5. **Cancellation**: This policy may be cancelled by the Named Insured by surrender thereof to the Company or by mailing to the Company written notice stating when thereafter the cancellation shall be effective. This policy may be cancelled by the Company by mailing to the Named Insured at the address shown in this policy, written notice stating when not less than ten (10) days for non-payment of the premium or thirty (30) days for other than non-payment of the premium thereafter such cancellation shall be effective. The mailing of notice as aforesaid shall be sufficient proof of notice. The time of the surrender or the effective date and hour of cancellation stated in the notice shall become the end of the policy period. Delivery of such written notice, either by the Named Insured or by the Company, shall be equivalent to mailing.

The Insured first named in the Declarations is authorized to act on behalf of all Named Insureds and other Insureds with respect to the giving and receiving of notice of cancellation and to the receiving of any return premium that may become payable under this policy.

If the Named Insured cancels, earned premium shall be computed in accordance with the short rate table and procedure in use for this policy. If the Company cancels, earned premium shall be computed pro rata. Premium adjustment may be made either at the time cancellation is effected or as soon as practicable after cancellation becomes effective, but payment or tender of unearned premium is not a condition of cancellation. In the event of cancellation by the Named Insured, earned premium shall in no case be less than the Policy Minimum Premium stated in the Declarations.

**Exclusion**

This policy shall not apply:

1. Under any Liability Coverage, to Ultimate Net Loss

(a) with respect to which an Insured under this policy is also an insured under a nuclear energy liability policy issued by Nuclear Energy Liability Insurance Association, Mutual Atomic Energy Liability Underwriters or Nuclear Insurance Association of Canada, or would be an insured under any such policy but for its termination upon exhaustion of its limit of liability; or

(b) arising out of hazardous properties of nuclear material and with respect to which (1) any person or organization is required to maintain financial protection pursuant to the Atomic Energy Act of 1954, or any law amendatory thereof, or (2) the Insured is, or had this policy not been issued would be, entitled to indemnity from the United States of America, or any agency thereof, under any agreement entered into by the United States of America, or any agency thereof, with any person or organization.

2. Under any Medical Payments Coverage, or under any Supplementary Payments provision relating to first aid, to expenses incurred with respect to Personal Injuries resulting from hazardous properties of nuclear material and arising out of the operation of a nuclear facility by any person or organization.

3. Under any Liability Coverage, to Ultimate Net Loss arising out of 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 Ultimate Net Loss 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 Property Damage to such nuclear facility and any property thereof.

4. As used in this exclusion: "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 of 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;