Contribution to risk reduction in decommissioning works by the elucidation of basic property of radioactive microparticles (Contract Research); FY2020 Nuclear Energy Science & Technology and Human Resource Development Project

Collaborative Laboratories for Advanced Decommissioning Science; Ibaraki University*

JAEA-Review 2023-021, 112 Pages, 2024/02

JAEA-Review-2023-021.pdf:7.1MB

The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2020. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2018, this report summarizes the research results of the "Contribution to Risk Reduction in Decommissioning Works by the Elucidation of Basic Property of Radioactive Microparticles" conducted from FY2018 to FY2021 (this contract was extended to FY2021). The present study aims to understand the basic properties (size, chemical composition, isotopic composition - including concentration of -emitters, electrostatic properties, and optical properties, etc.) of fine particles composed of silicate with insoluble properties which contain regions of highly concentrated radioactive cesium (Cs) released to the environment by the accident at the Fukushima Daiichi Nuclear Power Station of TEPCO in 2011 March.

Collective Thomson scattering based on CO laser for ion energy spectrum measurements in JT-60U

Kondoh, Takashi; Miura, Yukitoshi; Lee, S.*; Richards, R. K.*; Hutchinson, D. P.*; Bennett, C. A.*

Review of Scientific Instruments, 74(3), p.1642 - 1645, 2003/03

https://doi.org/10.1063/1.1532760

Measurements of energy spectrum and density profile of confined alpha-particles are required for ITER. Several methods have been proposed, however, a measurement technique hasn't been established yet. A collective Thomson scattering (CTS) system based on a pulsed CO laser is being developed to demonstrate feasibility of alpha-particle diagnostics for ITER. The pulse laser (15J, 1m, 0.6 m) and a wide band (~ 8GHz) heterodyne receiver with a quantum-well infrared photodetector (QWIP) have been developed and installed in the JT-60U tokamak. Stray light is reduced by a notch filter with hot CO gas. Heterodyne receiver is absolutely calibrated using large area blackbody radiation source. Scattered signal from JT-60U plasma has not detected because of electrical noise originated from discharge of the pulsed laser and stray signal caused by impurity of the spectrum of the pulsed laser.

Collective Thomson scattering using a pulsed CO laser in JT-60U

Kondoh, Takashi; Lee, S.; Hutchinson, D. P.*; Richards, R. K.*

Review of Scientific Instruments, 72(1), p.1143 - 1146, 2001/01

https://doi.org/10.1063/1.1322616

no abstracts in English

Analysis of neutron spectra from thick targets bombarded with 710-MeV particles by quantum molecular dynamics plus statistical decay model

Meigo, Shinichiro; Chiba, Satoshi; Shin, Kazuo*

Journal of Nuclear Science and Technology, 36(3), p.250 - 255, 1999/03

https://doi.org/10.3327/jnst.36.250

no abstracts in English

TAE mode stability in JT-60SU steady state plasmas

Ozeki, Takahisa; C.Z.Cheng*; Nagashima, Keisuke

Nuclear Fusion, 35(12), p.1553 - 1562, 1995/00

https://doi.org/10.1088/0029-5515/35/12/I16

no abstracts in English

The Effect of heat treatment on density and structure of SiC

; Ikawa, Katsuichi; Iwamoto, K.

Journal of Nuclear Materials, 92(2), p.351 - 353, 1980/00

https://doi.org/10.1016/0022-3115(80)90122-1

no abstracts in English

Charge Transfer Cross Section in Atomic Collisions

Ryufuku, Hiroshi

JAERI-M 6274, 50 Pages, 1975/10

JAERI-M-6274.pdf:1.09MB

no abstracts in English

Measurement of Distribution of Plasma Current in a Tokamak Device with -Particle Injected Transverse to the Toroidal Magnetic Field; Numerical Calculations of the Particle Orbits and Experimental Arrangement

*; ; Takeda, Tatsuoki

JAERI-M 5146, 31 Pages, 1973/02

JAERI-M-5146.pdf:0.64MB

no abstracts in English

Development of a remote continuous air monitoring system for measuring airborne alpha contamination

Usami, Hiroshi; Morishita, Yuki; Furuta, Yoshihiro; Aoki, Katsunori; Tsurudome, Koji; Hoshi, Katsuya; Torii, Tatsuo

no journal, , 

no abstracts in English