Document: NUREG-0800
Document ID: ac3185c1-0851-4b4d-b3f5-31c884360119
Document Type: srp
Title: Setpoints
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A088.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.2
CFR Part: 
CFR Title: 

Content:
within the safety systems. (b) Item II.T, “Control Room Annunciator (Alarm) Reliability,” of SRM on SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs,” dated July 21, 1993. Appendix 7.1-A-27 Revision 6 – August 2016 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 to support the division of tasks between two operators. The display and control features should be designed to satisfy existing regulations, for example, separation and independence requirements for Class 1E circuits (IEEE Std 384, “IEEE Standard Criteria for Independence of Class 1E Equipment and Circuits”); criteria for protection systems (IEEE Std 279-1971); and specifications for the manual initiation of protective actions at the systems level (RG 1.62, “Manual Initiation of Protection Action”). The designer should use existing defensive measures (e.g., segmentation, fault tolerance, signal validation, self-testing, error checking, supervisory watchdog programs), as appropriate, to ensure that alarm, display, and control functions provided by the redundant workstations meet these criteria. Alarms that are provided for manually controlled actions for which no automatic control is provided, and that are required for the safety systems to accomplish their safety functions, should meet the applicable specifications for Class 1E equipment and circuits. Applicability - Information systems important to