Text

Environ Radiation Monitoring Program Semiannual Rept 9, Jul-Dec 1976
	ML20238A965
Person / Time
Site:	Pilgrim
Issue date:	12/31/1976
From:	; BOSTON EDISON CO.
To:	;
Shared Package
ML20238A392	List: ML20238A389; ML20238A965;
References
	NUDOCS 8709010014
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l BECo. Ltr. #77-21 j BOSTON EDISON COMPANY Grwsuit Orrects soo Donstow Srecer DOSTON, M AESACHUSETTs 02199 l

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March 1, 1977 1

l Director '

1 Region I, Inspection and Enforcement U.S. Nuclear Regulatory Commission , l 631 Park Avenue King of Prussia, Pennsylvania 19406 l

Docket No. 50-293 i License No. DPR-35 I i

Semi Annual Report No. 9 f Environmental Radiation Monitoring Program j

Dear Sir:

In accordance with Pilgrim Station, Technical Specification 6.9.C.2, we are hereby submitting our ninth Semi-Annual Report. The incomplete portions of the report (i.e.,Section IV) will be provided in a supplemen- I tal report by July 30, 1977. A separate report covering Technical Specifi- +

cation 6.9.C.1 and entitled, " Pilgrim Station Radioactive Effluent Release o

Report" has been sent under separate cover.

Very truly yours, 4%*M #jf GT Carl Andognini l

1 Manager Nuclear Operations Department JIC/kc Enclosures (2) cc: Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D. C. 20555 (20 copies) i Director Office of Management Information i and Program Control U.S. Nuclear Regulatory Commission Washington, D. C. 20555 (2 copies) l 1

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BOSTON EDISON COMPANY PILGRIM NUCLEAR GENERATING STATION Environmental Radiation Monitoring Program 3

SEMIANNUAL REPORT NO. 9 JULY 1, 1976 THROUGH DECEMBER 31, 1976 Prepared By Joel I. Cehn <,'

Environmental Sciences Group Nuclear Engineering Department March 1977 Approved By: W ^^ -

i G. Jameg Davis, Group Leader i Environmental Sciences '

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i BOSTON EDISON COMPANY l

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< < I PILGRIM NUCLEAR GENERATING STATION Environmental Radiation Monitoring Program i

SEMIANNUAL REPORT NO. 9 ;

JULY 1, 1976 THROUGH DECEMBER 31, 1976 1 l

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Joel I. Cehn j Environmental Sciences Group i Nuclear Engineering Department ]

March 1977 Approved By:

G. Jame Davis, Group Leader Environm{ ental Sciences i

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TABLE OF CONTENTS i

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I. INTRODUCTION AND

SUMMARY

..................... l , j 3, l II. ~ DESCRIPTION OF MONITORING PROGRAM ............ 2 j

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~i , ' , III. MONITORINI: DATA LMD RESULTS .....;............ 3 A. Air Surveillance ......................... 3 B. External Gamma Exposure .................. 4 C. Milk ..................................... 4 D. Crops ...J................................. 5 i

E. Domestic.and Recreational Water .......... 5 F. Seawater ................................. 6 4

G. Marine Life .............................. 6 4

H. Marine Sediment .......................... 7 l I. Average and Maximum Values . . . . . . . . . . . . . . . . 7 l

l IV. CALCULATED RADIONUCLIDES CONCENTRATIONS ....... 9 APPENDIX A

SUMMARY

OF RADIOACTIVE EFFLUENTS ................ A-1 l

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i LIST OF ILLUSTRATIONS l Figure Page

1. Location of Offsite Monitoring Stations............ 10

2. Location of Onsite Monitoring Stations............. 11 )

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3. Aquatic and Terrestrial Surveillance Stations...... 12 1 3A. Mollusc, Algae and Sediment Sampling Stations...... 13 l 4. Radioactivity in Air Particulate - East J

Weymouth (EW)...................................... 14 l 4A. Autoradiograph of Air Particulate Filter from East Breakwater Station, 10/21/76 ............ 15

5. Radioactivity in Air Particulate - Overlook l Area (OA).......................................... 16 1

6. Concentrations of Strontium-90 and Cesium-137 in Milk (Plymouth)................................. 17 i P

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f LIST OF TABLES Table Page 1 Terrestrim. Sampling Schedule ...................... 18 ,

lA Marine Sampling Schedule ........................... 19 2 External Gamma Exposure Surveillance Stations (TLD) ..................................... 20 3 Air Particulate and Gaseous Radiciodine Surveillance Stations............................... 21 I

4 Terrestrial Sampling Locations...................... 22 i 5 Environmental Sample Analysis Parameters............ 23 5A Typical Detection Sensitivities Achievable ;

by High Resolution Ge(Li) Gamma Spectroscopic i Analysis of Environmental Samples................... 24 6 Air Particulate - Gross Beta Concentrations in Weekly Samples (pCi/m3) i July - Dec 1976....... 25 1

i 7 Air Perticulates - Gross Gamma Concentration l

1 in Monthly Composites (cpm /m3 x 10-3) ............ 26 7A Air Particulate - Gamme Isogope Concentration in Monthly Composites (pCi/m )...................... 27 7B Air Particulate - Strontium 89,90 Concentration in Quarterly Composites (pCi/m3 x 10-4)............. 28 i

8 Particulate Iodine-131 in Air Samples (pCi/m3)

July - December .................................... 29 8A Gaseous Iodine-131 in Air Samples (pCi/m3)

July - December .................................... 30 9 External Gamma Exposure Rates, Jul i 1976 (pR/hr)......................y - December

