Establishing Preparedness in Case of Severe Accidents
Preventing Damage to the Containment Vessel / Controlling the Dispersion of Radioactive Materials
Preventing Damage to the Containment Vessel
Measures include installing the facility for cooling the connection with the containment vessel at the top lid, reinforcing the facility for cooling steam inside the containment vessel, and installing the facility for cooling heated fuel that has melted and dropped to the bottom of the containment vessel.
Reactor well water injection system
Alternative spray system for containment vessel
Water injection system for bottom of containment vessel
Controlling the Dispersion of Radioactive Materials
The power station is installing filter vents. When releasing gas into the outside atmosphere to depressurize the containment vessel, the exhaust is fed through a filter that absorbs radioactive materials. This cuts the amount of cesium and other radioactive particles discharged to below one-1000th, thereby preventing large-scale soil contamination and long-term evacuation of local residents.
The power station is also installing hydrogen concentration meters and introducing ways of releasing hydrogen from the buildings in order to prevent a hydrogen explosion at the reactor buildings. Water cannons are also deployed to spray water onto the buildings while hydrogen is released, so as to catch and bring airborne radioactive materials onto the ground.