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The weight gain of Zircaloy-2, -3, and low nickel Zircaloy-2 during water and steam corrosion is shown to go through two or more repetitive cycles. The evidence indicates these weight gain curves truly represnt the corrosion kinetics. Several corrosion mechanisms are considered in the light of these kinetics. While no definite mechanism can be established, a supposition that stresses in the film periodically cause it to crack at or near the oxide-metal interface appears consistent with the data. Preliminary micrographic evidence supporting the existence of a cyclic corrosion process also is shown. 1021 Zircaloy-2 ZH Zircaloy-2 L or H Low nickel Zirca]oy-2 KE-46 Low nickel Zircaloy-2 Rolled sheet (30 mils) produced from ingot 5Y-HO-9. Analysis below. Rolled sheet (62 mils) produced from ingot SA-11857. Analysis below. Rolled sheet (25 mils) produced from ingot 28260-4-6V. Analysis below. Rolled sheet (30 mils) produced from ingot KE-46. Analysis below.

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