Examination of ¹³¹I and ¹³⁷Cs releases during late phase of Fukushima Daiichi NPP accident by using ¹³¹I/¹³⁷Cs ratio of source terms evaluated reversely by WSPEEDI code with environmental monitoring data

Abstract

To investigate what happened in reality during the Fukushima Daiichi Nuclear Power Plant accident, the phenomena within reactor pressure vessel and the discussion of ties with the environmental monitoring measurement are very important. However, the previous study that treats phenomena of the both has not necessarily advanced up to the present time. The source terms predicted by simulation codes such as MELCOR has not yet been consistent with the reverse estimation by WSPEEDI code using environmental measurement data. The present study investigated 131 I and 137 Cs release behaviors during the late phase of the accident to contribute to such examination using the 131 I/ 137 Cs ratio of the new source terms predicted by Katata. The 131 I release by the gas-liquid partition from the contaminated water in the 1F2 and 1F3 reactor buildings which was pointed out in the previous study was reevaluated using the new source terms. In addition, paying attention to the similarity of the core conditions between the

Effects of Zeolitic Parameters and Irradiation on the Retention Properties of Silver Zeolites Exposed to Molecular Iodine

“…1,2 Among the different FPs, the capture of radiological iodine is of specific interest due to the high impact of the 131 I and 129 I isotopes at short and long terms, respectively, and the ability of this element to exist in volatile forms. 3 In the event of a core melt accident, the reactor containment might suffer damage resulting from overpressure caused by the steam inlet from the core and possible molten core concrete interactions inside the containment over a long period. If the containment integrity is not maintained, significant off-site radiotoxic emissions could be released.…”

“…Since the Fukushima disaster in 2011, there has been a renewed interest for the mitigation of fission products (FPs) releases in the case of severe nuclear accident at short and middle terms. , Among the different FPs, the capture of radiological iodine is of specific interest due to the high impact of the 131 I and 129 I isotopes at short and long terms, respectively, and the ability of this element to exist in volatile forms . In the event of a core melt accident, the reactor containment might suffer damage resulting from overpressure caused by the steam inlet from the core and possible molten core concrete interactions inside the containment over a long period.…”

Summary report of recent activities for decontamination and environmental restoration after Fukushima Daiichi nuclear power plant accident

“…Summary report of recent activities for decontamination and environmental restoration after Fukushima Daiichi nuclear power plant accident After Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, many researchers have estimated the release of radionuclides from the plants to atmosphere [1][2][3]. The released radionuclides were deposited on the ground of the nearby area [4], and the neighboring prefectures [5] and even in ocean [6].…”

Cu(ii) and Zn(ii) frameworks constructed by directional tuning of diverse substituted groups on a triazine skeleton and supermassive adsorption behavior for iodine and dyes

“…The radioactive iodine in waste gas from nuclear power plants pollutes water resources and crops and then damages human health. [1][2][3][4][5] Meanwhile, with the improvement of human living standards, the wide supply of food, textiles, paper, plastics, cosmetics, pharmaceuticals, and other industries has led to massive organic dyes in wastewater. 6 Due to iodine and organic dyes dissolving in water and causing harm to the ecological environments and human health, it is necessary and urgently required to invent methods to remove iodine and organic dyes.…”