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Warashina T, Sato A, Hinai H, Shaikhutdinov N, Shagimardanova E, Mori H, Tamaki S, Saito M, Sanada Y, Sasaki Y, Shimada K, Dotsuta Y, Kitagaki T, Maruyama S, Gusev O, Narumi I, Kurokawa K, Morita T, Ebisuzaki T, Nishimura A, Koma Y, Kanai A. Microbiome analysis of the restricted bacteria in radioactive element-containing water at the Fukushima Daiichi Nuclear Power Station. Appl Environ Microbiol 2024; 90:e0211323. [PMID: 38470121 PMCID: PMC11022576 DOI: 10.1128/aem.02113-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 02/21/2024] [Indexed: 03/13/2024] Open
Abstract
A major incident occurred at the Fukushima Daiichi Nuclear Power Station following the tsunami triggered by the Tohoku-Pacific Ocean Earthquake in March 2011, whereby seawater entered the torus room in the basement of the reactor building. Here, we identify and analyze the bacterial communities in the torus room water and several environmental samples. Samples of the torus room water (1 × 109 Bq137Cs/L) were collected by the Tokyo Electric Power Company Holdings from two sampling points between 30 cm and 1 m from the bottom of the room (TW1) and the bottom layer (TW2). A structural analysis of the bacterial communities based on 16S rRNA amplicon sequencing revealed that the predominant bacterial genera in TW1 and TW2 were similar. TW1 primarily contained the genus Limnobacter, a thiosulfate-oxidizing bacterium. γ-Irradiation tests on Limnobacter thiooxidans, the most closely related phylogenetically found in TW1, indicated that its radiation resistance was similar to ordinary bacteria. TW2 predominantly contained the genus Brevirhabdus, a manganese-oxidizing bacterium. Although bacterial diversity in the torus room water was lower than seawater near Fukushima, ~70% of identified genera were associated with metal corrosion. Latent environment allocation-an analytical technique that estimates habitat distributions and co-detection analyses-revealed that the microbial communities in the torus room water originated from a distinct blend of natural marine microbial and artificial bacterial communities typical of biofilms, sludge, and wastewater. Understanding the specific bacteria linked to metal corrosion in damaged plants is important for advancing decommissioning efforts. IMPORTANCE In the context of nuclear power station decommissioning, the proliferation of microorganisms within the reactor and piping systems constitutes a formidable challenge. Therefore, the identification of microbial communities in such environments is of paramount importance. In the aftermath of the Fukushima Daiichi Nuclear Power Station accident, microbial community analysis was conducted on environmental samples collected mainly outside the site. However, analyses using samples from on-site areas, including adjacent soil and seawater, were not performed. This study represents the first comprehensive analysis of microbial communities, utilizing meta 16S amplicon sequencing, with a focus on environmental samples collected from the radioactive element-containing water in the torus room, including the surrounding environments. Some of the identified microbial genera are shared with those previously identified in spent nuclear fuel pools in countries such as France and Brazil. Moreover, our discussion in this paper elucidates the correlation of many of these bacteria with metal corrosion.
