Document: NUREG-0800
Document ID: 4f097781-0d4c-4b5b-be06-a3cd19ae9fe8
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660430.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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Internal consistency denotes the consistency within the different parts of a component; for example, a software design is internally consistent if no set of design elements are mutually contradictory. External consistency denotes the consistency between one component and another; for example, software requirements and the resulting code are consistent with one another if there are no contradictions between the requirements and the code. Appendix 7-B-5 Revision 5 - March 2007 Control systems - Those systems used for normal operation that are not relied upon to perform safety functions following anticipated operational occurrences or accidents. The control systems evaluated using SRP Chapter 7 are those which control plant processes having a significant impact on plant safety, but are not wholly incorporated into systems addressed by other SRP chapters. Correctness - The degree to which a design output is free from faults in its specification, design, and implementation. There is considerable overlap between correctness properties and properties of other characteristics such as accuracy and completeness. Critical characteristics - Properties or attributes that are essential for performance of an equipment’s safety function. [IEEE Std 934-1987] Data communication systems (DCS) - Systems that transmit signals between systems and between components of systems. Data communication systems may include analog and digital multiplexers as well as non-multiplexed transmission. Where such systems are included in a design, they support one or more of the I&C systems. Design acceptance criteria (DAC) - A set of prescribed limits, parameters, procedures, and attributes upon which the NRC relies in making a final safety determination to support design certification when detailed design information is not available. The DAC are part of the Tier 1 information. Design certification document (DCD) - The master document that contains the information that is referenced by the design