Inspectors from the International Atomic Energy Agency (IAEA) will visit the nation's main nuclear research center for the second time Tuesday to continue investigating South Korea's past nuclear activities.

The group of five inspectors will revisit the Korea Atomic Energy Research Institute in Daejeon, some 160 km south of Seoul, to interview the scientists that took part in a nuclear experiment in 2000 that led to the production of a minimal amount of enriched uranium.

Once they conclude their investigations in the main nuclear research center, the IAEA officials are expected to focus on details surrounding Seoul's revelation that it produced more than 150 kilograms of uranium metal in the 1980s at three facilities.

The IAEA team is also expected to visit an atomic lab in Seoul to supplement data gathered from the first round of inspections and to take a sample of the 0.08g of plutonium extracted in 1982.

The investigating officials flew into South Korea on Sunday for the second inspection in less than a month into the controversial laboratory experiments, which Seoul claims were unauthorized tests conducted by renegade scientists.

This week's inspection will last until Saturday. The IAEA team is scheduled to leave the country on Sunday.