Environmental Engineering Reference
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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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