North Korea received an initial shipment of oil aid Saturday promised as a reward for its pledge to shut down its main nuclear reactor as the communist nation was poised to take its first step in nearly five years to scale back its weapons program. UN inspectors arrived in Pyongyang on Saturday to monitor the shutdown of the North's plutonium-producing reactor at Yongbyon, about 60 miles northeast of the capital, China's official Xinhua News Agency reported. The 10-member team from the International Atomic Energy Agency was expected to head to the Yongbyon facility later in the day. The Saturday delivery of oil was part of 50,000 tons of heavy fuel oil the North has been promised in exchange for shutting down the Yongbyon reactor. Pyongyang will eventually receive aid equivalent to a total 1 million tons of oil for dismantling its nuclear program.