Text

Offsite Environ Radiological Monitoring:Summary of Survey Results,Jan-June 1975
	ML20031C186
Person / Time
Site:	Yankee Rowe
Issue date:	09/08/1975
From:	; YANKEE ATOMIC ELECTRIC CO.
To:	;
References
	NUDOCS 8110060615
	Download: ML20031C186 (24)
	v • d • e

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60-L9 YANKEE ATOMIC ELECTRIC COMPANY OFFSITE ENVIRONMENTAL RADIOLOGICAL MONITORING

SUMMARY

OF SURVEY RESULTS January 1, 1975 - June 30, 1975 RETURN TO DIRECTORATE OF REGULATORY OPERA lei 2e8eA"d8808h R

PDR

e REPORTING METil0D FOR OFFSITE ENVIRONMENTAL RADIOLOGICAL MONITORING I.

What is Reported The following is reported for each particular measurement (gross beta, SrCO, etc.) and each isotope of a gamma spectrum:

1.

The high, low, and the average of all real values for the Zone I stations 2.

The high, low, and the average of all real values of the Zone II stations 3.

The high, low, and the average of all real values for the station with the highest average value 4.

The number of stations which are significantly above background II.

How the Numbers are Generated 1.

A number is reported as positive provided that its value is greater than the 3 o counting error 2.

When the real value for a particular analysis is lower than the detection limit, the value is reported as less than ("L.T.") the particular detection limit For a specific sample site, medium and analysis, several values will be averaged depending on the sample frequency.

For the case where all the values are positive, the average is based on all the values.

The standard deviation of the average is calculated by taking the squar'e root of the sum of the squares of the individual deviations and dividing by the number of values.

Where there are mixed positive and "Less Than" values, only the positive values are used in the average. The standard deviation is also based only on the positive values.

The ratio of the number of positive values to the total number of values (both positive and "Less Than") is given for each average.

Where no "L.T."

values have been reported for a specific analysis on a particular media the appropriate nominal detection sensitivity as supplied by the laboratory will be used as the LLD value.

Where there are "L.T." values reported for a specific analysis on a particular media the high, low, and average of the "L.T." values is given as the LLD.

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g 1

INTRODUCTION In compliance with reporting requirements detailed in Yankee Atomic Electric Company Technical Specification Section 16.6.7.lH, this report summarizes the results of the offsite environmental radiation surveillance program for the period January 1, 1975 - June 30, 1975.

Included with this report are the following:

1.

Table I - A summary of analyses for the period January 1, 1975 through June 30, 1975 - including for each media sampled during the reporting period:

a.

Number of sampling locations b.

Total number of samples c.

The high, low, and the average of all real values for the Zone I stations.

d.

The high, low, and the average of all real values of the Zone II stations.

e.

The high, low, and the average of all real values for the station with the highest average value.

f.

The number of stations which are significantly above background.

(at the p = 0.01 level) g.

The ratio (f) of the number of positive values to the total number of values (both positive and "Less Than") is given for each average.

2.

Table II - IX

-Locations of sample points and monitoring stations.

3.

Table X - Minimum detectable activities by high resolution Ge(Li)

Spectroscopy.

See Note to Tabic II for explanation of Zone I, Zone II All analyses during the reporting period, except the TLD measurements made by plant personnel, were performed by Teledyne Isotopes, Inc., West-wood, New Jersey.

During the period of this report, levels of plant related radioactive materials above background as determined by the environmental monitoring program do not indicate the likelihood of any public intakes or exposures 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 signift-cant variation of offsite environmental concentrations with time were observed.

TLD readings made at nine points on the plant restricted area fence (points 13 - 21 in Table IX) indicate elevated exposure rates due to direct radiation from stored wastas and miscellaneous sources onsite. However,

e 2

s due to Yankee's isolated location, there is no likely significant increase in exposure to any member of the general public. All points exhibiting an increase were located no more than 0.2 kilometers from the center of the containment. Ali other TLD sites -including two at 0.8 kilomet'ers and 0.5 kilometers from the containment building showed no significant increase in exposure over the six month period. TLD readings are routinel),made by Yankee Rowe personnel on monthly integrated measurements at twenty-two ocations.

An anomalous offsite result noted this period was the Co-60 activity'in soil (1.2 pCI/gm-wet) measured in the Dunbar Brook sample collected on 5/19/75.

This activity corresponds to about 10 mrem / year whole body expo'ure assuming s

70 percent occupancy, activity dispersed uniformly in g5 cm surface soil

^

2 sample, and a Co-60 whole body dose factor of 1.5 X 10 mrem / year per pCi/m,

Positive Co-60 activity in soil has never been noted offsite above 0.1 pCi/ga.

Since there were no elevated Co-60 releases during this period, all evidence points to likely cross contamination of samples in handling. A number of environmental measurements are inconsistent with the elevated soil Co-60 value noted at Dunbar Brook or any other station.

