View source for HL-4817, Forwards Assessment of Results of Augmented Radiological Environ Monitoring Program for Yrs 1992 Through 1994

{{Adams
| number = ML20087G389
| issue date = 03/28/1995
| title = Forwards Assessment of Results of Augmented Radiological Environ Monitoring Program for Yrs 1992 Through 1994
| author name = Beckham J
| author affiliation = GEORGIA POWER CO.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
| docket = 05000321, 05000366
| license number = 
| contact person = 
| document report number = HL-4817, NUDOCS 9504040194
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE
| page count = 15
}}

=Text=
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:     O Georgia Power Compan;f 1                    '
                          ,a       ' 00 inwirness Center Pardway ' ..                                                                                 ,
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                            .    .4 Birmingham. Alabama 35201                          ,
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        .,                              J. T. Beckham,' Jr.                                                              Georgia Pbwer-2 Vice President Nuclear                                                                        .
ftn souton doctnc system
                   .                . Hatch Project                                                                                                   s A rch 28, 1995
                                       ' Docket Nos. 50-321.                                                                  HL-4817                ;
50-366-
                                                                                                                                       ^
U. S. Nuclear Regulatory Commission                                                                          ;
ATTN: Document Control Desk :
Washington, D. C. 20555'                                                                                    ,
Edwin I. Hatch Nuclear Plant Assessmento' f Results of Augmented Radiological Environmental Monitoring Pronram for the Years 1992 Through 1994                                1 Gentlemen:
Georgia Power Company's (GPC's) letter to the NRC dated January 7,1987,'provided a description of an augmented Radiological Environmental Monitoring Program (REMP)
                                      . that was initiated on December 15,1986, following the release of radioactive water from                   j the spent fuel storage pools at Plant Hatch to an onsite swamp on December 3 and 4,                         ;
1986. By lettes dated March 31,1988; April 3,1989; and March 31,1992, GPC                                   '
provided the results of the augmented REMP and appropriate program modifications for-                       +
the periods of December 15,1986, through 1987; 1988; and 1989 through 1991, .
respectively.
Enclosed is an assessment of the program results for the years 1992 through 1994. The assessment indicates that radioactivity levels in the swamp continue to decrease.                           ,
Consequently, the assessment period is being extended to 5-years. The next status report -                 s, will be submitted by April 2000 at which time GPC plans to discontinue the augmented i                                        REMP.
Please contact this office should you have any questions.
1 i-Sincerely, l
040139 Q@bK3 (f. T. Beckham, Jr.
7 j
W H O/eb

==Enclosure:==
(See next page.)
[/-     g 9504040194 950328 PDR     ADOCK 05000321                                                                                 l R                       PDR                                                                            I

                                                                                                      ~
GeorgiaPower d U.S. Nuclear Regulatory Commission                                                  Page Two March 28,'1995

==Enclosure:==
Assessment of Results of Augmented Radiological Environmental Monitoring Program for the Years 1992 through 1994 cc: Georgia Power Company Mr. H. L. Sumner, Jr., Nuclear Plant General Manager NORMS U. S. Nuclear Rerulatorv Commission. Washington. D. C.
Mr. K. Jabbour, Licensing Project Manager - Hatch U. S. Nuclear Regulatorv Commission. Region 11 Mr. S. D. Ebneter, Regional Administrator Mr. B. L. Holbrook, Senior Resident Inspector - Hatch 1
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HL-4817

l L                                                                                                                            Enclosure
                                                                             -             A==*==maat of Results of Augmented Radiological
                                                                    '-                                          Environmental Monitoring Program for the Years 1992 Throuah 1994
                                                                    . On December 3 and 4,1986, an event occurred at the Hatch Nuclear Plant (HNP) in                                              4 which radioactive water from the Spent Fuel Storage Pools (SFSP) ) was released into the onsite swamp east of the cooling towers. As a result of this event, Georgia Power Company (GPC) initiated an augmented radiological environmental monitoring program concerning the swamp on December 15,1986. This program, as described in a letter to the NRC dated January 7,1987, calls for a periodic assessment of the program's results                                        1 l
and any appropriate modifications to the program (including termination) as a l
consequence of the assessment.
Past assessments of the results of this program were reponed to the NRC by letter as given below:
Psliad                                                        Date of Letter 12/15/86 through 1987                                         03/31/88
                                                                               ,     '1988                                                          04/03/89 1989-1991                                                     03/31/92 This report provides the assessment of the program's results for the years 1992 through 1994 with modifications thereto.
The program commitment for the years 1992 through 1994 calls for the annual collection -
of samples at Locations A, PL-2, PL-3, MBC and at a background location for gamma isotopic analysis. Collections were also made at Location B each year and at Location H in 1992 and 1994. In 1993, the collection for Location H was inadvertently taken about 15 yards south of the position intended. This unintended position is labeled Location '
New H. Collections were also made at Location New H in 1994. The activities of the manmade radionuclides found in each of the samples collected at these select locations during 1992-1994 are provided in Table 1. The average activities at these select locations for each year from 1987 through 1994 are presented in Table 2.
All of the sampling locations except for New H and the background location are shown in Figure I and/or Figure 2. The annual collections were made on September 14,1992, October 4,1993, and October 4, or November 30,1994. At least two samples were taken at each location on the collection dates. The samples were composed of substantial quantities of root and other organic material, mud, and sediment. All of the laboratory analyses were performed at GPC's Environmental Laboratory in Smyrna, Georgia.
HI 4817                                                        E-1

