Evaluation of the Submerged Demineralizer System (SDS) flowsheet for decontamination of high-activity-level water at the Three Mile Island Unit 2 Nuclear Power Station

Campbell, D.O.; Collins, E.D.; King, L.J.; Knauer, J.B.

doi:10.2172/7187209

Cited by 2 publications

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“…Email: m-kondo@criepi.denken.or.jp all of the water in the vessels. Since the Cs in the zeolite works as the strong gamma radiation source, hydrogen gas was expected to be generated in the vessel by water radiolysis according to the similar water treatment system in Three Mile Island unit 2 nuclear power plant [5,6]. If hydrogen concentration exceeded 4%, there was a risk of explosion damaging the vessel structure, as the pipe rupture event reported from the nuclear power station [7].…”

Section: Introductionmentioning

confidence: 99%

Early construction and operation of the highly contaminated water treatment system in Fukushima Daiichi Nuclear Power Station (IV) - Assessment of hydrogen behavior in stored Cs adsorption vessel

Kondo

Arai

Nishi

et al. 2014

Journal of Nuclear Science and Technology

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Hydrogen diffusion behavior in a cesium adsorption vessel is assessed. The vessel is used to remove radioactive substance from contaminated water, which is proceeded from Fukushima accident. Experiment and numerical calculation are conducted to clarify the characteristics of natural circulation in the vessel. The natural circulation arising from the temperature difference between inside and outside the vessel is confirmed. We develop an evaluation model to predict the natural circulation and its prediction agrees well with the results obtained by the experiment and the calculation. Using the model, we predict steady and transient behavior of hydrogen concentration. Results indicate that hydrogen concentration is kept lower than the flammability limit when the short vent pipe is open.

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Section: Introductionmentioning

confidence: 99%

Early construction and operation of the highly contaminated water treatment system in Fukushima Daiichi Nuclear Power Station (IV) - Assessment of hydrogen behavior in stored Cs adsorption vessel

Kondo

Arai

Nishi

et al. 2014

Journal of Nuclear Science and Technology

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Adsorption Properties of Rice Hull Charcoal for Cesium and Strontium in Aqueous Solution

Kobayashi

Noda

Shibata

et al. 2018

J. Soc. Mat. Sci., Japan

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The adsorption capacity of cesium and strontium in the aqueous solution of rice hull charcoal was examined. Rice husk which was carbonized at various temperatures was added to each of cesium aqueous solution and strontium aqueous solution and stirred. As a result, rice hull charcoal carbonized at 400°C adsorbed the cesium. Rice hull charcoal carbonized at 800°C adsorbed the strontium. From this result, it was considered that the adsorption mechanism of rice hull charcoal cesium and strontium are different. From the analysis results by FTIR and Boehm method, charcoal carbonized at 400°C had acidic functional group. There was a tendency that the pH of the rice hull charcoal carbonized at high temperature became higher. It is considered to be due to precipitation of inorganic substances such as potassium on the surface of rice hull charcoal. As a result of pore distribution measurement, it was found that many mesopores were formed in rice hull charcoal carbonized at 800°C. It is assumed that cesium adsorbs primarily on acidic functional groups on the surface of rice hull charcoal, strontium undergoes ion exchange with potassium, or adsorbs to mesopores.

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Evaluation of the Submerged Demineralizer System (SDS) flowsheet for decontamination of high-activity-level water at the Three Mile Island Unit 2 Nuclear Power Station

Cited by 2 publications

References 0 publications

Early construction and operation of the highly contaminated water treatment system in Fukushima Daiichi Nuclear Power Station (IV) - Assessment of hydrogen behavior in stored Cs adsorption vessel

Early construction and operation of the highly contaminated water treatment system in Fukushima Daiichi Nuclear Power Station (IV) - Assessment of hydrogen behavior in stored Cs adsorption vessel

Adsorption Properties of Rice Hull Charcoal for Cesium and Strontium in Aqueous Solution

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