UN nuclear chief is visiting Japan to give a final report

TOKYO — The head of the U.N. nuclear agency is in Japan to meet with government leaders Tuesday and to see final preparations for the release of treated radioactive wastewater into the sea from the damaged Fukushima nuclear plant, on a visit Japan hopes will give credibility to the contentious plan.

International Atomic Energy Agency head Rafael Mariano Grossi will meet with Prime Minister Fumio Kishida later Tuesday to submit IAEA’s final report on the water release. All of IAEA’s interim evaluations have been positive and the final report is expected to say that the water sampling, testing and monitoring plans involved in the release are adequate and fulfill international requirements.

The treated radioactive water, stored in about 1,000 tanks that are nearing their 1.37 million ton capacity, must be removed to prevent accidental leaks and to make room for the plant’s decommissioning.

Japanese regulators finished their final safety inspection of the equipment last Friday and the plant operator Tokyo Electric Power Company Holdings is expected to receive a permit for discharging the water in about a week. It could do so anytime afterward, though the start date is still undecided amid concerns and protests.

South Korea, China and some Pacific Island nations oppose the water release because of safety concerns and political reasons. Local fishing groups are worried their reputation will be damaged even if their catch is uncontaminated, and others like local water and beach businesses and tourism outfits are concerned.

Japan has sought support from the IAEA to gain credibility for the plan and assurances that its safety measures meet international standards. The IAEA has made several trips to Japan since early 2022 but acknowledges it can’t made decisions for the Japanese government, including stopping the wastewater release.

Grossi on Tuesday will also meet with heads of Japanese ministries and nuclear agency relevant to the water release. He later will visit the Fukushima plant, which was damaged by a massive earthquake and tsunami in 2011, during his four-day visit.

To ease concerns overseas, Grossi is expected to visit South Korea, New Zealand and the Cook Islands after his visit to Japan.

Japan’s government and TEPCO say the treated but still slightly radioactive water will be diluted to levels safer than international standards and will be released gradually into the ocean over decades, making it harmless to people and marine life.

Some scientists say the impact of long-term, low-dose exposure to radionuclides is unknown. Others say the release plan is safe but call for more transparency in sampling and monitoring of the release.

The government says questionable documents have been circulated, including one alleging that Japan pressured the IAEA to remove negative information from its final report. Foreign Minister Yoshimasa Hayashi and other officials have denied them.