Document: NUREG-0800
Document ID: d52a97d0-a519-4817-9ad6-64d94c9518af
Document Type: srp
Title: DATA COMMUNICATION SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159B177.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.9
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Content:
iew. The review should include an evaluation of the DCS against the guidance of IEEE Std 603-1991 or IEEE Std 279-1971, depending on the applicant’s or licensee’s commitment regarding these design criteria, and IEEE Std -7-4.3.2 as endorsed by RG 1.152. Procedures for these reviews are detailed in SRP Appendix 7.1-B for IEEE Std 279-1971, SRP Appendix 7.1-C for IEEE Std 603-1991, and SRP Appendix 7.1-D for IEEE Std -7-4.3.2. Although the primary emphasis is on the equipment comprising the DCS, the reviewer should consider the DCS functions at the system level. The DCS design should be compatible with the design of the supported systems as described in the process system chapters of the SAR and their functions and performance as assumed in the SAR Chapter 15 design bases accident analyses. It is not sufficient to evaluate the adequacy of the DCS only on the basis of the design’s meeting the specific requirements of IEEE Std 279-1971 or IEEE Std 603-1991. The DCS review 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. • DCS software quality - See SRP BTP 7-14. • 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. 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). Data rates, data bandwidths, and data precision requirements for normal and off-