ML19340D312
| ML19340D312 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 12/23/1980 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0654, RTR-NUREG-654 NUDOCS 8012300261 | |
| Download: ML19340D312 (10) | |
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south CAROLINA ELECTRIC a GAS COMPANY PCST OrF;CE 9Cm 764 5 1 y
CcLUMBIA, SOUTH CARO LIN A 29218 s
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T. C. NicH C Ls. J R.
December 23, 1980 q
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Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.
S. Nuclear Regulatory Commission Washington, D. C.
20555
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 Upgraded Meteorological System
Dear Mr. Denton:
As requested by the NRC, South Carolina Elect'rfc and Gas Company, acting for itself and agent for South Carolina Public Service Authority, provides additional meteorological information regarding NUREG 0654, revision 1.
This information, which is given as a revision to FSAR section 2.3, will be included in the next amendment to the FSAR.
If you have any questions, please let us know.
Very truly yours, f
,y
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T. C. Nichols, Jr.
RBC:TCN:glb I
Enclosure cc:
V. C. Summer w/o enclosures G. M. Fischer w/o enclosures
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T. C. Nichols, Jr. w/o enclosures E. H. Crews, Jr.
O. W. Dixon, Jr.
D. A. Nauman O.
S.
Bradham W. A. Williams, J r.
A. A. Smith A.
R. Koon R. B. Clary J. B. Knotts, Jr.
J. L. Skolds B. A. Bursey NPCF/Whitaker File i
8012300 gi
ll The secondary measurements are necded only during periods of outage of the primary system.
It should be noted that the entire wind measurecent (wind speed and direction both) is replaced with secondary sensor data when either the primary wind speed or wind direction is invalid. -Since the 1975 data period had almost 100 percent recovery of the primary variables, no substitution of the secondary variables was used in the s
data analyses.
The final step in the data reduction program is the listing, in sequen-tial order, of the concurrent, hourly averaged values of the meteorolo-
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gical variables observed at the site.
A sequential listing of the hourly data for a full year constitutes the annual meteorological record of the site.
The annual record provides the input data for all types of ceteorological analyses nceded to define the site atmospheric dispersive-qualities.
2.3.3.2 Operational Program The operational ceteorological conitoring program for the Virgil C.
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Swrcer Nuclear Station will basically be a continuation of selected parameters'of the preoperational program.
The purposes of the opera-tional program are to provide:
1.
Meteorological data useful in the estimation of short term diffu--
sion characteristics to plant personnel on a timely basis.
2.
A data base of certain meteorological information for the assess-cent of plant operational impacts.
The equipment currently utilized in the preoperational program will be-used in the operational program.
However, the specific method of digital i
data recording (pulse tapes) presently used-may be replaced. -possibic
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2.3-30 AMENDMENT l-
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,o.M r.v 5 <. - r' S to the present digital l system include analog to digital.
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s ston, microprocessor averag/tng and/or direct otitput,of t2me aver-,
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\\' aged values to an in ;ilant data / reduc' tion c,ystem for case of m
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/t of information which may'be require'd on zi continuing op,erational basis. !
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1egardless of the digital recording sys/ tem, utilized,/the/ goals of a'ccu-l
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r racy and data recovery _per Rcgulatory_ Guide 1.23 (Febru/ary_,11,_1972 b }
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L'illbedaintained' Meteorological Site 2 (pole) equipment will be maintained and ope rated for a one yeat period af ter cc=erc!al station operation cermences to provide comparative (vs. Site 1 tower) data from which environmental heat dissipation system ef fects may be estimated.
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Parameters to be measured in the meteorological heat dissipation study ',,.//,,, m adia r w. u we m -~ m :
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are to include: A) Site 1: wind, speed, wind direction, di f ferential and ambient temperature and dewpoint B) Site 2: wind speed, wind direction, ambient tempe rature and dewpoint.
After the data base for assessing these effects has been acquired, the pole (Site 2) site will be deactivated along with those measurement systems at the tower site (Site 1) which are not utilized in the esti.
mation of diffusion characteristics.
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Parameters to be measured on a continuing basis for the operational estimatien of dif fusion characteristics on site include dif ferential 1
hower wind-speed 4 nd direce temperature, wind speed and wind direction.
z tion and 2 dif ferential1(10-61;O ntempe t'ature :ctr_ip-cha rt-recorders-willsbe.
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d.h ted-f rom-the-t owe r-e nc l os u re,.1'ower wind speed,and wind direction
%,.< <. do h - e h, and dif ferential (10-6111) tempe rature obse rvations will=be recorded on 13 strip charts on the main control board in the control room.
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2.3-30a M!END:' INT 13
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APRIL, 1979
INSERT A Ta;.a 2.0-357 1.Dt; :h2 digital systaa accuracies thus calculated for 5 and 15 minute averaging periods along with accuracy values presented in Regula-tory Guide 1.23, Revision 1.
