ABC News Exclusive: Inside a North Korean Nuclear Plant

Yet as all sides remain engaged in dialogue, the North Koreans have said they will continue to keep the cooling tower at Yongbyon closed, which makes it impossible for them to make nuclear power. This level of cooperation is encouraging, but it is not enough for the U.S. government, which still wants North Korea to admit that it had a uranium program.

Bob Woodruff is the first journalist to visit the nuclear plant in Yongbyon, North Korea.

(ABC )

In addition, suspicions have been raised that North Korea has engaged in nuclear proliferation; working with other nations, such as Syria, to develop their nuclear programs. Yet when I questioned Ri Young Ho, the director of safety at the Yongbyon Nuclear Facility, he denied those accusations.

"We believed that this kind of rumor is made by people, people who do not like the progress in the six-party talks," he said.

Though the North Koreans may not be doing exactly what the U.S. government and other nations had hoped for, this remarkable visit is a clear sign that they are anxious to demonstrate that they are keeping their side of the agreement.

ABC News' Meena Hartenstein contributed to this report.