; or (2) insufficient Federal funds to operate all or part of the covered unit as a result of a failure of the Federal Government to make sufficient funds available for this purpose. (b) Conditions Agreements entered into under this section— (1) shall only apply to a covered unit within the boundaries of the eligible entity that is a party to the agreement; (2) may apply to all or part of a covered unit; (3) shall be for a term of not more than 5 years, unless the 5-year term would expire during a period when the agreement is being actively implemented, in which case the agreement shall expire at the conclusion of the lapse of funding (and related reimbursement) which precipitated the implementation; and (4) shall be in effect only during any period in which the Secretary is unable to operate and manage covered units at normal levels, as determined in accordance with the terms of agreement entered into under subsection (a). (c) Copies of agreements A copy of each agreement entered into under this section shall be— (1) kept by the Secretary, the eligible entity, and any other appropriate agency; and (2) available for inspection by Congress. (d) Reimbursement To the extent that funds are made available, through Acts of appropriation or otherwise, for activities carried out by an eligible entity under an agreement entered into under this section, the Secretary shall reimburse the eligible entity for costs expended by the eligible entity to carry out those activities. 5. Exception Notwithstanding section 4, the Secretary may restrict access to any covered unit for reasons of national security. 6. Report For any instance in which the Secretary does not enter into an agreement after an offer under section 4, the Secretary shall submit to the Committee on Natural Resources of the House of Representatives and the Committee on Energy and Natural Resources of the Senate a report stating— (1) that an offer was made; (2) what eligible entity made the offer; (3) what the offer entailed