ML19296D545
| ML19296D545 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 12/26/1979 |
| From: | Brownrigg D, Cayot R, Lorenz R PACIFIC GAS & ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19296D541 | List: |
| References | |
| 420-79.127, NUDOCS 8003050228 | |
| Download: ML19296D545 (19) | |
Text
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w Report Issued:
Report 420-79.127 PACIFIC GAS AND ELECTRIC COMPANY DEPARTMENT OF ENGINEERING RESEARCH REPORT NO. 74 ENVIRONMENTAL RADIATION STUDY IN THE VICINITY OF HUMBOLDT BAY POWER PLANT EUREKA, CALIFORNIA QUARTER ENDING SEPTEMBER 30, 1979 (SUMMER)
W A
74 R. F. CAY 0T, Chief Report Prepared By:
O. L. Brownrigg R. W. Lorenz no03050
Report 420-79.127 TABLE OF CONTENTS Page LIST OF TABLES..........................
ii LIST OF FIGURES..........................
ii
SUMMARY
1 INTRODUCTION...........................
1 SAMPLE COLLECTIONS AND ANALYSES 1
DISCUSSION OF ANALYTICAL RESULTS.................
2 RELEASES OF GASE0US RADI0 ACTIVE WASTE...............
2 REFERENCES............................
3 APPENDIX..
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M Report #20-79.127 LIST OF TABLES Table Page 1.
Samples Collected......................
7 2.
Radioanalysis of Marine Samples...............
8 3.
Radioanalysis of Terrestrial Samples.............
9 4.
Dosimeter Measurements....................
10 5.
Film Pack Measurements....................
11 6.
Air Particulate, Station No. 3, Gross Beta Activity.....
12 7.
Air Particulate, Station No. 45, Gross Beta Activity.....
13 LIST OF FIGURES Figure Page 1.
Station Locations of Environmental Samples..........
14 2.
Stetion Locations of Dosimeters and Film Packs........
15 3.
Chronological Display of Selected Environmental Measurements.
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Report 420-79.127
SUMMARY
Measurements of radioactivity in marine and terrestrial samples and in air particulates from the environment near the Humboldt Bay Power Plant during this quarter generally remained within the range of preoperational background measurements.
The maximum integrated dose measured was well below the permissible contribution of 500 mrem / year in unrestricted areas.
INTRODUCTION This is the 74th quarterly report on radiation in the environment near Humboldt Bay Power Plant (H3PP) covering the period July through September 1979.
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 Department of. team Generation.
Information on the release of liquid radioactive wiste from HBPP is reported elsewhere.1*
SAMPLE COLLECTIONS AND ANALYSES Air porticulate filters, dosimeters, film packs, and 17 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
and the 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.
- See reference page.
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Report 420-79.127 Forty-three gross beta analyses, two iodine-131 analyses, and 19 gamma scans were performed for this report. The results are tabulated in the Appendix. All samples except the dosimeters and film packs were analyzed at the Department of Engineering Research (DER). Dosimeters were read by HBPP 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 preoperatinal activity levels of similar samples.5 During the preceding 52-week period, the maximum integrated radiation exposure was measured at Station 27. The total annual exposure at Station 27 was approximately 22.0 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 1975 through this quarter.
Reports 37 and 55 contain graphs from previous years.
RELEASES OF GASEOUS RADI0 ACTIVE WASTE 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, maintenance, and station modification outage which started in July 1976, continued through this quarter; therefore, airborne releases were insignificant.
V 3
Report 420-79.127 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. Mautz, concerning modifications to waste discharge and environmental radiation monitoring requirements, dated May 7, 1965.
3.
Letter from North Coastal Regional Water Quality Control Board to PGandE, Attn:
Mr. P. Matthew, concerning modifications to waste discharge requirements, dated April 8,1966.
4.
Department of Public Health letter to PGa.idE, Attn:
Mr. P. Matthew, concerning modifications to environmental adiation monitoring requirements, dated June 17, 1966.
5.
Environmental Radiation in the Vicinity of Humboldt Bay Power Plant, Reports 1-0.
6.
Code of Federal Regulations, Title 10, Para. 20.105.
