Hot cell equipment improvement effortsat Analytical Laboratory in Tokai Reprocessing Plant

Ishibashi, Atsushi; Masui, Kenji; Goto, Yuichi; Yamamoto, Masahiko; Taguchi, Shigeo; Ishikawa, Satoshi*; Ishikawa, Tomoya*

Nihon Hozen Gakkai Dai-19-Kai Gakujutsu Koenkai Yoshishu, p.18 - 21, 2023/08

An inner-box typed hot cell for analysis of highly radioactive samples has been operated for about 40 years in Tokai Reprocessing Plant since its installation in 1980. During the operation of analytical hot cell, improvement and upgrades including auxiliary equipment have been performed, in addition to keep the equipment in proper condition through periodic inspections and maintenance. This paper describes about these efforts for analytical hot cell and its results.

Feasibility study of technology for Pu solution monitoring including FP; Composition research of high active liquid waste and radiation measurement results on the surface of cell

Matsuki, Takuya; Masui, Kenji; Sekine, Megumi; Tanigawa, Masafumi; Yasuda, Takeshi; Tsutagi, Koichi; Ishiyama, Koichi; Nishida, Naoki; Horigome, Kazushi; Mukai, Yasunobu; et al.

Proceedings of INMM 57th Annual Meeting (Internet), 9 Pages, 2016/07

The International Atomic Energy Agency (IAEA) has proposed in its long-term research and development (R&D) plan, development of a real-time measurement technology to monitor and verify nuclear material movement continuously as part of an advanced approach to effectively and efficiently conduct safeguards for reprocessing facilities. Since the Tokai Reprocessing Plant (TRP) has solutions containing both Pu and fission products (FP), a new detector development project to monitor Pu with FP is being carried out from 2015 to 2017. This project is mainly conducted in the High Active Liquid Waste Storage (HALWS) in the TRP. For the first step of this project, as the confirmation of composition of high active liquid waste (HALW) to evaluate neutron/-ray emitted from solution in the selected HALW tank which has the most amount of Pu in HALW tanks at the TRP, we took HALW sample and conducted -ray spectrum measurement for HALW. As a study of detector setting location, to survey the available neutron/-ray (i.e. intensity) at the outside surface of the cell where HALW tank is located, we implemented continuous measurement by neutron/-ray detector. In this paper, we report three -ray peaks related with Pu and Pu measured in the composition research of HALW, which is needed to identify Pu amount by the new detector that we are developing and the result of radiation measurement on the surface of the cell.

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in and Au+Au collisions at = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.

Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04

https://doi.org/10.1103/PhysRevC.83.044912

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.

Momentum dependence of Mott gap excitations in optimally doped YBaCuO studied by resonant inelastic X-ray scattering

Ishii, Kenji; Tsutsui, Kenji*; Endo, Yasuo*; Toyama, Takami*; Kuzushita, Kaori; Inami, Toshiya; Owada, Kenji; Maekawa, Sadamichi*; Masui, Takahiko*; Tajima, Setsuko*; et al.

AIP Conference Proceedings 850, p.445 - 446, 2006/09

https://doi.org/10.1063/1.2354776

Mott gap excitations in the optimally doped high- superconductor YBaCuO ( = 93 K) have been studied by the resonant inelastic X-ray scattering method. Anisotropic spectra in the -plane are observed in a twin-free crystal. The excitation from the one-dimensional CuO chain is enhanced at 2 eV near the zone boundary of the direction, while the excitation from the CuO plane is broad at 1.5-4 eV and almost independent of the momentum transfer. Theoretical calculation based on the one-dimensional and two-dimensional Hubbard model reproduces the observed spectra when different values of the on-site Coulomb energy are assumed. The Mott gap of the CuO chain site is found to be much smaller than that of the CuO plane site.

None

; Tateoka, Osamu; ; ; Masui, Kenji

Donen Giho, (75), p.52 - 58, 1990/09

https://jopss.jaea.go.jp/pdfdata/PNC-TN1340-90-003.pdf

None

Miyahara, Kenji; Asakura, Yoshiro*; ; Masui, J.*; Kondo, Isao*; ; Kamata, Masayuki;

PNC TN852 81-15, 46 Pages, 1981/04

PNC-TN852-81-15.pdf:2.23MB

None

Development of co-processing process the result of U/Pu co-processing process test and Monitoring Technique in U/Pu mixed solution

Masui, Kenji; Yanagibashi, Futoshi; Kuno, Takehiko; Tanaka, Kenji

no journal, , 

no abstracts in English

Development of flow injection/online liquid scintillation analysis system for the determination of alpha nuclides in fuel debris, 3; Analysis performance evaluation by measuring plutonium standard solution

Aoya, Juri; Masui, Kenji; Horigome, Kazushi; Yamamoto, Masahiko; Taguchi, Shigeo

no journal, , 

Determination of alpha nuclides is essential for transfer and storage of fuel debris. A flow injection analysis system combining solvent extraction and liquid scintillation detector has been developed for rapid determination of plutonium in the debris with high processing capability. Liquid sample containing plutonium has been fed into a static mixer by flowing carrier solution and contacted with an extractant Aliquat 336 dissolved in xylene. Then, the mixture has been separated into an aqueous phase and an organic phase by membrane separator to extract plutonium. The organic phase has been fed into a flow cell for liquid scintillation counting after mixed with liquid scintillator. The performance of the analysis system has been evaluated by measuring plutonium standard solution.

In-line determination of uranium, plutonium and acidity in spent fuel reprocessing for process monitoring on advanced nuclear material verification

Kuno, Takehiko; Okano, Masanori; Masui, Kenji; Suzuki, Yutaka; Yamada, Keiji; Watahiki, Masaru; Hiyama, Toshiaki

no journal, , 

no abstracts in English

Impact of Ex-VV LOCAs on main cooling system design of fusion Demo reactor

Masui, Akihiro; Nakamura, Makoto; Watanabe, Kazuhito; Someya, Yoji; Tanigawa, Hisashi; Tobita, Kenji

no journal, , 

When a pipe of tokamak cooling system breaks outside of vacuum vessel, it is necessary to keep integrity of buildings to prevent that tritium and ACP contained in coolant are released to environment. A load to buildings is affected by plant design parameters, for example mass of coolant, pipe diameter and volume of buildings. The impacts of these parameters on the load to buildings are shown based on thermal hydraulic analyses.