Showing posts with label yellowcake. Show all posts
Showing posts with label yellowcake. Show all posts

Saturday, December 25, 2021

Update on the Pakchon Uranium Mill

The Pakchon Uranium Concentrate Pilot Plant is the first uranium concentration plant in North Korea and is one of only two known to exist, the other being the Pyongsan plant

Operations at Pakchon take uranium-bearing ore (usually from coal) and concentrate it into 'yellowcake' which has a uranium concentration of 99% pure U-238, a low radioactivity, long half-life form of uranium. From here, it is sent to other sites (such as Yongbyon) where it is converted into highly enriched U-235 which can be used for bomb production.

However, its operations have been scaled down and it has been in caretaker status since perhaps as far back as 2002.

But although uranium production has been shunted to the more modern Pyongsan, Pakchon's caretaker status certainly doesn't mean abandoned. Recent satellite imagery suggests at least some limited operations are still ongoing and that the regime has been fairly active in maintaining the complex. The continued importance of Pakchon in the country's nuclear program is evidenced by the fact that the United States was interested in having it permanently closed and dismantled as one of five nuclear facilities offered up by North Korea in exchange for sanctions relief. 

When I first wrote about the site in 2019, I noted two buildings that were either being demolished or that had been left to fall apart. Since then, commercial satellite imagery from Sept. 14, 2021 shows that one of those buildings has been completely reconstructed. Additionally, a repaired section of roof on the main milling building can be identified.

The imagery also shows that the complex's administrative section has seen construction and that the waste material reservoir is still being used.

The nearby mine that provides uranium-bearing ore has also been continually active. Whether it's sending its full production to the Pyongsan Uranium Mill or diverting small amounts to Pakchon, I can't say, but the improvements made at Pakchon suggests that the ore from the mine would likely one day be sent back to Pakchon if it becomes reactivated in the future.


Taking these changes one-by-one, the first I'll talk about is the reconstruction of the thermal building which provides extra electricity for the plant. 

Thermal plant as seen on March 19, 2012.

In the above image from 2012, the thermal plant complex is clearly visible. Coal is housed in the bulk storage building where it is then moved uphill via a conveyor belt to the generating hall. The coal ash is then dumped outside of the building in a pile next to the conveyor where it accumulates until removed.

In 2019, the generator hall was being demolished.


By October 2019, the generating hall had been torn down to its foundations.

There is a gap in the Google Earth imagery, but by September 2021, a new structure can be seen.


The absence of a conveyor system, either above or below ground, suggests that construction to modernize the plant may not yet be complete.

Nearby are two other unidentified support buildings that have been left to fall apart.

Building #1 has a partially collapsed roof while building #2 is missing its roof entirely.

 

In this image, from right to left, you can follow the production process as described by the Center for Strategic International Studies.

The September 14, 2021 image also shows that a section of roof has been repaired in the section of the production building that is responsible for drying and filtering the yellowcake uranium before it is shipped out.


Pakchon's waste reservoir is split into two reservoirs, an upper and a lower one, divided by an earthen dam. The area of the reservoir that is filled with waste is approximately 3.4 hectares, with the upper section usually being filled with water and the lower section containing sludge and newer waste materials.

While the size of the reservoir hasn't changed in at least 17 years, the sludge pool has seen continued activity, particularly in the last few years. 

Beginning in 2019, a new staging area was constructed to accommodate vehicles and other equipment involved in the management of the reservoir. The staging area covers roughly 2,900 sq. .m. 


One other section of the Pakchon complex that has seen recent activity is in the administrative area. In 2019 a new theater/assembly hall was constructed over the course of the year.

The new hall is on top of substantial construction work that happened between 2008 and 2012, when nearly every current structure visible was either renovated or added.

Additionally, the fish farm that exists next to the administrative area had more modern facilities built in 2019-2020. These fish farms can be found throughout the country and help provide needed protein to local workers, military personnel, and the fish can even be exported to earn the country foreign currency.  


While none of this activity suggests full-scale operations have resumed at the concentration plant, it does support the idea that, like Punggye-ri, the site remains part of the country's nuclear program and may be ready to resume limited production should the order come.

As Joseph Bermudez wrote for CSIS back in 2019 about the low-level activity that can be observed, "the most likely explanations for this activity would be small processing runs of iron-bearing ore of some type, caretaker maintenance work, or decommissioning of equipment within the plant." 

However, with the newer imagery and changes, I would like to suggest that some of the activity could be part of pollution mitigation efforts or reprocessing older ore/waste material to extract small amounts of formerly discarded minerals (an activity seen at certain mining sites in recent years).


