分类： 物理学 >> 核物理学 提交时间： 2025-04-01
Xia, Dr. Sida
Zhu, Dr. Jian
Liu, Prof. Wenguan
yang, Mr. guo
Li, Dr. Wen-Jie
Sun, Miss Dan
Chen, Dr. Xue-Kun
WU, Dr. Xi Jun
摘要： As one of the candidate materials for reactors, uranium alloys face environmental challenges from neutron irradiation during operation. Metal uranium is prone to radiation defects upon irradiation. The addition of metal stabilizers to uranium alloys can enhance their adaptability to the irradiation environment. Among various stabilizers, molybdenum and niobium metals have been extensively studied due to their good solubility and compatibility with metal uranium. In this paper, molecular dynamics methods were employed to simulate the micro-irradiation defect evolution process in the U-Mo-Nb ternary alloy fuel. A potential function suitable for the U-Mo-Nb ternary alloy was trained using machine learning-based approaches. The simulation involves the irradiation cascade damage evolution process under different temperatures, various primary collision atom energies, and incident directions along different lattice vectors, analyzing the impact of different environmental factors on the defect extent of the U-Mo-Nb ternary alloy fuel. The results indicate that the maximum difference in the peak number of defects between the highest and lowest values, depending on the incidence angle, is 7.6%. Higher temperatures lead to a greater number of defect peaks, and fewer defects remain after annealing. The greater the energy of the primary collision atoms, the more defects are produced, and the longer it takes to reach the peak defect number. The number of defects generated in the uranium-molybdenum-niobium ternary alloy under irradiation at similar temperature conditions is approximately 25% that of uranium dioxide, with smaller void and interstitial cluster sizes. Under the impact of primary knock-on atoms with the same energy, the peak number of defects is about 50% of that in the uranium-molybdenum alloy, and the void cluster size is smaller. This indicates that the uranium-molybdenum-niobium ternary alloy has better radiation resistance than uranium-molybdenum alloys, uranium-niobium alloys, and other uranium alloys.
分类： 核科学技术 >> 辐射物理与技术 提交时间： 2025-02-10
摘要： actor.Additionally,by connecting the reactor to a foatingplatform,FNPPs offer the advantage of adaptable site selec-tion with fewer restrictions.These plants can explore in-dependentlyunder difficultconditions or canbepulledintosafe waters to avoid potential dangers.FNPPs have becomea prominentresearch topicinrecentyears[4,5].VariousFNPPreactors arebeing designed indifferentnations,suchas ACP100s and ACPR50s in China,OFNP-300/OFNP1100in the USA,Flexblue in France,and KLT-4Os.RITM-200VBER-300,ABV-6E,and SHELFinRussia(WNA,2020).mobility and deployment to accommodate various ma-rineconditionsandoperationalrequirements.Russia’s"Akademik Lomonosov"foating nuclear power station hasbeeneffectivelydeployed andoperated[6].Chinaiscurrentlydeveloping FNPPs by placing ACP100 reactors on barge-typeplatforms.Bargeplatforms[7]haveasignificantlyreducedstabilitycomparedtocolumn-stabilizedplatforms,tensionleg platforms,and other center-basedplatforms because oftheirnon-isotropicrotationalinertia,which affects theirper-formance in winds,waves,and currents.When exposed tocrosswindsandwaves,yawandswaycanleadtodangerouslateral movements, ranging from slight structural deforma-tions toputtingthereactor’ssafety atrisk[8].Variousloadssuch as tilting, rocking, swaying, and impact can affect theperformance of steam delivery systems in reactors. Duringnaturalcirculation,theseeffectsmayalsobe affectedby thepressure caused by variations in elevation and fluctuations[9].Jie[10]andYan[11]performedadvantageousevaluationsbyusingsystematicanalyticalprogramsfordistinctreactortypes or specialized circuits under rolling,heaving,and sway-ing circumstances. The FNPP was unable to maintain stableoperation under significant rolling and pitching movements.Strother[12]andLiuet al.[13]studied thedynamicresponseandmooringcharacteristicsofmulti-point-mooredcolumn-stabilized FNPPs.Few studies have examined the hydrody-namic response of barge-type FNPPs to waves. To evaluateandreduce therisks posed by wind andwaves,it is crucialto study the factors affecting barge-type FNPPs and their dy-namic reactions when exposed to wind, waves, and currents.
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