ML20049H547

Rept 81, Environ Radiation Study in Vicinity of Humboldt Bay Power Plant,Eureka,Ca, Quarter Ending 810630

ML20049H547
Person / Time
Site:	Humboldt Bay
Issue date:	09/08/1981
From:	Brownrigg D, Szalinski P PACIFIC GAS & ELECTRIC CO.
To:
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ML20049H539	List: ML20049H538 ML20049H545 ML20049H547 ML20049H550
References
420-81.157, NUDOCS 8203030282
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_ _ _ _ _ _ _ _ _ _ _ _ _

Report Issued:

SEP 0 81981 Report 420-81.157 PACIFIC GAS AND ELECTRIC COMPANY DEPARTMENT OF ENGINEERING RESEARCH REPORT NO. 81 ENVIRONMENTAL RADIATION STUDY IN THE VICINITY OF HUMBOLDT BAY POWER PLANT EUREKA, CALIFORNIA QUARTER ENDING JUNE 30, 1981 (SPRING) h O') *7 Qk)

R.F.CApT, Chief Report Prepared By:

D. L. Brownrigg P. A. Szalinski l'

8203030282 820301 PDR ADOCK 05000133 R

PDR

Report 420-81.157 TABLE OF CONTENTS Page ii L I ST O F T A BL E S..........................

ii LIST OF FIGURES.........................

1

SUMMARY

1 INTRODUCTION...........................

1 SAMPLE COLLECTIONS AND ANALYSES DISCUSSION OF ANALYTICAL RESULTS.................

2 3

RELEASES OF GASEOUS RADIOACTIVE WASTE 4

REFERENCES............................

5 APPENDIX.............................

i

Report 420-81.157 LIST OF TABLES Table Page 8

1.

Samples Collected.....

2.

Radioanalysis of Marine Samples...............

9 3a. Radioanalysis of Terrestrial Samples 11 3b.

Radioanalysis of Terrestrial Samples 12 13 4

Dosimeter Measurements...................

1/

5.

Film Pack Measurements...................

6.

Air Particulate, Station No. 3, Gross Beta Activity.

15 7.

Air Particulate, Station No. 45, Gross Beta Activity 16 LIST OF FIGURES Figure Page 1.

Station Locations of Environmental Samples 17 2.

Station Locations of Dosimeters and Film Packs 18 19 3.

Chronological Display of Selected Environmental Measurements ii

Report 420-81.157 SUM 3;RY Measurements of radioactivity in marine ar.d terrestrial samples from the environment near the Humboldt Bay Power Plant during this quarter generally remained within the range of preoperational back;.ound measurements. The maximum integrated dose measured was well below the permissible contribution of 500 mrem / year in unrestricted areas.

Gross beta measurements in air particulate samples which increased starting in the latter part of October 1980 continued at higher than normal levels but began to drop at mid-quarter. The increase was due to atmospheric nuclear weapons testing conducted by the Peoples Republic cf China on October 16, 1980.

INTRODUCTION This is the 81st quarterly report on radiation in the environment near Humboldt Bay Power Plant (HBPP) covering the period April through June 1981. This report contains information on the samples collected, methods and results of radiochemical analyses, a discussion of the results, and also information about the " Releases of Gaseous Radioactive Waste" supplied by the Nuclear Plant Operations Department.

Information on the release of liauid radioactive waste from HBPP is reported elsewhere.1*

SAMPLE COLLECTIONS AND ANALYSES Air particulate filters, dosimeters, film packs, and 18 marine and terrestrial samples were collected for this report in accordance with the requirements of the North Coast Regional Water Quality Control Board,3 2

• See reference page.

2 Report 420-81.157 and the California State Department of Health.4 A table of the samples collected and maps showing the sampling locations (Figures 1 and 2) are presented in the Appendix.

