NJOY-2016 Course

29-31 October 2018

NEA Headquarters, Boulogne-Billancourt, France

Los Alamos National Laboratory’s NJOY Nuclear Data Processing Code System has been under continuous development since the 1970s. It is used to process Evaluated Nuclear Data Files (ENDF) in the legacy 80-column card image format into application specific data files, with its most common use being the creation of ACE (A Compact ENDF) files for use with the MCNP code.


The course will take place at NEA Headquarters in Boulogne-Billancourt (Paris) and has a cost of 550 EUR per participant, including lunches and coffee breaks.


Scope of the training

The class will include a detailed discussion of the ENDF system, focusing on the legacy card image format that is used worldwide, with brief mention of the forthcoming Generalized Nuclear Data (GND) format. Following this we will provide an overview of NJOY’s capabilities, with specific focus on creating MCNP ACE files. This will include continuous energy fast, or “c” files, thermal, or “t” files, and dosimetry, or “y” files. NJOY can also be utilized to plot cross sections, angular distributions and secondary emission spectra. Class exercises will demonstrate these capabilities.

Outline of the class

*Computer exercises are intermingled throughout the lectures

First Day


Afternoon Second Day


Afternoon Third Day



(Class participants who are also licensed MCNP users and have access to that code on their personal laptops will be able to immediately use these new files.)