ML17037B669

Letter Responding to a 09/29/1976 Letter Requesting Additional Information Regarding Compliance with 10CFR50, Appendix I

ML17037B669
Person / Time
Site:	Nine Mile Point
Issue date:	11/01/1976
From:	Rhode G Niagara Mohawk Power Corp
To:	Lear G Office of Nuclear Reactor Regulation
References
Download: ML17037B669 (22)

Text

NRC I'ORM 195 U.S. NUCLEAR REGULATORV C VIISSION DOCKET NUMBER I2 7G) 50>>220 F I LE NUMBER NRC DISTRIBUTION FoR ART 50 DOCI(ET MATERIAL FROM: DATE OF DOCUMENT Mr. George Lear Niagara Mohawk Power Corp. 11176 Syracuse, New York DATE RECEIVED Mr. Gerald K. Rhode 11 5 76 NfLETTER QNOTORIZED PROP INPUT FORM NUMBER OF COPIES RECEIVED fgfo R I G I N A L One signed A@UNCLASSIFIED Ocopv ree copies encl recvd.

DESCRIPTION ENCLOSURE.

Ltr. w/attached. ~ .re our 9/29/76 1'tr.. ~

trans the following: Nine Mile Site Combined Annual Grazing Seas'on and Monthly Wind Roses for 1974 and 1975-Pasquill Stability Classes 30, 100 and 200 Foot Levels~

(to-P) (300-P)

PLANT NAME: ACKNOWLEDGED Nine Hile Point Unit 81 DO NOT REMOV@

SAFETY FOR ACTION/INFORMATION 11 5 76 QSQT&'M%A /DE ASS C'NF.D AD ~

BRANCH CHIEF: Lear PROJECT )IANAGER: Nowicki PRO E IANA LIC ASST Parrish INTERNAL DISTRI BUTION IEB FILE SYSTEMS SAFETY SITE A NRC PDR HEXNEHAN

'CHROEDER W XKJ' BENAROYA ~

N OELD I GOSSICK & STAFF ENGINEERING IPPOLITO FNV MIPC MACCARRY K RKWOO CASE KNIGHT

)IANAUER SIHWEIL OPERATIN REAC 0 S PAWLXCKX RO ECT IIANA .EIIEN REACTOR SAFE'IIY BOYD P COLLINS HOUSTON PETERSON MELTZ

'XSENII ROSS NOVAK ROSZTOCZY CHECK SHAD BUTI,ER

.RIME S LL51E IIEI.TEHES AT & I UHCI SKOVIIOLT SALTZIIAN OLLIN RUTBERG EXTERNAL DISTR II3UTION CONTROL NUMI)LR LPDR: Oswe o TIC:

N.Y. NAT IAB:

BEG ~ VIE BROOK))A g~Q~

ULRIKSON {ORNA NSIC:

ASI.B LA )DR CONSUI.TANTS rimWS

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NIAGARA MOHAWK POWER CORPORATION NIAGARA 300

~ MOHAWK KRIK BOULKVARO WKST SYRACUSC, N.Y. I3202 November l, l976 Director of Nuclear Reactor Regulation Attn: Mr. George Lear, Chief Operating Reactors Branch ¹3 U. S. Nuclear Regulatory Commission washington, D. C. 20555 Re: Nine Mile Point Unit l Docket No. 50-220 DPR-63

Dear Mr. Lear:

Your letter dated September 29, l976 requested additional information regarding compliance of Nine Mile l

Point Unit wi th 10CFR50, Appendix'. Provided 'herewi th is our response to this request.

Very truly yours, NIAGARA MOHAWK POWER CORPORATION GERALD K. RH DE Vice President - Eng'neering gqt

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Attachment ~ S. IIIICI~~< II~~

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guesti on l (Bl)

Provide the joint frequency distribution of wind speed and direction by atmospheric stability class (Tables Bl-5 through Bl 9) such that:

l) the atmospheric stability classes are as defined in Regu-latory Guide l.23 and include Classes A through G; and

2) calms are not included in the 0-3 mph wind speed class, but rather're listed separately for each page of these tabl es.

