ML18139B431

Forwards Functional Description of Upgraded Meteorological Facilities Required by NUREG-0654,App a & NUREG-0737,Item III.A.2.Sys Will Be Fully Operational,Pending Completion of NUREG-0696 Requirements

ML18139B431
Person / Time
Site:	Surry, North Anna
Issue date:	07/02/1981
From:	Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Harold Denton, Eisenhut D Office of Nuclear Reactor Regulation
References
RTR-NUREG-0654, RTR-NUREG-0696, RTR-NUREG-0737, RTR-NUREG-654, RTR-NUREG-696, RTR-NUREG-737, TASK-3.A.2.1, TASK-3.A.2.2, TASK-TM 405, NUDOCS 8107070159
Download: ML18139B431 (15)

Text

{{#Wiki_filter:VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND,, VIRGINIA 23261 July 2, 1981 R. IJ. LEA.SBUBO V:rc:,s PllBSJDENT NUCLJ:lAJ< 0P1:lRATIONS Mr. Harold R. Denton, Director Serial No. 405 Office of Nuclear Reactor Regulation NO/LEN:ms Attn: Mr. Darrell G. Eisenhut, Director Docket Nos. 50-280, 50-281 Division of Licensing 50-338, 50-339 U. S. Nuclear Regulatory Commission License Nos. DPR-32, DPR-37 Washington, D. C. 20555 NPF-4, NPF-7 Gentlemen: FUNCTIONAL DESCRIPTION OF THE UPGRADED METEOROLOGICAL FACILITIES NORTH ANNA AND SURRY POWER STATIONS Attached is Vepco's Functional Description of the Upgraded Meterological Facilities for North Anna and Surry Power Stations. This submittal is required by NUREG 0654 Appendix 2 and NUREG 0737 Item III.A.2. Because data obtained from the Meterological Facilities must input to the Emergency Response Facilities (NUREG 0696), Vepco's Meterological System will not be fully operable until the requirements of NUREG 0696 are complete. We are presently attempting to complete the required construction activities to have data available in the Control Room by August 1, 1981. However, our recent site activities have been dedicated to returning two units to service and this may delay the completion until August 21, 1981. If you have any questions or concerns, please contact us. Very tf~~/prs ,/1 .*

                                                                  /l!J fea,,-{ur R.H. Leasburg Vice President Nuclear Operations Attachment s1070701s9 aro7*02 -

PDR ADOCK 05000280 F PDR

e e VEPCO FUNCTIONAL DESCRIPTION OF THE UPGRADED METEOROLOGICAL FACILITIES PROVIDED TO MEET NUREG 0654 APPENDIX 2, "METEOROLOGICAL CRITERIA FOR EMERGENCY PREPAREDNESS AT OPERATING NUCLEAR POWER PLANTS" Introduction 10CFR Part 50.47 requires that each station's Emergency Plan shall provide "(A)dequate methods, systems, and equipment for assessing and monitoring actual or potential offsite consequences of a radiological emergency condition *** " In order to meet this requirement and in the interest of following the criteria set forth in tt.Jreg 0654 Appendix 2, the Vepco program for installing upgraded meteorological facilities at its nuclear stations was developed. The upgraded meteorological program utilizes a great deal of the equipment and software to be installed as part of the Vepco nuclear station's emergency response facilities. This equipment and software was described in greater detail in Vepco's recent submittal to the NRC, "Vepco Emergency Response Facilities, tt.Jreg-0696 Implementation Plan, Revision One: .l.Jne 1, 1981, Surry Power Station, North Anna Power Station." The basic functions provided by the Vepco upgraded meteorological program are:

