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I'#R 3 "33I Report 420-81.50Report Issued:
PACIFIC GAS AND ELECTRIC COMPANY4
DEPARTNENT OF ENGINEERING RESEARCH
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REPORT NO. 79ENVIRONMENTAL RADIATION STUDY
IN THE VICINITY OFHUMBOLDT BAY POWER PLANT
EUREKA, CALIFORNIAQUARTER ENDING DECEMBER 31, 1980
(FALL)
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R. F. CAY 0T, Chief
Report Prepared By:
D. L. Brownriggi P. A. Szalinski
8108310233 810821PDR ADOCK 05000133R PDR
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Report 420-81.50
TABLE OF CONTENTS
Pagei
.. LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . ii
LIST OF FIGURES 11.........................
SUMMARY ........... -i................ 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAMPLE COLLECTIONS AND ANALYSES 1.................
DISCUSSION OF ANALYTICAL RESULTS . . . . . . . . . . . . . . . . . 2
RELEASES OF GASEOUS RADI0 ACTIVE WASTE 2..............
REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
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Report 420-81.50
- LIST OF TABLES
Table Page
1. Samples Collected . . . . . . . . . . . . . . . . . . . . . . 7
2. Radioanalysis of Marine Samples . . . . . . . . . . . . . . . 8
3. Radioan-lysis 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. Station Locations of Dosimeters ar,d Film Packs 15.......
3. Chronological Display of Selected Environmental Measurements 16
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Report 420-81.50
SUMMARY
Measurements of radioactivity in marine and terrestrial samples 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.
Gross beta measurements in air particulate samples increased starting
in the latter part of October. This increase is due to atmospheric
nuclear weapons testing conducted by the Peoples Republic of China on
October 16, 1980.
INTRODUCTION
This is the 70th quarterly report on radiation in the environment
near Humboldt Bay Power Plant (HBPP) covering the period September thrcugh
|December 1980. 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.l*
1
SAMPLE COLLECTIONS AND ANALYSES
,
Air particulate filters, dosimeters, film packs, and 15 marine and
| terrestrial samples were collected for this report in accordance with the
requirements of the North Coast Regional Water Quality Control Board ,32
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.i
*5ee reference page.
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2 Report 420-81.50
' Forty-one gross beta analyses, two iodine-131 analyses, and 15 gamma
isotopic analyses 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 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 17.0 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 1976 through this quarter. Reports 37,
55, and 75 contain graphs from previous years.
RELEASES OF GASE0US RADI0 ACTIVE WASTE
The routine releases of gaseous radioactive wastes have been
monitored by the air e!,ector 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.
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REFERENCES
1. Quarterly report to Regional Water Quality Control Board on LiquidWaste Discharge from Humboldt Bay Power Plant.
2. Letter from North Coastal Regional Water Quality Control Board toPGandE, Attn: F. F. Mautz, concerning modifications to wastedischarge and environmental radiation monitoring requirements, datedMay 7, 1965. _--
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3. Letter from North Coastal Regional Water Quality Control Board toPGandE, Attn: Mr. P. Matthew, concerning modifications to wastedischarge requirements, dated April 8, 1966.
4. Department of Public Health letter to PGandE, Attn: Mr. P. Metthew,concerning modifications to environmental radiation monitoringrequirements, 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.
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4 Report 420-81.50
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
Figure 1 Station Locations of Environmental Samples 14
Figure 2 Station Locations of Dosimeters and Film Packs 15
i Figure 3 Chronological Display of Selected EnvironmentalMeasurements 16
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5 Report 420-81.50
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 samp1,es 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 gamma
scan is typically 5 pCi/1 of water solution containing a single
radionuclide.
Padioiodine 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 stri,pped from the resin and after
purification is precipitated as cuprous iodide for measurements by
beta-gama 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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6 Report 420-81.50
standard deviation in the concentration units (Gaussian) is about 12
percent at the 5 ppm level. Using the factor of 830 pC1/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 scintillationw.
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 wailed 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 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 confidence level.
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TABLE 1
SAMPLES COLLECTED -
Marine Verte- Clams & Other Bottom Terres- Air Dosi ' FilmStation Flora brates Oysters Invert. Sedim. trial Partic. meter _s Packss
1 K. Salmon Picnic Area 2 6 32 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 36 Table Bluff & Clough 6 37 Col, of the Redwds 6 3
8 Hnbit H1 Rd 6 3
9 Harbor View 4 310 B St., Field Lndg 6 311 Whittier Ct 6 312 Bell Hill Rd, HH 6 3
13 Crab St. Buhne Pt 6 314 South Bay School . , ' 6 3
15 Eich Rd 6 316 Bennett Dairy 1 6 3
"17 Bassford Rd, Ridgewd 6 3
18 6418 Elk River Rd 6 3
19 Noe St 6 320 3537 Union St 6 3
21 PG&E Well 2, HH Rd 6 322 Sta B - 14th St 6 3
23 Harris St. Substa. 6 3~
N PG&E Office, Eureka 6 3
25 Irving Dr 6 326 Worthington Dr 6 327 Berta Road, 6700 6 328 Berta Road, 7200 6 3 %'
29 Vista Rd 6 3 E30 Burns Dr 6 3 345 Humboldt Substation 13 .48 Holgerson Dairy 1 355 PG&E Outfall 1 1 4,
"56 1000 ft. N Outfall 2 1 .
