ML20150E956

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Environ Radiation Monitoring Program Semiannual Rept 7, 750701-1231
ML20150E956
Person / Time
Site: Pilgrim
Issue date: 12/31/1975
From: Andognini G, Cehn J, Gina Davis
BOSTON EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8804040211
Download: ML20150E956 (52)
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BOSTON EDISON COMPANY Ge~enat Orr css soo Bonsvo Svarer B OS T O N. M ASSACHUSE TTs 02199 March 1, 1976 Director R:gion I, Inspection and Enforcement U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Docket No. 50-293 License No. DPR-35 Semi-Annual Report No. 7 Environmental Radiation Monitoring Program Gentlemen:

In accordance with Pilgrim Station, Technical Specification 6.9.C.2, we are hereby submitting our seventh Semi-Annual Report. A separate report covering Technical Specification 6.9.C.1 and entitled, "Semiannual Summary of Radio-active Effluents" has been sent under separate covcr.

Very truly yours, Original Signed by G. Carl Andognini Manager -

Nuclear Operations cc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (20)

Director Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (2)

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BOSTON EDISON COMPANY PILGRIM NUCLEAR GENERATING STATION Environmental Radiation Monitoring Program SEMIANNUAL REPORT NO. 7 JULY 1, 1975 THROUGH DECEMBER 31, 1975 Prepared By Joel I. Cehn Environmental Sciences Group Nuclear Engineering Department Match 1976 Approved By:

G. Ja s Davis, Manager Envir nmental Sciences Group

TABLE OF CONTENTS Section' Page I. INTRODUCTION AND

SUMMARY

..................... .1 II. DESCRIPTION OF MONITORING PROGRAM ............ 3 III. MONITORING DATA AND RESOLTS................... 4 A. Air Surveillance ......................... 4 B. External Gamma Exposure .................. 4 C. Milk ................... ................. 5 D. Crops .................................... 5 E. Domestic and Recreational Water .......... 5 F. Precipitation ............................ 5 G. Seawater ................................ 6 H. Marine Life .............. ............... 6 I. Bottom Sediment .......................... 7 IV. 1975 SEAFOOD INGESTION DOSES ................. 8 APPENDIX A

SUMMARY

OF RADIOACTIVE EFFLUENTS ............. A-1 APPENDIX B ANALYSIS OF NATIONAL BUREAU OF STANDARDS REFERENCE MATERIAL ........................... B-1 11 A

LIST OF ILLUSTRATIONS Figure Page

1. Location of Offsite Monitoring Stations ....... 9
2. Location of Onsite Monitoring Stations ........ 10
3. Aquatic and Terrestrial Surveillance Stations.. 11 3A. Mollusc, Algae and Sediment Sampling Stations ...................................... 12
4. Radioactivity in Air Particulates - East Weymouth (EW) ................................ 13
5. Radioactivity in Air Particulates - Overlook Area (OA) .................................... 14
6. Concentrations of Strontium-90 and Cesium-137 in Milk (Plymouth) ............................ 15 iii

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LIST OF TABLES Table Pace 1 Terrestrial Sampling Schedule ..................... 16 1A Marine Sampling Schedule +.......................... 17 2 External Gamma _ Exposure Surveillance Sta tions (TLD) ............................................. 18 3 Air Particulates and Gaseous Radiciodine Surveil-lance Stations .................................... 19 4 Terrestrial Sampling Locations..................... 20 5 Environmental Sample Analysis Parameters .......... 21 SA Typical Detection Sensitivities Achievable by High Resolution Ge(Li) Gamma Spectroscopic Analysis of Environmental Samples ............................. 22 6 Air Particulates - Gross Beta Concentrations in Weekly Samples (pCi/m3) ........................... 23 7 Air Particulates - Gross Gamma Concentration in Monthly Composites (cpm /m3 x 10-3) ................ 24 7A Air Particulates - Gamma Isotope Concentration in Monthly Composites (pci/m 3) ....................... 25 7B Air Particulates - Strontium-90 Concentration in Quarterly Composites (pCi/m3 x 10-4)............... 26 8 Particulate Iodine-131 in Air Samples (pCi/m )

July - December 1975 .............................. 27 8A Gaseous Iodine-131 in Air Samples (pCi/m )

July - December 1975 .............................. 28 9 External Gamma Exposure Rates, July - December 1975 (uR/hr) ...................................... 29 10 Radionuclide Concentrations in Milk (pCi/1)........ 30 11 Radioactivity in Crops ............................ 31 12 Radioactivity in Domestic and Recreational Water .. 32 12A Gamma Isotopic Concentrations in Domestic and Recreational Water (pCi/ liter) Monthly Composites - 1975 ................................. 33 iv

LIST OF TABLES - Continued Table Page 13 Radioactivity in Precipitation - Plymouth Massachusetts .................................... 34 14 Radioactivity in Seawater July - December 1975 ... 35 14A Gamma Emitting Isotope Concentrations in Seawater (pCi/1) Monthly composites 1975 .................. 36 15 Radioactivity in Marine Life, 1975 ............... 37 15A Radioactivity in Marine Life, January - June 1975. 39 16 Radionuclides in Bottom Sediment (pCi/g) ......... 41 17 1975 Seafood Ingestion Doses ..................... 42 B-1 Analysis of NBS Standard Reference Material (pCi/g) .......................................... B-2 v

I. INTRODUCTION AND

SUMMARY

This report discusses the data accumulated by the Environmental Radiation Surveillance Program during the semiannual period July 1 through December 31, 1975.

Pilgrim Station operation during the reporting period is detailed in a separate report entitled "Operating and Maintenance Annual Report, 1975." Power levels during this period were limited, administratively, to 70 percent of full power from July through October, and to 60 percent of full power during November and December. These limits on power levels were set by Boston Edison Company for reasons of operation and maintenance. Plant capacity factors (a measure of electrical output as a percentage of full output 100 percent of the time) during the reporting period were:

July, 43 percent; August, 53 percent; September, 19 percent; October, 3 percent; November, 50 percent; and December, 53 per-cent.

The Environmental Radiation Surveillance Program was implemented during the reporting period as required by the Nuclear Regulatory Commission. Plant-related radioactivity levels in marine life and sediments decreased from 1974 levels, as did liquid effluent releases to Cape Cod Bay. The current levels of Mn-54, Co-60, Zn-65 and Cs-137 in these media are less than 1 picocurie per gram.

Gaseous radiciodine was detected onsite at levels less than 1 picocurie per cubic meter. This I '31 was attributed to releases from the reactor building vent.

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Finally, marine media data from 1975 were reviewed and calcula-tions showed that the seafood ingestion dose to an individual con-suming these media would be less than 0.1 millirem per year.