                        ' Enclosure .
Assessment of Results of Anonwav ~     e d Radialnoir.1 Environmental Monitoring Program for the Years 1992 Through 1994 e
In 1994, muck samples were also collected at all of the other monitoring locations in the
                       . swamp where collections have not been made since 1987. The only manmade -                               1 radionuclide found at these other locations (in 1994) was Cs-137; its activity in each of the       1 samples collected is provided in Table 3. In Table 4, the average activities at these other             j locations for 1987 are compared with those for 1994.-                                                 )
                                                                                                                             ~
Location A is situated in the swamp pond adjacent to the point where the water from the               I SFSP entered the swamp. Location B is positioned in an effluent stream from the pond; it               i
                       - is the only effluent stream from the pond when the water level in the river is low. Under              I high water conditions, Location H lies along a release pathway.
Locations PL-2 and PL-3 lie along the plant's eastern propeny line. Location MBC lies                 l along the right bank of Bay Creek adjacent to its entry into the Altamaha River. Bay                  l Creek provides a drain for the swamp; the mouth of Bay Creek is about three quarters of a             l mile east of the plant's eastern property line. Location PL-2 lies on the left bank of Bay            l Creek. The background location, like the swamp, lies in the floodplain of the Altamaha                ,
River but is positioned about 0.8 miles upstream of the plant's discharge and on the                  ;
opposite side of the river.                                                                           l
.                        From an examination of the results presented in the tables, the following observations are            j made.                                                                                                 ;
i As shown in Tables 1 and 2, Eu-154 was found in one of the samples collected in 1992 at -             !
the background location. This radionuclide is not released from the plant. An explanation             i for its presence at this location has not been determined.                                            !
As might be expected, the activities found in the samples collected at Location A continue            .
to dominate those collected elsewhere both in the number of radionuclides detected and in             l the levels of these radionuclides. In general, the levels diminish with distance from                 ;
Location A.                                                                                           i The variability in the activity levels found in the samples which were collected on the same         l dates at approximately the same locations (that is, within several feet of each other) as             j i
shown in Tables I and 3 suggests a lack of uniformity in surface contamination. It also reflects the difficulty in obtaining replicate samples, especially at locations where there is a preponderance of root matter in the soil. Effons were made in obtaining samples to an .
average depth of approximately one inch. The variability may also be attributed in part to            !
a failure in obtaining each sample to this depth.
l 1
HL-4817                                          E-2                                                    l 1
l 1

l
  ^
        ' Enclosure Assessment of Results of Augmented Radiological                                                 i Environmental Monitoring Program for the Years 1992 Through 1994 t
l Table 2 shows a generally steady reduction in the activity levels with time at the select locations as a consequence of decay and weathering. It should be noted that, due to the migration of the radioactive material through the swamp, activity levels deep in the swamp (locations PL-2, PL-3 and MBC) can be characterized as mixed or even slightly increasing. Table 4 echoes this general reduction throughout the swamp.
Only radionuclides with halflives greater than 2 years - namely, Co-60, Cs-134 and Cs-137 - were found in the samples collected during this three year period. Except at Location A, the levels found for Co-60 and Cs-134 (with radiological halflives of 5.3 and 2.1 years, respectively) were at most only a few times their nominal detection levels.
The swamp might be considered to have retumed to a pristine condition when the levels found in the samples are not significantly different from those found at the background location. On a practical bar,is, this mees that only Cs-i37 which has a radiological half life of 30.2 years would be found at a level of about 400 pCi/kg dry. Except at Location A, the Cs-137 levels generally found during 1994 were only a few times greater than that for the background location.
Since reductions in the activity levels are anticipated to continue at about the same relative rate, a longer period for reporting is warranted. Henceforth, the program is modified to        l extend the assessment period up to five years. As a minimum, muck samples will continue         :
to be collected annually at Locations A, PL-2, PL-3, MBC and at a background location for gamma isotopic analysis. By April 1,2000, GPC will provide a written report of the assessment of the program results for the Years 1995 through 1999. Barring significant          .
adverse changes in the results of that assessment, the augmented REMP will be terminated        i at that time.
t e
HL-4817                                       E-3

