This article focuses on the nuclear plant safety I&C system Verification and Validation (referred to as V&V) which are through whole life cycle. This paper discusses three issues: the domestic and foreign regulatory standards involved in the Verification and Validation process, requirements in the review process and how suppliers meet their requirements in the practice. The Verification and Verification process of the safety-level instrument and control system adopts the two-step method, namely platform software and application software. V&V activities are carried out by suppliers using review and evaluation, special analysis and software testing. During the review, the focus was on what measures were taken to ensure the independence of the Verification and Validation process, software integrity-level and required Verification and Validation activities to cover the entire life cycle of the software.

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