摘要
热管堆KRUSTY的热膨胀负反馈模拟一直是业内计算的难点。本文基于蒙特卡罗方法(MCNP)的非结构网格功能,将KRUSTY非结构网格的功率分布直接输入给有限元软件ABAQUS,利用ABAQUS进行KRUSTY的热力耦合,在统一的非结构网格下研究了KRUSTY热变形模拟、膨胀反应性反馈和密度反馈,重点研究了非均匀密度与均匀密度的差异。结果表明,热膨胀效应带来超过900pcm(pcm=10^(−5))的负反馈,特殊的燃料变形主要发生在上部和外边缘表面,总位移达到~0.9 cm,反应堆堆芯总温差足够小,只有23 K左右,并且核热力耦合较核热耦合趋于使堆芯的温度分布更均匀,由于热管的冗余设计,反应堆的设计可以满足单点失效原则。相较于传统的组合实体(CSG)几何,本文基于非结构网格MCNP方法可以更真实地模拟金属燃料堆的热膨胀效应。
Thermal expansion negative feedback simulation of heat pipe reactor KRUSTY has always been a difficulty in calculation.Based on the unstructured mesh ablility of MCNP,the power distribution of KRUSTY unstructured mesh is directly input to ABAQUS,and the thermal mechanical coupling of KRUSTY is carried out by ABAQUS.The thermal deformation simulation,expansion reactivity feedback and density feedback of KRUSTY are studied under the unified unstructured mesh.The difference between non-uniform density and uniform density is studied.The results show that the thermal expansion effect brings more than 900pcm(pcm=10^(-5))negative feedback,and the special fuel deformation mainly occurs on the upper and outer edge surface,with a total displacement of about 0.9 cm.The total temperature difference of reactor core is small enough,only about 23 K.Moreover,the neutronics-thermo-mechanics coupling tends to make the core temperature distribution more uniform,and the reactor design can satisfy the single-point failure principle due to the redundant design of the heat pipe.Compared with the traditional CSG geometry,the unstructured-mesh Monte Carlo method can better simulate the thermal expansion effect of metal fuel reactor.
作者
王立鹏
曹璐
陈森
张信一
姜夺玉
胡田亮
李达
陈立新
江新标
Wang Lipeng;Cao Lu;Chen Sen;Zhang Xinyi;Jiang Duoyu;Hu Tianliang;Li Da;Chen Lixin;Jiang Xinbiao(Northwest Institute of Nuclear Technology,Xi’an,710024,China)
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2023年第6期45-53,共9页
Nuclear Power Engineering
基金
自然科学基金(12275219,12205237)。