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Affiliation(s)
- Tomoro Warashina
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan
- Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, Japan
| | - Asako Sato
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan
| | | | - Nurislam Shaikhutdinov
- Regulatory Genomics Research Center, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Kazan, Russia
| | - Elena Shagimardanova
- Regulatory Genomics Research Center, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Kazan, Russia
- Life Improvement by Future Technologies (LIFT) Center, Skolkovo, Moscow, Russia
- Loginov Moscow Clinical Scientific Center, Moscow, Russia
| | | | - Satoshi Tamaki
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan
| | - Motofumi Saito
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan
- Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, Japan
| | | | | | | | | | | | - Shigenori Maruyama
- Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, Japan
| | - Oleg Gusev
- Regulatory Genomics Research Center, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Kazan, Russia
- Life Improvement by Future Technologies (LIFT) Center, Skolkovo, Moscow, Russia
- Intractable Disease Research Center, School of Medicine, Juntendo University, Tokyo, Japan
| | - Issay Narumi
- Faculty of Life Sciences, Toyo University, Oura-gun, Japan
| | | | - Teppei Morita
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan
- Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, Japan
| | | | | | | | - Akio Kanai
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan
- Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, Japan
- Faculty of Environment and Information Studies, Keio University, Fujisawa, Japan
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Yomogida T, Ouchi K, Oka T, Kitatsuji Y, Koma Y, Konno K. Analysis of particles containing alpha-emitters in stagnant water at torus room of Fukushima Dai-ichi Nuclear Power Station’s Unit 2 reactor. Sci Rep 2022; 12:7191. [PMID: 35577810 PMCID: PMC9110416 DOI: 10.1038/s41598-022-11334-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 04/20/2022] [Indexed: 11/09/2022] Open
Abstract
AbstractParticles containing alpha (α) nuclides were identified from sediment in stagnant water in the torus room of the Fukushima Dai-ichi Nuclear Power Station(FDiNPS)’s Unit 2 reactor. We analyzed uranium (U), which is the main component of nuclear fuel, using scanning electron microscopy (SEM). Other α-nuclides (plutonium [Pu], americium [Am], and curium [Cm]) were detected by alpha track detection and the morphology of particles with α-nuclides were analyzed by SEM-energy dispersive X-Ray (EDX) analysis. Several uranium-bearing particles ranging from sub-µm to several µm in size were identified by SEM observation. These particles contained zirconium (Zr) and other elements which constituted fuel cladding and structural materials. The 235U/238U isotope ratio in the solid fractions that included U particles was consistent with what was found for the nuclear fuel in the Unit 2 reactor. This indicated that the U of similar fuel composition had made finer. The α-nuclide-containing particles identified by alpha track analysis were several tens to several hundred µm in size. The EDX spectra showed that these particles mainly comprised iron (Fe). Since the amount of α-nuclide material was very small, Pu, Am, and Cm were adsorbed on the Fe particles. This study clarifies that the major morphologies of U and other α-nuclides in the sediment of stagnant water in the torus room of FDiNPS’s Unit 2 reactor differed.
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Strand P, Jefferies N, Koma Y, Plyer J. Methodological developments and practice in characterisation of unconventional and legacy waste. J Radiol Prot 2022; 42:020501. [PMID: 35026748 DOI: 10.1088/1361-6498/ac4b02] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
Radioactive waste management requires planned and systematic actions to provide confidence that the entire system, processes and final products will satisfy given requirements for quality. The characterisation process is dependent on setting clear characterisation objectives and gathering the right information to underpin the decisions that need to be taken to manage the waste safely. This paper reviews experience of characterisation of waste generated from past nuclear activities that were not conducted in compliance consistent with current criteria, or from unexpected situations that were not planned for. This experience shows that the development of a reliable and efficient characterisation and categorisation methodology is a common challenge for such wastes, referred to here as unconventional and legacy (UL) waste. Through the activites of the Nuclear Energy Agency Expert Group on the Characterisation of Unconventional and Legacy Waste, consideration has been given to widely used waste stream characterisation procedures and methods that were originally developed primarily for application in conventional decommissioning work. Although they provide a substantial basis for characterisation, there are various additional factors that commonly need to be taken into account in the case of UL waste. By analysing the challenges and lessons learned from a variety of case studies and other international experience, it has been possible to identify opportunities for adaptations and enhancements to these characterisation methologies, and these are set out and explained. The need for integration of waste characterisation with other aspects of strategic planning for UL waste management is discussed, including characterisation to address any non-radiological hazards. The analysed case studies have also highlighted the importance of developing a robust legislative and regulatory framework in parallel with an appropriate waste infrastructure to treat, store and dispose of UL waste. Finally, the basic features of a UL waste characterisation roadmap are presented, including the interactions within a wider UL waste management programme and key areas for further consideration and possible development. It is anticipated such work can be supported by continued international cooperation.
