If the refund due to the United States is not submitted within 30
days of receiving a request for payment from SOL or OWCP, interest shall
accrue on the refund due to the United States from the date of the
request. The rate of interest assessed shall be the rate of the current
value of funds to the United States Treasury as published in the Federal
Register (as of the date the request for payment is sent). Waiver of the
collection of interest shall be in accordance with the provisions of the
Department of Labor regulations on Federal Claims Collection governing
waiver of interest, 29 CFR 20.61.