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4 Report 420-79.127 APPENDIX Page Methods of Sample Collection and Analysis 5
Table 1 Samples Collected 7
Table 2 Radioanalysis of Marine Samples 8
Table 3 Radioanalysis of Terrestrial Samples 9
Table 4 Dosimeter Measurements 10 Table 5 Film Pack Measurements 11 Table 6 Air Particulate, Station No. 3, Gross Beta Activity 12 Table 7 Air Particulate, Station No. 45, Gross Beta Activity 13 Figura 1 Station Locations of Environmental Samples 14 Figure 2 Station Locations of Dosimeters and Film Packs 15 Figure 3 Chronological Display of Selected Environmental Measurements 16 timr
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Report 420-79.127 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.-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 and multichannel pulse height analyzer. The limit of detectability attained in the gamma scan is typically 5 pCi/l of water solution containing a single radionuclide.
Radiciodine analyses are performed on milk samples within eight dav-of collection. Following addition of stable iodine to the raw milk.o determine chemical recovery, iodine is separated from the milk by using anion ion exchange resin.
Iodine is stripped from the resin and after w
purification is precipitated as cuprous iodide for measurements by beta-gamma 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
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Report 420-79.127 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 95 percent conridence level.
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f TABLE 1 Report 420-79.127 SAMPLES COLLECTED v
Marine Verte-Clams & Other Bottom Terres-Air Dosi-Film Station Flora brates Oysters Invert.
Sedim.
trial Partic. meters Packs 1 K. Salmon Picnic Area 2
7 3
7 3
2 1742 Wood, Fortuna 3 Humboldt Hill (HH) Rd 13 7
3 7
3 4 Wood & K, Eureka 5 Redwood Ave, Arcata 1
7 3
7 3
6 Table Bluff & Clough
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3 7 Col. of the Redwds 7
3 8 Hmblt H1 Rd 7
3 9 Harbor View 7
3 10 B St., Field Lndg 7
3 11 Whittier Ct 7
3 12 Bell Hill Rd, HH 7
3 13 Crab St, Buhne Pt 7
3 14 South Bay School 7
3 15 Eich Rd 1
7 3
16 Bennett Dairy y
7 3
17 Bassford Rd, Ridgewd 7
3 18 6418 Elk River Rd 7
3 19 Noe St 5
3 20 3537 Union St 7
3 21 PG&E Well 2, HH Rd 7
3 22 Sta B - 14th St 7
3 23 Harris St. Substa.
7 3
24 PG&E Office, Eureka 7
3 25 Irving Dr 7
3 26 Worthington Ln 7
3 27 Berta Road, 6700 7
3 28 Berta Road, 7200 7
3 29 Vista Rd 7
3 30 Burns Dr 45 Humboldt Substation 13 1
48 Holgerson Dairy 55 PG&E Outfall 2
1 1
56 1000 ft. N Outfall 2
1 57 1000 ft. S Outfall 2
1 59 Hookton Channei 1
65 Coast Oyster Co.
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TABLE 2 Report 420-79.127 RADI0 ANALYSIS OF MARINE SAMPLES 0 Ac W ity Gross Beta Potassium in Potassium Activity Content Activity Collec-Beta tion Counting (mg K/g (pCi/gDrjj
( Ci/g Orig.
(pCi/g Dry Sample)
Sta Sample Description Date Date Gross Beta Gama Isotopiclj Dry Sample)
Sample)-
Sample) 55 79387 Sediment 3/
7/25/79 9/11/79 5.8510.60 4.22 3.50 5.2010.53 55 79388 Red Algae 7/25/79 9/25/79 9.46+0.66 11.4 9.46 2.8710.20 (Gigartina aoardhii) 55 79389 Red Algae 3/
7/25/79 9/25/79 8.5610.73 10.0 8.3 1.8010.15 (Iridaea sp.)
55 79390 Fistt3/
8/12/79 9/25/79 9.66+0.65 137Cs 0.041+0.02 9.54 7.92 2.32+0.16 (Striped Perch) 56 79391 Sediment 7/23/79 9/11/79 6.16+0.55 137Cs 0.014+0.G07 5.12 4.25 5.15+0.46 56 79392 Red Algae 7/23/79 9/25/79 11.310.83 12.5 10.4 2.4310.18 co (Gigartina agardhii) 56 79393 Red Algae 7/23/79 10/ 4/79 8.14+0.69 10.1 8.42 1.6010.14 (Iridaea sp.)
