Japan's exploration of the island of Minamitorishima for nuclear waste storage has raised global concerns over tsunami and flooding risks.
Japan has raised global concern, after reportedly taking initial steps to explore a tiny Pacific island as a potential final disposal site for high-level radioactive waste .The plan involves the island of Minamitorishima , a coral atoll in the northwestern Pacific Ocean .
It is the nation’s easternmost territory, located roughly 1,200 miles southeast of Tokyo.Minamitorishima spans just 0.58 square miles and has no residents, apart from a small number of government personnel and military staff. Its remoteness is precisely what makes it attractive for a long-term nuclear waste site capable of lasting up to 100,000 years.A formal request to evaluate the atoll’s suitability was handed to Kazuo Morishita, the mayor of the Ogasawara village, which administratively oversees the island, in March 2026. However, the move quickly raised concerns among experts and environmental groups, who believe it may create new risks.Storing nuclear wasteNuclear waste is one of the world’s most pressing and unresolved environmental challenges, and its volumes continue to rise. More than 440,000 US tons of spent fuel have been discharged from reactors around the world. Japan is no exception to the issue. Since its first reactor began operating in 1966, the Tōkai Nuclear Power Plant , the country has accumulated thousands of tons of spent nuclear fuel and vitrified high-level waste. About 2,500 canisters of vitrified high-level radioactive waste are currently stored in facilities in Aomori and Ibaraki prefectures. But these are considered temporary solutions.To address the challenge, officials have begun looking for a permanent repository that can safely isolate radioactive material deep underground, typically at depths of at least 980 feet for long-term containment.Finland has already turned this concept into reality after it developed the world’s first permanent disposal facility of high-level spent nuclear fuel, the Onkalo deep geological repository in Olkiluoto. The facility stores waste in copper canisters embedded up to 1,480 feet deep in stable granite bedrock. It is designed to safely isolate radioactive material for up to 100,000 years.Japan’s waste dilemmaInspired by Finland’s novel approach, Japan is now exploring Minamitorishima’s potential for nuclear waste storage, citing practical advantages. Similar requests have also been made to two towns in Hokkaido. The request to conduct a survey on the island was made by the Nuclear Waste Management Organization of Japan . “There are certainly pros and cons for Minamitorishima as the repository,” Kazuto Suzuki, PhD, a science and technology professor at Tokyo University, said.According to the South China Morning Post , with no civilian population, the government would not face the same level of local opposition seen in other regions. The island already hosts basic infrastructure, including a runway and port facilities.However, Tokyo-based anti-nuclear organization the Citizens’ Nuclear Information Centre issued a report citing some major concerns. One of them is the lack of detailed geological research on the atoll and its surrounding seabed. In contrast to mainland sites that have been extensively studied, Minamitorishima remains relatively underexplored. In addition, the island’s porous limestone and volcanic base raise concerns about stability, with leaks risking marine ecosystems.Moreover, the atoll is vulnerable to typhoons, storm surges, as well as long-term sea level rise. This means any underground site must withstand saltwater, extreme weather, and potential tsunamis. As per William A. Parkinson, a senator in the legislature of Guam, the logistics of transporting nuclear waste to the remote island also present a challenge. “The issue is not ordinary commerce or tourism but the long-term handling, transport, storage, and possible burial of the most persistent and hazardous radioactive wastes created by human industry,” he said.Still, interest in Minamitorishima goes beyond nuclear waste. The remote island is also considered a base for extracting rare earth minerals from the seabed. The plan remains early-stage, with surveys set to evaluate the atoll.
Flooding Japan Minamitorishima Nuclear Waste Disposal Nuclear Waste Management Pacific Ocean Physics Radioactive Waste Remote Island Tsunami
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