(c) any equipment or device used for the processing, fabricating or alloying of 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,

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

and includes the site on which any of the foregoing is located, all operations conducted on such site and all premises used for such operations; "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. With respect to injury to or destruction of property, the word "INJURY" or "DESTRUCTION" includes all forms of radioactive contamination of property.

It is understood and agreed that, except as specifically provided in the foregoing to the contrary, this clause is subject to the terms, exclusions, conditions and limitations of the policy to which it is attached.