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II. DESCRIPTION OF MONITORING PROGRAM The Environmental Radiation Monitoring Program is being per-formed in accordance with the requirements specified in the Pilgrim Facility Operating License (DPR- 3 5) . Summaries of the sampled media, sampling locations, frequences of collection, analyses and detection sensitivites are given in Tables 1 through 5A. Sampling locations are shown in Figures 1, 2, 3 and 3A. The summary description provided herein was revised January, 1976; therefore, the sample results reported in Section III of this re-port may not follow schedules as shown. A more detailed program description is contained in a separate report entitled, "Environ-mental Radiation Monitoring Program, Program Description and Procedures, January, 1976."

3

III. MONITORING DATA AND RESULTS A. Air Surveillance Weekly air surveillance samples were analyzed for gross beta ac-tivity and radioiodine activity. The results are presented in Tables 6, 8 and 8A. The measured radiciodine levels have a com-puted dose equivalent of less than 0.5 millirem over the report-ing period to the thyroid of a continuous occupant at the "ware-house" onsite location. The corresponding offsite radiciodine inhalation dose is less than 0.25 millirem. Monthly gross gamma results, quarterly gamma spectra (composites of week 1; samples) ,

and quarterly strontium-90 concentrations are presented in Tables 7, 7A and 7B respectively. These data show lower levels of airborne fallout than reported for the previous reporting periods. This reflects the reduction in atmospheric nuclear weapons testing. Long term variations in airborne radioactivity are shown in Figures 4 and 5.

B. External Gamma Exposure External gamma exposure rates, measured with CaSo4(Dy) Radiquard dosimeters, are reported in Table 9. The combined exposure for November and December was the result of replacement dosimeters not being available during December. Two unusually high exposures were noted for that period. They occurred at locations OA and WS, both onsite, close-in locations. The source of these expo-sures is still being investigated and conclusions will be report-ed in a later report.

4

C. Milk Milk was sampled from two locations and from a store in Plymouth.

The samples were analyzed monthly for Cs-137, Sr-90, Ba/La-140 and I-131. The results obtained during the reporting period are presented in Table 10. The levels of strontium and cesium meas-ured in Plymouth milk do not exceed the levels measured prior to station operation, as shown in Figure 6. Radiobarium and radio-iodine levels were below reporting limits in all cases.

D. Crops Commercial produce was sampled during the reporting period, in-cluding hay, lettuce, cranberries and corn. The results of gamma spectrometry and radiostrontium analyses are presented in Table

11. Activities detected did not exceed preoperational levels.

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. The results of gamma spectral analyses on selected samples are presented in Table 12A. Radio-activity in the water sampled is primarily due to K-40, Ra-226 and Th-228 (all naturally occurring isotopes).

F. Precipitation A precipitation collection station in Pl; ^outh, five miles from the plant, was sampled during the reporting period. The radio-activity found in the monthly samples is reported in Table 13.

5 A

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

These were analyzed for fractional gross beta (explained in Table 14), gross gamma, ium, and iodir.e-131. The results of these analyses and of quarterly analyses of intake and discharge sea-water for specific radioisotopes are presented in Table 14.

Fluctuations in Sr-90 and Cs-137 levels are attributed to re-duced accuracy of seawater analysis at very low activities. The results of gamma spectrometry of the monthly samples are given in Table 14A. No plant-related activi;y was detected.

H. Marine Life Finfish, shellfish and algae were sampled during the reporting period. The results of radiostrontium and gamma spectral analy-ses are presented in Table 15. The results of analyses of sam-ples from the previous reporting period, not reported in Semi-annual Report #6, are presented in Table 15A. Media .in which trace amounts of plant-related radionuclides were detected dur-ing 1975 include cunner, Atlantic menhaden, Atlantic cod, blue mussel, Irish moss and rockweed (Ascophyllum nodosum). No plant-related activity was detected beyond two miles from the plant.

Potential radiation doses to humans resulting from these levels of radioactivity are discussed in Section IV.

6

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I. Bottom Sediment Results of analyses of ocean bottom sediments in the vicinity of the plant are presented in Table 16. Sediment is sampled to ap-proximately 1 cm depth; however, core samples are planned for 1976. Trace amounts of plant-related radionuclides were detected in the vicinity of the discharge canal.

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e IV. 1975 SEAFOOD INGESTION DOSES Samples of potential seafood taken in 1975, and found to contain plant-related radionuclides, were assumed to have been ingested by consumers, and estimations of dose were made. The activities deuected in these samples were averaged within each of the three groups: finfish, shellfish and algae. These average activities are shown in Table 17.

Dose calculations were based on Draft Regulatory Guide 1.AA.

Consumption rates and ingestion doses are presented in Table 17.

The ingestion doses resulting from 1975 liquid releases totaling 1.2 curies were much less than 1 mrem / year to an average indivi-dual.

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I TABLE 1 TERRESTRIAL SAMPLING SCHEDULE Number of Medium Frequency Sample Size Locations

  • Domestic Monthly Composites 4 liters 4 Water of Weekly Samples Recreation Monthly Composite 4 liters 1 Water of Weekly Samples All Particulates Weekly 10,000 ft 3 yy and Gaseous Iodine air Gamma Radiation Monthly 4 TLD read- 39 outs per location Precipitation Monthly as collected 1 Lettuce Annually 1,000 grams 3 and Cabbage (June or July)

Corn, Potatoes Annually 1,000 grams 2 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.

16

TABLE lA MARINE SAMPLING SCHEDULE Medium Frequency Sample Size Quantity Irish Moss Alternate months I liter dried 1 from each (Chondrus crispus) loc 1 tion

  • Blue Mussel Monthly 1 liter 1 from each (Mytulis edulis) April-September location
  • Softshell clam Quarterly, 1 liter 1 from each (Mya arenaria) Oc tober-Ma rc h location
  • Quahog Monthly - as I liter 1 from each (Mercenaria) availaole location
  • Lobster Monthly, 450 grams 2 from each (Homarus americanus) May-October location
  • Sediment Quarterly Vertical core 1 from each to 25 cm location
  • Finfish Groups I & II'* Monthly 400 grams 3 from each group Groups III & IV Quarterly 400 grams 5 from e,ch 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.
    • Groupings are shown below I. Bottom Oriented II. Near Bottom III. Anadromous IV. Coastal Migratory Distribution Winter flounder Tautog Alewife Bluefish Yt llowtail 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.
  • This schedule partially implemented in 1975, to be fully implemented in 1976.

