ML20083G052
| ML20083G052 | |
| Person / Time | |
|---|---|
| Site: | 05000187 |
| Issue date: | 08/31/1983 |
| From: | Avant D, Cozens G, Woods J NORTHROP RESEARCH & TECHNICAL CENTER |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| R327-83-179, NUDOCS 8401060008 | |
| Download: ML20083G052 (12) | |
Text
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NATURAL ENVIRONMENTAL RADI0 ACTIVITY SURVEY FOR THE PERIOD OF i
SEPTEMBER 1982 THROUGH AUGUST 1983 Prepared by:
Dan Avant George Cozens Joe Woods NORTHROP CORPORATION NORTHROP RESEARCH AND TECHNOLOGY CENTER One Research Park Palos Verdes Peninsula, California 90274 (213) 377-4811 8401060008 830831 DR ADOCK 05000187 PDR
f s.- .=u NORTHROP RESEARCH AND TECHNOLOGY CENTER ,
INTRODUCTION The health physics environmental sampling program includes a continuous evaluation of the levels of naturally occurring radioactivity in the immedi-ate environs, and out to .a radius of five miles from the Northrop Reactor site.
Fluctuations in the radioactivity content cf the environmental samples occur from time to time due to seasonal and climatic conditions which may effect the deposition of the atmospheric fallout or other airborna radioactive materials. These minor variations must be noted since they do add to the nat-ural environmental background; therefore, it is quite important to compile the sample data and periodically compare it with the data from the previous sampl-ing periods in order to establish the trend.in the natural background.
This, twenty-second annual report, is a compilation of the data derived from the environmental samples collected and processed during the period of September 1982 through August 1983. -
In order to maintain continuity in the overall sampling program, the sampling sites have not been changed from those shown in Table I. All sample _
processing and handling techniques have remained the same as those stated in the previous reports.
AIR ANALYSES A total of 88 continuous air samples were collected during the period from sites S-11 and S-12. The sampling time averaged 206 hours0.00238 days <br />0.0572 hours <br />3.406085e-4 weeks <br />7.8383e-5 months <br /> per sample.
A 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> decay period was permitted on each sample prior to counting to ..
eliminate natural Radon-Thoron activities.
Figure 1, graphically displays the monthly averages from the two sampling stations. A slight overall decrease in activity is shown in comparison with the previous periods.
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NORTHROP RESEARCH AND TECHNOLOGY CENTER RAINWATER ANALYSES A total of 36 samples were collected from sites S-11 and S-12. The radioactivity content of the rainwater, as shown in Figure 2, shows an increase in radioactivity for August over the previous periods. Sample S-12 contained an excess of particulates possibly due to construction work in the area.
S0IL ANALYSES A total of 108 soil samples were collected from the sampling sites indica-ted in Table I. The radioactivity content of the soil samples, as shown in Figure 3, indicates a relatively stable trend.
VEGETATION ANALYSES A total of 108 vegetation samples were collected and processed from the same areas as the soil samples. The samples indicated no significant increase in radioactivity content. The overall trend was quite typical. The monthly averages are shown in Figure 4.
WATER ANALYSES A total of 120 water samples were collected from the sites indicated in Table I. The combined monthly averages for dri" king water and pond water are shown in Figure 5. The water samples indicated a slight rise in radioactivity for the last six months of the report period.
DISCUSSICN Analysis of the data for the overall environmental samples indicates a reasonab!y ; table trend in their radioactivity content, with several slight increases in watcr sample activity during the last six months of report period over previous periods and a significant increase in rain sample activity for the month of August over previous periods.
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NORTHROP RESEARCH AND TECHNOLOGY CENTER At times the radioactivity content of the environmental samples changed due to climatic conditions, the prevailing winds (with the change in seasons),
and the temperature inversions in the Los Angeles basin. The smog content in the air during periods of temperature inversions tends to increase the natural background radioactivity of the air.
Since the overall radioactivity content of the environmental samples was reasonably stable, it is apparent that the Northrop Reactor and associated facilities have not contributed significantly to the natural radioactivity background.
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NORTHROP RESEARCH AND TECHNOLOGY CENTER TABLE I SAMPLING SITES SITE LOCATION SAMPLES TAKEN 5- 1 Reactor Soil, vegetation, and drinking water S-2 Imperial Highway and Soil, vegetation, and drinking water Inglewood Blvd.
S-3 Imperial Highway and Soil, vegetation, and drinking water Sepulveda Blvd.
S-4 Prairie Avenue and Soil, vegetation, and pond water Redondo Beach Blvd. ( Alondra Park)
S-5 Hawthorne Blvd. and Soil, vegetation, and drinking water Redondo Beach Blvd.
S-6 Hawthorne Blvd. and Soil, vegetation, and drinking water 190th Street S-7 Normandie and Soil, vegetation, and drinking water El Segundo Blvd.
S-8 Rosecrans and Central Soil, vegetation, and drinking water Avenue S-9 Hawthorne Blvd. and Drinking water Century Avenue S-10 La Brea Avenue and Soil, vegetation, and drinking water Slauson Avenue S-11 Atop Engineering Center Air (particulates), and rainwater 900 yards west of Reactor S-12 Atop Plant III, 200 yards Air (particulates), anc rainwater east of Reactor 4
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In reply refer to: R327-83-179 q b~ Ll 1 NORTHROP December 1,1983 Office of Inspection & Enforcement c/o Distribution Services Branch DDC- ACM Washington, D.C. 20055 Attention: Director
Enclosure:
(1) Natural Environmental Radioactivity Survey for the period of September 1982 through August 1983 Gentlemen:
Enclosed are seventeen copies of enclosure (1), the Natural Environmental Radioactivity Survey for the period of September 1982 through August 1983, as required by our Reactor License R-90.
All correspondence related to the above enclosure should be directed to the undersigned at the following addrc:::::
Northrop Corporation ZQF Northrop Research and Technology Center One Research Park Palos Verdes Peninsula, California 90274 Sincerely.
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/ .~+ w A L k.Benveniste, Chairman Corporate Radiation Committee JB:jm
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Northrop Corporation e Northrop Research and Technology Center One Researcts Park, Palos Verdes Perunsuu, Catornia 00274
- Telechone I213) 37 7-4811
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