57 79394 Sediment 7/23/79 9/11/79 5.01+0.51 3.38 2.81 4.53+0.46 57 79395 Red Algae 7/25/79 10/24/79 11.910.85 12.9 10.7 2.5610.18 (Gigartina agardhii) 57 79396 Red Algae 7/25/79 10/24/79 7.0610.68 9.65 8.01 1.3110.13 (Iridaea sp.)
65 79398 PacificOysteMI 8/21/79 9/25/79 5.9910.51 6.40 5.31 1.0510.09 (Crassostrea gigas) 59 79397 Gaper Clam 3/
7/21/79 10/ 2/79 7.5710.54 6.57 5.45 2.1210.15 (Tresus capex) 1/ Activity at time of sampling.
Naturally occurring radioisotopes are not reported.
2/For K40 activity of 830 pCi/gm natural potassium.
3_/ Samples analyzed at DER then sent to State Department of Health.
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TABLE 3 Report 420-79.127 RADI0 ANALYSIS OF TERRESTRIAL SAMPLES Potassium
$0 Activity Gross Beta Activity I"
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Collec-Beta Content Activity (pCi/g Dry Sample)
(pCi/g Dr tion Counting (mg K/g (pCi/g Orig.
Sta Sample Description Date Date Gross Beta GammaIsotopicdj Dry Sample)
Sample) 7 Sample) 1 79431 Domestic WaterSI 9/11/79 10/23/79 14.5+1.4 1.14+0.12E/
1 79385 Soil 7/23/79 9/10/79 7.10+0.59 137Cs 0.J43+0.0ll 5.04 4.18 6.93+0.57 5 79386 Soil 7/23/79 9/11/79 9.07+0.96 137Cs 0.526+0.013 5.05 4.19 8.34+0.88 134Cs 0.018 0.007 16 79416 Milk 6/
9/11/79 10/ 3/79 7.08+0.65 7.79 6.47 969+89E/
4/
9/14/79
<0.20 48 79417 Milk 5/
9/11/79 10/ 3/79 7.85+0.68 9.86 8.18 1061+91E/
4/
9/15/79
<0.20 l/ Activity at time of sampling.
Naturally occurring radioisotopes are not reported.
2/For K40 activity of 830 pCi/gm natural potassium.
3/ Sample is evaporated for beta analysis and distilled for H-3 analysis.
H-3 activity less than 0.35 pCi/ml.
4_/ lodine-131 activity, pCi/1., at time of sampling.
E/pCi/1.
5/ ampled jointly with the State Department of Health, S
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t TABLE 4 Report 420-79.127 DOSIMETER MEASUREMENTS Period Start:
6/26/79 7/10/79 7/24/79 8/ 7/79 8/22/79 9/ 4/79 9/19/79 10/ 3/78 Period End:
7/10/79 7/24/79 8/ 7/79 8/22/79 s/ 4/79 9/19/79 10/ 2/79 10/ 2/79 Elapsed Time, Days:
14 14 14 15(16)SI 13(12)El 15 13 364 Station Total dl Total mR Total mR Total mR Total mR Total mR Total mR Total mR
-2/
1 2.6 2.7 3.2 3.5 2.5 3.4 3.0 73.0 46 2
2.8 2.9 3.0 (2.9)
(2.9) 3.0 3.2 77.1 3
2.9 2.4 2.9 3.2 2.5 3.3 3.0 75.3 4
3.2 2.5 2.3 2.8 3.0 3.4 3.0 74.9 5
2.8 2.7 2.8 3.0 2.6 3.2 3.4 75.1 6
2.9 2.8 2.8 (3.5)
(2.5) 3.0 3.0 85.7 7
2.8 2.3 2.9 (2.6)
(2.5) 3.2 3.0 73.0 8
2.8 2.7 2.7
( 2.4 )
(2.3) 3.2 2.9 77.8 50 9
2.7 2.4 2.8 (2.7)
(2.2) 2.6 2.5 81.4 10 2.3 2.5 2.4 (2.8)
(2.7) 2.6 2.6 72.4 11 2.7 2.5 2.6 (2.5)
(2.3) 3.0 2.8 75.5 12 2.3 2.5 2.5 2.5 2.0 2.6 2.6 79.8 13 2.8 2.2 2.1 2.6 2.1 3.0 2.9 72.3 14 2.8 2.3 2.4 3.0 2.2 2.6 2.9 74.9 15 2.8 2.7 2.8 3.2 2.7 2.9 2.7 79.4 16 3.9 3.5 3.2 3.4 4.2 3.4 3.1 94.2 17 2.7 2.8 3.0 2.9 2.7 3.0 3.2 74.0 50 18 2.8 2.7 2.9 3.3 2.8 5.1 3.0 85.6 19 2.7 2.8 3.0 2.9 2.8 3.4 2.9 74.7 50 20 3/
3/
3.0 4.7 1.0 3.8 3.9 46.5 32 21 2.3 2.5 2.7 2.6 2.6 3.0 2.8 74.2 22 3.1 2.8 2.7 3.0 2.6 3.6 2.9 80.3 23 2.9 2.5 2.9 2.9 2.9 3.9 3.3 82.9 24 2.5 3.0 2.8 2.6 2.5 2.5 2.8 72.8 51 25 2.7 2.2 2.4 (2.A)
(2.3) 3.0 2.7 71.1 26 2.5 2.7 2.4 (2.7)
(2.0) 2.4 2.8 64.0 27 4.7 3.2 2.7 3.4 3.6 4.5 3.6 98.1 28 3.0 3.4 2.4 2.5 2.6 3.2 3.0 74.7 29 3.0 3.0 2.8 (3.1)
(2.6) 3.0 2.7 80.4 30 2.5 2.6 2.8 (3.0)
(2.6) 2.9 3.0 77.0 51 1/Both aosimeters read 0 and/or full scale.
