PLUTONIUM ROCK-LIKE OXIDE FUEL (ROXF) SYSTEM, THEIR ONCE-THROUGH BURNING AND USAGE
The ROXf is a kind of inert matrix fuel U-238-free matrices,it has a high plutonium transmutation capability. The ROXf consists of chemically stable phases of fluorite ‘stabilized ZrO2 or ThO2, and spinel MgAl2O4. In this fuel, PuO2 is solidified in a fluorite phase. With U-238-Free matrices, a large part of the plutonium can be burned after irradiation in conventional LWRs. The spent ROXf consists of natural analogous geologically stable phases , and is disposed directly as high level wastes ‘HLWs’ after about 50 years cooling. From the high plutonium burn up rate and the high stability of the fuel, the ROXf-LWRs system has proliferation resistance and environmental safety. Characteristics of two types of ROXf , Zr-ROX and Th -ROX with weapons-Pu ,in an LWR core arrangement are evaluated by cell burn up calculations and 2-D core calculations using the SRAC code system and JENDL-3 nuclear library. In an LWR of moderator to fuel volume ratio=1.9 , which corresponds to current PWRs , Pu transmutation rates with the two types of ROXf are large enough and more than 80% and 99% of Pu and Pu-239 , respectively, can be burned. The calculated kinetic parameters indicate less moderate characteristics of ROX cores, especially with Zr-ROX.The fertile Th-232 in Th-ROX works like U-238 in the UO2 fuel ,making kinetic parameters more moderate and reactivity drop due to burn up smaller than that Zr-ROX. The neutron capture of Th-232 to generate U-233 , causes the safeguards problem. Thus , the characteristics of Zr-ROX as a typical example , were investigated in this study.
Ashraf elsayed Mohamed Mohamed
Brno University of Technology Alexandria, Egypt
国际会议
18th International Conference on Nuclear Engineering(第18届国际核能工程大会 ICONE 18)
西安
英文
1-3
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）