10 CFR 600.171 - Closeout procedures.
(a) Recipients shall submit, within 90 calendar days after the date of completion of the award, all financial, performance, and other reports as required by the terms and conditions of the award. DOE may approve extensions when requested by the recipient.
(b) Unless DOE authorizes an extension, a recipient shall liquidate all obligations incurred under the award not later than 90 calendar days after the funding period or the date of completion as specified in the terms and conditions of the award or in agency implementing instructions.
(d) The recipient shall promptly refund any balances of unobligated cash that DOE has advanced or paid and that is not authorized to be retained by the recipient for use in other projects. OMB Circular A-129 governs unreturned amounts that become delinquent debts.
(g) In the event a final audit has not been performed prior to the closeout of an award, DOE shall retain the right to recover an appropriate amount after fully considering the recommendations on disallowed costs resulting from the final audit.