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Journal Articles

Experimental study on transport behavior of cesium iodide in the reactor coolant system under LWR severe accident conditions

Miyahara, Naoya; Miwa, Shuhei; Gou$"e$llo, M.*; Imoto, Jumpei; Horiguchi, Naoki; Sato, Isamu*; Osaka, Masahiko

Journal of Nuclear Science and Technology, 57(12), p.1287 - 1296, 2020/12

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

In order to clarify the cesium iodide (CsI) transport behavior with a focus on the mechanisms of gaseous iodine formation in the reactor coolant system of LWR under a severe accident condition, a reproductive experiment of CsI transport behavior was conducted using a facility equipped with a thermal gradient tube. Various analyses on deposits and airborne materials during transportation could elucidate two mechanisms for the gaseous iodine formation. One was the gaseous phase chemical reaction in Cs-I-O-H system at relatively high-temperature region, which led to gaseous iodine transport to the lower temperature region without any further changes in gas species due to the kinetics limitation effects. The other one was the chemical reactions related to condensed phase of CsI, namely those of CsI deposits on walls with surface of stainless steel to form Cs$$_{2}$$CrO$$_{4}$$ compound and CsI aerosol particles with steam, which were newly found in this study.

Journal Articles

Hard X-ray photoelectron spectroscopy study for transport behavior of CsI in heating test simulating a BWR severe accident condition; Chemical effects of boron vapors

Okane, Tetsuo; Kobata, Masaaki; Sato, Isamu*; Kobayashi, Keisuke*; Osaka, Masahiko; Yamagami, Hiroshi

Nuclear Engineering and Design, 297, p.251 - 256, 2016/02

 Times Cited Count:1 Percentile:84.04(Nuclear Science & Technology)

Oral presentation

Overview of evaluation of distribution and transport behavior of radionuclides in the environment of Fukushima

Iijima, Kazuki; Kitamura, Akihiro; Miyahara, Kaname

no journal, , 

The Fukushima Daiichi Nuclear Power Station (FDNPS) Accident caused release of various radionuclides into the environment. About 70% of radioactive cesium deposited on forests in Fukushima prefecture far from living sphere so that they are not planned to be specifically decontaminated, meaning that radioactive cesium will remain in the forests in future. Japan Atomic Energy Agency (JAEA) has carried out the F-TRACE project in which the transport behavior of radioactive cesium from forests to the ocean via river systems in Fukushima Prefecture was investigated. In this study, understandings of transport behavior of radioactive cesium in the environment obtained in field activities and simulation were overviewed.

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