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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CFR Title: 

Content:
sider the consequences of failure, only the existence of failure. Redundancy - Multiple SSC’s each capable of performing a given function. Requirements Traceability Matrix (RTM) - An RTM shows every requirement, broken down in to sub-requirements as necessary, and what portion of the software requirement, software design description, actual code, and test requirement addresses that system requirement. Resources (as a software life cycle process planning characteristic) - The material resources necessary to carry out the work defined in the planning document. The resource characteristics of software life cycle plans discussed in SRP BTP 7-14 are: budget, methods/tools, personnel, and standards. Appendix 7-B-9 Revision 5 - March 2007 Robustness (as a software functional characteristic) - The ability of a software system or component to function correctly in the presence of invalid inputs or stressful environmental conditions. This includes the ability to function correctly despite some violation of the assumptions in its specification. Safe shutdown systems - Those systems which function to achieve and maintain a safe shutdown condition of the plant. The safe shutdown systems include those I&C systems used to maintain the reactor core in a subcritical condition and provide adequate core cooling to achieve and maintain both hot and cold shutdown conditions. Safety (as a software functional characteristic) - Those properties and characteristics of the software system that directly affect or interact with system safety considerations. The safety characteristic is primarily concerned with the effect of the software on system hazards and the measures taken to control those hazards. Safety systems - Those systems that are relied upon to remain functional during and following design basis events to assure the integrity of the reactor coolant pressure boundary; the capability to shut down the reactor and maintain it in a safe shutdown condition; or the capability to prevent