ML20031C690

Offsite Environ Radiological Monitoring Summary Jan-June 1974

ML20031C690
Person / Time
Site:	Yankee Rowe
Issue date:	09/05/1974
From:	YANKEE ATOMIC ELECTRIC CO.
To:
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ML20031C689	List: ML20031C688 ML20031C690
References
NUDOCS 8110070527
Download: ML20031C690 (10)

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j YANKEE ATOMIC EllafRIC COMPANY Offsite Environmental Radiological Monitoring 1

Summary of Survey Results i

i January 1, 197h - June 30, 197h i

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Introduction.

in compliance with reporting requirements set forth in the Yankee Atomic Electric Company Technical Speifications. Section 16.6.7.1.H, this report sunmarizes the results of the offsite environmental radiation surveillance program for the period' January 1,197h through June 30,197h.

Included with this report are the. iollowing:

1.

Table I - A summary of analyses for the period January 1,197h -

June 3u. 1974 - including for each media sanpled during the reporting period:

a.

Nunber of sampling locations b.

Total nunber of samples c.

Nunber of locations at which levels are found to be significantly above local established or concurrent backgrounds, and d.

Highest, lowest, and the average concentrations or levels of radiation for the sampling point with the highest average and a reference to the appropriate table describing the location of that -point with respect to the site.

2 Table II - II - Locations of sample points and monitoring stations.

3.

Table I - Minimum Detectable Activities by High Resolution Ge(Li)

Spectroscopy.

All analyses during the reporting period except the TLD measurements perfomed by plant perso7nel were perfomed by Teledyne Isotopes, Inc.,

Westwood, New Jersey.

Daring the period of this report, levels of plant related radioactive naterials above background as detemined by the environmental monitoring program do not indicate the likelihood of any public ir. takes or. exposure in excess of 1% of those that could result from continuous exposure to the concentration values listed in Appendix B, Table II, Part 20 of Title 10 of the Code of Federal Regulations. In addition, no statistically significant u ".ation of of fsite environmental concentrations with time were observed.

TLT readings taken at eight pointo on the plant restricted area fence (points 13, 15 - 21 in Table IX) indicate elevated exposure rates due to direct radiation from stored wastes and nic> ellaneous sources onsite.

However due to Yankee's isclated location, there is no likely significant increaa in exposare to any nenber of the general public. All points exhibiting an increase ucre located no more than J.1 mile from the center of the contain-nent. A1; s cher TLD sites including two at 0.$ miles and 0.3 miles from the contai.7.e! t showed no signif3 cant increase in exposure over the six month pe riod.

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n Air particulate filter sample handling procedures were ch:.nged foll,owing this six month period because of suspected contamination of filters during in-plant counting before shipment to Teledyne A gross alpha and gross beta analysis was made during this reporting period by plant personnel, supple-mentary to duplicate analyses by Telectre, using an in-plant counter routinely used for counting in-plant samples. Recent evaluations of data indicate the likelihood of trace filter contamination from this procedure, and in-plant counting of filters prior to shipment and analysis by Teledyne has been dis-continued until a new air particulate filter counter reserved solely for environmental sample analysis can be secured. The low levels of comenly assumed plant related isotopes noted at all air monitoring stations during the period cefore procedures were changed will be carefully compared in upcoming months to levels currently being measured to determine if sample contamination is indeed.the source of the activity noted. In addition, as part of Te'edyne's in-house quality control program an increased number of laboratory contamination surveys are being performed to ensure no low level contamination of samples in handling at their laboratory.

