Document: NUREG-0800
Document ID: 5b4fe75c-0560-40a2-9e68-366d25bc7ea0
Document Type: srp
Title: and 7.3.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500552.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.2
CFR Part: 
CFR Title: 

Content:
be described, along with the coordination of communication system bypass or inoperable status with the bypass and inoperable status of the safety system of which the communication system is part. • Timing and data rate requirements should be included. Message formats and the approximate frequency at which each type of message appears on each data link should be included. • The maximum traffic rate (messages per second and bytes per second) on each line should be specified, and the conditions under which these rates will occur should be identified. • The method for establishing communication independence between redundant channels of a communication system and between safety and non-safety systems should be described. Final system drawings may not be available at the design certification stage. In that case, the minimum set of information described above for Sections 7.2 through 7.7 will be acceptable for Section 7.9. Analysis Analysis of each data communication system should be provided to demonstrate that the requirements applicable to the I&C functions supported by the data communication systems are satisfied. For data Appendix 7-A Rev. 4 — June 1997 BTP HICB-16-7 communication systems this analysis should demonstrate that the system design, including error handling performance, supports the timing and reliability requirements of the supported systems. Data communication system failure modes should be identified, and the effect of these failures on supported systems should be analyzed. Such analysis may be incorporated into the failure mode and effects analysis of each supported system. The immunity of the data communication system to design basis EMI/RFI should be demonstrated. This analysis should address both resistance to noise and prevention of fault propagation between redundant channels or systems. For data communication systems that support RTS or ESFAS functions, the analysis should demonstrate that the design is consistent with the assumptions