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Journal Articles

Experiences in dismantlement of gloveboxes for wet recovery and other use that are contaminated with nuclear fuel materials

Kitamura, Akihiro; Hirano, Hiroshi*; Yoshida, Masato; Takeuchi, Kentaro

Hoken Butsuri (Internet), 58(2), p.76 - 90, 2023/08

https://doi.org/10.5453/jhps.58.76

The alpha contaminated gloveboxes have been dismantled for over 20 years in Plutonium Fuel Fabrication Facility. The so called wet recovery equipment gloveboxes, which recover plutonium and uranium from scrap fuel by dissolving and extracting processes, were chosen as the priority gloveboxes to be dismantled. These gloveboxes and other gloveboxes in the same room were size reduced and removed up until 2022. Also, non-radioactive ancillary facility and non-radioactive giant glovebox were removed from 2007 to 2010 for ease of glovebox dismantling activities that follows and for making waste storage spaces. Several incidents were occurred and recidivism prevention measures were implemented on each occasion. In this report, glovebox dismantling activities we conducted in the past 20 years are reviewed and lessons we have learned are summarized.

Journal Articles

Application of $$gamma$$ rays from D($$alpha$$,$$gamma$$)$$^{6}$$Li and $$^{19}$$F($$alpha$$,n)$$^{22}$$Na to alpha particle diagnostics

Ochiai, Kentaro; Kubota, Naoyoshi; Taniike, Akira*; Kitamura, Akira*; Kondo, Keitaro*; Nishitani, Takeo

Fusion Science and Technology, 51(2T), p.262 - 264, 2007/02

https://doi.org/10.13182/FST07-A1369
 Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)

For the density of 3.5-MeV $$alpha$$ particle and the leakage $$alpha$$ particle in D-T plasmas, we propose the observation of 2.186-MeV $$gamma$$-ray produced by D($$alpha$$,$$gamma$$)$$^{6}$$Li reaction and the use of the activation method by $$^{19}$$F($$alpha$$,n)$$^{22}$$Na reaction, respectively. In order to verify these reaction rates, we have carried out the irradiation experiments by means of helium ion bombardment into a deuteride polyethylene and a calcium floride crystal samples. From our experiment, D($$alpha$$,$$gamma$$)$$^{6}$$Li reaction rate is estimated to be 10$$^{13}$$m$$^{-3}$$s$$^{-1}$$in the ITER typical plasma condition. So we obtained good prospect of the $$gamma$$-ray measurement as the confined $$alpha$$ diagnostics by using high efficiency detector. Also, it was found that The number of leakage alpha particles in order of 10$$^{18}$$m$$^{2}$$ could be estimated by the activation method with $$^{19}$$F($$alpha$$,n)$$^{22}$$Na.

JAEA Reports

Quantitative analysis on the surface of Lithium-6 enriched lithium titanate using proton RBS (Cooperative research)

Kubota, Naoyoshi; Fujiwara, Yoshio*; Okumura, Kazutaka*; Ochiai, Kentaro; Kitamura, Akira*; Furuyama, Yuichi*; Taniike, Akira*; Nishitani, Takeo

JAEA-Research 2006-019, 15 Pages, 2006/06

JAEA-Research-2006-019.pdf:0.75MB

Surface analysis of lithium-6 ($$^{6}$$Li) was performed for both 95 % and 40 % $$^{6}$$Li-enriched lithium titanate (Li$$_{2}$$TiO$$_{3}$$) samples as the candidate tritium breeding material using 2.6 MeV-proton Rutherford Backscattering Spectroscopy (RBS). The depth resolution of this method was enough to measure the $$^{6}$$Li depth profile in terms of the evaluation of thermal neutron transportation. The atomic density of $$^{6}$$Li could be measured within the error of 27 % for both samples although the accuracy of 5 % was not achieved for the evaluation of tritium breeding. It was confirmed that the sample atomic compositions agreed with Li$$_{2}$$TiO$$_{3}$$ within errors of 30 % for Li/Ti and 15 % for O/Ti. The whole errors were caused by the data accuracy of scattering cross sections predominately. Providing more accurate cross section data can lead to the utilization of the RBS method for tritium breeding materials analysis.

Journal Articles

Intrinsic pinning does not influence the vortex melting transition of YBa$$_{2}$$Cu$$_{3}$$O$$_{6.94}$$ in H$$perp$$c configuration

Ishida, Takekazu*; Kitamura, Kentaro*; Okuda, Kiichi*; Asaoka, Hidehito

Journal of the Physical Society of Japan, 70(7), p.2110 - 2113, 2001/07

https://doi.org/10.1143/JPSJ.70.2110
 Times Cited Count：3 Percentile：27.48(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Neutron inelastic scattering study of densified GeO$$_{2}$$ glass

Suzuya, Kentaro; Shibata, Kaoru*; Umesaki, Norimasa*; Kitamura, Naoyuki*; Kohara, Shinji*

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.256 - 258, 2001/05

no abstracts in English

Oral presentation

Measurement of $$gamma$$-ray by $$^{4}$$He(d,$$gamma$$)reaction and its application for burning plasma diagnostics

Kubota, Naoyoshi; Ochiai, Kentaro; Taniike, Akira*; Kitamura, Akira*

no journal, , 

no abstracts in English

Oral presentation

Measurement of Li isotope distribution in Li$$_2$$TiO$$_3$$ for blanket materials of fusion reactor using nuclear reaction analysis

Takahashi, Genki*; Furuyama, Yuichi*; Okamoto, Masanori*; Kawatsu, Sho*; Taniike, Akira*; Kitamura, Akira*; Kubota, Naoyoshi; Ochiai, Kentaro; Nishitani, Takeo

no journal, , 

no abstracts in English

Oral presentation

Composition analysis of Li compounds for blanket candidate materials with accelerator analysis

Takahashi, Genki*; Kawatsu, Sho*; Unehara, Hiroshi*; Furuyama, Yuichi*; Taniike, Akira*; Kitamura, Akira*; Ochiai, Kentaro; Kubota, Naoyoshi; Nishitani, Takeo

no journal, , 

no abstracts in English

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