IEC TR 63335:2021确定了一些对轻水小型模块化反应堆（SMR）特别重要的问题，这些问题目前没有得到现有IEC SC 45A标准的充分解决，在修订现有出版物时可以考虑这些问题，或者可能是新工作项提案的目标。每个SC 45A工作组将决定是否真的解决这些问题，如果真的解决了，将在哪个出版物中发布。尽管有许多高级第四代SMR项目正在进行中，但本文件并未涵盖其具体需求。

IEC TR 63335:2021 identifies a number of issues of particular importance to light water Small Modular Reactors (SMRs), which are not currently adequately addressed by existing IEC SC 45A standards, and that could be considered when revising existing publications or that could be the object of new work item proposals. Whether each of these issues will indeed be addressed, and if so in which publication, will be the decision of each SC 45A working group. Though there are a number of advanced Generation IV SMR projects underway, their specific needs are not covered by this document.