I would like to thank my current Patreon supporters: Amanda O., GreatPoppo, Joel Parish, John Pike, Kbechs87, Rinmanah, and Russ Johnson.

--Jacob Bogle, 12/24/2021
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Wednesday, August 21, 2019

Slowdown at the Pakchon Uranium Plant?

In the course of researching my article on the toxic leaks at the Pyongsan uranium mine and milling plant, I started observing North Korea's second such facility at Pakchon, North Pyongyan.

Reviewing historical satellite imagery for Pyongsan shows an ever-growing pile of tailings (waste material) and sludge from the mine and factory at its waste reservoir, indicating continual operations. The same cannot be said upon review of the reservoir at Pakchon. A lack of obvious changes to the reservoir recently could mean a few things, which I'll discuss later.

Like Pyongsan, Pakchon was constructed in the 1980s under the leadership of Kim Il Sung (with various degrees of Soviet assistance), and is the second of North Korea's two declared uranium milling plants (where uranium ore is processed into yellowcake). The other plant being Pyongsan, as mentioned earlier. A review of satellite imagery shows the evolution of the Pakchon facility's operations.


Google Earth imagery from 2005 shows that the original tailings dam had been closed and turned into farmland, while a second tailings dam had been established during the intervening years.


By 2014, activity at the dam can still be seen, as new materials are dumped into it via truck (unlike the reservoir at Pyongsan, which has waste material moved via pipe).

The addition of new waste to the dam appears to have slowed down by 2016.


The small sections of the reservoir that were active in 2014 no longer seem to be undergoing change, and there isn't much (if any) additional activity as evidenced by the lack of surface disturbances.


The general lack of new waste deposits has continued into 2019. Any changes to the reservoir from 2016 and 2019 are very minimal, indicating a lack of production. By comparison, the growth of the "sludge pile" within the Pyongsan tailings reservoir grew substantially.


The Pyongsan plant is much larger than Pakchon and processes coal with a uranium concentration of 0.26%, compared to Pakchon's 0.086%. Both are considerably low-quality concentrations by most definitions but seem to be among the best ore the country has domestic access to.


The sludge pile within the Pyongsan reservoir occupied some 69,000 square meters of space by May 2017.

The pile had grown to approximately 87,000 square meters by March 2019, an apparent increase of 26%. An exact figure can be difficult to ascertain because water levels may have changed slightly over time.


The only area of Pakchon that seems to have maintained activity is the associated mine, 1.3 km south of the main factory building.


Aside from monitoring tailings, the physical state of the factory complex gives us more information.

The main building is roughly 120x100 meters, but there are several other buildings involved in the process of concentrating and milling the uranium. The administration section of the complex seems perfectly fine, but two industrial buildings are falling apart, and one of those is in the process of being demolished.


Google Earth imagery from March 19, 2012 gives a clear view of the two buildings of interest. They are in good order and appear functional.


By March 2019, the roof of building #1 has several holes in it and building #2 has been torn down.

What does all of this mean?

It would make sense that Pyongsan would be the country's primary facility, as the ore used is of much greater quality than the ore at Pakchon. Indeed, Pyongsan underwent a refurbishment in 2014-2015, with additional improvements being seen even more recently. But is Pakchon slowing down?

A lack of obvious waste deposits and the fact that some of the buildings have been neglected or demolished points to problems. Mining operations have continued, but there doesn't seem to be a new tailings dam that would explain the lack of activity at the current one. The mine has settling/separation ponds but doesn't appear to have a dedicated spot to hold waste from the processed material. This could indicate that the country is stockpiling material for processing but has cut back on the overall amount of milled uranium it can produce at Pakchon. This may be backed up by the fact that, at least for 2019, even work conducted at Yongbyon has been scaled back.

Another possibility is that there are problems with the factory itself. North Korea's industrial sector has long been crippled for its lack of spare parts and its general inability to repair and replace complex equipment in a timely fashion. Additionally, uranium processing is expensive and energy intensive. During the early days of North Korea's nuclear program, the Soviet Union told them that it wasn't economically feasible to extract the low-quality uranium sources within the country. Nonetheless, Kim Il Sung persisted. The energy intensive and expensive nature of the process may have finally caught up with them, leading to scaling back Pakchon.

Pakchon has never operated every single day, but this prolonged period with little to no activity is a change from the time under Kim Jong Il. It will take more observations to know exactly what is happening, but for now, Pakchon certainly doesn't seem to be operating at its full capacity.


--Jacob Bogle, 8/21/2019
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