In a statement on its Web site, the agency said core discharge activities at the reactor would resume Tuesday and inspectors would reapply containment and surveillance measures.

North Korea said last Thursday it would not allow the nuclear watchdog's inspectors back and had earlier threatened to resume its nuclear program but reversed course after the United States removed the secretive communist regime from its list of terror-sponsoring nations.

The agency said it had not yet been briefed on verification measures agreed to by the United States and North Korea.

Efforts have been under way to convince North Korea to give up its nuclear program in exchange for economic and energy aid. The six-party talks -- which include both Koreas, the United States, Japan, China and Russia -- have been stalled over verification procedures.