Document: NUREG-0800
Document ID: dc63e8aa-2a74-4078-9e19-9a26ed1b4d8c
Document Type: srp
Title: Revision 6 – July 2012
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1105/ML110550791.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
functions, or those portions whose operation or failure could impair safety functions, shall be exercised during testing. This includes, as appropriate, exercising and monitoring the memory, the CPU, inputs and outputs, display functions, diagnostics, associated components, communication paths, and interfaces. Testing shall demonstrate that the performance requirements related to safety functions have been met. The use of the term “software” or “software-based” should be extended to any form of logic that is used in a safety system to accomplish a safety system function and relies upon the use of software for its development. Similarly, the use of the phrase “All portions of a computer” should be extended to “All components of a safety system relying upon a software development system.” Clause 5.4.1 of IEEE Std. 7-4.3.2-2003 directs the system developer or user to perform equipment qualification of the system (i.e., hardware and software) in its operational states while the system is operating at the limits of its equipment qualification envelope. The logic and diagnostics should be representative of the logic used in actual operation to a degree that provides assurance that the system states produced by the actual system will be tested during the equipment qualification process. 3.10 Displays and Manual Controls Displays and manual controls provided for compliance with Point 4 of the NRC position on D3 should be sufficient both for monitoring the plant state and to enable control room operators to actuate systems that will place the plant in a safe shutdown condition. In addition, the displays and controls should be sufficient for the operator to monitor and control the following critical safety functions: reactivity level, core heat removal, reactor coolant inventory, containment isolation, and containment integrity. These displays and controls provide plant operators with information and control capabilities that are not subject to CCF due to