scholarly journals Uncertainty in Aerosol Rainout Processes through the Case of the Radioactive Materials Emitted by the Fukushima Dai-ichi Nuclear Power Plant in March 2011

Author(s):  
Daisuke GOTO ◽  
Junya UCHIDA
2021 ◽  
pp. 169-169
Author(s):  
Sin-ya HOHARA ◽  
Masayo INAGAKI ◽  
Kiyoshi KOJIMA ◽  
Hirokuni YAMANISHI ◽  
Genichiro WAKABAYASHI ◽  
...  

2021 ◽  
Vol 21 (1) ◽  
pp. 57-70
Author(s):  
Su-Bin Oh ◽  
Chun-Ji Kim ◽  
Sang-Hyun Lee ◽  
Hyun-Ha Lee ◽  
Chun-Sil Jin ◽  
...  

To establish a strategy for public protective action from radioactive leakage in the event of Nuclear Power Plant (NPP) accidents, long-term records of wind data collected at the Korean NPPs were analyzed. Wind characteristics related to the advection and diffusion of radioactive pollutants were examined by analyzing the wind direction, speed, and land-sea breezes for NPPs (Hanbit, Hanul, Wolsong, Kori, and Shin-Kori) in Korea. The study also analyzed the characteristics of calm winds causing the accumulation of radioactive materials. The wind characteristics of each NPP differ depending on the seasonal and daily variabilities; thus, a detailed time-scaled airflow database is required. In addition, the findings, through continuous updates of the airflow database, will contribute to improving preparedness.


2011 ◽  
Vol 6 (4) ◽  
pp. 459-466
Author(s):  
Fuji Technology Press Editorial Office

Of all things relevant to the Great East Japan Earthquake, what drew the highest degree of attention from not only Japan but elsewhere around the world was the Fukushima Daiichi (No.1) Nuclear Power Plant’s nuclear power accidents that bears comparison with Chernobyl’s. During the subsequent four months, though this nuclear plant has not gone critical again, the leakage of radioactive materials from within the plant’s compounds continues. The possibility of another major accident happening, e.g. hydrogen explosion, breaking of containment vessel, in which radioactive materials would once again be strewed over the peripheral districts is not totally eradicated, albeit not so high. Given such a situation, the JDR Editorial staff has decided to examine the developments since the outbreak of the Great East Japan Earthquake and furnish the readers with updated information about developments leading to the outbreak of the accidents at the Fukushima Daiichi Nuclear Power Plant and on debates that have since evolved in Japan. Thus, this presentation here could be termed a summarization of articles that have been carried in Japanese newspapers and magazines. It admittedly includes such information whose authenticity was not fully confirmed. The judgments and views expressed in this article represent the common ground shared by vernacular newspapers and magazines. As was the case with the previous issue of this journal, the judgments and views that represent the majority opinion in Japan are carried in this issue without modification. (K.J., July 11, 2011)


2011 ◽  
Vol 6 (4) ◽  
Author(s):  
Tadahiro Ikemoto ◽  
Yasumoto Magara

On 11 March 2011, the Great East Japan Earthquake occurred and then the Japanese Prime Minister declared the state of nuclear emergency. The earthquake followed by tsunami and several accidents caused a nuclear power plant in Fukushima Prefecture to release radioactive materials into the environment. Ministry of Health, Labour and Welfare, Japan (MHLW) established a new review meeting to investigate subjects relating to radioactive materials in tap water such as the mechanism of influence of radioactive materials on tap water, measures to reduce the level of radioactive materials contaminated in tap water and medium- and long-term measures based on the results of monitoring. The review meeting published its interim report on 21 June 2011. The report analyzed future prospects as follows: (i) unless a large amount of radioactive materials is released again from the nuclear power plant, tap water has low probability to require measures such as intake restriction and (ii) groundwater that is not affected by surface water has low probability to be affected from radioactive materials. Based on the report, MHLW announced measures to reduce radioactive materials in tap water and also revised the future monitoring policy for more rational and effective implementation. Whilst radioactivity in tap water has not been detected or has been minute if detected since April 2011, the monitoring of tap water and announcement of results will be further continued in Japan.


Author(s):  
Massimo Di Pietro ◽  
Sergio Pistelli ◽  
Eugenio Garneri ◽  
Rosa Lo Frano ◽  
Riccardo Ciolini

In this paper a new technique to handle solid radioactive materials inside a liquid matrix is presented. The conceptual design of the device profits of the experience and know-how gained in decontamination procedures. The proposed system makes use of an ejector for the suction of a water-highly radioactive swarf mixture from the purifiers pool of the Italian E. Fermi NPP and moving it in a suitable container for the subsequent conditioning. A dedicated circuit with an ejector to demonstrate the feasibility of the method was realized. A minimum inlet flow was found to have swarf suction. No swarf packaging conditions were observed in the performed tests, demonstrating the feasibility of the method.


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