ML18036A931

TVA 2012 - TN4923 - TVA 2012

ML18036A931
Person / Time
Site:	Clinch River
Issue date:	02/05/2018
From:	Tennessee Valley Authority
To:	Office of New Reactors
Fetter A
References
EDS-CRN, Rev 0001
Download: ML18036A931 (138)

Text

L98 160203 013 EDS-CRN Clinch River Nuclear Plant Rev. 0001 Module I Page 1 of 11 OVERVIEW Quality Related  ; Yes No Environmental Data Station Manual Effective Date Level of Use: Reference Use Prepared by: Kenneth G. Wastrack (EMA), Meteorologist Reviewed by:

Thomas E. Adkins (NPG), Manager, Emergency Date Preparedness Systems Concurred by:

Jeffery N. Perry (P&O) Senior Project Manager, SMR Date Technology Approved by:

Walter H. Lee III (NPG), Manager, Emergency Date Preparedness--REMIC Chairman

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 2 of 11 Revision Log Revision or Affected Change Effective Page Number Date Numbers Description of Revision/Change 0 All Initial Release

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 3 of 11 Table of Contents 1.0 PURPOSE ................................................................................................................................. 4 2.0 SCOPE ...................................................................................................................................... 5 3.0 RESPONSIBILITIES.................................................................................................................. 5 3.1 Radiological Environmental and Meteorological Instrumentation Committee (REMIC). .................................................................................................................................... 5 3.2 Small Modular Reactor Technology (SMR) ............................................................................... 5 3.3 Nuclear Power Group (NPG) ..................................................................................................... 6 3.3.1 Corporate Emergency Preparedness (EP) ................................................................. 6 3.3.2 Emergency Preparedness Field Support (EPFS) ....................................................... 6 3.3.3 Computer Process Engineering (CPE) ....................................................................... 6 3.4 Generation Group (GG) ............................................................................................................. 6 3.4.1 Inspection, Testing, Monitoring and Analysis; Environmental Monitoring & Analysis (EMA) ...................................................................................... 6 3.4.2 Inspection, Testing, Monitoring and Analysis; Instrumentation Engineering Services (IES) ........................................................................................ 7 3.4.3 Environmental Permits & Compliance; Environmental Nuclear Generation & Construction (ENG&C) ......................................................................... 7 4.0 REGULATORY AND REQUIREMENT INFORMATION ........................................................... 8 4.1 FAA Notification ......................................................................................................................... 8 4.2 Meteorological Requirements Matrix ......................................................................................... 8 4.3 Baseline Specifications .............................................................................................................. 8 4.4 Calibration Specifications........................................................................................................... 8 5.0 MATRIX OF QUALITY ASSURANCE REQUIREMENTS -

METEOROLOGICAL MONITORING ........................................................................................ 9 6.0 MAINTAINING THE EDS MANUAL ........................................................................................ 11

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 4 of 11 1.0 PURPOSE The Environmental Data Station (EDS) is the center for collecting and transmitting of meteorological data for TVA nuclear plants. The "Environmental Data Station Manual" provides both general and site-specific information necessary for effective operation. It serves as the primary site document in the meteorological procedure process as shown in Figure I-1.

Figure I-1 Meteorological Procedure Process

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 5 of 11 1.0 PURPOSE (continued)

The EDS Manual (1) documents detailed sensor specifications, (2) provides a detailed listing of error sources for each parameter, and (3) references calibration procedures. The EDS Manual is required by NPG-SPP-5.12, Meteorological Monitoring Program, as the source of technical information for each sites program.

2.0 SCOPE The scope of the EDS Manual is as follows:

• Technical

Reference:

The manual provides an overview of the EDS and interfaces with other systems, detailed equipment descriptions and specifications, and a technical reference index of both documents and support personnel.

• Regulatory Information: The manual documents regulatory and compliance information not described elsewhere. This includes general and site-specific information, compliance history, and permit limits.

• Supplemental Information: The manual provides a list of reference documents, error analysis, and a summary of organizational responsibilities.

NOTE EDS Manuals and associated requirements apply in their entirety to TVAs operating Nuclear Plants--Browns Ferry (BFN), Sequoyah (SQN), and Watts Bar (WBN).

Since many aspects are not currently active, only data collection and processing portions apply to non-operational plants--Bellefonte (BLN) and Clinch River (CRN).

3.0 RESPONSIBILITIES 3.1 Radiological Environmental and Meteorological Instrumentation Committee (REMIC).

REMIC is responsible for implementing the Augmented Quality Assurance Program (NPG-SPP-5.9, "Radiological Control and Radioactive Material Shipment Augmented Quality Assurance Program"), resolving problems, and ensuring adequate communication between organizations responsible for calibration, training on use, and using meteorological instrumentation. REMIC provides a forum to bring together data users and data providers for multiple plants to address common issues.

The charter for REMIC is an appendix to NPG-SDP-RCDP-12, Radiological Environmental and Meteorological Instrumentation Committee (REMIC) Procedure.

REMIC is also responsible for the overall direction of the water temperature monitoring and thermal compliance program at TVA nuclear plants.

3.2 Small Modular Reactor Technology (SMR)

The SMR Technology group provides overall guidance and oversight for the CRN meteorological monitoring program.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 6 of 11 3.3 Nuclear Power Group (NPG) 3.3.1 Corporate Emergency Preparedness (EP)

EP is responsible for administrative and senior technical oversight of the meteorological program to include evaluation of program compliance with existing and new requirements, evaluation and implementation of modifications to the program, and coordination necessary for implementation of the program.

The Emergency Preparedness Manager is the REMIC chairperson.

3.3.2 Emergency Preparedness Field Support (EPFS)

EPFS is responsible for the operation and maintenance of the data collection, computer, and data transfer systems. In addition, EPFS tests or calibrates the thermal compliance equipment and software, radiation, and meteorological equipment as required. EPFS keeps backup components for the important equipment to assure minimum downtime. EPFS contacts other organizations for help if needed in solving system problems. EPFS may contact contractors for assistance as needed.

The Emergency Preparedness Systems Manager is member of REMIC.

3.3.3 Computer Process Engineering (CPE)

CPE is responsible for the software used in the site computer, the networking software and hardware, the Remote Access Computer, and the callout system. CPE also helps to troubleshoot hardware and software problems on the site EDS computer systems. All EDS system software is developed, modified, and maintained according to NPG-SPP-2.6, "Computer Software Control."

A CPE Instrument Engineer is a member of REMIC.

3.4 Generation Group (GG) 3.4.1 Inspection, Testing, Monitoring and Analysis; Environmental Monitoring & Analysis (EMA)

EMA is responsible for providing meteorological technical support that includes maintaining a requirements matrix, maintaining specifications, inspecting monitoring facilities, and providing data summaries used in the Offsite Dose Calculation Manual (ODCM).

EMA also identifies monitoring problems and collects, processes, validates, reports, and archives meteorological data to meet Nuclear Regulatory Commission data recovery, accuracy, and reporting requirements.

An EMA Meteorologist is a member of REMIC.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 7 of 11 3.4.2 Inspection, Testing, Monitoring and Analysis; Instrumentation Engineering Services (IES)

IES is responsible for the design and installation of the data logging system, meteorological equipment, and data transfer equipment. IES provides help in troubleshooting equipment problems and is responsible for major repairs on some equipment. IES provides a central stock of temperature sensors and cables and a calibration facility for providing field personnel with calibrated (traceable to National Institute of Standards and Technology) temperature and wind sensors. IES also supplies adequate documentation and training for field personnel who will operate and maintain the monitoring and data transfer systems. IES provides support for the EDS data logger and data collection equipment. IES supplies and calibrates wind, air temperature, and solar radiation sensors.

The Data Acquisition & Testing Supervisor is a member of REMIC.

3.4.3 Environmental Permits & Compliance; Environmental Nuclear Generation & Construction (ENG&C)

ENG&C provides three key functions to sustain and improve environmental performance:

support to operations, permitting and compliance expertise, and regulatory interface.

The Corporate Senior Manager for Environmental Nuclear Generation & Construction is a member of REMIC.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 8 of 11 4.0 REGULATORY AND REQUIREMENT INFORMATION In addition to serving as a technical reference, this EDS Manual summarizes regulatory and requirement information.

4.1 FAA Notification The Federal Aviation Administration (FAA) must be notified of "any failure or malfunction that lasts more than thirty (30) minutes and affects a top light or flashing obstruction light regardless of its position" (FAA Advisory Circular, "Obstruction Marking and Lighting," AC 70/7460-1K).

4.2 Meteorological Requirements Matrix EMA maintains the Meteorological Requirements Matrix, according to ESR-SOP-9.3 (Maintaining Meteorological Monitoring Requirements Documentation for REMIC). This is an item-by-item listing of all the requirements that apply to the meteorological monitoring program, how the Baseline Specifications addresses each requirement (where applicable),

and a list of implementing documents.

4.3 Baseline Specifications EMA maintains the Baseline Specifications, according to ESR-SOP-9.3 (Maintaining Meteorological Monitoring Requirements Documentation for REMIC). The Baseline Specifications is a technical description of the hardware and software used in the meteorological monitoring program. This description identifies the critical features that must be satisfied and describes the required interfaces with other systems.

4.4 Calibration Specifications NPG approved specifications shall be provided to organizations on NPG's Acceptable Supplier List (ASL) that perform meteorological monitoring activities. The ASL process addresses basic QA requirements while specifications provided to the contractor by the client address any other QA requirements. IES provides instrumentation and support services and is on NPGs ASL (as TVA Central Laboratories Services).

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 9 of 11 5.0 MATRIX OF QUALITY ASSURANCE REQUIREMENTS -

METEOROLOGICAL MONITORING NPG-SPP-5.12, "Meteorological Monitoring Program," requires an Augmented Quality Assurance (QA) Program for the Meteorological Monitoring Program as defined in NPG-SPP-5.9, "Radiological Control and Radioactive Material Shipment Augmented Quality Assurance Program". This matrix identifies specific documents that address the QA program components.

Implementing QA Criteria **

Document(s)

• A B C D E F G H I J K L M N O P Q R Baseline Specifications X X N ESR-SPP-03.02 X X O X TVA-SPP-01.001 X X T TVA-SPP-31.01 X ET-SPP-03.01 A X ESR-SOP-9.2 X P X ESR-SOP-9.4 X P X ESR-SOP-9.5 X L Calibration Specs X X I X X EPFS-1 X X X X X X X C X X X X X X EPFS-2 A X EPFS-3 X X X B X X X EPFS-4 X X X L X X X EPFS-6 X X X E X X X EPFS-7 X X X X X EDS Manuals X X X X EDS Software Doc X Other Software Docs X NPG-SPP-2.6 X NPG-SPP-5.3 X NPG-SPP-5.9 (default) X X X NPG-SPP-5.12 X X X

• See next page for document titles.

• • QA Criteria:

A. Organization for Quality Assurance J. Test Control B. Procedures, Instructions, & Drawings K. Measurement and Test Equipment C. Document Control L. Handling, Storage, and Shipping D. QA Records M. Inspection, Test, and Operating Status E. Design Control N. Control of Maintenance F. Procurement and Material Control O. Adverse Conditions G. Inspection and Line Verification P. Indoctrination, Training, Qualification, and Certification H. Quality Assurance Assessments Q. Audits I. Control of Special Processes R. Computer Software and Data

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 10 of 11 5.0 MATRIX OF QUALITY ASSURANCE REQUIREMENTS -

METEOROLOGICAL MONITORING (continued)

NPG-SPP documents define requirements applicable to NPG as a whole and its suppliers.

In the absence of other documents, they describe implementing of requirements.

REQUIREMENTS DOCUMENTS (NPG Standard Programs and Processes):

NPG-SPP-2.6 Computer Software Control

• Defines software QA requirements for the meteorological monitoring program.

NPG-SPP-5.3 Chemistry Control

• Defines organization responsible for the meteorological monitoring program.

NPG-SPP-5.9 Radiological Control and Radioactive Material Shipment Augmented QA Program

• Defines overall requirements for the meteorological monitoring QA program.

NPG-SPP-5.12 Meteorological Monitoring Program

• Defines specific requirements applicable to meteorological monitoring program.

Implementing documents are all REMIC-related (either subject to REMIC approval, prepared by organizations represented on REMIC, or designated by REMIC as applicable implementing documents). These documents identify specific requirements applicable to meteorological monitoring or describe QA criteria implementation.

IMPLEMENTING DOCUMENTS (REMIC-Related):

Baseline Specs Baseline Specifications - Meteorological Monitoring for TVA Nuclear Plants ESR-SPP-03.02 Quality Assurance TVA-SPP-01.001 TVA Administration of Standard Procedures and Processes TVA-SPP-31.01 Records Management ET-SPP-03.01 Corrective Action Program ESR-SOP-9.2 Validation of Meteorological Data - NPG ESR-SOP-9.4 Inspection of Meteorological Facilities ESR-SOP-9.5 Providing Meteorological JFD and Other Outputs to NPG Calibration Specs NPG Specifications for calibration and instrumentation services (provided by I&TS)

EPFS-1 Administrative Control of Procedures and Distribution EPFS-2 Control Room Notification EPFS-3 Servicing of Meteorological Equipment at Environmental Data Stations EPFS-4 Environmental Data Station Meteorological Sensor Exchange EPFS-6 Calibration of Environmental Data Station Data Logger Channels EPFS-7 Radio and Meteorological Tower Inspection EDS Manuals Environmental Data Station Manuals:

• Browns Ferry

• Sequoyah

• Watts Bar

• Bellefonte

• Clinch River EDS Software Doc Current Documentation for EDS Meteorological Monitoring System

• Operability Test

• Software Requirements

• Verification & Validation Test Other Software Docs Software Documentation for Meteorological Data Applications

• JFD_SPLJFD

• XOQ145

• EXTRACT

• 1/U

• MESOPUFF

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module I Rev. 0001 Manual OVERVIEW Page 11 of 11 6.0 MAINTAINING THE EDS MANUAL The EDS Manual addresses several functions that change at differing times and rates.

Some changes require formal review and signoff before they can be implemented, while other changes (such as computer scan lists) can be issued without formal EDS Manual review. Therefore, instead of treating the EDS Manual as a single entity that must be reviewed (and approved) in its entirety whenever any change is required, the EDS manual is divided into individual modules. Module ownership is defined by program area and allows the review/approval process to be customized for the particular program.

The EDS Manual is divided into four modules:

Title Owner(s) Approval(s)

I Overview REMIC NGDC REMIC II Meteorological Monitoring REMIC NGDC REMIC III Water Temperature --- ---

Monitoring

< not applicable to CRN >

IV Station Data Scan Lists CPE REMIC (as needed)

Each module is revised and reviewed independently. The module owner is responsible for keeping the module up-to-date. This includes preparing draft module revisions, obtaining review of the revisions, and submitting revisions for distribution.

EDS-CRN Clinch River Nuclear Plant Rev. 0001 Module II-a Page 1 of 30 METEOROLOGICAL MONITORING Quality Related ; Yes No Environmental Data Station Manual Effective Date Level of Use: Reference Use Prepared by: Kenneth G. Wastrack (EMA), Meteorologist Reviewed by:

Thomas E. Adkins (NPG), Manager, Emergency Date Preparedness Systems Concurred by:

Jeffery N. Perry (P&O) Senior Project Manager, SMR Date Technology Approved by:

Walter H. Lee III (NPG), Manager, Emergency Date Preparedness--REMIC Chairman

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 2 of 30 Revision Log Revision or Affected Change Effective Page Number Date Numbers Description of Revision/Change 0 All Initial Release

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 3 of 30 Table of Contents 1.0 SCOPE AND FORMAT OF MODULE II.................................................................................... 4

2.0 INTRODUCTION

....................................................................................................................... 5 3.0 STATION AND EQUIPMENT DESCRIPTION .......................................................................... 6 3.1 Meteorological Tower................................................................................................................. 6 3.2 Grounding and Lightning Protection .......................................................................................... 6 3.3 Meteorological Sensors and Equipment .................................................................................... 7 3.4 Data Logger ............................................................................................................................. 14 3.5 Data Logger Operation and Equipment ................................................................................... 16 3.6 Uninterruptible Power Supply and Emergency Power Generator ............................................ 16 3.7 Remote Access Computer ....................................................................................................... 16 4.0 EQUIPMENT CALIBRATION AND MAINTENANCE ............................................................. 18 4.1 Calibration ................................................................................................................................ 18 4.2 Maintenance ............................................................................................................................ 19 4.3 Data Traceability ...................................................................................................................... 19 5.0 METEOROLOGICAL DATA PROCESSING, VALIDATION, AND REPORTING............................................................................................................................ 25 5.1 Development/documentation of Software ................................................................................ 25 5.2 Data Handling and Processing ................................................................................................ 25 5.3 Data Validation and Dissemination .......................................................................................... 25

6.0 REFERENCES

........................................................................................................................ 26 6.1 Vendor maintenance/instruction manuals ................................................................................ 26 6.2 Work procedures and instruction manuals ............................................................................... 27 6.3 Information documents ............................................................................................................ 27 7.0 ABBREVIATIONS AND DEFINITIONS ................................................................................... 28

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 4 of 30 1.0 SCOPE AND FORMAT OF MODULE II EDS Manual Module II (Meteorological Monitoring) contains an extensive amount of information that cannot be easily presented in a single document. Therefore, this module is divided into three parts:

A. Module II-a Introduction.

Station and Equipment Description.

Equipment Calibration and Maintenance.

Meteorological Data Processing, Validation, and Reporting.

References.

Abbreviations and Definitions.

B. Module II-b Accuracy of Meteorological Measurements.

C. Module II-c Site-specific Appendices.

All three parts of the Module are issued at the same time. Module II-a includes the Cover Page (with approval signatures) and the Revision Log for all three parts.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 5 of 30

2.0 INTRODUCTION

The Tennessee Valley Authority (TVA) Clinch River Nuclear Plant (CRN) Environmental Data Station (EDS) is located at the CRN site on the Clinch River portion of Watts Bar Lake.

A description of the meteorological site is given in Appendix A of Module II-c.

The EDS includes a 110-meter meteorological tower (although no data are collected above 60 meters), surface meteorological sensors, a computer-controlled data logger and associated equipment, and a building for equipment and personnel.

The meteorological monitoring site was selected so data can be collected that are representative of the general state of the atmosphere influencing the nuclear plant and surrounding areas. This requires selecting a site that is not adversely influenced by terrain, vegetation, obstructions, or activities near the site. Since changes often occur that will impact data collected at the site, periodic inspections are performed to ensure that data collected are still acceptable. These inspections are conducted annually by individuals, normally meteorologists, who are knowledgeable of conditions that might affect measurements. If adverse conditions are identified, appropriate corrective actions are taken or compensating measures are established.

Meteorological data are automatically collected at multiple levels on (or near) the tower; summarized into various formats; and transmitted to a Remote Access Computer (RAC) for further processing. Later, collected data are validated to document data quality and saved as permanent archival records. All automated instrumentation and equipment is checked and calibrated regularly to ensure continued correct operation of all system components.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 6 of 30 3.0 STATION AND EQUIPMENT DESCRIPTION 3.1 Meteorological Tower A single 110-meter meteorological tower is used at the EDS.

The tower has meteorological sensors mounted on the structure. It conforms to Telecommunications Industries Association Standard TIA-222-G, "Structural Standards for Steel Antenna Towers and Antenna Supporting Structures."

A. The tower will withstand the following simultaneous loads:

1. A horizontal wind pressure as specified in the Electronics Industries Association Code, TIA-222-G. This design load is for a wind velocity of 90 miles per hour (3-second gust), which is equivalent to a 50-year recurrence interval.

2. A vertical weight load of tower, guys, and equipment.

B. All members except bolts, nuts, washers, and guying hardware are hot dip galvanized in accordance with ASTM-A123 or ASTM-A153.

C. The tower is marked and lighted per FAA Advisory Circular 70/7460-1K, "Obstruction Marking and Lighting," for towers 300 to 450 feet in height.

1. The tower is painted with International Airways orange and white paint in accordance with Advisory Circular 70/7460-1K.

2. The lighting system includes lamps, insulated wiring in conduit, and a control unit enclosed in a waterproof metal cabinet. The control unit is mounted on the north side of the tower. The flashing code located on top of the tower rotates within the time specified by FAA specifications. In the event of flasher failure, the beacon lamps shall automatically turn ON and remain ON.

