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. Walton<sup>1

1</sup>Sandia 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

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Abstract

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.