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Journal Articles

Radio-tellurium released into the environment during the complete oxidation of fuel cladding, containment venting and reactor building failure of the Fukushima accident

Hidaka, Akihide; Kawashima, Shigeto*; Kajino, Mizuo*

Journal of Nuclear Science and Technology, 60(7), p.743 - 758, 2023/07

https://doi.org/10.1080/00223131.2022.2142311
 Times Cited Count：2 Percentile：90.12(Nuclear Science & Technology)

An accurate estimation of radionuclides released during the Fukushima accident is essential. Therefore, authors investigated Te release using the Unit emission-regression estimation method, in which the deposition distribution is weighted based on the hourly deposition obtained from mesoscale meteorological model calculations assuming Unit emissions. The previous study focused on confirming the applicability of this method. Subsequent examination revealed that if any part of the time when a release have occurred is missing from the estimated release period, the entire source term calculation will be distorted. Therefore, this study performed the recalculation by extending the estimation period to cover all major releases. Consequently, unspecified release events were clarified, and their correspondence to in-core events was confirmed. The $$^{rm 129m}$$Te release caused by Zr cladding complete oxidation can explain the regional dependence of the $$^{rm 129m}$$Te/$$^{137}$$Cs ratio in the soil contamination map.

Journal Articles

Estimation of the release time of radio-tellurium during the Fukushima Daiichi Nuclear Power Plant accident and its relationship to individual plant events

Takahashi, Sentaro*; Kawashima, Shigeto*; Hidaka, Akihide; Tanaka, Sota*; Takahashi, Tomoyuki*

Nuclear Technology, 205(5), p.646 - 654, 2019/05

AA2017-0503.pdf:1.22MB

https://doi.org/10.1080/00295450.2018.1521186
 Times Cited Count：4 Percentile：41.24(Nuclear Science & Technology)

Oral presentation

Prediction of core water injection timing at the time of Fukushima accident considering Tellurium release event during Zr cladding oxidation

Hidaka, Akihide; Kawashima, Shigeto*; Kajino, Mizuo*; Takahashi, Sentaro*; Takahashi, Tomoyuki*

no journal, , 

no abstracts in English

Oral presentation

$$^{rm 129m}$$Te source term prediction at the beginning of Fukushima accident calculated reversely from the soil contamination map and atmospheric dispersion calculation, and recommendations for iodine and Cs source terms

Hidaka, Akihide; Kawashima, Shigeto*; Kajino, Mizuo*; Takahashi, Sentaro*; Takahashi, Tomoyuki*

no journal, , 

no abstracts in English

4 (Records 1-4 displayed on this page)
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