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					    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)
PRESENTATION OUTLINE

1) RECENTLY COMPLETED ACTIVITIES


2) PLANNED ACTIVITIES


3) STAFF FEEDBACK FROM REVIEWING
   COMBINED LICENSE APPLICATIONS
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
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)
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)
Enhanced Fujita Scale
Regulatory Guide 1.76 Tornado Intensity Regions
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
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
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
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
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
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
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
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
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
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
THANK YOU


QUESTIONS?

				
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