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:
art of or support the systems described in SRP Sections 7.2 through 7.8 of the applicant’s safety analysis report (SAR). The DCSs may include multiplexers and more general communication systems. The distinction between multiplexers and more general data communication systems is often blurred. For purposes of this SRP section, a multiplexer is defined as equipment that transmits, receives, or connects in turn several different signals over an electrical conductor or optical-fiber medium on a fixed schedule or rotation. Internal computer buses are specifically excluded from the definition of DCSs used in this SRP section. Multiplexers may be analog or digital. More generally, a DCS transmits one or more signals on one or more electrical or optical media according to some analog or digital encoding. The schedule for transmission of the various signals may not be fixed and particular signals or data may be transmitted at unpredictable intervals. Communications via media other than electrical conductors or optical fiber are not addressed by this SRP section. The review described in this SRP section includes communication between systems and communication between computers within a system. This SRP section addresses both safety and nonsafety communication systems. 2. Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC). For design certification (DC) and combined license (COL) reviews, the NRC staff reviews the applicant’s proposed ITAAC associated with the structures, systems, and components (SSCs) related to this SRP section in accordance with SRP Section 14.3, “Inspections, Tests, Analyses, and Acceptance Criteria.” The staff recognizes that the review of ITAAC cannot be completed until after the rest of this portion of the application has been reviewed against acceptance criteria contained in this SRP section. Furthermore, the staff reviews the ITAAC to ensure that all SSCs in this area of review are identified and addressed as appropriate in