ML20039E134
| ML20039E134 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 12/29/1981 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0654, RTR-NUREG-0737, RTR-NUREG-654, RTR-NUREG-737, TASK-3.A.2.2, TASK-TM TAC-46331, TAC-46332, NUDOCS 8201060568 | |
| Download: ML20039E134 (8) | |
Text
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1 I%SCOnSin Electnc roara coupasr 231 W. MICHIGAN, P.O. BOX 2046, MILWAUKEE, WI 53201 December 29, 1981 141 p
Mr. H. R. Denton, Director RECEtVED Office of Nuclear Reactor Regi11ation 2
JAN 5 1982> 73 U. S. NUCLEAR REGULATORY COMMISSION g-Washington, D.
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Attention:
Mr. R. A. Clark, Chief Operating Reactcr Branch 3
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Gentlemen:
DOCKET NOS. 50-266 AND 50-301 FUNCTIONAL DESCRIPTION AND PROPOSED IMPLEMENTATION SCHEDULE - METEORLOGICAL MONITORING SYSTEM POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 In accordance with Appendix 2 to NUREG-0654, Revision 1; NUREG-0737,Section III.A.2; and our letters dated January 9, July 17, and September 14, 1981, we are providing the attached functional description and proposed implementation schedule for the meteorological monitoring system at Point Beach Nuclear Plant.
The referenced letters provided general information about the proposed meteorological monitoring system and proposed implementation schedule.
The attached completes our submittal as required by Milestone 3 of Appendix 2 to NUREG-0654, Revision 1.
Please contact us if you have any further questions regarding this submittal.
Very truly yours,
[ky' c
C. W.
Fay, Director Nuclear Power Department Attachment i
Copy to NRC Resident Inspector 0
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EMERGENC'I PREPAREDNESS - METEOROLOGICAL SYSTEM In accordance with NRC requirements concerning emergency preparedness at operating nuclear power plants as specified in 10 CFR Part 50.47, Wisconsin. Electric Power Company hereby provides.a functional description of the upgraded program and a schedule for installation and full operational capability of.
the meteorological measurement system.
The system includes the J[-
capability for making near real-time predictions of atmospheric effluent transport and diffusion, a dose calculational methodology, and the capability for remote interrogation.
These plans address the essential elements and guidelines set forth in Appendix 2 to Revision 1 of NUREG-0654 and proposed Revision 1 to Regulatory Guide 1.23 dated September 30, 1980.
A.
Representativeness of the Current (Primary) Meteorological-J-
Tower Location 3
Thb current 150-foot meteorological tower is located 2,700 feet south of the plant and.about 150 feet west of_ the Lake Michigan shoreline.
The current tower location has been reviewed and verified to be representative of plant release conditions.
Contrary to our January'9, 1981 letter, after discussions with NRC Staff, we understand that the primary tower should be located at points repre-sentative of plant release conditions.
The grade of the tower location is approximately the same as the plant and the top of the tower is approximately the same as effluent release height.
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B.
Upgrading of Primary Tower Measurements Program The specifications, parameters, and location of measurement
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of those parameters were described in'the January 9, 1981 letter from 'Mr. C. W. Fay to Mr. H. R. Denton.
We have, however, revised the specifications for sigma-theta measure-ment data acquisition and power cupply.
To meet the
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compensating actions for Milestone 3 of Appendix 2 to
.NUREG-0654,-Revision 1, the following equipment will be installed.
Sigma-thata will be measured at the ten-meter level.
The primary and backup tower data acquisition system will generate?an analog signal converted to digital form and-transmitted to digital to analog converters.
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These converters will drive analog strip chart recorders.
i These recorders will be visible in the control room'from the shift supervisor's position.
The signal conditioner and digital signal. transmitter at each tower site will be contained in an environmentally controlled housing to o
ensure satisfactory comoonent performance.
The meteorological
. tower and environmentally controlled housing.will be supplied with a: single power supply.
The power supply to the backup / tower-and data acquisition system will originate from a bus unrelated to the electrical bus for the primary.
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tower power supply.
This will ensure in-plant availability of the basic parameters: wind speed, wind direction, and stability class indication.
This same equipment will form the data acquisition system that will constitute the data base for the Class A model required in Milestones 4 and 5 of Appendix 2 to NUREG-0654, Revision 1.
C.
Backup Meteorological Measurements Program We have investigated the feasibility of coordinating meteorological measurement efforts with Wisconsin Public Service Corporation which operates the Kewaunee Nuclear Power Plant located approximately four miles north of Point Beach Nuclear Plant.
The use of Kewaunee Nuclear Power Plant meteorological system as a backup to the primary system at Point Beach Nuclear Plant is not feasible.