D. The tower is equipped with a ladder attached to one side of the tower. The ladder is furnished with a safety cable and two climbing belts as per TVA's Hazard Control Standard No. 608.

E. Tower inspection and maintenance is performed in accordance with EPFS-7. Formal inspections are scheduled at 3-year (ground-level inspection only), and 6-year (ground-level and on-tower inspections) intervals.

3.2 Grounding and Lightning Protection The 110-meter tower is grounded by three 5/8-inch diameter 8 foot long copperweld grounding rods within 3 feet of the tower base. The top of these rods is 6 inches below ground surface and interconnected with No. 2 or larger copper ground wire. Two rods are connected to two different legs of the tower.

A continuous run of No. 2 or larger stranded copper is attached at 10-foot intervals to one leg of the tower from the top of the tower to the ground rods at the base. All bonding of ground rods and ground wire are made by standard grounding compression fittings.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 7 of 30 3.2 Grounding and Lightning Protection (continued)

All equipment mounted on the tower shall be connected to the copper ground wire so that it will be effectively grounded.

The guy cables are grounded through their respective guy anchors are connected to a 5/8-inch diameter, 8-foot ground rod. The ground rod should be driven into the ground until the top is at least 6 inches below the surface.

The ground rods at the base of the tower are connected to the ground rods at each anchor with the same size stranded copper wire as used on the tower. The ground wire is buried 18 inches below ground surface.

3.2.1 Lightning/electrical protection Lightning/electrical protection against damage to the computer through the sensor lines is provided to the computer in one of two ways.

A. Most of the sensor signals are transmitted to the computer through the Agilent data acquisition switch unit. This device provides a protective interface.

B. Wind sensor signal lines are directly wired to the computer. In-line optical isolators provide protection for the electrical pathway.

3.3 Meteorological Sensors and Equipment Sensors for wind direction/speed, air temperature, and dewpoint are mounted at the 10-meter and 60-meter levels. See Table II-1 for manufacturer specifications. The pyranometer and rain gauge are located near the tower, with sensor inputs approximately one meter above ground.

Automated meteorological data processing consists of scanning instantaneous meteorological variables and executing a computer program that calculates summary results. Table II-2 lists the meteorological variables that are scanned, their scan periods, and scaling calculations (to convert from electrical units to meteorological units). Table II-3 identifies the range, resolution, limit check, normal number of interrogations, minimum number of interrogations required for valid record, and the data processing calculations for each variable.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 8 of 30 3.3 Meteorological Sensors and Equipment (continued)

TABLE II-1 METEOROLOGICAL SENSORS All instrumentation and measurements meet RG-1.23 (Revision 1) and ANSI/ANS-3.11 (2005) requirements, except as described below.

Sensor Level, meters

• Manufacturer Sensor Specifications Wind Direction (WD) 10, 60 Vaisala Model 425 ultrasonic wind sensor; starting threshold, 0 mph and WD: Resolution, 1°; range, 0 to 360°; accuracy +/-2°.

Wind Speed (WS) WS: Resolution, 0.1 mph; range, 0 to 144 mph; accuracy +/-0.3 mph or 3% of reading, whichever is greater.

Ambient Air 10, 60 Weed Instrument Company, Model 101, R0 = 100 RTD Temperature (platinum Temperature wire resistance temperature detector) mounted in motor-fan aspirated solar radiation shield, R. M. Young, Co. model 43408.

Sensor: Data recording range -30.0 to 120.0°F; RTD stability, +/-0.25°F/year; RTD repeatability, +/-0.25°F; time response, 5 seconds.

Aspirated Shield: Maximum radiation error, 0 to +0.4°F; delta-T error, +/-0.1°F with like shields; aspiration flow rate, 3.5 to 7.6 m/s.

Dewpoint Temperature 10, 60 Vaisala, Model HMT337 Humidity and Temperature Transmitter for High Humidity Applications; capacitive humidity sensor with warmed probe head mounted in aspirated radiation shield, R.M. Young Model 43502.

Sensor: Temperature range, -70 to +180°C; measurement range, 0 to 100%

RH, factory calibration uncertainty, +/-0.6% RH for 0...40% RH and +/-

1.0% for 40...97% RH.

Aspirated Shield: Aspiration flow rate, 5 to 10 m/s.

Solar Radiation 1 Eppley Laboratories Model 8-48 Pyranometer; sensitivity = 0.001 ly/min 2

(based on 10 V =1 W/m ); temperature dependence = +/-1.5%; linearity +/-1%

2 from 0.00 to 1400 W/m (2.01 ly/min); response time 5 seconds; cosine response +/-2% from 0 to 70°, +/-5% from 70 to 80°.

Rainfall 1 Sutron Corporation, Model 5600-0420-1h; heated tipping bucket rain gauge.

Accuracy +/-0.5% at 0.5 inch/hour and +/-2.0% at 2 inches/hour; sensitivity, +/-0.01 inches; resolution 0.01 inch.

• Sensor elevations indicated are approximations of actual sensor heights. See Module II-c (Appendix A) for actual sensor heights.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 9 of 30 3.3 Meteorological Sensors and Equipment (continued)

TABLE II-2 METEOROLOGICAL VARIABLES SCANNED Period Scaling Calculations Variable Between Scans ( X = value of measurement)

Wind Direction 5 seconds Wind Direction (° azimuth) = X Wind Speed 5 seconds Wind Speed (mph) = X Air Temperature 5 seconds Air Temperature (°F) = 1.8 * (TC ) + 32 TC = T1 + A T1 2 T1 A = K 2

• 100 100 100 * (R T R 0 )

T1 =

K1 RT = resistance of RTD as measured by DASU = X R0 = constant (ice point resistance)

K1 and K 2 = constants TC = temperature in °C Dewpoint Temperature 5 seconds Dew Point Temperature (°F) = (X volts 11.125) 26.25 Rainfall 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, 15 minutes Rainfall (inches) = 0.01 * (countsafter - countsbefore)

Solar Radiation X millivolts X 5 seconds Solar Radiation (ly/min) = =

millivolts / (ly min ) 7.26 (1 ly = 1 g-cal/cm2)

Note: 7.26 is an example value. Actual values are supplied with the individual sensor.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 10 of 30 3.3 Meteorological Sensors and Equipment (continued)

TABLE II-3 METEOROLOGICAL DATA PROCESSING Variable Valid Input Range Resolution Output Limit Check Wind Direction n/a (digital input) 1° 0° to 359° Wind Speed n/a (digital input) 0.1 mi/hr 0.0 to 99.9 mi/hr Air Temperature 86 to 120 ohms 0.01 °F -30.00 to 120.00 °F Dewpoint Temperature 2.000 to 5.300 volts 0.01 °F -4.00 to 85.00 °F Solar Radiation -0.02 to 30.0 mVolts 0.01 ly/min 0.00 to 3.00 ly/min Rainfall n/a (frequency count) 0.01 inches H2O 0.00 to 10.00 inches H2O Interrogations Hourly 15-Minutes Variable Normal Min

• Normal Min

• Calculations Vector Wind Direction 720 180 180 45 (WS

• sin WD) arctan (WS

• cos WD)

Vector Wind Speed 720 180 180 45

[(WS

• sin WD) 2

+ (WS

• cos WD) 2

]

n

({ } ) ({WD WD})

Sigma Theta ** 720 540 180 135 WD WD 2 2 n

n 1 Average Wind Speed 720 180 180 45 WS n Individual Interrogations WD - Wind Direction Air Temperature 720 180 180 45 AT n WS - Wind Speed AT - Air Temperature DP - Dewpoint Temperature Dewpoint Temperature 720 180 NA NA DP n SR - Solar Radiation RFi - Rainfall (current)

Solar Radiation 720 180 NA NA SR n RFi 1 - Rainfall (previous) n = number of interrogations Rainfall 1 *** 1 *** 1 *** 1 *** RF

• Minimum number of readings required for a valid sample.

• • Sigma theta is calculated using observed wind direction individual values.

• • • Rainfall is also interrogated once every 15 minutes.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 11 of 30 3.3.1 Wind direction/speed sensor The wind direction/speed sensor uses the speed of an ultrasound signal across a known distance to determine wind speed and direction.

A. The Vaisala Model 425 ultrasonic wind sensor determines wind direction and speed based on the transit time for sound to travel from one transducer to another. The sensor determines the transit time along three horizontal axes (offset by 120 degrees with respect to each other). Using the transit times, the sensor determines the wind speed along each axis. The sensor then computes the wind speed and direction and reports them to the data logging system.

B. Calibrations of wind sensor data logger channels are performed in accordance with EPFS-6.

3.3.2 The ambient air temperature sensor The ambient air temperature sensor is a platinum resistance thermometer whose resistance is a linear function of temperature. The temperature sensor is mounted in a motor aspirated temperature shield.

A. Motor-aspirated shields containing platinum temperature sensing elements (RTD's) are used to measure temperatures, at selected levels on the meteorological tower.

Platinum RTD's are used because of their excellent stability.

B. The motor-aspirated shield is designed to protect the air temperature probe from solar and terrestrial radiation, while drawing a representative sample of ambient air over the probe. The air is drawn in by an aspirator motor and fan. The air temperature probe is mounted in the center of two coaxial shields or tube units. These tubes are separated by an open space through which air is free to pass. While the aspirator motor fan draws a sample of air over the temperature probe, it also "scrubs" the surface of the tubes, breaking the air boundary layer at each surface and reducing heat transfer by radiation and convection to the inner shield.

C. The ambient air temperature probe is a platinum element mounted on a ceramic bobbin, covered by aluminum oxide insulation and a stainless steel sheath. The normal resistance is 100 ohms at the freezing point (32°F) and varies directly with temperature, approximately 0.22 ohm/°F of temperature change. The probe's operating range is quite large. However, the data recording equipment accepts temperature data only within the range of -30 to +120°F. Any values outside this range will be recorded as LR (i.e., lost record) by the data logger.

D. Each temperature probe is connected to the data logging equipment by four wires.

Two of the wires provide a circuit for the constant current (1 mA) which flows through the resistance of the probe. The other two wires are used to measure the voltage drop across the probe. If the current source is constant and the voltage reading device has a very high input impedance, the lead resistance between the data logging equipment and the probe does not affect the reading in a four-wire system.

E. The air temperature sensors are sent to the field after being calibrated. Calibrations of air temperature sensor data logger channels are performed in accordance with EPFS-6.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 12 of 30 3.3.3 Dew point temperature sensor NOTES ABOUT DEWPOINT MEASUREMENTS Measurement of atmospheric dewpoint presents special challenges because the state of water changes (i.e.

freezes) within the normal sampling range. The relationship between dewpoint (32°F and higher) and frost point (below 32°F) cannot be represented by a single linear equation because the calibration curves are different. Frost point does not apply above 32°F, and is always higher below 32°F.

The following table shows the relationship between the two variables.

Frost Point (°F) Dewpoint (°F) Frost Point (°F) Dewpoint (°F) Frost Point (°F) Dewpoint (°F) 32 32.0 20 18.5 8 5.2 30 29.7 18 16.2 6 2.9 28 27.5 16 14.0 4 0.7 26 25.2 14 11.8 2 -1.5 24 22.9 12 9.6 0 -3.7 22 20.7 10 7.4 -2 -5.8 For temperatures below 32°F, it is not always certain which variable (dewpoint or frost point) is being measured and reported by the sensor because of the sensor characteristics.

• Chilled-mirror sensors measure dewpoint directly by determining the temperature at which a mirror is covered by dew (and does not reflect light). For values below freezing, the mirror is normally covered by frost rather than dew, so the sensor reports the frost point value as the dewpoint. However, for some values just below 32°F, water may still be in liquid form, so the dewpoint is reported.

• Capacitive humidity sensors measure relative humidity and convert to dewpoint. For values below 32°F, the relative humidity will be based on frost point, so frost point will be reported instead.

Historically, TVA has not been concerned with frost point values.

• Only dewpoints at the high end of the measurement range were of concern because of impacts on cooling tower operations.

• Calibration standards did not work for values below 32°F.

Because the sensors are not calibrated below 32°F, it is assumed that the sensors accurately operate below 32°F. Data users are responsible for recognizing that dewpoint values below 32°F are more likely to be frost point.

The dewpoint temperature system utilizes a capacitive humidity sensor with warmed probe head. The transmitter and the warmed head probe are mounted at the 60- and 10-meter level on the meteorological tower.

A. The Vaisala Humidity and Temperature Transmitter HMT337 warmed probe maintains a temperature difference between the probe head and external environment to avoid condensation on the sensor (since a wet probe cannot observe the actual humidity in the ambient air). Even though the temperature is higher than the environment, the dewpoint remains the same.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 13 of 30 3.3.3 Dew point temperature sensor (continued)

B. The HMT337 probe head also contains a heater that speeds up the recovery of the sensor from condensation. The heater is configured to operate with the following default settings.

1. Start Threshold = 95% Relative Humidity.

2. Heating Duration = 30 seconds.

3. Heater Temperature = 100°F.

C. The HMT337 provides reliable humidity measurement in wide range of applications.

The transmitter can be configured to measure, calculate, and output dewpoint as an analog signal.

D. Although the Vaisala Humidity and Temperature Transmitter has a full range of -94°F to +356°F, the system is operated to measure only the normal range of atmospheric dewpoint temperatures based on site climatology. Consequently, the data logging equipment accepts only dewpoint temperatures within the range of -4°F to +85°F (which corresponds to sensor output of 2.000 to 10.000 V).

E. Because of problems associated with dewpoint versus frost point, the actual sensor calibration range is +34°F to +86°F.

F. Calibration of the dewpoint sensor is performed according to [CLS] 605.01-004.

Calibration of dewpoint temperature channel is performed in accordance with EPFS-6.

3.3.4 Solar Radiation Sensor The 180-degree pyranometer measures the total sun and sky radiation received on a horizontal surface. The pyranometer detects radiation by means of a differential thermopile.

The thermocouple hot-junctions contact blackened surfaces and the cold-junctions contact whitened surfaces that alternate in a radial pattern.

A. The Eppley Model 8-48, 180° pyranometer measures solar radiation received on a horizontal surface. The detector is a differential thermopile enclosed in a precision ground, optical glass envelope with the hot-junction receivers blackened and the cold-junction receivers whitened. A network, consisting of a thermistor and two resistors, mounted internally, provides temperature compensation from -20°C to +40°C

(-4°F to +104°F).

B. The Eppley Pyranometer is sent to the field after being calibrated at the factory by the vendor yearly. Semiannual field calibration is performed in accordance with EPFS-6.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 14 of 30 3.3.5 Rain Gauge The rain gauge is a tipping-bucket type, which reports precipitation in 0.01-inch increments.

A. Mechanical--The rain gauge collects rainfall within an 8-inch diameter area created by the knife-edge collector portion of the sensor. Collected water is funneled to a mechanical device (tipping bucket), which incrementally measures the accumulation and causes the momentary closure of a switch for each increment. The tipping bucket is designed to measure in increments of 0.01 inch of rain. As water is collected, the tipping bucket fills to the point where it tips. This action empties the bucket in preparation for additional measurements, closes the momentary switch, and signals another 0.01 inch of precipitation.

B. Electrical--A continuous 5-volt signal is provided to the rain gauge, but since the circuit is normally open so no signal is transmitted. When the bucket tips, the circuit is momentarily closed and a pulse is transmitted.

C. Output--Rainfall amounts are determined by counting the number of pulses during a period of time (either 15 minutes or 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />) and multiplying by 0.01 inch. To determine total rainfall over a given period of time, add the individual 15-minute or hourly values within the period.

D. Rain gauges are calibrated in accordance with EPFS-6.

3.4 Data Logger The data logger collects, processes, transmits, and records meteorological and hydrological data. See Figure II-1 for a flowchart of the meteorological data users.

The data logger system (Module II-c, Figure IIC-2) at the EDS consists of a Microsoft Windows' based server running a Digital Equipment Corporation (DEC) VAX/VMS real time emulator, an instrument multiplexer, a data acquisition switching unit and communications equipment. The server also has two network connections to the TVA Wide Area Network (WAN). One WAN connection is dedicated to the Microsoft Windows' server and the other WAN connection is dedicated to the VAX emulator.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 15 of 30 3.4 Data Logger (continued)

Figure II-1 EDS DATA FLOW EDS Data Web Sites Unvalidated Data TVA Eternal EDS FTP Server (http://cegnet1/edscombined/)

Computer 15-minute & (info.tva.gov) 1-hour Data Summaries

`

Cellular Modem Remote (always connected) Access Computer On-demand The data logger scans individual User Access DATA meteorological data values: VALIDATION Unvalidated Wind Speed - 5 seconds Data Wind Direction - 5 seconds Air Temperature - 5 seconds Dewpoint - 5 seconds Environmental Archival Solar Radiation - 5 seconds Rainfall - Instantaneous Monitoring & Validated (each 15 min.) Analysis Data Fig. CR_II-1 Engineering Design Site Licencing Climatological Reviews Weather-related FSAR input design input General Use Other Nuclear Power Data Users

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 16 of 30 3.5 Data Logger Operation and Equipment All data logger functions are controlled by the computer program. The output of each meteorological sensor connected by cable to the logger, is scanned periodically, scaled, and stored in the computer.

A. The Agilent 34970A Data Acquisition Switch Unit is used to select the desired analog (sensor) input and convert all analog input signals to a digital form for processing by the computer. The unit has high accuracy and resolution, and is controlled remotely by digital signals from the computer. This allows the computer to control the scale, range, and frequency of measurement. Front panel controls and display allow manual use during maintenance and calibration activities.

The Agilent Data Acquisition Switch Unit is a microprocessor controlled instrument that can measure voltage, current, and resistance over a wide number of ranges. Range, functions and trigger rate are set remotely by the DEC Computer. Resistance measurements are made utilizing the standard four-wire technique.

The Agilent Data Acquisition Switch Unit includes two plug-in modules.

1. A 20-Channel Multiplexer module (module 34901A) scans electrical resistance and voltage signals from temperature, dewpoint, and solar radiation sensors.

2. A Multifunction module (module 34907A) counts rain gauge tips.

The data are recorded on magnetic disc and periodically transferred to and offsite computer.

Data are transferred using an always-connected" cellular modem, a TVA public access external FTP server, and the TVA wide area network (WAN).

3.6 Uninterruptible Power Supply and Emergency Power Generator 3.6.1 The uninterruptible power supply system (UPS)

The uninterruptible power supply system (UPS) is a microcomputer controlled dc-to-ac converter that has the capacity to maintain the instrumentation power load up to 30 minutes.

In normal operating mode (normal utility power supplied), the UPS is conditioning line power to remove spikes, sags, surges, and noise. When utility power fails, the UPS provides ac power from its internal batteries.

3.6.2 Emergency power generator This section is not applicable since no emergency power generator is currently installed.

3.7 Remote Access Computer The EDS data logger is linked to a computer network in Chattanooga that provides secure and high speed data transfers from the EDS system. Meteorological data collected at the EDS is available in near real time to technical users. EDS programmers have read and write access to data files and programs stored on the EDS minicomputer and can manage the EDS system remotely via this computer network.

The Remote Access Computer (RAC) is a central location for all EDS information.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 17 of 30 3.7 Remote Access Computer (continued)

• For general users, information available on the RAC includes the current scan sheets and raw meteorological data in real time. Data are available by internet access on TVA InsideNet using http://cegnet1/edscombined/.

• For data validation, the hourly and 15-minute data streams can be downloaded from the RAC using anonymous FTP.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 18 of 30 4.0 EQUIPMENT CALIBRATION AND MAINTENANCE The inspection, servicing, and maintenance program for meteorological instrumentation and associated equipment has the overall objective of ensuring an annual joint data recovery of 90 percent for atmospheric stability (T, temperature difference), wind speed, and wind direction at levels representing effluent release points.

4.1 Calibration A. A schedule of calibration due dates is maintained at the responsible field office. All signal processing units, and the rain gauge are calibrated in place. The DASU, wind sensors, air temperature sensors, the dewpoint temperature sensor, and Eppley pyranometer are exchanged and calibration is performed elsewhere.

B. All sensor calibrations are performed using quality assurance procedures and instrument lab calibration procedures (according to NPG Specifications for calibration and instrumentation services). Surveillance Instructions are performed using instructions written and maintained by nuclear plant personnel. Reporting forms are illustrated in each procedure.