17

TABLE 2 EXTERNAL GAMMA EXPOSURE SURVEILLANCE STATIONS (TLD)

Surveillance Stations Station Location **

Req'd by Operating License Not Req *d by (%erating License Station See Item Offsite Onsite Offsite Code Fig. No. Direction Distance Onsite MT 2 14 S 0.38 m Microwave Tower W 0.03 m OA 2 9 Overlook Area SSW 0.21 m H 2 6 Property Line W 0.14 n.

I 2 3 Property Line W-NNE O.07 m PA 2 7 Public Parting Area B 2 13 SSE 0.26 m Rocky H!11 Road 21 SE 0.8 m Rocky Hill Road ER 2 WR 2 18 W-WNW 0.3 m Rocky Hill Road CR 1 7 S 4.9 m Cleft Rock Area East Weymouth* EW l 15 NW 23 0 Kingston KS 1 2 WNW 10 m ME 1 9 SE 2.5 m Manomet Manomet MP 1 8 ESE-S 2.25 m p SSE 2.5 m Manomet MS 1 10 ao 1 3 WNW 5.5 m North Plymouth NP Plymouth Airport SA 1 14 WSW 8 m Plymouth Center PC 1 4 W-WNW 4.5 m Sagamore CS 1 13 SSE+S 10 m SP 1 5 WSW 3 m South Plymouth East Breakwater EB 2 10 ESE 0.35 m Pedestrian Bridge PB 2 8 N 0.14 m Property Line C 2 11 SE 0.35 m Property Line D 2 1 NNW 0.37 m Property Line E 2 17 S 1.6 m Property Line F 2 2 NW 0.25 m Property Line 'G 2 4 W 0.4 m Property Line HB 2 12 SE-SSE 0.35 m Property Line J 2 19 S-SSE 1.6 m Property Line K 2 20 S-SSE 1.7 m Property Line L 2 22 ESE-SE 0.35 m Property Line PL 2 24 NW 0.34 m Warehouse WS 2 23 SSE 0.03 m Bayshore Drive BD 1 6 WNW 0.8 m College Pond CP 1 12 SW 6.5 m Duxbury SS 1 1 NW 5.9 m Emerson Road FM 2 15 SSE 0.96 m Manomet MB 1 11 SSE 3.5 m

  • Control Station.
    • Distance in miles measured from Unit 1 Heactor Building.

TABLE 3 AIR PARTICULATES AND GASEOUS RADIOIODINE SURVEILLANCE STATIONS Surveillance Stations Reg'd by Operating License Station Location **

Not Rey'd by Operating License Onsite Offsite 3 g 3 ,

Onsite Offsite Code Rocky Hill Road Fig. No. Direction Distance Overlook Area ER 2 21 SE 0.8 m Rocky Hill Road OA 2 9 W 0.03 m WR 2 18 W-WNW 0.3 m Cleft Rock Area CR East Weymouth* 1 7 S 0.9 m Manomet EW l 15 NW 23 m Plymouth Center MS 1 10 SE 2.5 m H PC 1 14 W-WNW w 4.5 m East Breakwater EB 2 10 Pedestrian Bridge PB 2 8 ESE O.35 m Property Line N 0.14 m PL 2 24 NW Warehouse 0.34 m WS 2 23 SSE 0.03 m

  • Control Station.
    • Distances in miles, measured from Unit 1 Reactor Building.

l TABLE 4 TERRESTRIAL SAMPLING LOCATIONS  :

Direction & Distance Refer to Fiqure 3 Medium Locati,on from Unit 1 Reactor Item e Domestic Water South Pond 4.75 miles WSW 1e Manomet Well 2.75 miles SSE 11 Lout Pond 4.75 miles W 12 Crest Pond 25 miles WNW 17 Recreation Water College Pond 6.5 miles SW 15 Air Particulates 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 L Lettuce & Cabbage Plymouth County Farm 3.5 miles W 13 Bridgewater State Farm 20 miles W 16  !

Karbott Farm 2.0 miles SSE 9 Hay 6 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 L Pobbins Farm 2.0 miles SSE 9 Milk Plymouth County Farm 3.5 miles W 13 Peaceful Meadows Farm 21 miles NW 19 ,

Cranbe r rie s Long Pond Road Bog 4.25 miles FW 8 ,

Beaver Dam Road Bog 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 (Fiqure 2)

Pino St. Bog 17 miles WNW 18 i

t 4

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20

TABLE 5 ENVIRONMENTAL SAMPLE ANALYSIS PARAMETERS Sample TypeI 'I and Number Analysis Frequency Detection Limit Aliquot Air Particulate (7) Cross beta Weekly 4 x 10' pC1/m 10,000 ft 3 Cross ga m Monthly 2 x 10*3 epm /m 3I*I 10,080 ft 3 131 1 Weekly 2 x 10 -2 pegf,3 10,000 ft 3 Caseous Iodine (7) 131 g Weekly 4 x 10 -2 pegf,3 10,080 ft 3 Nonsaline Water (4) Cross beta Monthly 1 pC1/ liter 1,000 ml Cross gama Monthly 5 epm /11terI "I 4,000 ml Cama spectrum (e) (d) 4,000 ml 90 Sr Monthly 0,5 pCi/ liter 1,000 ml H

Monthly 2.5 pC1/ml 4 ml Crops and Cross beta Each Sample 0.2 pCi/g 20 g Marine Life Cross ganma Each sample 0.01 epm /q(c) 1,000 g Camma spectrum Each Sample (d) 1,000 g 90 Sr Each Sample 0.005 pC1/g 100 g Seawater (3) Fractional gross beta Monthly 5 pCi/ liter 500 ml Cross gama Monthly 5 cpm /11ter ICI 4,000 ml Cama spectrum (e) (d) 4,000 ml 3

H Cuarterly 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 pci/ liter 1,000 ml 58 Co Quarterly 5 pCi/ liter 1,000 ml

'O Co Quarterly 5 pCi/ liter 1,000 ml 65 1n Quarterly 5 pCi/ liter 1,000 ml 131 1 Quarterly 5 pC1/ liter 1,000 ml Milk (2) 90 Sr Monthly 2 pCi/ liter 1,000 ml 137 Cs Monthly 1 pCi/ liter 1,000 ml 140 Ba Monthly 5 pCi/ liter 1,000 ml 131 1 Monthly 2 pCi/ liter 2,000 ml Botton Sediment (1) Cross beta Semiannually 2 pCi/g 1g Gama Spectrum Semiannually (d) 1,000 g

'O sr Semiannually 0.005 pCi/g 100 g Background Carria exposure Monthly 1 LR/hr 1-month Radiation (19) rate (a) exposurri NOTE: Provided by Interex Corp., Natick, Massachusetts (a) Measured with thermoluminescent dosimeter.

(b) In the counter used. 1epmcorrespondsto2.2pCio{3h37 Cs.

