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

DRAFT B - August 2020
© NEI 2020. All rights reserved. nei.org 13 Digital System or
Component
Is the SSC High SSSR?
Section 7.0
No
Yes
Verify Platform Software Meets SDOs Provided in
Section 9.0
Document Results in the Assurance Case
Section 11.0
Evaluate use of RIS 2002-22 Supplement End Software CCF
Evaluation
Application Software?
No
Yes
Verify Application Software Meets SDOs Provided in
Section 10.0
Figure 2
HSSSR Software CCF Evaluation Process Section 9 below provides goals and SDOs for evaluating HSSSR platform software. Section 10 provides goals and SDOs for evaluating HSSSR application software. Section 11 describes the elements of an assurance case to clearly document adherence to the SDOs as well as any exceptions taken to the guidance in this document.

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