We will therefore install a guyed ten-meter tower approximately the same distance west of the Lake Michigan shoreline as the containment buildings and approximately 1,000 feet north of the plant.
The remainder of the specifications for this backup to the primary tower conforms to those described in our January 9 letter.
The backup equipment will supply data for the Class A model and meets the compensating action requirements in Milestone 3 if the primary meteorological system fails.
D.
Plant Control Room Data Availability Provisions are being made for analog display and recording of all parameters measured on the primary and backup meteorological towers.
When full operability of the plant computer system and the associated meteorological software is achieved, the data will be available and recorded in digital form.
The analog display and recording system will then be used as a, backup.
This data availability _
applies as well to any supplementary lake effects tower (s) that may be installed.
E.
Lake Effects Instrumentation We have evaluated the need for an inland ten-meter tower to characterize the spatial variability of the wind field, especially during lake breeze situations.
The parameters measured at the inland tower.will include wind speed, wind direction, and sigma-theta (stability class determination).
Since our January 9, 1981 letter, we have met with the NRC Staff and have mutually concluded that a secondary ten-meter tower at or near the lakeshore is not necessary.
Any decision to install additional inland towers to further characterize lake breeze effects will be contingent on 'the findings of a National Oceanographic and Atmospheric i
Administration (NOAA) study on lake efferts.
This study
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will be conducted in the vicinity of Point Beach Nuclear Plant during the summer of 1982..
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F.
Real-Time Prediction of Atmospheric Effluent Transport and Diffusion and Remote Interrogation Capabilitie.s Meteorological data will be available to the NRC and Wisconsin Division of Emergency Government th. rough telephone access to the Point Beach Nuclear Plant.
A telephone number will be provided at which the person responsible for the calculation of the off-site dose projections may be reached.
G.
Implementation Schedule for Meteorological Emergency Response Plan The majority of the compensating actions to Milestone 3 required by Appendix 2 of Revision 1 to NUREG-0654 were implemented prior to April 1, 1981.
The communications system (NAWAS) with the nearest National Weather Service station (Green Bay, Wisconsin) is checked on a monthly basis. We take exception to the requirement for quarterly calibration of meteorological instrumentation, since we presently calibrate meteorological instrumentation on an annual basis and have found adjustments required only on rare occasion.
These parts together with a consideration of the hazards involved in personnel access during the winter lead us to the conclusions that annual calibration is both ample and prudent.
The United States Coast Guard Station in Two Rivers, Wisconsin, and Kewaunee Nuclear Power Plant are two sources to which we have access during any outages of the Point Beach meteorological measurement system.
The meteorological readouts in the control room are presently part of an inspection record kept by the operations personnel on a daily basis.
These operations records are reviewed on a quarterly basis to assure that the meteorological data unavailability does not exceed the limits outlined in proposed Revision 1 to Regulatory Guide 1.23 dated September 1980.
The Dose Calculational Method (DCM) in our Emergency Plan Implementing Procedures consists of a X/Q overlay system for combinations of wind speed, wind direction, and atmospheric stability covering areas out to ten miles from the plant.
The dispersion model algorithms used to calculate the dilution factors are consistent with the criteria in Regulatory Guide 1.145.
The algorithm development to address site-specific lake breeze and stable on-shore flow situations is awaiting the completion of the NOAA study mentioned in Section E above.
If feasible, this algorithm will be incorporated into the DCM as soon as it is available.
The lake breeze algorithms will be incorporated into the Class A model software package for the plant computer system..
-s The compensating actions for Milestone 3, including' meeting the instrumentation specifications required by proposed Revision 1 to Regulatory Guide 1.23 dated September 1980, are expected to be operational by July 1, 1982. The interim system will include the primary tower described in Section B above and the backup tower in Section C above.
The recording equipment will consist of analog chart recorders for all.
parameters measured.
Wind speed and wind direction parameters are also available on analog meters located on the control room par.el. The telemetry system from the primary and backup towers to the. recording and readout equipment will include signal conditioners and analog to digital converter-transmitters at the_ tower sites, RS232 cable to the plant, and digital to analog converter-receivers in the plant.
The analog strip chart recorders will be of the three pen type for the wind speed and wind direction parameters.
All other parameters will be recorded on multipoint recorders with the exception of sigma-theta for the backup. tower.
Sigma-theta for the backup. tower will be recorded on its own single pen recorder to ensut- 'he availability of that parameter if the primary tower multipoint recorder fails.
Power supp?ies to control room instrumentation for the primary and backup tower recorders will be separated such that failure of one will not result in the failure of the other.
The location and installation of any inland tower (s) will.
be contingent upon the NOAA study results referenced in Section 3 and are therefore delayed.
