IER-163 Post-Experiment MCNP Calculations (U)

Technical Report · Tue May 29 00:00:00 EDT 2012

DOI:https://doi.org/10.2172/1043008· OSTI ID:1043008

Favorite, Jeffrey A. ^[1]

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1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

IER-163 has been modeled with high fidelity in MCNP6. The model k_eff was high, as in other similar calculations. The fission ratio ²³⁸U(n,f)/²³⁵U(n,f) was 12.6% too small compared with measurements; the ratio ²³⁹Pu(n,f)/²³⁵U(n,f) was 11.5% too small compared with measurements; the iridium ratio ¹⁹³Ir(n,n´)/¹⁹¹Ir(n,γ) was 16.4% too large; and the gold ratios ¹⁹⁷Au(n,2n)/¹⁹⁷Au(n,γ), ¹⁹⁷Au(n,2n)/²³⁵U(n,f), and ¹⁹⁷Au(n,γ)/²³⁵U(n,f) were within one standard deviation of the measured values. It is suggested that the calculated ²³⁵U fission rate is too large and the calculated ²³⁸U fission rate is too small.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1043008
• Report Number(s): LA-UR--12-21888
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
97 MATHEMATICS AND COMPUTING
DATA
FISSION
FISSION RATIO
GOLD
IRIDIUM
Mathematics & Computing(97)
Nuclear Physics & Radiation Physics(73)
Radiation Chemistry
Radiochemistry
& Nuclear Chemistry(38)
URANIUM