Foi ty-three gross beta analyses, two iodine-131 analyses, and 19 ganna isotopic analyses were performed for this report. The results are tabulated in the Appendix. All samples exceat some beta analyses, dosimeters, and film packs were analyzed at the Department of Engineering Research (DER). Beta analysis of all marine and terrestrial samples and air particulate samples 81E55, 81E83, 81F00, 81E56. 81E84, and 81F01 was performed at Diablo Canyon Power Plant at Avila Beach, California, per applicable plant procedures. Dosimeters were read by HE7P personnel.

Film packs were read by outside contractors.

DISCUSSION OF ANALYTICAL RESULTS The environmental samples analyzed for this report contained, in general, radioactivity concentration levels comparable to preoperational activity levels of similar samples.5 During the preceding 52-week period, the maximum integrated radiation exposure was measured at Station 16. The total annual exposure at Station 16 was approximately 15.3 mR above background measured at Stations 2 and 5.

Figure 3 is a chronological display of dosimeter and film pack radiation exposures per month at Station 14 and the air particulate activity at Station 3 from January 1977 through this quarter. Reports 37, 55, and 75 contain graphs from previous years.

3 Report 420-81.157 RELEASES OF GASE0US RADI0 ACTIVE W4STE The routine releases of gaseous radioactive wastes have been monitored by the air ejector off-gas and stack-gas monitoring systems.

The calibration of these monitors for noble and activated gases has been checked by periodic analyses of " grab" samples on a multichannel gamma scintillation spectrometer. The refueling, aiaintenance, and station modification outage which started in July 1976, continued through this quarter; therefore, airborne releases were insignificant.

(

4 Report 420-81.157 REFERENCES 1.

Quarterly report to Regional Water Quality Control Board on Liquid Waste Discharge from Humboldt Bay Power Plant.

2.

Letter from North Coastal Regional Water Quality Control Board to PGandE, Attn

• F. F. Hautz, concerning modifications to waste discharge a.

2nvironmental radiation monitoring requirements, dated May 7, 1965.

3.

Letter from North Coastal Regional Water Quality Control Board to PGancE, Attn:

Mr. P. Matthew, concerning modifications to waste discharge requirements, dated April 8, 1966.

4 Department of Public Health letter to PGandE, Attn:

Mr. P. Matthew, concerning modifications to environmental radiation monitoring requirements, dated June 17, 1966.

5.

Environmental Radiation in the Vicinity of Humboldt Bay Power Plant, Reports 1-8.

6.

Code of Federal Regulations, Title 10, Para. 20.105.

5 Report 420-81.157 APPENDIX Page 6

Methods of Sample Collection and Analysis 8

Table 1 Samples Collected 9

Table 2 Radioanalysis of Marine Samples Table 3a Radioanalysis of Terrestrial Samples 11 Table 3b Radioanalysis of Terrestrial Samples 12 13 Table 4 Dosimeter Measurements 14 Table 5 Film Pack Measurements Table 6 Air Particulate, Station No. 3, Gross Beta Activity 15 Table 7 Air Particulate, Station No. 45, Gross Seta Activity 16 Figure 1 Station Locations of Environmental Samples 17 Figure 2 Station Locations of Dosimeters and Film Packs 18 Figure 3 Chronological Display of Selected Environmental 19 Measurements

6 Report 420-81.157 METHODS OF SAMPLE COLLECTION AND ANALYSIS Marine samples are collected by Humboldt State College Foundation personnel under the direction of Dr. J. A. Gast. PGandE Humboldt Division personnel collect the remainder of the samples.

Marine and terrestrial samples are processed quarterly at DER.

Samples are freeze-dried prior to determining gross beta activity. The gross beta analysis is performed on low background, thin window, gas flow proportional counters; the limit of detectability is about 0.5 pCi/gm of a standard containing K-40.

Activities are reported both per gram of the dry and per gram of the original sample.

The freeze-dried samples and domestic water are gamma scanned, using a Ge(Li) detector or an Intrinsic Germanium detector and a multichannel pulse height analyzer. The limit of detectability attained in the gama scan is typically 5 pCi/l of water solution containing a single radionuclide.