.................. 31 10 Radionuclides Concentrations in Milk (pCi/1) . . . . . . . . . 32 11 Radioactivity in Crops ............................. 33 12 Radioactivity in Domestic and Recreational Water.... 34 iv

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LIST OF TABLES - Continued Table Page l

13 Gamma Isotopic Concentrations in Domestic j and Recreational Water (pCi/L) Monthly ]

Composites - 1976.................................. 35 l 14 Radioactivity in Seawater July - Dec 1976.......... 36 15 Radioactivity in Marine Life, July-December 1976... 37 l 16 Radioactivity in Sediment.......................... 44 17 Average and Maximum Values for Each Medium j (pCi/gm) July - December 1976...................... 45 j i

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V

I. INTRODUCTION AND

SUMMARY

This report discusses the data. accumulated by the Environmental l

Monitoring Program during the period July 1, through December 31, {

1976.- i i

Pilgrim Station reactor power output was about 75% of capacity during July, August and September. The average capacity factor

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for October was about 70%, and for November and Dectmber it was j about 80%.

The Environmental Radiation Monitoring Program was performed durirg the reporting period as required by the Nuclear Regulatory Commis-l sion. The most notable event was the detection of weapons test !

l fallout from the Chinese tests of September 26 and November 17. l Isotopes detected in terrestrial media were I-131, Mn-54, Zr/Nb-95, 1 Ba/La-140 and Ru-103, 106. I-131 was detected in milk at 51 pCi/1. I Fallout nuclides detected in marine media included Mn-54, Zr/Nb-95, Ru-103, La-140 and Ce-141, 144.

Plant related radioactivity was detected in marine algae, sediments and finfish. The highest level detected was 2.1+ .2 pCi Co-60 per

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gram Irish Moss.

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II. DESCRIPTION OF MONITORING PROGRAM -

The Environmental Radiation Monitoring Program is being performed l

in accordance with the requirements specified in the Pilgrim Facility !

Operating License (DPR-35). Summaries of the sampled media, sampling i locations, frequences of collection, analyses and detection sensi-tivities are given in Tables 1 through 5A. Sampling locations are shown in Figures 1, 2, 3 and 3A. A more detailed program descrip-tion including analytical and radiochemical techniques is contained in a separate report entitled, " Environmental Radiation Monitoring Program, Program Description and Procedures, January, 1976."

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III. MONITORING DATA AND RESULTS This section presents the results of radiological analyses of i

samples taken during the reporting period. Analyses were per-formed either by Interex, Corp. or Teledyne, Isotopes, except as noted. Counting erro; s are calculated at the 95% confidence level, l that is, two times tite standard deviation of the count. Reported ;

"less than" values are generally three times the standard deviation '

of the background count. The exceptions are "less than" values reported for milk, freshwater, crops, finfish, and seawater, which are two standard deviations of the background count.

Incomplete data is missing from the report tables and will be re-ported in a later report.

A. Air Surveillance Weekly air surveillance filters were analyzed for gross beta ac-tivity (after 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> decay) and radiciodine activity. The results are presented in Tables 6, 8 and 8A. Monthly gross gamma, and quarterly gamma isotopic and Sr-90 activities are presented in Tables 7, 7A and 7B respectively. The data clearly shows the presence of fallout from the C'hinese nuclear weapons tests of September 26 and November 17, 1976. The particulate filter with the highest activity was from the East Breakwater station for the week of October 21. Gamma spectral analysis showed that the ac-tivity was due to Ru/Rh-106. A radiograph of the filter (see 3

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l Figure 4A) showe'd the activity to be contained in one large particle, i Since all Pilgrim Station contaminated gaseous effluents are filtered to remove particulate, and since Ru/Rh-106 did not appear in the gaseous effluent samples, it is reasonable to conclude that the j Ru/Rh-106 detected is a weapons fallout particulate. i i

Long-term trends in airborne radioactivity are shown in Figures 1 4 and 5.

B. External Gamma Exposure External gamma exposure rates at 22 onsite and 17 offsite locations are reported in Table 9. The measurements were made with the Tele-dyne Radi-guard CaSO4 (Dy) dosimeters and 8300 reader by Boston Edison personnel. Monthly average offsite (background) exposure I rates ranged from 6.7 gR/hr to 9.8 #R/hr. Elevated onsite ex-posure rates were due to direct radiation from steam in the plant I turbine, and other direct radiation sources.

C. Milk Milk was sampled from two dairy locations, from a store in Plymouth, l

and, for two months, from the Plimoth Plantation. The routine l

samples were analyzed monthly for Cs-137, Sr-90, Ba/La-140 and I-131. The results obtained during the reporting period are pre-sented in Table 10. Iodine-131 from the weapons testing mentioned earlier is present in all October samples. The highest level detected is 1/6th the federal limit for I-131 in drinking water.

Radioactivity returned to essentially background levels in November.

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i Data not reported in the previous Semiannual Report are included in Table 10. Long-term variations in radiocesium and radiostrontium levels are shown in Figure 6.

D. Crops Samples of cranberries, hay, lettuce and potatoes were collected during the reporting period. Edible portions were analyzed for gross beta, radiostrontium, and gamma emitters (see Table 11).

Cs-137 activity was detected in cranberries at all locations, in-cluding the control. Other man-made gamma emitters (I-131, Zr-95, Ru-103, and Ba/La-140) were detected in the only sample (cranberries 10/12) taken after the effects of the nuclear weapon test of September 26 were observed in New England. These nuclides were also detected in air particulate (see Table 7A). None of the detected levels of radioactivity are considered hazardous to public 1

I health.

