10 C.F.R. § 800.301
The Secretary shall have the right to audit any and all costs of the bid or proposal for which the loan is sought or made and to exclude or reduce the includible amount of any cost in accordance with § 800.200 . Auditors who are employees of the United States Government, who are designated by the Secretary of Energy or by the Comptroller General of the United States, shall have access to, and the right to examine, any directly pertinent documents and records of an applicant or borrower at reasonable times under reasonable circumstances. The servicing agent, if any, shall make information regarding the loan available to the Secretary of Energy and Comptroller General to the extent lawful and within its ability. The Secretary may direct the applicant or borrower to submit to an audit by public accountant or equivalent acceptable to the Secretary.
10 C.F.R. § 800.301