Determination of the
-site (s) for the inland tower (s) is expected to occur in 1983.
Early discussions with the National Weather Service during an emergency situation will compensate for the inland tower installation delay by providing the information necessary to account for lake effects and/or stable on-shore flow.
The National Weather Service (NWS) has a 24-hour teletype contact with the U. S. Coast Guard station in Two Rivers to help in categorizing t:1e' atmospheric diffusion characteristics in the area of Point Beach.
Selection of data sampling times and data averaging times for computer recording will be mcde during 1982 as part of the development of the software package.
These sampling and averaging times will be supplied when available and will comply with the minimum NRC requirements.
H.
Emergency Response Facility Meteorology Hardware and Software (Milestone 4)
The Control Room, the Technical Support Center, and the Emergency Support Center will have the hardware necessary to provide access to any. meteorological information available.
This hardware will be installed at the same time as the computer system in the plant (see Section I).
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I.
Full Operation of Meteorological Hardware and Software ~
(Milestone 5)
I The software-based DCM and Class A model will be available for use in the Control Room, Technical Support Center, and Emergency Support Center by approximately January 1, 1984.
The Class A model will address all those items set down in Appendix 2 to NUREG-0654, Revision 1, including site-specific-algorithms addressing lake breeze and stable on-shore flow situations.
J.
Class A Model Description The atmospheric diffusion models and instructions for their use in predicting the consequences of accident releases to be used in this Class A model are contained in NRC Regulatory Guide 1.145 (August 1979).
This Regulatory Guide recommends the use of a Gaussian plume-model to calculate relative concentrations (X/Q) at specified downwind distances and for specific time periods, release heights, locations, and stability conditions. However, because Point Beach Nuclear Plant is located in.a lakeshore environment, the Class A model will also account for the occurrence of lake-induced fumigation conditions. NUREG/CR-0936 (October 1979) describes various meteorological measurement programs and atmospheric diffusion prediction methods-for use at coastal nuclear reactor sites.
This document will be used as a guide in addressing the occurrence of lake-induced.
fumigation conditions.
However, in lieu of the specific guidance contained therein, the equation developed by Weisman and Hirt (1975) to calculate TIBL heights and the revised regional shoreline fumigation model (GLUMP.II) developed by Lyons (1981) will be considered for incorporation into the Class A model to account for the effects of lake-induced fumigation on Point Beach emissions.
During the spring'and summer of 1982, NOAA will'be conducting a study of lake-induced fumigation conditions-near Point' Beach Nuclear Plant.
The data from this study will also be used to develop an algorithm which will provide.a conservative' estimate of onshore penetration and ultimate trajectory of the stable air mass.
I.
Software Requirements For Class A Model A meteorological'and dose calculation program will be developed to perform atmospheric dispersion and radiological dose assessments using site-specific information.for Point Beach.
The program will be capable of assessing meteorological parameters and radiological consequences during' accident conditions to' meet NUREG-0654, Revision 1, Appendix 2 requirements.
To. accomplish these functions, the overall system will have real time meteorological data' acquisition and processing, editing and averaging, data transmission, and storage in the in-plant computer system.
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The real time' data processing component of the meteorological and dose calculation system will consist of programs which retrieve data (from in-plant computer)and edit, average, and transmit valid averaged meteorological data back to the in-plaat computer.
Editing will include limit checking for all Iertinent meteorological parameters, calculation of precipitation amounts, and possibly re-formatting of the data.
Valid wind speed, wind direction, atmospheric stability. precipitation, and reference temperature data will be averaged and stored on separate files in the in-plant computer.
A user-initiated' program will perform a more detailed validation of input data (e.g., trend checks, change in wind speed with height,_etc.) prior to use in atmospheric dispersion and dose calculation programs.
The accident release program will allow the user to calculate off-site doses to the whole body and thyroid due to submersion in a semi-infinite cloud.
Included in the required user input for program execution are effluent isotopes, time of release, and effluent flow rates.
The model will also have the capability to predict atmospheric relative concentrations (X/Q) and radiological doses as a function of downwind distance using as input measured concentrations obtained at various downwind distances along the plume centerline.
Upon execution, the accident release program will obtain from data storage the appropriate validated averaged meteorological data and computer accident X/Q values based on the Class A atmospheric dispersion model for compliance with NUREG-0654, Revision 1, Appendix 2.
Applicable plant operating information will be supplied by the user at the time of execution.
The X/Q values will be calculated at a number of preselected locations for each of the nine relevant compass directions.
The results of the accident X/Q calculations will be stored for use by an accident dose calculation program.
The basic parameters of wind speed, wind direction, stability class, and X/Q and calculated doses will be output on CRT and/or hardcopy.
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