E. Domestic and Recreational Water Monthly composites of weekly water samples were analyzed for gross radioactivity, and the isotopes H-3, Sr-90, and I-131. The results are shown in Table 12. Gross gamma levels in December were elevated at all locations including the control (Great Pond). The results of gamma spectral analyses, required quarterly, are presented in Table 13. Trace levels of Cs-137 were detected at several locations including the control (Great Pond).

The April " South Pond" sample from the previous report was checked for Cs-137 activity radiochemically, in order to check the gamma 5

l spectral analysis result of 6 1 3 pCi/1. The radiochemical result was 2.4 i .6 pCi/1. Based on this result, the detected level of Cs-137 is within the rar. .' of the background value for that month of 4 1 3 pCi/1, attributable to fallout from previous weapons tests, i

and is fell below the federal regulation for drinking water (20,000 pCi/1).

F. Seawater Monthly samples were taken from the intake channel, discharge canal, and a control location 7.5 miles NNW of the station. These were l

analyzed for fractional gross beta (explained in Table 14), gross gamma, tritium, and iodine-131. The results of these analyses and of quarterly analyses of intake and discharge seawater for specific radioisotopes are presented in Table 14.

The elevated Fraction I activity in the November control sample (Powder Point), was due to both weapons testing fallout and the very large amount of suspended particulate in that particular l l

l sample. No difference in the radioactivity of Pilgrim intake sea-water and discharge seawater can be inferred from the data.

G. Marine Life Finfish, shellfish and algae were sampled during the reporting period. The results of radiostrontium and gamma spectral analyses are presented in Table 15. The results of analyses of samples from the previous reporting period, not fully reported in Semi-annual Report #8, are included in Table 15. Trace amounts of plant related radioactivity (Mn-54, Co-60, Zn-65, Cs-137) were detectc.

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in algae in the vicinity of the site. Algae sampled from the con-trol location (9 mi SSE) contained background levels of radio-activity. The October Irish moss samples contained fallout from

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the September nuclear weapons testing; namely, Mn-54, Zr-95, Ru-103, Ce-141, Ce-144, and La-140. l Weapons fallout isotopes were also detected in October in shellfish.

i Cs-137 was detected in finfish at levels ranging from .02 to .11-I pCi/gm. Background levels for Cs-137 (fallout produced) have been reported by the EPA

to be .0291 005 pCi/g for bottom feeders and

.0381 006 pCi/g for opportunists. After correcting for background, only two samples can be said to possibly contain plant related Cs-137 during the reporting period (cod 6/28, cod 5/12).

Cs-137 was also detected in lobster, however, background data is not available for this species. Data will be obtained during the next reporting period to determine the amount of plant related radiocesium in these samples.

Weights given in Table 15 are wet weights except for algae, which are weighed and analysed dry.

H. Marine Sediment Results of analyses of marine bottom sediments in the vicinity of the plant are presented in Table 16. Sediment is sampled with a coring device to approximately 9 in. depth, in the intertidal zone.

O EPA-520/5-76-003 Radiological Surveillance Studies at the Oyster Creek BWR Nuclear Generating Station, 1976.

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Co-60 was present in trace amounts at the on-site location. Cs-137 ,

I was present at nearly all locations, including the most distant 1 (7.5 miles NNW). A review of the 1976 data shows that the Cs-137 detected offsite is fallout related and not plant related. Two factors point to this conclusion: (1) Cs-137 levels detected at i

distant locations are either higher (high clay content sediments)- !

or are comparable to those detected at Rocky' Point (see averages below). (2) Cs-134, the reactor " tag" isotope was not detected at any location other than Rocky Point.

Cs-137 in Sediments - pCi/gm 1976 Averages (No. of samples averaged) l Cs-137 Background ( > 3 mi . from plant) Rocky Point l

High Clay other Cs-137 Cs-134 0.221 02 (3) 0.0511 009 (8) 0.0671 014 (4) 0.071 03 (1) l 1

I. Average and Maximum Values 1 1

Average and maximum values were calculated for selected analyses of all media. The results are presented in Table 17 for both indicator and control locations. The control locations used can be identified in TabJes 6 through 16.

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'l IV. CALCULATED RADIONUCLIDES CONCENTRATIONS Environmental concentrations of isotopes released by the plant during the reporting period are being calculated and compared to observed concentrations. The results were not complete as of the I i

report date and will be transmitted in a later report. l l

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Figure 1. Location of Offsite Monitoring Stations 10

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6 PROPERTY LINE (H) 18 ROCKY HILL ROAD (WR) 7 PUBLIC PARKING AREA (PA) 19 PROPERTY LINE U) 8 PEDESTRIAN BRIDGE (PB) 20 PROPERTY LINE (K) 9 OVERLOOK AHEA (OA) 21 ROCKY HILL ROAD (ER) 10 E AST BRE AKWATER (EB) 22 PROPERTY LINE (L) 11 PROPERTY LINE (C) 23 WAREHOUSE (WS) 12 PROPERTY LINE (HB) 24 PROPERTY LINE (PL) s O DOSIMETER (TLDn A AIR PARTICUL ATES AND DOSIMETERS (TLD)

Figure 2. Location of Onsite Monitoring Stations l

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$ PRISCILLA BE ACH (PRB) 15 COL.LEGE POND (CP) 6 WHITE HORSE BEACH (WEH) 16 BRIDGEWATER STATE F ARM (BF) 7 BE AVER DAM HOAD BOG (854) 17 GREAT POND PUMPlNG STATION (GP) -

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1 TABLE 1 l TERRESTRIAL SAMPLING SCHEDULE I

Number of Medium Frequency Sample Size Locations

Domestic Monthly Composites 4 liters 4 Water of Weekly Samples !

