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The Office of New Reactors and the Office of Nuclear Reactor Regulation are revising SRP Section 19.0, which updates Revision 2 (ADAMS Accession No. ML071700652) dated June 2007, to reflect the changes as listed in the description of changes. These changes include (1) incorporation of guidance previously contained in Interim Staff Guidance (ISG), DC/COL-ISG-003 (ADAMS Accession No. ML081430087) concerning the review of probabilistic risk assessment (PRA) information and severe accident assessments for new reactors submitted to support design certification (DC) and combined license (COL) applications, (2) incorporation of guidance previously contained in ISG DC/COL-ISG-020 (ADAMS Accession No. ML100491233) concerning review of information from PRA-based seismic margin analyses submitted in support of DC and COL applications, (3) incorporation of guidance previously contained in ISG DI&C/COL-ISG-003 (ADAMS Accession No. ML080570048) concerning review of digital instrumentation and control system PRAs, including common cause failures in PRAs and uncertainty analysis associated with new reactor digital systems, and (4) incorporation of additional procedures for review of PRA information and severe accident assessments developed during NRC reviews of DC and COL applications completed after ISG DC/COL-ISG-003 was issued. A redline document comparing Revision 2 and the current proposed Revision 3 can be found under ADAMS Accession No. ML12153A008. The NRC staff issues
For the Nuclear Regulatory Commission.