TRAC-PF1/MOD2 code manual

Technical Report · Wed Jul 01 00:00:00 EDT 1992

OSTI ID:7308522

Schnurr, N M; Steinke, R G; Martinez, V; Spore, J W ^[1]

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1. Los Alamos National Lab., NM (United States)

The Transient Reactor Analysis Code (TRAC) was developed to provide advanced best-estimate predictions of postulated accidents in light-water reactors. The TRACPFl/MOD2 program provides this capability for pressurized water reactors and for many thermal-hydraulic test facilities. The code features either a one- or a 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 initial conditions. The stability-enhancing two-step numerical algorithm is used in both the one- and three-dimensional hydrodynamics and permits violation of the material Courant condition. This technique permits large time steps and, hence, reduced running time for slow transients. In addition to the components contained in previous TRAC versions, TRAC-PFl/MOD2 includes a heat-structure component that allows the user to accurately model complicated geometries. An improved reflood model based on mechanistic and defensible models has been added. The new code also contains improved constituative models and additions and refinements for several components. This guide describes the components and control systems used in TRAC and gives detailed information the user needs to prepare an input deck and carry out simulations using TRAC-PFl/MOD2.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (United States). Div. of Systems Research; Los Alamos National Lab., NM (United States)
• Sponsoring Organization: NRC; Nuclear Regulatory Commission, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7308522
• Report Number(s): NUREG/CR-5673-Vol.2; LA--12031-M-Vol.2; ON: TI92019222
• Country of Publication: United States
• Language: English

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