Installation of Land-Side Impermeable Wall (Frozen Soil Wall)
To reduce the volume of contaminated water, which increases when groundwater flows into reactor buildings or other contamination sources, a frozen soil wall is being built as an impermeable wall on the land side. This is in line with the policy of keeping water away from contamination sources. This underground frozen soil wall encloses the reactor buildings and turbine buildings of Unit 1 to 4. It has so far been shown to be partially effective in blocking groundwater flowing from the mountains toward the ocean.
Overview of Land-Side Impermeable Wall (Frozen Soil Wall)
Overall View of Frozen Soil Wall
Overall View of Frozen Soil Wall
Structure of Land-Side Impermeable Wall (Frozen Soil Wall)
- Total length: Approx. 1,500 m
Amount of frozen soil: Approx. 70,0002(when Units 1 to 4 are enclosed)
Land-Side Impermeable Walls
- Facilities for manufacturing refrigerant (brine: down to -30°C)
Refrigeration Plant
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Illustration of frozen soil wall
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Pipes for freezing
Process of Installing Land-Side Impermeable Wall (Frozen Soil Wall)
Phase 1
Equipment construction completed
(February 2016)
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Phase 2
Freezing started
(March 2016)
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Phase 3
Largely completed
(March 2018)
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