1 Recreation Monthly Composite 4 liters 1 j Water of Weekly Samples J All Particulate 3 Weekly 10,000 ft 11 t and Gaseous Iodine air Gamma Radiation Monthly 4 TLD read- 39 outs per 4 location Lettuce Annually 1,000 grams 3 or Cabbage (June or July)

Corn, Potatoes i Annually 1,000 grams 2 I and Hay (Aug. or Sept.)

Milk Monthly 2 liters 2 Cranberries Annually 1,000 grams 6 (Sept. or Oct.)

Locations are given in Tables 2, 3 and 4.

i 18

7 j

l TABLE lA MARINE SAMPLING SCHEDULE Medium Frequency Sample Size Quantity Irish Moss Alternate months 1 liter dried 1 from each (Chondrus crispus) location *

]

i Blue Mussel Monthly 1 liter 1 from each -

(Mytulis edulis) April-September location * )

Softshell'elam Quarterly, 1 liter 1 from each '

(Mya arenaria) October-March location * .

Quahog Monthly - as 1 liter 1 from each (Mercenaria) available location * ,

1 Lobster Monthly - as 450 grams 1 from each (Homarus americanus) available location

l Sediment Quarterly Vertical core 1 from each to 25 cm location

Finfish Groups I & II** Monthly-as available 400 grams 3 from each group Groups III & IV Quarterly 400 grams 5 from each group Seawater Monthly 4 liters 3 (IC,DC,PP!***

Quarterly 15 liters 2 (IC,DC)

June, July, August 4 liters 2 (beaches)

Sampling locations are shown in Figure 3A. Finfish are from station vicinity.

- Greupings are shown below:

1 I. Dottom Oriented II. Near Bottom III. Anadromous IV. Coastal Migratory Distribution l Winter flounder Tautog Alewife Bluefish i

Yellowtail flounder Cunner Rainbow smelt Atlantic herring Atlantic cod Striped bass Atlantic menhaden Pollock Atlantic mackerel Hakes

- - IC = intake canal. DC = discharge canal. PP = Powder Point, Duxbury.

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Domestic Water South Pond 4.75 miles WSW 14 Manomet Well 2.75 miles SSE 11 Lout Pond 4.75 miles W 12 Great Pond

25 miles WNW 17 Recreation Water College Pond 6.5 miles SW 15

Air Particulate Table 2-3 Table 2-3 Figures 1 and 2 Gamma Radiation Table 2-4 Table 2-4 Figures 1 and 2 Precipitation South Pond 4.75 miles WSW 14 Lettuce & Cabbage Plymouth County Farm 3.5 miles W 13 Bridgewater State Farm

20 miles W 16 Karbolt l' arm 2.0 miles SSE 9 Hay & Potatoes Plymouth County Farm 3.5 miles W 13 Bridgewater State Farm

20 miles W 16 Corn Plymouth County Farm 3.5 miles W 13 Robbins Farm 2.0 miles SSE 9 Milk Plymouth County Farm 3.5 miles W 13 Peaceful Meadows Farm

21 miles NW 19 Cranberries Long Pond Road Bog 4.25 miles SW 8 Deaver Dam Road Dog 2.0 miles S 7 Manomet Pt. Rd. Bog 2.6 miles SE 8 (Figure 1)

Bartlett Rd. Bog 2.75 miles SSE-S 10 Hall's Bog 0.6 miles SE 12 (Figure 2)

Pine St. Dog

17 miles WNW 18

Control locatTons.

22

TABLE 5 ENVIRONMENTAL SAMPLE ANALYSIS PARAMETERS Sample Type III Nominal and Number Analysis Frequency Detection Limit Aliquot

~3 pCi/m 3 Air Particulate (7) Gross beta Weekly 4 x 10 10,000 ft 3 Gross gamma Monthly 2 x 10-3 cpm /m3(b) 10,080 ft 3 131 2 x 10-2 pegj,3 10,080 ft 3 I Weekly Ganeous Iodine (7) 131 g Weekly 4 x 10 -2 pCi/m 3 10,080 ft 3 Nonsaline Water (4) Gross beta Monthly 1 pCi/ liter 1,000 ml Gross gamma Monthly 5 cpm / liter ICI 4,000 ml Gamma spectrum (e) (d) 4,000 ml 90 Sr Monthly 0.5 pCi/ liter 1,000 ml 3

g Monthly 2.5 pCi/mi 4 ml Crops and Gross beta Each Sample 0.2 pCi/g 20 g Marine Life Cross gamma Each Sample 0.01 epm /g ICI 1,000 g Gamma spectrum Each Sample (d) 1,000 g 90 Sr Each Sample 0.005 pCi/g 100 g Seawater (3) Fractional gross m beta Monthly 5 pCi/ liter 500 ml Gross gamma Monthly 5 epm / liter (c) 4,000 ml Gamma spectrum (e) (d) 4,000 ml H Quarterly 2.5 pCi/ml 4 ml 90 Sr Quarterly 0.5 pCi/ liter 15,000 ml 137 Cs Quarterly 0.05 pCi/ liter 15,000 ml 54 Mn Quarterly 5 pC1/ liter 1,000 ml 68 co Quarterly 5 pCi/ liter 1,000 ml 60 Co Quarterly 5 pCi/ liter 1,000 ml 65 Zn Quarterly 5 pCi/ liter 1,000 ml 131 I Quarterly 5 pCi/ liter 1,000 ml Milk (2) 90 Sr Monthly 2 pCi/ liter 1,000 ml 137 Cs Monthly 'l pCi/ liter 1,000 ml 140 Ba Monthly 5 pC1/ liter 1,000 ml 131 I Monthly 2 pCi/ liter 2,000 ml Dottom Sediment (1) Gross beta Semiannually 2 pCi/g 1g Camma Spectrum semiannually (d) 1,000 g 90 Sr semiannually 0.005 pCi/g 100 g Background Gamma exposure Monthly 1 uR/hr 1-month Radiation (19) ra te (a) exposure NOTE: Provided by Interex Corp., Natick, Massachusetts TO Measured with thermoluminescent dosimeter.