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TABLE I Tankee Atomia Electriz Company Offs 11e Envirermental Radiological Monitertag Swanary of Am1poos for forted January 1 - June 30. 197b For Sampling Point Wi*h Highest Samp11mg hint suuher of Leestaams' Type of Medie sempled Total Number Analysee Average level for ftriod eith Highest Sipiflotatly aboue

(" weber of Incettens) of Samples Performad Highest towest Aversgo Aversae Irvel Boekaround 3

Air Particulates (5) 125 weekly samplee Gros. Alpha (pC1/e )

<>.)E-2

<6.)E.h

<1.hE.) (e2) neervation Center (Table II) 0 (Continuous Sempler Grose Bata (gct/i=3)

(b. lgo.7 )E-1 (5.):0.9)E-2 (1.6 0.))E.1 rerd util had (f bt. II) 0 1

Operetten)

Gama Spectrue of Monthly Composite from each Sample Point (gC1/m))

Be-7 (2.0+0.h)E.1 (8.5 1. b)E.2 (1.6+0.))E-1(e5)

Ford Hill Road (T.ble II)

O (0.912.2)E-3 (6.272.2 7

Mn-5h (3.9 0.6)E-)

Ford Hill head (Table II)

O

<2.9L) )E.h (h.f*0.7)E-)

Ot,servation Center (Table H)

O Co-58 (6.9 1.2)t-)

Co.fo (1.5+0.))E-2

<I. ? E-)

( 7.2 + 1.2 ) E-3 Williaastown (Table II) 0 2r-95 (3.670.6)E.2 (h.):0.8)E-3 2.270.h)E-2 Ford Hill bad (Table n) 0 Ra-10)

(1.670.5)E.2 (2.2+0.h)D) 7 6.5 1.0)E.)

Ford Hill Reed (Table II)

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Ra.106 e6.0L2 (1.7:0.5)E.2 3.$70.6)E-2 observation Center (Table II)

O Co.13h

<8.05-)

(1.2 0.h)E.) (h.h7a.7)E-)

%ervetten Center (Table II)

O Co-137 (1.1+0.2)E-2 (1.270.h)R-J (C. 9)E-)

Fsed N111 apad (Toble n)

O Co-IL1

<1.1L2

<2.5L)

. 5L) obseavetten Center (feble II)

O (1.31 2)E.1 (1 5+0.))E.2 (6.71.1)s-2 Ford atti seed (Toble up 0

Co-1%

0 Radiochemistry en month 13com;osite (pC1/n )

(5.51 9)E-3 (6.8 1.1)E.k (6.911.1)S.)

Observetten Center (Table H)

O 3r.90 0

1 Charcoal Filter 125 weekly samplee I-131 (ey Ch teel

<7 35 2

<6.35-)

<1.65 2 observetten Cent.r (Table u) o Airborne Iodine (Continuous Sampler Separation - loe Operetton) t>ackground beta comt)

Mater (8)

LS Oreb Samples Oros Algha (pC1/17 80.5

<0.5

<0. 5 All 2tattene(Table III) 0 (Esch Station on a Oress Beta (pC1/1)

(1.1+0.2)S+1 2.)+0.h h.8+0.8 Sherman Pond (Table III)

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( 8.(+

MontAly Basis)

Trittun (pC1/1)

(1.270.h)E+4 <0.8,0.))E+)

(1.6:0.k)E+)

Sherman Spring (Table IH) 1 Sr-90 (gC1/1) 3.@.6 1.7+0.)

Harriman Reservoir (Table III) 0 Oasvue Spectrwn (pC1/1 by teetope)

=eEDL

=etDL eJtDa (el)

All Statione(Table III) 0 T.rrestrial 9 Oreb anaglee Ones Alghe (pC1/g.eet)

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'3

<0.1 All Statione (Table IV)

O Togetation (9) 5/21 5/22/7h Oroes esta (pci/g-est) e)

e) 6.0+1.0 Field 14b Site (feble IV)

O Sr.90 (pC1/g-eet) e)

e)

(2.3+0.h)E-1 Adama H1-Line (Table IT)

O Cama Spectra (gC1/g-est)

Be-7 e) e)

2.930.5 Adams H1-time (Tetla IT)

O E-b0 e) e)

6.h+1.0 WhitintW Line (Table IV) 0 tr-95

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(5.7+0.9)E-1 Whittnc* Line (Table IY) 1 Co-137 ej e)

(3.8!0.6)E-1 (dams Hi-Line (Table It) o Co-lu e) ej h.1+0.6 Whitir' ghee Line (Table IF) 1 Th-228 e) e)

