Chubu Electric Power Group Report 2021(Integrated Report)

A signicant portion of energy resources in Japan rely on overseas procurement. Therefore, a well-balanced combination of various power sources (energy mix) is necessary in order to ensure the stability of electricity we provide while also considering the environment. Nuclear power generation uses uranium, known for its stable supply, as a primary fuel. It is also an excellent power source in regard to the environment as it does not emic CO2 when generating electricity.Units 3 and 4 of the Hamaoka Nuclear Power Station are taking necessary measures to secure the approval of nuclear reactor establishment/change, in the area of earthquake and tsunami resistance, which is a prerequisite for the station’s safety measures. Once we mostly complete nalizing the standard seismic motion and design basis tsunami gures, our response will move on to a review on plant facilities. Simultaneously, based on these gures, we will undertake activities to facilitate an understanding for the safety of the Hamaoka Nuclear Power Station, including the effectiveness of our safety improvement measures.While making preparations to use the Hamaoka Nuclear Power Station as an important power source, we will explain our safety initiatives in detail to all parties concerned.Establishing the standard seismic motion taking into account Nankai Trough Megaquakes, etc. Implementing earthquake resistant construction• Standard seismic motion Ss1: 1,200 gal• Standard seismic motion Ss2: 2,000 gal• Soil improvement work, etc.Conducting research of volcanos around Hamaoka Nuclear Power Station to ensure safety against pyroclastic ow and volcanic ash• Conrm that the power station is out of reach of pyroclastic ow• Ensure safety against volcanic ash 10 cm-highIdentify the kind of a tornado that is likely to have great impact on the power station buildings, and implement countermeasures through tornado-resistant construction• Maximum wind velocity: 100 m/second• Measures related to the seawater intake pumpsEstablishing the tsunami standard taking into account Nankai Trough Megaquakes, etc. Implementing countermeasures throughtsunami-resistant construction• Tsunami standard: 21.1 m above sea level at the front of the tsunami protection wall• Installation of breakwater, etc.Implementing countermeasures including re prevention, detection and extinguishing• Using ame-resistant cables• Installing additional re-detecting equipment, etc.Implementing measures to prevent the reactor cooling functions from being lost if all AC power sources fail, which would lead to a serious meltdown of the nuclear fuel.• Ensuring the means of power supply, heat removal and water injection, etc.TsunamiFireSerious meltdown ofthe reactor coreEarthquakeVolcanoTornado• Examples of measures that Chubu Electric Power is considering in order to meet new regulatory standards (undergoing inspection)Unit 1 (March 1976)Output (MW)Unit (Commenced operations)Present statusUnit 2 (November 1978)Unit 3 (August 1987)Unit 4 (September 1993)Unit 5 (January 2005)(540 MW)(840 MW)1,100 MW1,137 MW1,380 MWDecommissioning process underwayDismantling of surrounding equipment and the decontamination of the reactor are underway one after another. (Operation discontinued on January 30, 2009)•The Nuclear Regulation Authority is currently investigating and conrming compliance with new regulatory standards.Safety improvement measures are currently being implemented.••Investigating specic recovery methods for seawater inltration eventsPreparing applications for investigation and conrmation of compliance with new regulatory standardsSafety improvement measures are currently being implemented.•••Initiatives toward Utilization of the Hamaoka Nuclear Power StationMESSAGEWith a strong determination never to repeat an accident similar to one that occurred at the Fukushima Daiichi Nuclear Power Station, we are voluntarily putting in place safety improvement measures at the Hamaoka Nuclear Power Station, and Units 3 and 4 are currently undergoing a review to conrm conformance with the new regulatory standards. We are also setting up a disaster prevention system and enhancing education and training programs internally while further strengthening the cooperation with national and local governments for constant improvement of our emergency responses including the evacuation of residents. Chubu Electric Power believes that in order for us to secure stable energy supply into the future while responding to the issue of global warming, it is essential to continue using nuclear power generation, which does not emit CO2 when generating electricity, as an important power source, on the premise that we can ensure its safety. We will make our utmost effort to receive early conrmation on our compliance with the new regulatory standards and commit ourselves to gain an even greater understanding and trust from members of local communities and society.* CNO Chief Nuclear OfcerSource: Central Research Institute of Electric Power Industry, “Comprehensive evaluation of lifecycle CO2 emissions for power generation technologies in Japan” (July 2016)Director & Senior Managing Executive Ofcer, General Manager of Nuclear Power Division and General Manager of Nuclear Power Department, CNOIhara IchiroPower generation method known for its stable supply superior environmental qualitiesOur response to the review to verify our compliance with the new regulatory standards(g-CO2/kWh)Fuel combustion for power generationFacilities and operationsResidentialsolar38Geothermalpower13Small- tomedium-scalehydro power110Nuclearpower19Coalthermalpower94379864Oilthermalpower73843695LNG (CC)47498376CO2emissionsduring powergeneration• Lifecycle CO2 emission amount for various power sources• Present status of reactors at the Hamaoka Nuclear Power Station (As of July 1, 2021)37Chubu Electric Power Group Report 2021Top CommitmentValue CreationStrategyBusiness ActivitiesGovernanceHuman ResourcesFinancial / Corporate DataClimate Change

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