TRAC-M/FORTRAN 90 (Version 3.0) User's Manual (NUREG/CR-6722)
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Manuscript Completed: March 2001
Date Published: May 2001
R.G. Steinke, V. Martinez, N.M. Schnurr,
J.W. Spore, J.V. Valdez
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 either a one-, two-, or three-dimensional treatment of the pressure vessel and its associated internals; 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-flood and falling-film quench fronts, and consistent treatment of entire accident sequences, including the generation of consistent steady-state initial conditions. The stabilityenhancing, two-step numerical algorithm is used in the one-, two-, and three-dimensional hydrodynamics and permits violation of the material Courant-limit condition up to 1000. This technique permits large timesteps, which reduce the run time for slow transients.
TRAC-M no longer models the accumulator (ACCUM) component and steam-generator (STGEN) component. The ACCUM component needs to be modeled by FILL and PIPE components, and the STGEN component needs to be modeled by using heat-structure (HTSTR), PIPE, and TEE components, as described in Appendix I. The HTSTR component provides the user with a very flexible capability to model heat transfer in complicated geometries with many optional features. An improved reflood model based on mechanistic and defensible models has been added. TRAC-M also contains additions and refinements for several components and improved constituative models. A steady-state initialization procedure provides a better coolant temperature and flow distribution initial estimate for steady-state calculations.
This user's guide describes the components and control systems modeled in TRAC-M and gives detailed information the user needs to prepare an input-data file and carry out neutronic-thermal-hydraulic simulations using TRAC-M. This release of the TRAC-M/F90 User's Manual is consistent with TRAC-M/F90, Version 3.0. Also, areas are described where TRAC-M/F90, Version 3.0 differs from TRAC-M/F77, Version 5.5.2, and input specifications are provided for both codes.