Radioiodine analyses are performed on milk samples within eight days of collection. Following addition of stable iodine to the raw milk to determine chemical recovery, iodine is separated from the milk by using anion ion exchange resin.

Iodine is stripped from the resin and after purification is precipitated as cuprous iodide for measurements by beta-gassna coincidence counting. The detection limit attained by this method is typically 0.2 pCi/ liter for I-131.

The potassium content of most of the freeze-dried samples is measured by flame photometry in order to estimate the K-40 contribution to the gross activities. The range of concentrations used is one to ten ppm; the

7 Report 420-81.157 standard deviation in the concentration units (Gaussian) is about 12 percent at the 5 ppm level. Using the factor of 830 pCi/g K, the activity of K-40 in a sample is calculated.

The tritium (H-3) activity in domestic water is determined by analyzing a distilled aliquot of the sample with a liquid scintillation spectrometer. The limit of detection for this analysis is typically 0.2 pCi/ml of water.

The airborne particulate samplers are located at Stations 3 and 45 (Figure 1). The constant flow samplers have flow rate in the range of 30 to 40 1pm; an HV-70 filter is used. The filters are collected on a weekly basis and mailed to DER. The filters are counted to determine gross beta activity at least 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after collection to allow for naturally occurring short-lived radionuclides to decay.

Gamma dosimetry is performed with two ion chambers (Victoreen, Model 239) and a film pack located at each of the 30 stations shown in Figure 2.

The ion chambers are read in the field by HBPP personnel on a biweekly basis. The lower of the two readings is normally reported since the dosimeters normally read high on failure. The Radiation Detection Company (RDC), Sunnyvale, California, supplies and reads the film packs. RDC reports film pack doses relative to " background" at the RDC laboratory, which consistently is 8 mR/ month.

The

• term in the following tables is the two-sigma error; i.e., the i

95 percent confidence level.

l I

1

TABLE 1 Report 420-81.157 SAMPLES COLLECTED i

Marine Verte-Clams 5 Other Bottom Terres-Air Dosi-Film Station Flora brates Oysters Invert.

Sedim.

trial Partic, meters Packs 1 K. Salmon Picnic Area 2

6 3

2 1742 Wood, Fortuna 6

3 4

3 Humboldt Hill (HH) Rd 13 6

3 4 Wood 5 K, Eureka 6

3 5 Redwood Ave, Arcata 1

6 3

i 6 Table Bluff 5 Clough 6

3 7 Col. of the Redwds 6

3 t

8 Hmblt H1 Rd 6

3 9 Harbor View 5

3 10 8 St., Field Lndg 6

3 11 Whittier Ct 6

3 12 Bell Hill Rd, HH 6

3 i

13 Crab St, Buhne Pt 6

3 14 South Bay School 6

3 i

15 Eich Rd 6

3 16 Bennett Dairy 1

6 3

17 Bassford Rd, Ridgewd 6

3 18 6418 Elk River Rd 6

3 4

19 Noe St 6

3 20 3537 Union St 6

3 21 PG5E Well 2, HH Rd 6

3 22 Sta B - 14th St 6

3 23 Harris St. Substa.

6 3

24 PG5E Office, Eureka 6

3 25 Irving Dr 6

3 26 Worthington Cr 6

3 27 Berta Road, 6700 6

3 28 Berta Road, 7200 6

3 29 Vista Rd 6

3 30 Burns Dr 6

3 45 Humboldt Substation 13 48 Holgerson Dairy 1

55 PG5E Outfall 2

1 56 1000 ft. N Outfall 3

1 57 1000 ft. S Outfall 3

1 59 Hookton Channel 1

65 Coast Oyster Co.

1 i

TABLE 2 Report 420-81.157 RAD 10 ANALYSIS OF MARINE SAMPLES K40 Activity Gross Beta Potassium Gross Activity in Potassium Content Activity Collec-Beta (pCi/g Dry Sample)

(pCilgDr{f (pCi/g Orig.

tion Counting

[,g gfg

)

Sta Sample Description Date Date Beta

Gammal, Dry Sample)

Sample)-

Sample) 55 81093 Sediment _/

5/23/81 7/10/81 4.91*0.37 137Cs=0.013*0.004 3.12 2.59 4.01*0.30 3

55 Red Algae _/

4 (Gigartina agardhii) 55 81095 Red Algae 3_/

5/23/81 7/10/81 7.67*0.54 10.6 8.80 0.98*0.07 (Iridaea sp.)

