ML19296D544

Rept Number 73,Environ Radiation Study in Vicinity of Facility,Eureka,Ca,Quarter Ending June 30,1979 (Spring)

ML19296D544
Person / Time
Site:	Humboldt Bay
Issue date:	12/14/1979
From:	Brownrigg D, Cayot R, Lorenz R PACIFIC GAS & ELECTRIC CO.
To:
Shared Package
ML19296D541	List: ML19296D540 ML19296D543 ML19296D544 ML19296D545
References
420-79.85, NUDOCS 8003050221
Download: ML19296D544 (19)

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{{#Wiki_filter:. ~. Report Issued: DEC Report 420-79.85 PACIFIC GAS AfiD ELECTRIC COMPANY DEPARTMENT OF ENGINEERING RESEARCH REPORT NO. 73 ENVIRONMENTAL RADIATION STUDY IN THE VICINITY OF huMBOLDT BAY POWER PLANT EUREKA, CALIFORNIA QUARTER ENDING JUNE 30, 1979 (SPRING) 1 ;; / $g...> il / C F. CAfGT,iChief j Report / Prepared By:

0. L. Brownrigg R. W. Lorenz 899%SQLL-

Report 420-79.85 TABLE OF CONTENTS Page LIST OF TABLES.......................... ii LIST OF FIGURES.......................... ii

SUMMARY

1 INTRODUCTION........................... 1 SAMPLE COLLECTIONS AND ANALYSES.................. 1 DISCUSSIONLOF ANALYTICAL RESULTS................. 2 RELEASES OF GASEOUS RADI0 ACTIVE WASTE............... 2 REFERENCES............................ 3 APPENDIX 4 i

Report 420-79.85 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. F i lm P ac k Me a su remen ts................. 11 6. Air Particulate, Station No. 3, Gross Beta Activity..... 12 7. Air Particulate, Station No 45, Eross Beta Activity..... 13 LIST OF FIGURES Figure Page 1. Station Locations of Environmental Samples.......... 14 2. Station Locations of Dosimeters and Film Packs........ 15 3. .nronological Display of Selected Environmental Measurements. 16 il

Report 420-79.85

SUMMARY

Measurements of radioactivity in marine and terrestrial samples and in air particulates from the environment near the Humboldt Bay Power Plant du -ng 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 73rd quarterly report on radiation in the environment near Humboldt Bay Power Plant (H3PP) covering the period A.pril through June 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 Steam Generation. Information on the release of liquid radioactive waste from HBPP is reported elsewhere.1* SAMPLE CDLLECTIONS AND ANALYSES Air particulate filters, dosimeters, film packs, and 16 marine and terrestrial samples were collected for this report in accoraance with the 2' requirements of the North Coast Regional Water Quality Control Board '" and the Departnent of Health.4 A table or tne s 2.cles collected and maps showing the sampling locations (Figures 1 and 2) are presented in the Appendix. "See reference page.

2 Report 420-79.85 Forty-two gross beta analyses, two iodine-131 analyses, and 16 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 HSPP 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 27. The total annual exposure at Station 27 was approximately 19.3 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 1975 through this quarter. Reports 37 and 55 contain graphs from previous years. REEASES UF BASEOUS RADIDACTIVE 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 an 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.

3 Report 420-79.85 REFERENCES 1. Quarterly report to Regional Water Quality Control 30ard 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 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

4 Report 420-79.85 APPENCIX Page Methods of Sample Collection and Analysis 6 Table 1 Samples Collected 8 Table 2 Radioanalysis of Marine Samples 9 Table 3 Radioanalysis of Terrestrial Samples 10 Table 4 Dosimeter Measurements 11 Table 5 Film Pack Measurements 12 Table 6 Air Particulate, Station No. 3, Gross Beta Activity 13 Table 7 Air Particulate, Station No. 45, Gross Beta Activity 14 Figure i Station Locations of Environmental Samples 15 Figure 2 Station Locations of Dosimeters and Film Packs 16 Figure 3 Chronological Display of Selected Environmental Measurements 17

