CURRENT METEOROLOGICAL HAPPENINGSCURRENT METEOROLOGICAL HAPPENINGS

THE SITING AND ACCIDENT CONSEQUENCES BRANCHTHE SITING AND ACCIDENT CONSEQUENCES BRANCH

DIVISION OF SITE AND ENVIRONMENTAL REVIEWS

OFFICE OF NEW REACTORS

Brad Harvey, Senior Physical ScientistJoseph Hoch, Physical Scientist

U.S. Nuclear Regulatory Commission

June 25 - 27, 2008Nuclear Utilities Meteorological Data Users Group (NUMUG)

PRESENTATION OUTLINEPRESENTATION OUTLINE

1) RECENTLY COMPLETED ACTIVITIES

2) PLANNED ACTIVITIES

3) STAFF FEEDBACK FROM REVIEWING COMBINED LICENSE APPLICATIONS

RECENTLY COMPLETED ACTIVITIESRECENTLY 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

• NUREG-0800 (i.e., Standard Review Plan) UpdatedReview 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)

RECENTLY COMPLETED ACTIVITIESRECENTLY 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)

RECENTLY COMPLETED ACTIVITIESRECENTLY COMPLETED ACTIVITIES

Enhanced Fujita ScaleEnhanced Fujita Scale

Regulatory Guide 1.76 Tornado Intensity RegionsRegulatory Guide 1.76 Tornado Intensity Regions

UPCOMING ACTIVITIESUPCOMING ACTIVITIES

• New Regulatory GuideDesign-Basis Hurricane and Hurricane Missiles for Nuclear Power Plants

• Revision 2 to Regulatory Guide 1.145Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nuclear Power Plants

• Revision 2 to Regulatory Guide 1.111Methods for Estimating Atmospheric Transport and Dispersion of Gaseous Effluents in Routine Releases from Light-Water-Cooled Reactors

• Revision 1 to Regulatory Guide 1.194Atmospheric Relative Concentrations for Control Room Radiological Habitability Assessments at Nuclear Power Plants

• Revision 2 to Regulatory Guide 1.78Evaluating the Habitability of a Nuclear Power Plant Control Room During a Postulated Hazardous Chemical Release

• Revision 3 to Regulatory Guide 1.27Ultimate Heat Sink for Nuclear Power Plants

• Interim Staff GuidanceAssessment of Normal and Extreme Winter Precipitation Loads on the Roof of Seismic Category I Structures

UPCOMING ACTIVITIESUPCOMING ACTIVITIES

• Update to SACTI Cooling Tower Model

COL APPLICATION FEEDBACKCOL 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

COL APPLICATION FEEDBACKCOL 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

COL APPLICATION FEEDBACKCOL 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

COL APPLICATION FEEDBACKCOL 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

COL APPLICATION FEEDBACKCOL APPLICATION FEEDBACK

SRP Section 2.3.2, Local Meteorology

• SACTI Inputs

• Additional Information Beyond the SRP

• Consequences of EPA Non-Attainment Air Quality Standards

COL APPLICATION FEEDBACKCOL 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

COL APPLICATION FEEDBACKCOL 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

COL APPLICATION FEEDBACKCOL 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

THANK YOUTHANK YOU

QUESTIONS?