Operability and Functionality Qualification

If plant systems, structures, or components (SSCs) are found to be degraded, nonconforming, or subject to an unanalyzed condition during operation, an evaluation of their functionality or operability may be necessary to demonstrate the capability of the nuclear power generating station to continue operating safely. This evaluation establishes the ability of the SSCs to perform their assigned safety functions. This chapter discusses the methodology and acceptance criteria applicable to this evaluation. It describes typical SSCs that may require operability evaluations and also provides definitions related to operability. Examples of the operating conditions and events to consider are described, as are the evaluation methods and acceptance criteria for short- and long-term operability.