57 1000 ft 5 Outfall 2 1 859 Hookton Channel 1
65 Coast Oyster Co. I
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TABLE 2
! RADI0 ANALYSIS OF MARINE SAMPLES ,
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K40 Activity Gross BetaPotassiumGross Activity in Potassiumi
Content Activityi Collec- Beta: tion Counting (,g gfg (pC1/gDrff (pC1/g Orig.(pCi/g Dry Sample)
Sta Sample Description Date Date Beta Gamma-], Dry Sample) Sample)- Sample)
55 80803 Sediment 3/ 11/20/80 1/12/81 6.1210.51 137Cs=0.01610.003 2.35 1.95 5.15+0.43
55 RedAlgaeil' (Gigartinaagardhii):
I 55 80802 Red Algae 3/ 11/20/80 1/28/81 9.9610.73 137Cs=0.032+0.026 12.2 10.1 1.5610.12| (Iridaea sp.)
55 Fish 3/,i/
56 80794 Sediment 11/20/80 1/12/81 7.3410.59 137Cs=0.02010.004 6.40 5.31 6.5010.52'
: 56 807 % Red Algae 11/20/80 2/18/81 10.810.70 59Fe=0.6510.34 14.2 11.8 2.5410.16| (Gigartina agardhii) =
56 80795 Red Algae 11/20/80 1/31/81 9.2510.49 137Cs=0.01710.006 11.4 9.49 1.5610.08(Iridaea sp.)
57 80799 Sediment 11/20/80 1/12/81 5.8110.49 137Cs=0.01710.003 4.40 3.66 5.1510.43
13.4 11.2 3.4610.2257 80801 Red Algae 11/20/80 2/ 9/81 11.810.75 -
(Gigartina agardhii),_
80800 Red Al 11/20/80 1/28/81 9.3910.70 - 10.9 9.04 1.1910.0957(Iridaea sp.) gae
m.
65 80805 Pacific Oyster / 11/19/80 1/28/81 5.5610.46 137Cs=0.01110.006 6.78 5.62 1.0110.08 $3
(Crassostrea gigas) 3
59 80804 GaperClam3/ 11/20/80 2/ 9/81 6.2410.45 137Cs=0.02310.007 5.80 4.81 1.4810.11 h(Tresus capex) g;
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1/ Activity at time of sampling. Naturally occurring radioisotopes are not reported. g.~
2/For K40 activity of 830 pCi/gm natural potassium.J/ Samples analyzed at DER then sent to State Department of Health.{/Specimensunavailableforsamplingatthistime.
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TABLE 3'
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RADI0 ANALYSIS OF TERRESTRIAL SAMPLES -''
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Potassium K40 ActivityGross SetaGross Activity in PotassiumL Collec- Beta Content Activity(pCi/g Dry Sample);: tion Counting (,9gfg (nC1/gDr{j (pCi/gOrig.
Sta Sample Description Date Date Beta __ Gamma-], Dry Sample) Sample)- Sample)
, 1 80776 DomesticWater/ 11/19/80 1/12/81 11.211.63
0.7110.10_/5- - -
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1 80797 Soil 11/20/80 1/12/81 7.6110.61 137Cs=0.09410.006 3.71 0.08 7.5110.60<
:h
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i 5 80798 Soil 11/20/80 1/12/81 5.9010.50 137Cs=0.25710.011 5.32 4.42 4.2110.36
16 80681 Milk / 10/21/80 12/ 3/80 7.98+0.62 9.58 7.95 1082+84 /6 5-,
j 1/ 10/25/80-
<0.20-
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48 80680 Milk / 10/21/80 12/ 3/80 6.32+0.52 8.46 7.02 '052+87/6 5: -
| i/ 10/26/80-
<0.20-
=
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| 1/ Activity at time of sampling. Naturally occurring radioisotopes are not repor6ed.I 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 0.20 pCi/ml.:| i/ Iodine-131 activity, pCi/1., at time of sampling. '
; 5/pC1/1.
| 6/Sanpled jointly with the State Department of Health.
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TABLE 4 Report 420-81.50 .
DOSIMETER MEASUREMENTS .
