11

ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

American National Standard forAmerican National Standard forDetermining Meteorological Determining Meteorological

InformationInformationat Nuclear Facilitiesat Nuclear Facilities

R. Brad Harvey, CCMR. Brad Harvey, CCM

Physical ScientistPhysical ScientistOffice of Nuclear Reactor RegulationOffice of Nuclear Reactor RegulationU.S. Nuclear Regulatory CommissionU.S. Nuclear Regulatory Commission

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Presentation TopicsPresentation Topics

• History of U.S. NRC Meteorological History of U.S. NRC Meteorological Monitoring GuidanceMonitoring Guidance

• ANS/ANSI 3.11-2005ANS/ANSI 3.11-2005

• Potential Updates to U.S. NRC Potential Updates to U.S. NRC Meteorological Monitoring GuidanceMeteorological Monitoring Guidance– 33rdrd Proposed Revision 1 to RG 1.23 Proposed Revision 1 to RG 1.23

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Safety Guide 23 (RG 1.23)Safety Guide 23 (RG 1.23)

• Issued in Feb 1972Issued in Feb 1972• Guidance TopicsGuidance Topics

– ParametersParameters• Minimum 2 levels of wind speed, wind direction, tempMinimum 2 levels of wind speed, wind direction, temp• Dew point or humidity where there is an potential for Dew point or humidity where there is an potential for

increased fogging/icingincreased fogging/icing– SitingSiting

• Tower at same elevation as plantTower at same elevation as plant• Avoid influence of nearby structuresAvoid influence of nearby structures• Measurements atMeasurements at

– 10m10m– Vent release heightVent release height– Stack height (if applicable)Stack height (if applicable)

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Safety Guide 23 (RG 1.23)Safety Guide 23 (RG 1.23)

• Guidance Topics (cont’d)Guidance Topics (cont’d)– Data recordingData recording

•Dual recorders (2 digital or 1 analog/1 Dual recorders (2 digital or 1 analog/1 digital)digital)

– Instrument AccuracyInstrument Accuracy•Wind direction: Wind direction: ±5° (instantaneous values)±5° (instantaneous values)

•Wind speed: ±5mph (time average)Wind speed: ±5mph (time average)

•Temperature: ±0.5°C (time average)Temperature: ±0.5°C (time average)

•Delta-temperature: ±0.1°C (time average)Delta-temperature: ±0.1°C (time average)

•Dew point: ±0.5°C (time average)Dew point: ±0.5°C (time average)

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Safety Guide 23 (RG 1.23)Safety Guide 23 (RG 1.23)

• Guidance Topics (cont’d)Guidance Topics (cont’d)– Maintenance and ServicingMaintenance and Servicing

•90% data recovery goal90% data recovery goal

•Semiannual calibrationsSemiannual calibrations

– Data reduction and compilationData reduction and compilation•Data averaged over 15Data averaged over 15–60 min–60 min

•Compiled into annual Joint Frequency Compiled into annual Joint Frequency DistributionsDistributions

•Stability based on delta-Stability based on delta-T or sigma-thetaT or sigma-theta

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Safety Guide 23 (RG 1.23)Safety Guide 23 (RG 1.23)

• Guidance Topics (cont’d)Guidance Topics (cont’d)– Special ConsiderationsSpecial Considerations

•Additional monitoring in complex terrainAdditional monitoring in complex terrain

•Precipitation and Solar Radiation may be Precipitation and Solar Radiation may be desirabledesirable

– DocumentationDocumentation•Describe program in FSARDescribe program in FSAR

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(1(1stst) Proposed Rev. 1 to RG ) Proposed Rev. 1 to RG 1.231.23

• Issued in Sept 1980 (post-TMI)Issued in Sept 1980 (post-TMI)

• Additional GuidanceAdditional Guidance– SitingSiting

•Avoiding structure influencesAvoiding structure influences

• Instrument boom length/orientationInstrument boom length/orientation

•Aspirated temperature shieldsAspirated temperature shields

•10m & 60m measurement heights, higher 10m & 60m measurement heights, higher for stacksfor stacks

•Additional monitoring for coastal & valley Additional monitoring for coastal & valley sitessites

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(1(1stst) Proposed Rev. 1 to RG ) Proposed Rev. 1 to RG 1.231.23• Additional Guidance (cont’d)Additional Guidance (cont’d)

