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Evaluation of Measured and Simulated List-Mode Data for Subcritical Systems

Conference ·
OSTI ID:1164738
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
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Measured and simulated list-mode data from the NPOD detector system were compared for subcritical systems. Five BeRP ball configurations reflected by polyethylene are investigated in this work. The simulated data were calculated using the MCNP list-mode patch developed at LANL. In addition to comparing the moments of the counting distributions, a full analysis was conducted to infer the multiplication of each system using both the Hansen-Dowdy and Hage-Cifarelli formulisms of the Feynman Variance-to-Mean Method. Several of the parameters that are input into these methods were also varied to determine their affect on the system multiplication. The main parameters investigated included the system source strength and reflector transmission. It is shown that when comparing the measured and simulated data while using the same method and parameters the multiplication values agree within 5.5%. The measured and simulated multiplication values differ more as the reflector thickness increases. The moments for the simulated data were higher than the measured data for all of the configurations and also disagreed more as the reflector thickness increased.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
DOE Contract Number:
AC52-06NA25396
OSTI ID:
1164738
Report Number(s):
LA-UR--12-01139; LA-UR-12-1139
Country of Publication:
United States
Language:
English

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Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Ball Configurations
MCNP
Nuclear Criticality Safety Program (NCSP)