In addition, Cs-137 levels at th.nbar Brook were lover than several other stations and consistent with background levels. Also, no Co-60 was detected in soil at the Field Lab site, which is in the same downwind see: tor as Dunbar Brook, but several kilometers closer to the plant. Airborne Co-60 levels noted in monthly composite air particulate filter analysis indicate one positive Co-60 value at Station A4 for March (2.1 E-3 pCi/m3) and one positive value at Station Al 3

in June (1.5 E-3 pCi/m ).

The maximum airborne Co-60 levels noted for this period at any station is far below that which would lead ~to the Co-60 soil activity noted at Dunbar Brook.

/

Finally, background radiation measurements made at Dunbar Brook do not indicate any increase in total background radiation exposure ratcs in 1975 over 1974 when no Co-60 was detected in soil.

Total integrated exposure measured with TLDs during January - June 1974 for Dunbar Brook and Williamstown Substation (the background station) was 37.7 mR and 43.8 mR, respectively.

Sim-ilar measurements during January - June 1975 were 38.2 and 47.8 mR,

, indicating a slight drop during 1975 of exposure rate at Dunbar Brook relative to a background station from an earlier year. Periodic high pressure Jon chamber surveys have been made of exposure rates at all TI.D stations er d these also indicate no increase in exposure rate at Dunbar Brook from a year ago.

Surveys taken in February and May 1974 indicate an average exposure rate at Dunbar Brook and Williamstown of 10.8 and 9.1 pR/hr, respectively.

A high pressure ion chamber survey ;.ade on April 29, 1975 indicates tn exposure rate of 8.0 and 10.6 pR/hr for Dunbar Brook and Williamstown, respectively, clearly showing no significant increase in expo =ure rate at Dunbar Brook over earlier years, but rather a drop of several pR/hr since the same period last year.

It is standard practice to take duplicate samples of all soil samples.

The duplicate soil sample collected at Dunbar Brook on 5/19/75 has been taken from storage and sent to Teledyne for analysis to check the original result.

Results

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3

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r are not yet available.

Secondly, a new set of samples were collected at Dunbar Brook during August 1975 at several depths to check for the presence and depth distribution of plant related isotopes. The results of these followop analyses will be reported in the next semi-annual report.

Should followup positive results be noted at levela corresponding to public exposures or intakes in excess of one percent of those that could result from continuous exposures to the concentration values listed in Appendix B. Table 2, Part 20 of Title 10 ef the Code of Federal Regulations, an estimate of the likely resultant exposure toindividuals and to population groups shall be made.

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Tots 1 L'enbcr of All Icdiestor Lees: ions Lo:stien with M12hes: A.nual yean -

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C (0.1-0.4)

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(0.45-3.9)

Dat.) 0.19 km W(370')

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(0.68-1.27)

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14 YANKEE ROWE Locations of Sample Points and Monitoring Stations TABLE II Air Monitoring Locations Sampling and Analysis Frequency Gross Alpha and Gross Beta - Weekly / Gamma Isotopic - Monthly Distance (04)

Location from Plant Azimuth Zone I Al Furlon llouse 0.8 232*

A2 liarriman Station 3.2 357*

A3 Ford 11111 Road 2.7 152*

A4 Observation Center 0.S 313*

Zone II A5 Williamstown, Mass.

22.2-265*

NOTE:

Zone I (indicator) locations are those locations considered within the possible influence of routine plant releases.

Zone II (control) locations are considered outside the influence of plant operations.

Monitoring of control and indicator stations allows comparisons of activity in sample media while minimizing the problem of changes in nature' or fallout exposure rates or levels of activity from causes not related to station operation.

O ee, new

_m-'

we=

_ ww a-w e o a

w

15 TABLE III Water Sampling Locations Sampling'and Analysis Frequency - Monthly Distance from Location Discharge Point (KM)

Direction Zone I W1 Sherman Pond -

Discharge Area 0.1 349' W2 Bear Swamp -

No. 5 Station 6.3 Downriver W4 Plant Potable (Onsite Well)

Zone II W3 Harriman Station 3.5 Upriver I

W5 liarriman Reservoir 10.1 Upriver Distance from Center of Vapor Container (KM)

Zone I W6 East Storm Drain 0.1 6*

W7 West Storm Drain 0.2 280*

W8 Sherman Spring 0.2 304' i

.y.-ms---

.s-~

=

T.

~*nx-

---M.

16 i

TABLE IV 4

Milk Sampling Locations l

Sampling and Analysis Frequency Monthly Location Distance from Plant (KM)

Azimuth Zone I.-

Mil Kingsley Fara j

Whitingham, VT 3.5 45' Zone II MI2 Mt. Williams Dairy Williamstown, MA 20.9 258' i

e

'i I

i l.

i i

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9 ww=

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e. m n.s.

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..m d

. O 17 TABLE V Fish and Aquatic Plant Sampling Locations Sampling and Analysis Frequency Three Times Per Year Distance from Location Discharge Point (KM)

Direction Zone I FAI Sherman Pond (Southern End Near Discharge Point) 0.2 N

l'A 2 Deerfield River (No. 4 Station Reservoir) 36.2 Downriver Zone II l'A3 llarriman Reservoir 10.0 Upriver l

1 1

f I

4 0

,.c

..a..-,,w.,m.

i 18' i

TABLE VI Mapic Syrup Sampling Locations Sampling and Analysis Frequency Annually - From Two Sta+. ions Location Distance from Plant (KM)

. Direction Zone 1 M4 Veber Farm Rowe, MA 4.0 S

I Zone II j.

