The ENDF/B Pre-processing codes (PREPRO), is a collection of 18 computer codes,

which are designed to convert ENDF/B formatted neutron and/or photon data

from the original distributed form to a form in which the data can be used in applications.

These codes also allow you to view the data, on-screen and/or hardcopy.

The ENDF/B Pre-Processing Codes run on virtually ANY Computer

Pre-Processing code output is Completely FORTRAN, C and C++ Compatible

Here you can download the codes and documentation for ANY computer

Here you can also download the BEST Input Parameters to use with each code

Recent changes in ENDF/B-VII Format and procedures, as well as the evaluations themselves makes it impossible for versions

of the ENDF/B pre-processing codes earlier than PREPRO 2015 (2015 Version) to accurately process current ENDF/B-VII evaluations.

The present codes can handle all existing ENDF/B-VII.0 and VII.1 evaluations.

Documentation is NOT included with downloaded codes for each computer.

You must download documentation separately.

Download Codes

Download Documentation

Download BEST Input Parameters

Request PREPRO 2015 CD or Register as User

PREPRO 2015 History: Check for Changes that Effect you

This now includes March 2015 (2015-2) Updates