Quantcast Table 1. Results of ANISN benchmark calculations with Hansen-Roach 16-energy-group cross section data

 

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Methodology - s3007cn10078
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DOE-STD-3007-93
3.
H/Pu ratios range from 131 to 1204 for the benchmarks. H/Pu ratios range from
700 to 1100 for this analysis. Optimum values occurred between 800 and 900 for
reflected systems. The predominant cross section data for Pu-239 at optimum
conditions are associated with Hansen-Roach Library ID 94913. Hansen-Roach
Library ID 94913 is used for analysis of experiments PNL-1, PNL-3, PNL-4, and
PNL-7.
All ANISN benchmark calculations were performed with a quadrature order of 8 and 100
mesh intervals in the fuel region. For PNL-7, 100 mesh intervals were also represented in the
reflector region with 10 mesh intervals in the thin stainless steel wall.
The results of the ANISN benchmark calculations with Hansen-Roach 16-energy-group
cross section data are summarized in Table 1.
The results of the ANISN calculations agree well with the experimental values(1.0). The
largest deviation occurs for PNL-3 with an H/Pu ratio of 1204 and agreement in this case is
within 0.8%. Results for PNL-1, PNL-4, and PNL-7 indicate little (less than 0.15%) or no bias
for H/Pu ratio between 700 and 900 (enveloping optimal values of this evaluation). Inclusion of a
bias of this magnitude is inconsequential [Note: A more detailed bias determination is often
required]. There are no statistical uncertainties associated with Sn discrete ordinates methods.
ANISN
Calculated
Benchmark
ID
Description
H/Pu-239
k-effective
PNL-1
Bare sphere
700
1.0051
PNL-2
Bare sphere
131
1.0069
PNL-3
Bare sphere
1204
0.9918
PNL-4
Bare sphere
911
0.9985
PNL-5
Bare sphere
578
0.9979
PNL-7
Reflected
980
1.0023
sphere
4-10


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