ML20082T753

Corrected 1990 Annual Radiological Environ Operating Rept Wolf Creek Generating Station

ML20082T753
Person / Time
Site:	Wolf Creek
Issue date:	12/31/1990
From:	WOLF CREEK NUCLEAR OPERATING CORP.
To:
Shared Package
ML20082T694	List: ML20082T690 ML20082T706 ML20082T713 ML20082T739 ML20082T744 ML20082T753
References
NUDOCS 9505040159
Download: ML20082T753 (5)

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Drinking water sampling locations are at the water treatment stations for the towns of Burlingtor (upstream control location) and LeRoy (downstream indicator location) Surface water sampling locations are at the John Redmond Reservoir outfall (control), Wolf Creek Cooling Lake discharge cove (indicator) , and Wolf Creek Cooling Lake main dam (indicator) . Ground water is sampled from three wells located hydrologically downgradient from Wolf Creek Cooling Lake and from an upgradient control well. All water sampling locations are listed in Table 2 and shown in Figures 2 and 5.

Shoreline and Bottom Sediment:

Semiannual samples of shoreline and bottom sediment were collected from the discharge cove area (location "DC" on Figure 3) of Wolf Creek Cooling Lake.

Control samples were added for shoreline and bottom sediment at John Redmond Reservoir during the last half of 1990. Also, special bottom sediment samples were obtained in the Ultimate Heat Sink (URS). Gamma analysis was performed l on each sample.

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Aquatic Vegetation / Algae:

l Semiannual samples of aquatic vegetation / algae were collected from the discharge cove area (location "DC" on Figure 3) of Wolf Creek Cooling Lake.

Gamma analysis was performed on each sample.

Ingestion; l Milk:

Milk samples were collected on a semi-monthly basis from April through November (while milk animals were on pasture grass) and on a monthly basis the remainder of the year (when animals were on stored feed). Samples were sent to Teledyne Isotopes where radiochemical analyses for I-131 and gamma analyses were performed on each sample. Location is shown on Figure 5. l Broadleaf Vegetation and Irrigated Crops:

Broadleaf vegetation samples were collected monthly during the growing season.

Alternate sampling locations were also used when quantities of vegetation were limited, such as early or late in the growing season or during dry periods.

Additionally, samples of crops irrigated with water from the Neosho River upstream and downstream of the discharge from Wolf Creek Cooling Lake were collected during harvest. All vegetation samples were sent to Teledyne Isotopes and analyzed by gamma spectroscopy. Locations are shown in Figures 4 and 5.

1990 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING P2 PORT WOLF CREEK GENERATING STATION Rev. 4/95 9505040159 950426 PAGE 4 OF 50 PDR ADOCK 05000482 R PDR

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TT. DISCUSSION OF RESULTS I

Analysis results for all pathways are summarized in Appendix A using the j format described in NRC Radiological Assessment Branch Technical Position, i Revision 1, November 1979; results for individual samples are listed in  :

Appendix B. [

In this section, results are discussed by pathway and analysis type.

Operational results are related to control location results, preoperational i values, sources of radioactivity, and effluent releases when applicable. i Trends or seasonal effects seen in the data are also discussed.  !

t Airborne: j i

Results of gross beta analysis of weekly air particulate filters are shown in Table 3. In addition, the four indicator locations are averaged and plotted i graphically with the control location in Figure 6. Finally, Figure 7 shows the percent of the indicator average to the control location measurement. .

Both of these figures demonstrate how closely the indicator and control l locations track together. r i

Results from the weekly analysis of charcoal filters for I-131 showed no  !

concentration above the detection limit during the year.

Results of the quarterly gamma analysis of air particulate filter composites l are summarized in Table 4, which shows that naturally occurring Be-7 and K-40, j were detected regularly, as was the case during preoperational monitoring. j i

No effects of plant operation were seen via the airborne pathway for the year.  ;

Direct Radiation:  !

Quarterly gamma exposures measured at each location for 1990 are shown in l f Table 5. Values are normalized to a standard 90-day quarter.

Results from TLDs located near the plant site (less than approximately three {

mile distance) , which would be most sensitive to changes due to plant l operation, were combined into quarterly averages. These nearsite averages l

using locations 1, 2, 7, 8, 9, 10, 11, 12, 13, 14, 18, 25, 27, 28, 29, 30, 37,  ;

and 38, are compared to control TLD (locations 39 and 40) results in Figure 8.  ;

In addition, the percentage of the nearsite averages to the control locations  :

results are displayed graphically in Figure 9. These figures also include {

preoperational data for comparison, j A change has been made to the shialding thickness used with the TLDs. The f i

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1990 ANNUAL RADIOLOGICAL ENVIRON!4 ENTAL OPERATING REPORT I

WOLF CREEK GENERATING STATION Rev. 4/95 I PAGE 6 OF 50

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l Figure 11, WCCL tritium concentrations are plotted since WCGS began operation.

It can be seen in Figure 11 that monthly surface water tritium concentrations  ;

appear to be slightly increasing since plant startup. This is expected until '

the lake concentration reaches equilibrium. .( See discussion on equilibrium concentrations in Appendix C, page C-4.)

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A peak concentration of 9,000 pCi/ liter occurred in November when the monthly j grab sample was obtained shortly after the termination of a batch release. l Since the sample point is just beyond the near field mixing zone, complete

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mixing had not occurred. The peak concentration is seen in Table 7 and Figure j

11. j All tritium concentrations measured were below applicable reporting levels.

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There were no gamma emitters related to plant operation detected in surface water for the year.

