Global Assessment of Nuclear Data Requirements

Global Assessment of Nuclear Data Requirements or GANDR is a IAEA Nuclear Data Section Data Development Project.
It is a set of computer programs which generate correlation matrices which rank the accuracy of various types of nuclear data.

In judging the adequacy of the nuclear data used as input to design-relevant neutron transport calculations, one finds that there is a very complex relationship between the accuracy of the input data and the accuracy of the calculated results.

Because of this complexity, there is a need for computerized tools to assist data experts in the ranking of competing proposals for new measurements of nuclear data for applications. In the 1970s, a number of research groups proposed the use of perturbation-theory based sensitivity and uncertainty analysis for this purpose.

Progress was stopped largely by the requirement of tracking of what seemed at the time to be an impossibly large amount of correlation information. With the enormous advances in computer technology, the equivalent of what once was considered a very powerful supercomputer facility (multi-gigabyte memories, multi-GHz processor speeds, terabytes of hard disk space) is now available on the desktop for under $5000. This remarkable development suggests taking a fresh look at this subject.

In this report and the other volumes in this series, we present the results of a detailed study of the feasibility of creating a tool for the Global Assessment of Nuclear Data Requirements (GANDR) based on sensitivity and uncertainty analysis.

We conclude that GANDR is now fully practical on a modern computer in the desktop class. A major outcome of this development work is that a functioning and practical prototype of the GANDR system is now available in the IAEA Nuclear Data Section.

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Resource Characteristics

Last Resource Update : 2011


Organizational Source
NAPC - Nuclear Data Section

Data Type
Codes and Numerical Data

Neutron transport calculations, sensitivity and uncertainty analysis, perturbation theory, evaluation of nuclear data and covariances, nuclear data uncertantity, nuclear reaction data, integrated cross sections, ZOTTVL least squares solver. EXFOR, PENDF, GAPREP, GAPOST, GABBROW, NJOY, SEPREP, SEPOST