Meteorological Site 2 (pole) aquipment will be maintained and operated for at least a one year period after commercial station operation commences to pro-vide comparative (vs. Site 1 tower) data from which environmental heat dissipation system effects may be estimated. During this period, the Site 2 system will provide backup of primary meteorological measurements by dis-patching, as needed, a technician to Site 2.
The near site =casurements may be transmitted via radio to accident assessment perscnnel in the Technical Support Center, Emergency Operating Facility, Control Room, etc.
Parameters to be measured in the meteorological heat dissipation study are to include: A) Site 1: wind, speed, wind direction, differential and ambient temperature and dewpoint B) Site 2: wind speed, wind direction, ambient temperature and dewpoint. After the data base for assessing these effects has been acquired, the pole (Site 2) site will be deactivated.
Parameters to be measured on a continuing basis for the operational estimation of diffusion characteristics on site include differential temperature, wind speed, wind direction, and precipitation. Primary meteorological system wind speed and wind direction and dif ferential (10-61M) temperature observations are redundantly recorded on strip charts on the main control board in the control room.
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The major hardware of the upgraded operational digital recording system consists of a rack mounted Monitor Labs System 9300 Datn Legger, necessary rignal en-version and conditioning, and a Techtran Model 950 Micro Disc (i.e., floppy disk) located in the Meteorological (Site 1) Shed which will interconnect to the Dose Assessment and Monitoring Systen (DAMS) located in the Control Building's Technical Support Center. Power for the measurement and digital recording' system is provided by a redundant power source.
The ML 9300 is configured for 20 analog input channels and is expandable to a maximum of 1040 input channels.
The ML 9300 is configured with the following hardware features:
20 analog input channels alphanuceric printer.
0 6-line/sec, 16 column alphanumeric printer.
Clock, DDD:HH:MM:SS, with battery take over in the event of power outage.
O High resolution digitizer (0.01%, 0.'10F or 0.1 C), 30,000 counts per voltage range.
0 4 voltage ranges: 1 3.000mV, 300.0mV, 3.0000V, 12.000V with auto ranging.
O Scaling: Digital spans and zero supression (Y=M+B) programmable by channel. This feature scales inputs to engineering units.
O Digital Averaging: Averaging interval 1,s selectable; per Channel enabling of averaging; invalid (ovverrange) data are excluded from average.
Program save memory: Permits storage of channel parameters with auto-matic restart on power up.
Data output interface to Techtran Model 950 Micro-Disc.
O Self-Test:
Self Diagnostics are executed through internal programs of the 9300. These programs allow checkout of the digitizer, 9300 CPU, EAROM, dynamic RAM, clock, keyboard, display and printer.
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The F1 9300 is interfaced to the 9 parameters presently being monitored by the Westinghouse Environmental Monitoring System at the primary Meteorological Site; namely, two levels of wind speed and direction (10.5 and 61.5 meters),
dewpoint (10 meter), ambient temperature (10 meter), two differential tempera-tures (10-61 meters and 10-40 meters) and precipitation.
Since wind direction parameters require two input channels each, a total of 11 F1 9300 input chan-nels ar-! utilized.
This leaves 9 spare input channels for later expansion.
Climatronics translator cards are provided to convert precipitation instrument pulses and delta temperature instrument tilliamps to the 0-5 volt range. This allows compatibility between all instrumentation signals and the F19300.
The ML 9300 is interfaced to a Techtran Model 950 Micro-Disc having 200,000 characters of storage capacity. This allows over 7 days of data storage (15 minute intervals) for the present configuration of 9 parameters. The Techtran 950 utilizes simple remote terminal protocol, i.e.,
simple ASCII character commands actuate the unit.
Surge protection against power surges for both the F19300 and the Techtran Model 950 Micro-Disc is provided.
The DAMS minicomputer system located in the control building's Technical Sup-port Center will be utilized to access data from the Techtran 950 Micro-Disc located about 1500 feet away at the meteorological shed via an RS232C serial interface. The DAMS minicomputer will be programmed to communicate with the Techtran 950 Micro-Disc either on demand or according to a pre-defined schedule (say, each 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />) to retrieve data for the period and store this data on a disk file for later reporting, averaging and utilization in estimation of doses due to both planned and unplanned radioactive releases. The DAM System is interfaced to the Westinghouse Computer in the TSC thus providing the capa-bility for remote interrogation by the licensee and/or other emergency response 3
organizations.
The meteorological inputs are digitized, converted to engineering units and averages into 15 (or 5) minute averages by the >1 9300.
fhese averages are then output to the Techtran Model 950 Micro-Disc for storage.
Each output record to the Model 950 is prefixed by the clock time (in days, hours, minutes, seconds) and system status (which will indicate whether a power failure oc-curred during the averaging period) followed by the parameter data.