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Affiliation(s)
- Per Strand
- Centre for Environmental Radioactivity at the Norwegian University of Life Sciences, Ås, Norway
| | | | | | - Jo Plyer
- Collaborative Environmental Advisers, Romsey, United Kingdom
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Pyke CK, Hiller PJ, Koma Y, Ohki K. Radioactive waste sampling for characterisation - A Bayesian upgrade. Nuclear Engineering and Technology 2022. [DOI: 10.1016/j.net.2021.07.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Grambow B, Nitta A, Shibata A, Koma Y, Utsunomiya S, Takami R, Fueda K, Ohnuki T, Jegou C, Laffolley H, Journeau C. Ten years after the NPP accident at Fukushima : review on fuel debris behavior in contact with water. J NUCL SCI TECHNOL 2021. [DOI: 10.1080/00223131.2021.1966347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Bernd Grambow
- SUBATECH (IMT Atlantique, CNRS-IN2P3, University De Nantes), Nantes, France
- Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki, Japan
| | - Ayako Nitta
- Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency(JAEA), Ibaraki, Japan
| | - Atsuhiro Shibata
- Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency(JAEA), Ibaraki, Japan
| | - Yoshikazu Koma
- Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, Ibaraki, Japan
| | | | - Ryu Takami
- Department of Chemistry, Kyushu University, Fukuoka, Japan
| | - Kazuki Fueda
- Department of Chemistry, Kyushu University, Fukuoka, Japan
| | - Toshihiko Ohnuki
- NPO Environmental Sustainable Research Laboratory, Tokyo Institute of Technology, Meguro-ku, Japan
| | - Christophe Jegou
- CEA, DES, ISEC, DE2D, University of Montpellier, Marcoule, France
| | - Hugo Laffolley
- SUBATECH (IMT Atlantique, CNRS-IN2P3, University De Nantes), Nantes, France
- CEA, DES, IRESNE, DTN, Severe Accident Experimental Laboratory, Saint-Paul-Lez-Durance, France
| | - Christophe Journeau
- CEA, DES, IRESNE, DTN, Severe Accident Experimental Laboratory, Saint-Paul-Lez-Durance, France
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Sugiyama D, Nakabayashi R, Tanaka S, Koma Y, Takahatake Y. Stochastic estimation of radionuclide composition in wastes generated at Fukushima Daiichi nuclear power station using Bayesian inference. J NUCL SCI TECHNOL 2021. [DOI: 10.1080/00223131.2021.1884137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Daisuke Sugiyama
- Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, Tokyo, Japan
| | - Ryo Nakabayashi
- Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, Tokyo, Japan
| | - Shingo Tanaka
- Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, Tokyo, Japan
| | - Yoshikazu Koma
- Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency, Ibaraki, Japan
- R&D Strategy Planning Department, International Research Institute for Nuclear Decommissioning, Tokyo, Japan
| | - Youko Takahatake
- Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency, Ibaraki, Japan
- R&D Strategy Planning Department, International Research Institute for Nuclear Decommissioning, Tokyo, Japan
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Yin X, Zhang L, Harigai M, Wang X, Ning S, Nakase M, Koma Y, Inaba Y, Takeshita K. Hydrothermal-treatment desorption of cesium from clay minerals: The roles of organic acids and implications for soil decontamination. Water Res 2020; 177:115804. [PMID: 32302807 DOI: 10.1016/j.watres.2020.115804] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 04/03/2020] [Accepted: 04/05/2020] [Indexed: 06/11/2023]
Abstract
The adsorption and desorption of cesium (Cs) on clays of contaminated soil in a rhizosphere zone can be greatly affected by various biogeochemical processes, the timespans of which are usually months to years. Herein, we present several representative scenarios of the binding of Cs on diverse sites of vermiculitized biotite by controlled Cs adsorption to particles of different sizes. We investigated whether and how the fixed Cs in the different scenarios is desorbed by ambient and hydrothermal treatments with several low-molecular-weight organic acids (LMWOAs). The results showed that the sorbed Cs was discriminatively retained in the un-collapsed, partially collapsed, and thoroughly collapsed structures of vermiculites. The desorption of the sorbed Cs by hydrothermal LMWOAs extractions was easily realized in the un-collapsed structure, but was limited or minimal in the partially collapsed and thoroughly collapsed structures. The Cs desorption varied in accord with the LMWOA species applied and increased with the acid concentration, temperature, and number of treating cycles. The analysis of Cs-desorbed specimens confirmed their partial destruction and interlayer expansion, suggesting that the underlying mechanism of Cs removal by LMWOAs involves not only acid dissolution and complexation but also the accelerated weathering of clays within a short time under hydrothermal conditions. Our findings contribute novel insights into the mobility, bioavailability, and fate of Cs in contaminated soils and its removal from these soils for environmental restorations.
