Program - Brookhaven National Laboratory

The results of these subgroups are published in reports issued by the NEA. Twenty-eight reports have
been published so far. Studies recently completed comprise a number of works related to nuclear data
covariance and associated processing issues, as well as more specific works related to the gamma production
from fission-product capture reactions, the uranium-235 capture cross-section, the EXFOR database,
and the quality of nuclear data for advanced reactor systems. Ongoing activities focus on methods and
issues for the combined use of integral experiments and covariance data, the evaluation of plutonium-239
in the resonance region, scattering angular distribution in the fast energy range, and reporting/usage of
experimental data for evaluation in the resolved resonance region. Future activities will include two new
subgroups on improved fission product yield evaluation methodologies and on modern nuclear database
structures beyond the ENDF format. In addition to the above mentioned short-term, task-oriented subgroups,
the WPEC also hosts a longer-term subgroup charged with reviewing and compiling the most
important nuclear data requirements in a high priority request list (HPRL). The present contribution will
briefly review recent achievements of the WPEC, outline ongoing activities and plans for future activities
and challenges in the field of evaluated nuclear data.
KA 2 2:00 PM
International Effort to Define a New Nuclear Data Structure
B. R. Beck, C. M. Mattoon, N. C. Summers, N. R. Patel, D. P. McNabb
Lawrence Livermore National Laboratory
D. A. Brown
Brookhaven National Laboratory
Current evaluated nuclear data formats like ENDF date to the 1960s. These formats limit the type of
reactions and particles that can be represented as well as the precision of the data. With the formation
of NEA/WPEC subgroup 38, the international nuclear data community has begun an effort to design a
new structure for storing evaluated nuclear data. The first meeting for subgroup 38 will be held in early
December of 2012. Prior to the international effort on a new evaluated nuclear data structure, Lawrence
Livermore National Laboratory (LLNL) began working to develop a new nuclear data structure called
Generalized Nuclear Data (GND) which, it is hoped, will facilitate the international effort. GND is nearly
complete and LLNL has developed routines to convert ENDF data to and from GND as well as converting
LLNL’s legacy ENDL format to GND. An overview of GND and the current development within subgroup
38 will be presented. This work has been supported by Department of Energy contract No. DE-AC52-
07NA27344 (Lawrence Livermore National Laboratory) and by funds from the Nuclear Data Program
Initiative of the American Recovery and Reinvestment Act (ARRA).
KA 3 2:20 PM
Toward More Complete and Accurate Experimental Nuclear Reaction Data Library
(EXFOR) - International Collaboration Between Nuclear Reaction Data Centres (NRDC)
N. Otuka, V. Semkova
Nuclear Data Section, International Atomic Energy Agency, A-1400 Wien, Austria
B. Pritychenko
National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973, USA
E. Dupont
Data Bank, OECD Nuclear Energy Agency, F-92130 Issy-les-Moulineaux, France
A.I. Blokhin
Centr Jadernykh Dannykh, Fiziko-Energeticheskij Institut, 249033 Obninsk, Russia
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