ML20099F858
| ML20099F858 | |
| Person / Time | |
|---|---|
| Site: | 05000187 |
| Issue date: | 08/31/1984 |
| From: | Avant D, Cozens G, Woods J NORTHROP RESEARCH & TECHNICAL CENTER |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| R327-84-193, NUDOCS 8411270003 | |
| Download: ML20099F858 (12) | |
Text
s' 1.
NATURAL ENVIRONMENTAL RADIOACTIVITY SURVEY FOR THE PERIOD OF SEPTEMBER 1983 THROUGH AUGUST 1984 Prepared by:
Dan U. Avant, Jr.
George B. Cosens Joe E. Woods NORTHROP CORPORATION NORTHROP RESEARCH AND TECHNOLOGT CENTER One Research Park Palos Verdes Peninsula, California 90274 (213) 377-4811 l
l h
I )i h A O DR R
l I
e NORTHROP RESEARCH _ME TECHNOLOGY CENTER I
INTRODUCTION l
i The health physics environmental sampling program includes a conticuous 4
evaluation of the levels of naturally occurring radioactivity in the immediate environs, and out to a radius of five miles from the Northrop Reactor site.
Fluctuations in the radioactivity content of the environmental samples occur from time to time due to seasonal and clinatic conditions-which may effect the deposition of the atmospheric fallout or other airborne j
radioactive caterials. These 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.
l This, twenty-third annual report. is a compilation of the data derived i
from the environmental samples collected and processed during the period of September 1983 through August 1984.
In order to maintain continuity in the overall sampling program, the i
sampling sites have not been changed from those shown in Tablo 1.
All sample processing and handling techniques have rouained the same as those stated in the previous reports.
l. _ -. _
~,... -... _. _.. _ _ _ _ _ _, _. _. -,.
.~. _ _,. _ _ _ _, _ -
~
1 NORTHROP RESEARCH M TECHNOLOGY. CENTER M ANALYSIS l
A total of 74 continuous air samples were collected during the period from sites S-11 and S-12.
The sampling ti=e averaged 251 hours0.00291 days <br />0.0697 hours <br />4.150132e-4 weeks <br />9.55055e-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 aach 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 increase in activity is shown in comparison with the previous periods for the months of November and January through !!ay.
RAINWATER ANALYSIS A trotal of 28 samples were collected from sites S-11 and S-12.
The radioactivity content of the rainwater, as shown in Figure 2, shows a slight increase for September 1983 and liarch 1984-over the previous rcoort, and a significant decrease for the month of August 1984 over the previous report period.
SOIL ANALYSIS A total of 108 soil camples were collected from the sampling sites indicated in Table 1.
The radioactivity content of the soil samples, as shown in Figure 3, indicates an overall stable trend with reductions for the months of January and April 1983 periods over the previous report i
periods. _
NORTHROP RESEARCH 131 TECHNOLOGY CENTER YEGETATION ANALYSIS A total of 108 vegetation samples were collected and processed from the same areas as the soil samples.
The sample averages, as shown in Figure 4, were quite typical with both slight increases and decreases in l
radioactivity.
VATER ANALYSIS A total of 120 water samples were collected from the sites indicated in Table 1.
The co=bined monthly averages for drinking water and pond water are shown in Figure 5.
The water samples indicated a slight rise in radioactivity for the first 3 months of.the report and a corresponding decrease for the last six months of the report period.
DISCUSSION Analysis of the data for the overall environmental samplos indicates a reasonably stable trend in their radioactivity content, with several slight decreases in water sample activity during the last six months of report period over previous periods and a significant decrease in rain ar.mple activity for the conth of August over previous periods.
l 1,
1
4 t
l l
l
(
i NORTHROP RESEARCH M TECHNOLOGY CENTER i
1 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 i
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.
i was reasonably stable, it is apparent that the Northrop Reactor and associated facilities have not contributed significantly to the natural radioactivity background.
P d
'I f
i i
t i
J I
I I
4 l
5-i
3.
1 i
r t
t l
NORTHROP RESEARCH Allp_ TECHNOLOGY CENTER i
j TEM I
,i J
l SA!!PLING SITES l
I SITE LOCATION SAMPLES TAKEN 4
i 1
j S-1 I?eactor Soil, vo;ctation, and drinking unter i
S-2 Icperial Highuay and Soil, vo;etation, and drinkin; water i
Ingleucod 31vd.
4 j
S-3 Icporial Hi.;huay and Soil, vo;etation, and drinking unter j
Sepulveda 31vd.
