Newly-Developed Method
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Newly-Developed Method (NDM : A PRA method that has either been developed separately from a state-of-practice method or is one that involves a fundamental change to a state-of-practice method. An NDM is not a state-of-practice or a consensus method.
The industry developed guidance published in PWROG-19027-NP that addresses, amongst other things, the technical adequacy of NDMs. The NRC staff subsequently endorsed specified portions of PWROG-19027-NP in RG 1.200, Revision 3.