Nuclear-contaminated wastewater is released from the TEPCO Fukushima Daiichi nuclear power plant into the ocean on August 24, 2023.Photo: VCG

The recent report of 25 tons of radioactive water leaking from Tokyo Electric Power Company (TEPCO)'s troubled Fukushima Daiichi Nuclear Power Plant once again exposes TEPCO's internal management chaos. It also highlights the unreliability and risks associated with Japan's moves to dump nuclear-contaminated wastewater into the sea, analysts said. 

Approximately 25 tons of water containing radioactive materials leaked into the spent fuel cooling pool of Reactor Unit 2 in the Fukushima plant. TEPCO has stopped water injection into the pool and is investigating the cause of the leak. To ascertain the precise location of the leak and its underlying cause, TEPCO plans to deploy robotic equipment for an inspection scheduled for this week, Japanese media NHK reported on Tuesday.  

Although TEPCO claims that there has been no discharge into the outside environment, the report raises concerns about Japan's current practice of dumping nuclear-contaminated wastewater into the sea given TEPCO's notorious history of cover-ups related to the Fukushima disaster, analysts said. 

This incident exposes TEPCO's internal management chaos and disorganization. Lü Chao, a research fellow at the Liaoning Academy of Social Sciences said that both TEPCO and the Japanese government bear major responsibility for handling the Fukushima nuclear-contaminated wastewater and should be transparent about any incident that has occurred in Fukushima. 

Despite using the International Atomic Energy Agency (IAEA)'s report as a shield, Japan continues to dump nuclear-contaminated wastewater into the ocean, disregarding objections from neighboring countries and calls for international oversight. If this attitude continues, it could lead to further catastrophic incidents, causing severe and irreversible damage to the ocean and the environment, Lü told the Global Times on Wednesday. 

As of press time on Wednesday, IAEA has not responded to Global Times' inquiries on the incident. 

This is not the first time this has happened in the Fukushima plant. In February, approximately 5.5 tons of wastewater, which may contain 22 billion becquerels of radioactive materials such as cesium and strontium have leaked from equipment at the nuclear power plant. Also, in October, 2023, five workers were accidentally splashed with liquid containing radioactive materials while cleaning at the Fukushima No. 1 nuclear power plant, according to Japanese media. 

On August 7, despite persistent opposition at home and abroad, Japan started its eighth round of dumping of nuclear-contaminated wastewater into the Pacific Ocean. In response, the spokesperson for the Chinese Embassy in Japan said in a statement that Japan is irresponsibly shifting potential pollution risks onto the entire world. It is continuously discharging nuclear-contaminated wastewater into the ocean without addressing international concerns about the safety of the discharge, the long-term reliability of the purification equipment and the effectiveness of monitoring arrangements. 

The spokesperson urged Japan to fully cooperate in establishing a comprehensive, independent and effective long-term international monitoring arrangement involving relevant stakeholders, including neighboring countries.