TRAC-M Programmer's Guide: Fortran 77 Version 5.5 (NUREG/CR-6658)
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Manuscript Completed: October 1999
Date Published: December 1999
R.G. Steinke, S.J. Jolly-Woodruff, J.W. Spore
Los Alamos National Laboratory
Los Alamos, New Mexico 87545
F. Odar, NRC Project Manager
Division of Systems Analysis and Regulatory Effectiveness
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001
NRC Job Code W6245
The Transient Reactor Analysis Code (TRAC) was developed to provide advanced best-estimate predictions of postulated accidents in light-water reactors. The TRAC-M program provides this capability for pressurized water reactors and for many thermal-hydraulic test facilities. The code features a one- (1-), two- (2-), and three-dimensional
(3D) treatment of the pressure vessel and its associated internals. The code includes a two-fluid nonequilibrium hydrodynamics model with a noncondensable-gas field and solute tracking, flow-regime-dependent constitutive equation treatment, optional reflood tracking capability for bottom- and top-flood and falling-film quench fronts, and a consistent treatment of the entire accident sequences, including the generation of consistent initial conditions. The stability-enhancing two-step numerical algorithm is used in the 1-, 2-, and 3D hydrodynamics, and permits violation of the material Courant limit. This technique permits large timesteps, hence the running time for slow transients is reduced.
TRAC-M has a heat-structure (HTSTR) component and a radiation heat-transfer model that allows the user to model heat transfer accurately for complicated geometries. An improved reflood model based on mechanistic and defensible models has been added. TRAC-M also contains improved constitutive models and additions and refinements for several components.
This manual is the third volume of a four-volume set of documents on TRAC-M. This guide was developed to assist the TRAC-M programmer and contains information on the TRAC-M Version 1.10+ code and data structure, the TRAC-M calculational sequence, and memory.