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Prevention of hydrogen and dust explosion in ITER文档
Fusion Engineering and Design 81 (2006) 1313–1319
Prevention of hydrogen and dust explosion in ITER
V. Chuyanov ∗, L. Topilski
ITER International Team, ITER Garching Joint Work Site, Boltzmannstr 2, 85748 Garching, Germany
Received 4 February 2005; received in revised form 17 May 2005; accepted 17 May 2005
Available online 20 December 2005
Abstract
It is to be expected that, over time, an interaction of plasma with walls and the divertor will create in ITER hundreds of
kilograms of beryllium, carbon or tungsten dust – loose particles with characteristic diameter <100 m. Interaction of the hot
Be dust with water in the case of a water leak will produce hydrogen. In such conditions air leaks can lead to hydrogen or dust
explosions. The explosions could damage the machine and would present a danger to the public if the release of radioactivity
from the vacuum vessel were not otherwise mitigated. Current ITER strategy to cope with the danger of dust/hydrogen explosions
is based on administrative limits on accumulation of dust inside the ITER vacuum vessel.
We are investigating a different approach based on active prevention measures – injections of an inert gas (CO2 ) in the vacuum
vessel in case of detection of air leaks.
Analysis done with the code MELCOR shows that injection of CO2 in the vacuum vessel may prevent the explosions. However,
a detailed analysis of O2/CO2/H2 space distributions and some experiments will be needed before a decision is made to base
ITER safety on this approach.
© 2005 Elsevier B.V. All rights reserved.
Keywords: ITER; Safety; Dust; Hydrogen; Explosions; Mitigation
1. Introduction with walls and the divertor will create in ITER hun-
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