Interim activity status report of "the group for investigation of reasonable safety assurance based on graded approach" (from September, 2019 to September, 2020)

Yonomoto, Taisuke; Nakashima, Hiroshi*; Sono, Hiroki; Kishimoto, Katsumi; Izawa, Kazuhiko; Kinase, Masami; Osa, Akihiko; Ogawa, Kazuhiko; Horiguchi, Hironori; Inoi, Hiroyuki; et al.

JAEA-Review 2020-056, 51 Pages, 2021/03

JAEA-Review-2020-056.pdf:3.26MB

A group named as "The group for investigation of reasonable safety assurance based on graded approach", which consists of about 10 staffs from Sector of Nuclear Science Research, Safety and Nuclear Security Administration Department, departments for management of nuclear facility, Sector of Nuclear Safety Research and Emergency Preparedness, aims to realize effective graded approach (GA) about management of facilities and regulatory compliance of JAEA. The group started its activities in September, 2019 and has had discussions through 10 meetings and email communications. In the meetings, basic ideas of GA, status of compliance with new regulatory standards at each facility, new inspection system, etc were discussed, while individual investigation at each facility were shared among the members. This report is compiled with expectation that it will help promote rational and effective safety management based on GA by sharing contents of the activity widely inside and outside JAEA.

U-Pb dating of calcite using LA-ICP-MS; Instrumental setup for non-matrix-matched age dating and determination of analytical areas using elemental imaging

Yokoyama, Tatsunori; Kimura, Junichi*; Mitsuguchi, Takehiro; Danhara, Toru*; Hirata, Takafumi*; Sakata, Shuhei*; Iwano, Hideki*; Maruyama, Seiji*; Chang, Q.*; Miyazaki, Takashi*; et al.

Geochemical Journal, 52(6), p.531 - 540, 2018/12

https://doi.org/10.2343/geochemj.2.0541

Effect of Si interlayers on the magnetic and mechanical properties of Fe/Ge neutron polarizing multilayer mirrors

Maruyama, Ryuji; Yamazaki, Dai; Okayasu, Satoru; Takeda, Masayasu; Zettsu, Nobuyuki*; Nagano, Mikinori*; Yamamura, Kazuya*; Hayashida, Hirotoshi; Soyama, Kazuhiko

Journal of Applied Physics, 111(6), p.063904_1 - 063904_10, 2012/03

https://doi.org/10.1063/1.3694001

no abstracts in English

Crystal growth procedure of HIV-1 protease-inhibitor KNI-272 complex for neutron structural analysis at 1.9 resolution

Shimizu, Noriko*; Sugiyama, Shigeru*; Maruyama, Mihoko*; Takahashi, Yoshinori*; Adachi, Motoyasu; Tamada, Taro; Hidaka, Koshi*; Hayashi, Yoshio*; Kimura, Toru*; Kiso, Yoshiaki*; et al.

Crystal Growth & Design, 10(7), p.2990 - 2994, 2010/06

https://doi.org/10.1021/cg100054s

We report crystal growth of human immunodeficiency virus 1 protease (HIV PR) in a complex with its inhibitor KNI-272 by six different methods. Comparative analysis indicates that top-seeded solution growth (TSSG) and TSSG combined with the floating and stirring technique (TSSG-FAST) are efficient strategies for rapidly obtaining large single crystals and effectively preventing polycrystallization of the seed crystal. Neutron diffraction analysis confirmed that the crystalobtained by TSSG is a high-quality single crystal. Furthermore, crystal shape was observed to be influenced by solution flow, suggesting that the degree of supersaturation significantly affects the crystal growth direction of HIV PR complex. This finding implies that the shape of the HIV PR complex crystal might be controlled by the solution flow rate.

A Beam divergence correction mirror for neutron resonance spin echo

Maruyama, Ryuji; Hino, Masahiro*; Hayashida, Hirotoshi; Kitaguchi, Masaaki*; Achiwa, Norio*; Yamazaki, Dai; Ebisawa, Toru*; Soyama, Kazuhiko

Physica B; Condensed Matter, 404(17), p.2594 - 2599, 2009/09

https://doi.org/10.1016/j.physb.2009.06.036

Neutron resonance spin echo (NRSE) is one of the most useful techniques for quasi-elastic scattering with high energy resolution. The path length variation due to the beam divergence has to be corrected in high resolution NRSE measurement because it gives the limit in the energy resolution. A neutron focusing technique using neutron supermirrors is effective to overcome this problem. When a cylindrical shaped neutron supermirror placed in the center of the flight path with a pair of RSFs has the object and the image plane corresponding to the each coil plane of the first and the second RSF, the path length difference can be corrected for the neutron beam with large divergent angle, which leads to the realization of high intensity as well as high resolution in NRSE measurement. In this study, the correction method of the beam divergence with a cylindrical shaped supermirror and its experimental results are discussed.