(b) In the counter used, 1 cpm corresponds to 2.2 pCi o 137 Co.

(c) In the counter used, Icpmcorrespondsto9pCiof{37 Cs.

(d) Ge(L1) deter: tion sensitivities are given in Table SA.

(e) Selective gamma analyses are performed based on gross gamma results, with at least one gamma spectrum analysis each quarter.

(f) Numbers in parenthesis are technical specification requirementer actual number of samples is usually greater than the minimum.

23

TABLE 5A TYPICAL DETECTION SENSITIVITIES ACHIEVABLE BY HIGH RESOLUTION ge(Li) GAMMA SPECTROSCOPIC ANALYSIS OF ENVIRONMENTAL SAMPLES Water (1 liter) Solids Filters Nuclide pCi/I (4 00 gm) pCi/gm pCi/ total filter Be-7 8E+01 2E-01 2E-01 K-40 2E+02 5E=01 5E+01 Cr-51 8E+01 2E-01 8E+01 Mn-54 8 2E-02 2 Co-59 8 2E-02 2 Fe-59 lE+01 4E-02 3 Co-60 8 2E-02 2 l Zr-95 1E+01 4E-02 3 Ru-103 8 2E-02 2 Ru-106 -

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TABLE 9 EXTERNAL GAMMA EXPOSURE RATES, JULY - DECEMBER 1976 (pR/hr) (a)

Onsite Monitoring Locations July Aug Sep Oct Nov Dec Overlook Area (OA) 28.6 +2.9 28.1 +2.6 30.9 +3.5 29.8 +3.7 30.0 +3.6 35.0 +3.7 'I East Dreakwater (EB) 10.3 T1.2 8.7 70.9 8.7 T1.1 10.2 71.9 16.8 T1.6 12.1 72.1 1 Emerson Road (EM) 7.6 70.9 7.2 71.1 7.0 70.8 7.6 71.1 9,0 70.8 7.8 70.8 Microwave Tower (MT) 7.7 70.9 7.9 71.0 8.0 70.9 8.1 71.1 10.4 T1.1 9.4 71.5 i Public Parking Area (PA) 10.9 70.R 11.3 71.8 12.3 71.1 12.5 T1.9 13.1 T2.7 11.6 T1.3 I Pedestrian Bridge (PD) 19.7 73.1 15.9 72.4 16.5'T3.0 19.0 T2.4 22.6 T2.5 19.9 72.1 I White Horse Road (WH) 7.4 T1.0 7.8 T1.2 8.0 71.1 8.2 71.5 9.5 T1.9 8.2 71.4 ;

l' Rocky Hill Road (A) 9.3 T1.4 9.4 T1.1 10.0 71.8 9.8 T1.1 12.6 72.6 9.9 71.3 !

Property Line (D) 10.7 T1.5 10.6 70.9 11.4 71.7' 10.3 71.1 10.4 T1.5 9.2 T1.2 Property Line (C) 9.6 T1.5 9.4 70.9 10.0 T1.4 -11.5 T1.2 13.1 T1.0 10.4 71.1 1 Property Line (D) 10.6 71.6 11.2 71.1 (5) 12.4 71.5 10.7 T1.1 10.3 T1.1 Property Line (E) 8.5 T1.0 8.4 T1.5 8.0 +0.9 9.6 T1.5 10.3 T1.9 7.7 T1.2 j Property Line (P) 10.4 70.9 11.2 71.7 11.2 71.3 11.3 71.3 13.1 T1.7 10.5 T1.5 Property Line (G) 10.9 71.5 10.4 71.1 10.6 T1.0 12.0 71.1 12.9 T1.2 9.5 T1.4 J Property Line (H) 10.9 71.2 11.6 71.4 13.3 73.3 (5) 11.7 71.0 '11.7 T3.5 l Property Line (1) 10.1 T2.4 10.2 71.2 9.8 71.1 10.4 +1.0 9.7 71.1 9.2 II.6 'I Property Line (J) 7.7 70.9 8.3 71.2 7.8 T1.0 8.4 T1.1 8.1 T1.1 7.4 T1.5 #

