Document: NUREG-0800
Document ID: f2ddec6c-0cce-4223-b813-233678ee07d0
Document Type: srp
Title: DIVERSE INSTRUMENTATION AND CONTROL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159B171.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.8
CFR Part: 
CFR Title: 

Content:
ely 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 General Design Criteria 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. 7.8-10 Draft Revision 6 – August 2015 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 RG 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 design bases submitted by the applicant, the staff concludes that the ATWS mitigation design includes an appropriate set of functions. Based on review of the interfaces of the ATWS mitigation system and equipment with the RTS, the staff concludes that the separation and independence design features of the RTS are not compromised by the ATWS mitigation system design. Where isolation devices are provided in the RTS to support ATWS mitigation interfaces, the isolation devices are applied and qualified to the guidelines of SRP BTP 7-11. Based on the above items, the staff concludes that the design of the