R~es nse Joint frequency distributions of wind speed and direction by Pasquill Classes A through G in accordance with the atmospheric stability classes listed in Regulatory Guide l.23 are given for the 30-ft., l00-ft. and 200-ft. levels in Attachment l.

All data are from the Nine Mile Site meteorological tower for l974 and l975. The 200<<ft. and 30-ft. distributions are presented in response to the Nine Mile Point Unit l request and the l00-ft. distributions are presented in response to the James A. FitzPatrick Nuclear Power Plant request.

I'n addition to the individual stability classes, an all sta-

~bilit wind rose, and a direction versus s eed wind rose follow each di stri bu ti on by ti me period. Calm hours are not included in the one to three mile per hour wind speed class, but are listed by each stability class.

The joint frequency distribution of wind direction and speed by Pasquill stability classes for the combined years l974 and l975 for the 30-ft. level is given in Table l. Table 2 shows the distribution foz the l00-ft. level and Table 3 for the 200-ft. level. Tables 4, 5 and 6 give the combined grazing season wind roses by Pasquill stability classes for the'0-ft.,

l00-ft. and 200-ft. levels, respectively. Combined monthly stability wind roses for the 30-ft. level are presented in TaMe 7, for the l00-ft. level in Table 8, and for the 200-ft.

level in Table 9.

r p Question 2 (2)

The stability classes on pages l0, ll, and l2 of Table B2-3 appear mislabeled. Please correct.

R~es ense The tables were mislabeled; corrected tables are included in this resporise. l'n addition, 9 of Table B2-3, which it is was necessary to correct attached. The Star program page for 1967 combined Classes 8 and F and are so noted on the corrected tables.

ATMOSPHERIC STABILITY FROM STAR PROGRAM FOR SYRACUSE 1967 Nine Mile Point Nuclear Station - Unit 2 Niagara Mohawk Power Corporation Annual Fre uenc Distribution Station ~ Syracuse N.Y. 1/67-12/67 Speed (Kts)

Direction 1-3 4 - 6 7-10 11 16 17 21 Greater than 21 Avg Spd Total N 19 0 0 0 6.2 33 NNE 0 0 4.9 hE ENE 25 0

0 0

0 0

0 4.6 5.5 v

34

~

E 17 30 0 0 '0 5.5 116 ESE 14 13 0 0 :0 5.0 85 SE 12 36 0 0 0 4.8 54 SSE 17 0 0 0 5.1 26 26 0 0 5.4 0 0 0 5.5

, 13 0 0 0 6.0 22 WSW 10 18 0 0 6.2 34 10 12 12 24 17 0

0 0"

0 0

0 0

0 0

7.3 6.4 6.6

~

37 32 16 12 0 0 0 6.1 31 AVG 2.7 1 8.3 0. 0 0.0 0.0 5.3 TOTAL 88 343 173 0 0 .0 NEER OF OCCURRENCES OF E AND F STABILITIES ~ 645 NUMBER OF CALM WITH E AND F STABXLXTIES ~ 41 Page 9 of 12

t ATMOSPHERIC STABILITY PROM STAR PROGRAM FOR SYRACUSE 1967 Nine Mile Point Nuclear Station - Unit 2 Niagara Mohawk Pover Corporation Relative Fre uenc Distribution Station ~ Syracuse N.Y. 1/67-12/67 Annual Speed (Kts)

Direction 0-3 4-6 7-10 ll -'6 17 21 Greater than 21 Total N 0.001742 0.006500 0.003763 0.000000 0.000000 0.000000 0.012006 0.000537 0.001711 0.000342 0.000000 0.000000 0.000000 0.002590 NE ENE 0.001792 0.001938 0.003079 0.008553 0.000342 0.002053 0.000000 0.000000 0.000000 0.000000 0.000000 0 F 000000 0.005213 0.012543