(1.530.6)E.1 Herriman Station (Table IV) 0

' Anil (9) 9 Samples (Esch Crose Alpha (pC1/g) ej e) 5.9+2.5 Dwear Brock (Table IV) 0 Station During May)

Gross reta (gC1/g) ej ej

().f*0.5)E+1 williamstown+ penbar Brook (9stle N) 0 3r."0 (pC1/g) ej e)

(5.971.215-1 Ade=e ni-Line (Tabt. N) 0 Casene Spectrues (3 14 )

C E.hD e) e)

[1.7,0.))E+1 W1111ameteen (Table 17)

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Flent Site (tab's It) 1 Mn-5h e)

-j i.61.c)E-2 7

F) mat atte (sanne IV) 1 Co-60 ej ej d.90.9)s.g.370.9)5-1Adn"e E1-Line (Toble N)

O Co-137 e)

.)

m 226 e) e)

1.6 5.6 it1* W (Tenne N )

0

+

Th-220 e) e)

1.2[+0.2 Damer aswek (Table It) 0 1

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TWAI (Continued)

Tankee Atonio Electric CompanF Offsite Environmental Radiological Monitoring Samary of Analysee for Period January 1 June 30,197h yor Sampling Point With Highest Sampling Point geber of 1meetions Type af Media Sampled Total Weber Analysee Average Level for 1%riod with Highest Significantly Abees (Number of Incatione) of Samples Performed Highest Lowest Aversta Average imvel background Maple Syrup (2) 2 Grab Samples Sr-90 (pC1/ml) e3 e3 (1.8+0.))s-1 feber Farm (Tobin TI) 0 (Each Station Dama Spetre (5C1/m1)

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3/15/7k)

E-Lo 2.v+0.5 Teher Fam (Table TI)

O Co 137 (1.i+0.3)g-1 Triamadell's Sugar House (Table TI) 0 Squetill Plante ())

3 Oreb Samples Sr-90 (pci/g-wet) e3 e) 1.8+0.3 Shemen rond (Table TII) 0 (Esch Station Ihrisy May)

Gama Spectrum (gC1/g-wet)

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Be-7 e3 e3 1.8+0.3 Sheman Pond (Table VII) 1 E-LO e3 e3 7.7.3 Harriman Reservoir (Table VII) O Mn-5h e3

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( 6. 3 +2.1 )t-3 Deerfield River (Table CI) 1 tr-95

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e3 (2. LEO.5)E-1 Sherman rond (Table TII) 0 Re103 e3 e3 (1.1+0.h)R-1 Sheman Pond (Table TII) 1 Cs-137 e3 e3 1.15.2 Harriman Reservoir (Tanle VII) G Co-IR e3 e3 1.h*0.2 Sheman Pond (Table VII) 1 Th-228 e3 e) (k.6:0.7)s-1 Harriman Reservoir (Table VII) 0 River Sediment (1h) Ik Oreb Samples Cross Algha (pC1/g-dry)

1. 3

+3 (2.3+0.8)E 1 Above Sheman Dus (Table T) 0 e

• 3 (3.670.6)E+1 Above Sherman Dam (Table T)

O (Esch Station Duririg May) Oross Beta (pci/g-dry) 3 Sr-90 ( Ci/g-dry) 3 e3 (6.kil.1)E-1 Above Sherman > (Table T) 0 Oama Spectra (gCi/gdry) Be-7 e3 e3 (5.L+1.1)E-1 North River (Oriswoldv111e Dam) (Table T) 0 K-LO +3 +3 (1.L + 0.2 )E+1 No. 5 Station Pond. Harriman Stat *eu (Table T) O (h.87.6)E-2 Condenser outfall (Table T) 1 Mn-5L 3 e3 1 Co-M e3 e) (L9{0.8)t-1 Condenser outfall (Table T) 3 Zr-95 e3 e3 (9.h 1.9)s-2 North River (Griswoldv111e Daa) (Table T) 0 au-106 e3 e3 (3 0+o.7)E 1 North River (Oriswoldv111e Iha) (Toble T) O (9.L7.6)E-1 Above Shermen Dam (Table T) 1 Co-137 e3 e3 1 Co-1% +3 e) (h.270.7)S-1 North River (Criswoldv111e Dan) (Table T) 0 m 226 e3 e3 1.2+5.3 Condeneer Outfall (Table Y) 0 Th-228 e3 ej (9.3;1.6)t-1 brfieli River - Mohawk Part (Table T) 0 F11h (3) 3 Oreb Samples Sr-90(pci/g-wet) e3

