4#p U.S. NUCLEAR REGULATORY COMMISSION::j STANDARD REVIEW PLAN a OFFICE OF NUCLEAR REACTOR REGULATION 2.4.6 PROBABLE MAXIMUM TSUNAMI FLOODING REVIEW RESPONSIBILITIES

The geohydrological design basis of the plant (discussed in Regulatory Guide 1.59) is developed in this section of the Safety Analysis Report (SAR) to determine the extent of plant protection required for tsunami flooding and drawdown (outlined in Regulatory Guide 1.102). The areas of review include the hydrologic character-istics of the maximum locally and distantly generated tsunami and the techniques, methodologies and parameters, including the geoseismic parameters of the genera-tors, used in the determination of the design basis.tsunami. Hydrologic analysis techniques, including tsunami formation, propagation and shoal-ing models, and coincident water levels, *including astronomical tide, storm surges and waves, are reviewed. The Geosciences Branch (GB) as part of its secondary review responsibility will review geologic and seismic characteristics of potential tsunamic faults. Areas of review include earthquake magnitude, focal depth, source dimensions, fault orien-tation, and vertical displacement. GB will review the applicant's values of the parameters, discussed above, used to model tsunami. The values used may represent upper bounds of the parameters. If there is disagreement with the applicant's pro-posed values, GB will provide alternative values. GB will provide a written dis-cussion of its review of the geologic and seismic characteristics of potential tsu-nami sources to be included in the SER input for this section. II. ACCEPTANCE CRITERIA Acceptance criteria for this SRP section relate to the following regulations: 1. General Design Criterion 2 (GDC 2) as it relates to structures, systems, and components important to safety being designed to withstand the effects of tsunami. Rev. 2- July 198