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Pariod Start: 9/30/80 10/14/80 10/28/80 11/10/80 11/25/80 12/ 9/80 12/26/79Period End: 10/14/80 iO/28/80 11/10/80 11/25/80 12/ 9/80 12/23/80 12/23/80ElapsedTime, Days: 14 14 13 15 14 14 363
2/Station Total d Total d Total d Total mR Total d Total d Total mR
,
1 3.6 3.4 3.2 3.5 3.1 3.5 87.12 3.1 3.5 2.9 3.4 3.8 3.3 80.83 2.9 3.5 2.8 3.3 3.2 3.9 75.14 2.9 3.0 3.3 3.4 3.3 3.2 67.65 2.8 3.2 2.7 3.8 3.3 2.9 65.3 (48) 1
6 3.0 2.2 2.8 1.7 2.8 3.7 78.61 7 3.1 3.0 2.7 3.4 3.4 3.4 72.4
8 2.7 2.9 3.1 3.6 3.0 3.6 82.49 2.9 3.2 1.7 3/ 3/ 3.0 68.3 (46)
10 2.7 3.8 3.0 3 70 3 71 3.0 73.7 (50),
11 2.7 3.6 2.7 3.5 3.2 3.6 79.8'.
12 2.8 3.2 3.0 3.1 2.9 3.9 76.713 3.3 3.6 2.2 3.3 3.1 3.8 77.5 (50) _.
C'14 2.8 3.4 2.8 3.6 2.8 3.1 87.815 3.6 7.4 3.3 3.1 3.0 2.5 79.7 (50)16 2.4 4.0 3.2 3.7 3.8 3.5 86.9 (50)17 3.5 2.9 2.6 3.2 2.8 2.1 74.818 2.1 3.4 3.3 3.8 3.0 3.2 79.519 3.2 2.7 3.2 3.4 3.2 3.7 71.3 (50)20 3.8 3.5 3.0 4.1 3.3 3.9 78.2 (50)21 3.4 3.2 2.4 3.8 3.5 3.2 83.022 3.9 3.4 2.8 3.6 3.0 3.8 75.0 (50)23 3.9 2.0 2.4 4.6 3.1 4.3 82.5 (50)24 3.2 2.8 2.2 3.6 :.2 3.8 73.1 :o25 2.3 5.0 2.9 2.3 3,0 3.4 76.4 426 2.1 1.9 3.3 3.9 2.9 3.1 74.5 8
"27 2.6 2.8 3.4 4.8 3.6 3.6 89.2 (50)28 3.4 3.2 2.9 3.5 3.3 3.8 74.3 029 2.7 3.9 2.8 3.5 2.9 1/ 74.3 (50) ?30 3.3 2.0 3.1 3.6 3.4 175 73.0 5
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1]Both dosimeters read 0 and/or full scale. 2/ Weeks of data, if less than 52. 3/ Dosimeters stolen.
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11 Report 420-81.50'
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Report 420-81.50
TABLE 6
AIR PARTICULATESTATION NO. 3 GROSS BETA ACTIVITY
Sample Volume Collection CountingNumber (m**3) Date Date pC1/m**3
80653 275 10/ 7/80 3/25/81 0.035+0.00280670 288 10/14/80 10/27/80 0.031Tb.00280678 284 10/21/80 3/25/81 0.04970.00380703 295 10/28/80 11/ 4/80 0.073TD.005
! .079T0.00580721 282 11/ 4/80 11/10/80 080738 241 11/10/80 11/19/80 0.214T0.01480755 323 11/18/80 12/ 1/80 0.112TO.008 _,
80810 267 11/25/80 12/12/80 0.123TD.012 "'
80829 285 12/ 2/80 12/13/80 0.14076.01080841 281 12/ 9/80 12/16/80 0.152ib.01080849 284 12/16/80 1/23/81 0.243Tb.01180879 294 12/23/80 1/ 5/81 0.19076.013
0.223;0.01580894 286 12/30/80 1/ 7/81 1
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I YABLE 7|
AIR PARTICULATEj STATION NO. 45 GROSS 8 ETA ACTIVITY
Sample Volume Collection CountingNumber (m**3) Date Date_ pC1/m**3'
; 80654 419 10/ 7/80 1/23/81 0.031+0.00280671 440 10/14/80 10/22/80 0.02870.002'
80679 414 10/21/80 1/23/81 0.044T0.002;'
80704 442 10/28/80 11/ 4/80 0.05770.00480722 427 11/ 4/80 11/12/80 0.07670.00580737 370 11/10/80 11/19/80 0.134T0.00980756 479 11/18/80 12/ 1/80 0.09070.00680811 395 11/25/80 12/12/80 01095T0.00680830 432 12/ 2/80 12/15/80 0.'135T0.00980842 424 12/ 9/80 12/16/80 0.127T0.0084
,i
j 80850 416 12/16/80 1/23/81 0.21070.010 w
80880 431 12/23/80 1/ 5/81 0.16670.011! 80895 433 12/30/80 1/ 6/81 0.190T0.012
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ENVIRON'tENTAL SAMPLES
ENVIRONMENTAL RADIATION STUDYIN THE VICINITY OF HUMBOLOT SAY POWER PLANT
PACIFIC GAS AND ELECTRIC COMPANY-
9 ! e s 4 a eum
Figure 1
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DOSIMETERS & FILM PACKSENVIRONMENTAL fiADIATION STUDY
( IN THE VICINITY OF HUMBOLDT BAY POWER PLANTPACIFIC GAS AND ELECTRIC COMPANY
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