1. A capability for making meteorological measurements.

2. A capability for making real-time predictions of the atmospheric effluent transport and diffusion.

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e e

3. A capability for remote interrogation of the atmospheric measurements and predictions by appropiate organizations.

Meteorological Measurements 10CFR Part 50 Appendix E requires that emergency facilities and equipment shall include "(E)quipment for determining the magnitude of and for continuously assessing the impact of the release of radioactive materials to the environment." In order to address this requirement, the Vepco nuclear stations will receive meteorological measurements from primary and backup systems. A primary meteorological measurements system is supplied for both operating nuclear sites. Proposed Revision 1 to Regulatory Guide 1.23 was used for guidance in designing the primary meteorological measurements system for the sites. North Anna Primary System The primary meteorological monitoring site at North Anna consists of a Rohn Model 80, guyed, 160-foot tower located approximately 1900 feet East of the Unit 1 reactor containment. Sensors are located at the lo-meter, 48-meter, and ground levels. Wind speed, wind direction, sigma (theta), ambient temperature, one-half of differential temperature, and dew point temperature are measured at the lo-meter elevation. Wind speed, wind direction, sigma (theta), and one-half of differential temperature are measured at the 48-meter elevation. Precipitation is monitored at the ground level. Signal cables are routed through conduit from each location W/4669/2

e into the instrument shelter at the base of the tower. Inside the shelter, the signals are. routed to the appropriate signal-conditioning equipment whose outputs go to: 1) strip chart recorders; 2) digital data recorders; and 3) an interface with the intelligent remote multiplex system. Table 1 shows a detailed list of the sensors installed on the North Anna primary meteorological tower. Surry Primary System The primary meteorological monitoring at Surry site consists of a Rohn Model 90, guyed, 150-foot tower located approximately 4500 feet southeast of the Unit 1 reactor containment. Sensors are located at the 10-meter, 45-meter, and ground levels. Wind speed, wind direction, sigma (theta), ambient temperature (which is also one-half of differential temperature), and dew point temperature are measured at the lo-meter elevation. Wind speed, wind direction, sigma (theta), and one-half of differential temperature are measured at the 45-meter elevation. Precipitation is monitored at the ground level. Signal cables are routed through conduit from each location into the instrument shelter at the base of the tower. Inside the shelter, the signals are routed to the appropriate signal-conditioning equipment whose outputs go to: 1) strip chart recorders; 2) digital data recorders and 3) an interface with the intelligent remote multiplexer system. Table 2 shows a detailed list of the sensors installed on the Surry primary meteorological tower. W/4669/3

e e A backup meteorological measurements system is supplied also for both operating nuclear sites. Again, proposed Revision 1 to Regulatory Guide 1.23 was used for guidance in designing the backup meteorological measurements system for both sites. North Anna Backup System The North Anna backup meteorological monitoring site consists of a Rohn Model 25, free-standing, lo-meter tower. This tower is located approximately 1300 feet Northeast of the Unit 1 reactor containment and serves as the back-up meteorological monitoring site. A sensor at the top of the mast monitors wind speed, wind direction, and sigma (theta). The signal path, instrument shelter and data recording are identical to those described at the primary tower. All three parameters are interfaced to the intelligent remote multiplexing system equipment. Table 1 shows a detailed list of the sensors installed on the North Anna backup meteorological tower. SUrry Backup System The Surry backup meteorological monitoring site consists of a Rohn Model 25, free-standing, IO-meter tower. This tower is located approximately 3000 feet east-southeast of the Unit 1 reactor containment and serves as the back-up meteorological monitoring site. A sensor at the top of the mast monitors wind speed, wind direction, and sigma (theta). The signal cables are run through conduit into an equipment shelter at the site. The signals are routed to signal-conditioning equipment, and the resulting signals are fed to: 1) strip chart recorders; 2) digital data recording equipment; and 3) an interface with the intelligent remote multiplexing system. W/4669/4

e e Table 2 shows a detailed list of the sensors installed on the' Surry backup meteorological tower. All data from both site's primary and backup meteorological towers is sent to the station's control rooms as 4-20ma current signals over individual shielded pair cables. Once there, all parameters are collected by the Nureg 0696 Emergency Response Facility (ERF) data system via the intelligent remote multiplex system. Each station's ERF data system is functionally redundant and meets the overall 99% availability requirement in f\lJreg 0696. *(Seethe June 1, 1981 Vepco submittal on Nureg 0696 Emergency Response Facilities for further information). Once collected by the multiplex system, these parameters are placed in the ERF data base thus making all the site meteorological field data available for display in the station's Technical Support Center (TSC) or the Vepco central office Emergency Operations Facility (EDF). Certain input sensor information in the control rooms are also hardwired for display on the main control room meteorological panels. Tables 3 and 4 list each meteorological input parameter and its transmitted location. Atmospheric Transport and Diffusion Assessment A near real-time, site specific atmospheric transport and diffusion model for assessing accidental airborne radioactive releases will be available for use upon installation and operation of t'l.lreg 0696 Emergency Response Facility data communications processor hardware and software on the schedule as presented in "Vepco Emergency Response Facilities, NUREG-0696 Implementation Plan, Revision one: June 1, 1981, Surry Power Station, North Anna Power Station, Virginia Electric and Power Company." ~ --~ ~ W/4669/5