(c) In the counter used, 1 cpm corresponds to 9 pCi of Cs.

(d) Ce(Lil detection sensitivities are given in Table 5A.

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

(f) NuP.bers in parenthesis are technical specification requirements: actual number of saeples is usually greater thari the :".inirnum.

21

TABLE SA TYPICAL DETECTION SENSITIVITIES ACHIEVABLE BY HIGH RESOLUTION Ge(Li) GAMMA SPECTROSCOPIC ANALYSIS OF E!NIRONMENTAL SAMPLES Water (1 liter) Solids Filters Nuclide pCi/I (400 gm) pCi/cm pCi/ total filter Be-7 8E+01 2E-01 2E-01 K-40 2E+02 SE=01 SE+01 Cr-51 8E+01 2E-01 8E+01 Mn-54 8 2E-02 2 i Co-59 8 2E-02 2

$ Fe-59 lE+01 4E-02 3 Co-60 8 2E-02 2

Zr-95 lE+01 4E-02 3 l

l Ru-103 8 2E-02 2 l Ru-106 8E+01 2E-01 8E+01 1

I-131 1E+01 3E-02 2 Cs-134 9 2E-02 2 Cs-137 9 2E-02 2 Ba-140 3E+01 8E-02 6 La-140 2E+01 4E-02 2E+01 Cc-141 2E+01 4E-02 3 Ce-144 8E+01 2E-01 2Et01 Ra-226 6E-01 lE-01 lE+01

] Th-228 lE+01 2E-02 1E+01 Zn-65 2E+01 3E-02 3 22

4 1

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TABLE 7 AIR PARTICULATES - GROSS GAMMA CONCENTRATION IN MONTIILY COMPOSITES (cpm /m x 10-3) (a)

Control Offsite Onsite Collection East Plymouth Cleft Manomet Rocky Hill Property Overlook Pedestrian East Rocky Hill' Period (1975) weymouth Center Rock Area Substation Road (West) Line Area. Bridge Breakwater Road (Fast) Warehouse 9 8 9 13 6 3 3 9 9 5 4 July August 4 7 3 9 8 <3 6 7 7 11 7 September 5 <3 5 7 9 4 <3 <3 14 8' <3 Octoter 11 9 7 9 4 5 20 7 4 <3 6 to November 4 <3 <3 5 <3 6 8 <3 <3 <3 8 b

December <3 <3 12 <3 <3 <3 <3 <3 3 <3 10 ta) Analytical error is +2 or 10e, whiche ver is larger.

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AIR PARTICULATES - STPONTIUM-90 CONCENTRATION IN QUARTERLY COMPOSITES (pCi/m 3 x 10-4) i offsite Onsite Control Rocky Hill Property Overlook Pedestrian East Rocky Hill East Plymouth Cleft Manomet Collection Period (1975) Weymouth Center Rock Area Substation Road (West) Line Area Bridge _ Breakwater Road (East) Warehouse _

8+2 11 + 4 12 + 2 11 + 2 14 1 4 13 + 2

<2 12 + 2 Jan - Mar 13 + 3 1312 <2 6+2 21 + 5 14 + 4 19 + 4 16 + 2 10 + 2 17 + 4 Apr - June <6 19 + 3 17 + 3 4 ,

Pt 7+2 e+1 43 6+ 1 4+1 5+1 6+1 J4 July - Sep 611 5+1 6+ 1 5+1 2+2 3+2 1+1 7+2 3+1 <3 Oct - Dec 311 4 + 1 3+1 511 311 , ,

- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ - ___ _ ____ _- __ __ __ . . . .D

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- . _ - _ x.__.,_. _ ,_. . _ _ _ __ _ _ _ _ -

TABLE 9 EXTERNAL GAMMA EXPOSURE RATES, JULY - DECEMBER 1975 (pR/hr)("}

Onsite Monitoring Locations July Aug Sep Oct Nov/Dec overlook Area (OA) (b) 31.9 31.5 56.9 145.5 East Breakwater (EB) 7.3 11.2 11.2 11.5 11.3 Emerson Road (EM) 7.5 10.0 10.0 11.0 9.2 Microwave Tower (MT) 6.7 9.7 10.3 10.4 11.4 Public Parking Area (PA) 8.7 12.6 12.6 11.5 (b)

Pedestrian Bridge (PB) 12.5 17.6 17.6 26.5 31.7 White Horse Road (WH) 6.9 8.3 9.6 8.6 6.7 Property Line (A) 9.2 12.4 10.8 10.8 15.1 Property Line (B) 7.9 10.9 12.4 12.1 13.4 Property Line (C) (b) 9.7 11.2 10.6 11.0 Property Line (D) 8.2 10.9 10.6 10.1 10.2 Property Line (E) 6.4 8.6 9.0 9.6 8.2 Property Line (F) 9.8 12.5 12.0 11.5 12.3 Property Line (G) 7.9 11.2 10.9 11.1 11.6 Property Line (H) 8.6 14.4 11.2 11.8 12.8 Property Line (I) 7.9 9.8 10.3 8.2 10.6 Property Line (J) 6.9 8.0 9.0 8.3 8.2 Property Line (K) 6.3 7.3 8.6 9.4 8.8 Property Line (L) 8.5 10.9 10.7 10.3 10.7 Property Line (PL) 8.7 10.1 11.2 10.4 11.5 Warehouse (WS) 12.8 17.4 16.4 9.6 82.4 Property Line (HB) 8.2 11.0 10.5 12.5 11.1 Average Onsite 10.6 12.1 12.1 11.3 21.6 offsite Monitoring Locations College Pond (CP) 5.9 7.3 8.4 8.3 7.1 Cleft Rock Area (CR) 7.0 8.8 9.6 9.6 9.0 Sagamore (CS) 6.9 9.4 10.3 10.4 10.3 Rocky Hill Rd East (ER) 6.7 8.8 10.0 8.2 9.6 East Weymouth (EW) 6.4 8.0 9.0 9.7 9.0 Kingston (KS) 5.6 6.1 8.1 8.2 7.4 Manomet (MB) 4.8 (b) 12.3 (b) (b)

Manomet (ME) 7.9 9.4 11.1 11.7 11.2 Manomet (MP) 5.9 7.3 9.2 12.5 9.3 Manomet Substation (MS) 7.3 8.6 10.5 11.1 10.4 North Plymouth (NP) 6.3 8.5 9.6 9.7 6.5 Plymouth Center (PC) 5.5 6.1 8.0 7.6 7.5 Plymouth Airport (SA) 5.9 8.0 8.9 8.1 7.4 South Plymouth (SP) 6.4 8.2 10.3 9.9 10.9 Duxbury (SS) 6.2 6.5 9,5 7.6 7.7 Rocky dill Rd West (WR) 8.2 9.5 11.4 11.1 12.6 Bayshore Drive (BD) (b) (b) (c) (c) (c)

Average Offsite 6.4 8.0 9.7 7.9 8.1 (a) Measured with CaSO4(Dy) Radi-guard dosimeters.