C. Sonic wind sensors, air temperature sensors, and dewpoint sensors shall remain in service no longer than 184 days or beyond the calibration due date, whichever comes first. Eppley pyranometers shall be exchanged within one year of the last calibration.

Rain gauges are not routinely exchanged.

D. The following calibration standards and methods are used in the meteorological monitoring program.

Wind Sensor Calibrations are performed in a wind tunnel.

• Speed

• Anemometer (NIST certified)

• Direction

• Sonic Wind sensor (NIST certified)

Temperature sensors Certified platinum resistance thermometer (PRT)

Solar radiation sensors Manufacturer standard (factory calibrated)

Dewpoint temperature Calibration in laboratory environmental chamber.

Rain gauge Known amount of water (enters the sensor at a rate of approximately 2 inches per hour).

Digital voltmeters Direct voltage calibrator (Manufacturer certification)

Resistance calibrator (Manufacturer certification)

Standard resistors (Manufacturer certification)

Frequency meters Frequency measurement system (Manufacturer certification)

DC voltage standards DC reference standard (Manufacturer certification)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 19 of 30 4.2 Maintenance A. The EDS is routinely serviced a minimum of bi-weekly according to EPFS-3.

B. The tower maintenance and inspection is performed according to EPFS-7.

C. Non-routine maintenance is performed whenever necessary. An adequate spare parts inventory is maintained to minimize extended periods of system outage. This includes a spare EDS computer, spare sensors, and spare equipment components.

4.3 Data Traceability Meteorological data traceability is documented through calibrations and data checks that encompass entire data channels (from sensors to data displays or validated data).

Meteorological data are transmitted from five different types of sensors through the data logger computer to the users:

Sensors Users Wind Digital Remote Access (2 levels) Signal Data Computer (RAC)

Logger Computer Temperature Data Validation (2 levels) PC Data Dewpoint Analog Acquisition Meteorological (2 levels) Signal Switch Unit Data Archives (DASU)

Solar Radiation Counter Rainfall Sensors and equipment are calibrated or replaced at least every six months of service (except for solar radiation sensors, which are replaced annually).

• Wind sensors, air temperature sensors (RTDs), dewpoint sensors, and Data Acquisition Switch Unit (DASU) remain in service no longer than 184 days or beyond the calibration due date, whichever comes first. Solar radiation sensors (Eppley cells) are exchanged within one year of the last calibration. Rain gauge sensors are not routinely exchanged, but are calibrated in place.

• Channel calibrations are performed every 184 calendar days of service, and as required when maintenance is performed.

• Checks of the Archival data channel are performed each workday.

Figure II-2 illustrates the meteorological measurement traceability for each variable. Tables II-4a through II-4e list the data channel segments for each variable and summarize the documentation and standards that apply to each segment.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 20 of 30 4.3 Data Traceability (continued)

Figure II-2 METEOROLOGICAL MEASUREMENT TRACEABILITY Known Test TVA External Wind Tunnel FTP Server

• [WS] NIST anemometer Data (to ICS)

(info.tva.gov)

• [WD] NIST sonic wind sensor DATA WIND LOGGER SENSORS Known Amount of Water DATA Remote ACQUISITION Access RAINFALL SWITCH UNIT Computer SENSOR (DASU) (RAC)

Temperature CALIBRATION Channel PANEL Calibrator Temperature Bath

• Lab temp standard Data Measuring &

Validation Test Equipment TEMPERATURE PC SENSORS NOTE Data transfer to the Test signals RAC, Data Archives, Environmental (from sensor) and CECC Computer Chamber is not verified by calibrations, but is DEWPOINT discussed in SENSOR applicable software Data documentation. Archives Calibrated by Manufacturer Calibration Standards SOLAR RAD.

Fig. CR_II-2 SENSOR

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 21 of 30 4.3 Data Traceability (continued)

Table II-4a METEOROLOGICAL DATA CHANNEL CHECK/CALIBRATION (WIND)

Channel Segment Relevant Procedure(s)

• Checks/Calibrations **

Sensor to TVA Met Data Archives Sensor 450.01-019 Wind Tunnel NIST-traceable anemometer NIST-traceable sonic wind sensor Sensor Channel to Data Logger EPFS-4 Margin Verifier Device Data Logger EPFS-4 Verification of digital output EPFS-6 Verification of known test data Data Logger to Remote Access Computer MET_SRS_SDD *** ---

(RAC)

RAC to TVA Met Data Archives ESR-SOP-9.2 Manual data comparison

• The procedure titles are listed after Table II-4e.

• • Standards are indicated by .

• • • Data transfer to the RAC and TVA Met Data Archives is not verified by calibrations, but is discussed in applicable software documentation and procedures.

Table II-4b METEOROLOGICAL DATA CHANNEL CHECK/CALIBRATION (TEMPERATURE)

Channel Segment Relevant Procedure(s)

• Checks/Calibrations **

Sensor to TVA Met Data Archives Sensor 450.01-005 Temperature Bath Lab. Standard Thermometer Sensor Channel to Data Logger 450.01-011 Temp. Channel Calibrator 450.01-014 Measuring and Test Equipment EPFS-4 (M&TE)

Data Logger EPFS-4 Verification of digital output EPFS-6 Known Test Data Data Logger to Remote Access Computer MET_SRS_SDD *** ---

(RAC)

RAC to TVA Met Data Archives ESR-SOP-9.2 Manual data comparison

• The procedure titles are listed after Table II-4e.

• • Standards are indicated by .

• • • Data transfer to the RAC and TVA Met Data Archives is not verified by calibrations, but is discussed in applicable software documentation and procedures.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 22 of 30 4.3 Data Traceability (continued)

Table II-4c METEOROLOGICAL DATA CHANNEL CHECK/CALIBRATION (DEWPOINT)

Channel Segment Relevant Procedure(s)

• Checks/Calibrations **

Sensor to TVA Met Data Archives Sensor 504.02-001 Laboratory Environmental Chamber Sensor Channel to Data Logger 450.01-014 (Included in sensor calibration)

Data Logger EPFS-6 Verification of digital output Data Logger to Remote Access Computer MET_SRS_SDD *** ---

(RAC)

RAC to TVA Met Data Archives ESR-SOP-9.2 Manual data comparison

• The procedure titles are listed after Table II-4e.

• • Standards are indicated by .

• • • Data transfer to the RAC and TVA Met Data Archives is not verified by calibrations, but is discussed in applicable software documentation and procedures.

Table II-4d METEOROLOGICAL DATA CHANNEL CHECK/CALIBRATION (RAINFALL)

Channel Segment Relevant Procedure(s)

• Checks/Calibrations **

Sensor to TVA Met Data Archives Sensor EPFS-6 Known Amount of Water (calibration bottle)

Sensor Channel to Data Logger EPFS-6 (Included in sensor calibration)

Data Logger EPFS-6 Verification of digital output Data Logger to Remote Access Computer MET_SRS_SDD *** ---

(RAC)

RAC to TVA Met Data Archives ESR-SOP-9.2 Manual data comparison

• The procedure titles are listed after Table II-4e.

• • Standards are indicated by .

• • • Data transfer to the RAC and TVA Met Data Archives is not verified by calibrations, but is discussed in applicable software documentation and procedures.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 23 of 30 4.3 Data Traceability (continued)

Table II-4e METEOROLOGICAL DATA CHANNEL CHECK/CALIBRATION (SOLAR RADIATION)

Channel Segment Relevant Procedure(s)

• Checks/Calibrations **

Sensor to TVA Met Data Archives Sensor EPFS-4 Calibrated by Manufacturer Sensor Channel to Data Logger 450.01-014 Measuring and Test Equipment EPFS-4 (M&TE)

EPFS-6 Data Logger EPFS-6 Verification of digital output Data Logger to Remote Access Computer MET_SRS_SDD *** ---

(RAC)

RAC to TVA Met Data Archives ESR-SOP-9.2 Manual data comparison

• The procedure titles are listed after Table II-4e.

• • Standards are indicated by .

• • • Data transfer to the RAC and TVA Met Data Archives is not verified by calibrations, but is discussed in applicable software documentation and procedures.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 24 of 30 4.3 Data Traceability (continued)

PROCEDURES REFERENCED IN TABLES II-4a THROUGH II-4e:

Instrumentation Engineering Services (IES) Procedures - Generic for all plants

• 450.01-005 - Calibration of Air Temperature Sensors - Nuclear

• 450.01-011 - Certification of Temperature Channel Calibrators

• 450.01-014 - Calibration of Meteorological Monitoring Process Digital Voltmeters

• 450.01-019 - Calibration of Vaisala WAS425 Ultrasonic Wind Sensor

• 504.02-001 - Temperature and/or Humidity Recorders and Indicators Emergency Planning Field Support (EPFS) Procedures - Generic for all plants

• EPFS Environmental Data Station Meteorological Sensor Exchange

• EPFS Calibration of Environmental Data Station Data Logger Channels Computer Process Engineering (CPE) Software Documentation - Plant-specific

• MET_SRS_SDD - Meteorological Software Program (MET) - Software Requirements Specification and Design Document Environmental Monitoring & Analysis (EMA) [previously Environmental Science and Resources (ESR)] Procedures - Generic for all plants

• ESR-SOP-9.2 - Validation of Meteorological Data - Nuclear

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 25 of 30 5.0 METEOROLOGICAL DATA PROCESSING, VALIDATION, AND REPORTING 5.1 Development/documentation of Software CPE develops, tests, documents, and oversees installation of software used in the meteorological monitoring program. This includes verifying the proper operation of software prior to implementation by means of benchmark testing and/or independent reviewers. In addition, CPE prepares and distributes software documentation and ensures adequate control and security of software used for online data processing (e.g., data logger and data validation software). REMIC is the owner of the software and CPE maintains applicable documentation.

5.2 Data Handling and Processing CPE operates the RAC that receives data from plant data loggers for further processing.

EMA accesses the RAC for validation of meteorological data. EMA identifies problems and notifies appropriate personnel.

5.3 Data Validation and Dissemination EMA reviews meteorological data to identify possible data problems and notify appropriate personnel. EMA validates all meteorological data before it is placed into permanent archival storage to ensure that the amount of valid data in the master record meets regulatory requirements for minimum data collection. Validation includes running data validation software as an aid to review of raw data, identifying and editing questionable or invalid data, recovering data from backup sources, and adjusting data to reflect calibration results.

EMA provides meteorological data to specific users either routinely or on request.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 26 of 30

6.0 REFERENCES

All references are most recent revisions unless noted otherwise.

6.1 Vendor maintenance/instruction manuals 6.1.1 Data Acquisition Switch Unit A. AGILENT 34970A Data Acquisition/Switch Unit User's Guide, P/N 34970-90002, Agilent Technologies Company, November 1999 B. HP 34970A Data Acquisition/Switch Unit Quick Reference Guide, P/N 34970-90007, Hewlett-Packard. Company, October 1997 Note: Agilent was part of Hewlett-Packard until 1999.

6.1.2 Wind Speed and Direction A. Users Guide, Vaisala WINDCAP Ultrasonic Wind Sensor WS425, Vaisala, 2010.

6.1.3 Temperature Aspirated Radiation Shield A. Instruction Manual, Model 43408 Gill Aspirated Radiation Shield, R. M. Young, Co.,

March 1995.

6.1.4 Dew Point Temperature A. Users Guide, Vaisala HUMICAP Humidity and Temperature Transmitter Series HMT330, Vaisala, November 2004.

6.1.5 Pyranometer A. "Black and White Pyranometers, Installation, Operation, and Maintenance", The Eppley Laboratory, January 1, 1970 B. "Instrumentation for the Measurement of the Components of Solar and Terrestrial Radiation", The Eppley Laboratory 6.1.6 Rain Gauge A. Sutron 5600-0420-1H Users Guide

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 27 of 30 6.2 Work procedures and instruction manuals 6.2.1 Emergency Planning Field Support Procedures A. EPFS-3, "Servicing of Meteorological Equipment at Environmental Data Stations" B. EPFS-4, "Environmental Data Station Meteorological Sensor Exchange" C. EPFS-6, "Calibration of Environmental Data Station Data Logger Channels" D. EPFS-7, "Radio and Meteorological Tower Inspection" 6.2.2 Laboratory Calibration Procedures Applicable laboratory procedures are internal documents maintained by IES. The specific requirements for meteorological instruments and related equipment are included in Calibration Specifications provided to IES by REMIC.

6.2.3 Environment and Technology Procedures These procedures are available from EMA.

A. ESR-SOP-9.2 - Validation of Meteorological Data - Nuclear B. ESR-SOP-9.4 - Inspection of Meteorological Facilities 6.3 Information documents A. Environmental Data Station Network Maintenance Manual, CPE B. SPP-2.6, "Computer Software Control" -- standard for NPG software QA C. "Quality Assurance Handbook for Air Pollution Measurement Systems: Volume IV.

Meteorological Measurements," EPA-600/4-82-060, February 1983, U.S.

Environmental Protection Agency, Environmental Monitoring Systems Laboratory.

D. SPP-5.12, "Meteorological Monitoring Program".

E. ANSI/ANS-3.11-2005, "Determining Meteorological Information at Nuclear Facilities,"

December 2005, American Nuclear Society.

F. RG-1.23 (Revision 1), Meteorological Monitoring Programs for Nuclear Power Plants, March 2007, Nuclear Regulatory Commission

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 28 of 30 7.0 ABBREVIATIONS AND DEFINITIONS ac - alternating current ACI - American Concrete Institute ANSI - American National Standards Institute ANS - American Nuclear Society ASTM - American Society for Testing and Materials

°C - degrees Celsius CPE - Computer Process Engineering CPU - central processing unit CRN - Clinch River Nuclear Plant DASU - Data Acquisition Switch Unit dc - direct current DCRM - Document Control Records Management DEC - Digital Equipment Corporation DVM - digital voltmeter (digital multimeter)

EDS - Environmental Data Station EMA - Environmental Monitoring and Analysis EPFS - Emergency Preparedness Field Support FAA - Federal Aviation Administration

°F - degrees Fahrenheit ft - foot, feet Gbyte - gigabyte Hz - hertz IES - Inspection Engineering Services IEEE - Institute of Electrical and Electronics Engineers JFD - Joint Frequency Distribution Kbyte - kilobyte

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 29 of 30 7.0 ABBREVIATIONS AND DEFINITIONS (continued)

Kohm - kilohms (1000's ohms) kw - kilowatts LAN - local area network LR - lost record ly/min - langleys per minute mA - milliamps Mbps - megabits per second Mbyte - megabyte mph - miles per hour msl - mean sea level mV - millivolts N/A - Not applicable NIST - National Institute of Standards and Technology (formerly National Bureau of Standards, NBS)

NOAA - National Oceanic and Atmospheric Administration NRC - Nuclear Regulatory Commission NWS - National Weather Service PRT - platinum resistance thermometer RAC - Remote Access Computer REMIC - Radiological Environmental and Meteorological Instrumentation Committee RG - Regulatory Guide RSS - root sum of the squares, root sum squared RTD - resistance temperature detector SPP - Standard Programs and Processes TCP/IP - Transport Control Protocol/Internet Protocol TVA - Tennessee Valley Authority

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-a Rev. 0001 Manual METEOROLOGICAL MONITORING Page 30 of 30 7.0 ABBREVIATIONS AND DEFINITIONS (continued)

V, v - volts WAN - wide area network WD, wd - wind direction WS, ws - wind speed

EDS-CRN Clinch River Nuclear Plant Rev. 0001 Module II-b Page 1 of 65 METEOROLOGICAL MONITORING Quality Related ; Yes No Environmental Data Station Manual Effective Date Level of Use: Reference Use Prepared by: Kenneth G. Wastrack (EMA), Meteorologist Reviewed by: < see module II-a > n/a Date

< see module II-a > n/a Concurred by:

Date

< see module II-a > n/a Approved by:

Date

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 2 of 65 Table of Contents 1.0 SCOPE AND FORMAT OF MODULE II.................................................................................... 3 2.0 ACCURACY OF METEOROLOGICAL MEASUREMENTS ..................................................... 4 2.1 Overview and General ............................................................................................................... 4 2.2 WIND SPEED .......................................................................................................................... 10 2.3 WIND DIRECTION................................................................................................................... 19 2.4 AIR TEMPERATURE ............................................................................................................... 26 2.5 VERTICAL TEMPERATURE DIFFERENCE ........................................................................... 34 2.6 DEWPOINT TEMPERATURE ................................................................................................. 42 2.7 RAINFALL ................................................................................................................................ 49 2.8 SOLAR RADIATION ................................................................................................................ 55

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 3 of 65 1.0 SCOPE AND FORMAT OF MODULE II EDS Manual Module II (Meteorological Monitoring) contains an extensive amount of information that cannot be easily presented in a single document. Therefore, this module is divided into three parts:

A. Module II-a Introduction.

Station and Equipment Description.

Equipment Calibration and Maintenance.

Meteorological Data Processing, Validation, and Reporting.

References.

Abbreviations and Definitions.

B. Module II-b Accuracy of Meteorological Measurements.

C. Module II-c Site-specific Appendices.

All three parts of the Module are issued at the same time. Module II-a includes the Cover Page (with approval signatures) and the Revision Log for all three parts.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 4 of 65 2.0 ACCURACY OF METEOROLOGICAL MEASUREMENTS The FSAR states that the meteorological data collection system is designed to meet requirements given in NRC Regulatory Guide (RG) 1.23 (revision 1). Replacement components will be compatible with the total system and will be chosen so that the total system accuracy will meet or exceed RG-1.23 (revision 1) specifications.

While RG-1.23 identifies accuracy requirements, it does not provide guidance for determining accuracy of meteorological components. Therefore, the most up-to-date guidance available, ANSI/ANS-3.11-2005 (ANS-3.11), is used as the basis for estimating meteorological monitoring accuracy.

2.1 Overview and General Both sensor accuracy and system accuracy are calculated for each variable. The RG 1.23 specifications, and the ANS-3.11 specifications, the sensor accuracy, and the system accuracy, are listed for each variable.

Meteorological Data System -- Accuracy vs. Specification Comparison (Values are converted to the same units and rounded to the same precision.)

Specification Sensor System Accuracy Variable

• Units ANS-3.11 RG-1.23 r1 Accuracy Instantaneous Time-Averaged Wind Speed (WS) mph

• 8.9 mph +/-0.45 +/-0.45 +/-0.36 +/-0.36 +/-0.06

• 30.0 mph +/-1.50 +/-1.50 +/-0.37 +/-0.37 +/-0.06

• 100.0 mph +/-5.00 +/-5.00 +/-0.38 +/-0.39 +/-0.06 Wind Direction ° azimuth +/-5.0 +/-5.0 +/-3.0 +/-4.3 +/-2.1 Air Temperature °F

• [Day] High solar rad +/-0.900 +/-0.900 +/-0.078 +0.702 +0.657

• [Day] Low solar rad +/-0.900 +/-0.900 +/-0.078 -0.202 -0.157

• [Night] No solar rad +/-0.900 +/-0.900 +/-0.078 +/-0.202 +/-0.157 Vertical Temp. Diff. °F +/-0.180 +/-0.180 +/-0.105 +/-0.148 +/-0.046 Dewpoint °F +/-2.700 +/-2.700 +/-2.236 N/A +/-0.507 Rainfall inches

• 0.10 in.** +/-0.010 +/-0.010 +/-0.007 +/-0.009 N/A Solar Radiation (SR) ly/min not

• 0.28 ly/min +/-0.014 specified +/-0.006 N/A +/-0.021

• 0.45 ly/min *** +/-0.023 +/-0.015 N/A +/-0.022

• 1.50 ly/min +/-0.075 +/-0.027 N/A +/-0.026

• If a condition or value is listed, error values are specific for that condition/value. Otherwise, error values apply to the entire expected sampling range.

• • ANS-3.11-2005 and RG-1.23 (r1) specify that accuracy be estimated for a specific volume (2.54 mm, 0.10 inch).

• • • 0.45 ly/min is the lowest value at which the ANS-3.11-2005 specification is satisfied.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 5 of 65 2.1 Overview and General (continued)

ANS-3.11-2005 uses the root-sum-squared (RSS) method to determine system accuracy.

The individual random error components are combined and evaluated using the RSS approach. These RSS results are then adjusted by bias components to determine the final System Accuracy (SA). This approach is described below.

