Document: NUREG-0800
Document ID: 949ca18d-b0e4-4b54-9ca9-fdb657988111
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660170.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
he same common-cause failure, should be provided to perform either the same function or a different function. The diverse or different function may be performed by a non-safety system if the system is of sufficient quality to perform the necessary function under the associated event conditions. (4) A set of displays and controls located in the main control room should be provided for manual, system-level actuation of critical safety functions and monitoring of parameters that support the safety functions. The displays and controls should be independent and diverse from the safety computer system identified in items (1) and (3) above. Applicability - RTS, ESFAS, control systems, diverse I&C systems, and supporting data communication systems in plants using digital computer-based RTS or ESFAS. Review Methods - SRP BTP 7-19 provides guidance for the evaluation of compliance with the SECY/SRM. SRP Sections 7.7 and 7.8 provide guidance for the review of control system and diverse I&C system features that are credited as non-safety diverse means of protecting against common-cause failure within the safety systems. (b) Item II.T, “Control Room Annunciator (Alarm) Reliability,” of Staff Requirements Memorandum on SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs” dated July 21, 1993 The annunciator system is considered to consist of sets of alarms (which may be displayed on tiles, video display units [VDUs], or other devices) and sound equipment; logic and processing support; and functions to enable operators to silence, acknowledge, reset, and test alarms. The main control room (MCR) should contain compact, redundant operator workstations with multiple display and control devices that provide organized, hierarchical access to alarms, displays, and controls. Each workstation should have the full capability to perform MCR functions as well as support division of tasks between two