The Effect of O/M ratio on the melting of plutonium and uranium mixed oxides

Kato, Masato ; Morimoto, Kyoichi ; Sugata, Hiromasa*; Konashi, Kenji*; Kashimura, Motoaki; Abe, Tomoyuki

Melting point of a nuclear fuel is one of the important physical properties for its development, because it limits maximum temperature of the fuel during operation. A rhenium inner capsule was used to prevent the reaction with capsule for measuring melting points of MOX. In this work melting points of MOX with 40% and 46%Pu were investigated as a function of an O/M ratio using Re inner, and the effect of the O/M ratio on the melting points was evaluated. The solidus and liquidus temperatures in (Pu $_{0.4}$ U $_{0.6}$ )O $_{2-x}$ and (Pu $_{0.46}$ U $_{0.56}$ )O $_{2-x}$ were measured by thermal arrest method. It was observed that the melting points in the both samples increased with a decrease of the O/M from 2.00, and their data were 50-100K higher than existing data measured in previous works which were measured with W capsule.

Language	:	English
Journal	:	Transactions of the American Nuclear Society
Volume	:	96
Number	:	1
Pages	:	p.193 - 194
Publication Year/Month	:	2007/06
Meeting title	:	American Nuclear Society 2007 Annual Meeting
Held date	:	2007/06
Location (city)	:	Boston
Location (country)	:	U.S.A.
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Keywords	:	no keyword
Research Facility	:	プルトニウム燃料製造施設
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Registration No. : BB20062893
JAEA Abstracts No. : 35001384
Paper Submission No. : 2975

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