This report consists of eight sections and four appendices. Section D.2 is an overview of the analysis steps. Section D.3 summarizes the service experience applicable to the BWR and PWR Base Cases, respectively. Using the PIPExp database, Section D.4 includes a summary of the data interpretation and data processing steps necessary to derive piping reliability parameters that apply to the base case definitions. Section D.5 documents the results of the pipe failure rate estimation while Section D.6 is a documentation of the models used for estimating LOCA frequency, while Section D.7 is a summary of results. Section D.8 is a list of references. Note that the Base Case results used in Table E. 1 in the main body can be obtained from Tables 16, 17, and 20 in this report.

Appendix A summarizes the PIPExp database structure. Appendix B includes the Excel spreadsheets that are used as the basis for the LOCA frequency models, and Appendix C includes the Excel spreadsheets for the calculation of time-dependent LOCA frequencies. Finally, Appendix D is a summary of selected, significant Code Class 1 and 2 pipe failures in commercial nuclear power plants worldwide.