(b) Dosimeter stolen.

(c) Dosimeter not put out.

29

TABLE 10 RADIONUCLIDE CONCENTRATIONS IN MILK (pCi/l) i Collection Period Plymouth Analysis (1975) (County Farm) Bridgevyter Local Store  ;

Cs-137 July 15 + 1 16 + 2 4+1 Aug 8T1 11 T 2 14 T 3 i Sep 7I1 13 T 1 771 Oct 11 T 1 12 7 1 871 Nov 15 I 1 4I1 16 I 2 Dec 7{1 12 { 1 10 [ l Sr-90 April I "I 7+1 8+1 10 + 1 July 4T1 18 I 1 15 T 1 Aug 19 I 2 671 5T1 r Sep 7I1 5I1 5T1 Oct 7I1 771 6I1 '

Nov 6I1 8I1 9I1 Dec 4{l 6{l 6[l I-131 July <2 <2 <2 Aug < <2(b)

Sep

<52 (b) <52 (b) <4 Oct <2 <2 <2 Nov <2 <2 <2  ;

Dec <2 <2 <2

<5 <5 <5 Ba/La-140 July

<20(b)

Aug <20(b) <20(b)

Sep <5 <5 <5  :

Oct <5 <5 <5 Nov <5 <5 <5 Dec <5 <5 <5 P

1 (a) Data not included in previous report.

(b) Determined by gamma spectrometry, i

30

e nw M w w 8 M MNN o. o. o. ww o. M o. o. MN M m o o+lo,1 o o M o. o. o. o. +1 o. o. +t o. o+1 +1 o. o. o.

i o coo N e oo e om M oo o a v v v v v v v v v v e. M. m. o. v M. M.

o oo o o o e

w o m. m. e. w. N. .N o. m. m. e.

w o ooo w e.

. m. e. o o +l o oo o 4 +l +%+1+l M oo oo +l +l +1 + l+ 1 +1 M v v v v v

e. M. m. e. e. o m. ee m. m.

N mem o TN e Nm e o M MNN w Nw mm N N e MM

@ 00 e o. o. o. o. o. Oe o. o. o. o. o. b. o. M.

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. a. h. m. e. m e. w e. m. e.

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& a w eeh e em eo m mw e em e M &c M NNN M NN Nm M NM N NN Q. w h E9e & P&& A A D. 1A W M P & PP W 9QM~ S 333 6 44 44 33 3 SS U M ( 444 M MM MM M4 4 44 O e e EE ww 5 N 9 K e Eh E

C Eb 6 6 E E O wt 9 9 W E E & 66 96 h M 4W bb b 9 9 u 9W 69 9

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  • PEOO $ &
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4 5 Q C

C- CC CC C C C C C C E wk k 6 9 9 9 9 4 9 h >> w& W U 9 OO 00 w w ww ww 9 9 9 O 4 M UU UO Q U LU UU  % EE )) b Ze 31

I TABLE 12 RADIOACTIVITY IN DOMESTIC AND RECREATIONAL WATER Collection 1.ittle College 1.out Pond Manceet Analysis Date (1975) Grea}a)

Pond South Pond Pond Well Well I

Gross Beta July 4.6 +1.0 <1.0 2,6 +1.0 1.1 +1.0 <1.0 '

(pC1/1) Aug 5.4 71.0 1.1 +1.0 2.4 T1.0 1.5 T1.0 <1>0 Sep 1.8 T1.0 1.0 71.0 1.8 71.0 <170 <1.0 Oct 4.9 T1.0 3.0 71.0 5.0 71.0 1.0 +1.0 <1.0 '

Nov 5.7 T1.0 2.2 71.0 4.2 71.0 8.0 71.0 <1.0 I Dec 4.4{1.0 2.011.0 1.511.0 <170 <1.0 Gross Gama July <5 5 +5 6 +5 <5 <5 i (epm /1) Aug <5 <T <T 12 +5 12 +5 i

Sep <5 <5 <5 <5 <5-l Oct <5 <5 <5 5 +5 <5 4

Nov <5 <5 <5 19 75 14 +5 Dec <5 <5 <5 11 {5 17 {$

Strontium-90 July <0.5 <0.5 <0.5 0.7 +0.5 <0.5 (pci/1) Aug 0.7 +0.5 0.5 +0.5 <0.5 <075 <0.5 '

Sep 1.0 70.5 <075 0.9 +0.5 <0.5 <0.5 Oct 0.6 70.5 <0.5 <076 <0.5 <0.6 #

Nov <075 <0.5 <0.5 <0.5 <0.5 Dec <0.5 <0.5 <0.5 0.5 +0.5 <0.5 Iodine-131 July <5 <5 <5 <5 <% >

(pci/1) Aug <5 <5 <5 <5 <5 l Sep (b) (b) (b) <5 <5 Oct <5 <5 <5 (b) (b)

Nov <5 <5 <5 <5 <5 Dec <5 <5 <5 <5 <5 .

Tritium July < 2.. $ <2.5 <2.5 <2.5 <2.5 (pC1/c]) Aug <2.5 <2.5 <2.5 <2.5 <2.5 t Sep <2.5 <2.5 <2.5 <2.5 <2.5

  • Oct <2.5 <2.5 <2.5 <2.5 <2.5

, Nov <2.5 <2.5 <2.5 <2.5 <2.5 Dec <2.5 <2.5 <2.5 <2.5 <2.5 i

i (a) Control location.

