The paper deals with two theoretical problems in Zr-alloys corrosion. The first task is aimed to predict effect of variation in alloy composition on susceptibility of the alloy to nodular corrosion. The effect may be due to a feedback between the concentration of alloying atoms in the oxide film and the rate of oxygen transfer through the oxide film. Redistribution of alloying elements near the oxide-metal interface during the development of nodules may occur as a result of the drift of alloying additives in the field of mechanical stress. The second task is directed to determine parametric dependences for transition in oxidation kinetics. The transition in oxide growth kinetics may depend on the properties of zirconium alloy and oxide film. Parametric criterion for the transition was derived in the framework of theoretical analysis. The analysis assumed minimization of mechanical energy in the system 'oxide film - metal' with taking into account possible formation of periodic structures at the oxide-metal interface.
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