Software appraisal is one of the important aspects of equipment appraisal in nuclear power plant, especially, how to treat and handle the application and appraisal for embedded software of safety level equipment is a new important task in construction and operation of nuclear power plants. The software appraisal for embedded software of safety level equipment is researched. Functional classification and system grading of the safety level system and equipment are the premise and foundation of software appraisal. The reason of requesting software appraisal for the systems based on computer is the defect of software belongs to the system defect, it may lead to common cause failures. Basic idea of various technical routes implementing software appraisal is interlinked, while in comparatively speaking, the technical route of IEC is most operable and highest acceptable, and most widely used.%软件鉴定是核电厂设备鉴定的一个重要方面,尤其是如何看待和处理安全级设备中嵌入式软件的应用和鉴定是核电厂建设和运营过程中一项重要的新课题。对核电厂安全级设备嵌入式软件鉴定进行了研究。安全级系统和设备的功能分类与系统分级是软件鉴定的前提和基础。基于计算机的系统需要,进行软件鉴定的原因是软件缺陷属于系统缺陷,因而可能引发共因故障。软件鉴定各技术路线对嵌入式软件鉴定的基本思路是相通的,相比较而言,IEC技术路线操作性最强,认可度最高,应用也最广泛。
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