55 81094 Red Algae 5/23/81 7/10/81 9.81co.68 103Ru=0.054*0.009 11.5 9.52 1.40*0.10 (Prionitis sp.)

95Zr=0.218*0.015

)

55 Fish 4/

56 81096 Sediment S/23/81 7/10/81 5.53*0.41 137Cs=0.016*0.005 3.59 2.98 4.90*0.36 w

56 81099 Red Algae 5/23/81 7/10/81 16.7*0.23 17.3 14.4 3.52*0.23 (Giqartina agardhii) 56 81D98 Red Algae 5/23/81 7/10/81 8.02*0.56 11.0 9.13 1.13*0.08 (Iridaea sp.)

56 81097 Red Algae 5/23/81 7/10/81 7.90*0.56 103Ru=0.073*0.014 8.28 6.87 1.34*0.09 (Prionitis sp.)

106Ru=0.244*0.064 95Zr=0.346*0.026 57 81E00 Sediment 5/23/81 7/10/81 6.15*0.t.5 137Cs=0.024*0.003 5.00 4.15 5.21*0.38 95Nb=0.011*0.003 57 81E03 Red Algae 5/23/81 7/10/81 19.7*1.3 23.5 19.5 4.04*0.27 (Gigartina agardhii) 57' 81E02 Red Al 5/23/81 7/10/81 10.3*0.71 14.0 11.6 2.07*0.14 (Iridaea sp.) gae

TABLE 2 - contd.

Report 420-81.157 l

Potassium K40 Activity Gross Beta Gross Activity in Potassium Collec-Beta Content tion Counting g,g gfg (pCilg Dr Activity (pCi/g Dry Sample)

(pCi/g Orig.

Sta Sample Description Date Date Beta Gansna,

Dry Sample)

Sample) j Sample) 57 81E01 Red Algae 5/23/81 7/10/81 8.57*0.60 95Zr=0.218*0.036 6.67 5.54 1.35*0.09 (Prionitis sp.)

95Nb=0.247*0.024 i

65 81E05 Pacific Oyster _/

5/26/81 7/10/81 7.52*0.54 103Ru=0.053*0.019 9.34 7.75 1.50*0.11 3

i (Crassostrea qiqas) 59 81E04 Gaper Clant3/

5/24/81 7/10/81 8.68*0.61 10.4 8.63 2.21*0.16 (Tresus cepex) llActivity at time of sampling. Naturally occurring radioisotopes are not reported.

2_l or K40 activity of 830 pC1/gm natural potassium.

F 3.,/ amples analyzed at DER then sent to State Department of Health.

S 4_/ ample unavailable for collection during this quarter.

E S

1 i

i TABLE 3a Report 420-81.157 RADI0 ANALYSIS OF TERRESTRIAL SAMPLES K40 Activity Potassium Gross Beta Gross Activity in Potassium-Collec-Beta Content Activity (pCi/g Dry Sample)

(pd /g D (pCi/g Orig.

tion Counting

{,g gfg Sta Sample Description Date Date Beta Gamma 1, Dry Sample)

Sample) j Sample) 1 81E58 Domestic Water _/

6/16/81 7/

7_/

3 1 81091 Soil 5/23/81 7/10/81 9.17*0.64 8_/

8.85 7.35 8.23*0.57 5 81092 Soil 5/26/81 7/10/81 5.62*0.42 8/

4.83 4.01 4.12*0.30 l

16 81C81 Milk /

4/22/81 7/10/81 8.12*0.57 5

10.4 8.64 1140*81 /

6 11 5/ 1/81 1311-<0.2 /

5 48 81079 Milk /

4/21/81 7/10/81 7.50*0.53 137Cs=5.3*0.811 6

1/

4/30/81 1311-<0.25/

8.41 6.98 1139*81 /

5 4

i llActivity at time of sampling. Naturally occurring radioisotopes are not reported.

