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Neutronics and Activation Analyses for Li/V-alloy and Flibe/V-alloy Blankets of FFHR2 with and without Beryllium

Zaixin LI, Teruya TANAKA¹⁾ and Takeo MUROGA¹⁾

The Graduate University for Advanced Studies

1)

National Institute for Fusion Science

(Received 31 January 2007 / Accepted 3 September 2007 / Published 31 October 2007)

Abstract

Neutronics analyses for Li/V-alloy and Flibe/V-alloy liquid blankets with and without external beryllium were performed for the FFHR2 design in order to assess the tritium breeding ratios (TBRs) and neutron shielding performances. Beryllium multiplier significantly improved the TBRs for both the Li/V-alloy and Flibe/V-alloy blankets. The shielding performance of the Li/V-alloy blanket with Be was greatly improved because the adequate TBRs can be obtained with the thinner breeding region than in the Li/V-alloy blanket without Be and the thickness of the shielding region was increased. On the other hard, the shielding performance of the Flibe/V-alloy blankets with and without external Be was comparable. It was shown that the Li/V-alloy and Flibe/V-alloy liquid blankets with and without solid Be satisfied the requirement for TBRs and shielding for the superconductor magnet of FFHR2. The activation of MHD coating of Er₂O₃ for the Li/V-alloy blankets and activation performance of the Flibe/V-alloy blankets were also investigated for the cases with and without external Be. The MHD coating of Er₂O₃ in the Li/V-alloy blankets introduced long-lived activation products. The activation of the Flibe/V-alloy blanket with external Be was comparable to that without external Be.

Copyright (c) 2007 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

Flibe blanket, Li blanket, vanadium alloy, Be multiplier, neutronics analysis, activation analysis

DOI: 10.1585/pfr.2.046

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This paper may be cited as follows:

Zaixin LI, Teruya TANAKA and Takeo MUROGA, Plasma Fusion Res. 2, 046 (2007).