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The report describes the three additional turbulence models recently implemented in the COMMIX-1B computer code. COMMIX-1B is a three-dimensional, steady-state/transient, single-phase computer code for thermal-hydraulic analysis of single/multicomponent systems under normal and off-normal operating conditions. All three turbulence models are provided as options, and a user can select the one that is most appropriate for his or her application. To validate these turbulence models, we have performed several numerical simulations and compared the results with experimental data. Three of the simulations--turbulent flow in a pipe, flow in a circular duct with sudden expansion, and thermal and fluid mixing in the cold leg and downcomer of a PWR--are presented here along with their comparisons with experimental data. More analyses are needed for further validation. Incorporation of the three turbulence models has expanded the range of application of the COMMIX code.