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Affiliation(s)
- Xiangbiao Yin
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan; Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency, 790-1 Otsuka, Motooka, Tomioka, Fukushima, 979-1195, Japan.
| | - Lijuan Zhang
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Miki Harigai
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Xinpeng Wang
- School of Resources, Environment and Materials, Guangxi University, 100 Daxue East Road, Nanning, 530004, PR China
| | - Shunyan Ning
- School of Resources, Environment and Materials, Guangxi University, 100 Daxue East Road, Nanning, 530004, PR China
| | - Masahiko Nakase
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Yoshikazu Koma
- Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency, 790-1 Otsuka, Motooka, Tomioka, Fukushima, 979-1195, Japan
| | - Yusuke Inaba
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Kenji Takeshita
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
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Yin X, Zhang L, Meng C, Inaba Y, Wang X, Nitta A, Koma Y, Takeshita K. Selective removal of radiocesium from micaceous clay for post-accident soil decontamination by temperature-controlled Mg-leaching in a column. J Hazard Mater 2020; 387:121677. [PMID: 31784126 DOI: 10.1016/j.jhazmat.2019.121677] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 11/07/2019] [Accepted: 11/11/2019] [Indexed: 06/10/2023]
Abstract
The effective and efficient removal of radioactive Cs from contaminated soil is highly urgent for the nuclear post-accident remediation. In present study, we achieved rapid Cs desorption from both a typical micaceous clay (i.e., vermiculitized biotite, VB) and actually contaminated soil by high-speed ion exchange through temperature-controlled continuous leaching with Mg-solutions in a column reactor. Cs-sorbed VB was firstly employed as a soil surrogate to explore the macro-Cs desorption process and micro-mechanism in detail. Results showed that VB sandwiched the adsorbed Cs to its interlayers within collapsed structure (10.7 Å) and prevent Cs release even by abundant extraction with H2O at 250 °C or Mg2+ at 25 °C. However, Mg2+-extracted Cs desorption boosted significantly with elevating temperatures and 100 % of sorbed-Cs was removed from Cs-VB leached above 150 °C. Further structural and composition analysis of the leached specimen ensured that solvated Mg2+ preferentially entered into Cs+-collapsed interlayers at 150 °C than K+-interlayers above 200 °C, leading to prior complete Cs removal over K from VB at lower temperatures. By contrast, the Cs-contaminated soil reduced by ∼39 % but ∼82 % of its initial radioactivity after equally leaching with same volumes of Mg2+-solution at 150 and 200 °C, respectively. These temperature-controlled Cs desorption validated that radioactive Cs in actual soil indeed be tightly trapped by micaceous clays nearly in the Cs-K co-collapsed interlayers, to which its extraction by other cations can conditionally occur above enough high leaching temperatures. These superior features would inspire new insights for the design of novel practical technologies for treatment and decontamination of the nuclear post-accident soils.