Property Line (K) 7.9 70.9 6.7 70.8(c) 8.0 70.8 6.7 70.8(c) 7.2 70.4 7.4 71.0 Property Line (L) 9.9 70.9 10.3 T1.1 9.9 70.9 11.3 T1.0 15.9 T1.5 11.8 72.8 Property Line (PL) 10.2 T1.0 10.3 70.8 10.0 71.0 11.1 71,4 8.1 T1.0 10.7 72.7 Warehouse (WS) 20.8 72.0 19.2 72,7 22.9 T2.7 22.6 72.9 20.3 72.5 18.3 72.2 Property Line (HD) 10.2 {l.6 9.9 {l.3 8.6 {1.1 11.1 {1.2 8.3[1.0 10.7 12.2 A'verage Onsite 11.4 +0.7 11.1 +0.6 11.6 +0.7 12.1 +0.7 12.9 +0.8 11.8 +0.8 Offaite Monitoring Locations College Pond (CP) 5.9 +0.6 4.6 +0.4 5.4 +0.8 4.6 +0.4 10.0 +1.5 4.6 +0.4 Cleft Rock Area (CR) 6.3 T0.8 5.3 70.5 6.0 T1.1 5.7 70.9 10.6 T1.9 6.0 T2.2 Sagamore (CS) 7.1 T0.6 7.1 T1.0 (E) 7.5 T1.4 10.2 T1.6 7.0 T1.5 i Rocky Hill Rd. East (CR) 6.8 70.9 6.7 T0.7 6.4 +1.2 6.3 T0.6 11.0 T0.9 6.9 70.8 i East Weymouth (EW) 6.9 T0.7 6.1 70.6 6.3 70.7 6.0 TO.8 10.5 T1.0 6.8 70.8 Kingston (KS) 5.7 70.7 6.4 70.9 5.4 70.6 5.6 T1.3 8.4 T1.3 6.0 T1.3 i Manomet IMB) 7.5 T0.8 6.4 70.7 6.4 70.8 6.6 70.7 8.9 70.8 5.9 T0.8 l Manomet (ME) 7.5 70.6 7.5 T1.0 7.4 70.5 8.0 T1.0 11.4 T2.3 8.4 T1.0 Manomet (MP) 7.3 T1.1 6.4 71.0 6.4 T1.6 8.0 71.2 10.5 T2.0 6.9 71.8 Manomet Substation (MS) 7.8 70.8 8.1 70.9 7.2 70.9 8.3 71.0 10.4 T1.0 8.2 70.7 North Plymouth (NP) 7.9 71.2 7.9 70.8 6.9 70.8 7.5 T0.8 9.9 T2.6 7.9 70.8 Plymouth Center (PC) 6.2 70.7 6.2 70.9 5.2 71.3 6.5 70.9 7.3 70.6 6.1 71.0 Plymouth Airport (SA) 6.6 70.8 6.2 70.6 5.7 70.7 6.9 70.8 7.8 T1.3 7.7 71.6 South Plymouth (SP) 8.7 T1.4 6.9 TO.9 6.6 70.8 7.9 T1.1 10.7 72.4 '8.4 T2.4 Duxbuty (SS) 8.4 72.5 5.9 T0.7 7.0 71.7 6.2 70.6 8.3 T1.7 7.0 70.8 Rocky Hill Rd. West (WR) 10.0 T1.5 8.2 T1.6 9.8 T3.4 9.9 T1.9 11.0 T1.2 9.6 T2.0 Bayshore Drive (BD) (6) 8.4 {0.7 9.5 {1.6 9.5 {0.6 10.1 {l.1 9.2 [0.8 Average Offsite 7.3 +0.5 6.7 +0.4 6.7 +0.7 7.1 +0.5 9.8 +0.8 7.2 +0.6 (a) Measured with CaSO4 (Dy) dosimeters.

(b) Dosimeter stolen.

(c) Exposure rates calculated from a three month exposure (Aug - Oct) of 7.1 pR/hr and Sept exposure of 8.0 pR/hr. This was due to the August dosimeter being accidently exposed for three months and the October dosimeter being stolen.

31 i

i

_______-__a

I TABLE 10 RADIONUCLIDES CONCENTRATIONS IN MILK (pCi/1)

Collection Period Plymouth Analysis (1976) (County Farm) Whitman

Local Store I Cs-137 July 6.0 1.0 10.7 0. 7. 7.8 10.8 August 5.7 0.7 7.8 0.8 6.3 0.9 September 9.6 0.7 12.9 1.0 11.2 1.6 October 10.1 1.1 5.6 1.0 5.5 1.1 November 21.5 1.1 7.2 0.6 5.1 0.5 December 8.6 0.8 3.5 0.6 2.2 0.4 Sr-90 June 7.5 0.4 5.5 0.5 5.9 0.4 July 3.8 i0.3 4.0 i0.4 4.4 1.1- j August 6.1 0.6 6.4 i0.6 5.3 0.7- i September 7.2 0.5 5.1 0.4 6.2 0.5 October 4.3 0.4 3.4 0.3 3.4 0.5 I November 3.8 0.5 3.4 0.4 5.2 10.7 December 4.8 +0.5 5.0 +0.5 I-131 July <0.7 <0.5 <0.4 August <0.4 <0.7 <0.4 l September <0.2 <0.2 <0.2

<0.2**

October 19.8 0.6 51.3 1.0 11.2 0.4 26.1 0.6**

November <0.2 <0.2 0.3 0.2 December <0.5 <0.4 <0.2 Ba/La-140 July 0.9 0.4 1.9 0.7 1.1 t0.9 August 2.5 11.0 3.5 1.0 1.4 1.0 September <l.0 <1.1 <0.6 October 2.3 1.1 2.5 1.4 2.1 1.2 November 1.4 0.8 <0.7 1.8 0.8 December <2 3 3 <4 l

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TABIAS 12 !

RADIOACTIVITY IN DOMESTIC AND RECREATIONAL WATER i

Collection Great Little College Lout Pond Manomet Analysin Date (1976) Pond (a ) South Pond Pond __ Well Well , j Gross Beta July 4.1 10.5 1.1 20.3 3.0 10.7 <0.3 0.7 20.3 (pC1/1) August 1.5 10.7 3.7 10.7 1.5 to.6 <0.6 0.9 to.6 September 3.9 t0.6 1.8 to.4 2.3 10.6 0.9 10.4 0.5 10.4 October 5.1 to.6 10.1 20.8 4.4 10.5 1.2 !0.5 <0.4 l November 6.3 20.3 5.8 20.3 2.9 20.2 0.8 20.2 0.7 20.4 i December 4.6 10.5 1.1 20.6 0.7 20.4 0.7 10.3 0.5 20.3 i

Gross Camma July <0.4 <0.4 <0.4 <0.4 <0.4 j fcom/1) August <0.9 <0.9 1.2 10.8 1.5 20.9 3 21 September <0.9 <0.9 (0.9 4.6 21.1 <1.2 October <0.4 <0.4 <0.4 <0.4 1.0 10.4 November <1.0 <0.9 <1.0 4.1 11.0 3.8 11.0 December 2.3 11.0 8.7 11.0 11.2 11.0 3.3 20.4 1.2 10.4 Strontium-90 July 0.4 20.2 0.3 20.2 0.2 10.2 <0.15 <0.14 !