1. Identify the individual components that contribute to system accuracy.

2. Classify the error type for each component.

• Bias errors ( b1 , b 2 , L, b n ).

• Random errors ( r1 , r2 , L, rn ).

3. Estimate the values of the component errors based on engineering analysis, vendor specifications, accuracy tests, or operational experience.

4. Perform time-average adjustments for each random error component.

a=r n Where: r is the unadjusted random error component.

n is the number of samples.

a is the adjusted random error component.

Note: For instantaneous values (where n = 1), a = r.

5. Calculate "root sum of the squares" (RSS) for the adjusted random error components.

RSS = (a 1 )2 + (a 2 )2 + L + (a x )2 Where: a 1 , a 2 ,L, a x are adjusted random error components.

x represents the number of random error components.

6. Add bias errors to obtain system accuracy (SA).

SA = RSS + b1 + b 2 + L + b y Where: b1 , b 2 ,L, b y are bias error components.

y represents the number of bias error components.

Note: Repeat as necessary with different bias values to determine extreme values.

7. Compare the extreme SA values with applicable requirements to evaluate system performance.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 6 of 65 2.1 Overview and General (continued)

ANS-3.11-2005 requires that accuracy be examined for both sensor accuracy and system accuracy values.

• When the vendor provides sensor accuracy, that value is compared with accuracy requirements and used as an error component in the system accuracy calculation.

• When the sensor is calibrated by TVA, the ANS-3.11 method is used to determine the sensor accuracy that is compared with accuracy requirements and used as an error component in the system accuracy calculation.

• The system accuracy is calculated using the ANS-3.11 method and compared with accuracy requirements.

Meteorological Measurement Error Sources--Identifiable error sources have been divided into three major categories (Figure II-3). Within these categories, the individual sources of error are evaluated for each type of meteorological measurement.

Note about Time Intervals For the purposes of error analyses; semi-annual, 6 months, & 184 days are the same time interval.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 7 of 65 2.1 Overview and General (continued)

Figure II-3 METEOROLOGICAL MEASUREMENT ERROR SOURCES Test Standard SENSOR Position Input Sensor Calibration Output Measurement Tolerance Readout Device Sensor Drift Solar Heating SAMPLING of Air Temperature/

Aspirators Vertical Temperature Difference Sensor Misreporting Placement or of Data Orientation Times Wind Direction/Wind Speed Precipitation Cosine Temperature Response Sensitivity Solar Radiation Test Meter/ Channel Test Input Signal Calibration SIGNAL Transfer Position Tolerance Standard CONDITIONING Input Output Output Tolerance Final Processing Rounding DASU Hardware Software Drift Fig. CR_II-3

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 8 of 65 2.1.1 SENSOR ACCURACY Sensor accuracy is associated with calibration of the sensor and the drift between calibrations. A single sensor error value is calculated, compared with the sensor requirements, and used in the system accuracy calculation.

A. Sensor Calibration -- Errors associated with comparison to a standard of higher accuracy.

1. Input

a. Standard -- Accuracy of the standard that is certified using a national standard (NIST or equivalent).

b. Test position -- Accuracy associated with sensor orientation or location in the test apparatus.

2. Output

a. Measurement/Readout device -- Accuracy of test meter or display.

b. Tolerance -- Allowable accuracy of test results.

B. Sensor Drift -- Errors associated with loss of accuracy between calibrations.

2.1.2 SYSTEM ACCURACY The system accuracy is based on the sensor error, sampling errors, and signal conditioning errors are used for calculating the system error. The system accuracy is compared with the system requirements. Based on the specific variable, one or two system accuracy values are calculated--one assuming instantaneous data (primarily for in-plant displays) and/or one using time-averaging assumptions (primarily for archival data).

A. Sensor Error The sensor error values used in the system error are based on the calculated sensor errors and adjusted for the number of readings used to determine the final reported value.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 9 of 65 2.1.2 SYSTEM ACCURACY (continued)

B. Sampling Errors Sampling errors are those errors due to interference in the sensing of the exact physical quantity being measured. Since the nature of the sampling errors is different for each type of sensor, these errors are described separately for each measurement, as appropriate.

• Air Temperature/Vertical Temp. Difference - Solar Heating of Aspirators

• Wind Direction/Wind Speed - Sensor Orientation or Placement

• Precipitation - Misreporting of Data Times

• Solar Radiation - Cosine Response

- Temperature Sensitivity C. Signal Conditioning Errors Signal conditioning errors are those errors associated with calibration of the data channel, the drift of hardware components, and software rounding errors between calibrations.

1. Channel Calibration -- Errors associated with comparison to a standard of higher accuracy.

a. Input (1) Input signal tolerance -- Accuracy of the test signal.

(2) Test meter or transfer standard -- Accuracy of the standard that is used for the actual calibration.

(3) Test position -- Accuracy associated with sensor orientation or location in the test apparatus.

b. Output tolerance -- Allowable accuracy of test results.

2. Processing Hardware Drift -- Errors associated with hardware components used for signal processing.

a. Data Acquisition Switch Unit -- Accuracy associated with selecting the correct input signal and converting the electrical signal to input for the data logger computer.

3. Software -- Errors associated with software computations.

a. Final rounding of hourly average value -- Accuracy of data values as output.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 10 of 65 2.2 WIND SPEED VARIABLE: Wind Speed (Vaisala Model 425 ultrasonic wind sensor)

MEASUREMENT METHOD: Ultrasonic wind sensor, direct output of 1-second average wind speed samples VALID DATA RANGE: 0.0 - 99.9 mph CALIBRATED RANGE: 1.0 to 30.0 mph NUMBER OF SAMPLES ASSUMED: 180 samples in 15 minutes REQUIREMENTS SPECIFICATIONS ANSI/ANS-3.11-2005 * +/-0.2 m/s [0.45 mph] for WS < 8.9 mph

• +/-5% of observed for WS 8.9 mph RG-1.23 (Revision 1) * +/-0.2 m/s (0.45 mph) for WS < 8.9 mph

• +/-5% of observed for WS 8.9 mph SOURCES OF ERROR - SENSOR POTENTIAL ERROR (mph)

1. 8.9 30.0 100.0 SENSOR ACCURACY Samples mph mph mph A. Sensor Calibration

1. Input

a. Standard 1 +/-0.20 +/-0.20 +/-0.20

b. Test position [bias] --- +/-0.00 +/-0.01 +/-0.02

2. Output

a. Measurement/Readout device --- --- --- ---

b. Tolerance 1 +/-0.30 +/-0.30 +/-0.30 B. Sensor Drift --- --- --- ---

ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.36 +/-0.37 +/-0.38 Specification (mph) +/-0.45 +/-1.50 +/-5.00 Meets Specifications? Yes Yes Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 11 of 65 2.2 WIND SPEED (continued)

SOURCES OF ERROR - INSTANTANEOUS CHANNEL POTENTIAL ERROR (mph)

1. 8.9 30.0 100.0 SYSTEM ACCURACY Samples mph mph mph A. SENSOR ERROR (from above)

+/-0.36, +/-0.37, or +/-0.38 1 +/-0.36 +/-0.37 +/-0.38 B. SAMPLING ERRORS

• Sensor Placement 1 +/-0.00 +/-0.02 +/-0.04 C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- --- --- ---

(2) Test meter/ transfer standard --- --- --- ---

(3) Test position --- --- --- ---

b. Output tolerance --- --- --- ---

2. Processing Hardware Drift

a. Data Acquisition Switch Unit --- --- --- ---

3. Software

a. Rounding of final average value 1 +/-0.05 +/-0.05 +/-0.05 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.36 +/-0.37 +/-0.39 Specification (mph) +/-0.45 +/-1.50 +/-5.00 Meets Specifications? Yes Yes Yes SOURCES OF ERROR - TIME-AVERAGED CHANNEL POTENTIAL ERROR (mph)

1. 8.9 30.0 100.0 SYSTEM ACCURACY Samples mph mph mph A. SENSOR ERROR (from above)

+/-0.36, +/-0.37, or +/-0.38 180 +/-0.03 +/-0.03 +/-0.03 B. SAMPLING ERRORS

• Sensor Placement 180 +/-0.00 +/-0.00 +/-0.00 C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- --- --- ---

(2) Test meter/ transfer standard --- --- --- ---

(3) Test position --- --- --- ---

b. Output tolerance --- --- --- ---

2. Processing Hardware Drift

a. Data Acquisition Switch Unit --- --- --- ---

3. Software

a. Rounding of final average value 1 +/-0.05 +/-0.05 +/-0.05 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.06 +/-0.06 +/-0.06 Specification (mph) +/-0.45 +/-1.50 +/-5.00 Meets Specifications? Yes Yes Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 12 of 65 2.2 WIND SPEED (continued)

WIND SPEED, ERROR SOURCE/VALUE EXPLANATION Both ANSI/ANS-3.11-2005 and RG-1.23 (Revision 1) use a two-part specification for wind speed accuracya constant value of +/-.2 m/s (+/-0.45 mph) for all wind speeds 4 m/s (8.9 mph) and below, and a +/-5% of observed value for all wind speeds above 4 m/s (8.9 mph).

To encompass the full range of expected conditions, accuracy is calculated for 3 speeds:

• 8.9 mph -- This is the breakpoint between the constant value used for low-speed ranges and the 5% value used for higher ranges.

• 30.0 mph -- This is the upper limit of the calibrated range, because the calibration equipment allows calibration only over the range 1.0-30.0 mph

• 100.0 mph -- This is just above the maximum value (99.9 mph) that the TVA measurement system can report, and is the upper limit for the range over which the 5%

error requirement applies.

Since the error relationship is linear over the range from 8.9 mph to 100.0 mph, all requirements within the range will be satisfied if requirements are satisfied at the upper and lower limits of the range.

2.2.1 WIND SPEED SENSOR ACCURACY A. Sensor Calibration The sensor under test is compared with an NIST-certified Climet Cup Anemometer using an open wind tunnel. The wind tunnel consists of a nozzle (with known flow characteristics) attached to a blower. The flow field downstream of the nozzle is in the open but is certified as laminar in engineering specifications. Sensors being tested in the flow field can be replaced while the wind tunnel is operating.

1. Input Each sensor is calibrated at threshold and six test points (1, 2, 5, 10, 20, and 30 mph).

NOTE Based on linearity tests conducted using the NOAA Oak Ridge wind tunnel, sensor calibration results are applicable to wind speeds up to 70 mph. Since the sensor has no moving parts to sense wind speed, and since the measurements are linear from 0 to 70 mph, it is assumed that the same linearity is valid up to 100.0 mph.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 13 of 65 2.2.1 WIND SPEED SENSOR ACCURACY (continued)

Wind Speed Calibration Methodology Threshold

• The wind tunnel is turned off at the start of the test.

• The test sensor is placed on the mounting.

• The wind tunnel speed is slowly increased until the test sensor records a speed above 0.0 mph.

• This speed is reported as the threshold speed.

Test points

• For each speed test point above the threshold, the standard sensor is placed in the flow field and the blower is adjusted until the sensor reports the desired wind speed.

For the remaining steps, the blower speed is not changed and the sensors are swapped while the wind tunnel continues to operate.

• The standard sensor is removed from the flow field.

• Each test sensor (in turn) is placed on the mounting, so that the sensing portions are in the flow field.

• The speed is checked against the desired speed.

After the last test sensor has been checked, the standard is replaced into the flow field to verify that the desired speed has been maintained.

a. Standard = +/-0.20 mph.

This is a random error since the value reported may be either above or below the actual wind speed. The number of readings is assumed to be 1 because calibrations are performed at a single wind speed during a specific round of tests (and is treated as an instantaneous observation).

The standard, a Climet Cup Anemometer, is recertified by NIST with an uncertainty of +/-0.15 mph (based on NIST certification documentation). The Climet cups control the instrument response, provided the cups and bearings are in good condition. Cup geometry is periodically checked and bearings are replaced when starting threshold test values are above normal. A conservative allowance of +/-0.05 mph is added to account for slight cup abnormality and bearing wear.

+/-0.15 mph + +/-0.05 mph = +/-0.20 mph.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 14 of 65 2.2.1 WIND SPEED SENSOR ACCURACY (continued)

b. Test position

[8.9 mph] = +/-0.00 mph.

[30.0 mph] = +/-0.01 mph.

[100.0 mph] = +/-0.02 mph.

Test position concerns the sensor placement in the wind tunnel, because the wind sensor is responsive to wind components not directly perpendicular to its shaft. The laboratory calibration procedure requires the sensors to be plumb within +/-1° during calibration.

This is a bias error since the sensor mounting will allow the sensor to be placed in only one position relative to wind flow for all tests--the maximum error is assumed.

8.9 mph: Non-vertical placement [(1-cos 1°)x8.9 mph]: +/-0.001 mph Conservative Approximation: +/-0.001 mph Final Estimated Error: +/-0.00 mph 30 mph: Non-vertical placement [(1-cos 1°)x30.0 mph]: +/-0.005 mph Conservative Approximation: +/-0.001 mph Final Estimated Error: +/-0.01 mph 100 mph: Non-vertical placement [(1-cos 1°)x100.0 mph]: +/-0.015 mph Conservative Approximation: +/-0.005 mph Final Estimated Error: +/-0.02 mph

2. Output

a. Measurement/Readout device = Not Applicable (N/A).

The sensor is directly connected to the data logger and no interface equipment is used.

b. Tolerance = +/-0.30 mph.

This is a random error since the value reported may be either above or below the actual wind speed. The number of readings is assumed to be 1 because calibrations are performed at a single wind speed during a specific round of tests (and is treated as an instantaneous observation).

The tolerance of sensor output is +/-0.30 mph based on the allowable error in CLS Calibration Instruction 450.01-019.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 15 of 65 2.2.1 WIND SPEED SENSOR ACCURACY (continued)

B. Sensor Drift = N/A.

The sensor is fully digital with no components that are subject to drift.

Sensor Accuracy Calculations (0.20 )2 + (0.30 )2 +/- 0.00 = +/-0.36 mph 8.9 mph:

(0.20 )2 + (0.30 )2 +/- 0.01 = +/-0.37 mph 30.0 mph:

(0.20 )2 + (0.30 )2 +/- 0.02 = +/-0.38 mph 100.0 mph:

Sensor errors satisfy RG-1.23 and ANS-3.11 specifications for all wind speeds.

2.2.2 WIND SPEED SYSTEM ACCURACY A. SENSOR ERROR Instantaneous Data Channel [8.9 mph] = +/-0.36 mph.

[30.0 mph] = +/-0.37 mph.

[100.0 mph] = +/-0.39 mph.

Time-Averaged Data Channel [8.9 mph] = +/-0.03 mph.

[30.0 mph] = +/-0.03 mph.

[100.0 mph] = +/-0.03 mph.

The sensor error values used in the system error are based on the calculated sensor errors and adjusted for the number of readings used to determine the final reported value.

This is a random error since the value reported may be either above or below the actual wind speed. The number of readings is assumed to be 180 because that is the number of samples used for a 15-minute data value.

Wind Speed Random Error Time-adjusted Error 8.9 mph +/-0.36 mph +/- 0.36 180 = +/-0.03 mph 30.0 mph +/-0.37 mph +/- 0.37 180 = +/-0.03 mph 100.0 mph +/-0.38 mph +/- 0.38 180 = +/-0.03 mph

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 16 of 65 2.2.2 WIND SPEED SYSTEM ACCURACY (continued)

B. SAMPLING ERRORS Sensor placement

1. Instantaneous Data Channel

[8.9 mph] = +/-0.00 mph.

[30.0 mph] = +/-0.02 mph.

[100.0 mph] = +/-0.04 mph.

2. Time-Averaged Data Channel

[8.9 mph] = +/-0.00 mph.

[30.0 mph] = +/-0.00 mph.

[100.0 mph] = +/-0.00 mph.

Errors from sensor non-vertical placement on the meteorological tower are the same as explained in "Test Position" above, but are doubled to reflect problems with placement in the field.

This is a random error since the wind flow can be from any direction, so the sensor can appear to be mounted in any position relative to wind flow--the maximum error is assumed. The number of readings is assumed to be 180 because that is the number of samples used for a 15-minute data value.

Wind Speed Random Error Time-adjusted Error 8.9 mph +/-0.00 mph +/- 0.00 180 = +/-0.00 mph 30.0 mph +/-0.02 mph +/- 0.02 180 = +/-0.00 mph 100.0 mph +/-0.04 mph +/- 0.04 180 = +/-0.00 mph

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 17 of 65 2.2.2 WIND SPEED SYSTEM ACCURACY (continued)

C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration The sensor is directly connected to the data logger and no interface equipment is used.

a. Input (1) Input signal tolerance = N/A.

(2) Test meter or transfer standard = N/A.

(3) Test position = N/A.

b. Output tolerance = N/A.

2. Processing Hardware Drift Drift errors do not apply since the sensors are connected directly to the data logger computerNo interface equipment is used.

a. Data Acquisition Switch Unit (DASU) = N/A.

3. Software The sensor reports the wind speed value directly. No conversion is necessary.

a. Final rounding of hourly average values= +/-0.05 mph.

This value applies to both the instantaneous and time-averaged data channels.

This is a random error since the value reported may be on either side of the actual wind speed. The number of readings is assumed to be 1 because the calculation is performed on the single final value before it is reported.

The software reports the wind speed to the nearest 0.1 mph. Therefore, the maximum rounding error is +/-0.05 mph.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 18 of 65 2.2.2 WIND SPEED SYSTEM ACCURACY (continued)

System Accuracy Calculations (Instantaneous Data Channel) 5.0 mph: (0.36 )2 + (0.00)2 + (0.05)2 +/- 0.00 = +/-0.36 mph 30.0 mph: (0.37 )2 + (0.02)2 + (0.05)2 +/- 0.00 = +/-0.37 mph 100.0 mph: (0.38)2 + (0.04)2 + (0.05)2 +/- 0.00 = +/-0.39 mph System errors satisfy RG-1.23 and ANS-3.11 specifications for all wind speeds.

System Accuracy Calculations (Time-Averaged Data Channel) 5.0 mph: (0.03)2 + (0.00)2 + (0.05)2 +/- 0.00 = +/-0.06 mph 30.0 mph: (0.03)2 + (0.00)2 + (0.05)2 +/- 0.00 = +/-0.06 mph 100.0 mph: (0.03)2 + (0.00)2 + (0.05)2 +/- 0.00 = +/-0.06 mph System errors satisfy RG-1.23 and ANS-3.11 specifications for all wind speeds.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 19 of 65 2.3 WIND DIRECTION VARIABLE: Wind Direction (Vaisala Model 425 ultrasonic wind sensor)

MEASUREMENT METHOD: Ultrasonic wind sensor, direct output of 1 second average wind direction samples VALID DATA RANGE: 0 - 359° azimuth CALIBRATED RANGE: 0 - 360° azimuth NUMBER OF SAMPLES ASSUMED: 180 samples in 15 minutes REQUIREMENTS SPECIFICATIONS ANSI/ANS-3.11-2005 * +/-5° for all wind directions RG-1.23 (Revision 1) * +/-5° for all wind directions POTENTIAL SOURCES OF ERROR - SENSOR ERROR (°)

1. All SENSOR ACCURACY Samples WD A. Sensor Calibration

1. Input

a. Standard 1 +/-0.3

b. Test position [bias] --- +/-0.0

2. Output

a. Measurement/Readout device --- ---

b. Tolerance 1 +/-3.0 B. Sensor Drift --- ---

ROOT-SUM-SQUARE ERROR (with bias adjustments) +/- 3.0 Specification (°) +/- 5.0 Meets Specifications? Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 20 of 65 2.3 WIND DIRECTION (continued)

POTENTIAL SOURCES OF ERROR - INSTANTANEOUS CHANNEL ERROR (°)

1. All SYSTEM ACCURACY Samples WD A. SENSOR ERROR (+/- 3.0° from above) 1 +/-3.0 B. SAMPLING ERRORS

• [BIAS] Sensor orientation and alignment = +/-1.2 --- ---

C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- ---

(2) Test meter/ transfer standard 1 +/-0.5 (3) Test position --- ---

b. Output tolerance 1 +/-0.5

2. Processing Hardware Drift

a. Data Acquisition Switch Unit --- ---

3. Software

a. Rounding of final average value 1 +/-0.5 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-4.3 Specification (°) +/-5.0 Meets Specifications? Yes POTENTIAL SOURCES OF ERROR - TIME-AVERAGED CHANNEL ERROR (°)

1. All SYSTEM ACCURACY Samples WD A. SENSOR ERROR (+/- 3.0° from above) 180 +/-0.2 B. SAMPLING ERRORS

• [BIAS] Sensor orientation and alignment = +/-1.2 --- ---

C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- ---

(2) Test meter/ transfer standard 1 +/-0.5 (3) Test position --- ---

b. Output tolerance 1 +/-0.5

3. Processing Hardware Drift

a. Data Acquisition Switch Unit --- ---

2. Software

a. Rounding of final average value 1 +/-0.5 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-2.1 Specification (°) +/-5.0 Meets Specifications? Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 21 of 65 2.3 WIND DIRECTION (continued)

WIND DIRECTION, ERROR SOURCE/VALUE EXPLANATION Both ANSI/ANS-3.11-2005 and RG-1.23 (Revision 1) use a specification of +/-5.0° for all wind directions.

