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nureg/cr-6700 - Oak Ridge National Laboratory

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Radiation Shielding Section 5<br />

1<br />

Relative Spontaneous Fission Source<br />

0.1<br />

0.01<br />

cm244<br />

cf252<br />

cm246<br />

pu240<br />

pu242<br />

pu238<br />

cm248<br />

cf250<br />

cm242<br />

u238<br />

0.001<br />

0 20 40 60 80<br />

Burnup (GWd/t)<br />

Figure 20 Relative importance of the dominant spontaneous fission actinides for 5-wt % PWR fuel,<br />

5-year cooling<br />

42

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