Table 6

Example of uncertainties on the reactivity (UOX configuration at room temperature) in pcm due to the nuclear data. The contribution of 1H in H2O comes from the present work. The other contributions were calculated with the covariance data base COMAC [32] developed at the CEA of Cadarache.

Isotopes (n,f) Capture (n,n) (n,n′) (n,xn) Total
1H in H2O   150 71           166
10B   26             26
16O   97 14 2         98
90Zr   11 72 4         72
91Zr   27 30 2         40
92Zr   27 20 2         33
94Zr   2 8 2         8
96Zr   2 6           6
234U 1 6 2           6
235U 104 174 13     276   142 371
236U   1             1
238U 29 165 83 38 18 32 9   195
Total 108 303 137 39 18 277 9 142 470

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