ML20148S139

Forwards Meteorological Data Comparison of Old & New Towers Located at Subj Facil.Comparison Completed in Order to Comply W/Amend 48,of FSAR

ML20148S139
Person / Time
Site:	North Anna
Issue date:	11/28/1978
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Harold Denton, Parr O Office of Nuclear Reactor Regulation
References
NUDOCS 7812010255
Download: ML20148S139 (18)

Text

,

e, Y1]IGINTA E LECTilIC AND POWElt C OMPANY H ICIIM O N D, VI H OI N T A o G o 61 November 28, 1978 lir, Harold R. Denton, Di rector Serial flo.

645 Office of fluclear Reactor Regulation ES/FBM: yro Attn:

Mr. O. D. Parr, Chief Light Water Reactors Branch ilo. 3 Docket Nos.

50-338 Division of Project Management 50-339 U. S. Nuclear Regulatory Commission 50-404 Washington, DC 20555 50-405

Dear Mr. Denton:

Attached is the meteorological data comparison of the old and new meteorological towers located at Vepco's North Anna Nuclear Power Station.

This comparison was completed in order to comply with Amendment 48, Section 2.3 paragraph 2.3.3.2.1, of the llorth Anna FSAR.

Very truly yours,

[

Sam C. Brown, Jr.

Vice President-Power tation Engineering and Construction Attachment

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l NORTH ANNA METEOROLOGICAL DATA COMPARISON OLD TOWER (ORIGINAL) VS. NEW TOWER i

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Virginia Electric and Power Company has completeu a study at the North Anna Nuclear Power Station comparing meteorological data from the old tower site with data from the new tower site. Due to the construction of a parking lot in the area surrounding the old tower, it was necessary to relocate the entire tower system. A new tower with all new meteorological instrumentation was installed approximately 1000 feet due east of the old tower (see Attachment 1).

Distances and bearings to significant ground features are shown on Attachment 2.

This comparison was completed to fulfill the obligation and intent expressed in Amendment 48, Section 2.3, paragraph 2.3.3 2.1 of the North Anna FSAR. We find the meteorological data collected from the new tower site to be completely representative of the data collected at the old tower site, and duplicates the dispersion characteristics of the North Anna Nuclear Power Station as were originally characterized using old tower data. Furthermore, the main dispersion parameters, wind flow and wind persistence, are practically identical.

The new tower system became operational effective April 1, 1977, about 5 months later than the predicted operation date. The 9 months of ope ra t i on in 1977 was chosen to be representative of the concurrent year data f rom the new towe r system. Un for t una t el y, its concurrent year counterpart, the old tower system, had numerous outages and equipment failures in 1977 This should have been anticipated, considering the age of the instrumentation and logistics problems in keeping two separate meteorological systems in full operation at one time.

It was felt that keeping the new more accurate meteorological system fully operational should receive higher maintenance priority than the outdated equipment of the existing tower. We felt i

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9 instrumentation replacement. should not be necessary, since the sensitivity and accuracy of the newer instrumentation would result in a collection of data not completely representative of the data collected by the older instrumentation of the old system.

Fu r the rmo re, the existence of a parking lot around the old tower in 1977 would have made a negative impact on any comparisons with the new taver site or any comparisons from previous years data at the same old tower site. The costs of purchasing new instrumentation for only a short usage period were also prohibitive and not necessary as we explain below.

It is felt that even though concurrent years could not be compared as planned, we can show that the new meteorological tower system falls within the expected meteorological variability of the collected parameters as shown in earlier years data collection at the old tower.

Old tower data set years 1974, 1975, and 1976 were compared wi th 1977 new tower data.

The meteorological variables of significance which were compared were annual wind roses, wind persistence, s tabili ty class frequency, wind speed f requency, diurnal curves of temperature, dew point spread, and del ta T.

A comparison of these primary meteorological variables with their overriding importance to site dispersion characteristics should be sufficient to show the common diffusion characteristics of both tower locations. The following shows startup dates for both old and new tower systems.

