Transient dynamical–thermoelastic–optical system simulation is an important expansion of classical ray tracing through rigid, resting lenses because the operating performance of high-precision optical systems can be influenced by dynamical excitations or thermal gradients. In this paper an approach for an integrated optical system simulation using the coupling of elastic multibody system simulations, thermoelastic finite element analysis and gradient-index ray tracing is presented. Transient mechanical rigid body motions and elastic deformations, thermally induced refraction index changes, and thermal elastic deformations can be considered simultaneously in the ray tracing using the presented method. The calculation of the dynamical and thermal disturbances, the data transfer and coupling, and the gradient index ray tracing method are introduced. Finally, the approach is applied on a transient triplet lens optical system and some investigation results are shown.

核临界安全分析是保证乏燃料后处理厂安全性的关键技术，而现有核临界安全事故分析程序中，或在几何适用范围上受限，或由于计算效率低而工程实用性差。因此，亟需研发一套适用范围大、计算精度高的临界安全分析方法，提高对核临界事故的分析精度，为乏燃料后处理厂提供技术保障。为此，本文针对乏燃料溶液系统特性，基于零维超细群截面制作与全问题并群方法、预估-校正准静态中子动力学计算方法和二维轴对称热工-辐解气体模型，开发了相应的计算程序模块，最终形成了一套具备并行功能的三维乏燃料溶液系统临界安全分析程序hydra-TD。进一步利用该程序对法国SILENE实验装置进行了验证，结果显示：第一裂变功率峰、倍增时间、总裂变次数等关键参数的误差较小，证明hydra-TD程序正确模拟了燃料溶液系统临界过程中的多物理过程，具备临界安全分析的能力。