2.3.1 WIND DIRECTION SENSOR ACCURACY A. Sensor Calibration The sensor under test is subjected to laminar flow at a near constant speed in a wind tunnel. Different wind directions are tested by rotating the sensor.

1. Input Each sensor is calibrated at five points (0°, 30°, 45°, 150°, and 270° azimuth).

One point (0° azimuth) verifies field orientation direction. Three directions (30°,

150°, and 270° azimuth) verify proper operation when wind speed along one axis is near 0 mph. One point (45° azimuth) verifies correct operation when no axis is near perpendicular or near parallel to wind flow.

Wind Direction Calibration Methodology

• The wind tunnel speed is set to a speed that ensures laminar flow (~10 mph).

• The standard sensor is placed in the mounting and the wind direction is obtained.

• The standard sensor is then rotated to the next position and the next wind direction is obtained. This is repeated for all five wind directions before the standard sensor is removed.

• Without changing the blower speed, each test sensor is placed on the mounting.

• Each wind direction is checked by rotating the sensor to each of the five test positions.

• After all directions have been checked, the test sensor is removed and the next test sensor is placed in the mounting.

• When the last test sensor has been checked, the standard is replaced in the mounting and the wind directions are verified for each position.

a. Standard = +/-0.3°.

The standard, a rotary index for Vaisala wind sensor, is certified to an accuracy of +/-0.210°, rounded up to +/-0.3°.

This is a random error since the value reported may be on either side of the actual wind direction. The number of readings is assumed to be 1 because calibrations are performed at a single wind direction during a specific round of tests (and is treated as an instantaneous observation).

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 22 of 65 2.3.1 WIND DIRECTION SENSOR ACCURACY (continued)

b. Test position = +/-0.0°.

Laser alignment of to the standard rotary index for Vaisala wind sensor is performed according to CLS Instruction 450.01-026, so test position errors are negligible.

This is a random error since the value reported may be on either side of the actual wind direction. The number of readings is assumed to be 1 because calibrations are performed at a single wind direction during a specific round of tests (and is treated as an instantaneous observation).

2. Output The sensor is directly connected to the data logger and no interface equipment is used.

a. Measurement/Readout device = Not Applicable (N/A).

b. Tolerance = +/-3.0°.

The tolerance of sensor output is +/-3.0° based on the allowable error in CLS Calibration Instruction 450.01-019.

This is a random error since the value reported may be on either side of the actual wind direction. The number of readings is assumed to be 1 because calibrations are performed at a single wind direction during a specific round of tests (and is treated as an instantaneous observation).

B. Sensor Drift = N/A.

The sensor is fully digital with no components that are subject to drift.

Sensor Accuracy Calculations All WD: (0.3)2 + (0.0 )2 + (3.0 )2 +/- 0.0 = 3.0 o Sensor error satisfies RG-1.23 and ANS-3.11 specifications for all wind directions.

2.3.2 WIND DIRECTION SYSTEM ACCURACY A. SENSOR ERROR

1. Instantaneous Data Channel [All WD] = +/-3.3°.

2. Time-Averaged Data Channel [All WD] = +/-1.1°.

The sensor error values used in the system error are based on the calculated sensor errors and adjusted for the number of readings used to determine the final reported value.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 23 of 65 2.3.2 WIND DIRECTION SYSTEM ACCURACY (continued)

This is a random error since the value reported may be either above or below the actual wind speed. The number of readings is assumed to be 180 because that is the number of samples used for a 15-minute data value.

Wind Direction Random Error Time-adjusted Error All WD +/-3.0° +/- 3 .0 180 = +/-0.2 o B. SAMPLING ERRORS Sensor orientation

1. Instantaneous Data Channel [All WD] = +/-1.2°.

2. Time-Averaged Data Channel [All WD] = +/-1.2°.

The sensor mountings on the tower and the orientation reference markers are permanently fixed in place.

a. Surveyor checks have determined that sensor mounting placement error is less than 1° of azimuth (1.0°).

b. The transponder prongs used for sensor orientation are about 2.5 inches off-center, so the center of the sensor measurement element can be slightly mis-aligned. Assuming the orientation reference mark is at least 100 feet away, this can result in the centerline of the sensor being mis-aligned up to 0.15°.

c. The combined effect of these two errors is 1.00° + 0.15° = 1.15°. This is rounded up to 1.2°.

This is a BIAS error since the sensor orientation will remain fixed for all observations.

C. SIGNAL CONDITIONING AND DATA LOGGER ERRORS Sensor alignment on the tower is performed according to QA Procedure EPFS-4 when the sensor is exchanged.

1. Channel Calibration Sensor alignment consists of physical orientation with an established reference point. A transit at the reference point is used to sight along the North-South axis of the sensor to verify the orientation.

a. Input (1) Input signal tolerance = N/A.

No test signal is used to orient sensor.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 24 of 65 2.3.2 WIND DIRECTION SYSTEM ACCURACY (continued)

(2) Test meter or transfer standard = +/- 0.5°.

This value applies to both the instantaneous and time-averaged data channels.

The transfer standards are permanently positioned and marked alignment control points. One point is located directly under the sonic wind sensor with the extension arm in the normal operating position.

The other control point is located to the north (adjacent to the fence).

These transit sighting points, established by surveying methods, are accurate to less than 0.5°.

This is a random error since the value reported may be on either side of the actual wind direction. The number of readings is assumed to be 1 because the installation takes place at a specific time (and is treated as an instantaneous observation).

Estimated maximum error is +/-0.5°.

(3) Test position = N/A.

The sensor mountings on the tower are permanently fixed in place, so no tests are performed on the sensor after installation on the tower.

b. Output tolerance = +/- 0.5°.

This value applies to both the instantaneous and time-averaged data channels.

During alignment of the sensor on the tower, a person on the ground verifies the sensor alignment through a transit placed at the north alignment control point. The maximum allowable sensor alignment error is +/-0.5° (QA procedure EPFS-4).

This is a random error since the value reported may be on either side of the actual wind direction. The number of readings is assumed to be 1 because the installation takes place at a specific time (and is treated as an instantaneous observation).

2. Processing Hardware Drift Drift errors do not apply since the sensors are connected directly to the data logger computerNo interface equipment is used.

a. Data Acquisition Switch Unit (DASU) = N/A.

3. Software The sensor reports the wind speed value directly. No conversion is necessary.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 25 of 65 2.3.2 WIND DIRECTION SYSTEM ACCURACY (continued)

a. Final rounding of hourly average values= +/-0.5°.

This value applies to both the instantaneous and time-averaged data channels.

This is a random error since the value reported may be on either side of the actual wind direction. The number of readings is assumed to be 1 because the calculation is performed on the single final value before it is reported.

The software reports the wind direction to the nearest 1°. This gives a maximum rounding error of +/-0.5°.

System Accuracy Calculations (Instantaneous Data Channel)

All WD: (3.0 )2 + (0.5)2 + (0.5)2 + (0.5)2 +/- 1.2 = +/-4.3o System error satisfies RG-1.23 and ANS-3.11 specifications for all wind directions.

System Accuracy Calculations (Time-Averaged Data Channel)

All WD: (0.2)2 + (0.5)2 + (0.5)2 + (0.5)2 +/- 1.2 = +/-2.1o System error satisfies RG-1.23 and ANS-3.11 specifications for all wind directions.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 26 of 65 2.4 AIR TEMPERATURE VARIABLE: Air Temperature (Weed Instrument Company, Model 101, R0 = 100 RTD)

MEASUREMENT METHOD: 100-ohm Platinum RTD, 4-wire ohms measurement, instantaneous sampling of ohms VALID DATA RANGE: -30.00°F to +120.00°F CALIBRATED RANGE: -10.00°F to +110.00°F NUMBER OF SAMPLES ASSUMED: 180 samples in 15 minutes REQUIREMENTS SPECIFICATIONS ANSI/ANS-3.11-2005 * +/-0.900°F for all temperatures RG-1.23 (Revision 1) * +/-0.900°F for all temperatures Day (High) assumes maximum daytime solar. Day (Low) assumes minimum daytime solar.

Night assumes no solar.

SOURCES OF ERROR - SENSOR POTENTIAL ERROR (°F)

1. Day Day SENSOR ACCURACY Samples (High) (Low) Night A. Sensor Calibration

1. Input

a. Standard 1 +/-0.036 +/-0.036 +/-0.036

b. Test position 1 +/-0.000 +/-0.000 +/-0.000

2. Output

a. Measurement/Readout device 1 +/-0.018 +/-0.018 +/-0.018

b. Tolerance 1 +/-0.050 +/-0.050 +/-0.050 B. Sensor Drift 1 +/-0.045 +/-0.045 +/-0.045 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.078 +/-0.078 +/-0.078 Specifications (°F) +/-0.900 +/-0.900 +/-0.900 Meets Specifications? Yes Yes Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 27 of 65 2.4 AIR TEMPERATURE (continued)

SOURCES OF ERROR - INSTANTANEOUS POTENTIAL ERROR (°F)

1. Day Day SYSTEM ACCURACY Samples (High) (Low) Night A. SENSOR ERROR (+/-0.078°F from above) 1 +/-0.078 +/-0.078 +/-0.078 B. SAMPLING ERRORS

• a. Solar Heating [bias] --- +0.500 -0.000 +/-0.000 C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- --- --- ---

(2) Test meter/ transfer standard 1 +/-0.045 +/-0.045 +/-0.045 (3) Test position --- --- --- ---

b. Output tolerance 1 +/-0.150 +/-0.150 +/-0.150 2 Processing Hardware Drift

a. Data Acquisition Switch Unit 1 +/-0.100 +/-0.100 +/-0.100

3. Software

a. Rounding of final average value 1 +/-0.005 +/-0.005 +/-0.005 ROOT-SUM-SQUARE ERROR (with bias adjustments) +0.702 -0.202 +/-0.202 Specifications (°F) +/-0.900 +/-0.900 +/-0.900 Meets Specifications? Yes Yes Yes SOURCES OF ERROR - TIME-AVERAGED POTENTIAL ERROR (°F)

1. Day Day SYSTEM ACCURACY Samples (High) (Low) Night A. SENSOR ERROR (+/-0.078°F from above) 180 +/-0.006 +/-0.006 +/-0.006 B. SAMPLING ERRORS

• a. Solar Heating [bias] --- +0.500 -0.000 +/-0.000 C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- --- --- ---

(2) Test meter/ transfer standard 1 +/-0.045 +/-0.045 +/-0.045 (3) Test position --- --- --- ---

b. Output tolerance 1 +/-0.150 +/-0.150 +/-0.150

2. Processing Hardware Drift

a. Data Acquisition Switch Unit 180 +/-0.007 +/-0.007 +/-0.007

3. Software

a. Rounding of final average value 1 +/-0.005 +/-0.005 +/-0.005 ROOT-SUM-SQUARE ERROR (with bias adjustments) +0.657 -0.157 +/-0.157 Specifications (°F) +/-0.900 +/-0.900 +/-0.900 Meets Specifications? Yes Yes Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 28 of 65 2.4 AIR TEMPERATURE (continued)

AIR TEMPERATURE, ERROR SOURCE/VALUE EXPLANATION Both ANSI/ANS-3.11-2005 and RG-1.23 (Revision 1) use a specification of +/-0.900°F for all temperatures.

All Temperature system error components are identical, except for the component due to solar heating of the aspirator shield ("SAMPLING ERRORS").

2.4.1 AIR TEMPERATURE SENSOR ACCURACY A. Sensor Calibration RTDs are calibrated in sets of three in the laboratory. Each set of RTDs is immersed in a well-mixed constant temperature bath and compared with a standard platinum resistance thermometer.

1. Input Calibrated at 0°C, 40°C, and 100°C (32°F, 104°F, and 212°F).

a. Standard = +/-0.036°F.

The standard platinum resistance thermometer (PRT) has an uncertainty of

+/-0.02°C (+/-0.036°F) based on Central Laboratories Services Standards Specifications Manual.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

b. Test position = +/-0.000°F.

There is virtually no temperature gradient in the constant temperature bath since the bath is well-mixed and data are stabilized before measurements.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 29 of 65 2.4.1 AIR TEMPERATURE SENSOR ACCURACY (continued)

2. Output

a. Measurement/Readout device = +/-0.018°F.

The Azonix A1011 resistance temperature detector (RTD) thermometer used to measure sensor RTD temperatures has an accuracy of 0.01°C (0.018°F) based on manufacturer literature.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

b. Tolerance = +/-0.050°F.

The outputs of this calibration are calibration equations for the three sensor RTDs and several test temperatures computed with the equations. The computed temperatures are compared with true temperatures to check the performance of the equations. The maximum allowable error is +/-0.05°F (CLS Calibration Instruction 450.01-005).

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

B. Sensor Drift = +/-0.045°F.

Sensor RTD drift between calibrations is limited to +/-0.01 ohm (+/-0.045°F) at the ice point (CLS Calibration Instruction 450.01-005).

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

Sensor Accuracy Calculations All Temperatures:

(0.036 )2 + (0.000)2 + (0.018)2 + (0.050)2 + (0.045)2 +/- 0.000 = +/-0.078 o F Sensor error satisfies RG-1.23 and ANS-3.11 specifications for all temperatures.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 30 of 65 2.4.2 AIR TEMPERATURE SYSTEM ACCURACY A. SENSOR ERROR

1. Instantaneous Data Channel [All Temperatures] = +/- 0.078°F.

2. Time-Averaged Data Channel [All Temperatures] = +/- 0.006°F.

The sensor error values used in the system error are based on the calculated sensor errors and adjusted for the number of readings used to determine the final reported value.

This is a random error since the value reported may be either above or below the actual wind speed. The number of readings is assumed to be 180 because that is the number of samples used for a 15-minute data value.

Temperature Random Error Time-adjusted Error All Temperatures +/-0.078°F +/- 0.078 180 = +/-0.006 o F B. SAMPLING ERRORS Solar heating of aspirator

1. High solar [All Temperatures] = +0.500°F.

2. Low solar [All Temperatures] = -0.000°F.

3. No solar [All Temperatures] = +/-0.000°F.

This value applies to both the instantaneous and time-averaged data channels.

The radiation shields housing sensor RTDs on the tower depend on multiple layers of reflective white surfaces and constant airflow through the shields to minimize the heating of RTDs above ambient air temperature by solar radiation. The manufacturer specifies the maximum temperature rise inside the shield to be +0.4°F. This assumes a clean, properly aspirated shield. Even though TVA's shields are well maintained and have fan monitors to assure proper aspiration, an additional allowance of +0.1°F accounts for some darkening of reflective surfaces due to aging and dirt.

This is a BIAS error since the effect of solar heating will only increase the temperature during the daytime. The maximum error is assumed for positive day-time conditions.

For all other conditions, a 0.000 bias is assumed.

High solar: +0.4°F plus +0.1°F = +0.500°F.

Low solar/No solar: +0.0°F plus +0.0°F = +0.000°F.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 31 of 65 2.4.2 AIR TEMPERATURE SYSTEM ACCURACY (continued)

C. SIGNAL CONDITIONING AND DATA LOGGER ERRORS Sensor installation on the tower is performed according to QA Procedure EPFS-4 when the sensor is exchanged.

1. Channel Calibration This calibration which includes DASU and computer is performed every 184 days.

a. Input Calibrated at 94, 104, 114 ohms (1) Input signal tolerance = Not Applicable (N/A).

Fixed resistors are used in the temperature channel calibrator and require no setting by the operator.

(2) Test meter or transfer standard = +/- 0.045°F.

This value applies to both the instantaneous and time-averaged data channels.

The maximum allowable error in re-certification of Temperature Channel Calibrators is +/-0.01 ohm based on CLS Calibration Instruction 450.01-011.

0.01 ohm @ 4.5°F/ohm = +/-0.045°F.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibration is performed at a single temperature (and is treated as an instantaneous observation).

(3) Test position = N/A.

The temperature channel calibrator is not position sensitive.

b. Output tolerance = +/- 0.150°F.

This value applies to both the instantaneous and time-averaged data channels.

The maximum allowable error is +/-0.15°F (EPFS-6).

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibration is performed at a single temperature (and is treated as an instantaneous observation).

2. Processing Hardware Drift

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 32 of 65 2.4.2 AIR TEMPERATURE SYSTEM ACCURACY (continued)

Drift error is for at least 184 days and +/-5°C because the air temperature measurement system is re-calibrated each 184 days and the building temperature is controlled within +/-5°C.

a. Data Acquisition Switch Unit (DASU)

(1) Instantaneous Data Channel [All Temperatures] = +/-0.100°F.

(2) Time-Averaged Data Channel [All Temperatures] = +/-0.007°F.

This is a random error since the value reported may be on either side of the actual temperature. The number of readings is assumed to be 180 because that is the number of samples used for a 15-minute data value.

For the DASU, the 1-year drift on the 1000 ohm (1.0 k) range has a specification of 0.010 percent of reading plus 0.001 percent of the range.

With a maximum reading of 120 ohms (122°F), this yields:

(120 ohm X 0.010%) + (1000 ohm X 0.001%)

= 0.012 ohm + 0.010 ohm

= 0.022 ohm.

Converting from ohms to degrees (using a typical scale factor):

0.022 ohm X 4.5°F/ohm

= 0.099°F -- rounded up to 0.100°F.

Temperature Random Error Time-adjusted Error All Temperatures +/-0.100°F 0.100 180 = +/-0.007 o F

3. Software The conversion error from resistance (in ohms) to temperature (in °F) is not applicable. The conversion equations used in the EDS computer are the same as the equations used to compute test temperatures during the sensor calibration.

a. Final rounding of hourly average values= +/-0.005°F.

This value applies to both the instantaneous and time-averaged data channels.

The software reports the temperature to the nearest 0.01°F. This gives a maximum rounding error of +/-0.005°F.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 33 of 65 2.4.2 AIR TEMPERATURE SYSTEM ACCURACY (continued)

This is a random error since the value reported may be on either side of the actual temperature. The number of readings is assumed to be 1 because the calculation is performed on the single final value before it is reported.

System Accuracy Calculations (Instantaneous Data Channel)

All Temperatures:

(high (0.078)2 + (0.045)2 + (0.150 )2 + (0.100 )2 + (0.005)2 + 0.500 = +0.702 o F solar)

(low (0.078)2 + (0.045)2 + (0.150 )2 + (0.100 )2 + (0.005)2 0.000 = 0.202 o F solar)

(no (0.078)2 + (0.045)2 + (0.150 )2 + (0.100 )2 + (0.005)2 +/- 0.000 = +/-0.202 o F solar)

System error satisfies RG-1.23 and ANS-3.11 specifications for all temperatures.

