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The durability of three ceramic waste forms containing Zr as a constituent is examined at 90" and 150°C in HCl or deionized water. The three ceramic waste forms examined are: (A) 10-moI%-YZO3-stabilized ZrOZ, (B) La2ZrZ07 with a pyrochlore structure, and (C) CaZr03 with a perovskite structure. Each form contains an appropriate amount of Ce, Nd, and Sr to simulate the leaching behavior of actinides, lanthanides, and alkaline-earth fission products from highlevel nuclear waste. Two forms, (A) 10-mol%-YZ03-stabilized ZrOz and (B) LazZrZ07 with a pyrochlore structure, show excellent durability in HCI and deionized water. For example, leach rates of all constituents in the LaZZrZO7 waste form are less than about g.m-'.d-' at 150°C for a leach time of 32 d in deionized water. [

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