e e Development of the Class A model will consider Nuclear Regulatory Commission guidance information, expected to be available by October, 1981, for reactor licensees concerning the meteorological elements to be considered in the development of an emergency plan and in the application of the Class A model for varying terrain environments. Development of the Class B model will depend upon the Nuclear Regulatory Commission's reappraisal of Class B capability. The Class A model will use actual 15 minute average meteorological field data obtained from the station's meteorological system as discussed in the previous section. The Class A model will provide relative concentrations (X/Q) and transit times within the plume exposure EPZ. Atmospheric diffusion rates will be based on atmospheric stability as a function of site-specific conditions. Source characteristics (release mode, and building complex influence) will be factored into the model. The output from the Class A model will include plume dimensions and position, and the location, magnitude, and arrival time of (1) the peak relative concentration and (2) the relative concentrations at approximate locations. The calculated output of the Class A model will be placed in each operating site's ERF data base for display in the station's TSC and in the central office EDF. The exact parameters to be calculated and provided to each station's ERF data base will be determined following receipt of additional guidance on the Class A model from the NRC. W/4669/6

e Remote Interrogation In order to meet the requirement in 10CFR Part 50 that "(P)rovisions for communications by the licensee with the NRC Headquarters and the appropriate

• NRC Regional Office Operations Center from the nuclear power reactor control room, the onsite technical support center, and the near-site emergency operations facility" and " *** among the nuclear facility, the principle state and local emergency operations centers *** ", each operating nuclear site's ERF data system will have the capability of being remotely interrogated.

As previously mentioned, the field input meteorological data as well as the Class A model output data will be available in each station's ERF data base. Therefore, any or all of this data can be made available for remote interrogation. Any knowledgable party with an acceptable terminal* and modem will be capable of dialing into the applicable computer port in each station's ERF system and upon passing a security check will receive printouts of the required data. Two dedicated ports (one primary, one backup) will be provided for the NRC's use with additional ports provided for state and local emergency operations centers as necessary. The formats of the reports will be determined in the future using Regulatory Guide 1.23 (final version) as guidance. Documentation for procedures to access and use the remote interrogation subsystem will be provided to the emergency response organizations that require them and the NRC and will be available in each station's control room and TSC as well as the Vepco central office EDF.

 *An acceptable terminal is an 1200 baud 80 column ASCII terminal with a RS-232-C interface.

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TABLE*l NORTH ANNA METEOROLOGICAL SYSTEM SENSORS MANUFACTURER MODEL NUMBER PARAMETER MEASUREMENT METHOD ACCURACY Meteorology! 1074-22 1) Wind speed 1) Light Chopper (variable .:t.0-25 mph Research, Inc. frequency) Frequency to voltage .:!:_0.25 mph circuit card

2) Wind Direction 2)a) 0-540 Potentiometer +2.5° (strip chart recording and telemetry)

Resistance to voltage circuit card b) sine/cosine potentiometer (digital recording) Dual buffer amplifier +1.6° card

3) Sigma (theta) 3) Sigma azimuth amplifier Linearity= .:!:_0.5%

circuit card (input F .S., from 540 output) Stability= .:t.2% F.S. Root Sum of Squares (RSS) = +0.35 mph, +2.9% (540), +3.90 (sine/cosine), +0.90 sigma Rosemount, Inc. 104-ABG-l Sensor, upper 1/2 Platinum +O.l30F Delta T RTD 104-ABG-2 Sensor, lower 1/2 Platinum +0.130F Delta T, RTD e Sensor, Ambient T Platinum RTD +0.130F 442 ARDA Delta T Resistance to maDC +0.1% = 0.0250F Transmitter circuit 442 ARPA Ambient T R~sistance to maDC +0.1% = +o.1a°F transmitter circuit RSS = +0.1B6°F Delta T (+o.103oc), +o.220F Ambient (+o.12oc) lMRl 1074-22 sensors are used at all three locations (48-meter and IO-meter primary tower elevations and IO-meter backup tower elevation)

