Results of analyses performed on concrete cores removed from floors and D-ring walls of the TMI-2 reactor building

McIsaac, C.V.; Davis, C.M.; Horan, J.T.; Keefer, D.G.

doi:10.2172/6426907

Cited by 3 publications

(2 citation statements)

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“…Previous studies have reported on post-accident concrete contamination at nuclear facilities such as the Chernobyl nuclear power plant (ChPP) [3], the Three Mile Island nuclear power plant (TMI) [4], and 1F [5]. Analysis of concrete with epoxy coatings at building 1F has revealed that contamination is confined solely to the epoxy surface layer but does not permeate deeper within the concrete structure [5], consistent with results for TMI.…”

Section: Introductionsupporting

confidence: 62%

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Assessment of Radioactive Cesium Contamination in Concrete Structures near Fukushima Daiichi Nuclear Power Plant

yamada,

Arai,

Maruyama

et al. 2024

Preprint

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This study investigates the contamination of concrete by radioactive cesium released by the Tokyo Electric Power Company Fukushima Daiichi Nuclear Power Plant accident using samples from various sites in the town of Okuma, Japan. Concrete contamination was effectively evaluated through surface dose rate measurements using Geiger-Müller tubes with shielding. Corresponding radioactivity concentrations were evaluated using an NaI scintillator in a low background environment. The contamination levels were considerably lower in areas shielded from rain compared with outdoor areas exposed to rain. Contamination within concrete can be primarily attributed to radioactive Cs enrichment in specific concrete aggregates and further influenced by carbonation of the cement paste. In non-carbonated sections, radioactive Cs was concentrated in aggregates near the surface, hindering the penetration of detection into the cement paste. Concrete samples subjected to rain exhibited reduced contamination over time. Thus, rain exposure, aggregate properties, and the degree of carbonation emerged as pivotal in predicting concrete contamination. Therefore, this study yields insights into on-site measurement methods, temporal contamination trends in the environment, and the distribution of contamination within concrete structures.

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Section: Introductionsupporting

confidence: 62%

“…The contamination level decreased by 90% within 5 mm of the surface. Similarly, high contamination levels were confined to depths of a few centimeters in paint cracks at TMI [4].…”

Section: Introductionmentioning

confidence: 94%