- Mid-and-Long-Term Roadmap
- Water management
- Spent Fuel Removal
- Fuel Debris Removal
- Monitoring by Sampling
- Stabilization of Nuclear Units
Seawater Piping Trench
Since the accident, highly contaminated water has been accumulating inside the seawater piping trench; a underground tunnel originally designed to store pipes and cables, connected to the seaside of Unit 2 to Unit 4 turbine buildings. TEPCO has been trying to reduce the risks of soil/ocean contamination by removing this accumulated water and filling the inside of trench. Considering the conditions or the quality/quantity of water contained in the tunnels or vertical shafts of the trench, the contaminated water is carefully transferred to the turbine buildings. The inside of trench is also filled with materials selected considering the individual structure or length, combining several materials where needed.
Please refer to the following materials for more details since the structure of the seawater piping trench differs for each unit.
Progress of Seawater Piping Trench Measures
(as of March 2017)
Progress of Contaminated Water Removal: 100%
|Unit 2||Unit 3||Unit 4|
|0 m³||0 m³||0 m³|
|Filling amount||Approx. 4,910 m³||Approx. 5,980 m³||Approx. 780 m³|