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:
performance requirements, and physical requirements. Functionality (as a software functional characteristic) - Those operations which must be carried out by the software. Functions generally transform input information into output information in order to affect the reactor operation. Inputs may be obtained from sensors, operators, other equipment, or other software. Outputs may be directed to actuators, operators, other equipment, or other software. Handshake - A four-step process of linked acknowledgments between a sender and a receiver used to transmit data or signals reliably. A handshake involves a signal that (1) initiates the transaction (from the initiating member of a pair), (2) accepts the transaction (from the passive member), (3) terminates the transaction (from the initiator), and (4) acknowledges the termination and readiness for another transaction (from the passive member). Hardware critical characteristics - Properties or attributes of computer, peripheral, or communication hardware that are essential for performance if the safety function, including specifications that are required to execute the software intended to run on the hardware and the attributes of reliability, testability, or predictability, on which the staff’s safety findings are based. Implementation (as a software life cycle process planning characteristic) - Those characteristics of planning documents that describe the work necessary to achieve the purpose of the planning documents. The implementation characteristics of software life cycle plans discussed in SRP BTP 7-14 are: measurement, procedures, record keeping, and schedule. Information systems important to safety - Those systems which provide information to the operators for the safe operation of the plant during normal operation, anticipated operational occurrences, and accidents. The information systems important to safety include those systems which provide information for manual initiation and control of safety systems.