ML20054M137
| ML20054M137 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/30/1982 |
| From: | SAN DIEGO GAS & ELECTRIC CO., SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML13325A870 | List: |
| References | |
| NUDOCS 8207090291 | |
| Download: ML20054M137 (38) | |
Text
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SUPPLEMENT TO THE ANNUAL OPERATING REPORT SAN ON0FRE NUCLEAR GENERATING STATION UNIT 1 For 1981 RADIOLOGICAL ENVIRONMENTAL MONITORING EVALUATION
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Southern California Edison Company San Diego Gas and Electric Company Docket No. 50 206 License No. DPR 13 June 30,1982
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SUPPLEMENT TO THE ANNUAL OPERATING REPORT SAN ON0FRE NUCLEAR GENERATING STATION UNIT 1 c
FOR 1981 RADIOLOGICAL ENVIRONMENTAL MONITORING EVALUATION O
Southern California Edison Company San Diego Gas and Electric Company Docket No. 50-206 License No. DPR-13 June 30, 1982
s i
TABLE OF CONTENTS Page L i s t o f F i gu re s....................................................
i ListofTables.....................................................
iii Assessment of Radiological Impact of Plant Operation o n t h e E n v i r o n me n t.................................................
1 Direct Radiation..............................................
1 AirSampling..................................................
1 O c e a n Wa t e r...................................................
1 Drinking Water................................................
1 Shoreline Sediment (Beach Sand)...............................
2 Ocean Bottom Sediment.........................................
2 Nonmigratory Marine Animals...................................
2 Local Crops...................................................
3 Soil Sampling.................................................
3 Jack Rabbit...................................................
3 Kelp.........................................................
3 Conclusions...................................................
3 Correlation of Environmental Concentration with E f fl u e n t R e l e a s e...................................................
4 Conclusions...................................................
5 i
I LIST OF FIGURES 1
Page Co-58 Li qui d Ef fl uent Rel ea se...................................... 6 Co-58 i n Ma ri ne Bi ota (SO NGS 1 )....................................
7 Co-58 i n Ma ri ne Bi ota (SONGS 2 and 3 ).............................. 8 Co-60 Li qui d Ef flu ent Rel ea se......................................
9 Co-60 i n Ma ri n e Bi ota (SONGS 1)....................................
10 Co-60 i n Ma ri ne Bi ota (SONGS 2 and 3)..............................
11 Cs -137 Li qui d Ef fl uent Rel ea se.....................................
12 C s-137 i n Ma ri ne Bi ota (SONGS 1 )...................................
13 Cs-137 i n Ma ri ne Bi ota (SONGS 2 and 3).............................
14 i
ii
J LIST OF TABLES c
Page Measurement Exceeding Twice Background Leve1.......................
15 Drinking Water.....................................................
15 Air Filter.........................................................
16 Qu a rterly Comp osi te Ai r Fi l te rs....................................
17 Annual Soil Results................................................
18 Ocean Bottom Sediments.............................................
18 Ma r i n e B i o t a.......................................................
20 Foot Notes.........................................................
26 Appendix A.........................................................
A-1 Appendix B.........................................................
B-1 l
1 l
l iii 1
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1 ASSESSMENT OF RADIOLOGICAL IMPACT OF PLANT OPERATION ON THE ENVIRONMENT Direct Radiation Gamna exposure rates were determined quarterly and annually at 59 locations.
Dosimeter locations are placed at a number of onsite locations, as well as at
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inner and outer environmental locations.
Each packet contained four dosimeters for a total of 1180 analysis.
The data for 1981 exhibits no significant difference between the offsite inner and outer rings of locations, thus indicating no offsite effects from plant operations. The control station at Huntington Beach averaged 29.9 mR over four quarters while the Visitor Center and the South Southwest Boundary averaged 22.9 and 24.2 mR respectively.
Air Sampling Air is continuously sampled at five locations around the site by passing approximately 12,000 cubic feet per week through a particulate filter and charcoal cartridge. The filter and cartridge are collected weekly and counted for gross beta and iodine 131 respectively. Weekly filters are composited quarterly for gross alpha, gamma spectral and strontium analysis.