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Affiliation(s)
- Xiangbiao Yin
- Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency, 790-1 Otsuka, Motooka, Tomioka, Fukushima 979-1195, Japan; Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
| | - Lijuan Zhang
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
| | - Chenrui Meng
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
| | - Yusuke Inaba
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
| | - Xinpeng Wang
- College of Resources and Metallurgy, Guangxi University, 100 Daxue East Road, Nanning 530004, PR China.
| | - Ayako Nitta
- Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency, 790-1 Otsuka, Motooka, Tomioka, Fukushima 979-1195, Japan.
| | - Yoshikazu Koma
- Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency, 790-1 Otsuka, Motooka, Tomioka, Fukushima 979-1195, Japan.
| | - Kenji Takeshita
- Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
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Sugiyama D, Nakabayashi R, Koma Y, Takahatake Y, Tsukamoto M. Development of calculation methodology for estimation of radionuclide composition in wastes generated at Fukushima Daiichi nuclear power station. J NUCL SCI TECHNOL 2019. [DOI: 10.1080/00223131.2019.1595765] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Daisuke Sugiyama
- Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, Tokyo, Japan
| | - Ryo Nakabayashi
- Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, Tokyo, Japan
| | - Yoshikazu Koma
- Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency/International Research Institute for Nuclear Decommissioning, Ibaraki, Japan
| | - Youko Takahatake
- Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency/International Research Institute for Nuclear Decommissioning, Ibaraki, Japan
| | - Masaki Tsukamoto
- Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, Tokyo, Japan
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Abstract
Abstract
The Fukushima Daiichi Nuclear Power Station, which is owned by the Tokyo Electric Power Company, was damaged by the great earthquake and tsunami on March 11, 2011, and serious contamination due to radioactive nuclides occurred. To investigate the waste management methodologies, contaminated materials were radiochemically analyzed. This paper reviews the analytical data concerning actinide elements. Contaminated water has accumulated in the basement of the reactor and other buildings, and actinide nuclides have been detected in this water. Actinides first get dissolved into the water inside the primary containment vessel, and then their concentration in the water decreases to a certain level with further flow. The contaminated water is chemically decontaminated; however, the actinide concentration does not decrease with time. This suggests that the actinides are continuously being supplied by the damaged fuel via slow dissolution. The dissolved transuranic (TRU) nuclides are recovered in the precipitate via a chemical treatment and are mostly removed from the water. Pu, Am, and Cm were detected in the topsoil at the site and appear to originate from the damaged fuel, whereas the detected U originates from natural sources. TRU nuclides slowly move in soil to deeper layers. The contamination of the rubble is nonuniform, and actinides are detected as well as fission products. Inside the reactor building of unit #2, the TRU nuclide concentration is comparatively higher near the boundary of the primary containment vessel, which experienced a fault during the accident. As for the vegetation, TRU nuclides were only found in fallen leaves near the reactor buildings.
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Affiliation(s)
- Yoshikazu Koma
- Japan Atomic Energy Agency , Muramatsu 4-33 , Tokai-mura, Ibaraki-ken 319-1194 , Japan
| | - Erina Murakami
- Japan Atomic Energy Agency , Muramatsu 4-33 , Tokai-mura, Ibaraki-ken 319-1194 , Japan
