Sandia Energy > Programs > Nuclear Energy > Safety, Severe Accident, and Consequence > MELCOR MELCOR (portmanteu from “melting core”) is a fully integrated, engineering-level computer code developed by Sandia National Laboratories for the U.S. Nuclear Regulatory Commission to model the progression of severe accidents in nuclear power plants. A broad spectrum of severe accident phenomena in both boiling and pressurized water reactors is treated in MELCOR in a unified framework. Furthermore, its generalized framework and ability to track aerosol/vapor species makes it applicable for non-nuclear safety related applications. MELCOR applications include estimation of severe accident source terms, and their sensitivities and uncertainties in a variety of applications. Documentation MELCOR documentation listed below can be found on the U.S. Nuclear Regulatory Commission ADAMS site. MELCOR 2.2 Documentation MELCOR 2.1 Documentation Events “MELCOR Computer Code Manuals, Vol. 1: Primer and Users’ Guide, Version 2.2.9541,” SAND 2017-0455 O, Sandia National Laboratories, January 2017 (ADAMS Accession No. ML17040A429). “MELCOR Computer Code Manuals, Vol. 2: Reference Manual, Version 2.2.9541,” SAND 2017-0876 O, Sandia National Laboratories, January 2017 (ADAMS Accession No. ML17040A420). “MELCOR Computer Code Manuals, Vol. 1: Primer and Users’ Guide, Version 2.1.6840,” SAND 2015-6691 R, Sandia National Laboratories, August 2015 (ADAMS Accession No. ML15300A479). “MELCOR Computer Code Manuals, Vol. 2: Reference Manual, Version 2.1.6840,” SAND 2015-6692 R, Sandia National Laboratories, August 2015 (ADAMS Accession No. ML15300A473). “MELCOR Computer Code Manuals, Vol. 3: MELCOR Assessment Problems, Version 2.1.7347,” SAND 2015-6693 R, Sandia National Laboratories, August 2015 (ADAMS Accession No. ML15300A476). MELCOR Non-LWR Demonstration Workshops June 29, 2021 – Heat-pipe Reactor July 20, 2021 – High-temperature Gas-cooled Reactor September 14, 2021 – Pebble-bed Molten-salt-cooled Reactor MELCOR links Request MELCORBugzilla MELCOR Contacts Larry L. Humphries, PhDMELCOR Principal Investigatorllhumph@sandia.gov David L. Luxat, PhDManager, Severe Accident Modeling and Analysisdlluxat@sandia.gov