available until expended: Provided further , That of the amounts appropriated under this heading, $10,500,000 shall be for university research and development in areas relevant to the Commission’s mission, and $5,500,000 shall be for a Nuclear Science and Engineering Grant Program that will support multi-year projects that do not align with programmatic missions but are critical to maintaining the discipline of nuclear science and engineering: Provided further , That of the amounts appropriated under this heading, $17,709,000 shall be for activities related to the development of regulatory infrastructure for advanced nuclear technologies, and $13,349,000 shall be for international activities, except that the amounts provided under this proviso shall not be derived from fee revenues: Provided further , That the sum herein appropriated shall be reduced by the amount of revenues received during fiscal year 2021 so as to result in a final fiscal year 2021 appropriation estimated at not more than $120,607,000. Office of inspector general For expenses necessary for the Office of Inspector General in carrying out the provisions of the Inspector General Act of 1978, $13,499,000, to remain available until September 30, 2022: Provided , That revenues from licensing fees, inspection services, and other services and collections estimated at $11,106,000 in fiscal year 2021 shall be retained and be available until September 30, 2022, for necessary salaries and expenses in this account, notwithstanding section 3302 of title 31, United States Code: Provided further , That the sum herein appropriated shall be reduced by the amount of revenues received during fiscal year 2021 so as to result in a final fiscal year 2021 appropriation estimated at not more than $2,393,000: Provided further , That of the amounts appropriated under this heading, $1,206,000 shall be for Inspector General services for the Defense Nuclear Facilities Safety Board. Nuclear waste technical review board SALARIES AND EXPENSES For expenses necessary for the