ML061160481
| ML061160481 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 12/20/2005 |
| From: | Entergy Nuclear Operations |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2006-0081 | |
| Download: ML061160481 (2) | |
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December 20O. 2005 intormation in) this record was deieted in accordance the d of10 WW A~=1 Entergy Obtains Results from Transformer Yard Monitoring Wells Entergy has expanded the ground water sampling program at Indian Point to include news wells and testing of existing storm drain systems. The expanded testing program is in response to the identification of a small hairline crack on the outside wall of the IP2 spent fuel pool found during excavation in the fuel storage building loading bay.
Over the past several weeks three new wells have been drilled in the IP2 transformer yard near an existing well (MW-Ill) which showed tritium concentrations (250,000 pCi/L) about an order of magnitude above EPA drinking water standards (20,000 pCi/L). Tests results from these wells are shown in the table below:
- New monitoring well installed in the1lP2 transformeryard.
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Sample Date MW-34 12/13/2005 MW-35 12/13/2005 MW-33 12/15/2005 See attached map for locations Locaion I
Transfrmer YardJ Transforme.ar~J ITransformer Yr Tritium 63,900 pCUI 42,300 pCUI 142.000 pCUli E
These results are above drinking water standards but below the levels found in MW-1 11. No other isotopes characteristic of spent fuel pool water was found in any of these sample results. These wells are test wells and are not part of any drinking water system and do not pose a threat to workers or the general public. These wells will continue to be sampled as results can vary due to environmental conditions especially rainfall, at the time the sample is drawn.
Storm Water Drains Now Included in Test Program In order to develop a comprehensive data set that will lead to a conceptual model of ground water movement on site, samples for tritium were taken from the storm drains in and adjacent to the transformer yard.
Test results showed detectable levels for tritium in the storm drains ranging from less than 2000 pCi/L in sample locations 17, 18 and 19 to a high of between 12,000 and 51,000 pCi/L at sample location MHI-6 near monitoring well MW-11. The remaining wells tested between 2000 and 5300 pCi/L. Storm drains at Indian Point flow into the discharge canal.
Discharges from the canal are monitored as part of the Radiological Environmental Monitoring Program, which is reported to the Nuclear Regulatory Commission. Sample results from these storm drain systems will be incorporated into the broader monitoring program.
t77, i,$c77 Coseup. of area map showing iransfqrmer yard wells and storm drains. Green Mines are storm drains.
Liner Inspection The video inspection of Unit 2's spent fuel pool stainless steel liner has revealed three additional areas where' potential defects will be examined. Tile potential defects are located on the north and west wall of the spent fuel pcol. Two of the areas appear to be pinholes and the third appears to be'a small gash in the liner.
These areas have been surveyed for radiation levels and will be vacuum box tested for through wall leaks similar to three,areas in the cask loading' area of the pool.
First Test Results from Entergy, NRC, NYS Split Samples As monitoring wells are being developed, Entergy, New York State and the NRC are taking split samples, which are analyzed for tritium, gamma emitters and Sr-90. Entergy's samples are sent to an EPA qualified lab at FitzPatrick for analysis where highly sensitive analyeis can be performed at lower limits of detection. A split sample taken from MW-38, a new well installed near the IP3 turbine building at the south end of the site, has shown trace amounts of tritium (980 pCi/L). Two previous samples analyzed at Indian Point showed no detectable activity. Fitzpatrick's more sensitive equipment has a Lower Limit of Detection at 500 pCi/L verses the LLD for IPEC of 1000 pCi/L. The New York State sample was tested at the Department of Health's Wadsworth Lab in Albany. Their sample was generally consistent with Entergy's showing about 700 pCi/L. The NRC is using the national lab at Oak Ridge. Samples results from the NRC should be available in a couple of weeks. No isotopes other than tritium were found in the samples.
Off-Site Samples Show No Tritium Entergy has sampled nearby wells, drinking water supplies and outfalls.
No tritium or other radionuclides have been found in any off-site location. Split samples among Entergy, NYS and NRC were taken at many of these locations.
iIN Date Location
' Tritium Results 10/18/05 Croton Reservoir None Detectable Camp Field Reservoir 10/20/05 Gypsum None Detectable Algonquin 5th Street Well 10/25/05 Rock Quarry None Detectable 1118/05 5t Street Well None Detectable 11/30/05 Gypsum None Detectable Algonquin 5th Street Well Rock Quarry Croton Reservoir Camp Field Reservoir