The Tokyo Electric Power Company(TEPCO) has notified South Korea that it is pushing to reduce the number of radioactive substances tested for in the Fukushima nuclear power plant's wastewater before it is released in the spring.

According to documents obtained by Democratic Party lawmaker Lee Jae-jung from Seoul's foreign ministry and the Nuclear Safety and Security Commission, the Japanese entity plans to measure the levels of 31 radioactive substances contained in the contaminated water instead of the original 64.

The ministry said the adjustment, which was shared by Tokyo during director-level talks in late December, was requested by a task force at the International Atomic Energy Agency, which is verifying the safety of Japan's water release plan.

Japan's Nuclear Regulation Authority has been reviewing the revised plan submitted by the TEPCO for three months but has yet to issue a decision.

The foreign ministry said it will continue to prioritize the safety of the South Korean public as it deals with the issue, maintaining the stance that the wastewater should be handled in a scientific manner in accordance with international law.