By RT Wood; Oak Ridge National Laboratory. .; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information
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Additional resources for Advanced Reactor Licensing : Experience with Digital I&C Technology in Evolutionary Plants
The verification approach adopted provided evidence that the software design performed all functions specified and did not perform any unintended functions. The CNSC staff insisted that the group of verifiers must be independent of the group responsible for design and implementation of the software. For both SDS1 and SDS2, the licensee performed unit testing, software integration testing, validation testing, system integration testing, and reliability qualification. The CNSC staff followed and reviewed the testing activities and found that minor deviations from the system specification occurred during the first loop of the software cycle.
Thus, three layers of independent and diverse defense-in-depth exist at the system level. As with YGN Units 3 and 4 and Uljin Units 3 and 4, KINS required a backup panel at the component level. This panel is independent and diverse from the system-level backup and the DPCS, so there are two component-level layers of defense-in-depth. KINS required the installation of redundant microprocessors in each channel to increase the availability, testability, and reliability of the DPPS. As a result, two microprocessors are used for the bistable function and four microprocessors for the local coincidence logic function.
The NSSS protection signal processing and bistable circuitry were upgraded at Kori Nuclear Power Station Unit 1 using commercial-grade digital process instrumentation. Uljin Nuclear Power Station Units 3 and 4 employ microprocessors for plant control systems, including additional logic between system- and component-level circuits. These non-safety-related control systems are based on programmable logic controllers (PLCs). All of the protection systems, including the reactor trip system and engineered safety features actuation system (ESFAS), of Uljin Nuclear Power Station Units 5 and 6, are being built to use digital technologies, but the MCR and the remote shutdown panels are still based on conventional technologies.