Decision to Dismantle Units 4 and 6
The Central Disaster Management Headquarters (CDMHQ) made a significant announcement on the 8th, stating that it has decided to dismantle Units 4 and 6 near the accident site. This decision was made due to increased concerns about potential additional collapses, following the collapse of Boiler Tower Unit 5 at the Ulsan Thermal Power Plant. Rescue operations had previously encountered challenges, including the inability to deploy large equipment, because of fears of further structural failures.
Involvement of Victims’ Families
The decision to dismantle the towers was reached during a meeting held at 11 p.m. the previous day. Representatives from the families of the victims were present during this discussion. Units 4 and 6, which are located next to the collapsed Unit 5, have already completed most of the weakening work required for their demolition. The weakening process involves pre-cutting solid pillars and supports to allow the structure to be brought down in one controlled operation.
Progress on Weakening Work
In the case of Unit 5, the collapse occurred when the weakening work was 90% complete. Unit 4, which is approximately 30 meters away, has achieved 100% completion of the weakening work, while Unit 6 is at 75% completion. This progress indicates that the structures are nearing the stage where they can be safely dismantled.
Concerns About Safety
During a briefing by fire authorities at the site on the morning of the 8th, it was noted that “even with strong winds, there are concerns about the danger (of Units 4 and 6),” and “if large cranes are deployed, strong vibrations could cause secondary damage.” These statements highlight the risks involved in handling the remaining structures.
Ongoing Rescue Efforts
At the site, rescue workers are conducting searches by entering the gaps of collapsed structures to directly cut or remove obstacles. Acoustic detectors and thermal imaging cameras have also been deployed. However, the situation at the site, where steel plates and rebar are tangled, is complex, and rescue operations are not progressing as quickly as hoped.
Deliberations on Dismantling or Reinforcing
Authorities, after deliberating with structural safety experts on whether to dismantle or reinforce the remaining boiler towers, opted for dismantling. It was reported that preparation work for the explosion required for dismantling began immediately after the decision. The dismantling work is expected to proceed around next week.
Impact on Rescue Operations
A CDMHQ official projected, “Dismantling Units 4 and 6 is expected to accelerate the rescue operations.” This move is seen as a critical step forward in ensuring the safety of both rescuers and any potential survivors still trapped in the debris. The decision reflects a careful balance between the urgency of the rescue mission and the need to prevent further structural failures.