Surveillance and maintenance SM

ISSUE TITLE Adequacy of non-destructive inspections and testing (SM 1) (WWER) 

Design of ultrasonic and eddy current inspection equipment for SG and primary circuit, and design of visual and TV equipment inspection facilities were proposed for the Kozloduy NPP Units 5 and 6. 

The development of NDT qualification requirements has been requested by the regulatory bodies. Russian Federation, Ukraine 

Safety functions can be impaired if equipment outages are not carefully controlled. 

The NRC issued a letter in 1994 to the nuclear industry reemphasizing NRC guidance on voluntary online maintenance. Specifically, the letter stated that l)the practice should represent a net safety benefit and be warranted by operational necessity, not by convenience, 2) the practice should not be abused by repeated entry into and exit from the limited condition of operation, 3) the removal from service of safety systems and important non-safety equipment should be minimized, 4) Any component testing or maintenance that increases the likelihood of a plant transient should be avoided plant operation should be stable, and 5) Configuration control and system/train unavailability must be effectively managed to minimize risk during maintenance activities. 

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