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:
hat 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 operators. Appendix 7.1-A-25 Revision 5 - March 2007 The display and control features should be designed to satisfy existing regulations, for example, separation and independence requirements for Class 1E circuits (IEEE Std. 384-1992, “IEEE Standard Criteria for Independence of Class 1E Equipment and Circuits”); criteria for protection systems (IEEE Std. 279-1971); and specifications for manual initiation of protective actions at the systems level (Regulatory Guide 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 assure 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 safety and supporting data communication systems in ALWRs. For nuclear power plants with construction permits issued before January 1, 1971, the display and control features should be consistent with their licensing basis or may meet the standards of IEEE Std. 603-1991 (including the correction sheet dated January 30, 1995). For nuclear power plants with construction permits issued after January 1, 1971, but before May 13, 1999, the display and control features should meet the standards of IEEE Std. 279-1971 or IEEE Std. 603-1991 (including the correction sheet dated January 30, 1995). For nuclear power plants with construction permits issued after May