Abstract
Probability table is one of the most important and natural methods used to simulate the neutron transport in unresolved resonance range in reactor physics. A new module for generating probability tables in the unresolved-resonance region has been developed for the nuclear data processing code Ruler, using ladder method. In order to validate and verify the accuracy of this module, Probability tables have been calculated and compared with NJOY2016. Agreement is observed in the comparisons of the probability tables and corresponding cross-section values that are calculated by Ruler and NJOY2016. Ruler has improved computational efficiency greatly comparing with NJOY2016 as multi-thread parallel algorithm is applied.
Highlights
The Ruler[1] code system, which is maintained at the China Nuclear Data Center(CNDC), is used for generating cross section data library for neutronics calculations from evaluated nuclear data in the ENDF-6[2] format
This paper describes a new module for Ruler which has been developed to compute probability tables from the unresolved resonance parameters using ladder method
In order to validate and verify the accuracy of this new module, Ruler has been used to calculate probability tables for several isotopes in ENDF/B-VIII.0[7], and comparisons are made with the NJOY2016 module PURR
Summary
The Ruler[1] code system, which is maintained at the China Nuclear Data Center(CNDC), is used for generating cross section data library for neutronics calculations from evaluated nuclear data in the ENDF-6[2] format. Precise cross section values are unknown in the URR and energy-average parameters and statistical distributions are provided instead. Ruler has already developed a module named NURD to generate effective self-shielding cross sections in URR. For monte carlo applications like OpenMC, probability table method is a more natural approach to provide crosssection probability distribution functions for energy ranges at specific temperatures within the URR. Ladder method, which is described by Levitt[3], is the basis for the probability-table method in NJOY[4]. The other one is Monte Carlo (MC) method[5], which is used in the AMPX cross-section processing system that has been developed at ORNL. This paper describes a new module for Ruler which has been developed to compute probability tables from the unresolved resonance parameters using ladder method
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