Document: NUREG-0800
Document ID: dd687b37-3f26-4512-91d8-633ddb655821
Document Type: srp
Title: DATA COMMUNICATION SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1602/ML16020A097.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.9
CFR Part: 
CFR Title: 

Content:
should address the applicable topics identified in SRP Table 7-1. SRP Appendix 7.1-A describes review methods for each topic. Major design considerations that should be emphasized in the review of the DCS are identified below: • Quality of components and modules - See SRP Appendix 7.1-B, Subsection 4.3, or SRP Appendix 7.1-C, Subsection 5.3. 7.9-7 Revision 6 - August 2016 • DCS software quality - See SRP BTP 7-14, “Guidance on Software Reviews for Digital Computer-Based Instrumentation and Control Systems.” • Performance - The review should verify that the protocol selected for the DCS meets the performance requirements of all supported systems. The real-time performance should be reviewed with SRP BTP 7-21, “Guidance on Digital Computer Real-Time Performance.” This should include verification that DCS safety system timing is deterministic or bounded. Time delays within the DCS and measurement inaccuracies introduced by the DCS should be considered when reviewing the instrumentation setpoints (refer to RG 1.105, “Setpoints for Safety-Related Instrumentation,” and SRP BTP 7-12, “Guidance on Establishing and Maintaining Instrument Setpoints”). Data rates, data bandwidths, and data precision requirements for normal and off-normal operation, including the impact of environmental extremes, should be reviewed. There should be sufficient excess capacity margins to accommodate likely future increases in DCS demands or software or hardware changes to equipment attached to the DCS. The error performance should be specified. Vendor test data and in situ test results should be reviewed to verify the performance. Analytical justifications of DCS capacity should be reviewed for correctness. The interfaces with other DCSs or other parts of the I&C system should be reviewed to verify compatibility. • Reliability - The potential hazards to the DCS and from the DCS should be reviewed. Unneeded but included DCS functions should be reviewed to ensure that they