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Safety First Policy



We Will Enhance Safety Measures to Further Increase the Safety Level of Our Power Stations.

In order to ensure safety based on the most advanced knowledge available, we are developing safety measures in accordance with the New Guidelines for Seismic Safety and the lessons learned from the Great East Japan Earthquake.

Protective walls installed to protect the outdoor ventilation system for the emergency diesel power generators from tsunami waves (Tokai No. 2 Power Station)

Protective walls installed to protect the outdoor ventilation system for the emergency diesel power generators from tsunami waves (Tokai No. 2 Power Station)


Compliance with the New Guidelines for Seismic Safety


In September 2006, the Guidelines for the Seismic Safety of Power Generation Nuclear Reactor Facilities were revised by the Nuclear Energy Safety Commission of Japan (New Guidelines for Seismic Safety). JAPC performs seismic safety assessments of existing power stations based on these New Guidelines for Seismic Safety along with assessments that reflect the lessons learned from the Niigata Chuetsu Oki Earthquake and submits reports (revised versions of interim reports) to the Japanese government.
With a view to further improving the safety margin of power station facilities, we are undertaking construction work to improve seismic resistance, such as reinforcement of the piping supports and other support structures, ground improvements, and tsunami countermeasures.

Piping fitted with supports to improve seismic resistance (Tsuruga Power Station Unit 1)

Piping fitted with supports to improve seismic resistance (Tsuruga Power Station Unit 1)

Seawater cooling system discharge piping installed above the ground instead of underground to prevent damage from liquefaction caused by earthquakes (Tokai No. 2 Power Station)

Seawater cooling system discharge piping installed above the ground instead of underground to prevent damage from liquefaction caused by earthquakes (Tokai No. 2 Power Station)

Large-scale construction work on a slope near a nuclear reactor building to prevent damage from landslides (Tsuruga Power Station Unit 1)

Large-scale construction work on a slope near a nuclear reactor building to prevent damage from landslides (Tsuruga Power Station Unit 1)

 

Enhancement of Safety Measures for Earthquakes and Tsunami

The nuclear reactors at the Tokyo Electric Power Company's Fukushima Daiichi Nuclear Power Station automatically shut down operation in response to the Great East Japan Earthquake. However, the external power supply was disconnected by a power line failure, and the emergency diesel power generators, which had automatically started, were knocked out of operation by the tsunami waves. Consequently, the power station lost its ability to cool the nuclear reactors, resulting in a serious accident in which radioactive substances were released into the atmosphere.
To prevent accidents such as these, JAPC takes all possible measures to protect those important facilities which ensure safety from becoming inundated by large tsunami waves and also by ensuring a power supply sufficient to cool the nuclear reactors is secured even if all power sources are not available. We are also prepared to inject cooling water into nuclear reactors that have lost their power sources.


   

Systems for Ensuring Safety

The foundation of nuclear power station safety is defense in depth, which by use of a variety of mechanisms ensures the safety of the surrounding area in the event of an accident.
In order to maintain and improve the level of safety, we also perform strict quality control as well as conduct careful checks and inspections. In addition, we provide training to improve the technical proficiency of the operators and maintenance workers who support safety operations.
In the recent nuclear accident which was triggered by the Great East Japan Earthquake, the nuclear reactors and other facilities were not able to be efficiently cooled, which resulted in radioactive substances being released into the surrounding environment. For this reason, JAPC is enhancing its safety measures, focusing particularly on those functions related to cooling nuclear reactors.