Update of Safety Analysis Results
ARIES Electronic Project Meeting
December 4, 1998
Tokamak Dust Analysis (Divertor)
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Vaporization Analysis
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Early Dose
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- Tokamak dust (particles smaller than 100 mm in diameter) is produced by the vaporization of divertor surface material and accumulated during previous plasma disruptions
- Dust could be mobilized during an accident or during in-vessel maintenance
- Assuming an interaction surface area of 15 m2, the total amount of tungsten vaporized an melted during a disruption are 1.16 and 60.8 kg, respectively
- 100% of the vaporized tungsten and 10% of the melted tungsten (melt layer splash) are assumed to form dust resulting in the total production of 7.24 kg of tungsten per full-power disruption
- Because of the narrow V-shape (closed) of the divertor, the radiation energy (photons) from the vapor cloud (the vapor shielding area) will be deposited on near surface area causing significantly higher additional erosion
- Taking the vapor cloud effect into account could increase the amount of dust generated by as much as an order of magnitude