(b) Iodine aliquot accidentally contaminated.

i l

a

)

i 32

r TABLE 12A GAMMA ISOTOPIC CONCENTRATIONS IN DOMESTIC AND RECREATIONAL WATER (pCi/ liter)

MONTHLY COMPOSITES - 1975 Location Date Cs-137 Mn-54 Co-58 Co-60 Zn-65 I-131 K-40 Other Lout Aug <20 <20 <10 <20 <30 <20 Pond Wel1 Oct <20 <20 <20 <20 <40 <30 Ra-226 l

40 +20 -

Nov <20 <20 <20 <20 <40 <20 300 1200 i

Manomet Aug <20 <20 <10 <20 <30 <20 200 1100 "11 <40 <30 Oct <20 <20 <20 <20 300 1200 l w South Sep <20 <20 <20 <20 <40 <120 400 1300 Th-228 i Plymouth 20 12C l Oct <20 <20 <20 <20 <30 <50 400 1200 l

Great Pond i Pumping l

Station Oct <20 <20 <20 <20 <40 <80 400 +200-College Pond Nov <20 <20 <20 <20 <40 <40 300 1200 i

l 4

I i

1

,,.mm,- - .. , _ . . .. ,, -- ,_, -.-, -. . . , . . - , , . _ = - - _ . - - _ - . - . r . , - - , _ ..- ____ . - , _ . . , . _ _ - _-, - - . . . . _

I l

TABLE 13 RADIOACTIVITY IN PRECIPITATION - PLYMOUTH MASSACHUSETTS (#} ,

Cross Gross Collection Period Beta Gamma Sr-90 H-3 (1975) ,yCi/m2)

( (cpm /m2) (pci/m2) (pci/m2)  ;

May(b) <120 60 130 <l50 410 1110 June I 470 1110 1480 1300 100 190 <240 July 1170 +100 <120 70 +60

<290 August <180 <120 <70 <290 September <340 <180 <110 <540 ,

October 220 1170 <120 <50 <260 November 270 1120 <65 <290 220 1190 December 940 120 <71 <360 370 1240 1

(a) Analysis not required by operating license.

(b) Results listed as incqmplete in last report. ,

9 I

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S e C snrt 1234 snrt i234 al rbye d

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8

(+W

TABLE 14A GAMMA EMITTING ISOTOPE CONCENTRATIONS IN SEAWATER (pCi/l)(#}

MONTHLY COMPOSITES 1975 l

Date Cs-137 Mn-54 Co-58 Co-60 Zn-65 K-40 Other Location Pilgrim Intake July <23 <10 <10 s20 <30 300 +200 Aug <20 <20 <20 <20 <40 900 +200 Th-228 30 420 Sept <20 <20 <20 <20 <40 900 +100 Oct <20 <20 <20 <20 <40 600 +200

~

Nov <20 <20 <20 <20 <40 600 +200 Dec <20 <20 <20 <20 <40 600 +200 Pil. Discharge July <20 <10 <10 <20 <50 500 +200 Th-228 60 +20 Aug <20 <20 <20 <20 <40 900 +200 Sep <20 <20 <10 <20 <40 800 +200 m

m Oct <20 <20 <20 <20 <30 900 +200 Nov <20 <20 <20 <20 <40 600 +200 Dec <20 <20 <20 <20 <40 600 {200 Powder Point Aug <20 <10 <10 <20 <40 300 +200 Sep <20 <20 <20 <20 <40 700 +200 Oct <10 <10 <20 <20 <30 700 +200 Nov <20 <20 <20 <20 <40 400 +200 Dec <20 <20 <20 <20 <30 500 +200 Priscilla Beach Sep 18 <20 <20 <20 <20 <30 600 +200 White IIorse Beach Sep 18 <20 <10 <20 <20 <40 500 +200 (a) Results of Ge (Li) spectrometry.

I l

TABLE 15 RADIOACTIVITY IN MARINE LIFE, 1975

    • f' Sr-89 Sr-90 Results - pci/gm Mn-54 Co-58 Co-60 K-40 Cs-137 Sample Type Location (1975) Gross Beta Aug 12 2.9 +0.3 <0.05 0.006+0.005 <0.03 <0.06 <G.02 5.5+0.6 0.03+0.02 Bluefish Rocky Point

<0.2 <0.02 <0.02 <0.04 <0.02 <0.6 <0.02 Clams (Mya) Warren Cove July 16 2 ~+0.2 <0.5 <0.02

<0.2 <0.01 0 '2 <0.03 <0.02 Clams (Mya) Plymouth Harbor July 17 1.3 +0.1 <3.02 1.1+0.3 <0.02 Clams (Mya) Duxbury Bay July 18 0.86[0.09 <0.1 e0.008 (0 s2 <0.03

<0.2 c0.02 <0.u2 <0.03 <0.02 0.9+0.3 <0.02 Clams (Mya) Rocky Nook July 18 1.4 +0.1

<0.C3 2.6TO.4 <0.03 Clams (Mya) Plymouth Harbor Aug 28 1.1 70.2 <0.02 <0.005 <0.03 <0.06

<0.07 <0.04 2 70.5 <0.04 Clams (Mya) Duxbury Bay Aug 29 1.3 70.2 <0.04 <0.014 <0.04

<0.03 1.5T0.6 <0.03 Clams (Mya) Rocky Nook Aug 29 1.6 70.1 <0.2 0.017+0.006 <0.03 <0.05 Aug 29 4.3 70.4 <0.00 0.01570.014 <0.04 <0.08 <0.04 3.6T0.5 <0.04 clams (Mya) warren Cove Clams (Mya) Ouxbury Bay Sep 26 3.2 {0.3 <0.02 <0.607 <0.03 <0.05 <0.04 6.3{0.6 <0.04

<0.03 <0.013 <0.03 <0.03 <0.04 2.3+0.5 <0.04 Clams (Mya) Rocky Nook Sep 26 1.6 +0.2 P1, mouth Harbor Sep 30 1.3 T0.2 <0.03 <0.306 <0.03 <0.04 <0.04 3.7T0.5 <0.03 Clams (Mya) <0.03 Clams (Mya) Warren Cove Sep 30 1 {0.2 <0.01 <0.006 <0.03 <0.04 <0.04 2.6[0.4

<0.05 <C.005 <0.02 <0.06 <0.02 5.5+0.6 0.03+0.02 Cod Rocky Point July 16 3.5 +0.4

<0.05 <0.005 <0.03 <0.07 0.06+0.02 5.6+0.6 0.04+0.01 Cunner Rocky Point July 16 2.1 +0.2 Ij Winter <0.02 4.6+0.5 <0.02 Rocky Point Aug 4 2.4 ~+0.2 <0.06 40.005 <0.03 <0.06 Flounder ~

Winter <0.06 <t.02 5.3+0.5 <0.02 Flounder Rocky Point Aug 4 3.1 +0.3 <0.2 0.036+0.015 <0.03

<0.03 <0.05 <0.1 <0.05 32 +3 <0.04 Irish Mcss Ellisville Aug 27 31+3 <0.4 Irish Moss Manomet P '. . <0.04 24 +4 <0.04 Aug 27 28+3 <0.5 <0.06 <0.04 <0.06 (North)

Irish Moss Mancmet Pt. <0.05 25 +2 <0.04 Aug 27 30+3 <0.1 0.15 +0.02 <0.04 <0.07 (South) 0.19+0.05 27 0.06+0.03 Irish Moss Rocky Point Aug 28 4274 ~

