ML20210A468
| ML20210A468 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 01/31/1987 |
| From: | Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20210A474 | List: |
| References | |
| 4410-87-L-0006, 4410-87-L-6, NUDOCS 8702060479 | |
| Download: ML20210A468 (14) | |
Text
GPU Nuclear Corporation Nuclear :::,ome:s 48o Middletown, Pennsylvania 17057-0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
(717) 948-8461 4410-87-L-0006 Document ID 0139P 1
January , 1987 Document Control Desk US Nuclear Regulatory Commission Washington, DC 20555
Dear Sirs:
Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. OPR-73 Docket No. 50-320 Groundwater Monitoring The following is a report of the results of the groundwater monitoring program which is conducted in the vicinity of TMI-2 to detect leakage of radioactive water to the groundwater. This report covers the period through June 1986.
The Radiological Environmental Program Report will provide updated data from July 1986 to December 1986 when submitted during the Second Quarter of 1987.
Groundwater Monitoring The following groundwater monitoring data is attached.
- 1. Computer graphs of tritium concentrations for monitoring and observation stations.
- 2. Computer graphs of the water levels within the monitoring and observation stations.
- 3. A graph indicating the gamma scan data from monitoring station MS-2 sample analysis.
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B702060479 870131 PDR R
ADOCK 05000320 PDR f// /
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GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation a v: nM h>Rtb/AD7=s ;
Document Control Desk January 31, 1987 4410-87-L-0006
- 4. A composite drawing which depicts all monitoring locations with a corresponding graph of the tritium concentrations reported for each station.
Tritium activities remair.ed steady during the period with the range for all stations varying from <LLD (4100 picocuries per liter) in the control station to a maximum of 17,000 picocuries per liter in a station near the Unit 2 BWST. Stations MS-2, MS-3, OS-10, 05-16, and OS-17, which are located nearest the Unit 2 Borated Water Storage Tank (BWST), continue to reflect the highest
- tritium concentrations. All groundwater tritium activity measured during this reporting period was below the EPA drinking water standard as well as the t
limit defined in 10 CFR 20 Table II.
Gamma analyses showed only naturally occurring radionuclides in all stations
. except for MS-2. The bo11down analysis of the MS-2 sample showed positive i
Cesium-137 indication for January and June at 4.2 and 3.3 picocuries per liter, respectively. The boildown analysis is intended to provide data on the distribution of the activity in the liquid or suspended solids. However, since the boildown concentrates both the dissolved and suspended activity, i this activity may be associated with suspended solids in the groundwater.
- Gross beta results varied between about 1 and 50 picocuries per liter with no '
apparent pattern. The higher values did not correspond to detection from the same stations month to month. The gross beta results are most likely strongly l affected by natural activity in the water, both dissolved and suspended, and as such, and in connection with the variability of the results, do not represent a realistic assessment of the impact of TMI-2 on the groundwater.
The gross alpha analyses resulted in only two positive results, one of 9.4 picocuries per liter in station OS-17 and one of 5.9 picocuries per liter in the east dike catch basin (EDCB). The remainder of the results were all 4LLD
- (<5 picocuries per liter). The positive alpha results were attributed to 4
naturally occurring activity. Since the gross alpha analysis does not differentiate between natural and reactor-produced activity and no fission products were detected in the samples with the gross alpha activity, it is extremely unlikely that the activity would be reactor-related.
1 The single positive strontium-90 result was in station OS-16 during the second j quarter. All other results were <LLD (41 picocurie per liter). It is likely that this strontium-90 activity is related to previous BWST leaks or it may be associated with sediment as the samples from OS-16 are frequently sediment-laden.
In conclusion, the TMI-2 groundwater activity remains essentially stable with tritium at slightly lower activity than the first half of 1985. The groundwater analyses for the first half of 1986 indicate that groundwater
- activity on TMI currently is below all applicable EPA drinking water limits, as well as the limits of 10 CFR Part 20.
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Document Control Desk January , 1987 4410-87-L-0006 Groundwater Sampling Program Modifications Effective August 1986, the following changes were made to the groundwater monitoring program to eliminate analyses which were not providing useful data.
o The monthly gamma isotopic analysis has been replaced with a quarterly composite analysis. The tritium activity in the groundwater, as detected by a monthly analysis, is the best indicator of groundwater flow and new contamination since it is present in the highest concentrations and moves most readily with the groundwater. Additionally, the majority of the Unit 2 water sources that have a possible pathway to the groundwater are dominated by tritium activity. Should the monthly tritium analyses indicate a significant increase in tritium activity, a gamma analysis will be performed as a follow-up, o The monthly gross beta analysis has been eliminated. Since tritium is the best indicator of TMI-related radioactive material in the groundwater and because the gross beta result is severely affected by naturally occurring activity, the beta analysis provides no usable data, o The quarterly gross alpha analysis has been elimirated. This analysis was affected by naturally occurring activity. The strontium-90 or gamma analysis will indicate the presence of TMI-related isotopes other than tritium at much lower activity levels than gross alpha analysis, o The boildown analysis of station MS-2 has been eliminated. The original intent of the boildown analysis was to differentiate between dissolved activity and suspended solids. However, the boildown analyses does not provide this data as the boildown effectively concentrates any material in the sample whether dissolved or suspended. All samples will now be filtered prior to analysis to reduce interferences from sediment.
o Stations OS-9 and OS-15, which are blocked and usually dry, will be inspected quarterly. If water is present, they will be sampled at the time of the quarterly inspection.
A summary of the current groundwater monitoring program is as follows:
Sixteen On-site Stations - MS-1 through 8, 0S-10, OS-13b, 05-14, OS-16, 05-17 and the EDCB all receive monthly tritium analysis, quarterly gamma composite, and quarterly strontium-89/90 analysis. OS-9 and 05-15 are checked quarterly and, if water is present, will receive tritium, gamma, and strontium-89/90 on the quarterly sample.
Sincerely,
- r. R. Standerfe Director, TMI-2 FRS/CJD/eml cc: Regional Administrator - Region 1, Dr. T. E. Murley Director - TNI-2 Cleanup Project Directorate, Dr. W. D. Travers
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OVERSIZE DOCUMENT PAGE PULLED SEE APERTURE CARDS i
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