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Nambu K, Koma Y, Sakata H, Kyuma H, Sugimoto K, Fujimoto T. Clinical study of 31 cases of dental implants with maxillary sinus floor augmentation. Int J Oral Maxillofac Surg 2019. [DOI: 10.1016/j.ijom.2019.03.639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Koma Y, Shibata A, Ashida T. Radioactive contamination of several materials following the Fukushima Daiichi Nuclear Power Station accident. Nuclear Materials and Energy 2017. [DOI: 10.1016/j.nme.2016.08.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Zhang A, Wei Y, Hoshi H, Kumagai M, Koma Y. Leakage of Octyl(Phenyl)-N,N-Di-Isobutylcarbamoylmethylphosphine Oxide from a Macroporous Silica-Based Chelating Polymeric Adsorption Material and its Recovery by Some Selected Porous Adsorbents. ADSORPT SCI TECHNOL 2016. [DOI: 10.1260/026361705776316532] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
The leakage behaviour of a neutral chelating agent, i.e. octyl(phenyl)- N,N-di-isobutylcarbamoylmethylphosphine oxide (CMPO), from its macroporous silica-based (CMPO/SiO2-P) extraction resin (a novel polymeric adsorption material developed in the MAREC process) and the recovery of CMPO by some selected polymer- and silica-based porous adsorbents were investigated by column operation in 0.01 M HNO3at 25°C or 50°C. The concentration of CMPO in the effluent leaking from CMPO/SiO2-P was determined as ca. 48 ppm at 25°C and ca. 37 ppm at 50°C. The corresponding elution volumes and the amounts of CMPO leaking were 8700.9 BV/g and 239.3 mg/g at 25°C and 11 842.9 BV/g and 359.4 mg/g at 50°C, respectively. The adsorption experiment showed that a polymer-based porous material, SEPABEADS® SP-825, was capable of recovering CMPO effectively from 0.01 M HNO3. Its adsorption ability towards CMPO was considerably greater than those of macroporous silica-based SiO2-P particles, polymer-based Amberlite™ XAD-7 and activated carbon. The bed volume and the amount of CMPO adsorbed by SEPABEADS® SP-825 at the breakthrough point at 25°C were 13 549.2 BV/g and 498.7 mg/g, respectively, thereby demonstrating that SEPABEADS® SP-825 was promising for the recovery of CMPO from Am(III)- and Cm(III)-containing solutions in the MAREC process.
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Affiliation(s)
- Anyun Zhang
- Nuclear Chemistry and Chemical Engineering Center, Institute of Research and Innovation, 1201 Takada, Kashiwa, Chiba-ken, Japan 277-0861
| | - Yuezhou Wei
- Nuclear Chemistry and Chemical Engineering Center, Institute of Research and Innovation, 1201 Takada, Kashiwa, Chiba-ken, Japan 277-0861
| | - Harutaka Hoshi
- Nuclear Chemistry and Chemical Engineering Center, Institute of Research and Innovation, 1201 Takada, Kashiwa, Chiba-ken, Japan 277-0861
| | - Mikio Kumagai
- Nuclear Chemistry and Chemical Engineering Center, Institute of Research and Innovation, 1201 Takada, Kashiwa, Chiba-ken, Japan 277-0861
| | - Yoshikazu Koma
- Japan Nuclear Cycle Development Institute, Tokai-mura, Naka-gun, Ibaraki-ken, Japan 319-1194
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Shibata A, Koma Y, Ohi T. Estimation of the inventory of the radioactive wastes in Fukushima Daiichi NPS with a radionuclide transport model in the contaminated water. J NUCL SCI TECHNOL 2016. [DOI: 10.1080/00223131.2016.1196625] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Atsuhiro Shibata
- Department of Fukushima Technology Development, Nuclear Backend Technology Center, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, Japan
| | - Yoshikazu Koma
- Waste Management Division, Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, Japan
| | - Takao Ohi
- Waste Management Division, Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, Japan
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Watanabe S, Sano Y, Nomura K, Koma Y, Okamoto Y. Safety operation of chromatography column system with discharging hydrogen radiolytically generated. EPJ Nuclear Sci Technol 2015. [DOI: 10.1051/epjn/e2015-50006-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Fujimoto T, Nishino S, Shinmura C, Koma Y, Sugiyama M, Uejima S. Clinical study of the modified Caldwell-Luc operation by using 3-D image analysis. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Shinmura C, Fujimoto T, Nishino S, Koma Y, Sugiyama M, Uejima S. Resistant florid oral papillomatosis: a case report. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Hashimoto O, Yoshida M, Koma Y, Yanai T, Hasegawa D, Kosaka Y, Nishimura N, Yokozaki H. 169 Contribution of cancer-associated fibroblasts and M2-polarized macrophages to neuroblastoma development. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30066-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Affiliation(s)
- Yoshikazu Koma
