a function of time after reactor
operation, i.e., after removal from active service. (Adapted from Hedin, A., Spent Nuclear Fuel - How Dangerous
Is It? SKB Technical Report, 97-13, 1997.)
10 4
Actinides and actinide daughters
10 3
Total in 1 tonne of fuel
10 2
10
Activation products
Fission products
1
10 2
10 3
10 4
10 5
10
Years after discharge
FIGURE 4.11
Reduction in decay heat in the spent-fuel canisters in relation to time after removal from operation. (Adapted
from Swedish Nuclear Fuel and Waste Management Company (SKB), Deep Repository for Spent Nuclear Fuel , SR97 -
Post-Closure Safety , SKB Report TR99-06, Main Report, Vol. 1, 1999.)
 
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