The Asahi newspaper reported on Saturday that the government is planning an extension of up to three years in areas such as Iitate, a village northwest of the plant where a highly radioactive plume spread in the first few days of the crisis.
Still, an International Atomic Energy Agency mission that visited the Fukushima area last week highlighted the progress Japan has made in the two years since the team's previous visit.
"The main conclusion of the mission is that Japan has achieved important progress," team leader Juan Carlos Lentijo told a news conference in Tokyo on Monday.
In a preliminary report released Monday, the team noted good progress in the remediation of farmland in some areas, and monitoring that has shown the land can produce food with levels of radioactivity below the permissible level. It also praised Japan's efforts to involve stakeholders, noting that the leadership of some key local figures has helped gained the trust of their communities.
Lentijo also stressed the need to strengthen communication with the public about the decontamination work and the costs and benefits.
The 16-person team of international experts and IAEA staff visited Kawauchi, a village that has been partially opened to residents again. About 40 percent of its population of 3,000 has returned.
Beyond decontamination, other challenges in the affected areas include ensuring food safety and jobs.
___
Associated Press writer Yuri Kageyama contributed to this story.