Document: NUREG-0800
Document ID: b6428ab0-2037-4bac-9b93-b46af9f2fdfb
Document Type: srp
Title: DATA COMMUNICATION SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070650036.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.9
CFR Part: 
CFR Title: 

Content:
of Protection System Actuation Functions,” and Regulatory Guide 1.118, “Periodic Testing of Electric Power and Protection Systems.” The bypassed and inoperable status indication conforms to the guidelines of Regulatory Guide 1.47, “Bypassed and Inoperable Status Indication for Nuclear Power Plant Safety Systems.” The DCS conforms to the guidelines on the application for the single-failure criterion in IEEE Std. 379-2000, “IEEE Standard Application of the Single-Failure Criterion to Nuclear Power Generating Station Safety Systems,” as supplemented by Regulatory Guide 1.53, “Application of the Single-Failure Criterion to Nuclear Power Plant Protection Systems.” Based on the review, the staff concludes that the DCS satisfies the requirement of [IEEE Std. 603-1991 or IEEE Std. 279-1971] with regard to the system reliability and testability. Therefore, the staff finds that the DCS satisfies these requirements of GDC 21. 7.9-10 Revision 5 - March 2007 Based on the review of software development plans and the inspections of the computer development process and design outputs, the staff concludes that the computer systems conform to the guidance of Regulatory Guide 1.152, Revision 2. Therefore, the special characteristics of computer systems have been adequately addressed, and the staff finds that the DCS satisfies these requirements of GDC 21. DCS functions were included in the staff’s review of diversity and defense-in-depth analysis for RTS and ESFAS. Based on this review, the staff concludes that the protection systems, including the DCS functions, comply with the criteria for defense against common-cause failure in digital I&C systems. Therefore, the staff finds that adequate diversity and defense against common-cause failure has been provided to satisfy the diversity guidance of GDC 22 and the Staff Requirements Memorandum on SECY-93-087, Item II.Q. The staff has reviewed EMI/RFI susceptibility and seismically exposed portions of the DCS. Based on