Nuclear Power Information
Measures against Potential Tsunami
Countermeasures against Tsunami and Flooding
The Kansai Electric Power is making utmost efforts to enhance the safety and reliability of its nuclear power stations against tsunami by installing tide embankments and protective walls, in order to prevent the recurrence of a severe accident like that at Fukushima Daiichi, which was caused by a massive tsunami.
Breakwater, Tide Embankment and Protective Gates to Mitigate
Tsunami Impact and Prevent Tsunami Flooding of the Site
We have installed a breakwater and tide embankment to protect against tsunami. The offshore breakwater would mitigate the impact of a tsunami, while the tide embankment and protective gates are designed to prevent a tsunami from flooding the site.
- 1. Installation of Tide Embankment at Mihama Power Station
- We installed a 11.5m high (above sea level) and approx. 100m long tide embankment outside Wakasa Bay, which could be directly reached by a tsunami. In addition, in order to protect against flooding due to tsunami flowing into the inland sea, we are installing a 6m high (above sea level; approx. 2.5m actual height) and 1.4km long tide embankment in Nyu Bay.
- 2. Increasing the Height of the Breakwater at Ohi Power Station
- We increased the height of the existing 5m high breakwater to 8m above sea level by placing concrete, installing wave dissipating blocks, and performing reinforcing work.
- 3. Installation of Protective Gates at Takahama Power Station
- We installed a 8.5m high protective gate on the side of the water intake channel. This gate can be remotely closed in the event of a tsunami to prevent it from reaching and flooding the area. We also installed a 8m high tide embankment on the side of water discharge.
Protective Walls which Protect the Site and Plant Facilities
In preparation for an unexpectedly large tsunami that exceeds the height of the tide embankment and other measures, protective walls are installed to prevent the tsunami from flooding into the water intake structure.