Table 4: Uncertainty in in GEN-III unit cells.

FuelCompositions Uncertainty in (%   )Largest uncertainty-contributing reaction

MOX9.8%  239Pu1.09210.94 238U( )
6.5%  239Pu1.05400.97 238U( )
3.7%  239Pu1.01150.99 238U( )

UOX4.2%  235U1.24310.51 238U( )
3.2%  235U1.17410.54 238U( )
2.1%  235U1.04900.59 238U( )

UOX-Gd2O32.2%  235U0.21661.79 238U( )
1.9%  235U0.19971.94 238U( )