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The Government of Japan (hereinafter referred to as the "Lessee"), and the United States Atomic Energy Commission (hereinafter referred to as the "Lessor"), acting on behalf of the Government of the United States of America, with respect to the lease of special nuclear material pursuant to the Agreement for Cooperation between the Government of Japan and the Government of the United. States of America Concerning Civil Uses of Atomic Energy, signed November 14, 1955,^[2] and as it may be amended or superseded, and subject to all of the terms, conditions, provisions, and guaranties contained therein, agree as follows:

A. The Lessor agrees to lease to the Lessee and the Lessee agrees to lease from the Lessor, a quantity of enriched uranium not to exceed four (4) kilograms of contained U-235 in uranium enriched to nineteen and one-half per cent (19.5%) to twenty per cent (20%) to be contained in fuel elements to be prepared in the United States of America by a contractor engaged by the Lessee (hereinafter called the Contractor"), for use in the operation of a heavy water research reactor manufactured by AMF Atomics, Inc., to be located at the Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaragi-ken, Japan, plus, upon request from the Lessee, such additional quantity as, in the opinion of the Lessor, is necessary to permit the effective and continuous operation of the reactor while replaced fuel elements are radioactively cooling in Japan or while fuel elements are in transit, or in the case where any significant amounts of fuel elements are accidentally lost or destroyed, it being the intent of the Lessor to make possible the maximum usefulness of the four (4) kilograms of said material. It is understood that the above enrichment specifications shall not necessarily apply to the enrichment of the uranium leased to the Lessee for use in fission chambers for the reactor, and that