~ i 0.008615 '.023606 0.000000 0.000000 0.000000 0.042484 0.010263'.004447 ESE 0.007133 0.019843 0.000000 0.000000 0:000000 0.031423 SE 0.005668 0.012316 0.002053 0.000000 0.000000 . 0.000000 0.020036 SSE 0.002427 0.005816 0.001368 0.000000 0.000000 0.000000 0.009611 0.003469 0.008895 0.003079 0.000000 0.000000 0.000000 0.015443 SSW 0.000945 0.002053 0.001026 0.000000 ~ 0.000000 0.000000 0.004024 SW 0.001172 0.004447 0.002395 0.000000 0.000000 0.000000 0.008015 WSW 0.002573 0.003421 0.006158 0.000000 0.000000 0.000000 0.012153 0.001449 0.003421 0.008211 0.000000 0.000000 . 0.000000 0.013081 0.001515 0.004105 0.003763 0.000000 0.000000 0.000000 0.009383 0.001515 0.004105 0.005816 0.000000 0.000000 0.000000 0.011436 0.001645 0.005474 0.004105 0.000000 0.000000 0.000000 0.011224 0.044133 0.117345 0.059186 0.000000 0.000000 0.000000 RELATIVE FREQUENCY OF OCCURRENCES OF E AND F STABILITIES ~ 0.220664 RELATIVE FREQUENCY OF CALMS DISTRIBUTED ABOVE WITH E AND F STABILITIES ~ 0.014027 Page 10 of 12

l ATMOSPHERIC STABILITY FROM STAR PROGRAM FOR SYRACUSE 1967 Nine Mile Point Nuclear Station - Unit 2 Niagara Mohawk Power Corporation Annual Fre uenc Distribution Station Syracuse N.Y. 1/67-12/67 Direction 1-3 4-6 7-10 11 - 16 17 21 Greater than 21 Avg Spd Total N 10 45 53 38 8.9 154 NNE 4. 13 0 0 6.4 27 25 14 0 0 6.0 46 47 50 12 0 7.0 116 26 125 149 55 7.7 364 ESE 21 92 54 14 0 6.1 182 SE 18 62 52 17 0 6.9 151 SSE 24 42 28 0 9.2 107 47 70 77 22 10.2 230 SSN 16 54 41 0 10.7 130 SW 26 55 45 9.5 136

'VSM 30 88 72 21 10.5 224 31 134 125 60 32 12.5 391 6 29 62 85 21 14 11.9 217 NW 27 68 81 34 11.5 219 NNN 27 59 53 18 10.4 164 AVG 2.7 5.1 8.4 13. 1 18. 3 24.9 9.5 TOTAL 151 666 1010 748 221 62 TOTAL NUMBER OP OBSERVATIONS ~ 2923 TOTAL NUMBER OP CALMS ~ 65 Page 11 of 12

'C ATMOSPHERIC STABILITY FROM STAR PROGRAM

'FOR SYRACUSE 1967 Nine Mile Point Nuclear Station - Unit 2 Niagara Mohawk Power Corporation Annual Relative Fre uencv Distribution Station ~ Syracuse N.Y. 1/67-12/67 Speed (Kts) r Direction 0-3 4-6 7 10 11 - 16 17 21 Greeter than 21 Total 0.004918 0.015395 0.018132 0.013000 0.002395 0.000342 0.054183 NNE 0.001831 0.004447 0.002053 0.001368 0.000000 0.000000 0.009700 NE ENE 0.002896 0.003865 0.008553 0.016079 0.004790 0.017106 0.000342 0.004105 0.000000 0.000000 0.000000 0.000000 0.016381 0.041155 0:

0.013005 0.042764 0.050975 0.018816 0.002737 0.000342 0.128639 0.010260 0.031475 0.018474, 0.004790 0.000342 0.000000 0.065340 SE 0.008336 0.021211 0.017790 0.005816 0.000684 0.000000 0.053837 SSE 0.003239 0.008211 0.014369 0 '09579 0.002053 0.000000 0.037450 0.005342 0.016079 0.023948 0.026343 0.007527 0.001026 0.080265 SSW 0.001543 0.005474 0.018474 0.014027 0.005474 0.000000 0.044992 SW 0.002185 0.008895 0.018316 0.015395 0.001711 0.000342 0.047344 NSM 0.003771 0.010263 0.030106 0.024632 0.007184 0.001711 0.077660 0.004168 0.010606 0.045843 0.042764 0.020527 0.010948 0.134855 0.003005 0.009921 0.021211 0.029080 0.007184 0.004790 Oe075191 0.002582 0.009237 0.023264 0.027711 0.011632 0.001368 0.075794 NAl 0.002951 0.009237 0.020185 0.018132 0.006158 0.000342 0.057005 TOTAL 0.073&97 0.227848 0.345535 0.255901 0.075607 0.021211 TOTAL RELATIVE FREQUENCY OF OBSERVATIONS ~ 1.000000 TOTAL RELATIVE FREQUENCY OF CALMS DISTRIBUTED ABOVE ~ 0.022237 Page 12 of 12

guestion 3 (B4)

Provide the starting speeds of all anemometers and wind vanes listed in Table B4-1.

