Bridging lower length-scale calculations with the engineering-scale simulations of fuel performance codes requires the development of dedicated intermediate-scale codes. In this work, we present SCIANTIX, an open source 0D stand-alone computer code designed to be included/coupled as a module in existing fuel performance codes. The models currently available in SCIANTIX cover intra- and inter-granular inert gas behaviour in UO₂, and high burnup structure formation as well. Showcases of validation in both constant and transient conditions are presented in this work. As for the numerical treatment of the model equations, SCIANTIX is developed with full numerical consistency and entirely verified with the method of manufactured solutions – verification of different numerical solvers is also showcased in this work.

将较低的长度尺度计算与燃料性能代码的工程尺度模拟相结合需要开发专用的中间尺度代码。在这项工作中，我们介绍了SCIANTIX，这是一个开放源代码的0D独立计算机代码，旨在作为模块包含/耦合到现有燃油性能代码中。当前在SCIANTIX中可用的模型涵盖了UO _2中的颗粒内和颗粒间惰性气体行为，以及高燃耗结构形成。这项工作展示了在恒定和瞬态条件下的验证实例。至于模型方程的数值处理，SCIANTIX的开发具有完全的数值一致性，并已通过制造解决方案的方法进行了全面验证-在此工作中还展示了对不同数值求解器的验证。