为了完成高通量工程试验堆(HFETR)运行许可证延续(OLE)申请的安全论证,需要提供一份完整的时限老化分析(TLAA)清单,并通过计算或分析论证各项TLAA在延续运行期内是否满足安全运行的要求。基于美国压水堆核电厂TLAA的经验,采用“材料-环...为了完成高通量工程试验堆(HFETR)运行许可证延续(OLE)申请的安全论证,需要提供一份完整的时限老化分析(TLAA)清单,并通过计算或分析论证各项TLAA在延续运行期内是否满足安全运行的要求。基于美国压水堆核电厂TLAA的经验,采用“材料-环境-影响因素”分析法筛选出通用TLAA和潜在TLAA项目,同时识别出HFETR特定的TLAA项目,获得HFETR需要补充或重新计算分析的9项TLAA清单。通过每一项TLAA的评估结果表明,在10 a OLE内能够保证HFETR的安全性。展开更多
Integral method is employed in this paper to alleviate the error accumulation of differential equation discretization about time variant t in Time Domain Finite Element Method (TDFEM) for electromagnetic simulation. T...Integral method is employed in this paper to alleviate the error accumulation of differential equation discretization about time variant t in Time Domain Finite Element Method (TDFEM) for electromagnetic simulation. The error growth and the stability condition of the presented method and classical central difference scheme are analyzed. The electromagnetic responses of 2D lossless cavities are investigated with TDFEM; high accuracy is validated with numerical results presented.展开更多
Line heating process is a very complex phenomenon as a variety of factors affects the amount of residual deformations. Numerical thermal and mechanical analysis of line heating for prediction of residual deformation i...Line heating process is a very complex phenomenon as a variety of factors affects the amount of residual deformations. Numerical thermal and mechanical analysis of line heating for prediction of residual deformation is time consuming. In the present work dimensional analysis has been presented to obtain a new relationship between input parameters and resulting residual deformations during line heating process. The temperature distribution and residual deformations for 6 mm, 8 mm, 10 mm and 12 mm thick steel plates were numerically estimated and compared with experimental and published results. Extensive data generated through a validated FE model were used to find co-relationship between the input parameters and the resulting residual deformation by multiple regression analysis. The results obtained from the deformation equations developed in this work compared well with those of the FE analysis with a drop in the computation time in the order of 100 (computational time required for FE analysis is around 7 200 second to 9 000 seconds and where the time required for getting the residual deformation by developed equations is only 60 to 90 seconds).展开更多
According to heat transfer principle and the process of solving engineering problems by finite element method, examples were given to demonstrate how finite element analysis can be used to describe transient heat tran...According to heat transfer principle and the process of solving engineering problems by finite element method, examples were given to demonstrate how finite element analysis can be used to describe transient heat transfer through fabrics. Details were given to describe how conduction and convection affect temperature distribution and heat loss during heat transfer processes by taking advantage of the quick calculation of FEA software MSC.Marc. Experimental results show good agreement with the theoretical results.展开更多
文摘为了完成高通量工程试验堆(HFETR)运行许可证延续(OLE)申请的安全论证,需要提供一份完整的时限老化分析(TLAA)清单,并通过计算或分析论证各项TLAA在延续运行期内是否满足安全运行的要求。基于美国压水堆核电厂TLAA的经验,采用“材料-环境-影响因素”分析法筛选出通用TLAA和潜在TLAA项目,同时识别出HFETR特定的TLAA项目,获得HFETR需要补充或重新计算分析的9项TLAA清单。通过每一项TLAA的评估结果表明,在10 a OLE内能够保证HFETR的安全性。
基金the National Natural Science Foundation of China (No.60601024).
文摘Integral method is employed in this paper to alleviate the error accumulation of differential equation discretization about time variant t in Time Domain Finite Element Method (TDFEM) for electromagnetic simulation. The error growth and the stability condition of the presented method and classical central difference scheme are analyzed. The electromagnetic responses of 2D lossless cavities are investigated with TDFEM; high accuracy is validated with numerical results presented.
文摘Line heating process is a very complex phenomenon as a variety of factors affects the amount of residual deformations. Numerical thermal and mechanical analysis of line heating for prediction of residual deformation is time consuming. In the present work dimensional analysis has been presented to obtain a new relationship between input parameters and resulting residual deformations during line heating process. The temperature distribution and residual deformations for 6 mm, 8 mm, 10 mm and 12 mm thick steel plates were numerically estimated and compared with experimental and published results. Extensive data generated through a validated FE model were used to find co-relationship between the input parameters and the resulting residual deformation by multiple regression analysis. The results obtained from the deformation equations developed in this work compared well with those of the FE analysis with a drop in the computation time in the order of 100 (computational time required for FE analysis is around 7 200 second to 9 000 seconds and where the time required for getting the residual deformation by developed equations is only 60 to 90 seconds).
文摘According to heat transfer principle and the process of solving engineering problems by finite element method, examples were given to demonstrate how finite element analysis can be used to describe transient heat transfer through fabrics. Details were given to describe how conduction and convection affect temperature distribution and heat loss during heat transfer processes by taking advantage of the quick calculation of FEA software MSC.Marc. Experimental results show good agreement with the theoretical results.
