; (B) the Committee on Foreign Relations and the Committee on Appropriations of the Senate; and (C) the Committee on Foreign Affairs and the Committee on Appropriations of the House of Representatives. 7413. Monitoring Iranian enrichment of uranium-235 (a) Significant enrichment activity defined In this section, the term significant enrichment activity means— (1) any enrichment of any amount of uranium-235 to a purity percentage that is 5 percent higher than the purity percentage indicated in the prior submission to Congress under subsection (b)(1)