Development of measurement system of radioactive plume using unmanned airplane in the fiscal year 2017 (Contract research)

Sanada, Yukihisa; Nishizawa, Yukiyasu*; Ochi, Kotaro; Yuki, Yoichi*; Ishizaki, Azusa; Osada, Naoyuki*

JAEA-Research 2018-009, 48 Pages, 2019/01

JAEA-Research-2018-009.pdf:14.77MB

At the accident of nuclear facilities, a prediction of the behavior of released radioactive plume is indispensable to make a decision on a refuge plan of inhabitants. Currently, prediction system which is based on atmospheric dispersion simulation has been implemented as a tool of the atomic energy disaster prevention. However, the direct measurement method of the radioactive plume has not existed. In this study, some component technologies were developed for the establishment of direct measurement methods of radioactive plume using unmanned aerial vehicle whose technological innovation is remarkable. In addition, the spray test using mock aerosol was conducted to obtaining the deposition rate to the airplane body. The algorism of making a flight plan was developed based on a prediction model of the radioactive plume. This report summarized the outcome of the second year of the three-year plan.

Radiation monitoring using an unmanned helicopter in the evacuation zone around the Fukushima Daiichi Nuclear Power Plant

Sanada, Yukihisa; Kondo, Atsuya*; Sugita, Takeshi*; Nishizawa, Yukiyasu; Yuki, Yoichi*; Ikeda, Kazutaka*; Shoji, Yasunori*; Torii, Tatsuo

Exploration Geophysics, 45(1), p.3 - 7, 2014/11

https://doi.org/10.1071/EG13004

The Great East Japan Earthquake on March 11, 2011 generated a series of large tsunami waves that resulted serious damage to the Fukushima Daiichi Nuclear Power Plant (NPP) and a large amount of radioactive materials were discharged from the NPP to the environment. In recent years, technologies for an unmanned helicopter have been developed and applied to various fields. In expectation of the application of the unmanned helicopter to airborne radiation monitoring, we had developed a radiation monitoring system. Then, we measured the radiation level by using unmanned helicopter in soil contaminated areas by radioactive cesium emitted from the NPP to evaluate ambient dose-rate distribution around the areas. Here, we reports on the measurement technique and the result.

Applicability of airborne geophysics (DighemV) in a granite area, 1; Airborne electromagnetic survey

Hasegawa, Ken; Matsuoka, Toshiyuki; Yuki, Yoichi*

Shadan Hojin Butsuri Tansa Gakkai Dai-116-Kai (Heisei-19-Nendo Shunki) Gakujutsu Koenkai Rombunshu, p.159 - 162, 2007/05

An airborne electromagnetic survey was conducted in the region of the Toki granite. The resistivity of the Toki granite about is about 5000 m while the resistivity of the Mizunami Group and the Seto Group which overlie the Toki granite is tens of m. Due to processing limitation, this large contrast in resistivity was not included in past calculations of apparent resistivity. A new calculation method for apparent resistivity was developed, and data was reprocessed. As a result, the regions where the thickness of the Mizunami and/or the Seto Group is thin (the depth of the Toki granite is shallow) and the regions where the Toki granite is deep were clearly identified.

Remote radiation monitoring of radioactive cesium by unmanned helicopters at the soil contaminated area in Fukushima

Sanada, Yukihisa; Kondo, Atsuya; Sugita, Takeshi; Yuki, Yoichi*; Torii, Tatsuo

no journal, , 

http://www2.jpgu.org/meeting/2012/html5/PDF/S-TT03/STT03-P06.pdf

Estimation of aerosol attachment to airplane flying in plume from nuclear power plant

Osada, Naoyuki*; Ishizaki, Azusa; Nishizawa, Yukiyasu*; Yuki, Yoichi*; Sanada, Yukihisa

no journal, , 

no abstracts in English