– Data RecordingData Recording•Sampling ratesSampling rates•CR/TSC/EOF displaysCR/TSC/EOF displays

– System AccuracySystem Accuracy– Data Reduction & CompilationData Reduction & Compilation

•Hourly averagesHourly averages•Hourly database submittalHourly database submittal

– Quality AssuranceQuality Assurance•10 CFR Part 50 Appendix B10 CFR Part 50 Appendix B

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(1(1stst) Proposed Rev. 1 to RG ) Proposed Rev. 1 to RG 1.231.23

• Additional Guidance (cont’d)Additional Guidance (cont’d)– Special Considerations for Emergency Special Considerations for Emergency

PreparednessPreparedness• Independent 10m backup towerIndependent 10m backup tower

•Remote interrogationRemote interrogation

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ANSI/ANS-2.5-1984ANSI/ANS-2.5-1984

• Approved in September 1984Approved in September 1984

• Many aspects in common with Many aspects in common with Proposed Rev. 1 to RG 1.23Proposed Rev. 1 to RG 1.23– Did not include “Special Considerations for Did not include “Special Considerations for

Emergency Preparedness”Emergency Preparedness”•No references to 10m backup tower or remote No references to 10m backup tower or remote

interrogationinterrogation

• Reaffirmed in 1990; withdrawn in 2000Reaffirmed in 1990; withdrawn in 2000

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22ndnd Proposed Rev. 1 to RG Proposed Rev. 1 to RG 1.231.23

• Issued in April 1986Issued in April 1986

• Endorsed ANSI/ANS-2.5-1984Endorsed ANSI/ANS-2.5-1984– Took exception to ANSI/ANS-2.5-1984 Took exception to ANSI/ANS-2.5-1984

QA program guidanceQA program guidance

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ANSI/ANS-3.11-2000ANSI/ANS-3.11-2000

• Approved in February 2000Approved in February 2000• Expanded Applicability to Nuclear Facilities Expanded Applicability to Nuclear Facilities

in Public Sector (e.g. National Labs)in Public Sector (e.g. National Labs)• Cooperative EffortCooperative Effort

– NUMUGNUMUG– DMCCDMCC

• Moved ANS Subcommittees Moved ANS Subcommittees – From:From:ANS-2 Site EvaluationANS-2 Site Evaluation– To:To: ANS-3 Reactor OperationsANS-3 Reactor Operations

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ANSI/ANS-3.11-2000ANSI/ANS-3.11-2000

• Guidance TopicsGuidance Topics– Meteorological MeasurementsMeteorological Measurements– Siting of Meteorological InstrumentationSiting of Meteorological Instrumentation– Data AcquisitionData Acquisition– Data Base ManagementData Base Management– System PerformanceSystem Performance– Appendixes Appendixes (for information only)(for information only)

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• Approved by ANS December 2005Approved by ANS December 2005– Awaiting approval by ANSI before Awaiting approval by ANSI before

publishingpublishing

• Updates/EnhancementsUpdates/Enhancements– System calibration methodsSystem calibration methods– System accuracy calculationsSystem accuracy calculations– Editorial and clarity changesEditorial and clarity changes

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• Meteorological Monitoring SystemMeteorological Monitoring System– Basic Meteorological MeasurementsBasic Meteorological Measurements

• Wind speed, wind direction, temp, precipWind speed, wind direction, temp, precip

– Supplemental Meteorological MeasurementsSupplemental Meteorological Measurements• Moisture, solar/net radiation, pressure, mixing height, Moisture, solar/net radiation, pressure, mixing height,

etc.etc.

– Remote Sensing TechnologiesRemote Sensing Technologies• Sodar, radar wind profilers, NEXRAD, satellite data, etc.Sodar, radar wind profilers, NEXRAD, satellite data, etc.

– Sources of Other Surface ObservationsSources of Other Surface Observations– Meteorological Observation TowersMeteorological Observation Towers– Stability Class DeterminationStability Class Determination

• Delta-T, sigma theta, sigma phi, Monin-Obukhov length, Delta-T, sigma theta, sigma phi, Monin-Obukhov length, etc.etc.

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• Instrument SitingInstrument Siting– Topographic EffectsTopographic Effects

•Flat terrain, mountain, and shoreline sitesFlat terrain, mountain, and shoreline sites

– Instrument OrientationInstrument Orientation•Aerodynamic effects of obstacles, diabatic Aerodynamic effects of obstacles, diabatic

effectseffects

– Optional Site Selection TechniquesOptional Site Selection Techniques•Remote sensing, tracer studies, numerical Remote sensing, tracer studies, numerical

modeling, physical modeling, etc.modeling, physical modeling, etc.

