Application of the AFCI-1.3 Covariance Data to Uncertainty Evaluation of Fast System Integral Parameters

摘要

In summary, the AFCI-1.3 data yield much smaller contributions of the cross sections of Pu-240, Pu-241, and Pu-242, compared to BOLNA and AFCI-1.2. Inrnparticular, the fission cross section uncertainty in AFCI-1.3 for Pu-240 and Pu-241 is evaluated to be <1%, i.e., comparable to the evaluated uncertainty in the U-235 fission cross section. On the contrary, both AFCI-1.2 and AFCI-1.3 data show much larger contributions of Pu-238 fission cross section than BOLNA. For Am-242, Cm-244 and Cm-245 fission cross sections, no changes are observed from the AFCI-1.2 to AFCI-1.3.