(PC1/1) August 0.7 10.2 1.5 to.2 0.45 10.15 <0.3 <0.2 '

September 1.2 to.2 0.89 10.15 0.6 10.2 <0.3 0.4 10.3 October 1.0 10.2 1.25 20.15 0.17 20.12 0.2020.10 <0.12 November 0.5 20.4 1.2 20.3 0.3 10.3 <0.3 <0.2 December 0.3 10.3 <0.4 (0.14 Tritium July <50 150 150 150 260 150 50 190 250 (pC1/1) August <50 <60 60 160 100 260 <50 September 80 250 110 150 80 250 130 280 <80 october 50 150 90 260 70 160 <80 180 180 November 170 tSO 230 150 93 250 50 250 230 250 December 130 40 80 140 100 240 140 240 110 140 Iodine-131 July <0.2 <0.2 <0.2 <0.3 <0.6 August (0.3 <0.2 <0.3 <0.6 0.6 20.6 September <1,7 <1.5 <2.3 <0.8 <0.6 October <0.6 <0.4 1.2 10.8 0.3 20.3 <0.3 November (0.6 3 22 <2.3 <0.2 <0.7 December <l.2 <1.1 <3 <2 <l.5 (a) Control location 34

J TABLE 13 GAMMA ISOTOPIC CONCENTRATIONS IN DOMESTIC AND '

AND RECREATIONAL WATER (a) (pCi/L)

MONTHLY COMPOSITES - 1976 I

creat Little College Lout Manomet Period (1976) Analysis Pond South Pond Pond Pond Well Well

'l I July Cr-137 4 24 <5 <4 3 14 <4 Cs-134 c5 <S <4 <5 <4 Mn-54 <4 <4 <4 <4 <4 a Co-58 <5 <4 <4 <5 <4 Co-60 <4 <4 <4 <4 <4 i Fe-59 <10 <10 ell (11 <ll i zn-65 <9 c9 <7 (9 <8

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l I-131 <6 <20 <9 <14 i K-40 <70 ( 70 <50 <70 <50 !

Ra-226 <10 <10 <B 18 110 <9 Th-228 <7 <7 <6 <7 (7 n Analysis Date 8/2/76 8/3/76 8/18/76 8/11/76 8/17/76 October Cs-137 <4 <4 <4 <4 'S ?4 Cs-134 (4 <4 <4 (4 <4 Mn-54 <4 <4 <4 <4 <4 Co-58 <4 <4 <4 <5' <5 Co-60 <4 c4 <4 <4 <4 Fe-59 <9 <9 <10 <l2 <12 Zn-65 <7 <7 (7 <8 <8 1*131 <7 <7 (B <30 <30 K-40 <50 <60 <60 (60 (60 Ra-226 (9 <9 <9 (8 <9 Th-228 <6 <7 <6 (6 <6 Analysis Date 11/3/76 11/4/76 11/3/76 11/24/76 11/24/76 (a) Results of Ge(Li) spectrometry, required quarterly.

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TATILE 17 AVERAGE AND MAXIMUM VALUES FOR EACH MEDIUM (pCi/gm) JULY-DECEMBER 1976 Media & Indicator Stations Control Stations Analysis Average Maximum Average Error Average Maximum Average Error Air Particulate Gross Deta 0.098 2.59 0.000 0.093 0.56 0.008 Sediment Gross Data 15 19 2 23 23 2 Milk Co-137 8,3 21.5 0.9 8.8 12.9 0.8 Sr-90 5.3 7.5 0.6 4.5 6.4 0.4 I-131 11.5 26.1 0.4 8.6 51.3 0.5 l Ba/La-140 1.7 2.5 0.9 2.6 3.5 1.0 ;

i Corn Gross Deta 3.0 3.4 0.1 2.91 2.91 0.07 Cranberries Gross Beta 0.91 0.99 0.03 1.30 1.30 0.06 Ilay Gross Deta 16.2 16.2 0.4 9.4 9.4 0.2 .

Lettuce Gross Deta 1.26 1.86 0.04 (a)

Rec. & Dom. ,

i Water Gross Bota(b) 1.9 10.1 0.5 4.3 6.3 0.5 Seawater Gross Gamma (c) 2.1 7.0 1.5 2.6 4.0 1.5 i i

Mussels Gross Deta 1.6 2.6 0.6 1.4 2.3 0.6 Clams (d)

Gross Beta 1.5 1.8 0.1 1.3 1.3 0.1 Irish Moss Gross Deta 46 55 2 43 44 2 Rockweed Gross Beta 7.3 23.2 0.3 (a)

Finfish Group I Gross Beta 5.2 8.5 0.2 (a)

Group II Gross heta 3.8 7.9 0.2 (a)

Group Ill Gross Beta 2.87 6.10 0.13 (a)

Group IV Gross Deta 3.8 7.3 0.2 (a)

(a) No samples required.

(b) Units are pC1/2 (c) Units are epm /t (d) Samples taken 8/26 through 8/31 are not included. Results of gross beta analysis are being checked.

C 45

APPENDIX A

SUMMARY

OF RADIOACTIVE EFFLUENTS A summary of Pilgrim Station radioactive effluents is presented in' Tables A-1 and A-2. Table A-1 summarizes liquids released to Cape Code Bay via the discharge canal. Table A-2 summarizes the effluents reler.aed to the atmosphere through the main stack and through the reactor building vent.

