III. Under any liability coverage, to injury, sickness, disease, death or destruction resulting from the hazardous properties of nuclear material, if

(a) the nuclear material (1) is at any nuclear facility owned by, or operated by or on behalf of, an insured or (2) has been discharged or dispersed therefrom;

(b) the nuclear material is contained in spent fuel or waste at any time possessed, handled, used, processed, stored, transported or disposed of by or on behalf of an insured; or

(c) the injury, sickness, disease, death or destruction arises out of the furnishing by an insured of services, materials, parts or equipment in connection with the planning, construction, maintenance, operation or use of any nuclear facility, but if such facility is located within the United States of America, its territories or possessions or Canada, this exclusion (c) applies only to injury or destruction of property at such nuclear facility.

IV. As used in this endorsement:

"HAZARDOUS PROPERTIES" include radioactive, toxic or explosive properties;

"NUCLEAR MATERIAL" means source material, special nuclear material, or byproduct material; "SOURCE MATERIAL", "SPECIAL NUCLEAR MATERIAL", and "BYPRODUCT MATERIAL" have the meanings given them in the Atomic Energy Act 1954 or in any law amendatory thereof; "SPENT FUEL" means any fuel element or fuel component, solid or liquid, which has been used or exposed to radiation in a nuclear reactor; "WASTE" means any waste material (1) containing byproduct material and (2) resulting from the operation by any person or organization of any nuclear facility included within the definition of nuclear facility under paragraph (a) or (b) thereof; "NUCLEAR FACILITY" means

(a) any nuclear reactor,

(b) any equipment or device designed or used for (1) separating the isotopes of uranium or plutonium, (2) processing or utilizing spent fuel, or (3) handling, processing or packaging waste,