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Journal Articles

Verification of probabilistic fracture mechanics analysis code for reactor pressure vessel

Li, Y.; Katsumata, Genshichiro*; Masaki, Koichi; Hayashi, Shotaro*; Itabashi, Yu*; Nagai, Masaki*; Suzuki, Masahide*; Kanto, Yasuhiro*

Journal of Pressure Vessel Technology, 143(4), p.041501_1 - 041501_8, 2021/08

 Times Cited Count:0 Percentile:0(Engineering, Mechanical)

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.

Journal Articles

Behavior of radiocesium in sediments in Fukushima coastal waters; Verification of desorption potential through pore water

Otosaka, Shigeyoshi*; Kambayashi, Shota*; Fukuda, Miho*; Tsuruta, Tadahiko; Misono, Toshiharu; Suzuki, Takashi; Aono, Tatsuo*

Environmental Science & Technology, 54(21), p.13778 - 13785, 2020/11

 Times Cited Count:3 Percentile:52.46(Engineering, Environmental)

Concentrations of $$^{137}$$Cs in seawater, seabed sediment, and pore water collected from the area around Fukushima were investigated from 2015 to 2018, and the potential of coastal sediments to supply radiocesium to the bottom environment was evaluated. The $$^{137}$$Cs concentration in the pore water ranged from 33 to 1934 mBq L$$^{-1}$$ and was 10-40 times higher than that in the overlying water (seawater overlying within 30 cm on the seabed). At most stations, the $$^{137}$$Cs concentrations in the overlying water and the pore water were approximately proportional to those in the sediment. The conditional partition coefficient between pore water and sediment was 0.9-14$$times$$10$$^{2}$$ L kg$$^{-1}$$, independent of the year of sampling. These results indicated that an equilibrium of $$^{137}$$Cs between pore water and sediment has established in a relatively short period, and $$^{137}$$Cs in the pore water is gradually exported to seawater near the seabed. A simple box model estimation based on these results showed that the $$^{137}$$Cs in the sediment was decreased by about 6% per year by desorption/diffusion of $$^{137}$$Cs from the seabed.

Journal Articles

Verification of probabilistic fracture mechanics analysis code PASCAL

Li, Y.; Katsumata, Genshichiro*; Masaki, Koichi*; Hayashi, Shotaro*; Itabashi, Yu*; Nagai, Masaki*; Suzuki, Masahide*; Kanto, Yasuhiro*

Proceedings of 25th International Conference on Nuclear Engineering (ICONE-25) (CD-ROM), 10 Pages, 2017/07

In Japan, a PFM analysis code PASCAL (PFM Analysis of Structural Components in Aging LWR) has been developed by the Japan Atomic Energy Agency to evaluate the through-wall cracking frequencies of Japanese reactor pressure vessels (RPVs) considering neutron irradiation embrittlement and pressurized thermal shock transients. In this study, as a part of the verification activities, a working group was established in Japan, with seven organizations from industry, universities and institutes voluntarily participating as members. The source program of PASCAL was released to the members of the working group. Through one year activities, the applicability of PASCAL for structural integrity assessments of domestic RPVs was confirmed with great confidence. This paper presents the details of the verification activities of the working group including the verification plan, approaches and results.

JAEA Reports

Activities of Working Group on Verification of PASCAL; Fiscal year 2015

Li, Y.; Hayashi, Shotaro*; Itabashi, Yu*; Nagai, Masaki*; Kanto, Yasuhiro*; Suzuki, Masahide*; Masaki, Koichi*

JAEA-Review 2017-005, 80 Pages, 2017/03

JAEA-Review-2017-005.pdf:16.85MB

For the improvement of the structural integrity assessment methodology on reactor pressure vessels (RPVs), the probabilistic fracture mechanics (PFM) analysis code PASCAL has been developed and improved in JAEA based on latest knowledge. The PASCAL code evaluates the failure probabilities and frequencies of Japanese RPVs under transient events such as pressurized thermal shock considering neutron irradiation embrittlement. In order to confirm the reliability of the PASCAL as a domestic standard code and to promote the application of PFM on the domestic structural integrity assessments of RPVs, it is important to verify the probabilistic variables, functions and models incorporated in the PASCAL and summarize the verification processes and results as a document. On the basis of these backgrounds, we established a working group, composed of experts on this field besides the developers, on the verification of the PASCAL3 which is a PFM analysis module of PASCAL, and the source program of PASCAL3 was released to the members of working group. Through one year activities, the applicability of PASCAL in structural integrity assessments of domestic RPVs was confirmed with great confidence. This report summarizes the activities of the working group on the verification of PASCAL in FY2015.