No severe increases in gross beta activity occurred as seen in 1977 and 1978 following atmospheric nuclear tests although there was significant fluctuation in the activity. Measured gross beta activity between the inner and outer locations showed no major differences, thus indicating no contribution from the station. No levels of iodine -131 activity were noted in 1981 at either control or indicator stations. Gamma spectral analysis showed the presence of cosmic produced Be-7.
Cs-137 on air filter composite samples was not detected at any location except for a slight indication for the second quarterly
~
Measurable levels of composite at the NE Boundary and Units 2&3 Switchyard. 3 gross alpha activity ranged from 0.0009 to 0.0092 pCi/m and there was no significant difference between the inner and outer locations.
In conclusion, there were no significant differences between inner and outer stations for gross beta and gross alpha activity. Also, no iodine or strontium was detected in any sample.
Thus, there was no indication of any plant effects.
Ocean Water Ocern water is collected monthly at three station locations directly over the g
Unit.,2&3 outfalls and at one control.
Gross beta analysis is performed on y
the bimonthly samples and tritium analysis was performed on a semiannual composite. All samples analyzed showed no detectable levels of cesium or t ri ti um.
No plant effects were detected.
O V
2 Drinking Water Monthly drinking water was sampled at a local reservoir, a local well and at a control station.
Gross alpha and beta analysis was performed on both the solids and filtrate.
Samples were craposited quarterly and the composite solids and filtrate were again analyzed for gross alpha and beta activity.
The composite filtrate was also analyzed for tritium.
The action levels for strontium and gamma spectral analysis were not reached on any sample.
In general, the control station was consistently 10 to 20 percent lower than both local stations.
This difference is attributable to the variations in the natural levels of potassium-40.
In 1982, gamma spectral analysis will be performed on a monthly drinking water samples to support this assessment.
Shoreline Sediment (Beach Sand)
Beach sand was collected semiannually at four locations and gamma spectral analysis was performed.
The analysis showed the presence of naturally occuring radionuclides in the radium-226 and thorium-232 decay chains.
No man made radionuclides were observed with the exception of Cs-137 just south of Unit 1.
The activity was very low, 0.02 pCi/g, and was just twice the lower limit of detection.
This activity may have been related to the contaminated beach sand incident in 1981.
Ocean Bottom Sedinent Ocean bottom sediment was collected semiannually at four indicator and one control station.
Gamma spectral analysis was performed on all samples.
The presence of small quantities of cobalt-60, cesium-137 and manganese-54 were detected. The highest measured value was less than 1.3 pCi/g dry weight which is 100,000 times less than the reporting level.
Thus, the station impact is considered minimal.
Nonmigratory Marine Animals Two audit fish species, one crustacean and one mollusk were collected quarterly around Unit 1 and Unit 2 outfalls and at a control location.
Gamma spectral, radiochemical, strontium, and bound tritium analysis were performed on each sample.
Flesh and bone portions were analyzed separately.
Bound tritium analysis showed wide fluctuation.
Positive readings may be attributed to bioluminescence resulting from sample preparation (see twice background tables).
In 1982, both bound and aqueous analysis will be performed to support this assessment.
Small quantities of man made radio-nuclides were found more frequently at indicator stations than at the control, indicating plant related activity. Bottom dwellers such as sea hare showed much higher levels than fish.
The highest measured level in sea hare was 1.8 pCi/g wet weight of cobalt-60 and 0.010 pCi/g cesium-137 in fish.
These levels are 100,000 to 10 million times lower than reporting levels.
Thus the station impact is considered mininal.
3 Local Crops Local crops were collected semiannually at harvest time and analyzed by gamma spectral, tritium and strontium analysis. All measurements were below the minimum detectable levels except for very small levels reported at a control station. This activity can be attributed to fallout and is not a result of plant operations.
Soil Sampling Soil is sampled at five locations annually. Gamma spectral and strontium analysis were performed on all samples. The analysis showed small levels of cesium-137 in 3 of 5 samples and strontium 90 in 1 of 5 samples. The highest value was 0.15 pCi/g cesium. The levels at the inner station were not significantly different from the outer station indicating no plant effect.