<0.1 0.01470.007~

0.08+0.04

~

<0.08 ~ ~73 ~

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<0.03 <0.05 <0.03 <0.8 <0IO3 Lobster Rocky Point July 21 0.96TO.11 <0.2 0.025+0.008

<0.03 Rocky Point Aug 13 1.2070.10 <0.2 <0.620 <0.03 <0.05 <0.04 <0.9 Lobster

<0.020 <0.03 <0.04 <0.03 <0.5 <0.03 Lobster Mocky Point Aug 13 0.79{0.12 <0.2 Atlantic <0.04 <0.01 5.5+0.6 <0.01

<0.01 0.008+0.005 <0.02 Mackerel Rocky Point July 16 4.2 30.4 Atlantic <0.04 5.3+0.5 <0.02 Menhaden Rocky Point Jaly 16 3.5+0.4 <0.03 <0.005 <0.04 <0.1

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38

cr . . _ . - - . . - - - - - - - -

~ ' - LE 1SA RADIOACTIVITY IN MARINE LIFE, JANUARY - JUNE 1975 b

' Results - pei/gm Da Sample Type Location (1975) Cross Beta Sr-89 Sr-90 Mn-54 Co-58 Co-60 K-40 Cs-137 Clams (Mya) warren Cove June 15 1.5 +0.2 0.05+0.05 <0.005 <0.01 <0.08 <0.01 1.6+0.2 <0.01 Clams (Mya) Plymouth Harbor May 20 1 {0.2 <0T05 <0.005 <0.01 <0.08 <0.01 1.5[0.2 <0.01 Clars (Mya) Dux bu ry Bay May 28 1.2 +0.2 <0.01 <0.005 <0.01 <0.01 <0.01 0.7+0.2 <0.01 Clams (Mya) Rocky Nook Sla y 28 1.3 +0.2 <0.02 <0.005 <0.01 <0.02 <0.01 1.5+0.2 <0.01 Clams (Mya) Plymouth Harbor June 19 1.1 +0.01 <0.01 <0.005 <0.02 <0.02 <3.02 1.5+0.3 <0.02 Clams (Mya) Warren Cove June 19 1.3 {0.2 <0.01 <0.005 <0.01 <0.02 <0.01 1.2{0.2 <0.01 Clams (Mya) Duxbury Bay June 20 1.4 10.2 <0.08 <0.005 <0.01 <0.09 <0.01 1.710.2 <0.01 Clams (Mya) Rocky Nook June 20 1.1 +0.2 <0.03 <0.005 <0.01 <0.01 <0.01 0.9+0.2

<0.01 Atlantic Cod Rocky Point June 26 6 +0.6 <0.04 <0.005 <0.01 <0.04 <0.02 5.540.6 0.03+0.02 Cunner Rocky Point June 26 4.6 +0.5 <0.1 0.01 +0.005 <0.03 <0.1 <0.03 5.2+0.5 <0.02 Winter Flounder Rocky Point May 8 4.4 +0.4 <0.01 <0.005 <0.01 <0.01 <0.01 3.1+0.3 <0.01 w Winter e Flounder Rocky Point June 9 3.1 +0.3 <0.09 <0.005 <0.02 <0.06 <0.01 5.1+0.5 <0.01 Winter Flounder Rocky Point June 9 2.6 +0.3 <0.01 <0.005 <0.03 <0.09 <0.02 6.2+0.8 <0.02

<0.01 <0.005 <0.04 <0.05 <0.04 26 +2 <0.04 Irish Moss Ellisville June 17 3814 (b)

Irish Moss Manomet Pt.

(North) June 18 58+6 (b) <0.08 <0.009 <0.04 0.04 <0.04 24 +2 <0.03 Irish Muss Manomet Pt.

(South) June 18 52+5 (b) (c) (c) <0.05 <0.05 <0.05 32 +3 0.07+0.04 l

I Irish Moss Rocky Point June 18 83T8 (b)

~'

<0.02 <0.005 0.13+0.04

~

<0.05 0.31+0.06

~

33 ~+3 <0704 (e) l Iris' Moss White Horse l Beach June 18 18+2 (b) <0.02 <0.005 <0.03 <0.03 <0.03 17 +2 <0.03 Blue Mussel Discharge Outfall May 21 0.5 +0.2 <0.03 <0.005 <0.02 <0.J8 0.04+0.01 1.6+0.2 <0.01 Blue Mussel Plymouth Harbor May 21 0.7 {0.2 <0.02 <0.005 <0.01 <0.02 <0.61 1.6[0.2 <0.01 Blue Mussel Discharge Canal June 18 0.3 +0.2 <0.07 0.01 +0.002 <0.02 <0.02 0.04+0.01 1.3+0.3 <0.02 Blue Mussel Discharge Canal June 18 0.68{0.05 <0.02 <07005 <0.02 <0.03 0.06[0.02 0.6[0.3 <0.03 Blue Mussel Discharge Outfall June 18 0.3 +0.2 <0.02 <0.005 <0.02 <0.02 0.04+0.01 1.3+0.3 <0.02 Blue Mussel Plymouth

<0.02 <0.005 <0.004 <0.005 <0.005 <0.6 <0.004 Harbor June 19 0.4 12 0 Pollock Rocky Point May 8 3.2 +0.3 <0.01 <0.005 <0.01 <0.01 <0.01 3 +0.3 0.02+0.01

~

Pollock Rocky Point May 8 4.9 +0.5 <0.01 <0.005 <0.02 <0.02 <0.02 3.170.3 <0 02 i Pollock Rocky Point May 8 4.3 70.4 <0.01 <0.005 <0.02 <0.02 <0.02 <373 0.03+0.01 i Pollock Rocky Point May 8 4.5 {0.4 <0.01 <0.005 <0.02 <0.02 <0.02 3.6+0.4 0.03{0.01 l Pollock Rocky Point May 8 4.7 +0.5 <0.01 <0.005 <0.02 <0.02 <0.02 4.2+0.4 <0.02 Rocky Point May 8 4.3 +0.4 <0.01 <0.005 <0.02 <0.02 <0.02 4.4+0.4 <0.02 Pollock

TABLE 15A - Continued b"*f

  • Results - pei/gm Sample Tyg Location (1975) Cross Beta Sr-89 Sr-90 Mn-54 Co-58 Co-60 K-40 Cs- 137 Rockweed Pilgrim East Breakwater June 2 6.7 +0.7 (d) <0.006 <0.01 <0.01 0.12+0.02 8.4+0.8 <0.02 Rockweed Discharge outfall June 2 7.5 +0.8 (d) 0.009+0.005 0.05+0.01 <0.01 0.41+0.02 5.3+0.5 <0.01 Rockweed Manomet Pt. June ? 7.5 70.8 (d) <0!005 <07007 0.02+0.01 0.02T0.01 5.570.5 <0.008 Rockweed Rocky Point June 2 8.6 -0.9 <0.02 <0.005 0.04+0.01 <0701 0.6270.06 7.t[0.7 <0.01 Tautoq Rocky Point June 29 4.5 +0.4 <0.06 <0.005 <0.02 <0.07 *0.03 4.8+0.5 <0.03 (a) Data not included in previous report.

