Guidance for Addressing Software Common cause Failure In High Safety-Significant Safety Related Digital I&c systems


Software at the Application and Plant Integration Levels



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ML20245E561
10
Software at the Application and Plant Integration Levels
10.1
Requirements Quality
10.1.1
Goals
The safe design objectives for application software requirements quality are intended to achieve the following goals

Requirements correctly express system functions allocated to application software

Requirements completely express system functions allocated to application software

DRAFT B - August 2020
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Application software requirements are unambiguous

Application software requirements are understandable

Application software requirements provide a basis for verification and validation

When application software functions of different safety classifications are required in one system, independence between such software functions is expressly required (e.g., software functions within different safety classes do not interact or share data)
10.1.2

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