Tehran's decision will see cameras put back at Karaj centrifuge parts workshop, which came under what Iran describes as a sabotage attack in June.
The warning came as world powers and Iran gather in Vienna to salvage the 2015 nuclear deal after a five-month hiatus.
"We have passed 120 kilogrammes," says Mohammad Eslami, head of the Atomic Energy Organization of Iran.
Iran agrees to allow international inspectors to install new memory cards into surveillance cameras at its sensitive nuclear sites and to continue filming there, averting a diplomatic showdown this week.
Iran has accused Israel of several attacks on facilities linked to its nuclear programme and killing its nuclear scientists over the past years. Israel has neither denied nor confirmed the allegations.
Authorities say they thwarted attempted sabotage that targeted a sprawling nuclear centre located in Karaj city, just some 40 kilometres northwest of Tehran.
Lawmakers agree to "stop the surveillance of the IAEA spies" of Iranian nuclear facilities in response to assassination of top nuclear scientist Mohsen Fakhrizadeh.
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