Abstract The Advanced Direct 1-Step (AdD1S) is one of the most validated tools for the evaluation of Shutdown Dose Rate in complex fusion tokamak machines. The present work is built on the experience in analyzing tokamaks using prior versions of the code, where the activation analysis was limited to the first-step reactions. In the light of the neutron irradiation scenarios foreseen for fusion power reactors and the increasing importance of safety requirements, the possibility to treat the multi-step reactions introduced in the present version represents a novel and relevant development in the field. Moreover, a new Python library, PyD1S, has been developed to optimize the MCNP-FISPACT interface and data analysis. In this paper, the recent developments and the first applications are presented.

中文翻译：

---

用于三维停堆剂量率计算的高级 D1S 动态代码开发进展

摘要 Advanced Direct 1-Step (AdD1S) 是最有效的工具之一，用于评估复杂聚变托卡马克机器的关闭剂量率。目前的工作建立在使用代码的先前版本分析托卡马克的经验之上，其中激活分析仅限于第一步反应。鉴于聚变动力反应堆预见的中子辐照场景以及安全要求日益重要，当前版本中引入的处理多步反应的可能性代表了该领域的一个新的和相关的发展。此外，还开发了一个新的 Python 库 PyD1S 来优化 MCNP-FISPACT 接口和数据分析。在本文中，介绍了最近的发展和最初的应用。