MDEP Generic Common Position No DICWG-12. Common position on the use of automatic testing in digital I and C systems as part of surveillance testing

Digital I and C systems, that have the capability to use automatic tests to reveal and manage faults, may use these capabilities to support surveillance testing. Automatic tests may provide early detection of potential system failures and can address aspects of surveillance testing, and thus they may reduce the need for manually performed surveillance activities (e.g., continuously monitor system behaviour during operation to alarm operators to take appropriate actions). This common position applies to the use of such automatic tests after system deployment. The Digital Instrumentation and Controls Working Group (DICWG) has agreed that a common position on this topic is warranted given the increase of use of Digital I and C in new reactor designs, its safety implications, and the need to develop a common understanding from the perspectives of regulatory authorities. This action follows the DICWG examination of the regulatory requirements of the participating members and of relevant industry standards and IAEA documents. The DICWG proposes a common position based on its recent experience with the new reactor application reviews and operating plant issues