4 Purpose The purpose of this document is to 1. Establish a set of DI&C software CCF first principles to provide a framework for industry consensus on the fundamental principles upon which an approach to adequately address software CCF can be developed. Appendix A provides a mapping between these first principles and existing NRC regulatory framework. 2. Provide a set of SDOs, representing a decomposition of the first principles, that can be used to demonstrate that a software CCF is adequately addressed. 3. Explain the use of an assurance case to demonstrate that the SDOs are adequately addressed to reach the conclusion that a software CCF is adequately addressed for an HSSSR DI&C system.