System Accuracy Calculations (Time-Averaged Data Channel)

All Temperatures:

(high (0.006 )2 + (0.045)2 + (0.150 )2 + (0.007 )2 + (0.005)2 + 0.500 = +0.657 o F solar)

(low (0.006 )2 + (0.045)2 + (0.150 )2 + (0.007 )2 + (0.005)2 0.000 = 0.157 o F solar)

(no (0.006 )2 + (0.045)2 + (0.150 )2 + (0.007 )2 + (0.005)2 +/- 0.000 = +/-0.157 o F solar)

System error satisfies RG-1.23 and ANS-3.11 specifications for all temperatures.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 34 of 65 2.5 VERTICAL TEMPERATURE DIFFERENCE VARIABLE: Vertical Temperature Difference - T (Paired Weed Instrument Company, Model 101, R0 = 100 RTDs)

MEASUREMENT METHOD: Computed from pair of hourly average air temperature values VALID DATA RANGE: n/a; (T is valid if both temperature values are valid)

CALIBRATED RANGE: -10.00°F to +110.00°F; (Matched RTD sets are checked at calibration points)

NUMBER OF SAMPLES ASSUMED: 180 samples in 15 minutes REQUIREMENTS SPECIFICATIONS ANSI/ANS-3.11-2005 * +/-0.180°F for all temperatures RG-1.23 (Revision 1) * +/-0.180°F for all temperatures POTENTIAL SOURCES OF ERROR - SENSOR ERROR (°F)

1. All SENSOR ACCURACY Samples Temps A. Sensor Calibration

1. Input

a. Standard --- ---

b. Test position 1 +/-0.000

2. Output

a. Measurement/Readout device 1 +/-0.018

b. Tolerance 1 +/-0.050 B. Sensor Drift 1 +/-0.090 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/- 0.105 Specification (°F) +/-0.180 Meets Specifications? Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 35 of 65 2.5 VERTICAL TEMPERATURE DIFFERENCE (continued)

POTENTIAL SOURCES OF ERROR - INSTANTANEOUS ERROR (°F)

1. All SYSTEM ACCURACY Samples Temps A. SENSOR ERROR (+/- 0.105°F from above) 1 +/-0.105 B. SAMPLING ERRORS

• Solar heating 1 +/-0.090 C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- ---

(2) Test meter/ transfer standard 1 +/-0.000 (3) Test position --- ---

b. Output tolerance 1 +/-0.045

2. Processing Hardware Drift

b. Data Acquisition Switch Unit 1 +/-0.027

3. Software

a. Rounding of final average value 1 +/-0.005 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.148 Specification (°F) +/-0.180 Meets Specifications? Yes POTENTIAL SOURCES OF ERROR - TIME-AVERAGED ERROR (°F)

1. All SYSTEM ACCURACY Samples Temps A. SENSOR ERROR (+/- 0.105°F from above) 180 +/-0.008 B. SAMPLING ERRORS

• Solar heating 180 +/-0.007 C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- ---

(2) Test meter/ transfer standard 1 +/-0.000 (3) Test position --- ---

b. Output tolerance 1 +/-0.045

2. Processing Hardware Drift

b. Data Acquisition Switch Unit 180 +/-0.002

3. Software

a. Rounding of final average value 1 +/-0.005 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.046 Specification (°F) +/-0.180 Meets Specifications? Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 36 of 65 2.5 VERTICAL TEMPERATURE DIFFERENCE (continued)

VERTICAL TEMPERATURE DIFFERENCE, ERROR SOURCE/VALUE EXPLANATION Both ANSI/ANS-3.11-2005 and RG-1.23 (Revision 1) use a specification of +/-0.180°F for all temperature differences.

2.5.1 VERTICAL TEMPERATURE DIFFERENCE SENSOR ACCURACY A. Sensor Calibration RTDs are calibrated in the Laboratory. Each set of three RTDs is tested at three temperatures and a calibration equation is determined for each RTD.

This calibration is coincidental with the RTD calibration for air temperature and differs only in the criteria used to evaluate the calibration results. For air temperature the resulting calibration equation of each RTD must produce the actual temperature within 0.05°F. For vertical temperature difference the equations of all RTDs must produce the same temperature within 0.05°F.

RTDs are calibrated in sets of three, with all three RTDs being subjected simultaneously to the same calibration medium.

1. Input Checked for differential at 0°C, 40°C, and 100°C (32°F, 104°F, and 212°F).

a. Standard = Not Applicable (N/A).

No standard of temperature difference is used other than the temperature baths, which hold the RTDs to almost exactly the same temperature at each test point. Even though a standard is used to register the temperature at each calibration, the main requirement here is that all RTDs be at the same temperature.

b. Test position = +/-0.000°F.

There is virtually no temperature gradient in the constant temperature bath since the bath is well-mixed and data are stabilized before measurements.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 37 of 65 2.5.1 VERTICAL TEMPERATURE DIFFERENCE SENSOR ACCURACY (continued)

2. Output

a. Measurement/Readout device = +/-0.018°F.

The Azonix A1011 resistance temperature detector (RTD) thermometer used to measure sensor RTD temperatures has an accuracy of 0.01°C (0.018°F) based on manufacturer specifications.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

b. Tolerance = +/-0.050°F.

The outputs of this calibration are calibration equations for the three sensor RTDs and several test temperatures computed with the equations. The computed temperatures are compared with true temperatures to check the performance of the equations. The maximum allowable error is +/-0.05°F (CLS Calibration Instruction 450.01-005).

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

B. Sensor Drift = +/-0.090°F.

This drift concerns the relative change between any pair of RTDs of the set in 184 days (CLS Calibration Instruction 450.01-005).

The tolerance for a single RTD is +/-0.01 ohm, and therefore it is double that, or +/-0.02 ohm, for a pair.

1. 0.02 ohm @ 4.5°F/ohm = +/-0.090°F.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

Sensor Accuracy Calculations All Temperatures: (0.000)2 + (0.018)2 + (0.050 )2 + (0.090 )2 +/- 0.000 = +/-0.105 o F Sensor error satisfies RG-1.23 and ANS-3.11 specifications for all temperatures.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 38 of 65 2.5.2 VERTICAL TEMPERATURE DIFFERENCE SYSTEM ACCURACY A. SENSOR ERROR

1. Instantaneous Data Channel [All temperatures] = +/-0.105°F.

2. Time-Averaged Data Channel [All temperatures] = +/-0.008°F.

The sensor error values used in the system error are based on the calculated sensor error and adjusted for the number of samples used to determine the final reported value.

This is a random error since the value reported may be on either side of the actual temperature. The number of readings is assumed to be 180 because that is the number of samples used for a 15-minute data value.

Temperature Random Error Time-adjusted Error All Temperatures +/-0.105°F +/- 0.105 180 = +/-0.008 o F B. SAMPLING ERRORS Solar heating of aspirator

1. Instantaneous Data Channel [All temperatures] = +/-0.090°F.

2. Time-Averaged Data Channel [All temperatures] = +/-0.007°F.

The sampling errors concern unequal solar heating of the sensors.

This is a random error since the value reported may be either negative or positive based on the relationship of the actual temperatures. The number of readings is assumed to be 180 because that is the number of samples used for a 15-minute data value.

For temperature difference measurements with identical shields, the manufacturer specifies an error of +/-0.05°C, which corresponds to +/-0.09°F.

Temperature Random Error Time-adjusted Error All Temperatures +/-0.090°F +/- 0.090 180 = +/-0.007 o F

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 39 of 65 2.5.2 VERTICAL TEMPERATURE DIFFERENCE SYSTEM ACCURACY (continued)

C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration This calibration, which includes DASU and computer, is performed every 184 days.

a. Input Calibrated or differential at 94, 104, 114 ohms (1) Input signal tolerance = N/A.

Fixed resistors are used in the Temperature Channel Calibrator and require no settings by the operator.

(2) Test meter or transfer standard = +/-0.000°F.

This value applies to both the instantaneous and time-averaged data channels.

The Temperature Channel Calibrator containing three fixed precision resistors of 94, 104, and 114 ohms is used to calibrate the RTD channels. The same resistor is used on all three RTD channels at each of the three simulated temperatures; therefore an exact zero differential is simulated for each pair.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibration is performed at a single temperature (and is treated as an instantaneous observation).

(3) Test position = N/A.

The Temperature Channel Calibrator is not position sensitive.

b. Output tolerance = +/-0.045°F.

This value applies to both the instantaneous and time-averaged data channels.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 40 of 65 2.5.2 VERTICAL TEMPERATURE DIFFERENCE SYSTEM ACCURACY (continued)

The maximum allowable difference in the resistance readings of the three channels is 0.01 ohm (EPFS-6).

0.01 ohm @ 4.5°F/ohm = +/-0.045°F.

Note: In this procedure each channel also produces temperatures calculated from its readings of the fixed resistors. These temperatures are not expected to be exactly the same for all channels because the channels use different equations.

Therefore, the calibration is determined based on the resistance readings and not the temperature readings.

This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibration is performed at a single temperature (and is treated as an instantaneous observation).

2. Processing Hardware Drift Drift error is for at least 184 days and +/-5°C because the air temperature measurement system is re-calibrated each 184 days and the building temperature is controlled within +/-5°C.

a. Data Acquisition Switch Unit (1) Instantaneous Data Channel [All temperatures] = +/-0.027°F.

(2) Time-Averaged Data Channel [All temperatures] = +/-0.002°F.

For the DASU, the relays give an offset of 0.003 mV (3uV) for each RTD channel. Two channels are involved in each temperature difference measurement, so 0.006 mV is the maximum total error. Given the test current of 1 mA on the 1.00 Kohm scale, this translates into a resistance error of 0.006 ohm.

This is a random error since the value reported may be on either side of the actual temperature. The number of readings is assumed to be 180 because that is the number of samples used for a 15-minute data value.

Converting from ohms to degrees (using a typical scale factor):

0.006 ohm @ 4.5°F/ohm = +/-0.027°F.

Temperature Random Error Time-adjusted Error All Temperatures +/-0.027°F +/- 0.027 180 = +/-0.002 o F

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 41 of 65 2.5.2 VERTICAL TEMPERATURE DIFFERENCE SYSTEM ACCURACY (continued)

3. Software

a. Final rounding of hourly average values = +/-0.005°F.

This value applies to both the instantaneous and time-averaged data channels.

Rounding of the final data to the nearest 0.01°F causes an error of +/-0.005°F.

This is a random error since the value reported may be on either side of the actual temperature. The number of readings is assumed to be 1 because the calculation is performed on the single final value before it is reported.

System Accuracy Calculations (Instantaneous Data Channel)

All Temperatures:

(0.105)2 + (0.090 )2 + (0.000 )2 + (0.045)2 + (0.027 )2 + (0.005)2 +/- 0.000 = +/-0.148 o F System error satisfies RG-1.23 and ANS-3.11 specifications for all temperatures.

System Accuracy Calculations (Time-Averaged Data Channel)

All Temperatures:

(0.008)2 + (0.007 )2 + (0.000 )2 + (0.045)2 + (0.002 )2 + (0.005)2 +/- 0.000 = +/-0.046 o F System error satisfies RG-1.23 and ANS-3.11 specifications for all temperatures.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 42 of 65 2.6 DEWPOINT TEMPERATURE VARIABLE: Dewpoint Temperature (Vaisala HMT337)

MEASUREMENT METHOD: Capacitive humidity sensor with warmed probe head VALID DATA RANGE: -4.00°F to +85.00°F CALIBRATED RANGE: +34.00°F to +81.00°F NUMBER OF SAMPLES ASSUMED: 720 samples in 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> REQUIREMENTS SPECIFICATIONS ANSI/ANS-3.11-2005 * +/-2.700°F for all dewpoints RG-1.23 (Revision 1) * +/-2.700°F for all dewpoints POTENTIAL SOURCES OF ERROR - SENSOR ERROR (°F)

1. All SENSOR ACCURACY Samples Dewpoints A. Sensor Calibration 1 +/-2.000

1. Input

a. Standard --- ---

b. Test position --- ---

2. Output

a. Measurement/Readout device --- ---

b. Tolerance --- ---

B. Sensor Drift 1 +/-1.000 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/- 2.236 Specification (°F) +/-2.700 Meets Specifications? Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 43 of 65 2.6 DEWPOINT TEMPERATURE (continued)

SYSTEM ACCURACY (INSTANTANEOUS) is not calculated since instantaneous dewpoint data are not reported.

POTENTIAL SOURCES OF ERROR - TIME-AVERAGED ERROR (°F)

1. All SYSTEM ACCURACY Samples Dewpoints A. SENSOR ERROR (+/- 2.236°F from above) 720 +/-0.083 B. SAMPLING ERRORS C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- ---

(2) Test meter/ transfer standard 1 +/-0.000 (3) Test position --- ---

b. Output tolerance 1 +/-0.500

2. Processing Hardware Drift

a. Data Acquisition Switch Unit 720 +/-0.000

3. Software

a. Rounding of final average value 1 +/-0.005 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.507 Specification (°F) +/-2.700 Meets Specifications? Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 44 of 65 2.6 DEWPOINT TEMPERATURE (continued)

DEWPOINT, ERROR SOURCE/VALUE EXPLANATION Both ANSI/ANS-3.11-2005 and RG-1.23 (Revision 1) use a specification of +/-2.700°F for all dewpoint values.

2.6.1 DEWPOINT TEMPERATURE SENSOR ACCURACY A. Sensor Calibration = +/-2.000°F.

The Vaisala HMT337 Humidity and Temperature Transmitter is calibrated an environmental chamber at 34°F, 50°F, 68°F, and 86°F, and adjusted to satisfy the conversion equation used in the data logger program. The calibration includes the 500-ohm resistor that converts the mA signal from the sensor to a voltage signal transmitted to the data logger. The calibration report assumes a dewpoint accuracy of

+/-2 °F.

This is a random error since the value reported may be on either side of the actual solar radiation. The number of readings is assumed to be 1 because calibrations are performed at a single radiation value during a specific round of tests (and is treated as an instantaneous observation).

1. Input Included in the laboratory calibration error.

a. Standard = Not Applicable (N/A).

b. Test position = N/A.

2. Output Included in the laboratory calibration error.

a. Measurement/Readout device = N/A.

b. Tolerance = N/A.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 45 of 65 2.6.1 DEWPOINT TEMPERATURE SENSOR ACCURACY (continued)

B. Sensor Drift = +/-1.000°F.

Based on manufacturer literature for Relative Humidity Error, the following error limits apply for the expected operational range of the HMT337.

Air Relative Relative Humidity Dewpoint Temperature Humidity Error Error

(°F) (%) (%) (°F) 32 30 +/-1.0 0.731 90 +/-1.7 0.465 100 +/-1.7 0.424 50 30 +/-1.0 0.790 90 +/-1.7 0.505 100 +/-1.7 0.460 68 30 +/-1.0 0.850 90 +/-1.7 0.547 100 +/-1.7 0.498 86 30 +/-1.0 0.913 90 +/-1.7 0.590 100 +/-1.7 0.537 Within this range, the greatest value is +/-0.913°F. This is rounded to +/-1.000°F This is a random error since the value reported may be either above or below the actual temperature. The number of readings is assumed to be 1 because calibrations are performed at a single temperature during a specific round of tests (and is treated as an instantaneous observation).

Sensor Accuracy Calculations All Dewpoints: (2.000)2 + (1.000 )2 +/- 0.000 = +/-2.236 o F Sensor error satisfies RG-1.23 and ANS-3.11 specifications for all dewpoints.

2.6.2 DEWPOINT TEMPERATURE SYSTEM ACCURACY SYSTEM ACCURACY (INSTANTANEOUS) is not calculated since instantaneous data are not reported.

A. SENSOR ERROR

1. [All Dewpoints] = +/-0.083°F.

The sensor error values used in the system error are based on the calculated sensor error and adjusted for the number of samples used to determine the final reported value.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 46 of 65 2.6.2 DEWPOINT TEMPERATURE SYSTEM ACCURACY (continued)

This is a random error since the value reported may be on either side of the actual dewpoint. The number of readings is assumed to be 720 because that is the number of samples used for a 1-hour data value.

Dewpoint Random Error Time-adjusted Error All Dewpoints +/-2.236°F +/- 2.236 720 = +/-0.083 o F B. SAMPLING ERRORS Sampling Errors = N/A.

The Vaisala HMT337 sensor directly samples the atmosphere and performs all processing at the sampling site. No significant sampling errors have been identified.

C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration The channel calibration is performed by instructing the sensor to send a specific electronic value and verifying that the correct corresponding dewpoint value is reported.

a. Input (1) Input signal tolerance = NA.

(2) Test meter or transfer standard = +/-0.000°F.

The sensor sends a specific electronic value.

(3) Test position = N/A.

b. Output tolerance = +/-0.050°F.

This is a random error since the value reported may be on either side of the actual dewpoint. The number of readings is assumed to be 1 because the calibration takes place at a specific time (and is treated as an instantaneous observation)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 47 of 65 2.6.2 DEWPOINT TEMPERATURE SYSTEM ACCURACY (continued)

2. Processing Hardware Drift

a. Data Acquisition Switch Unit = +/-0.000°F.

For the DASU, the 1-year drift on the 10 V range has a specification of 0.0035 percent of reading plus 0.0005 percent of the range. With the maximum reading of 10.000 V (85°F dewpoint), this yields:

(10.000 V x 0.0035%) + (10 V x 0.0005%)

= 0.00035 V + 0.00005 V

= 0.0004 V.

The dewpoint calibration formula is:

dewpo int = (voltage 11.125) 26.25 Based on this formula, the dewpoint changes 11.125°F for each 1 volt change. Therefore, the DASU error is:

0.0004 volt x 11.125°F/volt = 0.0045°F -- rounded up to 0.005°F.

This is a random error since the value reported may be on either side of the actual dewpoint. The number of readings is assumed to be 720 because that is the number of samples used for a 1-hour data value.

Dewpoint Random Error Time-adjusted Error All Dewpoints +/-0.005°F +/- 0.005 720 = +/-0.000 o F

3. Software

a. Final rounding of hourly average values = +/-0.005°F.

Rounding of the final data to the nearest 0.01°F causes an error of +/-0.005°F.

This is a random error since the value reported may be on either side of the actual dewpoint. The number of readings is assumed to be 1 because the calculation is performed on the single final value before it is reported.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 48 of 65 2.6.2 DEWPOINT TEMPERATURE SYSTEM ACCURACY (continued)

SYSTEM ACCURACY (INSTANTANEOUS) is not calculated since instantaneous data are not reported.

System Accuracy Calculations (Time-Averaged Data Channel)

All Dewpoints:

(0.083)2 + (0.000 )2 + (0.500 )2 + (0.000)2 + (0.005)2 +/- 0.000 = +/-0.507 o F System error satisfies RG-1.23 and ANS-3.11 specifications for all dewpoints.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 49 of 65 2.7 RAINFALL VARIABLE: Rainfall (total for 15-minutes and hour)

MEASUREMENT METHOD: Tipping bucket VALID DATA RANGE: 0.00 inch to 10.00 inches (software limit)

• CALIBRATED RANGE: 0.00 inch to 1.00 inch**

NUMBER OF SAMPLES ASSUMED: 1 total at end of each 15-minutes or 1-hour.

• Since the rain gauge measures precipitation as it occurs and does not accumulate a sample, there is no actual upper limit to the data range. A 10.00-inch upper limit is retained in the data logger software primarily for historical continuity and consistency with ICS limits.

• • A 1.00-inch sample is used to verify the correct number of tips is recorded. The calibration addresses the number of the individual tips associated with the sample, not the total sample size.

REQUIREMENTS SPECIFICATIONS ANSI/ANS-3.11-2005 * +/-0.010 inch (10% of volume at 2.54 mm)

RG-1.23 (Revision 1) * +/-0.010 inch (10% of volume at 2.54 mm)

Note: Error estimates apply to a volume of 2.54 mm (0.10 inch).

SOURCES OF ERROR - SENSOR POTENTIAL ERROR ACCURACY # Samples 0.10 inch A. Sensor Calibration

1. Input

a. Standard 1 +/-0.001

b. Test position --- ---

2. Output

a. Measurement/Readout device --- ---

b. Tolerance 1 +/-0.004 B. Sensor Drift 2 +/-0.006 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/- 0.007 Specification (inch) +/-0.010 Meets Specifications? Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 50 of 65 2.7 RAINFALL (continued)

SOURCES OF ERROR - INSTANTANEOUS POTENTIAL ERROR SYSTEM ACCURACY # Samples 0.10 inch A. SENSOR ERROR (+/- 0.007 inch from above) 1 +/-0.007 B. SAMPLING ERRORS

• Misreporting of Rainfall Times 1 +/-0.005 C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance --- ---

(2) Test meter/ transfer standard --- ---

(3) Test position --- ---

b. Output tolerance 1 +/-0.000

2. Processing Hardware Drift

b. Data Acquisition Switch Unit 1 +/-0.000

3. Software

a. Rounding of final average value --- ---

ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.009 Specification (inch) +/-0.010 Meets Specifications? Yes SYSTEM ACCURACY (TIME-AVERAGED) is not calculated since only instantaneous data are reported.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 51 of 65 2.7 RAINFALL (continued)

RAINFALL, ERROR SOURCE/VALUE EXPLANATION Both ANSI/ANS-3.11-2005 and RG-1.23 (Revision 1) use a specification of 10% percent of volume specification for estimating rainfall accuracy at a single point (2.54 mm, 0.10 inch).

