Technical Bases for Consequence Analyses Using MACCS (MELCOR Accident Consequence Code System) (NUREG/CR-7270, SAND2022-12166 R)

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Publication Information

Manuscript Completed: August 2022
Date Published: October 2022

Prepared by:
N. Bixler1, K. Compton2, M. Dennis1, L. Eubanks3, R. Haaker4,
J. Jones1, M. Kimura5, K. McFadden6, A. Nosek2, A. Outkin1, and
F. Walton1

1Sandia National Laboratories (SNL)
2United States Nuclear Regulatory Commission (NRC)
3Architrave Software Inc.
4AQ Safety, Inc.
5Japan Atomic Energy Agency (JAEA)
6Sigma Software, LLC

J. Barr, NRC Project Manager
A. Sharp, NRC Project Manager
S. Haq, NRC Project Manager

A. Nosek, NRC Technical Monitor
K. Compton, NRC Technical Monitor

Prepared for:
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington DC 20555-0001

Availability Notice


The use of MELCOR Accident Consequence Code System (MACCS) in regulatory applications requires that input parameters used in MACCS models have a defensible and transparent technical basis. The existing technical basis for MACCS parameters was identified and updates were developed based on current data and information. The transparent way these updates are documented provides a technical basis for updating MACCS parameters with consistent application among the MACCS user community.

Page Last Reviewed/Updated Thursday, October 27, 2022