Jack Rabbit Three rabbits uere collected north and northeast of the site during the year and analyzed. Gamma spectral analysis was performed on the flesh portior, radiciodine analysis was performed on the thyroid and strontium 89 and 90 analyses were performed on the femur. Usual levels of strontium in bone were observed which is attributed to fallout.
No iodine or cesium was detected on any sample, thus indicating no plant effect.
Kelp Kelp samples were collected semiannually at three indicators and one control station.
Gamma spectral, radiochemical verification and tritium analysis were performed.
No significant differences were noted between indicator stations and the control, thus indicating no plant effect.
Conclusions The varibility of the levels of radioactivity in environmental media depends on many factors. These factors include site release rates, meteorology, number and size of nuclear weapons tests, seasonal variability of fallout, soil conditions, local terrain, and variability in the natural background.
All these factors need to be considered in order to explain the levels of radioactivity in the environment.
Environmental data collected throughout the year 1981 have been carefully examined. The assessment of the potential exposure to the population from all plant related activity shows that in all cases the potential exposure is insignificant.
A i
CORRELATION OF ENVIRONMENTAL CONCENTRATION WITH EFFLUENT RELEASE Cobalt-58 -- A comparison between the effluent data for Co-58 and its level in marine species indicates no direct correlation between the effluent (Figure 1) and the activity level in marine biota.
Species such as Sea Hare caught near SONGS 1 outfall (Figure 2) showed higher-than-twice background level in their flesh.
This was most noticeable in the first quarter (March) where a value of 2.1 nCi/kg dry was obtained while the total quarterly activity of the effluent released was lowest (30 mci).
In June, the species Co-58 activity (1.0 nCi/kg dry) dropped by a factor of 2 and in the months of September and December, the Co-58 activities were 0.47 and 0.42 respectively; whereas, the effluent Co-58 activity released was highest in June, August, and September (45.6 mci in June, 47.4 mci in August, and 47.9 mci in September).
Bay Mussel and Sheep Crab caught at the SONGS 11 and III outfall area had greater-than-twice background in the month of June (Figure 3).
Cobalt-60 -- A comparison between the effluent Co-60 activity released (Figure 4) and the Cobalt-60 level in marine biota was made.
Sea Hare caught in SONGS I outfall had higher-than-twice background level in the flesh (29.0 nCi/kg dry) in March and 17.5 nCi/kg dry in June) (Figure 5). The highest effluent 00-60 activity was observed in June (1110 mC1).
The other species from SONGS I outfall area showed higher-than-twice background level. Spiny Lobster, Black Perch and Sheepshead exceeded the twice background level. The species caught near SONGS 11 and III outfall also showed levels higher-than-twice background level (Figure 6).
Spiny Lobster, Bay Mussel and Sheep Crab exceeded the twice-background level. Bay Mussell
5 had the highest Co-60 activity in June (2.2 nCi/ kg dry) when the effluent Co-60 activity reached its maximum.
C Cesium-137 -- The comparison between the Cs-137 activity in the effluent (Figure 7) and Cs-137 in the marine species (Figures 8 and 9) indicated that none of the species contained higher than twice background value of Cs-137 in their tissue. For example, Black Perch Cs-137 level was 0.021 averaged over four quarters and 0.032 for Sheepshead relative to the background level of 0.025 for Black Perch and 0.020 for Sheepshead. The Cs-137 activity of the efflucot peaked in March (89.3 mC1) and in June (189.0 mci), whereas the marine speries of SONGS I and SONGS II and III indicated a low and steady level of Cs-137.
CONCLUSIONS Even though the higher-than-twice background activity levels of radionuclides such as Co-58, Co-60 and Cs-137 may be attributable to the ef fluent release of these radionuclides to the ocean and deposition to the bottom sediments, no direct correlation has been observed, to date, between the high effluent values of these radionuclides and the marine species.
