** FILE ** North Korea's spent nuclear fuel rods, kept in a cooling pond, are seen at the nuclear facilities in Yongbyon, North Korea, about 60 miles north of the capital, in this 1996 photo released by South Korea's Yonhap News Agency in 2003. (AP Photo/Yonhap News Agency, File)

Photo by:

** FILE ** North Korea's spent nuclear fuel rods, kept in a cooling pond, are seen at the nuclear facilities in Yongbyon, North Korea, about 60 miles north of the capital, in this 1996 photo released by South Korea's Yonhap News Agency in 2003. (AP Photo/Yonhap News Agency, File)