1 Current Issues in Siting Safety Reviews Michelle Hart, Sr. Reactor Engineer Division of Site and Environmental Reviews NRC Regulatory Information Conference.

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Presentation transcript:

1 Current Issues in Siting Safety Reviews Michelle Hart, Sr. Reactor Engineer Division of Site and Environmental Reviews NRC Regulatory Information Conference March 12, 2009.

2 Siting Safety Review Challenges Completed 3 ESPs, 1 ESP in progress and 17 COL applications in various stages of review Some common challenges emerging in site safety reviews –Level of Detail –Technical Sufficiency –RAI response timeliness

3 Groundwater Hydrology The groundwater flow and transport analyses presented in some COL applications are missing important details. The RAI process has schedule implications. Key assumptions of groundwater flow, especially post- construction, may require detailed analysis. Applicants should consider use of a groundwater model. Interim Staff Guidance on SRP and is under development to clarify other SRP guidance.

4 Surface Water Hydrology Trends show that flood levels from local intense precipitation may have very low margin. Modeling of local site drainage may require more robust methods. DCD limits on tolerable water surface elevations are unclear – some progress has been made, but not complete Tsunami Hazard Assessment at Nuclear Power Plant Sites in the United States of America (NUREG/CR 6966) near completion.

5 Source Zone Characterization for Probabilistic Seismic Hazard Analyses Last year noted challenges with some applications that limited consideration of new seismic information Held public meetings this past year Most applicants have now provided information to characterize source zones Early interactions essential for sites in regions not recently evaluated

6 Geotechnical Engineering Challenges noted last year with completeness of geotechnical information Completeness generally improving Challenges continue with complex or unique sites Challenges emerging with changing Design Certification criteria

7 Geology, Seismology & Geotechnical Engineering Other important accomplishments this year –Reached common understanding on consistent site response & soil-structure interaction calculations

8 On-site and Near Site Hazards Transported and Stored Chemicals –Insufficient information on chemicals –Chemicals screened out with no details other than followed RG 1.78 and 1.91 –Dispersion model assumptions and inputs not given

9 Actions to Address Issues Industry and NRC continue work to address common issues generically: –Closure has been achieved: Source zone characterization Consistent site response & soil-structure interaction calculations –Issues under discussion: ISG on groundwater radionuclide transport analysis Updates to RG 1.59, and RG Interactions between the applicant and NRC staff are useful in keeping review on track: –To promote an early exchange of technical information and submittal completeness –Timely RAI response and submittal of technical changes or supplements –Facilitate scheduling of NRC resources to complete the COL/ESP review.