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:
all DCSs that support safety functions. The NRC staff concludes that the design of the DCS meets the relevant requirements of 10 CFR 50.55a(h). The review included the identification of those systems and components for the DCS that are designed to survive the effects of earthquakes, other natural phenomena, abnormal environments, and missiles. Based on the review, the staff concludes that the applicant/licensee has identified those systems and components consistent with the design bases for those systems. Sections 3.10 and 3.11 of the SER address the qualification programs to demonstrate the capability of these systems and components to survive these events. Therefore, the staff finds that the identification of these systems and components satisfies the requirements of GDC 2 and 4. Additional evaluation findings applicable to all DCSs that support protection system functions (RTS, SRP Section 7.2, or ESFAS, SRP Section 7.3): Based on the review of system functions, the staff concludes that the DCS conforms to the design basis requirements of [IEEE Std. 603-1991 or IEEE Std. 279-1971] and 10 CFR 50.34(f). Setpoint analyses account for measurement inaccuracies attributable to the DCS in accordance with the guidance of Regulatory Guide 1.105, Revision 3. The staff concludes that the DCS adequately supports RTS and ESFAS functions as necessary to sense accident conditions and anticipated operational occurrences in order to initiate protective actions consistent with the accident analysis presented in Chapter 15 of the SAR and evaluated in the SER. Therefore, the staff finds that the DCS appropriately supports RTS and ESFAS compliance with the requirements of GDC 20. The DCS conforms to the guidelines for periodic testing in Regulatory Guide 1.22, “Periodic Testing 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