- Japan Nuclear Cycle Development Institute, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraid-ken, 319-1194, Japan
| | - Atsushi Aoshima
- Japan Nuclear Cycle Development Institute, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraid-ken, 319-1194, Japan
| | - Mamoru Kamoshida
- Hitachi Ltd., Power and Industrial Systems R&D Laboratory, 7-2-1, Ohmika-machi, Hitachi-shi, Ibaraki-ken, 319-1221, Japan
| | - Akira Sasahira
- Hitachi Ltd., Power and Industrial Systems R&D Laboratory, 7-2-1, Ohmika-machi, Hitachi-shi, Ibaraki-ken, 319-1221, Japan
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Nakahara M, Koma Y, Nakajima Y. Co-processing of uranium and plutonium for sodium-cooled fast reactor fuel reprocessing by acid split method for plutonium partitioning without reductant. J NUCL SCI TECHNOL 2013. [DOI: 10.1080/00223131.2013.831330] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Nakahara M, Koma Y. Influence of Nitric Acid and Nitrous Acid on Oxidation and Extraction of Neptunium with Double Scrub Flow Sheet in Simplified Solvent Extraction Process. J Chem Eng Japan / JCEJ 2011. [DOI: 10.1252/jcej.11we047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Masaumi Nakahara
- Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency
| | - Yoshikazu Koma
- Advanced Nuclear System Research and Development Directorate, Japan Atomic Energy Agency
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Zhang A, Wei Y, Hoshi H, Koma Y, Kamiya M. Partitioning of Cesium from a Simulated High Level Liquid Waste by Extraction Chromatography Utilizing a Macroporous Silica‐Based Supramolecular Calix[4]arene‐Crown Impregnated Polymeric Composite. Solvent Extraction and Ion Exchange 2007. [DOI: 10.1080/07366290701285322] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Zhang A, Wei Y, Kumagai M, Koma Y, Koyama T. Resistant behavior of a novel silica-based octyl(phenyl)-N,N-diisobutyl carbamoylmethylphoshine oxide neutral extraction resin against nitric acid, temperature and γ-radiation. Radiat Phys Chem Oxf Engl 1993 2005. [DOI: 10.1016/j.radphyschem.2004.01.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Koma Y, Koma M, Ilgenfritz EM, Suzuki T, Polikarpov MI. Duality of gauge field singularities and the structure of the flux tube in Abelian-projected SU(2) gauge theory and the dual Abelian Higgs model. Int J Clin Exp Med 2003. [DOI: 10.1103/physrevd.68.094018] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ito A, Watabe K, Koma Y, Kitamura Y. An attempt to isolate genes responsible for spontaneous and experimental metastasis in the mouse model. Histol Histopathol 2003; 17:951-9. [PMID: 12168807 DOI: 10.14670/hh-17.951] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cancer develops and progresses as genetic alterations occur subsequently. Onset process of cancer has become well understood in some types of cancer, such as colorectal cancers. In this process, responsible alterations were identified in numbers of oncogenes such as k-ras, and tumor suppressor genes such as p53, as Vogelstein proposed earlier in the multistage carcinogenesis theory. In contrast, our understanding remains short to draw such an adequate diagram for the process during which cancer becomes more malignant, i.e., metastatic. To examine the molecular basis for this progression step, mouse metastasis models have been established where tumor cell lines are inoculated into mice and metastasize to specific organs. The model using B16 melanoma cells is one of the most developed. BL6 subline, one of the most metastatic, was obtained from F10 subline simply through six rounds of in vitro selection. Nonetheless, BL6 cells metastasize lungs much more heavily than F10 cells when injected subcutaneously. The difference in gene expression between the two sublines is considered rather small but relevant for spontaneous metastasis. We began our research by elaborating a method for the construction of subtracted cDNA libraries, and made it applicable to BL6 and F10 cells. As a result, we were able to isolate a couple of genes that were expressed differently between the two sublines. As might be expected, each of the genes appeared to play a role more or less in distinct aspects of spontaneous metastasis of B16 melanoma cells. Moreover, similar roles were expected for the genes in the process by which human melanoma cells metastasize.
