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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Additional info for Actinide-Only Burnup Credit for PWR Spent Nuclear Fuel Packages
1oo 7 ... . . . _ . . . . I . . . ; 5 yr. Rank * 0 Y Y W V I I \ I 5 10 * 0 : A ' A . I - PU-239 U-238 ". Pu-240 Pu-241 An241---U-236 3r 2 I - . - - . n1 a ............ 3 0 I I 15 I I 20 -+. 25 30 Cooling Time (year) Figure 2-3. 2 ISOTOPIC VALIDATION DATA To ensure the accuracy of any computational tool used to predict the isotopic composition in spent fuel, the tool must be validated against a set of measurements performed on spent fuel samples. These samples should test the capabilities of the computational tool over a wide range of p h e t e r s important to the isotopic changes in the fuel assemblies.
This process is repeated and each time a test is performed to determine whether the value for the respective slope is significant or not. If the trending test indicates the value for the slope associated with burnup is significant, the burnup term is kept in the equation, and Eiq. 2-5 for burnup*spectral index becomes as follow: xfit= 1 + bl*B + b2*B*S The regression procedure, as before, calls for minimizing the following equation. Taking the partial derivative of Eq. 2-10 with respect to b, and setting it equal to zero, yields the following equation.
Table 2-3 represents the range of applicability that can be supported by the data. 1 and is used here. In Table 2-3 the spectral index is given as the Average Lethargy of Absorption (ALA). Any spectral index is acceptable but this is the recommended parameter. Equation 2-2 below defines the ALA. I I I I I I I I I I I I I I I I I I I I I I I I I Eq. 2-2 I I I I I I Where, < for group i ai= the flux of the i* lethargy group Ei = the absorption cross section of the i* lethargy group = average lethargy 2-13 I April 4, 1997 (151pm) I Table 2-3.
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