DARWIN/PEPIN2 is a French inventory code that has been developped at CEA since the mid-1990s for fuel fission reactor, material neutron activation and material radioactive decay calculations. It takes into account both R&D and industrial application requirements. Today, DARWIN/PEPIN2.4.x is the last major release and deals with nuclear data uncertainties propagation to some quantities of interest outputs as atom density, activity and decay heat. The purpose of this paper is to outline this last capability. Methodology approach, calculation hypotheses and nuclear data uncertainty used are discussed as well as the computational implementation. The last part of this paper shows two illustrative uncertainty calculations related to fission pulse and PWR-${\mathrm{UO}}_2$ fuel depletion configurations.

DARWIN/PEPIN2 是法国的清单代码，自 1990 年代中期以来，CEA 就开发了用于燃料裂变反应堆、材料中子活化和材料放射性衰变计算的清单代码。它兼顾了研发和工业应用需求。今天，DARWIN/PEPIN2.4.x 是最后一个主要版本，它处理核数据不确定性传播到一些感兴趣的输出量，如原子密度、活动和衰变热。本文的目的是概述最后一项功能。讨论了使用的方法论方法、计算假设和核数据不确定性以及计算实现。本文的最后一部分显示了与裂变脉冲和 PWR-${\mathrm{奥}}_2$ 燃料消耗配置。