Modernizing the Regulatory Infrastructure for Digital I&C

Operating reactors in the U.S. want to efficiently integrate and implement digital upgrades into plant systems to address obsolescence issues with instrumentation and control (I&C) components, overall plant reliability, and other factors. In addition, new reactor designs continue to employ highly integrated digital I&C designs for safe and efficient operation of future plants. Over the past several years, the NRC, in collaboration with stakeholders, extensively modernized its regulatory infrastructure associated with digital I&C. As a result, licensees are making digital I&C upgrades under 10 CFR 50.59 and have begun making more extensive upgrades that require license amendments.

I&C Regulatory Infrastructure Mapping

The NRC staff developed a detailed I&C regulatory infrastructure mapping presentation to assist with the identification of applicable regulations, guidance, and standards for various I&C technical areas.

Recent Policy and Guidance Updates

• SRM-SECY-22-0076 "Expansion of Current Policy on Potential Common-Cause Failures in Digital Instrumentation and Control Systems"
• RG 1.250, Revision 0, "Dedication of Commercial-Grade Digital I&C Items for Use in Nuclear power Plants"
• DG-1374 (RG 1.152, Revision. 4), "Criteria for Use of Computers in Safety Systems of Nuclear Power Plants"