5 Report 420-79.85 METHODS OF SANPLE 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 tne 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 cf a - standard containing X-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 eignt days of coilection. Following addition of stable iodine to the raw milk to determine chemical recovery, iodine is separated from the miit by using anion ion exchange resin. Iodine is stripped from the resin and after purification is precipitated as cuprous iodide for measurements by beta-gamma coincidence counting. The detection limit attained by this mechod is typical:, 0.2 pCi/ liter for I-131. The potassium coatent of most of the freeze-driec samples it measured oy flame photometry in order to : stimate the K JO con:ribution to the gross activities. The range of concentrations used is one to ten ppm; the

6 Report 420-79.85 standard deviation in the conc.entration 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 demestic 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 lom; 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 hours after collection to allow for naturally occurring short-lived radionuclides to decay. Gamma dosimetry is performed with two icn chambers (Victoreen, Model 2 9) 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 nomally reported since the dosimeters normally read high on failure. The Radiation Detection Company (ROC), Sunnyvale, California, supplies and reats 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 confidence level.

TABLE 1 Report 420-79.85 SAMPLES COLLECTED Marine Verte-Clams & Other Bot'.om Terres-Air Dosi-Film Statico Flora brates O_ysters Invert. Sedim. trial Partic. meters Packs 1 K. Salmon Picnic Area 2 6 3 2 1742 Wood, Fortuna 6 3 3 Humboldt Hill (HH) Rd 13 6 3 4 Wood & K, Eureka 6 3 5 Redwood Ave, Arcata 1 6 3 6 Table Bluff & Clough 6 3 7 Col. of the Rei ds 6 3 8 Hmblt HI Rd Mr Donna 6 3 9 IIH Rd Ur Harbor View 6 3 10 B St., Field Lndg 6 3 11 to.ittier Ct & Irving 6 3 12 Bell Hill Rd, tiH 6 3 13 Crab S t, Buhr.e P t 6 3 14 South Bay School 6 3 15 Eich Dr, HH 6 3 16 Bannett Dairy 1 6 3 17 Bassford Rd, Ridgewd 5 3 18 6418 Elk River Rd 6 3 19 Mac St, Pine Hill 6 3 20 Jacobs Jr. H.S. 0 0 21 PG&E Well 2, H:1 Rd 6 3 22 St3 B - 14th St 6 3 23 Harris St. Sohsta. 6 3 24 PGhF Of f ice, Enr eka 6 3 25 irring De, 1111 6 3 26 Worthir.gton in, HH 6 3 27 Berta Road 6 3 28 Certa Road 6 3 29 Vista Rd, liH 6 3 30 Burns Dr, HH 6 45 Humboldt Substation 13 48 Holgerson Dairy 1 55 PG2.E Outfall 1 1 1 56 1000 ft. N Outfall 2 1 57 1000 ft. S Outfall 2 1 59 Hookton Channel 1 65 Coast Oyster Co. 1

TABLE 2 Report 420-79.85 RADIONIALYSIS OF MARINE SAMPLES K40 Activity Potassium Gross Beta in P tassium Gr ss Activity Content Activity Collet-Beta t i ori Counting - (pCi/oDrvSanglel (mg K/g (pCi/gDr{j (pCi/g Ori Sta Samp1_e Description Date Date Beta Gamma-DrySamplel Sample)- Sag 1g 3 3.26 2.71 5.2210.54 55 79213 Sedimen L / 4/25/79 6/ 7/79 5.9710.62 3 8.68 7.20 1.3510.11 55 79219 Red Algae / 4/25/79 6/18/79 11.P10.91 (Irigga sp.) 55 79220 Fish 3/ 5/10/79 6/28/79 15.010.87 137-Cs 0.05510.021 14.5 12.0 3.1610.18 3.16 2.62 6.4510.59 56 79223 Sediment 4/23/79 6/ 7/79 7.7410.71 13.1 10.9 2.63+0.19 56 79222 Red Algae 4/23/79 6/18/79 13.4+0.99 (G M tina ajardhii) 10.1 8.42 1.4310.11 56 79221 Red Algae 4/23/79 6/15/79 10.910.87 (Iridaea sp.) 57 79226 Sediment 4/28/79 6/ 7/79 5.39+0.62 137-Cs 0.011+0.006 3.49 2.90 5.22+0.61 10.4 8.62 2.73+0.17 57 79225 Red Algae 4/25/79 7/18/79 12.210.78 (Gigar_t_i na aqardi i_i_) t 10.0 8.30 1.4210.11 57 79224 Red Algae 4/25/79 6/15/79 10.810.88 (Iridaea sp.) 3 65 79228 Pacific Oyster / 4/30/79 6/15/79 7.781 52 6.74 5.59 1.6310.11 0 (Crassostrea gi_qas) 59 79227 Gaper Clard/ 4/28/79 6/15/79 8.8310.55 5.75 4.77 1.5910.10 (Tresus capex) _I./ 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.

