50 USC 98d - Authority for stockpile operations

(a) Funds appropriated for acquisitions; proposed stockpile transactions; significant changes therein 

(1) Except for acquisitions made under the authority of paragraph (3) or (4) of section 98e (a) of this title, no funds may be obligated or appropriated for acquisition of any material under this subchapter unless funds for such acquisition have been authorized by law. Funds appropriated for such acquisition (and for transportation and other incidental expenses related to such acquisition) shall remain available until expended, unless otherwise provided in appropriation Acts.
(2) If for any fiscal year the President proposes certain stockpile transactions in the annual materials plan submitted to Congress for that year under section 98h–2 (b) of this title and after that plan is submitted the President proposes (or Congress requires) a significant change in any such transaction, or a significant transaction not included in such plan, no amount may be obligated or expended for such transaction during such year until the President has submitted a full statement of the proposed transaction to the appropriate committees of Congress and a period of 45 days has passed from the date of the receipt of such statement by such committees.
(b) Disposal 
Except for disposals made under the authority of paragraph (3), (4), or (5) of section 98e (a) of this title or under section 98f (a) of this title, no disposal may be made from the stockpile unless such disposal, including the quantity of the material to be disposed of, has been specifically authorized by law.
(c) Authorization of appropriations 
There is authorized to be appropriated such sums as may be necessary to provide for the transportation, processing, refining, storage, security, maintenance, rotation, and disposal of materials contained in or acquired for the stockpile. Funds appropriated for such purposes shall remain available to carry out the purposes for which appropriated for a period of two fiscal years, if so provided in appropriation Acts.