Document: NUREG-0800
Document ID: 6f2ffbec-a876-42d7-a247-d27c02ea9b4a
Document Type: srp
Title: DIVERSE INSTRUMENTATION AND CONTROL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1602/ML16020A096.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.8
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CFR Title: 

Content:
erations that should be emphasized in the review of the diverse I&C systems are identified below. • Design basis - Design bases should be described in the SAR for each diverse I&C system. The design bases should, as a minimum, address the following topics: - The specific design requirements identified in 10 CFR 50.62, as applicable, and any other applicable design requirements. - Identification of conditions that require protective action by the diverse I&C systems. For DAS, these events are identified in the applicant or licensee’s D3 analysis. For ATWS mitigation systems, these events are limited to anticipated operational occurrences, defined in 10 CFR Part 50, Appendix A, as conditions of normal operation that are expected to occur one or more times during the life of the nuclear power unit, and include but are not limited to loss of power to all recirculation pumps, tripping of the turbine generator, isolation of the main condenser, and loss of all offsite power. - Identification by the applicant or licensee of the bounding events and the bases in the analyses that are presented or referenced in SAR 7.8-7 Revision 6 – August 2016 Chapter 15. The reviewer should confirm with the organization responsible for the review of reactor systems that the analytical basis for each diverse I&C system is acceptable and consistent with the Chapter 15 analysis, and should confirm with the organizations responsible for the review of reactor systems and plant systems that the design of the mechanical systems used for ATWS mitigation is acceptable. - Identification of the range of transient and steady-state conditions for both the energy supply and the environment during normal, abnormal, and accident conditions under which the system must perform. - Identification of performance requirements. The performance requirements for which credit is taken in the mitigation of design basis events (e.g., dynamic response, accuracy) should be identified. The review should confirm