Each parameter's data include number, sign and five digits for the data plus a de-cimal point, three alphanumeric characters for the engineering units and 3 digits indicating the number of samples included in the average. The average will be considered valid if at least 10 minutes (i.e., 60 scans) of data tere collected during a 15 minute averaging period. Normally, the Monitor Labs 9300 data logger calculates 15 minute averages using 89 ten second samples for all parameters with the exception of precipitation which is sampled once each 15 minutes.
(Note that there are 89 instead of 90 ten second samples collected each 15 minutes because one ten second sample is not collected due to the time required for the data logger to output 15 minute data to the Techtran 950 Micro-Disc.) The system may also be programmed for a 5 minute averaging period with a corresponding reduction in the total number of samples (scans) taken.
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The digital system accuracy according to the Proposed Revision 1 to Regula-tory Guide 1.23 (Onsite Meteorological Programs) and the Draft ANS-2.5 (Standard for Obtaining Meteorological Information at Nuclear Power Sites, dated May 23, 1979) is determined as follows.
"For individual samples all l
components from the sensors to the recording systems which contribute to measurement error are collectively defined by the Root Sum of the Squares 4
(RSS) method as the system accuracy. The RSS is calculated by squaring each error, summing the squared errors and taking the square root of the sum.
For time averaged values, those parts of the error budget which are truly random may be decreased from their instantaneous value by dividing by the square root of the number of samples used to define the average value.
Then the RSS calculation can be made."
The digital system accuracy is composed of errors contributed from the sensor, processor card and Monitor Labs System 9300 data logger. Two types of errors will be considered.
o Type 1: Absolute error-random.
Errors in this category are sensor and processor errors which include other " noise" sources.
Sensor and processor errors are generally assumed not to be in-dependent, in the absence of direct evidence of such independence.
O Type 2: Absolute error-Systematic.
Errors in this category are of the " calibration" type and are expected to be steady over each averaging period (i.e., 15 minutes). The digital data logger analog te digital converter errors are treated as Type 2.
Assume that Type 1 errors consist of (a) sensor errors and (b) processor (i.e., translator card) errors and that these are not independent.
Type 2 errors consist of (c) the analog to digital conversion performed by the data logger.
Then the digital system accuracy as defined by the RSS calculation is:
Digital System Accuracy (parameter, 15 minute average)
"g[(a + b)2/N + c2; for all parameters except precipitation N
number of samples = 89 For the precipitation parameter:
Digital System Accuracy (Precipitation, 15 minute sample) 7[(a+b)2+c 2
=
Type 1 errors are determined from instrument manufacturers' specifications.
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These errors are listed in Section 2.3.3.1.1 and Table 2.3-85.
In addition, Climatronicc Corporation translator cards with a maximum error of 0.5% are supplied to interface the differential temperature and precipitation para-meters to the data logger.
The Monitor Labs System 9300 (i.e., the data logger) has a Type 2 crror equal to 0.02% of Reading, ! 0.01% of Range, I 1 Count.
For purposes of this dis-cussion (and in order to present the worst case) the " Reading" will be the parameter full scale value (i.e., 5 volts); the " Range" will be the maximum 112.000 Volt range permitted; the "I 1 Count" will be equal to the digitizer resulution for this range (i.e., 12V : 1200 Counts = 0.00lV). The error due to the digital data logger analog to digital converter is computed by deter-mining the square root of the sum of the squares (i.e., the RSS) of the following error values:
1 0.02% Reading + t 0.0002
- 5V = I 0.00lv
! 0.01% Range = 1 0.001
- 12 = I 0.0012V I Count = 0.00lv The data logger error is, therefore, equal to 0.00185 Volts at the full scale reading of 5 Volts.
This may also be expressed as 0.0371% of full scale (i.e., either 5 Volts or corresponding engineering units). Note that the data logger digitizing error is conservative since all three parts of the er-ror were maximized and considered systematic and not random.
To illustrate the method of calculating the data logger error consider the vind speed parameter. The parameter range is 0 to 100 mph corresponding to i
0 to 5 Volts. The error due to the data logger is:
0.000371
- 100 mph = 0.0371 mph i
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TABLE 2.3-85F Meteorological Monitoring System Accuracies Di, ital Svstoms Digital System Pec. Citide 1. 23
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System Accuracy Accuracy (for Accuracy (for Parameter Design, Basis 15 minute period) 5 minute perloc A.
Wind Speed I.5 mph 1 0.122 mph i.20 8 mph B.
Wind Direction 15 degrees 10.669 degrees
!1.136 degrees-C.
Dew Point I 1.50C 10.04750C I 0.0639 C I
D.
Ambient Temperature i.50C 10.0475C f0.0639C E.
Differential Temperature I.150F 10.02300F f.0380F F.
Total Precipitation 10 I 0.0055 inch I.0055 inch 2.3-124f