Document: NUREG-0800
Document ID: 1df526d9-2ae0-4da2-b936-2e24b038ca8c
Document Type: srp
Title: DIVERSE INSTRUMENTATION AND CONTROL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070650035.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.8
CFR Part: 
CFR Title: 

Content:
ssurance requirements of GDC 1 have been met. Based on the review of diverse I&C system status information, manual initiation capabilities, and provisions to support safe shutdown, the staff concludes that information is provided to monitor the system over the anticipated ranges for normal operation, for anticipated operational occurrences, and for accident conditions as appropriate to assure adequate safety. Appropriate controls are provided for manual initiation of diverse I&C functions. These manual controls are to be independent of the digital systems that provide automatic initiation of the same functions. The diverse I&C systems appropriately support actions to operate the nuclear power unit safely under normal conditions and to maintain it in a safe condition under accident conditions. Therefore, the staff finds that the design of the diverse I&C systems satisfies the requirements of GDC 13 and 19. Based on the licensee’s commitment to periodically test the diverse I&C systems from end-to-end [summarize the specific commitment], the staff concludes that an acceptable level of availability for the system can be maintained. 2. Note: The following finding applies to diverse I&C systems involving digital computer-based components. Based on the review of software development plans and the review of the computer software development process and design outputs, the staff concludes that the computer systems meet the guidance of Regulatory Guide 1.152, “Criteria for Digital Computers in Safety Systems of Nuclear Power Plants.” Therefore, the special characteristics of computer systems have been adequately addressed, and the staff finds that the diverse I&C systems satisfy the requirements of GDC 1. 3. Additional evaluation findings applicable to ATWS mitigation systems: The ATWS mitigation system instrumentation includes [summarize the basic functions and elements of the I&C system design submitted for review]. Based on the review of these functions and the