It should be menticned that the Co-58, Co-60 and Cs-137 activities were much lower than the technical specifications limit requirements and were as follows:
Percent of Technical Specification Limit for Particulates 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter
< 1.60 x 10-2%
< 6.58 x 10-2%
< 5.06 x 10-2%
< 3.28 x 10-2; Estimated total error 16%
6 Figure 1 i
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HEASUREMENTS EXCEEDING TWICE BACKGROUND LEVEL Analysis Date of Indicator (a) CommentsControl (Huntington B Medium Performed Locations Collection Drinking Water (pCi/1) i
- Filtrate Gross Beta Tri-Cities Reservoir March 17 7.9 Filtrate Gross Beta Tri-Cities Reservoir July-16 7.9 Solids Gross Beta Tri-Cities Reservoir May 2.2 1.0 4
For Comparison
- l Filtrate Gross Beta Tri-Cities Reservoir Jan. - Dec.
12.3(c) 7.9 1
l Solids Gross Beta Tri-Cities Reservoir Jan. - Dec.
1.0(c) 1.0
] Filtrate Gross Beta San Clemente Well No. 6 Jan. - Dec.
11.3(c)
- 7. 9 1; Solids Gross Beta San Clemente Well No. 6 Ja n. - Dec.
0.8(c) 1.0 i
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- Although single measurements may exceed twice background, a comparison to yearly averages indicates less than twice background.
i
e Analysis Date of Indicator (d) Comments
- Control (Huntingto Medium Performed Locations Collection 3
Air Filter (pCi/m )
Gross Beta Units 2&3 2/23/81 0.51 0.150 Gross Beta Vistor Center 4/13/81 0.55 0.163 Gross Beta Units 2&3 Switchyard 4/13/81 0.56 0.163 Gross Beta Units 2&3 Switchyard 4/20/81 0.33 0.163 Gross Beta Visitor Center 5/12/81 0.39 0.163 Gross Beta Visitor Center 5/18/81 0.33 0.163 Gross Beta Units 2&3 Switchyard 5/11/81 0.33 0.163 Gross Beta Units 2&3 Switchyard 5/18/81 0.36 0.163 Gross Beta Visitor. Center 12/14/81 0.088 0.036 Gross Beta Visitor Center 12/21/81 0.073 0.036-
- See Appendix A 5
e f
Analysis Date of Comments Medium Performed Locations Collection Indicator - Control (Huntington Beach) 7Be Visitor Center 1/5/81 - 3/30/81 0.16 0.06 Quarterly Composite 3
Air Filters (pCi/m )
7e Units 2&3 Switchyard 1/5/82 - 3/30/81 0.16 0.06 B
7Be Visitor Center 7/6/81 - 9/28/81 0.17 0.078 7Be Units 2&3 Switchyard 7/6/81 - 9/28/81 0.23 0.078 l
141Ce Units 283 Switchyard 4/5/81 - 6/29/81 0.05 0.008 141Ce Visitor Center 1/5/81 - 3/30/81 0.037 0.018 141Ce Units 283 Switchyard 1/5/81 - 3/30/81 0.041 0.018 144Ce Visitor Center 1/5/81 - 3/30/81 0.03 0.014 60C0 Visitor Center 7/6/81 - 3/30/81 0.008 N/A(f) 60Co Units 283 Switchyard 7/6/81 - 3/30/81 0.006 N/A 95 r 95Nb Units 283 Switchyard 7/6/81 - 3/30/81 0.012(g)
N/A Z
3
t Analysis Date of Comments Madium Performed Locations Collection Indicator Control (Huntington Beach)
Quarterly Composite 137 s Units 283 Switchyard 4/5/81 - 6/29/81 0.0021 0.001 C
Air Filters (pCi/m3)
Annual Soil Results 90 r Old Highway 101 12/31/81 0.05 0.01 S
(nCi/kg dry) 137 s Camp San Onofre 12/31/81 0.15 0.01 C
137 s Old Highway 101 12/31/81 0.13 0.01 C
137 s Visitor Center 12/31/81 0.05 0.01 C
Control-(North) 54Mn SONGS 1 - Upcoast 6/10/81 0.05 N/A Ocean Bottom Sediments (nCi/kg dry) 54 n SONGS 1 - Downcoast 6/10/81 0.11 N/A M