2/ Weeks of data, if less than 52.
3/ Station being
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4fNumbers in parentheses represelit doses from 8/7/79 to 8/23/79.
5]Numbersin parentheses represent doses from 8/23/79 to 9/4/79.
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Report 420-79.127 TABLE 5 FILM PACK MEASUREMENTS Period Start:
6/26/79 7/24/79 8/22/79 Period End:
7/24/79 8/22/79 10/ 2/79 Elapsed Time, Days:
28 29 41 1
1 l/
Total mr/
Total mR /
Total mR-Station 1
0 0
0 2
0 0
0 3
0 0
0 4
0 0
0 5
0 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
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
-2/
0 0
21 0
0 0
22 0
0 0
23 0
0 0
24 0
0 0
25 0
0 0
26 0
0 0
27 0
0 0
28 0
0 0
29 0
0 0
30 0
0 0
}/Above background of 8 mR/mo.
2/No measurement.
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Report 420-79.127 TABLE 6 AIR PARTICULATE STATION NO. 3 GROSS BETA ACTIVITY Sample Volume Collection Counting Number (m**3)
Gate Date pCi/m**3 79305 286 7/10/79 7/16/79 0.014+0.001 79316 286 7/17/79 7/19/79 0.028TO.003 79330 288 7/24/79 7/26/79 0.019T0.002 79335 288 7/31/79 8/ 2/79 0.020TO.002 79344 289 8/ 7/79 8/14/79 0.018T0.002 79356 282 8/14/79 8/17/79 0.025TO.003 79370 320 8/22/79 8/28/79 0.017T0.001 79381 251 8/28/79 8/30/79 0.027TO.002 N
79400 279 9/ 4/79 9/10/79 0.017TO.002 79421 287 9/11/79 9/13/79 0.03870.003 79436 326 9/19/79 9/24/79 0.044TO.003 79445 249 9/25/79 10/ 2/79 0.035T0.003 79458 279 10/ 2/79 10/ 5/79 0.030 0.003
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t Report 420-79.127 TABLE 7 AIR PARTICULATE STATION NO. 45 GROSS BETA ACTIVITY Sample Volume Collec tion Counting Number (m**3)
Date Date pCi/m**3 79306 134 7/10/79 7/16/79 0.013+0.001 79317 423 7/17/79 7/19/79 0.023T0.002 79331 432 7/24/79 7/30/79 0.015TO.001
/9336 427 7/31/79 8/ 3/79 0.018TO.001 79345 428 8/ 7/79 8/14/79 0.017TO.001 79357 430 8/14/79 8/17/79 0.026T0.003 79371 488 8/22/79 8/28/79 0.015TO.001 79382 368 8/28/79 8/30/79 0.03170.002 C
79401 421 9/ 4/79 9/10/79 0.01670.001 79422 426 9/11/79 9/17/79 0.020TO.002 79437 498 9/19/79 9/24/79 0.041T0.002 79446 362 9/25/79 10/ 2/79 0.036TO.002 79459 421 10/ 2/79 10/ 5/79 0.040 0.003
Report 420-79-127 14
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