North Korea completed construction of this facility, the only declared waste storage site in the country, during the late summer of 1992.[1] This site was built in a very short period of time and was finished just before the arrival of International Atomic Energy Agency (IAEA) inspectors in the fall of 1992. This has led many to believe this facility was built to deceive inspectors. IAEA inspectors were taken to this new site after being told that there was no basement in Building 500.[2] This facility is equipped for storing solid wastes, and is most likely used as a repository of containerized low-level and intermediate-level solid wastes from facilities at the Yongbyon Nuclear Center.[3]

Sources:
[1] Joseph S. Bermudez, Jr., "North Korea's Nuclear Infrastructure," Jane's Intelligence Review, February 1994, p. 79.
[2] Joseph S. Bermudez, Jr., "Exposing North Korea's Secret Nuclear Infrastructure, Part Two," Jane's Intelligence Review, August 1999.
[3] David Albright, "How Much Plutonium Did North Korea Produce?," in David Albright and Kevin O'Neill, eds., Solving the North Korean Nuclear Puzzle (Washington, D.C.: Institute For Science And International Security, 2000), pp. 152-153.