South Korea has reported no unusual radioactive activity in the Yellow Sea, despite concerns raised by a recent media report alleging North Korea’s discharge of uranium waste into rivers.

The South Korean unification ministry confirmed on Tuesday that regular monitoring efforts have shown no significant change in radiation levels near the maritime border with North Korea. This follows a Daily NK report last month, which claimed Pyongyang had been dumping radioactive wastewater from its uranium refining plant in Pyongsan County, North Hwanghae Province, into rivers that flow into South Korea.

A ministry official, speaking on condition of anonymity, said, “Relevant agencies regularly monitor radiation levels in the Yellow Sea, and so far, no meaningful changes have been detected.” However, the ministry emphasized that it is coordinating closely with other government bodies to evaluate potential environmental and health risks.

The Nuclear Safety and Security Commission (NSSC) also confirmed normal radiation levels nationwide, including at sensitive points such as Ganghwa Island near the North Korean border. Radiation levels across South Korea as of 11 a.m. ranged from 0.059 to 0.212 microsieverts per hour—well within the normal range of 0.05 to 0.3 microsieverts per hour.

Meanwhile, recent satellite images analyzed by Beyond Parallel, a U.S.-based North Korea monitoring initiative, suggest construction activity at a suspected uranium enrichment site in Yongbyon, hinting at the North’s continued efforts to expand its nuclear capabilities.

Seoul continues to monitor the situation closely amid ongoing regional tensions and concerns over the safety of transboundary waters and ecosystems.