; purchase of obligations by the Secretary of the Treasury (a) In general To finance its activities, the Corporation may issue revenue bonds payable from corporate revenue to the Secretary of the Treasury. (b) Total value The total value of all bonds issued as described in subsection (a) shall not exceed a sum that shall be determined by the Secretary of Transportation in conjunction with the Secretary of the Treasury. (c) Maturity dates Bonds issued as described in subsection (a) shall have maturity dates agreed upon by the Corporation and the Secretary of the Treasury that shall not be in excess of 50 years. The obligations on such bonds may be redeemable at the option of the Corporation before the maturity in such a manner as may be stipulated in such obligations, but the obligations thus redeemed shall not be refinanced by the Corporation. (d) Coordination with title 31 (1) Authority to use proceeds from sale of Treasury securities For the purpose of purchasing obligations of the Corporation, the Secretary of the Treasury may use as a public debt transaction the proceeds from the sale by the Secretary of any securities issued under chapter 31 of title 31, United States Code, and the purposes for which securities may be issued under such chapter are extended to include such purchases. (2) Treatment of transactions All purchases and sales by the Secretary of the Treasury of obligations issued by the Corporation under this section shall be treated as public debt transactions of the United States. 7. Reports (a) In general Not later than 1 year after the outset of corporate activities of the Corporation, the Corporation shall submit a special report to Congress regarding the success of the Corporation and its general operations. (b) Additional reports (1) New proposals In addition to the report described in subsection (a), the Corporation shall submit to Congress a special report whenever there is proposed a new feature, facility, design, or phase of the Corporation involving an estimated value exceeding