3         .
       'T' Tabie'1-Activity of Manmade Radionuclides found in Each Sample Collected At Select. Locations During 1992, 1993 and 1994
                                                                     --(pC1/kg dry)
Location                1992                      1993              1994 Sample No.       1       2:   3             1      2      3     1        2' F --
Ha.ckoround                                                                      .;
Cs-137           445     411                323-   346          426      478         :
Eu-154                    72                                                         l I
A Co-60           1660    2350' 1190          985    952    945   833      837 Cs-134           795     713    646         310    363    304   188      270 Cs 137        10400     9790  9100         4120   4230  3870   3810'   3900
{
g Co-60              41     29                         62 Cs-137           107     105                239-   191-         177      149     -i 11 Cs-137             46     42                                    520      527         :
EftLil        '
Co-60                                         72 Cs-134                                        74     66                               ;
Cs-137                                     1800   1730         1100    1360 i
EL_2 Cs-137           953     879                580    583          585      715-.         ,
i EL_3                                                                               'l Cs-137 288     287                132    123          136      131 MBf Co-60                     70                101      78         171       97
                                 .Cs-137           305     303                363    390          271      260 l
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                                             . Table 2 (Sheet ~1 of 2)-                       ~
                                                            -                                   J Average Activity of~ Manmade Radionuclides Found in Samples           i Collected at Select 1.ocations in Each of the'Following Years
                                                                  ~
j (pCi/kg dry)                                 I Loeation-    1932     1933     1932      193H    1111  1932    1932   1914.
Backaround Cs-137         342       369      708      280      418  428     335    452 Eu-154                                                     72                   ;
A                                                                                <
Mn-54         1684      '183      513 i
Fe-59          430 Co-58          270
                                                                                                )
Co-60         6202     3628     4627      2567    1312  1733     961    835     l' Zn-65         3118       631 Sb-125         658 Cs-134       10892     3642     3153      1400      576  718     326    229 Cs-137       19813    10708    12790      7667    5010  9763    4073   3855 B
Mn-54           74 Co-60          168        61       74         68     58    35     62 Zn-65          165 Cs-134         680       218     '296      100 Cs-137        1390       743      896      800      277  106     215    163 H
Mn-54           23 Co-60                     38       61 Cs-134         490       264      248         43 Cs-137        1100       955      999      455      136    44           524 i-

      ",~   .
Table 2 (Sheet 2 of 2)                              ;
Average. Activity of Manmade Radionuclides Found in Samples l Collected at Select Locations in-.Each of the Following Years (pC1/kg dry)                                 ,
Loeation     ]3HZ    1933      19]L9     1933     1931    1992  1933      1914 e
New H Co-60                                                             72 Cs-134                                                            70              ;
Cs-137                                                          1765      1235' El d Co-60                   27                          49 Cs-134         194      67                 145 Cs-137       1457      927        558    1450     1205     916   582       650 EL.3 Mn-54           24 Cs-134         340-     91         84 Cs-137-      1488      862         76     870      967     288   128-      134 MEC.
Mn-54           47 Co-60           68      34                  34      48      70    90       134     )
Zn-65           95 Cs-134         331     224 Cs-137         807     556        419      280     298     304   377       266 i
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Table 3 Activity of Cs-137 Found in Each Sample-Collected at Other Locations During 1994 (pCi/kg. dry)
Location Sample No.          1                     2 D                   1490                  1300 E                   1420                  1570                         ,
F                   1260                  1180.
G                   1700                  1730                         .
I                   1210                  1110 J                     351                   352 K                    '145                   394                        ,
L                   1010                    602 Z                     214                   181 PL-1                  170                   204 NOTE:               No other manmade radionuclides were found in these samples.
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E Table 4 (Sheet 1 of 2)
Average Activity.of Manmade Radionuclides Found In        .
Samples Collected At Other Locations During 1987 and .1994   ,
(pC1/kg dry)                        t Loeation                   1931,                  1921 D                                                          [
Mn-54                         62 Co-60                        168 Cs-134                      720 Cs-137                     1505                   1395-l E
Mn-54                         45                         g Co-60                        137                           i Zn-65                        220
                                                                                    .{
Cs-134                     1645                            :
Cs-137                     4050                   1495 i
E                                                          $
Mn-54                         73 Co-60                         85                          i Zn-65                         97 Cs-134 l
745                           ;
Cs-137                     2350                  ~1220 I
G Mn-54                         80 Co-60                       320                            ;
Zn-65                       455 Cs-134
                                                                                     ]
4250 Cs-137                     8800                   1715 1
1                                                          )
Mn-54                         45
                                                                                      )
Co-60                         27                           j Zn-65                        110                           ;
Cs-134                     1800                            I Cs-137                     3900                   1160

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Table 4 (Sheet 2 of 2)                     l Average Activity of Manmade Radionuclides Found In.          #
Samples Collected.At Other Locations During 1987 and 1994       .
(pC1/kg dry).
Location                 193 1               1931           j i
d                                                            i Mn-54                          23.                        ..
Cs-134                   1000 Cs-137                   3000                 352            .
                           .K.
Co-60                          76 Cs-134                   1100                                :
Cs-;37                   2530                 270 L
Co                         36 Cs-134                   1260                                ,
Cs-137                   3130                 806 Z                                                         '!
Co-60                          57                            l Cs-134                      341 Cs-137                   1250                 198            ;
EL 1                                                         !
Cs 134                      308                              i Cs-137                   2810                 187 1
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