**Form L-4389-1 (Ed. 1/87)**

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* **Special nuclear material:** If at any time the total amount of such material in the custody of the insured at the premises where such equipment or device is located consists of or contains more than 25 grams of plutonium or uranium 233 or any combination thereof, or more than 250 grams of uranium 235.
* **Nuclear reactor:** Means any apparatus designed or used to sustain nuclear fission in a self-supporting chain reaction or to contain a critical mass of fissionable material.
* **Property damage:** Includes all forms of radioactive contamination of property.

(d) Any structure, basin, excavation, premises or place prepared or used for the storage or disposal of waste,