1
{
S-4 Prairie Avenue and Soil, ve;etation, and pond uater 2cdondo 3each 31vd.
(Alondra Park) 1
}
S-3 Hautherno 31vd. and Soil, vo;otation, and drinkin; uater T.edondo 3each Divd.
l S-5 Hautherne Blvd. and Soil, vegetation, and drinkin; trator 190th Street
.i S-7 "ornandie and Soil, ve;etation, and drinkin3 uator El Se; undo 31vd.
i l
S-0 Rococranc and Contral Soil, ve;otation, and drin':in; unter d
Avonue l
l S-9 Hautherne 31vd. and Drinkin; uater Century
.a. venue t
l
.;-10 La 3rca Avenue and Goil, ve;ecation, and drinkin; unter l
Slaucon Avenuo 3-11 Atop 2ngineerin; Contor Air (oarticulatoc), and rainuator 900 ydc..: cat of P.eactor S-12 Atop Plant 3, 200 ydc.
Air (particulatoc), and rainuator j
cast of Reactor J
l 4
t 3-I I
- M"t+EW------w=-i-r-w er;wt*-
pg-g
,yye v v y'yy*ag,sq,ymr--g-
-gur gm-h-9-=-*e--g meyw-yw-+shr--
pgm,--r--vvh.wym-*--mg,7-W@t Nr WP*F*wt$"WN
-- M FE N P -'
l
,1 j
I Qxer umaxww xg
~H-Oo e
- U Ne -
9 1
1 2
2 5
0 5
0 5
mwc F
I G
U R
E ouH 1
1 98 3
=a>
- o 1n 1t h
al ny awu d
A Sv
- e 1r
, < =
2a g
e
_. 7 s
o uwcm f
C on t
zae inuo u
s
<cm A
ir 1
9 S
8 z <>-
a 4
m p
les
,m=
from S
,oa i
tes
<oe
'1)l;
RAItMATER ACTIVITY (10-9 pCi/ml) 7 Y
.M o
o o
o o
o o
o o
l l
l A
SEPT E
m
-g 0CT N
w 2
=
N0V E
w y
@2g JAN h
E y
FEB NO RAIN e*
(
APR 2
G MAY NO RAIN 2a JUN NO RAIN E
T JUL NO RAIN C
i R
AUG T
M 1
i
lfli i
mo
<arS U o'm 23 Nme i ot aE', aO c
2 1
0 0
0 F
I G
mwcs UR E
3 oar 1
Sl 9
i
- o 8
1n 3
0t
=o>
h ly Av cwv era ges
,<=
o f
. ~
S
~
o wwcc i
l Sam r<e p
le s
<oe f
r o
1 m
98 S
4 x<>-
i tes S
,m=
1 t
h ru
,ma S
-8 a
<ae n
d l;
l l11 l
li;
.e
>wawi p oz *oC > t>-
- z. G s E
- oD <mc-f 0
1 5
0
~
F mwcr I
G U
R E
ooh 4
1 98 a M 3
n o za>
d n t
S h l
1 y 0
owu Avera g
o<=
es o
f 1
wwm 0
V e
g e
t a
x<x t
ion S
<oa a
m 1
p 9
l 8
e 4
s zy>.
f rom S
,2z i
te s
S
,ma 1
t hr
<3e u
S
,8 l)1
4-3-
e s
W T
O C
2-C r
U=c em W
<2 1-1 s
S U
E S
E
~
=
m z
a e
E E
g g
g m
o
=
o m
1983 1984 FIGURE 5 Monthly Averages of Water Samples from Sites S-1 thru S-10 i
l l l.
In reply refer to: R327-84-193 9
NORTHROP November 8, 1984 Office of Ir.spection & Enforcement c/o Distribution Services Branch DDC-ACM Washington, D. C.
20055 Attention: Director
Enclosure:
Natural Environmental Radioactivity Survey for the period of September 1983 through August 1984 Gentlemen:
Enclosed are seventeen copies of enclosure (1), the Natural Environmental Radioactivity Survey for the period of September 1983 through August 1984, 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 Technology Center One Research Park Palos Verdes Peninsula, California 90274 Sincerely, LL J. Benveniste, Chairman Corporate Radiation Committee JB:rb Encls.
i i
- ...,, c.....,
w Cre 59~. ;b PM. Pou V.r m Pr w t CLRu n.a 207 74 Te - ;
t 21:N J / '.J J:11
=
.