54 n SONGS I - Upcoast 12/11/81 0.03 N/A M
58 o SONGS 1 - Upcoast 6/10/81 0.06 0.01 C
58Co SONGS I - Downcoast 6/10/81 0.04 0.01 137 s SONGS I - Upcoast 6/10/81 0.05 0.008 C
137Cs SONGS I - Downcoast 6/10/81 0.05 0.008 137 s SONGS II - Upcoast 6/9/81 0.04 0.008 C
137 s SONGS I - Upcoast 12/11/81 0.07 0.008 C
137 s SONGS I - Downcoast 12/11/81 0.05 0.01 C
iis
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Analysis Date of Comments Medium Performed Locations Collection Indicator Control (North)
Ocean Bottom Sediments 60Co SONGS I - Upcoast 6/10/81 1.11 0.01 (nCi/kg dry) 60Co SONGS I - Downcoast 6/10/81 1.23 0.01 60Co SONGS II - Upcoast 6/9/81 0.08 0.01 i
60Co SONGS III - Downcoast 6/9/81 0.05 0.01 60Co SONGS 1 - Upcoast 12/11/81 1.30 0.02 60 o SONGS 1 - Downcoast 12/11/81 0.128 0.02 C
60Co SONGS II/III - Upcoast 12/11/81 0.045 0.02 60 o SONGS II/III - Downcoast 12/11/81 0.026 0.02 C
226Ra SONGS I - Upcoast 6/10/81 0.54 0.18 226Ra SONGS I - Downcoast 6/10/81 0.52 0.18 226Ra SONGS 11 - Upcoast 6/10/81 0.69 0.18 226Ra SONGS I - Upcoast 12/11/81 0.60 0.11 226Ra SONGS I - Downcoast 12/11/81 0.69 0.11 226Ra SONGS II/III - Upcoast 12/11/81 0.43 0.11 226Ra SONGS II/III - Downcoast 12/11/81 0.54 0.11 232Th SONGS I - Upcoast 6/10/81 0.56 0.18 232Th SONGS I - Downcoast 6/10/81 0.52 0.18 232Th SONGS II - Upcoast 6/10/81 0.69 0.18 232Th SONGS I - Upcoast 12/11/81 0.62 0.14 5
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Analysis Date of Conenents Medi um_
Performed Locations Collection Indicator Control (North)
Ocean Bottom Sediments 232Th SONGS I - Downcoast 12/11/81 0.80 0.14 232Th SONGS II/III - Upcoast 12/11/81 0.43 0.14 i
232Th SONGS II/Ill - Downcoast 12/11/81 0.53 0.14 Control (Newport Beach)
Marine Biota 58C0 SONGS I (Spiny Lobster) 3/18/81 0.05 0.02 (nCi/kg dry) 58 o SONGS I (Sea Hare) 3/20/81 2.1 N/A C
58C0 SONGS II/Ill (Bay Mussel) 3/12/81 0.05 N/A 58 o SONGS I (Shell Portion, 6/10/81 0.04 0.01 C
Spiny Lobster) 58Co SONGS I (Sea Hare) 6/4/81
- 1. 0 0.03 58Co SONGS II/III (Sheep Crab) 6/9/81, 6/10/81 0.16 N/A 58Co SONGS II/III (Shell 6/9/81, 6/10/81 0.03 N/A Portion) 4 58C0 SONGS II/III (Bay Mussel) 6/10/81 0.14 N/A 58Co SONGS II/III (Bone 6/10/81 0.02 N/A Portion) 1 58Co SONGS I (Spiny Lobster) 9/17/81 0.07 0.03 58Co SONGS I (Sea Hare) 9/24/81 0.47 0.03 t
58C0 SONGS II/III (Bay Mussel) 9/17/81 0.07 N/A 1
rt m.
t Analysis Date of Comments Medium Performed Locations Collection Indicator Control (Newport Beach) 58Co SONGS I (Sea Hare) 12/11/81, 12/13/81 0.42 0.02 Marine Biota (nCi/kg dry) 54 n SONGS I (Spiny Lobster) 3/18/81 0.025 N/A M
54Mn SONGS I (Shell Portion) 3/18/81 0.10 N/A 54Mn SONGS I (Sea Hare) 3/20/81 0.11 N/A 54Mn SONGS 11/111 (Bay Mussel) 3/12/81 0.05 N/A 54 n SONGS I (Black Perch) 6/9, 10, 11/81 0.02 N/A M
54Mn SONGS I (Spiny Lobster 6/10/81 0.07 N/A Shell Portion) 54Mn SONGS II/III (Sheep Crab) 6/9/81, 6/10/81 0.'67 N/A s
54Mn SONGS 11/111 (Shell 6/9/81, 6/10/81 0.11 N/A Portion) 54jk ~
SUNGS 11/1I1 (Bay Mussel) 6/10/81-0.14 N/A s
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54Mn SONGS 11/111 (Say Mussel) 9/J7/81 0.02 N/A i.
