Before the Commission establishes any guaranteed purchase price or guaranteed purchase price period in accordance with the provisions of section 2076 of this title, or establishes any criteria for the waiver of any charge for the use of special nuclear material licensed and distributed under section 2073 of this title, the proposed guaranteed purchase price, guaranteed purchase price period, or criteria for the waiver of such charge shall be submitted to the Energy Committees and a period of forty-five days shall elapse while Congress is in session (in computing such forty-five days there shall be excluded the days in which either House is not in session because of adjournment for more than three days): Provided, however, That the Energy Committees, after having received the proposed guaranteed purchase price, guaranteed purchase price period, or criteria for the waiver of such charge, may by resolution in writing waive the conditions of, or all or any portion of, such forty-five-day period.