Journal Articles

Collective structural changes in vermiculite clay suspensions induced by cesium ions

Motokawa, Ryuhei; Endo, Hitoshi*; Yokoyama, Shingo*; Nishitsuji, Shotaro*; Kobayashi, Toru; Suzuki, Shinichi; Yaita, Tsuyoshi

Scientific Reports (Internet), 4, p.6585_1 - 6585_6, 2014/10

 Times Cited Count:32 Percentile:75.98(Multidisciplinary Sciences)

Oral presentation

Observation of gas entrainment from free surface by vortex and measurement of entrained gas flow rate

Suzuki, Hiroyuki*; Koizumi, Yasuo*; Okazaki, Shotaro*; Ito, Kei; Ohshima, Hiroyuki

no journal, , 

The occurrence of the gas entrainment (GE) phenomenon in a simple experimental system (cylindrical tank) was investigated under several conditions, i.e. liquid depth and inlet flow rate. Under GE occurrence conditions, the flow rate of the entrainment gas was measured. In addition, based on the experimental results, the mechanism of the GE occurrence was discussed.

Oral presentation

Mechanism of transient boiling phenomena generated by microwave heating

Suzuki, Shota*; Kaneko, Akiko*; Abe, Yutaka*; Suzuki, Masahiro; Segawa, Tomomi; Fujii, Kanichi

no journal, , 

The influences of vessel, solution and heating properties for boiling behavior were evaluated to clear them in the electro-magnetic wave (microwave) heating of the de-nitrate conversion process of nuclear fuel cycle. Boiling and fluid behavior of solution were observed by the high speed video camera, the temperature of solution level were measured by radiation thermography, and the temperature of the vessel surface was measured by thermography. The temperature of solution level was 103.2 degree, which showed that the solution was overheated. The corrected temperature on the vessel surface measured by thermography was 105.8 degree. It is expected that the inner temperature of solution is higher than that of vessel surface. It is considered that the energy of microwave concentrates at the core of solution, and flushing is leaded by generating the uniform nucleation according to overheating.

Oral presentation

Spin/Orbital/Element specific hysteresis curve of TbCo perpendicular magnetic anisotropy film with a high squareness ratio

Takubo, Shota*; Agui, Akane; Liu, X.*; Suzuki, Kosuke*; Sakurai, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

In situ stress characterization of Si(111) 7$$times$$7 reconstruction

Asaoka, Hidehito; Uozumi, Yuki; Suzuki, Shota*; Yamaguchi, Kenji

no journal, , 

no abstracts in English

Oral presentation

Microscopic magnetization curves of Tb$$_{23}$$Co$$_{77}$$ film

Agui, Akane; Sakurai, Hiroshi*; Takubo, Shota*; Suzuki, Kosuke*; Liu, X.*

no journal, , 

no abstracts in English

Oral presentation

Spin and orbital selective magnetization curves of Tb$$_{23}$$Co$$_{77}$$ film

Agui, Akane; Sakurai, Hiroshi*; Suzuki, Kosuke*; Takubo, Shota*; Liu, X.*

no journal, , 

no abstracts in English

Oral presentation

Spin and orbital selective magnetization curves of Tb-Co film

Agui, Akane; Sakurai, Hiroshi*; Suzuki, Kosuke*; Takubo, Shota*; Liu, X.*

no journal, , 

no abstracts in English

Oral presentation

Mesoscopic structure of vermiculite and weathered biotite clays in suspension with and without cesium ions; Small-angle X-ray and neutron scattering studies

Motokawa, Ryuhei; Endo, Hitoshi*; Yokoyama, Shingo*; Nishitsuji, Shotaro*; Yaita, Tsuyoshi; Kobayashi, Toru; Suzuki, Shinichi

no journal, , 

no abstracts in English

Oral presentation

Mesoscopic structure of vermiculite and weathered biotite clays in suspension with and without cesium ions

Motokawa, Ryuhei; Endo, Hitoshi*; Yokoyama, Shingo*; Nishitsuji, Shotaro*; Yaita, Tsuyoshi; Kobayashi, Toru; Suzuki, Shinichi

no journal, , 

no abstracts in English

Oral presentation

Evaluation of clean Si(110) surface prepared by using different chemical process

Suzuki, Shota; Asaoka, Hidehito; Uozumi, Yuki; Yamaguchi, Kenji

no journal, , 

no abstracts in English

Oral presentation

Fabrication of clean Si(110) surface in large area and evaluation of the structure

Suzuki, Shota; Asaoka, Hidehito; Uozumi, Yuki; Yamaguchi, Kenji

no journal, , 

no abstracts in English

Oral presentation

Analysis of Si(110) clean surfaces after desorption of hydrogen terminated layer and oxidized layer

Suzuki, Shota; Asaoka, Hidehito; Uozumi, Yuki; Kondo, Keietsu; Yamaguchi, Kenji

no journal, , 

no abstracts in English

Oral presentation

Low temperature formation of Si(110)-16$$times$$2 through wet etching

Yano, Masahiro; Suzuki, Shota; Uozumi, Yuki; Asaoka, Hidehito

no journal, , 

Oral presentation

The effects of Si(110) surface heating on fabricating 16$$times$$2 single and double domain structure

Suzuki, Shota; Yano, Masahiro; Uozumi, Yuki; Asaoka, Hidehito; Yamaguchi, Kenji*

no journal, , 

no abstracts in English

25 (Records 1-20 displayed on this page)