Document: NUREG-0800
Document ID: be3ce44f-6784-4f40-baef-12c96ec1ff96
Document Type: srp
Title: provides additional guidance on digital data communications systems.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070670183.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.9
CFR Part: 
CFR Title: 

Content:
nal environment within which the software will operate, including precautions and BTP 7.14-64 Revision 5 - March 2007 limitations that must be observed during operations to avoid exposing personnel or the plant to hazards or security vulnerabilities. All variables in the physical environment that the software must monitor and control should be fully described. User interfaces should be fully described for each category of user. Consistency means that the operations manual is consistent with the system operations, safety system requirements, the safety system design, the SRSs, the SDS, and documented descriptions and known properties of the operational environment within which the safety system will operate. Individual user instructions should not contradict other instructions. Uniform and consistent terminology, notation, and definitions should be used throughout the operations manuals. Style means that the operations manual is understandable by the users of the manual. A precise definition of each technical term should exist, either in the operations manual or in a separate dictionary or glossary. The operations manual may be organized in the style of a reference manual, with the assumption that its users are well trained. Traceability means that a forward trace exists between the SRS, the operations plan, and the operations manual, which shows how each requirement is to be carried out by the operators, or carried out automatically by the safety system without operator action, and how the results of each requirement are displayed to the operators. A forward trace should also exist from all error messages generated by the code to a description of the error messages in the operations manual. Unambiguity means that instructions to users have only one interpretation for the users. B.3.3.7.2 Review Guidance for SBDs The reviewer should keep in mind that the intent of the staff review of manuals is to ensure that digital system is safe, and therefore the portion of the