压水堆中涂层式MA-^(6)LiD嬗变靶的嬗变性能  

Transmutation Performance of Coated MA-^(6)LiD Transmutation Target in PWR

作　　者：叶滨[1] 费小丹[1] YE Bin;FEI Xiaodan(School of National Defense Science and Technology,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学国防科技学院,四川绵阳621010

出　　处：《西南科技大学学报》2021年第4期78-84,共7页Journal of Southwest University of Science and Technology

基　　金：国家自然科学基金青年科学基金项目(12005178)。

摘　　要：以177压水堆堆芯结构作为嬗变堆芯,设计适用于压水堆的涂层式嬗变靶。嬗变靶为棒状结构,内部为UO_(2),外部为次锕系核素(MA)与^(6)LiD的混合物,随后将嬗变棒装载在堆芯内部接受540 d照射,分析研究嬗变涂层材料的厚度及比例、嬗变棒对堆芯有效增殖系数(k_(eff))和中子能谱产生的影响、MA核素的嬗变率和裂变率。结果表明:当^(6)LiD与MA的质量比为2∶8时嬗变效果最优;当嬗变涂层厚度为0.01 cm时MA核素的嬗变率最高,为31.31%;嬗变涂层厚度为0.20 cm时MA核素的裂变率最高,为3.94%。该嬗变方式可有效提高MA核素在压水堆中的嬗变率及裂变率,且对堆芯中子能谱分布产生的影响较小。此研究结果可为压水堆嬗变MA核素的工程试验提供参考。Taking the 177 assembly PWR as the transmutation core,this paper designed a coated transmutation target suitable for PWR. The transmutation target is a rod structure with UO_(2) inside and a mixture of minor actinides( MA) and^(6)Li D outside. Then the transmutation rods were loaded in the core for 540 days. The thickness and proportion of transmutation coating material,the influence of transmutation rods on the effective multiplication coefficient( k_(eff)) and neutron spectrum,and the transmutation rate and fission rate of MA nuclide were analyzed and studied. The results show that when the ratio of6 Li D to MA is 2∶ 8,the transmutation effect is the best;when the thickness of transmutation coating is 0. 01 cm,the transmutation rate of MA nuclide is the highest,which is 31. 31%;when the thickness of transmutation coating is 0. 20 cm,the fission rate of MA nuclide is the highest,which is 3. 94%. The results prove that this transmutation method can effectively improve the transmutation rate and fission rate of MA nuclides in PWR,and has little effect on the neutron energy spectrum distribution in the core. The research results can provide an important reference for the engineering test of transmutation of MA nuclides in PWR.

关 键 词：压水堆 次锕系核素 嬗变靶 嬗变率 裂变率 

分 类 号：TL24[核科学技术—核燃料循环与材料]