The cover is designed with white hexagons similar to the pattern in a tortoise shell, an ancient Japanese symbol of people’s wish for longer lives. Coincidentally, this shape is the same as that of core fuel assemblies for both the prototype fast breeder reactor “MONJU” and the high temperature engineering test reactor “HTTR”.
The images on the cover show detailed molten materials accumulation behavior inside the pedestal by mechanistic numerical simulation code, JUPITER (top left) and visualization result of radioactive substances inside the turbine building of the TEPCO’s Fukushima Daiichi NPS (1F) Unit 3 (bottom right).
The top left image shows the detailed molten materials accumulation behavior inside the pedestal. Melt relocation and accumulation behavior of the main component of core internals such as UO2, SUS and Zry are inflowed and are calculated mechanistically by JUPITER (Chapter 1, Topic 1-1, p.11).
The bottom right image shows the color image of the radioactive substances obtained using the compact Compton camera in the 1F building, which is the high-dose rate environment. We detected the local contamination near the hose crawled on the floor surface (Chapter 1, Topic 1-7, p.17).
About the activity status of the whole agency
including CSR, see the annual report
Japan Atomic Energy Agency 2018
JAEA R&D Review 2018–19
Kenji Tatematsu, Tomoaki Suzudo, Ayako Okubo, Shinichi Koyama, This publication is issued by Japan Atomic Energy Agency (JAEA) on a yearly basis. Address:2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan Phone:+81-29-282-6387, Facsimile:+81-29-282-5920, All Rights Reserved by JAEA ©2019
Published by
Japan Atomic Energy Agency in January 2019
Editorial Board
Chief editor:Hiroshi Nakashima
Editors:
Yutaka Sugita, Fumitaka Esaka, Shinichi Shamoto, Yasuji Morita,
Takamasa Mori, Yukiharu Takeda, Kenji Sakai, Takashi Takata,
Shoji Takada, Hirotsugu Hamada, Takashi Mizuno, Kazuhiko Sato
Inquiries about availability and/or copyright of the contents in this publication should be addressed
to Institutional Repository Section, Intellectual Resources Management and R&D Collaboration
Department, Japan Atomic Energy Agency (JAEA).
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