R~es ese The F400 Climatronics wind set 'has a threshold speed of 0.58 miles per hour for both the anemometer and vane. This is reported in Air Pollution and Meteorological Instruments by by Climatronics Corporation.

All Bendix Aerovanes on the Nine Mile Site meteorological tower are reported to provide full tracking at 2.5 miles per hour in the Bendix Environmental Catalo ue on the specification for Aerovane tzansmi tter.Model 120, page ESD021C. However, research performed by Brookhaven National Laboratory under the auspices of the Atomic Energy Commission found a nominal threshold speed of le7 miles per hour for the Aerovane impeller. This is reported in the Hind Tunnel Tests on Seven Aerovanes, BNL 1142.

Question 4 Discuss the land/sea breeze circulation at the site, and it's relation to air Slow trajectories over the region.

R~es oose The lake breeze effect at Nine Mile site was considered in the analy-

"sis, and our evaluation centered on two key questions. Could the lake breeze (l) affect the X/Q values significantly and (2) is the lake breeze frequent enough to warrant a special'nalysis. In our judgment the answer to both questions is no. Ve concluded that it was not necessary to adjust ei ther the meteorological data or the X/Q values to account for the small effects involved.

s lake breeze exists, the flow of air from Zake Ontario over When a the land is more stable (having less diffusive capacity) than it is after the flow has moved inland Sar enough to become heated.

This implies that an estimate of X/Q which assumes that the relatively stable conditions existing at the si te tower remain un-changed as the effluent moves inland would tend to make X/Q an overestimate progressively with time and distance.

In addition to this change in the diffusive capacity, one of two other effects would be present. If the wind gradient were also onshore, the influence. of the lake breeze would simply be to increase the speed of the flow, also favoring greater diffusion.

If on the other hand, the flow gradient flow were in opposition to the would proceed inland and then tend lake breeze, the onshore to rise before flowing back out over the lake. Both of these effects would tend to decrease X/Q below the estimates made at inland locations distant from the plant.

The reverse Slow pattern occurring at night is known as a land breeze. This flow would carry effluent from the plant out over the lake where stable air, and ititmight remain more concentrated in relatively could be brought back inland again at a later time. Such a recirculation could bring radioactivity back over the land after fore, add an it had passed out over the lake, and might there-imcrement to the X/Q values. If one were to assumeR for example, that the effluent moved out over the lake five miles and returned over the land the following day, the X/Q values in the immediate shore'sarea might be increased by 30 percent on that day. However, the number of days which this would occur is small.

R~es onse (Conti need)

Another consideration is whether the lake breeze might cause, changes in the air f2ow trajectory so that the apparent, wind direction at the site was unrepresentative of the travel of the plume. In a given si tua ti on this might be true, so tha t the X/0 predi cted at a given location might really be found somewhere else.

On a long-term climatological basis, however, it is highly unlikely that such changes would affect the X/0 estimates significantly.

ln the first place, the 2ake breeze frequency represents no more than 5 percent of all hours at the site for 2974 and 2975. This was de-rived from the number, of hours the wind blew from the 292.5o through 360 sectors wi th speeds less than 23 miles per hour, regardless of the time of day from April through September, the period of'ikely 2ake breezes. Secondly, the initial direction of the onshore breeze itself varies over a wide arc and downwind abberations of these directions are quite likely to smooth out'ver a number of cases. It seems appropriate to point out also that an extremely accurate definition of X/0 values would in fact require continuous tracer studies over at least a year. At a site having very simple terrain and meteorology, it is very difficult to define three-dimensional trajectories and diffusion precisely, even if a dense network of observational stations are used.

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