60Co SONGS I (Black Perch) 3/18/81 0.09
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g v Medium Performed Locations
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60Co SONGS II/III (Shell 9/17/81 0.10 0.'05 Portion)
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Marine Biota 110 nag SONGS II/III (Spiny 3/13/81 0.19 0.03 (nCi/kg dry)
Lobster) 110 mag SONGS I (Spiny Lobster) 6/10/81 0.63 0.02 110 nag SONGS I (Shell Portion) 6/10/81 0.33 0.10 110 nag SONGS I (Sea Hare) 6/4/81 0.9 0.04 110 mag SONGS II/III (Sheep Crab) 6/9/81, 6/10/81 0.24 N/A 110 nag SONGS II/III (Shell 6/9/81, 6/10/81 0.03 N/A Portion) 110 nag SONGS I (Spiny Lobster) 9/17/81 0.62 0.02 110 nag SONGS I (Shell Portion) 9/17/81 0.25 0.04 110 nag SONGS 1 (Sea Hare) 9/24/81 1.04 0.03 llanAg SONGS II/III (Spiny 9/17/81-0.59 0.02 Lobster) 110 nag SONGS II/III (Shell 9/17/81 0.18 0.04 Portion) 110 nag SONGS I (Spiny Lobster) 12/4, 11, 15/81 0.59 0.01 110 nag SONGS I (Shell Portion) 12/4, 11, 15/81 0.24 0.02 110 nag SONGS I (Sea Hare) 12/11/81, 12/13/81 0.22 0.01
t Analysis Date of Comments Medium Performed Locations Collection Indicator Control (Newport Beach)
Marine Biota 110 mag SONGS II/III (Spiny 12/11/81, 12/15/81 0.35 0.01 (nCi/kg dry)
Lobster) 110 nag SONGS. /III (Shell 12/11/81, 12/15/81 0.12 0.02 Portion) 3g(h)
SONGS I (Black Perch) 3/18/81 139 + 10 0 + 10 3H SONGS I (Spiny Lobster) 3/18/81 25 + 10 9+4 3H SONGS II/III (Sheepshead) 3/12/81 56 + 6 15 + 8 3H SONGS II/III (Black Percn) 3/12/81, 3/13, 81 70 + 10 0 + 10 3H SONGS I (Black Perch) 6/9, 10, 11/81 20 + 10 0+8 3H SONGS I (Sea Hare) 6/4/81 80 + 10 0+6 3H SONGS II (Sheepshead) 6/10/81 190 + 10 0+5 3
SONGS II (Black Perch) 6/10/81 100 + 10 0+8 H
3H SONGS II (Sheep Crab) 6/9/81, 6/10/81 160 + 10 N/A 3H SONGS II/III (Spiny 9/17/81 15 + 8 0+7 Lobster) 65 n SONGS 1 (Giant Keyhole) 3/20/81
- 1. 6 N/A Z
65Zn SONGS II/III (Bay Mussel) 6/10/J1 0.11 N/A 95Zr 95Nb SONS II/III (Bay Mussel) 3/12/81 0.10 N/A 90 r SONGS I (Spiny Lobster, 12/4, 11, 15/81 0.06 0.04 Shell Portion) g
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(a) Single neasurement (b) Yearly average (c) Yea..y average (d)
Single measurement (e) The contro! values are quarterly averages of measurements within the corresponding time pericd.
(f) Analyses were done for all radioisotopes in the table. Those below LLD were not reported under this reporting procedure and their values are assumed to be zero.
In future, all the LLD values will be reported.
(g) Comparison with the average value of 0.056 (0.076 on 1/5/81 and 0.036 on 6/22/81) does not indicate any release pattern.
