; (B) shall be available for expenditure only to pay the costs of activities and services for which the fee is imposed or with which the refund or reimbursement is associated; and (C) shall remain available until expended. (3) Refunds The Board may refund any fee paid by mistake or any amount paid in excess of that required. 13. Authority of the Inspector General (a) In general The Inspector General of the Department of Homeland Security, in accordance with the mission of the Inspector General to prevent and detect fraud and abuse, shall have authority to review only the financial management, property management, and business operations of the Board, including internal accounting and administrative control systems, to determine compliance with applicable Federal laws, rules, and regulations. (b) Duties In carrying out this section, the Inspector General of the Department of Homeland Security shall— (1) keep the Chairperson of the Board and Congress fully and currently informed about problems relating to administration of the internal accounting and administrative control systems of the Board; (2) issue findings and recommendations for actions to address such problems