vienna iran remain within main limit nuclear activity set 2015 deal six world power u.n. atomic watchdog say first report since u.s. president donald trump decertified iranian compliance term iran undertake curb uranium enrichment program return relief international sanction cripple economy u.n. nuclear inspectors repeatedly verify tehran adherence key aspects accord trump call agreement iran unite state britain france germany russia china european union bad deal ever disavow iran compliance last month decision constitute u.s. exit accord raise concern stay power trump move odds commitment party deal mean u.s. congress must decide mid-december whether reimpose economic sanction lift accord reach predecessor barack obama congress reimpose sanction unite state would effect violation deal would likely fall apart lawmakers nothing deal remain place response iranian supreme leader ayatollah ali khamenei say tehran stick nuclear accord long signatories respect would shred deal washington pull deal unravel would strengthen hardline opponents hassan rouhani iran pragmatist president open diplomatic channel western power enable nuclear diplomacy years worsen confrontation iran stock low-enriched uranium nov. 96.7 kg 213.2 pound well 202.8-kg limit set deal level enrichment exceed maximum 3.67 percent cap say confidential international atomic energy agency report send iaea member state see reuters iran stock so-called heavy water moderator use type reactor produce plutonium potential nuclear bomb fuel stand 114.4 metric tonnes 130-tonne limit agree party deal 3.67 percent enrichment 202-kg stockpile limit uranium 130-tonne cap heavy water aim ensure iran amass enough material sufficient fissile purity produce nuclear bomb device require uranium refine around 90 percent purity iaea director general yukiya amano tell reuters september would welcome clarification power agency monitor iran implementation so-called section nuclear pact deal certain technologies could use develop atom bomb russia critical agency monitor section provision monday report say iaea verify iran commitment section iran stick key limit nuclear deal u.n. watchdog report