Home2011 Treaties and Agreements ...Multilateral (11-801) – Agreement Concerning the Replacement of Highly Enriched Uranium by Low Enriched Uranium hide Multilateral (11-801) – Agreement Concerning the Replacement of Highly Enriched Uranium by Low Enriched Uranium TIAS Office of Treaty Affairs August 1, 2011 Energy: Uranium for Nuclear Reactor Agreement signed at Vienna July 13, 29, and August 1, 2011; entered into force August 1, 2011. With annexes. Download attachment [935 KB] Tags Energy Multilateral Treaties