本标准规定了用于支持先进非轻水堆（非轻水堆）核电厂（NPP）风险决策的概率风险评估（PRA）要求，并规定了将这些要求应用于特定应用的方法。支持将本标准应用于PRA，用于各种反应堆设计，如模块化高温气冷反应堆（MHTGR）、液态金属冷却快堆（LMR）、熔盐反应堆（MSR）、微型反应堆- 基于非轻水堆技术的反应堆和小型模块化反应堆，以及其他先进的非轻水堆，本标准中的要求是在反应堆技术的基础上制定的。本标准取代了ASME/ANS RAS-1.4-2013[1-1]2的早期试用版本，并纳入了使用该版本的试点研究的反馈。

This Standard states the requirements for probabilistic risk assessments (PRAs) used to support risk-informed decisions for advanced non-light water reactor (non-LWR) nuclear power plants (NPPs) and prescribes a method for applying these requirements for specific applications. To support the application of this Standard to PRAs for a diverse set of reactor designs such as modular high-temperature gas-cooled reactors (MHTGRs), liquid metal-cooled fast reactors (LMRs), molten salt reactors (MSRs), micro-reactors and small modular reactors based on non-LWR technology, and other advanced non-LWRs, the requirements in this Standard were developed on a reactor-technology-inclusive basis. This Standard supersedes an earlier trial use version ASME/ANS RAS- 1.4-2013 [1-1]2and incorporates feedback from pilot studies using that version.