TABLE 3 Report 420-79.85 RADI0 ANALYSIS OF TERP.ESTRIAL SAMPLES K40 Activity Cross Beta Potassium in Potassium Gross Activity Content Activity Callec-Beta (pCi/g Dry Sample) (pCi/g Dr tion Counting (mg K/g ( Ci/g Orig. Gama1p Dry Sample) Sample) j Sample) St Sample Descrigtion Date Date Beta 1 79193 Domestic Water / 5/ 8/79 7/20/79 14.512.78 C.66+0.11 / 5 4.33 3.59 6.82+0.62 1 79216 Soil 4/28/79 6/ 7/79 7.2210.66 4.29 3.55 7.90+0.63 5 79217 Soil 5/10/79 6/ 7/79 9.06+0.72 8.42 6.99 1327+705/ 16 79205 Milk 5/ 5/15/79 6/ 1/79 10.4+0.55 7.20 3/ 5/21/79 0 48 79205 Milks / 5/15/79 6/ l/79 9.12+0.52 7.74 6.47 1337+765/ S/ 5/22/79 70.20 1/ Activity at time of sampling. Naturally occurring radioisotopes are not reported. 2/For K40 activity of 830 pCi/g.n natural potassium. 3/ Sample is evapo. ated for t; eta analjsts and distilled for H-3 analysis. H-3 activity less than 0.20 pCi/ml. S/ lodine-131 activity, pCi/1., at time of sampling. 5/pCi/1. S/Saapled jointly with the State Department of Health.

TABLE 4 Report 420-19.85 DOSIMElER MEASUREMENTS Period Start: 4/ 3/79 4/17/79 5/ 1/79 5/16/79 5/30//9 6/12/79 6/26/78 Period End: 4/17/79 5/ 1/79 5/16/79 5/30/79 6/12/79 6/26/79 6/26/79 Elapsed Time, Days: 14 14 15 14 13 14 365 Station Total mR Total _ mR Total n.R Total mR Total nR Total mR Total nR -2/ 1 2.6 3.0 5.2 2.8 2.4 3.2 71.7 (46) 2 2.7 2.8 2.8 3.0 3.1 2.7 76.3 3 2.8 2.8 2.8 2.8 2.7 2.5 75.0 4 2.5 2.5 2.5 2.8 2.7 2.8 73.9 5 3.0 2.7 2.8 2.4 2.6 2.8 74.4 6 2.8 2.9 3.0 3.8 3.5 3.0 85.0 7 2.6 2.8 2.7 2.7 2.8 2.6 72.1 8 3.0 2.8 3.2 3.0 3.2 2.7 78.9 (50) 9 3.3 3.4 2.7 3.9 3.4 2.8 82.9 10 2.8 3.0 2.7 2.7 2.3 2.7 73.1 11 2.5 3.0 2.5 3.5 2.I 2.8 76.9 12 2.5 2.6 3.0 3.4 2.3 2.8 83.1 13 2.4 3.2 2.5 2.8 2.2 2.4 71.9 14 2.3 2.6 3.5 3.0 3.0 2.5 78.6 c) 15 2.6 3.8 2.9 2.3 2.8 2.4 79.6 16 3.0 3.1 3.4 4.0 3.2 3.2 93.1 17 2.6 3.0 3.0 2.9 1/ 2.8 73.8 (50) 18 2.6 2.7 2.9 3.6 3.5 4.8 83.0 19 2.5 2.8 3.1 3.1 2.9 3.0 74.5 (50) 20 3/ 3/ 3/ 3/ 3/ 3/ 53.5 (34) 21 3.0 2.7 3.0 2.6 2.3 Y.5 77.6 22 2.6 2.5 3.0 3.0 3.4 2.6 80.3 23 2.8 2.9 2.7 2.9 2.7 3.9 83.5 24 2.3 2.7 2.5 2.6 2.2 2.7 69.7 (50) 25 2.5 2.5 2.7 2.5 2.7 2.2 71.3 26 2.6 2.6 2.7 2.8 2.5 2.8 66.5 (46) 27 3.4 2.8 2.9 3.5 3.0 3.6 94.6 28 2.5 2.8 2.3 2.5 2.3 2.5 73.4 (48) 29 2.2 2.6 3.1 2.5 2.5 2.8 80.8 30 2.6 2.7 3.0 2.9 2.2 2.5 72.7 (50) l/Both dosimeters read 0 and/or full scale. 2/ Weeks of data, if less than 52. 3/No measurement.

