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PREPRO 2018 is



Completely FORTRAN, C and C++


Initial Release June 2018 (2018-1)

(See History for Details of Updates)

What is PREPRO?

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


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

of the ENDF/B pre-processing codes earlier than PREPRO 2018 (2018-1 Version) to accurately process current ENDF evaluations.

The present codes can handle all existing ENDF/B-VIII 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 2018 CD or Register as User

PREPRO 2018 History: Check for Changes that may Effect you