"It will be very soon. It will be in the coming days," Hamid Reza Assefi told a press conference here, when asked when Tehran's report would be delivered to the International Atomic Energy Agency (IAEA).
"We hope that there will be no more misunderstandings... and that the attitude towards Tehran's nuclear situation will return to normal," he added.
"We have held very useful negotiations (with the IAEA's experts) and many questions have been cleared up," he said.
Under the additional protocol of the nuclear Non-Proliferation Treaty, which Iran signed amid great fanfare last December, the government is required to provide a full report on its nuclear programme by mid-May.
This document -- required to be more complete than a previous one filed in October -- comes against a backdrop of US allegations that Iran is secretly developing nuclear weapons.
Iranian media reported that a new team of IAEA inspectors had arrived in the country on Saturday. The experts are due to file their own report on Iran's nuclear program ahead of a board meeting of the 35-nation IAEA on June
However, IAEA Director General Mohamed ElBaradei warned on Saturday that Iran's cooperation so far had been insufficient and that the UN agency was not convinced of the peaceful intentions of its nuclear programme.
"We do not see the kind of cooperation we would like to see from Iran," ElBaradei told CNN.
"Iran has the technology to produce highly enriched uranium, which does not automatically mean (the manufacturing of) nuclear weapons," he said.
"They are saying that they are not trying to convert (uranium) into weapons, and what I am saying is that the jury is still out," he added.
"We are not in a position that to say that Iran's program is exclusively for peaceful purposes nor can we jump to the conclusion that it is a weapons program," ElBaradei added.
Diplomats close to the IAEA said on Friday that agency inspectors saw a pattern of radiation contamination in Iran which could indicate attempts to enrich uranium to bomb-grade level. Tehran has been asked to explain the patterns in question in its new report.
The former Iranian president Akbar Hashemi Rafsanjani charged on Sunday that the United States was alarmed about Iran's technological progress.
"The Americans are worried about our scientific progress and are trying to scare the world by saying that Iran is on the verge of a major nuclear mutation," he was quoted as saying by Iran's official IRNA news agency.
"It is true, we are on the verge of a nuclear transformation, but we are not seeking atomic weapons... even for deterrent ends," he said, adding that Iran "hoped to use other means of deterrent".