Sensitivity-Uncertainty Techniques for Nuclear Criticality Safety

Abstract

Catalog of sensitivity profiles for 1000s of experiments SU-based Analysis USL Upper Subcritical Limit for criticality safety analysis Nuclear Cross-section Covariance Data Sensitivity-Uncertainty Techniques for Nuclear Criticality Safety 9 Sensitivity-Uncertainty Techniques for Nuclear Criticality Safety 38 Flux Spectra for Neutron Slowing Down & Criticality 2 MeV neutrons hydrogen fission neutrons hydrogen fission neutrons water fission neutrons water + B 10 fission neutrons water + U 238 Fuel Pin Unit Cell loglin plots of φ(u) vs u loglog plots of φ(E) vs E 2 MeV neutrons hydrogen fission neutrons hydrogen fission neutrons water fission neutrons water + B 10 fission neutrons water + U 238 Fuel Pin Unit Cell

LANL Critical Benchmark Comparison Study and Subsequent Revision

“…LANL has a benchmark library of critical experiments from the International Criticality Safety Benchmark Evaluation Project (ICSBEP) Handbook [2] modeled for use with MCNP. This collection is now over 1100 benchmarks, is referred to as the Whisper-1.1 library because it is used with a sensitivity/uncertainty package, Whisper, which helps support nuclear criticality safety validation and is released with MCNP6.2 [3][4][5]. The collection, originally created several decades ago, is a combination of smaller collections, which has been revised and expanded, by various groups at LANL over the years.…”

“…XCP began reviewing the particular cases pointed out by the DOE NCSP intercomparison collaboration with IRSN, LLNL, and ORNL. In parallel, LANL NCS Division had begun a formal review of all benchmarks, in accordance with recent procedures and documentation requirements [5]. This report includes the results of both of those efforts.…”