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(2.1+0.L)E-1 brfield River (Table TII) 0 (3.2 0.3)E-1 Leerfield River (Table VII) 0 1Each Station During May) H-3 (bound water, pC1/g-wet) *) e3 1 Cama Spectrum (pci/g-wet) E-LO

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e3 3 9+0.7 D'*rfield River (Table TII) O Co-13 7 e3 e3 (1.9[0.3)s-1 Shannan Pond (Table VII) O Milk (2) 12 Greb Semples Sr-90 (gC1/1) <0.8~ ))S+1 <0.3 e0.3 Mt. Williams Farm (Table TI!!) 0 (1.b+0. 6.0+1.0 9.9+1.6 F.inCaley Fem (Table VIII) 0 (Monthly from each I-131 (I i/1) C Station) Camma S octrsse (gC1/1) E-LO e3 +3 (1.60.2)t+3 Eingsley Farm (Teble TIII) O Co-137 e3 e3 (2.)+0.8)E+1 Mt. Wil11ame Farm (Table TIII) 0 Thermolminsecent h32 (Integrated Monthly Monthly Exposure 2h+8,*1.0 15.8 1.2 20.L13.5 Station no.18 (Tabt. II) 8 (eb) Dosisetere (22) Samples - h readirige/ (ar/ month) 1 site /nonth) El All samples showed less than minimm d6tectable activity (MDL) by high ek All TIA statteras exhibiting increaves above backgromd are located on resolution Oe(Li) spectroscopy. See Table I' restricted area fence, e significant distance frua populated armes. se averages for eli media eenpated by imelodiss isless repos4ed ao lose them e$ All data listed (eacept TfD data) were messesed by the analyttent sentreeter,, a detectica limit as if they were metan11p at the detmetion limit. Then Teletres Isotopes, and represent the messerement (or average of a member of all averages are upper limit salene. maneuremonte) e evere11 error of analysis. This overall error is the see of n somti'ig errero, enlibretiom errore semple --sung errore, and esople,.. C3 Average based on er4 ese value. Thes high,1su, and everage voles are errore, all at the 995 seafidenne level. Bones 1.41= 1.0 a 10*1 identical. s u.

TABLE II Air Monitoring locations Location Distance from Plant (miles) Azimuth Furlon House 0.5 232 0 Harriman Station 2.0 357 Ford Hill Road 1.7 152 0 Observation Center 0.3 359 Willianstown Mass. 13.8 265 TABLE III '4ater Sampling Locations Distance from Discharge Incation Point (in miles) Direction Sherman Pond - Discharge Area .05 3h9 Bear Swamp - No. $ Station 3.9 Downriver Harriman Station 2.2 Upriver Plant Potable (Onsite Well) Harriman Reservoir 6.3 Upriver Distance from Center of Vapor Container (miles) East Stom Drain .09 6 0 West Storm Drain .10 280 Sheman Spring .11 30h 6 _ __ OL ..A i E T _. Natm-u -5 sen-m

