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?...
英字タイトル:
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...
英字タイトル:
Performance Evaluation of Japanese Nuclear Power Plantbased on Open Data and Information (2)

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....
英字タイトル:
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...
英字タイトル:
Knowledge on Radiation Dose-rate for Risk Communication on Nuclear Power Plants

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. ...
英字タイトル:
Information Useful for Risk Communication on HLRW-Disposal

The sense of anxiety for safety of nuclear power plants among people in Japan has not disappeared after Fukushima Dai-ichi accident because of a typical country with frequent earthquakes. The provision of information for seismic design in nuclear power plants pr epared for easier comprehension is always required in any kind of study meetings for the social acceptance of nuclear power plants . In the present paper, the effect of the provision of information made an attempt for students in Hokkaido Universit...
英字タイトル:
Evaluation of Seismic Design by Students Made after Fukushima Dai-ichi Accident