The Nuclear Waste Technical Review Board (NWTRB) requested GAO views on whether its two proposed changes for processing employee temporary duty travel claims conformed with GAO guidance. GAO noted that: (1) the NWTRB proposal to change the threshold for submitting receipts for expenses from $25 to $75 is acceptable as long as NWTRB implementation is consistent with General Services Administration (GSA) travel regulations; (2) GAO guidance does not specify a dollar threshold for receipt submissions; (3) GSA has granted NWTRB a waiver of the requirement to itemize expenses costing $75 or less if GAO concurs; (4) NWTRB should require travelers to itemize on their travel vouchers all expenses below the $75 threshold, since this information helps the certifying officials to determine the validity of a claim and reduces the risk of errors and irregularities going undetected; and (5) NWTRB should consider modifying existing systems to improve its travel claims processing.