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• Data AcquisitionData Acquisition– Recording MechanismsRecording Mechanisms

• Primary system: digitalPrimary system: digital

• Optional backup system: analog or digitalOptional backup system: analog or digital

– Sampling FrequenciesSampling Frequencies• Averaging: At least 30 samples at intervals no longer Averaging: At least 30 samples at intervals no longer

than 60 sec spaced over not less than 10 min periodthan 60 sec spaced over not less than 10 min period

• Standard Deviation: more frequent samplingStandard Deviation: more frequent sampling

– Data ProcessingData Processing• 10-15 min averages for display in CR/TSC/EOF10-15 min averages for display in CR/TSC/EOF

• Hourly averages for climatic and dispersion analysesHourly averages for climatic and dispersion analyses

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• Data Base ManagementData Base Management– Representative Site Data BasesRepresentative Site Data Bases

•3-5 yrs of onsite data for dispersion calculations3-5 yrs of onsite data for dispersion calculations

– Data Validation TechniquesData Validation Techniques•Compare to expected range of values, Compare to expected range of values,

redundant sensors, other tower levels, other redundant sensors, other tower levels, other data sources, etc.data sources, etc.

– Data SubstitutionData Substitution•From redundant sensors, other tower levels From redundant sensors, other tower levels

(adjusted for change in height), linear (adjusted for change in height), linear interpolation for short periods of missing data, interpolation for short periods of missing data, etc.etc.

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• Data Base Management (cont’d)Data Base Management (cont’d)– Data Recovery RatesData Recovery Rates

•90% annually, individual channels and 90% annually, individual channels and composite WS/WD/DT joint frequency composite WS/WD/DT joint frequency distributionsdistributions

– Data ArchivingData Archiving•Retain raw data for 5 years, valid hourly Retain raw data for 5 years, valid hourly

data for life of facility data for life of facility

– Data ReportingData Reporting•Annual joint frequency distributionsAnnual joint frequency distributions

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• System PerformanceSystem Performance– System AccuracySystem Accuracy

•Wind Speed: ±0.2 m/s or 5% of observed; Wind Speed: ±0.2 m/s or 5% of observed;

•WindWind Direction: ±5° Direction: ±5°

•TemperatureTemperature: ±0.5°C: ±0.5°C

•Delta-T: ±0.1°CDelta-T: ±0.1°C

•DewDew Point: ±1.5°C Point: ±1.5°C

•Time ±5 minTime ±5 min

•Etc.Etc.

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• System Performance (cont’d)System Performance (cont’d)– System CalibrationsSystem Calibrations

• Encompass entire channel (from sensor to Encompass entire channel (from sensor to display/recorder)display/recorder)

• Preoperational and 6-month intervals thereafterPreoperational and 6-month intervals thereafter

• Document “as-found” and “as-left” resultsDocument “as-found” and “as-left” results

• Field versus laboratory calibrationsField versus laboratory calibrations

– System Protection, Maintenance & ServiceSystem Protection, Maintenance & Service• Protect against electrical faults, severe Protect against electrical faults, severe

environmental conditions, etc.environmental conditions, etc.

– Quality Assurance and DocumentationQuality Assurance and Documentation

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ANSI/ANS-3.11-2005ANSI/ANS-3.11-2005

• Appendixes Appendixes (for information only)(for information only)

– Supplemental MeasurementsSupplemental Measurements– Tower Siting in Complex TerrainTower Siting in Complex Terrain– Stability Class DeterminationStability Class Determination– Optional Site Selection TechniquesOptional Site Selection Techniques– Wind ComputationsWind Computations– Calibration PracticesCalibration Practices

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33rd rd Proposed Rev. 1 to RG Proposed Rev. 1 to RG 1.231.23• Part of ongoing overall effort to update Part of ongoing overall effort to update

regulatory guidance to support regulatory guidance to support expected new reactor applicationsexpected new reactor applications

• May include consideration of guidance May include consideration of guidance provided in ANSI/ANS-3.11-2005provided in ANSI/ANS-3.11-2005– Tower and instrument siting criteriaTower and instrument siting criteria– System accuracySystem accuracy– Data processing, recording, and displays Data processing, recording, and displays