Neutronic study of UO2-BeO fuel with various claddings

被引：20
作者：
Chen, Shengli [1 ,2 ]
Yuan, Cenxi [1 ]
机构：
[1] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Guangdong, Peoples R China
[2] CEA, DEN DER SPRC LEPh, F-13108 St Paul Les Durance, France
来源：
NUCLEAR MATERIALS AND ENERGY | 2020年 / 22卷
基金：
中国国家自然科学基金;
关键词：
UO2-BeO; Accident tolerant fuel; Fuel enrichment; Gas production; Power distribution; Isotopic concentration; THERMAL-CONDUCTIVITY; PERFORMANCE;
D O I：
10.1016/j.nme.2020.100728
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
The neutronic properties of UO2-BeO fuel with various claddings are investigated through the Monte Carlo method and the Linear Reactivity Model. A second order polynomial function is suggested to describe the relationship between the difference of the reactivity at the End of Cycle and two factors, the uranium enrichment and the volume fraction of BeO in the UO2-BeO fuel. The uranium enrichment is determined to ensure the same cycle length for each BeO fraction with zircaloy, FeCrAl, and SiC claddings. Similar neutronic properties are observed between the zircaloy and SiC claddings for a given BeO fraction, including the infinite multiplication factor, the gas release, the power distribution, and the isotopic concentrations. An important feature of UO2-BeO fuel is the production of He-4 , which is significant compared with current UO2 fuel. Lower production rates of xenon and krypton are found in the case of the UO2-BeO-FeCrAl fuel-cladding system, while those in the UO2BeO-zircaloy and UO2-BeO-SiC systems are quite similar to the current UO2-zircaloy system. The power distribution in an assembly and in a fuel pellet is flatter for a higher BeO fraction with the same cladding. Higher peak power is found in fuel assemblies with FeCrAl compared to the other two claddings, while the radial power distribution is quite similar for the three claddings.
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页数：10
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