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MESH Headings
- Animals
- Biomarkers, Tumor/metabolism
- Coculture Techniques
- Connexin 26
- Connexins/metabolism
- DNA, Complementary/metabolism
- DNA-Binding Proteins/metabolism
- Disease Models, Animal
- Gene Library
- Humans
- Melanoma, Experimental/pathology
- Mice
- Models, Biological
- Neoplasm Metastasis
- Neoplasm Proteins/metabolism
- Neoplasms, Experimental
- Nuclear Proteins/metabolism
- Phosphoprotein Phosphatases/metabolism
- Protein Isoforms
- Protein Structure, Tertiary
- RNA, Messenger/metabolism
- RNA-Binding Proteins
- Ribonucleoproteins, Small Nucleolar/metabolism
- Transcription, Genetic
- Up-Regulation
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Affiliation(s)
- A Ito
- Department of Pathology, Osaka University Medical School, Suita, Japan.
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Nakamoto K, Ito A, Watabe K, Koma Y, Asada H, Yoshikawa K, Shinomura Y, Matsuzawa Y, Nojima H, Kitamura Y. Increased expression of a nucleolar Nop5/Sik family member in metastatic melanoma cells: evidence for its role in nucleolar sizing and function. Am J Pathol 2001; 159:1363-74. [PMID: 11583964 PMCID: PMC1850506 DOI: 10.1016/s0002-9440(10)62523-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/03/2001] [Indexed: 01/12/2023]
Abstract
F10 and BL6 cells of B16 mouse melanoma cells are metastatic after intravenous injection, but only BL6 cells can metastasize to lungs after subcutaneous injection. Differences in gene expression between the two cell lines were examined, and a greater expression of the Sik-similar protein (Sik-SP) gene was found in BL6 cells. Structurally, Sik-SP belongs to the nucleolar Nop5/Sik family whose members play central roles in ribosome biogenesis; however, the function of Sik-SP has not been examined. Cytology with green fluorescent protein-fused proteins showed that Sik-SP was localized to the nucleolus. To examine whether Sik-SP is involved in ribosome biogenesis, two parameters were measured: magnitude of ribosomal RNA synthesis per nucleus and magnitude of protein production from the same amount of mRNA of an exogenous luciferase gene. Both values and, in addition, nucleolar size were larger in COS-7 monkey kidney cells overexpressing Sik-SP and BL6 cells than in mock-transfected COS-7 and F10 cells, respectively. Sik-SP seemed to promote ribosome biogenesis in the nucleolus. Furthermore, the expression of Sik-SP seemed to confer a greater cell growth response to serum, because such a response was greater in BL6 cells and F10 cells overexpressing Sik-SP than in untreated and mock-transfected F10 cells. Sik-SP may render melanoma cells more competent to survive through augmenting the activity of nucleolus.
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Affiliation(s)
- K Nakamoto
- Department of Molecular Genetics, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
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Koma Y, Watanabe M, Nemoto S, Tanaka Y. A COUNTER CURRENT EXPERIMENT FOR THE SEPARATION OF TRIVALENT ACTINIDES AND LANTHANIDES BY THE SETFICS PROCESS. Solvent Extraction and Ion Exchange 1998. [DOI: 10.1080/07366299808934584] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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31
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Ueda Y, Kamiya M, Koma Y, Koyama K, Ojima H, Shikakura S. Potential reprocessing improvements in the Advanced Fuel Recycle System. Progress in Nuclear Energy 1998. [DOI: 10.1016/s0149-1970(97)00028-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Mitsugashira T, Koma Y, Hirai S, Okada I, Kurashima N, Sakurai H. Neutron activation analysis for ultra low contents of uranium and thorium in aluminium and silica. J Radioanal Nucl Chem 1991. [DOI: 10.1007/bf02039567] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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