2/ or K40 activity of 830 pCi/gm natural potassium.

F 3_/ ample is evaporated for beta analysis and distilled for H-3 analysis. H-3 activity less than 0.27 pCi/ml.

S 4/ odine-131 activity, pCi/1., at time of sampling.

l 1/pCi/1.

EI ampled jointly with the State Department of Health.

S 7/ eta activity not determined for this report. Results for this sample will be reported in the next quarterly report B

(No. 82).

8_/See Table 3b.

+

TABLE 3b Report 420-81.157 RADI0 ANALYSIS OF TERRESTRIAL SAMPLES 4

Gamma Activity Station Sample Description (pCi/g Dry Sample) 1 81091 Sail 7Be=0.530*0.093 103Ru=0.105*0.013 137Cs=0.124*0.008 1

i 95Nb=0.697*0.013 95Zr=0.336*0.019 5

81092 Soil 7Be=0.313*0.085 103Ru=0.042*0.008 106Ru=0.079*0.032 i

137Cs=0.221*0.006 l

95Zr=0.155*0.014 95Nb=0.314*0.008 g;

54Mn=0.015*0.005 i

1

)

)

l

TABLE 4 Report 420-81.157 00SIMETER MEASUREMENTS Period Start:

3/31/81 4/14/81 4/28/81 5/12/81 5/27/81 6/ 9/81 6/24/80

/28/81 5/12/81 5/27/81 6/ 9/81 6/23/81 6/23/b1 Period End:

4/14/81 4

Elapsed Time, Days:

14 14 14 15 13 14 364 2/

Station Total mR Total mR Total mR Total mR Total mR Total mR Total mR 1

1 2.8 3.5 2.8 3.6 2.3 2.7 85.4 2

3.0 2.7 3.0 3.3 2.5 3.0 81.0 3

2.8 2.9 3.0 3.1 2.7 2.8 78.7 4

3.03/

4,7 /

2.6 2.9 2.5 3.0 76.7 5

5 2.8_I 3.41/

3.3 2.8' 2.7 2.7 77.0 7

6 2.7 3.1 3.0 2.5 3.4 2.8 75.6 7

2.9 3.1 2.6 2.4 2.6 2.5 75.7 8

4.2 /

3.05/

3.4 2.8 2.5 3.0 77.4 (50) 3 l

9 4/

4.7 3.4 3.3 2.6 1.8 63.0 (42) l 10

'I. 6 3.2 2.3 2.5 2.3 2.5 72.6 i

11 2.5 )

4,95/

2.8 3.0 2.7 2.9 79.2 3

12 3.8 2.5 2.8 2.6 2.5 2.7 78.1 13 3.2 3.6 2.5 2.8 2.5 2.6 74.1 (50) 14 3.5 2.8 3.0 2.7 2.0 2.6 83.4 t'

15 2.7 3.1 2.9 3.0 2.3 2.9 85.1 16 3.1 /

3.9 /

2.9 3.7 2.8 3.2 87.0 (48) 3 5

7 5

17 3.4 /

4.7 /

2.4 2.8 2.6 2.7 75.5 18 3.8 /

2.95/

3.2 2.7 2.3 3.0 77.4 (50) 7 19 2.1 /

3.05/

3.0 2.9 3.6 3.1 78.4 1

20 2.6 I 3.61/

3.0 2.8 3.0 3.8 84.7 T

21 2.6 2.8 2.8 2.3 2.4 2.7 76.0 22 3.33/

2.65/

3.0 2.5 2.7 2.71/

79.2 23 3.0I/

4.55/

2.8 3.0 2.8 3.2 82.8 24 2.6 1 2.951 2.4 2.9 2.5 2.91/

73.1 3

25 2.7 /

2.95/

2.6 2.9 2.4 2.9 71.6 (50) 7 26 3.3 1 5.25/

2.7 3.6 3.0 2.7 79.8 7

27 4.5 /

4.95/

2.6 3.7 2.4 3.3 87.3 (50) 7 28 3.1 /

5.15/

2.8 2.6 2.5 2.5 81.5 7

29 3.57/

2.75/

3.3 3.1 3.0 2.8 76.8 (48) 30 3.2 _/

2.55/

2.6 3.1 2.5 2.8 75.0 7

1 1/Both dosimeters read 0 and/or full scale.