(b) Abnormal ash weight.

^ (c) Sample lost in analysis.

O (d) Not analyzed for this i .30 t ope .

(e) 2n-65 detected at 0.25+0.09 pei/qm.

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TABLE 16 RADIONUCLIDES IN BOTTOM SEDIMENT (pCi/g)

Date Location (1975) K-40 Mn-54 Co-5R Co-60 Cs-137 Ra-226 Sr-89 Sr-90 Discharge Outfall Mar 21 18 +2 0.05 <0.0% <0.06 <0.05 (c) <0.099(b)

Manomet Point Mar 21 12 +1 <0.05 <0.05 <0.06 <0.05 (c) <0.002 Mar 21 12 +1 <0.05 <0.05 <0.06 <0.05 (c) <0.003 IDI warren Cove 0.04 +0.02 <0.7 <0.04 Discharqe Outtall June 18 18.9 +1.9 0 03 +0.02 <0.02 0.04 10.02 W,irren Cove June 19 10 +1 <0.03 <0.04 <0.03 <0.02 0.01 +0.01 <0.002 Rocky Point Au1 12 16 +2 <0.2 <0.2 0.5 +0.1 0.3 10 2 0 . 3 + . 2 <0.02 0.03 10.01 13 <0.1 <9.1 <0.1 0.4 +0.2 <0.03 0.007 h M.i nome t Point Auo 12 .+_2 <0.1 _

g 0.8 +0.09 0.3 +0.04 <0.5 <0.04 Discharqe Canal Sep 11 21.( +2.2 0.29 +0.06

_ 0.14 10.07 Sep 18 12.2 +1.2 <0.01 <0.02 <0.01 <0.01 <0.5 <0.04 Plymouth Beach Sep 18 6.32 +0.63 <0.01 <0.02 0.01 <0.01 <0.5 <0.04 Priscilla Beach Sep 18 10 +' <0.02 <0.02 0.01 <0.02 <0.5 <0.04 white Horse Hrach Discharqe Outfall Se p 24 15 +1 <0.4 <0.6 <0.4 <0.4 0.3 +0.07,

<0.01 <0.002

<0.4 <0.6 <0.4 <0.3 0.25 +0.05 <0.04 <0.007 Manonet Point Sep 29 13 11 ,

<0.4 0.13 +0.06 <0.06 <0.006 warron Cove Sep 29 14 fl <0.5 <0 7 <0.4 (a) Result s of Ge (Lt) spectrometry (except Sr-89, 90). Senrit ivit ies are given in Table SA.

(b) Listed as incomplete in previous report.

(c) Not analyzed for this isotope.

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.,____,.c_. .

TABLE 17 1975 SEAFOOD INGESTION DOSES Assumed nsumption Average Activity Detected I#} (pCi/g)

Edible Seafood Type Co-60 Cs-137 ) Zn-65 Mn-54 (Kgm/yr) 0.06 0.04 0.02 (c) 18 Finfish 0.05 (c) (c) 0.02 9 Shellfish Algae (d) 0.3 0.05 0.03 0.15 0.73 Calculated Ingestion Dose (mrem /yr) Total Whole Body 0.008 0.005 0.0021 0.0002 0.015

" 0.068 0.0011 0.0042 0.004 0.077 GI-tract 0 0.048 0.0011 0 0.049 Bone l

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(a) Average of samples containing plant related activity.

(b) Cs-137 is conservatively assumed to be totally plant related.

(c) Not detected.

(d) Irish moss only.

1

APPENDIX A

SUMMARY

OF RADIOACTIVE EFFLUENTS This surr;aary will be supplied in a separate report entitled "Semi-annual Summary of Radioactive Effluents, July 1 through December 31, 1975."

i A-1

APPENDIX B ANALYSIS OF NATIONAL BUREAU OF STANDARDS REFERENCE MATERIAL The Standard Reference Material obtained from the U.S. National Bureau of Standards (SRM 4350) contained approximately 100 g of freeze-dried, sieved river sediment, spiked with environmental levels of radioactivity.

For the analysis, the SRM was divided into two 50 g samples, each of which was then combined with 400 g of ordinary sand. The mixtures (Standards) were each sent, along with a sample of ordinary beach sand (Blank), to Interex Corp. and Teledyne Iso-topes for analysis. The results are reported in Table B-1.

The NBS-determined radioactivities in pico-Curies per gram of the samples prepared on August 8, 1975 are shown in the indicated columns. The results of the Teledyne and Interex analyses, shown under the appropriate headings, agree reasonably well with the certified activities.

B-1

TABLE B-1 ANALYSIS OF NBS STANDARD REFERENCE MATERIAL (pCi/g)

NBS Analysis for ^^ O Teledyne Results .

Interex Results Standard *** Sent NBS Uncertainty Standard *** Sent Blank 4 to Interex Standard Blank to Teledyne Standard Isotog 13 + 2 2.09 10.4 +1.1 9.86 +1.16 8.8 K-40 2.16 16 +2

<0.2 40.1 0.0045 <0.04 <0.04 11.6 Mn-54 0.0047

<0.1 0.57 0.446 +0.068 <0.04 5.6 co-60 0.59 0.5 +0.1

<0.4 <0.4 0.024 <0.03 <0.03 13.5 2n~65 0.025

<3.007 0.039 0.13 +0.02 <0.04 15.0 Sr-90 0.04 0.03 +0.01

<0.04 4.5 Cs-137 0.4 0.3 _+0.2 <0.1 0.39 0.371 _+0.057 0,3 M Eu-152 0.96 0.6 +0.l* NV 0.93 0.801 +0.168* NV 5.8 Eu-154 0.21 0.63 +0.06* NV 0.20 0.167 +0.128' NV 7.5 0.5 +0.l** 0.13 0.417 +0.042** 0.257 +0.026** 19.1 Ac-228 0.14 0.7 +0.2**

NA 0.0056 0.0039 +0.0012 <0.0002 8.5 0.0058 NA 4

  • iterun for Eu with longer count time by request.
    • Th-228
      • Values obtained by multiplying NBS values by dilution ratio of NBS standard to blank sand (see text).

+Eu peaks calculated by request.

NA - not analyzed.

NV - no value reported.

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