TABLE 1 (can't) MANUFACTURER MODEL NUMBER PARAMETER MEASUREMENT METI-OD ACCURACY EG&G 110 Dew Point Chilled mirror maintained +Q.SOF Temperature at dew point temperature Meteorology 302 Raingauge with Tipping bucket +1% at 3"/hr Research, Inc. heater +5% at 10"/hr

TABLE 2 SURRY METEOROLOGICAL SYSTEM SENSORS MANUFACT~ER MODEL NUMBER PARAMETER MEASUREMENT METI-OD ACCURACY Belfort Instrument 5-405 Rainfall Tipping bucket +1% at l"/hr. Company +4% at 3"/hr

                                                                                                +6% at 6"/hr EG & G                110           Dew point               Chilled mirror maintained   +0.50F temperature            at dew point temperature Meteorology         1074-22      1) Wind Speed         1) Light chopper (variable       +0.25 mph Research, Inc.                                              frequency)

Frequency to voltage +0.25 mph circuit card Root sum of squares (RSS) = .:t_0.35 mph

2) Wind Direction 2)a) 0-540 potentiometer +2.50 (strip chart recording and telemetry)

Resistance to voltage +1.40 circuit card RSS = b) Sine/cosine potentiometer (digital recording) Dual buffer amplifier +1.60 circuit card

3) Sigma (theta)l RSS =

3) Sigma azimuth amplifier Linearity= +0.5%

e-- circuit card (input from F.S = +0.2250 540 output) Stability=

                                                                                                +2% F.S. = +Q.90 RSS =    +0.90 lTo be added to primary tower.

TABLE 2 (can't) MANUFACTURER MODEL NUMBER PARAMETER MEASUREMENT METI-OD ACCURACY Rosemount, Inc. 104mb 12 ADCA Temperature Platinum RTD Sensors 2 Endevco 4473.2 RTD Signal Resistance to millivolt +0.120F {T) Conditioner conversion +o.0120F (Delta T) RSS (Ambient T) = +0.180F RSS (Delta T) = +0.180F 210-meter sensor is for Ambient T and one-half Delta T W/4669/11

e TABLE 3 PRIMARY TOWER PARAMETERS Transmitted Locations ERF control Remote Database Room Interrogation

1. Wind Direction (Upper) X X X

2. Wind Speed (Upper) X X X

3. Sigma Theta (Upper) X X

4. Wind Direction (Lower) X X X

s. Wind Speed (Lower) X X X

6. Sigma Theta (Lower) X X

7. Ambient Temperature (Lower) X X X

9. Dewpoint Temperature (Lower) X X

9. Delta Ambient Temperature X X X (Upper-Lower)

10. Precipitation X X

11. Solar Radiation (l'brth Anna only) X X Notes:

1) Table applies to both North Anna and Surry

2) All parameters going to the ERF database will be available for printout in the TSC and EOF. The control room parameters are hardwired.

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                       **              TABLE 3 PRIMARY TOWER PARAMETERS Transmitted Locations ERF        Control       Remote Database       Room      Interrogation

1. Wind Direction (Upper) X X X

2. Wind Speed (Upper) X X X

3. Sigma Theta (Upper) X X

4. Ambient Temperature (Upper, Calculated) X X

5. Wind Direction (Lower) X X X

6. Wind Speed (Lower) X X X

7. Sigma Theta (Lower) X X

8. Ambient Temperature (Lower) X X X

9. Dewpoint Temperature (Lower) X X

10. Delta Ambient Temperature X X X (Upper-Lower)

11. Precipitation X X Notes:

1) Table applies to both North Anna and Surry

2) All parameters going to the ERF database will be available for printout in the TSC and EDF. The control room parameters are hardwired.

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i

• I*~*
• TABLE 4.

BACKUP TOWER PARAMETERS Transmitted Locations ERF Control Remote Database Room Interrogation

1. Wind Direction X X X

2. Wind Speed X X X

3. Sigma Theta X X X Notes:

1) Table applies to both North Anna and Surry

2) All parameters going to the ERF database will be available for printout in the TSC and EDF. The control room parameters are hardwired.

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