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:
e 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 that the applicant/licensee verifies conformance to these requirements by validation testing and surveillance. • Quality of components and modules - Generic Letter 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/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, Appendix 7.1-D, and BTPs 7-14, 7-17, 7-18, 7-19, and 7-21. 7.8-7 Revision 5 - March 2007 • 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. • System status - Information should be available in the control room to indicate the operation of the diverse I&C systems. This aspect of the review may involve considerations included in emergency operating procedures. • Independence from the protection systems - Diverse actuation systems functions should be independent and diverse from the RTS and ESFAS. ATWS mitigation systems should be diverse from