April 1,1974 - old tower became operational (no Jan-March data)

April 1,1977 - new tower became operational (no Jan-March data)

The following are discussions of each primary meteorological variable.

WIND ROSES The frequency distribution by direction sector for old tower 1974, 1975, and 1976, and new tower 1977 are given in Attachment 3 The distributions for all 4 years are very similar. The highest f requencies occurred in the S-SSW and WNW-N sectors.

Lowest frequencies occurred in the NNE-ESE sectors. The variabili ty among years is as expected wi th no perceptible di f ferences between old and new tower years.

WIND DIRECTION PERSISTENCE Wind di rection persistence data for old tower 1974,1975, and 1976, and new tower 1977 are given in Attachments 4 and 5 is a graph of the cumulative probabili ty of wind persistence occurrence for the four years of data. Attachment 5 gives a more speci fic interpretation of the curves in Attachment 4 and the maximem persistence in each year.

Data for all four years are extremely close on a comparative basis.

STABit P v CLASS FREQUENCY The frequency of occurrence of each stabili ty class A-G determined by delta T measurements is shown in Attachment 6 for the four comparison yea rs.

Data years 1977,1976, and 1975 show cons is ten t frequency relationships for the seven stabili ty classes.

1974 data does not seem to fit the data of the other years, especially its abnormally high f requency of occurrence in the A stability category. Attachment 11 which will be detailed later, does show consistently more negative values for delta T for the year 1974. The higher occurrences of neostive delta T may be partially explained by the diurnal teiperature curves of Attachment 8.

1974 has higher temperature values than any of the other years. The difference in temperature is not as great as indicated though due to missing Jan-March data.

It is very probable that the high A class f requency is due to a combination of natural delta T variation and some blasing in our data base due to the missing data.

WIND SPEED FREQUENCY In At tachment 7, wind speed frequency by class is given for the four years of data. The four years of data is markedly similar on a class by class comparati ve basis. The 4-7 mph class is consistently the class of highest f requency, which further illustrates the four years data compatability.

I 4

AMBIENT TEMPERATURE shows the diurnal curves of ambient tempe rature for the four years of data comparison. As indicated previously, the months Jan.-March are missing in the 1974 and 1977 data sets. Therefore, the higher curves for 1974 and 1977 data are biased upward due to the missing data.

Otherwise the diurnal curve shape and magnitude among years is very similar, with slight variations as expected due to yearly temperature differences.

DEV P0lHT TEMPERATURE shows the diurnal curves of dew point temperature for the four years of data comparison. As with ambient tempe rature, dew point curves of 1974 and 1977 are artifically high due to the missing Jan.-March data.

The magnitude variation between 1975 and 1976 data is quickly apparent.

Year to year variability is the reason for this.

Yet even with the magnitude variations, the curve shapes are similar, with 1977 data being equally representative of the other years.

DEW PoluT TEMPERATURE SPREAD 0 shows the diurnal curves of dew point temperature spread for the four comparison years.

Its depiction is unaffected by the missing data problems of the temperature and dew point curves given earlier.

The four curves are similar in shape and magnitude thus further depicting excellent temperature agreement between old and new tower si tes.

DELTA T 1 shows the diurnsi curves of delta T for the four comparison years.

Curve shapes are extremely similar.

The magnitude variations though small are significant because the magnitude of delta T is very critical in the determination of the stability class frequency as earlier depicted.

1974 data is more negative than the other curves indicating a higher A class stability frequency. The magnitude differences though do not vary from

what may be expected in year to year variability and the blasing by missing data as earlier explained.

SUMMARY

The data comparisons made in the previous discussions showed that old tower meteorological years 1974, 1975, and 1976 and new tower meteorological yec. '977 sre extremely compatible wi th any d'. iferences explainable through normal year variabili ty.

Every meteorological variable examined showed consistency in the yearly data sets. We are confident that the dispersion parameters taken f rom meteorological measurements at the new tower si te duplicate the dispersion paraneters that the old meteorological system produced at a time before conflicting factors made accurate data collection impossible.