Report 420-79.85 TABLE 5 FILM PACK MEASUREMEriTS Period Start: 4/ 3/79 5/ 1/79 5/30/79 Period End: 5/ 1/79 5/30/79 6/26/79 Elapsad Time, Days: 28 29 27 1 1 1 Total mR / Total _ rrR / Total trR / 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 C 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/ 2/ 2/ 21 0 U 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 .1/Above background of 8 mR/mo. 2/flo measurement.

Report 420-79.85 TABLE 6 AIR PRRTICULATE STATION NO. 3 GROSS BETA ACTIVITY Sample Volume Collection Cnunting Number (m**3) _ _Date Date gC_i/m**3 79162 281 4/10/79 4/23/79 0.026+0.002 79163 289 4/17/79 4/24/79 0.030T0.002 79179 283 4/24/79 b/ 2/79 0.027TO.002 791E3 276 5/ 1/79 5/ 4/79 0.026TO.003 79192 286 5/ 8/79 5/10/79 0.020TO.002 79210 334 5/16/79 5/24/79 0.02170.002 79229 242 5/22/79 5/24/79 0.023TO.002 79241 320 5/30/79 6/ 5/79 0.029T0.002 79245 246 6/ 5/79 6/ 6/79 0.058TO.004 7927/ 293 6/12/79 6/18/79 0.015TO.002 792S5 276 6/19/79 6/21/79 0.025TO.002 79293 285 6/26/79 7/23/79 0.013TO.001 79309 287 7/ 3/79 7/17/79 0.021T0.002 e

Report 420-79.85 TABLE 7 AIR PARTICULATE STATION NO. 45 GROSS BETA ACTIVITY Sample Volume Collec tion Counting 5pbar in*

• 3J Date Date pCi/m**3 79163 428 4/10/79 4/23/79 0.030+0.002 79169 422 4/17/79 4/25/79 0.026+0.001 791SO 432 4/24/79 5/ 2/79 0.025T0.002 79189 422 5/ 1/79 5/ 7/79 0.030TO.003 79193 424 5/ 8/79 5/10/79 0.02170.002 79211 491 5/16/79 5/24/79 0.025TO.001 79230 375 5/22/79 5/25/79 0.026TO.002 79242 483 5/30/79 6/ 5/79 0.0?5T0.002 79216 365 6/ 5/79 6/ 6/79 0.0? 9TO.003 79278 434 6/12/79 6/18/79 0.01670.001 792E6 420 6/19/79 6/21/79 0.02170.002 79299 430 6/26/79 7/12/79 0.014T0.001 79310 427 7/ 3/79 7/17/79 0.022+0.002

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