Article 59U.K.
If the Agency does not exercise its right of option on the whole or any part of the output of a producer, the latter:
may, either by using his own resources or under contract, process or cause to be processed the ores, source materials or special fissile materials, provided that he offers to the Agency the product of such processing;
shall be authorised by a decision of the Commission to dispose of his available production outside the Community, provided that the terms he offers are not more favourable than those previously offered to the Agency. However, special fissile materials may be exported only through the Agency and in accordance with the provisions of Article 62.
The Commission may not grant such authorisation if the recipients of the supplies fail to satisfy it that the general interests of the Community will be safeguarded or if the terms and conditions of such contracts are contrary to the objectives of this Treaty.