Download Actinide-Only Burnup Credit for PWR Spent Nuclear Fuel by United States. Dept. of Energy. Yucca Mountain Project PDF

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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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3- 11 Ref. 52-in. 56-in. 5641. 735-in. 792-in. pitch Ref. 3-12 Ref. 3-12 Ref. 3- 12 Ref. 3- 12 Ref. 3-12 Ref. 386-in lattice spacing Ref. 3-14 Ref. 3-14 Ref. 3-14 Ref. 3- 14 Ref. 3-14 Ref. 32-in lattice spacing Ref. 3-14 Ref. 3-14 Ref. 3-14 Ref. 0009 March 30,1997 (257pm) I I I I I I I I I I I I I I I I Table 3-1. Critical Benchmark Experiments for Burnup Credit Method Validation with CSAS/27BURNUPLIB Calculated Results (Continued) I Experiment Case Enrichment U-235 Description Original Reference' (Wt %) I I I I I I I I I I I PUP I PUP I I I I I I UOJFQO, triangular I I I I I Lattice NaterFuel Volume ALA' kat std.

I 1 I i I C I ! I i ! I I I I ; 4235ei 1 269FcrP4 I 3 29RCc01 I 783OCi01 I I 2 I 23RdeiO ! B2Oe+02 -- 187~42 C Calculatcrl value M hleasured value 'Height of sample above bottom of fuel N i h Nor Applicable. Isotopic measurements were perfmned by assaying full length halves of fuel - 2-9 March 1997 I I I I I I Since almost all the Am-241 in SNF with at least five years cooling tirne comes fnom post irradiation decay of Pu-241, the predicted Am-241 values will be biased based on Pu-241 measurements.

O). This would ensure that the maximum amount of positive worth isotopes is included in the criticality calculations. O+r”, bj*f$+t95,n-m Eq. 2-20 The comtion factors for negative worth, non-trended isotopes are calculated by subtracting the total uncertainty from the bias term represented by a linear equation. The conservative assumption on disallowing any compensating effects is considered by setting the correction factor equal to unity if the calculated corntion factor is greater than one. This approach ensures that the future calculated inventory for negative worth isotopes is not increased if the chemical assay indicated a higher measured value than the cofiesponding calculated value.

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