By United States. Dept. of Energy. Yucca Mountain Project Office.; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information

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**Extra info for Actinide-Only Burnup Credit for PWR Spent Nuclear Fuel Packages**

**Example text**

RUDraft 2-18 March 31, 1997 (4:29pm) x, = 1 + bl*B + b2*B*S + b3*B*E Eq. 2-12 As before, in order to determine b,, the sum of the squares of the residuals which is: (xi-1-b, *Bi-bz*Bi*Si-b3*Bi*EJ2 Eq. 2-13 .. is rmtllflllzed by setting the partial derivative of Eq. 2-13 with respect to b, to zero. This results in the following equation for 4. I I I I I I I I I I I The trending test formula for b, is again similar to Equation 2-8 for testing b,; but with replacement of the appropriate parameters, which in this case are b3 and Bi*Ei.

Taking the partial derivative of Eq. 2-10 with respect to b, and setting it equal to zero, yields the following equation. I ~ I I I I I I I I . Eq. 2-11 As before, the trending test is applied to b,. The trending test formula for bz turns out to be similar to Equation 2-8 for testing b, except b, and Bi are replaced with b, and Bi*S,. Again, if the trending test indicates the value for the slope associated with burnup*spect:ral index is significant, the burnup*spectral index term is kept in the equation, and Eq.

Ium supplemental absorber materials). Package designers should confirm that the generic reference set covers the significant criticality control package design features prior to applying the UO, subset without modification. 2 U0,-Gadolinium Critical Experiments Spent fuel contains significant neutron absorbing isotopes that result in "hardening" of the neutron spectrum relative to nuclear fuel systems containing fresh fuel only. The spectrum hardening, or the increase in average neutron energy, results from increased competition for thermal neutrons within the system due to the presence of fission product and higher order actinide neutron absorbers, which are not present in fresh fuel systems.

### Actinide-Only Burnup Credit for PWR Spent Nuclear Fuel Packages by United States. Dept. of Energy. Yucca Mountain Project Office.; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information

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