All error calculations are adjusted to a 0.10-inch sample.

2.7.1 RAINFALL SENSOR ACCURACY A. Sensor Calibration The sensor is calibrated in-place as part of the system calibration. A known amount of water is allowed to enter the sensor at a constant rate. The sensor output is compared with the amount of water that enters the sensor.

1. Input

a. Standard = +/-0.001 inch.

The Model 60103 Precipitation Gauge Calibrator consists of plastic bottle to hold water, a stand to set the bottle in the gauge funnel, and a constant-flow orifice assembly (to control flow rate at 2 inches/hour). The amount of water in the bottle (equivalent to 1 inch of rain) will equal 100 tips of the tipping bucket assembly (1 tip equals 0.01 inch).

The correct amount of water in the bottle is verified by weighing the bottle on a digital scale. The +/-2 gram limit in EPFS-6 corresponds to 0.0025 inch (25% of 1 tip). This is rounded up to +/-1 tip (+/-0.01 inch). When prorated to 0.1 inch this results in an error value of +/-0.001 inch.

This is a random error since the value reported may be on either side of the actual precipitation. The number of readings is assumed to be 1 because calibrations are performed at a single time.

b. Test position = Not Applicable (N/A).

The sensor is calibrated in the field by simulating rainfall falling into the rain gauge.

2. Output Included in system calibration.

a. Measurement/Readout device = N/A.

The number of counts recorded exactly match the number of tips.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 52 of 65 2.7.1 RAINFALL SENSOR ACCURACY (continued)

b. Tolerance = +/-0.004 inch.

The maximum allowable error is +/-4 tips for a 100-tip water sample. This corresponds to +/-0.004 inch for a 0.10 inch sample.

This is a random error since the value reported may be on either side of the actual precipitation. The number of readings is assumed to be 1 because calibrations are performed at a single time.

B. Sensor Drift = +/-0.006 inch.

The sensor drift is based on the maximum difference between two consecutive calibrations (representing the difference between the extreme positive and extreme negative error).

This is a random error since the value reported may be on either side of the actual precipitation. The number of readings is assumed to be 2 because it represents a difference between 2 calibrations.

Since the maximum allowable error for a calibration is +/-4 tips, the maximum difference would be twice this value or 8 tips. This corresponds to +/-0.008 inch.

Rainfall Random Error Time-adjusted Error 1.00 inch +/-0.008°F +/- 0.008 2 = +/-0.006 inch Sensor Accuracy Calculations 0.10 inch: (0.001)2 + (0.004)2 + (0.006)2 +/- 0.000 = +/-0.007 inch Sensor error satisfies RG-1.23 and ANS-3.11 specifications for rainfall.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 53 of 65 2.7.2 RAINFALL SYSTEM ACCURACY SYSTEM ACCURACY (TIME-AVERAGE) is not calculated since only instantaneous data are reported.

A. SENSOR ERROR

1. Instantaneous Data Channel [0.10 inch] = +/-0.007 inch.

The sensor error values used in the system error are based on the calculated sensor error and adjusted for the number of samples used to determine the final reported value.

This is a random error since the value reported may be on either side of the actual rainfall. The number of readings is assumed to be 1 because the data value is determined at the end of the sampling period.

B. SAMPLING ERRORS Misreporting of Rainfall Times

1. Instantaneous Data Channel [0.10 inch] = +/-0.005 inch.

Occasionally, accumulated precipitation is not sufficient to cause the tipping mechanism to operate. In such a case, the precipitation will not be reported until additional precipitation causes the tipping mechanism to operate. Since the sensor only tips when 0.01 inches of precipitation occurs, the earlier time may be under-reported by up to 0.01 inches and the later time may be over-reported by up to 0.01 inches. Since the precipitation amount contained in a untipped bucket can be anywhere in the range 0.00-0.01 inch, the midpoint value of 0.005 inch is assumed.

This is a random error since the value reported may be on either side of the actual precipitation. The number of readings is assumed to be 1 because only a single occurrence can be included in each sample (the assumed rainfall is reset to 0.00 at the start of each sampling period).

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 54 of 65 2.7.2 RAINFALL SYSTEM ACCURACY (continued)

C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration The sensor is calibrated in-place as part of the system calibration.

a. Input (1) Input signal tolerance = N/A.

(2) Test meter or transfer standard = N/A.

(3) Test position = N/A.

b. Output tolerance = +/-0.000 inch.

The number of counts exactly matches the number of tips.

2. Processing Hardware Drift

a. Data Acquisition Switch Unit = +/-0.000 inch.

No drift applies since signal quality is not significant, only the ON/OFF state of the signal to the counter. The counter error = 0.000 inch since the number of counts exactly matches the number of rain gauge tips.

3. Software

a. Final rounding of hourly average values = N/A.

No rounding occurs since the data are recorded in fixed increments.

System Accuracy Calculations (Instantaneous Data Channel) 0.10 inch: (0.007 )2 + (0.005)2 + (0.000 )2 + (0.000 )2 +/- 0.000 = +/-0.009 inch System error satisfies RG-1.23 and ANS-3.11 specifications for rainfall.

SYSTEM ACCURACY (TIME-AVERAGE) is not calculated since only instantaneous data are reported.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 55 of 65 2.8 SOLAR RADIATION VARIABLE: Solar Radiation (hourly average)

MEASUREMENT METHOD: Direct reading of Eppley Model 8-48 B/W Pyranometer VALID DATA RANGE: 0.00 ly/min to 3.00 ly/min CALIBRATED RANGE: 0.00 ly/min to 3.00 ly/min NUMBER OF SAMPLES ASSUMED: 720 samples in 60 minutes REQUIREMENTS SPECIFICATIONS ANSI/ANS-3.11-2005 * +/-0.014 ly/min for solar < 0.28 ly/min

• +/-5% of observed for solar 0.28 ly/min RG 1.23 (Revision 1)

• Not Specified SOURCES OF ERROR - SENSOR POTENTIAL ERROR (mph)

1. 0.28 0.45 1.50 SENSOR ACCURACY Samples ly/min ly/min ly/min A. Sensor Calibration 1 +/-0.003 +/-0.005 +/-0.015

1. Input

a. Standard --- --- --- ---

b. Test position [bias] --- --- --- ---

2. Output

a. Measurement/Readout device --- --- --- ---

b. Tolerance --- --- --- ---

B. Sensor Drift 1 +/-0.005 +/-0.007 +/-0.023 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.006 +/-0.009 +/-0.027 Specification (ly/min) +/-0.014 +/-0.023 +/-0.075 Meets Specifications? Yes Yes Yes

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 56 of 65 2.8 SOLAR RADIATION (continued)

SYSTEM ACCURACY (INSTANTANEOUS) is not calculated since instantaneous solar radiation data are not reported.

SOURCES OF ERROR - TIME-AVERAGED POTENTIAL ERROR (mph)

1. 0.28 0.45 1.50 SYSTEM ACCURACY Samples ly/min ly/min ly/min A. SENSOR ERROR (from above)

+/-0.006 720 +/-0.000

+/-0.015 720 +/-0.001

+/-0.027 720 +/-0.001 B. SAMPLING ERRORS

• Cosine response (0-70° zenith angle) 720 +/-0.001 +/-0.000 +/-0.001

• Temperature sensitivity 720 +/-0.000 +/-0.000 +/-0.001 C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration

a. Input (1) Input signal tolerance 1 +/-0.014 +/-0.014 +/-0.014 (2) Test meter/ transfer standard 1 +/-0.007 +/-0.007 +/-0.007 (3) Test position --- --- --- ---

b. Output tolerance 1 +/-0.013 +/-0.015 +/-0.020

2. Processing Hardware Drift

a. Data Acquisition Switch Unit 720 +/-0.000 +/-0.000 +/-0.000

3. Software

a. Rounding of final average value 1 +/-0.005 +/-0.005 +/-0.005 ROOT-SUM-SQUARE ERROR (with bias adjustments) +/-0.021 +/-0.022 +/-0.026 Specification (ly/min) +/-0.014 +/-0.023 +/-0.075 Meets Specifications? No

• Yes Yes

• 0.45 ly/min is the lowest value at which the ANS-3.11-2005 specification is satisfied.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 57 of 65 2.8 SOLAR RADIATION (continued)

SOLAR RADIATION, ERROR SOURCE/VALUE EXPLANATION ANS-3.11 uses a two-part specification for solar radiation accuracya constant value of 10 w/m2 (0.014 ly/min) for all measurements 200 w/m2 (0.28 ly/min) and below, and a 5% of observed value for all measurements above 200 w/m2 (0.28 ly/min).

RG-1.23 does not have a specification for solar radiation.

To encompass the full range of expected conditions, accuracy is calculated for 3 levels of solar radiation:

• 0.28 ly/min -- This is the breakpoint between the constant value used for low-solar ranges and the 5% value used for higher ranges.

• 0.45 ly/min -- This is the lowest value at which TVA observed accuracy satisfies the ANS-3.11 specification.

• 1.50 ly/min -- This is the maximum value that the TVA measurement system is expected to report and is the upper limit for the range over which the 5% error requirement applies.

Since the error relationship is linear over the range from 0.45 ly/min to 1.50 ly/min, all requirements within the range will be satisfied if requirements are satisfied at the upper and lower limits of the range.

2.8.1 SOLAR RADIATION SENSOR ACCURACY A. Sensor Calibration

1. [0.28 ly/min] = +/-0.003 ly/min.

2. [0.45 ly/min] = +/-0.005 ly/min.

3. [1.50 ly/min] = +/-0.015 ly/min.

Sensor calibration is performed by the manufacturer (Eppley Laboratory). The specified linearity accuracy is +/-1% (based on manufacturer specifications).

1% x 0.28 ly/min = +/-0.0028 ly/min - rounded up to 0.003 ly/min.

1% x 0.45 ly/min = +/-0.0045 ly/min - rounded up to 0.005 ly/min.

1% x 1.50 ly/min = +/-0.015 ly/min.

This is a random error since the value reported may be on either side of the actual solar radiation. The number of readings is assumed to be 1 because calibrations are performed at a single radiation value during a specific round of tests (and is treated as an instantaneous observation).

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 58 of 65 2.8.1 SOLAR RADIATION SENSOR ACCURACY (continued)

4. Input Included in manufacturer's calibration error.

a. Standard = Not Applicable (N/A).

b. Test position = N/A.

5. Output Included in manufacturer's calibration error.

a. Measurement/Readout device = N/A.

b. Tolerance = N/A.

B. Sensor Drift

1. [0.14 ly/min] = +/-0.005 ly/min.

2. [0.45 ly/min] = +/-0.007 ly/min.

3. [1.50 ly/min] = +/-0.023 ly/min.

Sensor changeout frequency is a maximum of 12 months (EPFS-4). Based on factory reports of sensors calibrated during 1994-1999, drift is expected to be less than 1.5%.

1.5% x 0.28 ly/min = +/-0.0042 ly/min - rounded up to 0.005 ly/min.

1.5% x 0.45 ly/min = +/-0.0068 ly/min - rounded up to 0.007 ly/min.

1.5% x 1.50 ly/min = +/-0.0225 ly/min - rounded up to 0.023 ly/min.

This is a random error since the value reported may be on either side of the actual solar radiation. The number of readings is assumed to be 1 because calibrations are performed at a single radiation value during a specific round of tests (and is treated as an instantaneous observation).

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 59 of 65 2.8.1 SOLAR RADIATION SENSOR ACCURACY (continued)

Sensor Accuracy Calculations 0.28 ly/min: (0.003)2 + (0.005)2 +/- 0.000 = +/-0.006 ly / min 0.45 ly/min: (0.005)2 + (0.007 )2 +/- 0.000 = +/-0.009 ly / min 1.50 ly/min: (0.015)2 + (0.023)2 +/- 0.000 = +/-0.027 ly / min Sensor error satisfies ANS-3.11 specification for all solar radiation values.

RG-1.23 has no specification for solar radiation.

2.8.2 SOLAR RADIATION SYSTEM ACCURACY SYSTEM ACCURACY (INSTANTANEOUS) is not calculated since instantaneous data are not reported.

A. SENSOR ERROR Time-Averaged Data Channel

1. [0.28 ly/min] = +/-0.000 ly/min.

2. [0.45 ly/min] = +/-0.000 ly/min.

3. [1.50 ly/min] = +/-0.001 ly/min.

The sensor error values used in the system error are based on the calculated sensor errors and adjusted for the number of readings used to determine the final reported value.

This is a random error since the value reported may be either above or below the actual solar radiation. The number of readings is assumed to be 720 because that is the number of samples used for a 1-hour data value.

Solar Radiation Random Error Time-adjusted Error 0.28 ly/min +/-0.006 ly/min +/- 0.006 720 = +/-0.000 ly / min 0.45 ly/min +/-0.009 ly/min +/- 0.009 720 = +/-0.000 ly / min 1.50 ly/min +/-0.027 ly/min +/- 0.027 720 = +/-0.001 ly / min

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 60 of 65 2.8.2 SOLAR RADIATION SYSTEM ACCURACY (continued)

B. SAMPLING ERROR

1. Cosine response Time-Averaged Data Channel

[0.28 ly/min] = +/-0.001 ly/min.

[0.45 ly/min] = +/-0.000 ly/min.

[1.50 ly/min] = +/-0.001 ly/min.

Eppley Laboratory specifies that the sensor has a cosine response +/-2% from 0° to 70° and +/-5% from 70° to 80° (At zenith angles greater than 80°, the sun will be close to the horizon and actual radiation levels will be too low for error contribution from cosine response to be significant).

Zenith angles 0° to 70° are assumed to apply to any solar radiation 0.30 ly/min and higher. Zenith angles 70° to 80° are assumed to apply to any solar radiation below 0.30 ly/min.

[0.28 ly/min] 5% x 0.28 ly/min = +/-0.014 ly/min.

[0.45 ly/min] 2% x 0.45 ly/min = +/-0.009 ly/min.

[1.50 ly/min] 2% x 1.50 ly/min = +/-0.030 ly/min.

This is a random error since the value reported may be either above or below the actual solar radiation. The number of readings is assumed to be 720 because that is the number of samples used for a 1-hour data value.

Solar Radiation Random Error Time-adjusted Error 0.28 ly/min +/-0.014 ly/min +/- 0.014 720 = +/-0.001 ly / min 0.45 ly/min +/-0.009 ly/min +/- 0.009 720 = +/-0.000 ly / min 1.50 ly/min +/-0.030 ly/min +/- 0.030 720 = +/-0.001 ly / min

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 61 of 65 2.8.2 SOLAR RADIATION SYSTEM ACCURACY (continued)

2. Temperature sensitivity Time-Averaged Data Channel

[0.28 ly/min] = +/-0.000 ly/min.

[1.30 ly/min] = +/-0.000 ly/min.

[1.50 ly/min] = +/-0.001 ly/min.

Eppley Laboratory specifies that the sensor has a temperature dependence of

+/-1.5% from -20 to 40°C.

1.5% x 0.28 ly/min = +/-0.0042 ly/min - rounded up to 0.005 ly/min.

1.5% x 0.45 ly/min = +/-0.0068 ly/min - rounded up to 0.007 ly/min.

1.5% x 1.50 ly/min = +/-0.0225 ly/min - rounded up to 0.023 ly/min.

This is a random error since the value reported may be either above or below the actual solar radiation. The number of readings is assumed to be 720 because that is the number of samples used for a 1-hour data value.

Solar Radiation Random Error Time-adjusted Error 0.28 ly/min +/-0.005 ly/min +/- 0.005 720 = +/-0.000 ly / min 0.45 ly/min +/-0.007 ly/min +/- 0.007 720 = +/-0.000 ly / min 1.50 ly/min +/-0.023 ly/min +/- 0.023 720 = +/-0.001 ly / min

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 62 of 65 2.8.2 SOLAR RADIATION SYSTEM ACCURACY (continued)

C. SIGNAL CONDITIONING ERRORS

1. Channel Calibration Includes DASU and computer.

a. Input (1) Input signal tolerance [entire range] = +/-0.014 ly/min.

Tolerance is +/-0.1 mV (EPFS-6). The nominal output of a Black/White Pyranometer at 1 ly/min is 7 mV; therefore, the nominal scale factor is 0.14 ly/min/mV.

This is a random error since the value reported may be on either side of the actual solar radiation. The number of readings is assumed to be 1 because calibrations are performed at a single radiation value during a specific round of tests (and is treated as an instantaneous observation).

0.1 mV x 0.14 ly/min/mV = +/-0.014 ly/min.

(2) Test meter or transfer standard = +/-0.007 ly/min.

The test DVM accuracy is +/-0.05 mV or better (EPFS-6).

This is a random error since the value reported may be on either side of the actual solar radiation. The number of readings is assumed to be 1 because calibrations are performed at a single radiation value during a specific round of tests (and is treated as an instantaneous observation).

0.05 mV x 0.14 ly/min/mV = +/-0.007 ly/min.

(3) Test position = N/A.

No component involved in this calibration is position sensitive.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 63 of 65 2.8.2 SOLAR RADIATION SYSTEM ACCURACY (continued)

b. Output tolerance Time-Averaged Data Channel (1) [0.28 ly/min] = +/-0.013 ly/min.

(2) [0.45 ly/min] = +/-0.015 ly/min.

(3) [1.30 ly/min] = +/-0.020 ly/min.

The tolerance is +/-0.01 ly/min for 0.00 ly/min and +/-0.02 ly/min for 1.00 ly/min and above (EPFS-6).

This is a random error since the value reported may be on either side of the actual solar radiation. The number of readings is assumed to be 1 because calibrations are performed at a single radiation value during a specific round of tests (and is treated as an instantaneous observation).

For 0.28 ly/min, the interpolated tolerance is +/-0.0128 ly/min -

rounded up to 0.013 ly/min.

For 0.45 ly/min, the interpolated tolerance is +/-0.0145 ly/min -

rounded up to 0.015 ly/min.

For 1.50 ly/min, the tolerance is +/-0.020 ly/min.

2. Processing Hardware Drift

a. Data Acquisition Switch Unit Time-Averaged Data Channel (1) [0.14 ly/min] = +/-0.000 ly/min.

(2) [0.45 ly/min] = +/-0.000 ly/min.

(3) [1.50 ly/min] = +/-0.000 ly/min.

For the DASU, the 1-year drift on the 100 mV range has a specification of 0.0050 percent of reading plus 0.0040 percent of the range. Assumed scale factor is 1 mV = 0.14 ly/min.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 64 of 65 2.8.2 SOLAR RADIATION SYSTEM ACCURACY (continued) 0.28 ly/min corresponds to 2.00 mV. This yields an error value

= (2.00 mV X 0.0050%) + (100 X 0.0040%) mV

= 0.00010 mV + 0.00400 mV = 0.00410 mV.

Converting to langley/minute: 0.00410 mV X 0.14 ly/min/mV

= 0.000574 ly/min -- rounded up to 0.001 ly/min.

0.45 ly/min corresponds to 3.21 mV. This yields an error value

= (3.21 mV X 0.0050%) + (100 X 0.0040%) mV

= 0.00016 mV + 0.0040 mV = 0.00416 mV.

Converting to langley/minute: 0.00416 mV X 0.14 ly/min/mV

= 0.000582 ly/min -- rounded up to 0.001 ly/min.

1.50 ly/min corresponds to 10.71 mV. This yields error value

= (10.71 mV X 0.0050%) + (100 X 0.0040%) mV

= 0.00054 mV + 0.0040 mV = 0.00454 mV.

Converting to langley/minute: 0.00454 mV X 0.14 ly/min/mV

= 0.000636 ly/min -- rounded up to 0.001 ly/min.

This is a random error since the value reported may be either above or below the actual solar radiation. The number of readings is assumed to be 720 because that is the number of samples used for a 1-hour data value.

Solar Radiation Random Error Time-adjusted Error 0.28 ly/min +/-0.001 ly/min +/- 0.001 720 = +/-0.000 ly / min 0.45 ly/min +/-0.001 ly/min +/- 0.001 720 = +/-0.000 ly / min 1.50 ly/min +/-0.001 ly/min +/- 0.001 720 = +/-0.000 ly / min

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-b Rev. 0001 Manual METEOROLOGICAL MONITORING Page 65 of 65 2.8.2 SOLAR RADIATION SYSTEM ACCURACY (continued)

3. Software

a. Final rounding of hourly average values= +/-0.005 ly/min.