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4 4 4 1 Proximity of New Meteorological Tower' to Significant Ground Features North Anna Power Station LAKE ANNA L OLD TOWER 272',1020' I gg NEW TOWER! NEAREST STRUCTURE 258',1600'; NEAREST 'U 250',1750' UNIT 1 CONTAINMENT NEAREST TRtE LINE GT 500' i I

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VIND DIRECTION PERSISTENCE PROBABILITY 10% 5% 1% YEAR PERIOD GREATER THAN (HRS) 1977* 29 4.1 75

• New Tower Data 1976+

32 4.7 8.6 +01d Tower Data 1975+ 2.6 38 71 1974+ 2.8 4.2

7.8 EXPLANATION

For 1977 the new tower data indicates a r 5 percent probab;)ity of continuous wind direction persistence periods greater than 4.1 hours. The maximum 22 1/2 degree range ,ction persistence episodes recorded from the 33 foot level ware: 1977* 1976+ 1975+ 1974+ 15 15 20 19 (Hours)

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• NORTH ANNA STABILITY CLASS FREQUENCY BASED ON DELTA T 1

1974 1975 1976 1977 STABILITY OLD TOWER OLD TOWER OLD TOWER OLD TOWER CLASS % FREQ % FREQ % FREQ % FREQ l l A 37 2 10 3 4.8 16.3 l B 32 2.8 19 4.1 C 4.6 38 2.2 47 0 25 9 35 5 35 7 32 3 E 16.5 33 5 37.3 28.1 F 75 92 96 10 5 G 53 4.8 85 3.8 i 1

i NORTH ANilA 33 FOOT LEVEL WIND SPEED FREQUENCY 1974 1975 19 7'6 1977 l WIND SPEED OLD TOWER OLD TOWER OLD TOWER NEW TOWER CLASS (MPH) % FREQ % FREQ % FREQ % FREQ Calm 0,8 0.8 0.8 0.7 1-3 27 5 22.4 20.4 26.2 4-7 39 2 42.4 34.8 46.1 8-12 24 9 23.5 26.1 20 9 13-18 6.8 8.1 12 5 50 19-24 07 2.0 4.4 1.'O > 24 0.1 07 1.1 0.1 j

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StWe*=ar NIF - .2.3-Eb 3-24-76 UPGRADED OM-SITE !ETEOROLOGICAL IEASURO!E? TS FROCitei FOR T 2.3.3.2 OPERATION

2. 3. 0.2.1 General Procram D_gscrintjon I

The on-site meteorological measurements program, as upgraded, for the North Anna Pouer Station will consist of conitoring wind direction and wind speed the lower tower level, dif fer-at two levels of a tower, ambient air temperature at ential air temperature between tower levels, horizontal wind direction fluctuation (o ) at both'ntover icvels, dew point temperature at the louer O i 2.3.3. tower level, and rain f all at the base of the neu Met tower (See F g. Total solar and sky radiation will continua to be recorded at the 2-1). i l current meteorological monitoring facility until the current r.cteorolog ca program is terminated as described below. The current and upgraded ceteorological systems will be operated concurrently Solar for not less than one year prior to phasing out the existing system. radiation monitoring will be transferred to the new Met tower f acility at The upgraded facility is scheduled to go into operation no later that time. i than 1:ovember 1, 1976. the end of Data from the current and upgraded systens will be compared at first concurrent year's operation. Location, Elevation and E::posure of Instrumento 2.3.3.2.2 The location for the new meteorological tower is shown on the topographic map, Distances and bearings to significant ground features are FJgure 2.3.3.2-1. The nearest structures are appror.itately.1500 shown on Figure 2. 3.3.2-2. The nearest tree is 480 feet south of the feet southwest of the location. Jocation nnd the nearest contiguous tree line is at a distance greater than tree line are 40-50 feet. Tree heights at the nearest 500 feet. The neu tower and the existing satellite tecer will have the same relative proximity to Lake Anna. Arend 43 l NA h

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