(h) The values for bound tritium have not been distinguished from those attributable to bioluminescence. Standard deviation included to indicate relative error.
(1 ) Comparison of the quarterly averages indicate no plant-related release.
i APPENDIX A COMPARISON OF INDICATOR AND CONTROL QUARTERLY AVERAGES L
Analysis Date of Comments Medium Performed Locations Collection Indicator Control (Huntington Beach)(i)
Air Filters (pCi/m )
Gross Beta San Clemente 1/5/81 - 3/30/81 0.120 0.150 3
Gross Beta Camp Pendleton 1/5/81 - 3/30/81 0.122 0.150 1
Gross Beta Visitor Center 1/5/81 - 3/30/81 0.217 0.150 Gross Beta Units 283 Switchyard 1/5/81 - 3/30/81 0.200 0.150 Gross Beta San Clemente 4/6/81 - 6/29/81 0.083 0.163 Gross Beta Camp Pendleton 4/6/81 - 6/30/81 0.314 0.163 Gross Beta Visitor Center 4/6/81 - 6/29/81 0.232 0.163 Gross Beta Units 283 Switchyard 4/6/81 - 6/29/81 0.238 0.163 Gross Beta San Clemente 10/5/81 - 12/29/81 0.028 0.036 Gross Beta Camp Pendleton 10/5/81 - 12/29/81 0.023 0.036 Gross Beta Visitor Center 10/5/81 - 12/29/81 0.044 0.036 1
Gross Beta Units 283 Switchyard 10/5/81 - 12/29/81 0.037 0.036 4
B1 APPENDIX B Comparison of Operational Data with Preoperational A study of the San Onofre Nuclear Generating Station (SONGS) Unit I was conducted from 1964-1967 in order to provide the preoperational data for San Clemente and Oceanside (control). The gross beta activity in air particulates was measured for all the sites on a weekly basis. Figure 1 indicates the monthly variation in the gross beta activity of the air particulates.
As is seen, the two sites show no significant difference in the beta activity. The more-than-normal beta activity and the presence of macy peaks are indicative of atmospheric nuclear weapon testing within the corresponding time period.
Tne increase in beta activity in the early months of 1967 (peak in January) is thought to be the results of Chinese nuclear tests of December 1966. The decrease in activity levels from 1965 to 1967 might be ascribed to the curtailment of nuclear testing in the atmosphere since 1962. Figure 1 also indicates that the control site beta activity is almost as high as the indicator site.
Therefore, it can be concluded that the rise in beta activity is not the result of plant construction and is the result of atmospheric weapon testing.
It should be mentioned that the presence of such weapon tests make the comparison difficult since the background level is affected.
Figure 2 compares the San Clemente preoperational data obtained between the period of November 1966 to June 1967 with San Clemente operational data (Figure 3) obtained between the period of January 1978 to December 1981.
These data suggest that there is not plant-related activity released to the environment.
O B2 Operational data for three locations, San Clemente, Visitor Center, and Huntington Beach (control) have been presented in Figure 4.
The rise in April 1978 in gross beta activity in all the sites may be attributed to the nuclear weapon testing of March 1978. These peaks are 0.185 for San Clemente, 0.230 for Visitor Center, and 0.242 for Huntington Beach (control), respectively.
The larger group of peaks located between November 1980 and June of 1981 may be the results of the Mount Saint Helen volcanic erruption of May 1980. The dispersion of the volcanic plume has raised the environmental levels 3
throughout the country. The peaks in May 1981 (0.40 pCi/m ) for Huntington 3
Beach and in February (0.31 pCi/m ) for Visitor Center can be seen in Figure 4.
The other minor peaks are within the statistical deviation of data.
Result This assessment indicates that the variation of radioactivity level in environmental media will be affected by several sources. Meteorology, atmospheric nuclear weapon testing, fallout frequency, terrestrial conditions, coal processing plants, and the occurrence of earthquake and volcanic activities are among the factors whose presence may affect, and lead to the elevation of, the natural background levels in the environraent. All activity noted is either at or below activity attributible to these sources.
It is, therefore, concluded that the plant operation has not had any impact on the envi ronment.
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