Rounding of the final data to the nearest 0.01 ly/min gives a maximum error of +/-0.005 ly/min.

This is a random error since the value reported may be on either side of the actual solar radiation. The number of readings is assumed to be 1 because calibrations are performed at a single radiation value during a specific round of tests (and is treated as an instantaneous observation).

SYSTEM ACCURACY (INSTANTANEOUS) is not calculated since instantaneous data are not reported.

System Accuracy Calculations (Time-Averaged Data Channel) 0.28 ly/min:

(0.000 )2 + (0.001)2 + (0.000 )2 + (0.014 )2 + (0.007 )2 + (0.013)2 + (0.000 )2 + (0.005)2

+/- 0.000 = +/-0.021 ly / min 0.45 ly/min:

(0.000 )2 + (0.000 )2 + (0.000 )2 + (0.014 )2 + (0.007 )2 + (0.015)2 + (0.000 )2 + (0.005)2

+/- 0.000 = +/-0.022 ly / min 1.50 ly/min:

(0.001)2 + (0.001)2 + (0.001)2 + (0.014 )2 + (0.007 )2 + (0.020 )2 + (0.000 )2 + (0.005)2

+/- 0.000 = +/-0.026 ly / min System errors satisfies ANS-3.11 specification for solar radiation for all values to 0.45 ly/min.

RG-1.23 has no specification for solar radiation.

EDS-CRN Clinch River Nuclear Plant Rev. 0001 Module II-c Page 1 of 23 METEOROLOGICAL MONITORING Quality Related ; Yes No Environmental Data Station Manual Effective Date Level of Use: Reference Use Prepared by: Kenneth G. Wastrack (EMA), Meteorologist Reviewed by: < see module II-a > n/a Date

< see module II-a > n/a Concurred by:

Date

< see module II-a > n/a Approved by:

Date

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 2 of 23 Table of Contents 1.0 SCOPE AND FORMAT OF MODULE II.................................................................................... 3 Appendix A: Station Description ................................................................................................ 4 Appendix B: Site Facilities .......................................................................................................... 6 Appendix C: Meteorological Tower Wiring Diagrams ............................................................. 11

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 3 of 23 1.0 SCOPE AND FORMAT OF MODULE II EDS Manual Module II (Meteorological Monitoring) contains an extensive amount of information that cannot be easily presented in a single document. Therefore, this module is divided into three parts:

A. Module II-a Introduction.

Station and Equipment Description.

Equipment Calibration and Maintenance.

Meteorological Data Processing, Validation, and Reporting.

References.

Abbreviations and Definitions.

B. Module II-b Accuracy of Meteorological Measurements.

C. Module II-c Site-specific Appendices.

All three parts of the Module are issued at the same time. Module II-a includes the Cover Page (with approval signatures) and the Revision Log for all three parts.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 4 of 23 Appendix A (Page 1 of 2)

Station Description Site Map

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 5 of 23 Appendix A (Page 2 of 2)

Station Description Sensor Orientation The wind sensor for each level is mounted on a boom that extends towards the southeast

(~140°). The orientation direction enables the maximum amount of data to be collected from directions unobstructed by the tower structure. The wind sensor mounting booms extend 100 inches from the tower, so the sensors are mounted 2.08 tower widths from the tower.

Air temperature sensors are mounted in downward pointing radiation shields that extend towards the east. The sensor inlet is 72 inches from the tower, so the sensors are mounted 1.50 tower widths from the tower. The dewpoint sensors also have downward pointing radiation shields and are mounted approximately 1 meter directly above the air temperature sensors Solar radiation and rainfall sensors are located 55 feet south of the tower with sensor inputs approximately 4 feet above ground level.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 6 of 23 Appendix B (Page 1 of 5)

Site Facilities Type Installed Tower - 360 feet Advance January 1977 Building Portable Building April 2011 SENSOR ELEVATIONS Height Point/Parameter Feet Meters MSL Elevation (feet)

Ground at tower -0.3 -0.09 799.6 Tower base 0.0 0.00 799.9 Rain Gauge (intake) -2.5 -0.76 797.4 Solar Radiation -0.4 -0.12 799.5 10 meter temperature 27.7 8.44 827.6 10 meter wind test sensor 28.5 8.69 828.4 10 meter dewpoint 31.6 9.63 831.5 10 meter wind direction/speed 32.1 9.78 832.0 60 meter temperature 194.3 59.22 994.2 60 meter wind direction/speed 197.2 60.11 997.1 60 meter dewpoint 197.8 60.29 997.7

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 7 of 23 Appendix B (Page 2 of 5)

Site Facilities 1.0 METEOROLOGICAL MONITORING STATION HISTORY Three meteorological towers have been operated at the Clinch River site.

A. Tower 1, which operated during 1973-1978, was a temporary tower at the plant site.

B. Tower 2, which operated during 1977-1978 and 1982-1983, was a 10-meter tower to collect supplemental wind direction/speed. It was discontinued when the Breeder Reactor project was canceled.

C. Tower 3 was operated for 2 different periods.

[Original] During 1977-1978 and 1982-1983, it was the primary tower for the site. It was discontinued (but not removed) when the Breeder Reactor project was canceled.

[Refurbished] Starting in 2011, it was refurbished to collect background data for licensing purposes.

The meteorological sensor heights and elevations for each of these towers are summarized below:

Tower 1 Tower 2 Tower 3 Tower 3 (original) (refurbished)

Height Elevation Height Elevation Height Elevation Height Elevation (ft -gnd) (ft - msl) (ft -gnd) (ft - msl) (ft -gnd) (ft - msl) (ft -gnd) (ft - msl)

Tower Base 0 772 0 852 0 800 0 800 Wind Direction & 200 972 33 885 363 1163 197 997 Wind Speed 75 847 198 998 32 832 35 807 33 833 Air Temperature 200 972 362 1162 194 994 75 847 198 998 28 828 32 804 34 834 Dewpoint 32 804 34 834 198 998 32 832 Precipitation -1 est 799 -1 799 Solar Radiation 0 est 800 0 800 Atmospheric 6 est 806 6 806 Pressure Information is based on station descriptions and survey reports.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 8 of 23 Appendix B (Page 3 of 5)

Site Facilities 2.0 METEOROLOGICAL MONITORING HISTORY (TOWER 1)

Elevation = 235 meters-msl State = Tennessee County = Roane Quad Map = Elverton (130 NW)

Latitude = 35° 53' 20" North Longitude = 84° 23' 10" West UTM Grid = 16 Northing (km) = 3974.58 Easting (km) = 735.95 Height Beginning Ending Data Type Instrument (meters) Date Date Wind Speed & Direction 61 04-11-1973 03-02-1978 Wind Speed & Direction 25 04-11-1973 03-02-1978 Wind Speed & Direction 10 04-03-1974 03-02-1978 Dry-bulb Temperature 61 04-11-1973 03-02-1978 Dry-bulb Temperature 25 04-11-1973 03-02-1978 Dry-bulb Temperature 10 04-03-1974 03-02-1978 Dewpoint Temperature 10 05-15-1975 03-02-1978

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 9 of 23 Appendix B (Page 4 of 5)

Site Facilities 3.0 METEOROLOGICAL MONITORING HISTORY (TOWER 2)

Elevation = 260 meters-msl State = Tennessee County = Roane Quad Map = Elverton (130 NW)

Latitude = 35° 53' 44" North Longitude = 84° 33' 56" West UTM Grid = 16 Northing (km) = 3975.31 Easting (km) = 736.28 Height Beginning Ending Data Type Instrument (meters) Date Date Wind Speed & Direction 10 05-11-1977 03-06-1978 Wind Speed & Direction 10 03-25-1982 11-04-1983

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 10 of 23 Appendix B (Page 5 of 5)

Site Facilities 4.0 METEOROLOGICAL MONITORING HISTORY (TOWER 3)

Elevation = 244 meters-msl State = Tennessee County = Roane Quad Map = Elverton (130 NW)

Latitude = 35° 53' 07" North Longitude = 84° 22' 33" West UTM Grid = 16 Northing (km) = 3974.21 Easting (km) = 736.88 Height Beginning Ending Data Type Instrument (meters) Date Date Wind Speed & Direction Vaisala 425 61 04-21-2011 current Wind Speed & Direction Vaisala 425 10 04-21-2011 current Wind Speed & Direction 110 03-24-1982 11-04-1983 Wind Speed & Direction 110 02-16-1977 03-06-1978 Wind Speed & Direction 61 03-24-1982 11-04-1983 Wind Speed & Direction 61 02-16-1977 03-06-1978 Wind Speed & Direction 10 03-24-1982 11-04-1983 Wind Speed & Direction 10 02-16-1977 03-06-1978 Dry-bulb Temperature 110 02-16-1977 03-06-1978 Dry-bulb Temperature 110 03-24-1982 11-04-1983 Dry-bulb Temperature Weed 101 (R. M. Young Shield) 61 04-21-2011 current Dry-bulb Temperature 61 02-16-1977 03-06-1978 Dry-bulb Temperature 61 03-24-1982 11-04-1983 Dry-bulb Temperature Weed 101 (R. M. Young Shield) 10 04-21-2011 current Dry-bulb Temperature 10 02-16-1977 03-06-1978 Dry-bulb Temperature 10 03-24-1982 11-04-1983 Dewpoint Temperature Viasala HMT-337 61 04-21-2011 current Dewpoint Temperature Viasala HMT-337 10 04-21-2011 current Dewpoint Temperature 10 02-16-1977 03-06-1978 Dewpoint Temperature 10 03-24-1982 11-04-1983 Solar Radiation Eppley 1 04-21-2011 current Solar Radiation 1 02-16-1977 03-06-1978 Solar Radiation 1 03-24-1982 11-04-1983 Rainfall (tipping bucket) Sutron 5600-420-1 1 04-21-2011 current Rainfall (weighing bucket) Belfort 5912-12 1 02-16-1977 03-06-1978 Rainfall (weighing bucket) Belfort 5912-12 1 03-24-1982 11-04-1983 Atmospheric Pressure Sostman 2010-28/32 HA-1 1 02-16-1977 03-06-1978

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 11 of 23 Appendix C (Page 1 of 13)

Meteorological Tower Wiring Diagrams IIC-1 EDS Site Layout IIC-2 Block Diagram IIC-3 Building Terminal Blocks (TB)

IIC-4 Patch Test Panel (PP)

IIC-5 Tower Base Junction Box (BP)

IIC-6 Tower 10m Panel (10m)

IIC-7 Tower 60m Panel (60m)

IIC-8 Eppley/Rain Gauge Panel (EP/RG)

IIC-9 Air Temperature Aspirator Panel (AP)

IIC-10 Dewpoint Aspirators Rear Panel (DP)

IIC-11 Ultrasonic Wind Sensor Rear Panel (WP)

IIC-12 Agilent Wiring List (AG)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 12 of 23 Appendix C (Page 2 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-1 EDS Site Layout

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 13 of 23 Appendix C (Page 3 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-2 Block Diagram

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 14 of 23 Appendix C (Page 4 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-3 Building Terminal Blocks (TB)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 15 of 23 Appendix C (Page 5 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-4 Patch Test Panel (PP)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 16 of 23 Appendix C (Page 6 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-5 Tower Base Junction Box (BP)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 17 of 23 Appendix C (Page 7 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-6 Tower 10m Panel (10m)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 18 of 23 Appendix C (Page 8 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-7 Tower 60m Panel (60m)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 19 of 23 Appendix C (Page 9 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-8 Eppley/Rain Gauge Panel (EP/RG)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 20 of 23 Appendix C (Page 10 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-9 Air Temperature Aspirator Panel (AP)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 21 of 23 Appendix C (Page 11 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-10 Dewpoint Aspirators Rear Panel (DP)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 22 of 23 Appendix C (Page 12 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-11 Ultrasonic Wind Sensor Rear Panel (WP)

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module II-c Rev. 0001 Manual METEOROLOGICAL MONITORING Page 23 of 23 Appendix C (Page 13 of 13)

Meteorological Tower Wiring Diagrams Figure IIC-12 Agilent Wiring List (AG)

EDS-CRN Clinch River Nuclear Plant Rev. 0001 Module III Page 1 of 3

<< Reserved for Future Use >>

Quality Related ; Yes No Environmental Data Station Manual Effective Date Level of Use: Reference Use Prepared by: Kenneth G. Wastrack (EMA), Meteorologist Reviewed by: < not applicable >

Date

< not applicable >

Concurred by:

Date

< not applicable >

Approved by:

Date

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module III Rev. 0001 Manual << Reserved for Future Use >> Page 2 of 3 Table of Contents 1.0 RESERVED FOR FUTURE USE............................................................................................... 3

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module III Rev. 0001 Manual << Reserved for Future Use >> Page 3 of 3 1.0 RESERVED FOR FUTURE USE

EDS-CRN Clinch River Nuclear Plant Rev. 0001 Module IV Page 1 of 6 STATION SCAN LISTS Quality Related ; Yes No Environmental Data Station Manual Effective Date Level of Use: Reference Use Prepared by: Kenneth G. Wastrack (EMA), Meteorologist Reviewed by:

Robert D. Stone (NPG), I&C Engineer, Computer Date Process Engineering Concurred by:

Jeffery N. Perry (P&O) Senior Project Manager, SMR Date Technology Approved by:

Walter H. Lee III (NPG), Manager, Emergency Date Preparedness--REMIC Chairman

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module IV Rev. 0001 Manual STATION SCAN LISTS Page 2 of 6 Revision Log Revision or Affected Change Effective Page Number Date Numbers Description of Revision/Change 0 All Pages Initial Release.

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module IV Rev. 0001 Manual STATION SCAN LISTS Page 3 of 6 Table of Contents 1.0 OVERVIEW................................................................................................................................ 4 2.0 EDS INTERFACE (EDS-TO-RAC) ............................................................................................ 4 3.0 SCAN LISTS - METEOROLOGICAL ........................................................................................ 5 3.1 Hourly Meteorological (Archive) ................................................................................................. 5 3.2 15-Minute Meteorological........................................................................................................... 6

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module IV Rev. 0001 Manual STATION SCAN LISTS Page 4 of 6 1.0 OVERVIEW The Clinch River Nuclear Plant (CRN) Environmental Data Station (EDS) computer encodes and formats meteorological data in real time as it is collected. The data are recorded to disk files and are periodically sent to an offsite computer. The station scan lists (section 3) provide the keys for interpreting the encoded data.

This module of the EDS Station Manual describes where the data is sent and what the data represent.

2.0 EDS INTERFACE (EDS-TO-RAC)

The Remote Access Computer (RAC) permits users to access data from Environmental Data Stations in near real-time, without accessing the EDS computers directly. The RAC is located in the Central Emergency Control Center (CECC) computer room.

For CRN, data files written to the RAC include:

• Hourly average meteorological data

• 15-minute average meteorological data Unlike the meteorological programs for other TVA nuclear plants, CRN is not on the TVA computer network. Therefore, a two-part process is used to communicate the data to the RAC.

A. Hourly and 15-minute observations, are copied to TVAs external FTP server (info.tva.gov). The FTP site maintains the data received from the EDS Computer.

B. The RAC obtains the data from the FTP server, posts it on the EDS website, and saves the data for later FTP access (for data validation).

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module IV Rev. 0001 Manual STATION SCAN LISTS Page 5 of 6 3.0 SCAN LISTS - METEOROLOGICAL 3.1 Hourly Meteorological (Archive)

Station: Clinch River Date:

Station Type: Meteorological - Hourly Program Installation Date:

Station Code: 9601 Program No.:

Scan Sheet ID: Previous Program No.:

Sample Printout

<SOH><ETX>*96,12,114,0300,D<ETX>

<SOH><ETX>1,@D24.07,=D26.82,)D287.04,>D5.23,ED5.80,@I35.05,=I39.25,)I285.35,>I2.34,EI2.95,@

Q34.56,=Q38.51,)Q285.77,>Q2.50,EQ3.12,FD43.24,FI43.05,GD30.26,GI32.09,HK0.00,JK0.00,KK28.94

<ETX><SOH><CR><LF><EOT>

Sample Actual Collection Instrument Code Data Decimal Description Units Frequency (Channel No.)

@D24.07 0 61M HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA 15 MIN. AVG.

=D26.82 0 61M HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA HRLY. AVG.

)D287.04 0 61M VECTOR WIND DIRECTION ° (azimuth) 5 SEC N/A

>D5.23 1 61M VECTOR WIND SPEED MPH 5 SEC N/A ED5.80 1 61M AVERAGE WIND SPEED MPH 5 SEC N/A

@I35.05 0 10M HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA 15 MIN. AVG.

=I39.25 0 10M HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA HRLY. AVG.

)I285.35 0 10M VECTOR WIND DIRECTION ° (azimuth) 5 SEC N/A

>I2.34 1 10M VECTOR WIND SPEED MPH 5 SEC N/A EI2.95 1 10M AVERAGE WIND SPEED MPH 5 SEC N/A

@Q34.56 0 TEST HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA 15 MIN. AVG.

=Q38.51 0 TEST HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA HRLY. AVG.

)Q287.77 0 TEST VECTOR WIND DIRECTION ° (azimuth) 5 SEC N/A

>Q2.50 1 TEST VECTOR WIND SPEED MPH 5 SEC N/A EQ3.12 1 TEST AVERAGE WIND SPEED MPH 5 SEC N/A FD43.24 2 61M AIR TEMPERATURE °F 5 SEC 102 FI43.05 2 10M AIR TEMPERATURE °F 5 SEC 103 GD30.26 2 61M DEW POINT °F 5 SEC 108 GI32.09 2 10M DEW POINT °F 5 SEC 105 HK0.00 2 1M SOLAR RADIATION GM-CAL/ 5 SEC 106 2

CM -MIN JK0.00 2 1M RAINFALL INCHES HOURLY 303 KK29.84 2 2M ATMOSPHERIC PRESSURE inchesHg 5 SEC 107

Environmental Clinch River Nuclear Plant EDS-CRN Data Station Module IV Rev. 0001 Manual STATION SCAN LISTS Page 6 of 6 3.2 15-Minute Meteorological Station: Clinch River Date:

Station Type: Meteorological Minute Program Installation Date:

Station Code: 9677 Program No.:

Scan Sheet ID: Previous Program No.:

Sample Printout

<SOH><ETX>*96,12,114,0245,D<ETX>

<SOH><ETX>77,:D284.69,:I270.68,:Q271.58,;D5.03,;I2.77,;Q3.06,ED5.50,EI3.07,EQ3.33,FD43.14,F I43.16,&D25.61,&I25.36,&Q23.09,JK0.00,KK28.94<ETX><SOH><CR><LF><EOT>

Sample Actual Collection Instrument Code Data Decimal Description Units Frequency (Channel No.)

D284.69 0 61M VECTOR WIND DIRECTION ° (azimuth) 5 SEC N/A

I270.68 0 10M VECTOR WIND DIRECTION ° (azimuth) 5 SEC N/A

Q271.58 0 TEST VECTOR WIND DIRECTION ° (azimuth) 5 SEC N/A

D5.03 1 61M VECTOR WIND SPEED MPH 5 SEC N/A

I2.77 1 10M VECTOR WIND SPEED MPH 5 SEC N/A

Q3.06 1 TEST VECTOR WIND SPEED MPH 5 SEC N/A ED5.50 1 61M AVERAGE WIND SPEED MPH 5 SEC N/A EI3.07 1 10M AVERAGE WIND SPEED MPH 5 SEC N/A EQ3.33 1 TEST AVERAGE WIND SPEED MPH 5 SEC N/A FD43.14 2 61M AIR TEMPERATURE °F 5 SEC 102 FI43.16 2 10M AIR TEMPERATURE °F 5 SEC 103

&D25.61 0 61M HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA 15 MIN.

&I25.36 0 10M HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA 15 MIN. AVG.

&Q23.09 0 TEST HORIZONTAL WIND DIRECTION ° (azimuth) 5 SEC N/A SIGMA-THETA 15 MIN. AVG.

JK0.00 2 1M RAINFALL INCHES 15 MIN 303 KK28.94 2 2M ATMOSPHERIC PRESSURE inchesHg 5 SEC 107