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\title{Recent Developments in the Nuclear Data Processing Code AMPX\footnote{This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).}}
\author[1]{Andrew M. Holcomb}
\author[1]{Dorothea Wiarda}
\author[1]{Jesse M. Brown}
\affil[1]{%Nuclear Energy and Fuel Cycle Division,
Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA}
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Pointwise and covariance reading/writing for the new General Nuclear Data Structure (GNDS) \cite{GNDS} format proposed by the Working Party on International Nuclear Data Evaluation Co-operation (WPEC) at the Nuclear Energy Agency (NEA) established Subgroup 38 (SG38) \cite{WPEC} in 2012 has been implemented in AMPX \cite{AMPX}. In addition, WPEC established Subgroup 38 (SG38) in 2012 to develop a more modern format for the evaluated nuclear data files (ENDF), currently called GND (General Nuclear Data format). The SG38 has formally ended, the final report has been issued, and the format for GNDS files has been finalized. Two new subgroups were formed to follow up on the development of the new format: EG GNDS, the subgroup that will govern the new format, and SG43, the subgroup that is tasked with developing an Application Programming interface (API) to the new format. ORNL has been involved in both subgroups.
The ORNL processing code suite AMPX processes ENDF formatted files and needs to support both the old and new formats. Of special interest to ORNL are the formats in the resolved resonance range (RRR) and the covariance matrix for the resonance parameters, as these formats are used in both AMPX and SAMMY \cite{SAMMY}, which is used to generate new ORNL resonance evaluations for distribution to the National Nuclear Data Center (NNDC). The code was developed to read and write the new GNDS formatted files and will be used in both AMPX and SAMMY. Because the format has not yet been finalized, support for the GNDS is included into the modernized code only on an experimental basis. The AMPX classes are automatically generated from the GNDS low level classes directly from the JSON files (on which the official GNDS documentation is based). Only point-wise data and covariance matrix information is currently processed. New ENDF/B-VIII.0 data libraries are provided in both formats and consistency between AMPX libraries generated from GNDS and ENDF-6 formats has been verified internally.
Additionally, AMPX will now prevent mathematically incorrect covariance matrices from being added to final covariance libraries. In order to ensure robust behavior in sensitivity/uncertainty applications, covariance data from ENDF/B must be processed and corrected for mathematical consistency. Ideally, covariance data from ENDF could be straightforwardly processed into SCALE COVERX formats for use in sensitivity/uncertainty applications. PUFF is responsible for performing the difficult task of processing ENDF/GNDS formatted data into the SCALE Coverx format. While there is no rubric for grading the quality of the covariance data itself, there are mathematics we can check and enforce on the processed data. The constraints enforced on the processed data ensure that SCALE codes will be able to faithfully propagate the uncertainty data onto quantities of interest in a rigorously correct manner. The new implementation of the rigorous mathematical checks and processing fixes will be presented.
{\bf Acknowledgments:} This work was supported by the U.S. Department of Energy (DOE) Nuclear Criticality Safety Program, which is funded and managed by the National Nuclear Security Administration for DOE.
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\bibitem{SAMMY} N.M. Larson, {\em ``Updated Users' Guide for SAMMY: Multilevel R-matrix Fits to Neutron Data Using Bayes' Equations"}, ORNL/TM-9179/R8 (2008)
\bibitem{WPEC} WPEC Subgroup 38 (SG38), “Beyond the ENDF format: A modern nuclear database structure”, http://www.oecd-nea.org/science/wpec/sg38/ (2012).
\bibitem{AMPX} D. Wiarda, M. L. Williams, C. Celik, and M. E. Dunn,
{\em AMPX-2000: A Cross-Section Processing System for Generating Nuclear Data for Criticality Safety Applications},
International Conference on Nuclear Criticality Safety (ICNC 2015).
\bibitem{GNDS} Specifications for the Generalised Nuclear Database Structure (GNDS)
\href{https://www.oecd-nea.org/science/wpec/documents/7519-GNDS.pdf}{https://www.oecd-nea.org/science/wpec/documents/7519-GNDS.pdf},
(accessed September 15, 2021).
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