Pub. L. 94-228, tit. IV, sec. 405

Sec. 405. The interest rate used for computing interest, during construction and interest on the unpaid balance of the interest bearing reimbursable costs of the unit shall be determined by the Secretary of the Treasury, as of the beginning of the fiscal year in which construction of the unit is commenced, on the basis of the computed average interest rate payable by the Treasury upon its outstanding marketable public obligations which are neither due or callable for fifteen years from date of issue.