Japan is asking the UN's nuclear agency to set up a permanent office in Fukushima to monitor its efforts to contain the world's worst nuclear accident since Chernobyl, according to officials.

The news came as an International Atomic Energy Agency (IAEA) team of experts began examining Japan's safety checks on idled nuclear reactors.

Tokyo wants an international seal of approval for the energy-hungry country's nuclear industry to bolster its faltering efforts at reassuring the public it is safe to resume atomic operations.

The vast majority of Japan's 54 commercial nuclear reactors are offline because popular opposition is preventing their being restarted in the wake of the Fukushima nuclear crisis.

The disaster, triggered by the March earthquake and tsunami, contaminated the environment and forced tens of thousands of residents around the Fukushima nuclear site, in northeast Japan, to evacuate their homes.

Many still do not know if or when they will be able to return.

Utility companies say Japan will experience severe power shortages if nuclear electricity production is not re-started.

"We are making contact with the International Atomic Energy Agency to see what's possible after we received requests from Fukushima that it hoped IAEA will have a permanent presence in the area," a Japanese diplomat told AFP, under the customary condition of anonymity.

Foreign Minister Koichiro Gemba, whose parliamentary constituency is in Fukushima, told residents on Sunday that he was making the push after requests from local leaders.

"We are calling on IAEA Director-General Yukiya Amano for the international agency's constant presence," he said in a speech, according to Jiji Press.

The announcement coincided with a visit by a 10-member team of experts, led by James Lyons, IAEA director of nuclear installation safety.

At the request of the Japanese government, Lyons' team will review Japan's "stress test" before Tokyo approves nuclear reactor re-starts.

The Vienna-based IAEA has offices around the world -- including in Tokyo -- but it does not normally have permanent bases to monitor commercial reactor sites.

The Tokyo government has struggled with public trust on the nuclear issue since the March disaster.

That drive appeared to have suffered a further setback on Monday when it was revealed the body set up to manage Japan's unfolding atomic catastrophe at Fukushima kept no records of its meetings.

The government's nuclear disaster task force, headed by then prime minister Naoto Kan and including all of his ministers, has no minutes of the meetings that approved the evacuation of people living near the exploding reactors.

The Cabinet Office, in charge of keeping all public records, said it has told the agency to study what it can do to create a written record of the decision-making processes.