I An additional surface water location was added to the sample collections in- {

August in preparation for moving the location along the WCCL Main Dam several I yards east of the present location. The new location is beside the auxiliary [

spillway which allows discharges into Wolf Creek. The results obtained from August through December indicate moving the sample location will not have any l' affect on the analysis results.

Ground Water:

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No tritium or gamma emitters were detected in any of the quarterly ground j water samples in 1990. I i

Shoreline Sediment:

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Table 8 shows gamma emitters detected in shoreline sediment collected from Wolf Creek Cooling Lake and John Redmond Reservoir during 1990. In addition to the naturally occurring nuclides (K-40, Ra-226, and Th-228), two other l l radionuclides were detected.

Co-60, an activation product, was detected in the samples collected on October 16, 1990 and April 17, 1990. This activity is attributed to plant operations rather than fallout from nuclear weapons testing.

The other nuclide, Cs-137, was detected in a sample but the activity measured l is considered to be primarily due to fallout rather than plant operations since the concentration is at or below preoperation concentrations. Also, Cs-134 was not detected, although it would be expected if the occurrence of.Cs-137 was related to plant operation.

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1990 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT WOLF CREEK GENERATING STATION Rev. 4/95 ,

PAGE 8 OF 50 1

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TABLE 3 .

I 1990 AIR PARTICULATE SAMPLES f GROSS BETA ANALYSIS RESULTS' ,

i (pCi/m')

i li INDICATOR LOCATIONS INDICATOR STANDARD ' CONTROL ,f DATE LOC 2 IDC 3 LOC 32 LOC 37 AVERAGE DEVIATION LOC 40  !

1/2-1/9 .033 .038 .032 .034 .0343- .0026 .031 j 1/9-1/16 .024 .027 .023 .024 .0245 .0017 .021 l .

1/16-1/23 .050 .047 .045 .050 .0480 .0024 .043 1/23-1/30_ .026 .026 .026 .010 .0220 .0080 .024 {

1/30-2/6 .035 .036 .032 .034 .0343 .0017 .034 l 2/6-2/13 .032 .031 .034 .031 .0320 .0014 .032 j 2/13-2/20 .033 .031 .033 .033 .0325 .0010 .033 l 2/20-2/27 .026 .025 .028 .031 .0275 .0026 .029 2/27-3/6 .033 .029 .032 .033 .0318 .0019 .032 f

3/6-3/13 .023 .024 .026 .020 .0232 .0025 .023 3/13-3/20 .021 .019 .019 .023 .0205- .0019 .021 3/20-3/27 .025 .029 .032 .029 0288 .0029 .030 l

'I 3/27-4/3 .015 .017 .014 .025 .0178 .0050 .024  !

4/3-4/10 .027 .029 .024 .028 .0270 .0022 .029 l 4/10-4/17 .027 .025 .032 .034 .0295 .0042 .033 j 4/17-4/24 .026 .024 .027 .024 .0253 .0015 .024 l 4/24-5/1 .0A8 .015 .019 .020 .0180 .0022 .015  ;

5/1-5/8 .023 .022 .025 .023 .0232 .0C13 .020 [

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5/8-5/15 .019 .018 .020 .019 .0190 .0008 .019 i 5/15-5/22 .019 .021 .021 .024 .0213 .0021 .021 5/22-5/29 .027 .022 .029 .024 .0255 .0031 .024 5/29-6/15 .022 .022 .023 .022 .0222 .0005 .023 t 6/5-6/12 .021 .021 .020 .022 .0210 .0008 .024 6/12-6/19 .019 .021 .019 .022 .0203 .0015 .021 -l l

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1990 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT WOLF CREEK GENERATING STATION [

Rev. 4/95 PAGE 26 OF 50 j

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TABLE 8 BOTTOM SEDIMENT / SHORELINE SOIL GAMMA ANALYSIS RESULTS (pci/ gram - dry weight)

INDICATOR CONTROL WCCL JRR DATE SAMPLE TYPE NUCLIDE CONCENTRATION CONCENTRATION 4/17/90 Shoreline Soil K-40 9.96 11.00 N/A Discharge Cove Co-60 0.177 10.029 N/A Ra-226 1.58 10.51 N/A Th-228 1.14 10.11 N/A 6/26/90 Bottom Sediment K-40 12.2 11.2 N/A Discharge Cove Co-58 0.0686 10.0402 N/A Co-60 0.345 10.054 N/A Cs-137 0.411 10.047 N/A Ra-226 1.57 10.55 N/A Th-228 1.32 10.13 N/A 6/27/90 Bottom Sediment K-40 12.5 11.3 N/A Ultimate Heat Co-60 0.0802 10.0266 N/A l Sink Canal Cs-137 0.311 10.031 N/A Ra-226 2.05 10.36 N/A Th-228 1.11 10.11 N/A 6/27/90 Bottom Sediment K-40 12.3 11.2 N/A Ultimate Heat Co-60 0.0728 10.0323 N/A Sink Dam Area Cs-137 0.555 10.056 N/A Ra-226 2.66 10.6 N/A Th-228 1.51 10.15 N/A 9/25/90 Bottom Sediment K-40 11.3 11.1 N/A Discharge Cove Co-60 0.253 AO.049 N/A Cs-137 0.280 10.034 N/A Ra-226 1.37 10.75 N/A Th-228 1.12 0.11 N/A 10/1/90 Bottom Sediment K-40 N/A 14.7 11.5 l John Redmond Cs-137 N/A 0.188 10.019 Reservoir Ra-226 N/A 1.82 10.37 Th-228 N/A 1.46 10.15 1990 ANNUAL RADIOLOGICAL DNIRONMENTAL OPERATING REPORT WOLF CREEK GENERATING STATION Rev. 4/95 PAGE 34 OF 50