SecPop Version 4: Sector Population, Land Fraction, and Economic Estimation Program: User Guide, Model Manual, and Verification Report (NUREG/CR-6525, Revision 2)

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Publication Information

Manuscript Completed: December 2018
Date Published:
June 2019

Prepared by:
S. Weber1*
N. Bixler1
K. McFadden2

1Sandia National Laboratories
Albuquerque, New Mexico 87185
Operated by Lockheed Martin Corporation

2Sigma Software, LLC
1935 Wasmer Circle
Bosque Farms, NM 87068

* Formerly of Sandia National Laboratories

NRC Contract Number: NRC-HQ-60-15-T-0006

Jonathan Barr, NRC Technical Monitor

Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

Availability Notice


In 1973 the U.S. Environmental Protection Agency (EPA) developed SecPop to calculate population estimates to support a study on air quality. The Nuclear Regulatory Commission (NRC) adopted this program to support siting reviews for nuclear power plant construction and license applications. Currently SecPop is used to prepare site data input files for offsite consequence calculations with the MELCOR Accident Consequence Code System (MACCS). SecPop enables the use of site-specific population, land use, and economic data for a polar grid defined by the user.

Updated versions of SecPop have been released to use U.S. decennial census population data. SECPOP90 was released in 1997 to use 1990 population and economic data. SECPOP2000 was released in 2003 to use 2000 population data and 1997 economic data. This report describes the current code version, SecPop version 4.3, which uses 2010 population data and both 2007 and 2012 economic data. It is also compatible with 2000 census and 2002 economic data.

This report contains guidance for the installation and use of the code as well as a description of the theory, models, and algorithms involved. It also contains appendices which describe the development of the 2010 census file, 2007 county file, and 2012 county file. Finally, an appendix is included that describes the validation assessments performed.

Page Last Reviewed/Updated Wednesday, March 24, 2021