M1 Coombs lacksonville, VT 9.1 NE d

M3 R. Ilicks Farm Charlemont, MA 8.0 SE M3 Truesdell's Sugar flouse CoIrain, MA 16.9 E

1 1

uy en mm ww aas,

3, y

^

e L

19 TABLE VII Soil and Vegetation Sampling Locations Sampling and Analysis Frequency Three Times Per Year Distance from Center Location

. Vapor Container (KM)

' Azimuth Zone I SV1 Plant Site 0.1 132' SV2 Dunbar Brook 3.2 216*

SV3 West Cemetery 3.2 150*

SV4 Ilarriman Station 3.2 359*

SV5 Field Laboratory Site 1.0 230*

SV6 Crossroad 3.5 83*

SV7 Whitingham Line 3.5 32*

SV8 Adams lil-Line 2.1 289*

Zone II SV9 Williamstown 22.2 265*

i r

[

=w

v

+ '

20 TABLli V111 River Sediment Sampling Lecations Sampling and Analysis Frequency Three Times Per Year Distance from Location Discharge Point (River KM)

Direction Zone I SE1 Sherman Pond (Condenser Outfall Area) 0.08 349' SE2 Sherman Pond (Above Sherman Dam) 0 18 320*

SE3 No. 5 Station Pond (Below Sherman Station Spillway) 0.55 Downriver SE4 No. 5 Station (Above No. 5 Canal 1:nt rance) 1.12 Downriver SES Deerfield River (Upstream of Rte. 2 Bridge at Mohawk Park) 21.5 Downriver SEb Deerfield River (Near Gar Chris Motel) 29.9 Downriver SE7 Deerfield River (No. 4 Station Pond) 36.2 Downriver SES Confluence of Deerfield River with North River 38.0 Downriver Zone II SE9 liarriman Station (from foot bridge) 3.4 Upriver SEIO liarriman Reservoir 10.1 Upriver Distance Upriver Of Confluence 1.ocation of North and Deerfield Rivers Direction Zone II Sell North River (Griswoldville Dam Pond Above) 5.1 Upriver SE12 North River (former Lyonsville Dam Site) 7.2 Upriver SE13 North River (West Branch) 6.3 tipriver SE14 North River (Griswoldville Dam, Pond Below) 4.8 Upriver

.,m.,.---

21

-TABLE IX TLD Monitorirg Sites Zone 1 4

Distance t' rom Center Station Number Location of Containment Bldg. -(M4)

Azimuth I

Furlon llouse 0.8 232*

2 Observation Booth 0.5 313' 3

Ford 11i11 Road 2.7 152' 4

lbrriman Station 3.2 359' 5

Monroo Bridge 1.3 240*

h

i. dsboro Road Barrier 1.3 355*

i 7

Whitingham Line 3.5

.32' 4

8 Monroe Ilill Barrier 1.8 182*

4 9

Dunbar Brook 3.2 216*

10 Cross Road 3.5 83*

11 Adams liigh Line 2.1 289*'

12 Readsboro, Vermont 5.5 344*

13 Restricted Area Fence

.08 255*

14 Restricted Area Fence

.11 300*

15 Rest ricted Area Fence

.08 345*

l 16 Restricted Area Fence

.13 30' 17 Restricted Area Fence

.14 70*

[

13 Restricted Area Fence

.14 115*

i~

19 Restricted Area Fence

.16 140*

20 Restricted Area Fence

.16 16L' l

21 Rest ricted Area Fence

.11 205*

Zonc 11 22 Williamstown Substation 22.2 265*

22 TABLE X Environmental Sample Detection Sensitivities by High Resolution Ce(Li) Camma Spectroscopy Water (1 liter)

Soil, Vegetation, Fish Filters Nuclide pCi/1 (400 gm) pci/gm pCi/ total filter Be 8E+01 2E-01 2E+01 K

2E+02 5E-01 5E+01 51 Cr 8E+01 2E-01 8E+01 54 Mn 8

2E-02 2

S8 Co 8

2E-02 2

Fe '

1E+01 4E-02 3

60 f

Co 8

2E-02 2

95 Zr 1E+01 4E-02 3

Ru 8

2E-02 2

Ru 8E+01 2E-01 8E+01 1

1 1E+01 3E-02 2

l 134 Cs 9

2E-02 2

l h

Ca 9

2E-02 2

1 j

Ba 3E+01 8E-02 6

l0 La 2E+01 4E-02 2E+01 "I

l41 Ce 2E+01 4 E-02 3

1 Ce 8E+01 2E-01 2E+01 Ra 6E+01 1E-01 1E+01 Th 1E+01 2E-02 1E+01 I-t 0

&S e

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ML20031C186

Text

SUMMARY

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