Resonance Evaluation of 48Ti Including Covariance for Criticality Safety Applications

Conference · Mon Sep 19 04:00:00 EDT 2011

OSTI ID:1025843

Leal, Luiz C. ^[1]; Guber, Klaus H. ^[1]; Arbanas, Goran ^[1]; Wiarda, Dorothea ^[1]; Koehler, Paul Edward ^[1]; Kahler, A. ^[2]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

In this work we report the methodology and the results of an evaluation carried out for 48Ti in the resolved resonance region for applications in criticality safety calculations. The evaluation was performed using the computer code SAMMY with the reduced R-matrix Reich-Moore formalism. The Bayes scheme was utilized for fitting the experimental data. New transmission and capture data were essential in the evaluation process. A complete set of resonance parameters was obtained in the energy region from thermal to 400 keV. In addition to the resonance parameters, a resonance parameter covariance matrix was also obtained. The impact of the new resonance parameter evaluation in benchmark calculations, as well as the uncertainty, was verified.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1025843
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
97 MATHEMATICS AND COMPUTING
BENCHMARKS
Bayes scheme
COMPUTER CODES
CRITICALITY
EVALUATION
Evaluation
MESONS
Methodology
NEUTRONS
Nuclear Criticality Safety Program (NCSP)
R MATRIX
RESONANCE
Reduced R-matrix Reich-Moore Formalism
Results
SAFETY
SAMMY
Ti-48