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JAEA Reports

In-situ dismantling of the liquid waste storage tank LV-1 in the JRTF; The Dismantling work

Yokozuka, Yuta; Sunaoshi, Mizuho*; Sakai, Tatsuya; Fujikura, Toshiki; Handa, Yuichi; Muraguchi, Yoshinori; Mimura, Ryuji; Terunuma, Akihiro

JAEA-Technology 2021-037, 44 Pages, 2022/03

JAEA-Technology-2021-037.pdf:10.84MB

JAEA has dismantled equipment and instrument in the JAERI's Reprocessing Test Facility (JRTF) since 1996 as a part of its decommissioning. Starting in JFY 2007, in the annex building B which stored liquid waste generated in wet reprocessing tests, the liquid waste storage tank LV-1 installed in the LV-1 room of the first basement was dismantled with the in-situ dismantling method. The dismantling work is described in this report. Data on manpower, radiation control, and waste in the preparation work were collected, and its work efficiency was analyzed.

JAEA Reports

In-situ dismantling of the liquid waste storage tank LV-1 in the JRTF; The Dismantling preparation work

Yokozuka, Yuta; Sunaoshi, Mizuho*; Fujikura, Toshiki; Suzuki, Shota; Muraguchi, Yoshinori; Handa, Yuichi; Mimura, Ryuji; Terunuma, Akihiro

JAEA-Technology 2020-017, 56 Pages, 2021/01

JAEA-Technology-2020-017.pdf:7.88MB

JAEA has dismantled equipment and instrument in the JAERI's Reprocessing Test Facility (JRTF) since 1996 as a part of its decommissioning. Starting in JFY 2007, in the annex building B which stored liquid waste generated in wet reprocessing tests, the liquid waste storage tank LV-1 installed in the LV-1 room of the first basement was dismantled with the in situ dismantling method. The dismantling preparation work is described in this report. Data on manpower, radiation control, and waste in the preparation work were collected, and its work efficiency was analyzed.

JAEA Reports

Maintenance of the Evaporator-II in Waste Treatment Facility No.2 (FY2015)

Handa, Yuichi; Nakajima, Ryota; Yonekawa, Akihisa*; Takatsu, Kazuki; Kinoshita, Junichi; Irie, Hirobumi; Suzuki, Hisao*

JAEA-Technology 2020-005, 22 Pages, 2020/06

JAEA-Technology-2020-005.pdf:6.43MB

The Evaporator-II is installed in Waste Treatment Facility No.2. The evaporator system treats intermediate level radioactive liquid waste for Nuclear Science Research Institute and more. It is maintenance the evaporator can once/3years by the maintenance plan. The evaporator can is important unit of the Evaporator-II system. This report summarizes record of maintenance the Evaporator-II in FY2015.

Journal Articles

A Suitable procedure for preparing of water samples used in radiocarbon intercomparison

Takahashi, Hiroshi*; Minami, Masayo*; Aramaki, Takafumi*; Handa, Hiroko*; Kokubu, Yoko; Ito, Shigeru*; Kumamoto, Yuichiro*

Radiocarbon, 61(6), p.1879 - 1887, 2019/12

 Times Cited Count:2 Percentile:11.66(Geochemistry & Geophysics)

Water sample for interlaboratory comparison (here after "comparison water") must have inalterable $$^{14}$$C concentration during the comparison campaign and inter-batches homogeneity. In this study, the procedure for preparing of comparison water was discussed. We employed that comparison waters were artificially made by mixing chemical reagents, controlling $$^{14}$$C concentration and chemical composition. We could prepare six comparison waters, having 1, 14, 37, 56, 72 and 100 pMC, respectively. The stable carbon isotopic values and chemical compositions of some batches were measured to exanimate the inter- batches homogeneity. The $$^{14}$$C discrepancies among the batches were negligible for the inter-laboratory comparison. Finally, the results of trial comparison in Japan will be presented. Most of $$^{14}$$C results of CO$$_{2}$$ extracted by six laboratories showed good agreements each other.

Journal Articles

Assessment of calculation model for annular core on the HTTR

Nojiri, Naoki; Handa, Yuichi*; Shimakawa, Satoshi; Goto, Minoru; Kaneko, Yoshihiko*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 5(3), p.241 - 250, 2006/09

It was shown from the annular core experiment of the HTTR that the discrepancy of excess reactivity between experiment and analysis reached about 3 % Dk/k at maximum. Sensitivity analysis for the annular core of the HTTR was performed to improve the discrepancy. The SRAC code system was used for the core analysis. As the results of the analysis, it was found clearly that the multiplication factor of the annular core is affected by (1) mesh interval in the core diffusion calculation, (2) mesh structure of graphite region in fuel lattice cell and (3) the Benoist's anisotropic diffusion coefficients. The significantly large discrepancy previously reported was reduced down to about 1 % Dk/k by the revised annular core model.

JAEA Reports

Fission Gas Release Loop

; Shiba, Koreyuki;

JAERI 1121, 42 Pages, 1967/01

JAERI-1121.pdf:2.54MB

no abstracts in English

Journal Articles

Studies of ceramic fuels with the use of fiession gas release loop.1; Fission gas release from UO$$_{2}$$-graphite mixture during irradiation

; Shiba, Koreyuki; ; Seishi Yajima*; ; Takeshi Fukuda*; Yoshihisa Takahashi*; Takaaki Tanifuji*; Shunzo Omori*

Journal of Nuclear Science and Technology, 4(4), p.164 - 170, 1967/00

 Times Cited Count:8

no abstracts in English

Journal Articles

Studies of ceramic fuels with the use of fission gas release loop.2; Measurement of $$gamma$$-ray spectrum of fission gases

; Shiba, Koreyuki; ; ; Takeshi Fukuda*; Takaaki Tanifuji*; Shunzo Omori*

Journal of Nuclear Science and Technology, 4(5), p.231 - 238, 1967/00

 Times Cited Count:5

no abstracts in English

Journal Articles

None

; Shiba, Koreyuki; ;

Nihon Genshiryoku Gakkai-Shi, 8(1), p.3 - 11, 1966/00

no abstracts in English

JAEA Reports

$$gamma$$-ray spectra of short half-life nuclides

Kamemoto, Yuichiro; Shiba, Koreyuki; Handa, Nuneo; Okada, Minoru

JAERI 4019, 20 Pages, 1961/10

JAERI-4019.pdf:0.5MB

no abstracts in English

Journal Articles

Simultaneous determination of scandium and dysprosium

*; ; Shiba, Koreyuki;

Nihon Kagaku Zasshi, 82(7), p.845 - 847, 1961/00

 Times Cited Count:2

no abstracts in English

Oral presentation

Introduction of the Decommissioning Project in Nuclear Science Research Institute

Handa, Yuichi

no journal, , 

Presenting the introduction and effects of the Decommissioning Project that started at the Nuclear Science Research Institute in FY2022.

12 (Records 1-12 displayed on this page)
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