2/ Weeks of data, if less than 52.

)

T/ Period end 4/15/81. 4_/ Dosimeters stolen. SJPeriodbegin4/15/81. 6/ Period end 6/24/81.

l l

u

j Report 420-81.157 TABLE 5 FILM PACK MEASUREMENTS Period Start:

3/31/81 4/28/81 5/27/81 Period End:

4/28/81 5/27/81 6/23/81 Elapsed Time, Days:

28 29 27 1/

1/

1/

Station Total mR-Total mR-Total mR-1 0

0 0

2 0

0 0

3 0

0 0

4 0

0 0

5 3

0 0

6 0

0 0

7 0

0 0

8 0

0 0

9 0

0 0

10 0

0 0

11 0

0 0

g 12 0

0 0

13 0

0 0

14 0

0 0

15 0

0 0

16 0

0 0

17 0

0 0

18 0

0 0

19 0

0 0

20 0

0 0

21 0

0 0

22 0

0 02/

23 0

0 0

24 0

0 02/

25 0

0 0

26 0

0 0

27 0

0 0

28 0

0 0

29 0

0 0

30 0

0 0

l I

IJAbove backgr,ound of 8 mR/mo.

2/ Period end 6/24/81.

Report 420-81.157 l

TABLE 6 AIR PARTICULATE STATION NO. 3 GROSS BETA ACTIVITY Sample Volume Collection Counting Number (m**3)

Date Date pCi/m**3 81C42 288 4/ 7/81 4/15/81 0.390*0.025 81C62 289 4/14/81 4/20/81 0.358*0.023 81C77 281 4/21/81 5/ 2/81 0.463*0.030 81C95 281 4/28/81 5/ 5/81 0.228*0.011 81D15 282 5/ 5/81 5/10/81 0.320*0.015 81046 289 5/12/81 6/12/81 0.250*0.014 81D58 289 5/19/81 5/28/81 0.224*0.010 81087 336 5/27/81 6/ 5/81 0.179*0.010 81E15 238 6/ 2/81 6/11/81 0.159*0.014 81E29 282 6/ 9/81 6/15/81 0.146*0.005 G

81E55 283 6/16/81 7/10/81 0.072*0.005 81E83 282 6/23/81 7/10/81 0.076*0.005 81F00 283 6/30/81 7/10/81 0.052*0.003

(

Report 420-81.157 TABLE 7 AIR PARTICULATE STATION NO. 45 GROSS BETA ACTIVITY Sample Volume Collection Counting Number (m**3)

Date Date pCi/m**3 81C43 283 4/ 7/81 4/15/81 0.477*0.031 81C63 289 4/14/81 5/ 1/81 0.35350.023 81C78 281 4/21/81 5/ 2/81 0.510*0.033 81C96 286 4/28/81 5/ 5/81 0.231*0.011 81016 277 5/ 5/81 5/10/81 0.351*0.016 81047 290 5/12/81 5/21/81 0.310*0.014 81059 283 5/19/81 6/ 1/81 0.252*0.012 81088 297 5/26/81 6/10/81 0.167*0.008 81E16 280 6/ 2/81 6/11/81 0.195*0.013 E;

81E30 278 6/ 9/81 6/15/81 0.153*0.005 81E56 287 6/16/81 7/10/81 0.087*0.006 6/23/81 7/10/81 0.092*0.006 81E84 287 6/30/81 7/10/81 0.053*0.004 81F01 293 l

l l

17 Report 420- 81.157 I

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