[Table of Contents]

Plasma and Fusion Research

Volume 9, 1405139 (2014)

Regular Articles

Key Aspects of the Safety Study of a Water-Cooled Fusion DEMO Reactor
Makoto NAKAMURA, Kenji TOBITA, Youji SOMEYA, Hisashi TANIGAWA1), Werner GULDEN2), Yoshiteru SAKAMOTO, Takao ARAKI3), Kazuhito WATANABE3), Hisato MATSUMIYA3), Kyoko ISHII3), Hiroyasu UTOH, Haruhiko TAKASE5), Takumi HAYASHI1), Akira SATOU4), Taisuke YONOMOTO4), Gianfranco FEDERICI2) and Kunihiko OKANO6)
Japan Atomic Energy Agency, Rokkasho, Aomori 039-3212, Japan
1)
Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
2)
Fusion for Energy, c/o EFDA Garching and Max-Plank-Institut fuer Plasmaphysik, Garching D-85748, Germany
3)
Toshiba Corporation, Yokohama, Kanagawa 235-8523, Japan
4)
Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
5)
IFERC Project Team, Rokkasho, Aomori 039-3212, Japan
6)
The Graduate School of Science and Technology, Keio University, Yokohama 223-8522, Japan
(Received 4 August 2014 / Accepted 31 August 2014 / Published 31 October 2014)

Abstract

Key aspects of the safety study of a water-cooled fusion DEMO reactor is reported. Safety requirements, dose target, DEMO plant model and confinement strategy of the safety study are briefly introduced. The internal hazard of a water-cooled DEMO, i.e. identification of hazardous inventories, identification of stored energies that can mobilize these hazardous inventories and identification of accident initiators and scenarios, are evaluated. It is pointed out that the enthalpy in the first wall/blanket cooling loops, the decay heat and the energy potentially released by the Be-steam chemical reaction are of special concern for the water-cooled DEMO. An ex-vessel loss-of-coolant accident (ex-VV LOCA) of the first wall/blanket cooling loop is also quantitatively analyzed. The integrity of the building against the ex-VV LOCA is discussed.

Keywords

water-cooled fusion DEMO, safety study, hazard analysis, accident scenario analysis, safety system

DOI: 10.1585/pfr.9.1405139

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This paper may be cited as follows:

Makoto NAKAMURA, Kenji TOBITA, Youji SOMEYA, Hisashi TANIGAWA, Werner GULDEN, Yoshiteru SAKAMOTO, Takao ARAKI, Kazuhito WATANABE, Hisato MATSUMIYA, Kyoko ISHII, Hiroyasu UTOH, Haruhiko TAKASE, Takumi HAYASHI, Akira SATOU, Taisuke YONOMOTO, Gianfranco FEDERICI and Kunihiko OKANO, Plasma Fusion Res. 9, 1405139 (2014).