ML20003B818
| ML20003B818 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/20/1981 |
| From: | Hovey G METROPOLITAN EDISON CO. |
| To: | Barrett L Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20003B819 | List: |
| References | |
| LL2-81-0042, LL2-81-42, NUDOCS 8102250623 | |
| Download: ML20003B818 (4) | |
Text
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Metropoistan Edison Company Post Office Box 480 g
Middletown, Pennsylvania 17057 Wnter's oirect Dial Number February 20, 1981 LL2-81-0042 TMI Program Office 2.,
Attn: Mr. Lake Barrett, Deputy Director U. 5. Nuclear Regulatory Commission
- /o Three Mile Isla-d Nuclear Station Middletewn, Pennsylvania 17057
Dear Sir:
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Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Three Mile Island Groundwater Monitoring Program Attached are the groundwater monitoring data updated to include the period of November 12, 1980 to December 24, 1980. This is a continuation of periodic reporting, formctly directed to Mr. Carlyle Westland of Pennsylvania Department of Environmental Resources.
The gamma scan results are shown in Table 1.
Well samples fr cm MW-2, CW-14, and OW-16 had detectable cesium levels. All other well samples had nondetectable levels.
The computer graphs of tritium concentrations differ from those of previous reports in that the same tritium scale is used for all graphs.
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This change has been made to provide better perspective of relative tritium concentrations for the monitoring well array. Attached also f
is an initial draft of composite drawing showing all well locations with the graph of tritium concentrations for each well. This is j j provided to give a perspective of the total site tritium distribution.
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Most tritium concentrations remained fairly constant over the reporting period. However, MW-2 tritium concentrations indicate a downward trend and MW-3 indicates an upward trend. This suggests a stablization of levels in the area after the perturbation caused by the extended pump testing done in August and September of 1980. The tritium levels in MW-3 are expected to increase after MW-2 because it is on the hydraulic gradient downstream from MW-2.
A preliminary assessment of potential sources of radionuclides found in the ground of TMI will be forwarded to you shortly.
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2-LL2-81-0042 Mr. Lake Barrett If you have any questions, please contact Mr. J. C. Devine, Jr. at 948-8313.
Sincerely, u -
. K. Hovey Vice-President and l
Director, TMI-2 GKH:JJB:dib cc:
B. J. Snyder, Program Director-TMI Office s
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HISTORY OF CROUND'4ATER PROGRAM AT TMI In January 1980, the development of eight wells to monitor groundwater quality at TMI began.
Five of the monitoring wells were located around the Unit 2 containmec.t structure with two additional wells placed outside the Unit 2 secured area fence.
An eighth well was located at the north end of the Island.
During the development of each monitoring well, groundwater samples were obtained for tritium and gamma isotopic analyses. With the complete installation of the eight monitoring wells in April 1980, groundwater sampling on a weekly basis was initiated.
In addition to the monitoring wells, seven observation wells were drilled during the end of April and beginning of May 1980.
Six of the observation wells are located inside the Unit 2 secured area while a seventh is positioned at the south end of the Island.
During the first week of May 1980, the groundwater monitoring program was expanded to include the observation wells as sampling locations.
Consequently, fifteen wells are now sampled on a weekly basis to monitor groundwater conditions at TMI.
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