w n l TABLE IV Soil and Vegetation Sampling Locations Distance from Center Location Vapor Container (miles) Azimuth Plant Site .07 132 Dunbar Brook 2.0 216 0 West Cemetery 2.0 150 Harriman Station 2.0 359 Field Laboratory Site 0.6 230 Crossroad 2.2 830 0 Whitingham Line 2.2 32 Adams Hi-Line .3 289 Williamstown 13.6 265 TABLEJ River Sediment Sampling Locations Location Distance from Discharge Point (River Miles) Direction Sherman Pond (Condenser Outfall Area) 05 3h9 0 Sherman Pond (Above Sherman Dam) .11 320 No. 5 Statior. Iond (Below Sherman Stati an Spillway) 3h Downriver No. 5 Station (Above No. 5 Canal Entrance) .70 Downriver Deerfield River (Upstream of Rte. 2 Bridge at Mohawk Park) 13.h Downriver Iberfield River (Near Gar Chris Motel) 18.6 Downriver Deerfield River (No. 6 Station Pond) 22.5 Downriver Confluence of Deerfield River with North River 23.6 Downriver Harriman Station (from foot bridge) 2.1 Upriver Harriman Reservoir (3 Upriver

r TABLE V (Cont.) Distance Upriver of Confluence of Location North and Deerfield Rivers Direction North River (Griswoldville) Dam Pond Above) 32 Upribr North River (fomer Lyonsville Dam Site) h.5 Upriver North River (West Branch) 3.9 Upriver North River (Griswoldville Ihm, Pond Below) 30 Upriver TABLE VI Maple Syrup Sampling Locations location Distance from Plant __(miles) Direction Truesdell's Sugar House Colrain, MA 10.5 E Veber Fam Rowe, Massachusetts 2.5 S TABLE VII Fish and Aquatic Plant Sampling Locations Distance from Discharge location Point (in miles) Di ection Sheman Pond (Southern End Near Discharge Point) 0.1 N Deerfield River i (#h Station Reservoir) 22.5 Downriver Harriman Reservoir 6.2 Upriver TABLE VIII Milk Sampling Iocations location Distance from Plant (miles) Azimuth Kingsley Fam Whitingham, VT 2.2 h5 Mt. Williams Dairy Willianstown, MA 13.0 258

7 y. .~ it, f; 4 . 0 l ?, TABLE IX TLD Monitoring Sites Zone I Distance from Center Station Number Location of Containment Bldg. (miles) Azimuth 1 Furlon House 0.6 2320 2 Observation Booth 0.3 3 13 3 Ford Hill Ibad 1.7 152o h He criman Station 2.0 359 0 5 Monroe Bride 0.8 2h0 6 'Readsboro Road Barrior 0.8 355 7 1A.itingham Line 2.2 '32 ) 8 Mor.coe Hill Barricr ,1.1 182 9 Dunbar Brook 2.0 216' 10 Croi s Road 2.2 '830 11 Adams High Line 1.3 289 12 Readsboro, '!enwnt 3.h 3th 13 Restricted Area Fence .05 255 Rest ~icte'd Area Fence .57 300 15 Restricted Area Fence .05 3h5 16 Restrictea Area Fence .08 30 i 17 Restricted Area Fence .09 70 18 Restricted Area Fence .09 115 19 Restricted Area Fence .10 R0 20 -Restricted Area Fence .10 16) 21 Restricted Area Fence .07 205 3 - 22 Williamstown Substation 13.8 26$0 f e 0 ~

't TABLE X Environmental Sample Detection Sensitivities by High Resolution Ge(Li) Gamma Spectroscopy Water (1 liter) Soil 4 Vegetation Filters Nuclide pCi/ml (1000 gm) pCi/gm pCi/ Total Filter Be7 0.06 0.1 60 Cr51 0.06 0.1 60 54 2 0.006 0,01 6 CoS8 0.006 0.01 6 Co60 0.006 0.01 6 Se73 0.052 0.09 52 Fe59 0.011 0.018 11 2r95 0.011 0.019 11 l03 0.007 0.011 7 Ru Rul06 0.06 0.1 60 1131 0.008 0.013 8 I l34 0.007 0.011 7 Cs l37 0.007 0.012 7 Cs 140 Ba 0.025 0.042 25 La140 0.006 0.01 6 141 Cc 0.012 0.02 12 l I44 Ce 0.052 0.09 52 40 i K 0.052 0.09 52 226 Ra 0.012 0.021 12 Th228 0.012 0.021 12 I Above values are those quoted by Teledyne Isotopes, Inc., the analytical contractor for the Yankee Atomic Electric Company environmental monitoring program. l l l ( .}}