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:
ormance 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 with the guidance of Generic Letter 85-06. The ATWS mitigation system should be testable at power (up to, but not necessarily including, the final actuation device). • Use of digital systems - See Appendix 7.0-A, “Review Process for Digital Instrumentation and Control Systems,” Appendix 7.1-D, and BTP 7-14, “Guidance On Software Reviews for Digital Computer-Based Instrumentation and Control Systems,” BTP 7-17, “Guidance on Self-Test and Surveillance Test Provisions,” BTP 7-18, “Guidance on the Use Of Programmable Logic Controllers in Digital Computer-Based Instrumentation and Control Systems,” BTP 7-19, Guidance for Evaluation of Diversity and Defense-in-Depth in Digital Computer- Based Instrumentation and Control Systems,” and BTP 7-21, Guidance on Digital Computer Real-Time Performance.” • Power supply availability - The reviewer should confirm with the organization responsible for the review of power systems that power sources will be available during and following a loss of offsite power. • Environmental qualification - The diverse I&C system equipment as installed should be qualified for the environment that could exist during the events for which the equipment is assumed to respond. 7.8-8 Revision 6 – August