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裂变气体核素γ射线效率刻度中的自吸收校正
蒙特卡罗方法 HPGe探测器 探测效率 自吸收校正
2010/3/31
针对裂变气体核素HPGe探测器效率刻度中的自吸收校正问题,本工作详细描述了源盒、探测器和源物质等计算中需要的参数,按照实际的几何布局建立了HPGe探测器效率的蒙特卡罗计算模型,并编制了相应计算程序。计算模型可靠性得到实验数据的验证,用该模型计算了裂变气体核素在不同源介质下的探测效率,得到了相应的自吸收校正因子。
Thermal-Hydraulic System Codes in Nulcear Reactor Safety and Qualification Procedures
Thermal-Hydraulic System Codes Nulcear Reactor
2009/9/3
In the last four decades, large efforts have been undertaken to provide reliable thermal-hydraulic system codes for the analyses of transients and accidents in nuclear power plants. Whereas the first ...
Reliability Assessment of 2400 MWth Gas-Cooled Fast Reactor Natural Circulation Decay Heat Removal in Pressurized Situations
2400 MWth Gas-Cooled Fast Reactor Natural Circulation
2009/9/3
As the 2400 MWth gas-cooled fast reactor concept makes use of passive safety features in combination with active safety systems, the question of natural circulation decay heat removal (NCDHR) re...
Buckling of Imperfect Thin Cylindrical Shell under Lateral Pressure
Lateral Pressure Cylindrical Shell
2009/9/3
The strength of thin shells, under external pressure, is highly dependent by the nature of imperfection. This paper investigates buckling behaviour of imperfect thin cylindrical shells with analytical...
Machine Learning of the Reactor Core Loading Pattern Critical Parameters
the Reactor Core Critical Parameters
2009/9/3
The usual approach to loading pattern optimization involves high degree of engineering judgment, a set of heuristic rules, an optimization algorithm, and a computer code used for evaluating proposed l...
CFD Simulation of Polydispersed Bubbly Two-Phase Flow around an Obstacle
CFD Polydispersed Bubbly
2009/9/3
This paper concerns the model of a polydispersed bubble population in the frame of an ensemble averaged two-phase flow formulation. The ability of the moment density approach to represent bubble popul...
CFD Analysis of a Slug Mixing Experiment Conducted on a VVER-1000 Model
CFD VVER-1000 Model
2009/9/3
A commercial CFD code was applied, for validation purposes, to the simulation of a slug mixing experiment carried out at OKB “Gidropress” scaled facility in the framework of EC TACIS project R2.02/02:...
Modelling of HTR Confinement Behaviour during Accidents Involving Breach of the Helium Pressure Boundary
HTR Helium
2009/9/2
Development of HTRs requires the performance of a thorough safety study, which includes accident analyses. Confinement building performance is a key element of the system since the behaviour of aeroso...
全体积R7T7型参考玻璃固化体裂隙初步研究
玻璃固化体 腐蚀 体视学方法 裂隙
2009/8/5
为从微观角度研究裂隙对玻璃固化体腐蚀影响,引入体视学方法对玻璃体裂隙进行了裂隙分布、腐蚀程度等初步研究。采用扫描电镜对结束1147d静态浸出实验后的全体积R7T7型参考玻璃的部分样品进行分析。根据分析得到的二维参数,通过体视学方法计算得到全体积玻璃体的裂隙率FR为41±13,腐蚀量为(3.88±1.20)×10-4m3,约占玻璃体参与水相腐蚀反应总体积的(0.28±0.09)%。分析还发现,裂隙腐...
砷化物浸泡人发中As的滞留行为和分布的仪器中子活化分析
中子活化分析 中子活化分析 砷 人发
2009/7/27
采用仪器中子活化分析法对砷化物溶液浸泡人发后人发中的砷含量及未经砷化物溶液浸泡的人发中的固有砷含量进行了定量分析。分析结果显示,经砷化物溶液浸泡后,每段头发中均含有砷,且在浸泡处出现砷含量峰值,与未经浸泡的人发的分析结果对比,说明砷化物可通过吸附渗透到人发中。为检验分析数据的可靠性,同时对3种质控样品进行分析,测定值与认证值在不确定度范围内一致。
阐述了射线半影编码成像系统点扩散函数锐度展宽与一般系统点扩散函数半高宽的区别与联系,确立了半影编码成像系统锐度展宽概念,建立了半影编码孔成像系统蒙特卡罗模型。计算获得了0.662、1.25、2.45、5.0、10.0、14.06MeV等一系列能量点的γ射线与中子在半影编码成像系统点扩散函数,并按照定义算出γ射线与中子各能量系统点扩散函数的锐度展宽;得到γ射线和中子能量与半影编码成像系统锐度展宽函数...
绕制预应力对MICE超导耦合磁体冷质量应力状态的影响
MICE超导螺线管磁体 超导螺线管磁体 预应力 有限元 应力分析
2009/5/23
超导耦合螺线管磁体为μ介子离子化冷却实验装置(MICE)中的关键设备,其线圈内径1500mm,长度285mm,采用截面1.65mm×1.00mm的NbTi复合超导线,励磁到210A时,峰值磁场可达7.4T。在降温和励磁过程中,为减小导线窜动而导致失超,线圈绕制过程中需对导线和紧固带施加预应力。本文根据组合筒理论,得出了绕制过程中线圈和紧固带的预应力与冷质量内部应力分量的关系。采用有限元方法对线圈绕...