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Accession Number DE13-1098310
Title Validation of MENDF71x.
Publication Date Oct 2013
Media Count 55p
Personal Author D. K. Parsons J. L. Conlin S. J. Gardiner
Abstract The Nuclear Data Team at Los Alamos National Laboratory has recently finished processing a new multi-group neutron data library, MENDF71x, based on ENDF/B-VII.1. MENDF71x contains room-temperature, downscatter only cross sections for the 423 evaluations in ENDF/B-VII.1. The data has been extensively validated by using the data to calculate keff for 91 models of critical assemblies from the International Handbook of Evaluated Criticality Safety Benchmark Experiments. The keff values were compared to the experimental benchmarks explanations are given to explain the differences between the modeled keff and the experimentally measured keff. The results of calculating keff from critical benchmark models and comparing them to the experimental values give confidence in the validity of the data in the MENDF71x library. The MENDF71x library was compared to the MENDF70x and LANL2006ex libraries. Differences in keff between MENDF71x and the MENDF70x and LANL2006ex were calculated. The isotopes responsible for the change in keff between MENDF71x and the other libraries were identified by reverting each isotope in the model to one of the previous libraries and again calculating the keff value to identify the change. The results of reverting each isotope is presented in this paper. The evaluations that give the biggest change in keff are also those which had the biggest change between ENDF/B-VII.0 and ENDF/B-VII.1.
Keywords Benchmarks
Criticality
Cross sections
Data processing
Evaluation
Isotopes
Los Alamos National Laboratory
Neutrons
Nuclear data collections
Safety


 
Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 46 - Physics
77F - Radiation Shielding, Protection, & Safety
Corporate Author Los Alamos National Lab., NM.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1411
Contract Number DE-AC52-06NA25396

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