Iran cancelled an IAEA inspector's accreditation last week after she claim to have found traces of explosive nitrates before entered the Natanz nuclear plant.
US Secretary of State Mike Pompeo accused Iran of "an outrageous and unwarranted act of intimidation", while the European Union voiced "deep concern" over the incident.
"Based on our needs and what we have been ordered, we are now producing five percent", said Atomic Energy Organisation of Iran spokesman Behrouz Kamalvandi.
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The alarm during a check at the entrance to the plant in central Iran had raised concerns that she could be carrying a "suspect product" on her, Iran's Atomic Energy Organization said in a statement posted online.
He further said that the IAEA experts are expected to arrive in Iran on Sunday to carry out verification tests on the samples. "We call on Iran to immediately resolve all open issues with the IAEA and to afford agency inspectors the privileges and immunities to which they are entitled", he added.More news: Erdogan said that the security services seized the wife of al-Baghdadi
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Kamalvandi also said Saturday Iran is prepared, if necessary, to release footage of an incident with a United Nations nuclear inspector last week that led to it canceling her accreditation.
"IAEA inspectors must be allowed to conduct their critical work unimpeded".
The deal set a 3.67 percent limit for uranium enrichment but Iran announced it would no longer respect it after Washington unilaterally abandoned the agreement past year and reimposed crippling sanctions.
The JCPOA was singed in 2015 in Vienna by Iran, the EU, China, France, Russia, the UK, Germany and the US.
In a reaction to the USA withdrawal from the landmark 2015 Iranian nuclear deal in May 2018 and the subsequent sanctions, and in a response to the Europe's sluggishness in facilitating Iran's banking transactions and its oil exports, Iran, since six months ago, has staged moves to drop its nuclear commitments.