The IAEA describes the renewed activities at North Korea’s nuclear plant as “very worrying.”

The United Nations atomic watchdog said in an annual report that North Korea appears to have restarted a nuclear reactor that is widely thought to have produced plutonium for nuclear bombs, emphasising the isolated nation’s efforts to build its arsenal.

The signals of functioning at the 5-megawatt (MW) reactor, which is thought to be capable of produce weapons-grade plutonium, were the first noticed since late 2018, according to the International Atomic Energy Agency in a Friday report.

“Since early July 2021, there have been indications, including the discharge of cooling water, consistent with the operation,” the IAEA report said of the reactor at Yongbyon, a nuclear complex at the heart of North Korea’s nuclear programme.

The IAEA has had no access to North Korea since Pyongyang expelled its inspectors in 2009. The country subsequently pressed ahead with its nuclear weapons programme and soon resumed nuclear testing. Its last nuclear test was in 2017.

The IAEA now monitors North Korea from afar, largely through satellite imagery.

Commercial satellite imagery shows water discharge, supporting the conclusion that the reactor is running again, said Jenny Town, director of the U.S.-based 38 North project, which monitors North Korea.

“No way to know why the reactor wasn’t operating previously – although work has been ongoing on the water reservoir over the past year to ensure sufficient water for the cooling systems,” she said.

“The timing seems a little strange to me, given the tendency for flooding in coming weeks or months that could affect reactor operations.”

Last year 38 North said floods in August may have damaged pump houses linked to Yongbyon, highlighting how vulnerable the nuclear reactor’s cooling systems are to extreme weather events.

Seasonal rains brought floods in some areas this year, state media have said, but there have been no reports yet of threats to the site, the Yongbyon Nuclear Scientific Research Center.

FILE PHOTO – A North Korean flag flies on a mast at the Permanent Mission of North Korea in Geneva October 2, 2014. REUTERS/Denis Balibouse/File Picture

KEY NUCLEAR SITE

At a 2019 summit in Vietnam with then-U.S. President Donald Trump, North Korean leader Kim Jong Un offered to dismantle Yongbyon in exchange for relief from a range of international sanctions over nuclear weapons and ballistic missile programmes.

At the time Trump said he rejected the deal because Yongbyon was only one part of the North’s nuclear programme, and was not enough of a concession to warrant loosening so many sanctions.

U.S. President Joe Biden’s administration has said it reached out to the North Koreans to offer talks, but Pyongyang has said it has no interest in negotiating without a change in policy by the United States.

“There has been no agreement governing these facilities for a long time now,” said Joshua Pollack, a researcher at the James Martin Center for Nonproliferation Studies (CNS).

In June, the IAEA flagged indications of possible reprocessing work at Yongbyon to separate plutonium from spent reactor fuel that could be used in nuclear weapons.

In Friday’s report, the agency said the five-month duration of that apparent work, from mid-February to early July, suggested a full batch of spent fuel was handled, in contrast to the shorter time needed for waste treatment or maintenance.

“The new indications of the operation of the 5MW(e) reactor and the radiochemical (reprocessing) laboratory are deeply troubling,” it said in the report, which was issued without notice.

There were also indications of mining and concentration activities at a uranium mine and plant at Pyongsan, and activity at a suspected covert enrichment facility in Kangson, it added.

It is a safe bet that North Korea intends any newly separated plutonium for weapons, Pollack said, adding that in a speech this year Kim gave a long list of advanced weapons under development, including more nuclear bombs.

“North Korea’s appetite for warheads is not yet sated, it seems.”

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