Document: NUREG-0800
Document ID: 644c1fee-247e-4265-9466-5876937a7120
Document Type: srp
Title: INFORMATION SYSTEMS IMPORTANT TO SAFETY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550086.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.5
CFR Part: 
CFR Title: 

Content:
or bypass of a protective function should not be a credible consequence of failures occurring in the indication equipment, and the bypass indication should not reduce the required independence between redundant safety systems. I. Use of digital systems - See SRP Appendix 7.0-A and Appendix 7.1-D. Recommended review emphasis for annunciator systems J. Reliability - The applicant/licensee should justify that the degree of redundancy, diversity, testability, and quality provided in annunciator systems is adequate to support normal and emergency operations. SRP Appendix 7.1-C subsection 5.15, “Reliability,” provides guidance on the evaluation of safety system reliability that may be used in evaluating the reliability of annunciator systems. K. Use of digital systems - See SRP Appendix 7.0-A and Appendix 7.1-D. L. Independence (isolation between safety systems and other systems) - See SRP Appendix 7.1-B subsection 4.7, “Control and Protection System Interaction,” and SRP Appendix 7.1-C subsections 5.6, “Independence,” and 6.3, “Interaction Between the Sense and Command Features and Other Systems.” Additional items for emphasis for ALWR annunciator systems M. Redundancy - Redundant alarm systems should be provided. These redundant systems need not comply with the single failure criterion, but independence between the redundant systems should be equivalent to that provided between redundant channels of the safety systems. See SRP Appendix 7.1-C subsection 5.6, “Independence.” 7.5-10 Revision 5 - March 2007 N. Self-test provisions - See SRP BTP 7-17. The surveillance test portions of this BTP are not applicable. O. Compliance with IEEE Std. 603-1991 - Alarms that are provided for manually controlled actions for which no automatic control is provided and that are required for the safety systems to accomplish their safety functions should be reviewed against the requirements of IEEE Std. 603-1991. See SRP Appendix 7.1-C. This review is directed by Staff