ML20203B833
| ML20203B833 | |
| Person / Time | |
|---|---|
| Site: | 05000187 |
| Issue date: | 08/31/1985 |
| From: | Benveniste J, Cozens G, Woods J NORTHROP CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| R327-85-82, NUDOCS 8604180264 | |
| Download: ML20203B833 (14) | |
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t l NATURAL ENVIR0!GGDffAL RADI0 ACTIVITY SURVEY 1
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FOR THE PERIOD OF
'.. SEPTEME 1984 THROUGH AUGUST 1985 i
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George B. Cosens Joe E. Woods i NORTHROP CORPORATION NORTHROP RESEARCH AND TBCHNOLOGY CENTER O
One Research Park Palos Verdes Peninsula, California 90274 (213) 377-4811 o -
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INTRODUCTION
- The health physics environmental sampling program includes a continuous 3
r evaluation of the levels of naturally occurring radioactivity in the C
R immediate environs, and out to a radius of five miles from the Northrop' l Reactor site.
? Fluctuations in the radioactivity content of the environmental samples fC ,
occur from time to time due to seasonal and climatic conditions which may aff ect the deposition of the atmospheric f allout or other airborne radioactive materials. The~se minor variations must be noted since they do add to the natural environmental background; therefore, it is quite important to compile the sample data and periodically compare it with the data from the previous sampling periods in order to establish the trend in the natural background.
This, twenty-f ourth, annual report, is a compilation of the data derived from the environmental samples collected and processed during the iC period of September 1984 through August 1985.
( In order ta --i-t .in continuity in the overall sampling program, the ,
i sampling sites have not been changed from those shown in Table 1. All lO sample processing and handling techniques have remained the same as those L
stated in the previous reports. -
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'O AIR ANALYSIS
- A total of 70 continuous air samples were collected during the period l- from sites S-11 and S-12. The sampling time averaged 250 hours0.00289 days <br />0.0694 hours <br />4.133598e-4 weeks <br />9.5125e-5 months <br /> per sample.
j 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
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sampling stations. In comparing with the previous report, there was a minor reduction in activity during the first three months of the report period, t
n followed by slight increases in the remaining nine months of the reporting period.
RAINTATER ANALYSIS A total of 20 samples were collected from sites.S-11 and S-12. There was no rainf all during the first month and last three months of the report period. Average rainfall activity was lower than for the previous reporting
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I SOIL ANALYSIS *
( A total of 108 soil samples were collected f' rom the sampling sites c
indicated in Table 1. The radioactivity content of the soil samples, as
.[ shown in Figure 3, indicates small incresses over the previous reporting
$ period.
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NORTHROP RESEARCH AND TECHNOLOCY C M TER iO .
VECETATION ANALYSIS A total of 108 vegetation samples were collected and processed from the same locations as the soil samples. The sample averages , shown in i.
Figure 4, run a little higher than those during the previous reporting period.
O WATER ANALYSIS A total of 120 water samples were obtained from the sites indicated in Table 1. The combined monthly averages for drinking water and pond water C
are shown in Figure 5. The water samples indicated an average activity level drop for the first two months of the report period, and a slight increase in the activity averages for the remaining 10 months of the C
reporting period.
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- O-DISCUSSION
- l Analysis of the environmental sampling data when compared to previous reporting periods indicates reasonably stable trends in the radioactivity
' C content. Although the latter part of the reporting period showed sons J
i slight increase over those of the last report, each of the monthly averages i
i fell within the ranges seen in the past few years. At times this content
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- t " changes due to climatic conditions, the prevailing winds (with the change a
in seasons), and the temperature inversions in the Los Angeles basin. The saos content in the air during these inversion periods tends to increase the natural background radioactivity of the air.
, __ Since the overall radioactivity content of the environmental samples was reasonabl.y stable, it is apparent that the Northrop Reactor and associated f acilities have not contributed significantly to the natural radioactivity background.
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\c TABLE 1 l
SAMPLING SITES SITE LOCATION SAMPLES TAKEN S-1 Reactor Soil, vegetation, and drinking water S-2 Imperial Highway and Soil, vegetation, and drinking water O Inglewood Blvd r
i S-3 Imperial Highway and Soil, vegetation, and drinking water i
Inglewood Blvd S-4 Prairie Avenue and Soil, vegetation, and pond water n 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
- c. 190th Street S-7 Normandie and Soil, vegetation, and drinking El Segundo Blvd S-8 Rosecrans and Central Soil, vegetation, and drinking water
't Avenue S-9 Hawthorne Blvd and Drinking water Century Avenue .
S-10 La Brea Avenue and Soil, vegetation, and drinking water O Slauson Avenue S-11 Atop Engineering Center Air (particulates), and rainwater 900 yds west of Reactor S-12 Atop Plant 3, 200 yds Air (particulates), and rainwater !
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east of Reactor
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, FIGURE 3 Monthly Averages of Soil Samples from Sites S-1 thru S-8, and l S-10 40 -
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i FIGURE 4 Monthly Averages of Vegetation Samples from Sites S-1 thru S-8, !
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FIGURE 5 Monthly Averages of Water Samples from Sites S-1 thru S-10
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November 26,1985
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U.S. Nuclear Regulatory Commission Region V Office of Inspection and Enforcement 1450 Maria Lane, Suite 210 Attention: Director
Subject:
Natural Environmental Radioactivity Survey for the period of September 1984 through August 1985 Gentlemen:
Enclosed are two copies of noted subject, the Natural Environmental Radioactivity Survey for the period of September 1984 through August 1985, as required by our Reactor License R-90.
All correspondence related to the above enclosure should be directed to the undersigned at the following address:
Northrop Corporation ZQF
, Northrop Research and Technoiogy Center One Research Park Palos Verdes Peninsula, California 90274 Sincerely,
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, ,h J. Benveniste, Chairman Corporate Radiation Committee f
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Northrop Corporation e Nortnroa Pes earen .imd Tecnac;c;v Cenn /
one Research Park, Pms Verdes Peninsula. Cal farn.a 00274
- To 0%ne 614 37 7-4811 G
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