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:
systems, these events are limited to anticipated operational occurrences, defined in 10 CFR Part 50, Appendix A, “Definitions and Explanations,” 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 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. 7.8-7 Draft Revision 6 – August 2015 - 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 that the applicant or licensee verifies conformance to these requirements by validation testing and surveillance. • Quality of components and modules - Generic Letter (GL) 85-06, “Quality Assurance Guidance for ATWS Equipment that is not Safety-Related,” provides acceptable guidance for the quality assurance of diverse I&C systems and components. • System testing and surveillance - The applicant or licensee should identify the test, maintenance, surveillance, and calibration procedures. These provisions should be consistent