The Collapse of a Boiler Tower at Ulsan Thermal Power Plant
On the 6th, during the dismantling of a boiler tower at the Korea East-West Power Ulsan Thermal Power Plant, the structure collapsed, resulting in a second day of rescue operations for those who were buried beneath the debris. Multiple analyses are being conducted to determine the cause of the incident.
According to fire authorities and other sources on the 7th, the 60-meter-tall boiler tower at the Ulsan Thermal Power Plant in Yongjam-dong, Nam-gu, Ulsan, collapsed around 2:02 p.m. on the 6th. This steel structure, used for generating electricity by boiling water, is comparable in size to a 15-story building. The collapse was accompanied by a loud “thud” that could be heard even 200 meters away from the site.
Korea East-West Power stated that the tower was completed in 1981, 44 years ago, and it generated electricity for about 40 years before being decommissioned in 2021. The company commissioned HJ Shipbuilding & Construction Co. for the demolition work, with Korea Kako acting as a subcontractor. The weakening work, which involved pre-cutting steel supports to make the structure easier to demolish via blasting, began last month.
The collapse occurred while workers were cutting part of the structure at a height of 25 meters using tools such as oxygen cutters. Industry sources suggest that the accident may have been caused by uneven weight distribution during the process, leading to a shift in the center of gravity. Similar to how a tree falls toward the side where more axe strikes are made, the boiler tower might have collapsed in a similar fashion.
During a briefing at the scene, fire authorities noted, “Since the columns of the structure were being cut, there might have been issues such as instability or tilting.” This raises questions about whether proper safety measures were taken before the work began. Even if the center of gravity shifted, it is essential to verify whether there were wires (ropes) or support devices in place to prevent the tower from falling.
An industry official who visited the site immediately after the accident mentioned, “Whether wire work was done to support the boiler tower’s weight in preparation for potential collapse could be a key point in determining the cause. Since wire work takes a long time, it is necessary to check if it was omitted.”
Another possibility is that the structure twisted during the work. Typically, large structure demolitions start from the top to maintain balance. Considering that workers were at a height of 25 meters at the time of the accident, it is likely that supports or columns were concentrated in that area.

The issue is that the columns or supports might have aged beyond expectations, causing them to twist instantly under minor impact and tilt to one side. This could have contributed significantly to the collapse.
The Ministry of Employment and Labor plans to actively pursue a criminal investigation, including seizure and search, to determine the cause of the accident. As the investigation continues, more information is expected to emerge regarding the specific factors that led to this tragic event.