Development of high-reflectivity neutron supermirrors using an ion beam sputtering technique

Maruyama, Ryuji; Yamazaki, Dai; Ebisawa, Toru*; Soyama, Kazuhiko

Nuclear Instruments and Methods in Physics Research A, 600(1), p.68 - 70, 2009/02

https://doi.org/10.1016/j.nima.2008.11.062

Neutron supermirrors have been utilized as reflective optical devices at many neutron sources for transporting, focusing, polarizing neutron beam. In order to produce such devices for the new spallation neutron source (Japan Proton Accelerator Research Complex, J-PARC), an ion beam sputtering system with an effective deposition area of 0.2 m has been installed in the Japan Atomic Energy Agency. The fabrication methods and the performance of the supermirrors are discussed.

Development of a neutron reflectometer SUIREN at JRR-3

Yamazaki, Dai; Moriai, Atsushi; Tamura, Itaru; Maruyama, Ryuji; Ebisawa, Toru*; Takeda, Masayasu; Soyama, Kazuhiko

JAEA-Technology 2007-030, 21 Pages, 2007/03

JAEA-Technology-2007-030.pdf:4.13MB

A new neutron reflectometer "SUIREN" has been developed and started its operation at the research reactor JRR-3 of JAEA in 2006. SUIREN (Apparatus for Surface and Interface investigations with Reflection of Neutrons) provides monochromatic neutron beam with wavelength of 3.8 and vertical sample geometry, which is suitable for studies on interfaces involving solid layers of soft materials, magnetic materials, neutron mirrors and many other things. Collimated neutron intensity is about 2.110 2.610 n/s/cm with =0.08 deg at the sample position. Background is as low as 4.510 n/s when a local beam shutter is closed. A demonstration experiment showed that specular reflectivity of a silicon substrate of 3 inches in diameter can be measured down to 10 over 0 Qz 0.22 in 27 hours. This paper describes the beam-line and components of the SUIREN reflectometer, some results of test measurements and future plans.

Development of neutron supermirror with large-scale ion-beam sputtering instrument

Maruyama, Ryuji; Yamazaki, Dai; Ebisawa, Toru*; Hino, Masahiro*; Soyama, Kazuhiko

Physica B; Condensed Matter, 385-386(2), p.1256 - 1258, 2006/11

https://doi.org/10.1016/j.physb.2006.06.024

Neutron supermirror has become an important device to transport, bending and focusing a neutron beam. We have developed it using ion beam sputtering (IBS) instrument since it enables us to produce good quality layers with high density and small grain size. We have also investigated ion-polishing technique, which suppresses the interface roughness of multilayers. We have now installed new IBS instrument with effective deposit area of 500 mm in diameter for the realization of supermirror guide and bender with large effective critical angle. In this presentation, the performance of the supermirrors fabricated with it and the future development of neutron optical devices using supermirrors will be discussed.

Performance test of neutron resonance spin echo at a pulsed source

Maruyama, Ryuji*; Tasaki, Seiji*; Hino, Masahiro*; Takeda, Masayasu; Ebisawa, Toru*; Kawabata, Yuji*

Nuclear Instruments and Methods in Physics Research A, 530(3), p.505 - 512, 2004/09

https://doi.org/10.1016/j.nima.2004.04.233

Neutron resonance spin echo (NRSE) spectroscopy enables us to measure neutron quasielastic scattering with high energy resolution. It is desirable to apply NRSE spectroscopy to pulsed neutron sources because this application allows a very wide range of the spin echo time. We have already developed the neutron resonance spin flipper applicable to a polychromatic pulsed neutron beam, which is necessary for the TOF-NRSE method. Using this flipper, we have succeeded in observing spin echo signals with visibility higher than 0.65 for the pulsed neutron beam with wavelength from 0.3 to 0.9 nm. We discuss the prospect of the NRSE spectrometer with high energy resolution on the basis of the present result.

Study on Configuration and Structure of Faults

Sugawara, Masaaki*; Maruyama, Toru*; Kambara, Hiroshi*

JNC TJ7420 2005-047, 79 Pages, 2003/03

JNC-TJ7420-2005-047.pdf:12.71MB

Configuration and structure of the ore veins of the Toyoha mine, which occur in faults, were studied with the purpose of developing methods for investigating the effect of fault movement to groundwater flow. Information on the shape of the veins were acquired and analyzed. Plane vein maps in some levels and cross sections of four representative vein systems (Tajima-Harima, Izumo-Shinano, Soya, Sorachi) of the Toyoha ore deposit were scanned, and three-dimensional features of vein distributions were recorded as image data. Morphological characteristics of typical veins of the Toyoha ore deposit were extracted from vein maps, geological and mineralogical cross sections and vein sketches. A tendency of vein-shape changes is recognized from the upper to the lower parts; cymoid curve with strong lensing, gentle cymoid curve with relatively constant width, linear vein with relatively constant width in ascending order of depth. This is thought to be a morphological characteristics of shear fracture formed in correspondence with increase of confining pressure. Distribution of vein trace length of the Toyoha mine exist within the range of uncertainty in the figure between fracture trace length and cumulative number of fractures indicated by Ohtsu (2001). Thus, accumulated number of fracture trace length is thought to be in linear relation irrespective of size, region and rock ype.