A-1

TABLE A-1 l

SEMI-ANNUAL

SUMMARY

OF RADIOACTIVE LIQUID EFFLUENTS f 3

1976 Quarter 3 Quarter 4,

'1 Cross Radioactivity j (Not including tritium, gr ses, alpha) 1 Tot.al Released (Ci) 3.25E-1 5.70E-2 Avg. Conc. Released (uci/ml) 9.14E-8 2.07E-8 Tritium Total Released (C1) 1.01E+0 1.92E-3 !

Avg. Conc. Released (uC1/ml) 2.83E-7 6.98E-10 j l

Cross Alpha Radioactivity (C1) 2.79E-5 3.76E-5 i Volume of Liquid Waste to j l

Discharge Canal (liters) 1.93E+5 3.51E+4 j Volume of Dilution Water (liters) 3.55E+9 2.75E+9 Nuclides Released (Ci) 1 Strontium-89 4.12E-4 4.28E-4 Strontium-90 9.88E-4 3.94E-4~ -

Cesium-134 9.19E-3 3.44E-3 Cesium-137 2.52E-2 1.04E-2 Iodine-131 6.58E-5 3.46E-4 Iodine-133 5.81E-5 2.55E-4 Cobalt-58 8.06E-4 2.54E-4 )

Cobalt-60 3.65E-2 1.25E-(. l Iron-55 8.76E-2 7.36E ,3J j Iron-59 2.04E-4 1.66E-4. ;

Zine-65 1.11E-3 3.18E-4 l Manganese-54 1.16E-2 3.22E-3 l Chromium-51 1.24E-3 6.07E-4 Zirconium / Niobium-95 1.03E-3 2.96E-4 Molybdenum-99/ Technetium-99m 1.06E-4 5.02E-4 Xenon-133 .1.32E-4 2.00E-5 l Xenon-135 1.34E-4 NDA Barium / Lanthanum-140 7.60E-4 9.92E-4 Cerium-141 5.05E-5 1.83E-4 Cerium-144 2.44E-3 6.55E-4 Silver-110m NDA 4.56E-6 Unidentified 1.45E-1 1.40E-2 NDA = No detectable activity A-2 ..

l l

TABLE A-2 SEMI-ANNUAL

SUMMARY

OF RADI0 ACTIVE GASEOUS' EFFLUENTS 1976 I

Quarter 3 Quarter 4 Gross Radioactivity Total Released (C1) 6.37E+4 8.77E+4 Avg. Release Rate (uC1/sec) 8.01E+3 1.10E+4 Tritium Total Released (Ci) 5.51E+0 1.91E+1 Avg. Release Rate (uCi/sec) 6.93E-1 2.40E+0-Cross Alpha Radioactivity '(C1)' 1.71E-6 3.10E-7 Isotopes Released (all Curies)

Halogens-Main Stack i

Iodine-131 2.07E-2 1.97E-2' Iodine-133 6.97E-2 4.63E-2 i Iodine-135 9.26E-2 6.66E-2 i Halogens-Reactor Bldg. Vent ,

1 Iodine-131 3.25E-2 5.07E-2 Iodine-133 1.03E-1 2.38E-1 Iodine-135 1.56E-1 5.30E-1 ,

i Particulate-Main Stack 1

Strontium-89 2.71E-2 3.30E-2 Strontium-90 7.21E-5 9.92E-5 Cesium-134 NDA 9.40E-8 Cesium-137 7.03E-4 7.85E-4 Ilarium/ Lanthanum-140 5.35E-2 4.42E-2 Manganese-54 3.01E-5 5.18E-6 l l

Cobalt-60 9.12E-5 7.17E-5 Cerium-141 3.05E-5 6.27E-5 Cerium-144 2.78E-5 5.42E-5 i

i A-3 i

mm__ _ _ _ _. _ . __... __.._.m.

TABLE-A2 (CONT.)-

Quarter 3 Quarter 4 Isotopes Released (all Curies)

Particulate - Reactor Bldg. Vent Strontium-89 1.56E-3 -9.16E-2 Strontium-90 5.89E-6 1.39E-4 Cesium-134 1.22E-5 2.15E-5 Cesium-137 4.60E-5 1.99E-4 Barium / Lanthanum-140 3.26E-3 1.57E-2 Manganese-54 3.67E-5 5.21E-5 Cobalt-58 4.64E-6 NDA Cobalt-60 1.24E-4 5.38E-4 Iron-59 3.44E-6 NDA Zinc-65 NDA 4.76E-6 Zirconium / Niobium-95 3.52E-6 3.47E-6 !

Cerium-141 3.32E-5 4.92E-4 .

Cerium-144 3.03E-5 7.86E-6 ,

Neptunium-239 8.98E-5 6.85E-5 d 1

Fission gasses - Reactor Bldg. Vent ]

l Kryp ton-85 Kryp ton-85m 1.26E+1 Krypton-87 2.83E+1 Krypton-88 3.97E+1 i Xenon-133 7.67E+2-Xenon-135 1.68E+3 Xenon-135m 2.02E+3 Xenon-138 1.16E+2 Unidentified 8.29E+3

Fission gasses - Main Stack Krypton-85 1.96E+2 Krypton-85m 1.24E+4 Krypton-87 7.12E+3 Krypton-88 2.26E+4 Xenon-133 2.93E+4 Xenon-135 8.87E+3 Xenon-135m 4.97E+2 Xenon-138 1.57E+3 Xenon-133m 5.80E+2 Unidentified 5.54E+4

NDA = No Detectable Activity 0 Isotopic analysis initiated this quarter on these gas streams.

A-4

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