CURRENT METEOROLOGICAL HAPPENINGS THE SITING AND ACCIDENT CONSEQUENCES BRANCH

1. CURRENT METEOROLOGICAL HAPPENINGS THE SITING AND ACCIDENT CONSEQUENCES BRANCH DIVISION OF SITE AND ENVIRONMENTAL REVIEWS OFFICE OF NEW REACTORS Brad Harvey, Senior Physical Scientist Joseph Hoch, Physical Scientist U.S. Nuclear Regulatory Commission June 25 - 27, 2008 Nuclear Utilities Meteorological Data Users Group (NUMUG)

2. PRESENTATION OUTLINE • RECENTLY COMPLETED ACTIVITIES • PLANNED ACTIVITIES • 3) STAFF FEEDBACK FROM REVIEWING COMBINED LICENSE APPLICATIONS

3. RECENTLY COMPLETED ACTIVITIES • Revision 0 to Regulatory Guide 1.206 Issued “Combined License Applications for Nuclear Power Plants” (June 2006) C.I.2: Site Characteristics C.III.1: Information Needed for a Combined License Application Referencing a Certified Design C.III.1.2 Site Characteristics C.III.2: Information Needed for a Combined License Application Referencing a Certified Design and an Early Site Permit C.III.2.2 Site Characteristics

4. RECENTLY COMPLETED ACTIVITIES • NUREG-0800 (i.e., Standard Review Plan) Updated Review of Safety Analysis Reports for Nuclear Power Plants (March 2007) • 2.0: Site Characteristics and Site Parameters (Rev. 0) • 2.3.1: Regional Climatology (Rev. 3) • 2.3.2: Local Meteorology (Rev. 3) • 2.3.3: Onsite Meteorological Measurements Programs (Rev. 3) • 2.3.4: Short-Term Dispersion Estimates • for Accident Releases (Rev. 3) • 2.3.5: Long-Term Atmospheric Dispersion Estimates • for Routine Releases (Rev. 3)

5. RECENTLY COMPLETED ACTIVITIES • Revision 4 to Regulatory Guide 1.97 Issued “Criteria For Accident Monitoring Instrumentation For Nuclear Power Plants” (June 2006) • Revision 1 to Regulatory Guide 1.23 Issued “Meteorological Monitoring Programs for Nuclear Power Plants” (March 2007) • Revision 2 to Regulatory Guide 1.76 Issued “Design-Basis Tornado and Tornado Missiles for Nuclear Power Plants” (March 2007)

6. Enhanced Fujita Scale

7. Regulatory Guide 1.76 Tornado Intensity Regions

8. UPCOMING ACTIVITIES • New Regulatory Guide Design-Basis Hurricane and Hurricane Missiles for Nuclear Power Plants • Revision 2 to Regulatory Guide 1.145 Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nuclear Power Plants • Revision 2 to Regulatory Guide 1.111 Methods for Estimating Atmospheric Transport and Dispersion of Gaseous Effluents in Routine Releases from Light-Water-Cooled Reactors • Revision 1 to Regulatory Guide 1.194 Atmospheric Relative Concentrations for Control Room Radiological Habitability Assessments at Nuclear Power Plants

9. UPCOMING ACTIVITIES • Revision 2 to Regulatory Guide 1.78 Evaluating the Habitability of a Nuclear Power Plant Control Room During a Postulated Hazardous Chemical Release • Revision 3 to Regulatory Guide 1.27 Ultimate Heat Sink for Nuclear Power Plants • Update to SACTI Cooling Tower Model • Interim Staff Guidance Assessment of Normal and Extreme Winter Precipitation Loads on the Roof of Seismic Category I Structures

10. COL APPLICATION FEEDBACK Thus far, the Commission has received NINE COL Applications. The following is a summary of issues / topics that have been commonly associated with requests for additional information (RAIs) for SRP Sections 2.3.1 through 2.3.5. 2.3.1: Regional Meteorology 2.3.2: Local Meteorology 2.3.3: Onsite Meteorological Measurement Programs 2.3.4: Short-Term Dispersion Estimates for Accident Releases 2.3.5: Long-Term Dispersion Estimates for Routine Releases

11. COL APPLICATION FEEDBACK • SRP Section 2.3.1, Regional Meteorology • Representativeness of Offsite Data Sources • Identifying NCDC Climate Division • ASCE 3-Second Gust Wind Importance Factors • Normal and Extreme Snow Loads • NCDC Local Storm Events Data

12. COL APPLICATION FEEDBACK • SRP Section 2.3.1, Regional Meteorology (Cont.) • Correct and Adequate References • NOAA CSC’s Hurricane Database • Design Basis Temperatures (Adequate Return Period) • Site Characteristics and Site Parameter Comparison Table • Additional Information Beyond the SRP

13. COL APPLICATION FEEDBACK • SRP Section 2.3.1, Regional Meteorology (Cont.) • Ultimate Heat Sink Site Characteristics • Addressing Climate Change • 100-Year Return Period vs. Most Severe Occurrence

14. COL APPLICATION FEEDBACK • SRP Section 2.3.2, Local Meteorology • SACTI Inputs • Additional Information Beyond the SRP • Consequences of EPA Non-Attainment Air Quality Standards

15. COL APPLICATION FEEDBACK • SRP Section 2.3.3, Onsite Meteorological Measurement Programs • Distinct COLA Sections for Preoperational and Operational Programs • Demonstration of RG 1.23 Compliance • Trees Surrounding the Meteorological Tower • Submitting Hourly Meteorological Data in RG 1.23 Format • Comparison of Hourly Data with Old Site Data and Surrounding Data • Impacts of Nearby Structures on Measurement Accuracy and Adequacy

16. COL APPLICATION FEEDBACK • SRP Section 2.3.4, Short-Term Dispersion Modeling for Accident Releases • Dispersion Model Inputs • Adequacy of Dispersion Models • Terrain and Water Influences • Control Room Dispersion Modeling Input Description • Site Map with Control Room Intakes and Release Points • Comparison with DCD Site Parameters

17. COL APPLICATION FEEDBACK • SRP Section 2.3.5, Long-Term Dispersion Modeling for Routine Releases • Dispersion Model Inputs • Adequacy of Dispersion Models • Terrain and Water Influences • Comparison with DCD Site Parameters

18. THANK YOU QUESTIONS?