Document: NUREG-0800
Document ID: 4f141c71-35ca-4353-9047-a13efe6d56b7
Document Type: srp
Title: Revision 6 - August 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A308.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
es by which the work will be carried out, and the tools used to implement those methods. Personnel - The numbers, qualification, and training of personnel required to carry out the work defined in the planning document. BTP 7.14-7 Revision 6 - August 2016 Standards - The international, national, industry and company standards and guidelines to be followed in the work defined in the planning document. A.3.2 Definitions of Functional and Process Characteristics The following paragraphs define the software characteristics important to safety system software. The definitions given are specific to software. Software characteristics can be divided into two sets: functional characteristics and process characteristics. The first set includes those characteristics that directly relate to the actions that the safety system software must take, while the second includes those characteristics of the software development process that contribute to assurance that the software will perform the required actions. Both sets are important in safety system software. The sets, and the definitions of the characteristics, are listed below. A.3.2.1 Definition of Functional Characteristics Accuracy - The degree of freedom from error of sensor and operator input, the degree of exactness exhibited by an approximation or measurement, and the degree of freedom from error of actuator output. Functionality - The operations which must be carried out by the software. Functions generally transform input information into output information. Inputs may be obtained from sensors, operators, other equipment, or other software. Outputs may be directed to actuators, operators, other equipment, or other software. Reliability - The degree to which a software system or component operates without failure. This definition does not consider the consequences of failure, only the existence of failure. Robustness - The ability of a software system or component to function correctly in the presence of invalid inputs