FILE - The file photo, taken Dec. 18, 2007, and released June 27, 2008, by the official Chinese news agency Xinhua, shows the cooling tower at the Yongbyon nuclear complex near Pyongyang, North Korea.
FILE - The file photo, taken Dec. 18, 2007, and released June 27, 2008, by the official Chinese news agency Xinhua, shows the cooling tower at the Yongbyon nuclear complex near Pyongyang, North Korea.

WASHINGTON - North Korea's offer to dismantle its Yongbyon nuclear facility should not persuade the United States to lift sanctions, nuclear experts say. Even without the showcase installation, the country can produce two to three nuclear weapons a year in other facilities, they say.

After President Donald Trump met with North Korean leader Kim Jong Un at their summit in Hanoi last month, Trump said at a press conference that he walked away from making a deal on denuclearization because Kim asked the U.S. to lift all sanctions imposed on the country in exchange for dismantling the Yongbyon nuclear facility.

David Albright, president of the Institute for Science and International Security and a former U.N. nuclear weapons inspector, said Trump probably walked away because the U.S. government knows that North Korea can produce nuclear weapons elsewhere.

US President Donald Trump (R) walks with North Kor
FILE - U.S. President Donald Trump, right, walks with North Korea's leader Kim Jong Un during a break in talks at the second U.S.-North Korea summit at the Sofitel Legend Metropole hotel in Hanoi, Feb. 28, 2019.

"One could argue that Yongbyon produces enough plutonium and could be making weapons-grade uranium ... for two, three nuclear weapons a year," Albright said. "They can have enough enrichment facilities outside Yongbyon to make that same number a year."

The Yongbyon nuclear facility is considered North Korea's only plutonium facility with a capacity to enrich uranium. Reprocessing plutonium and enriching uranium are the two pathways of nuclear weapons development

North Korea offered to dismantle the Yongbyon facility twice before.

Pyongyang announced its willingness to dismantle the facility and shut the main reactor in Yongbyon in the early 1990s under an agreement reached with the U.S., but restarted it in 2003 when the deal broke down.

Under a 2007 deal, North Korea said it was willing to dismantle Yongbyon and shut down the reactor, only to reopen it again when that deal fell apart. 

Additional enrichment plants

Jeffrey Lewis, director of the East Asia Nonproliferation Program (EANP) at California's Middlebury Institute of International Studies, said, "The U.S. government believes there are at least two additional enrichment plants."

Lewis said he and colleagues at the Middlebury Institute's James Martin Center for Nonproliferation Studies identified one of those plants

The facility is known as the Kangson enrichment site by the U.S. intelligence community.

Olli Heinonen, former deputy director general of the International Atomic Energy Agency (IAEA), has inspected Yongbyon in the past. He said North Korea could easily hide its uranium enrichment facilities because North Korea uses centrifuge technology to enrich uranium, which allows it to disguise them.

Unused nuclear fuel rods are piled on the shelves
FILE - Unused nuclear fuel rods are piled on the shelves of a warehouse at North Korea's main nuclear plant in Yongbyon, North Korea.

Particularly when you have selected technology North Korea has, which is gas centrifuge enrichment technology, it doesn't use electricity very much," Heinonen said. "It looks like any other industrial workshop, or even a supermarket."

Heinonen stressed North Korea has "very extensive uranium resources" in the country at its disposal that can be extracted and enriched in other facilities.

Hydrogen bombs

Albright said that in addition to enriching uranium for making atomic bombs, North Korea is currently producing deuterium, a rare form of hydrogen needed to make a hydrogen bomb, outside Yongbyon. Hydrogen bombs, also known as thermonuclear bombs, are considered more powerful and thus capable of causing greater damage than atomic bombs. Atomic bombs and hydrogen bombs are two types of nuclear weapons.

Lewis said for a shutdown of North Korea's nuclear facilities to be irreversible, North Korea would need to dismantle them, and "sensitive equipment would need to be destroyed or removed from North Korea, not merely stored."

Experts stressed the denuclearization of North Korea cannot be achieved all at once, or only with the dismantlement of Yongbyon, and said the country needs to declare the list of its nuclear arsenal and allow nuclear inspectors into the country to inspect and verify its dismantlement.

Christy Lee contributed to this report, which originated on the VOA Korean.