NDLI: Laser-Pulse Melting of Nuclear Refractory Ceramics

Content Provider	Springer Nature Link
Author	Ronchi, C. Sheindlin, M.
Copyright Year	2002
Abstract	An accurate method for melting-point measurement of refractory nuclear ceramics was developed, based on laser-pulse heating and thermal arrest detection. The temperature measurement is performed by a combined use of a brightness pyrometer and a high-speed spectrometer working in the range of 500 to 900 nm. This method provides both the true temperature and the spectral emissivity function of the examined materials. Pure sintered MgO and a Mg:Am mixed oxide were first measured. The resulting melting point of the former (2350±20 K) is significantly higher than that commonly recommended and decreases with the addition of americium. Furthermore, UO$_{2}$ irradiated to 37,000 MWd/t and submitted to a reactor loss-of-coolant test was investigated: the melting point decreases from 3120 K, in the as-fabricated state, to 2950 K. Both fresh Zr:U mixed oxides and “corium” lava from a reactor meltdown experiment were also investigated.
Starting Page	293
Ending Page	305
Page Count	13
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	23
Issue Number	1
e-ISSN	15729567
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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