The 2011 off the Pacific coast of Tohoku Pacific Earthquake and the Tsunami gave the serious damage to the Fukushima-Daiichi Nuclear Power Plants (NPPs). The accidents occurred in Unit 1, 2, 3 and 4. It is said that the height of tsunami attacked Fukushima NPP was more than 14m. After 50 minutes from the automatic shut-down, tsunami a ttacked the NPPs in Fukushima Daiichi NPPs. For example, the Unit 1 lost A/C power caused the loss of water injection function; it made the core meltdown and unusual increase...
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Lessons Learned from the TMI-2 Accident and Chernobyl Nuclear Disaster for Nuclear SafetyInnovation

The risk of climate change has been increasing because of the increase of CO2 emission from fossil fuel burning. We are therefore required the utilization of safety-enhanced NPPs, which is also the strategy of energy security in Japan. However, the Japanese people have concern about the disposal of long-lived radioactive waste produced in this strategy. The prototype reactor Monju is now recognized as the international research center for reduction of long-live radioactive waste. This presentation based o...
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Information for Risk Communication on Prototype Reactor Monju Based on the Lessons Learned from Accidents and Maintenance in Phenix

When a heat transfer tube wall in a steam generator of a sodium-cooled fast reactor fails, high-pressure steam leaks into low-pressure liquid sodium side. Then the high-temperature and highly corrosive reaction jet causes secondary failures of neighboring heat transfer tubes. The objective of the present study is to develop an experimental method to obtain data that is necessary to validate and improve a safety evaluation code on the sodium?water reaction. In the present paper, the methods of sodium?...
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Development of Erosion Test Methods on Underexpanded Inert-Gas Impinging Jets Injected in Liquid Sodium

The operation term of the Japanese nuclear power plants (NPPs) is shorter than other countries. Moreover, the outage period is longer. Excessive maintenances may result in early “infant mortality” failures (early failures). However, the statistical evaluation about failure type of t he Japanese NPPs was not found. Therefore, evaluation of plant engineering performance was tried on open data/information with a statistical method. The Weibull analysis, which needs not only failure data but also maintenance d...
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Performance Evaluation of Japanese Nuclear Power Plantbased on Open Data and Information (2)

After Fukushima daiichi nuclear accident, it becomes more important risk communication with the public. In discussions with the public in nuclear safety, communication and discussions on risks that not only nuclear risks also social risks are important. Differences in viewpoints, understanding, and thought about risks become communication difficult. We need to discuss risks fairly, appropriately with the public and reduce total social risks. ...
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For Discussions with the Public for the Safety of Nuclear Power -Discussion with the Public -

As one of top countries in per capita GDP, Switzerland has been keeping up a society with high resilience for historical events since 1815 after Napoleonic wars. In this presentation, the resilient history in the permanent neutral country is briefly described and then the resilient use of nuclear energy is also described as a country of less CO2 emission in advanced countries. The atomic energy basic law in Japan clearly declares the democratic, self-motivating and public opening principles for use of nuc...
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For Discussions with the Public for the Safety of Nuclear Power - For Making a Resilient Society with Sustainability-

The general public doesn't have fundamental knowledge of radiation and nuclear energy. Therefore, it is not easy to judge nuclear power plants as safe systems. This study is a survey about junior high school, university, and women's junior college students. The results show that junior high school students aren't reluctant to understand radiation....
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Necessity of Fundamental Education on Public Understanding about Nuclear Safety

The sense of anxiety on radiation after Fukushima Dai-ichi accident has not disappeared because of the nightmare scenario on radiation cultivated through the Cold War era starting at the atomic bomb dropping at Hiroshima and Nagasaki. In the present paper, from the viewpoint of establishing the social acceptance of nuclear power plants as well as new reasonable regulation, biological defense in depth (production of anti-oxidants, DNA repair, cell death/apoptosis, and immune defense mechanisms) found in...
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Knowledge on Radiation Dose-rate for Risk Communication on Nuclear Power Plants

Energy demand and CO2 emission from fossil fuels in the global society has been increasing because of the economic growth of newly developing countries like China and India. Although shale gas has a pot ential to largely change the energy supply in the United States with some good aspects, its benefits or Japan, which has only a supply system in LNG, is considered to be limited. We are therefore requ ired to continue the utilization of safety-enhanced NPPs for national security of energy with the eff ort f...
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Related Information for Communication on High-Level Radioactive Waste Disposal

The risk of climate change has been increasing because of the increase of CO2 emission from fossil fuel burning for world-wide energy demand. We are therefore required the utilization of safety-enhanced NPPs, which includes the strategy of energy security and the realization of disposal site for high-level-radioactive waste. This presentation related to public acceptance for the disposal site shows some characteristics and facts of active fault and earthquake motion useful for the risk communication. ...
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Information Useful for Risk Communication on HLRW-Disposal