ML101940220
| ML101940220 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 05/01/2009 |
| From: | Progress Energy Co |
| To: | Office of Information Services |
| References | |
| FOIA/PA-2010-0209 | |
| Download: ML101940220 (27) | |
Text
BRUNSWICK STEAM ELECTRIC PLANT Status of Tritium Contamination As a result of past operations, residual plumes of tritiated water having concentrations exceeding the EPA drinking water limits [20,000 picoCuries.per liter (pCi/I)] exist in the shallow aquifer within the owner controlled areas.
The ultimate source of the elevated tritium (H-3) was the discharge of turbine building (TB) chiller condensate which contained H-3 resulting from extensive steam leaks to the TB atmosphere. Condensate released from the TB chillers contained H-3 concentrations exceeding 1 E+6 pCi/I. The chiller condensate was routed through storm drain piping (non-radioactive waste piping) to a storm drain stabilization basin and ultimately to the storm drain stabilization pond (SDSP). In CY 2007, the licensee stopped TB chiller condensate releases to the storm drain piping by routing the equipment discharge to the onsite radioactive waste (radwaste) system. The majority of sources for unmonitored tritium release to the subsurface aquifer currently appear to be addressed. However, residual water pumped from onsite-seismic structural gaps continue to have quantifiable tritium which continues to be discharged through the storm drain system.
Batch releases from the SDSP are described in the ODCM as part of the licensee's normal effluent pathways with those discharges made to the intake canal. However, until calendar year (CY) 2007, the licensee failed to recognize the potential unmonitored movement/discharge of tritiated water to the subsurface aquifer from the storm drain piping, from downward migration of SDSP water, or through evaporative processes to the surrounding environs. The licensee currently is monitoring and continuing to evaluate offsite doses from all of those pathways. To date, calculated release concentrations and resultant doses to offsite locations are significantly less than 10 CFR Part 20 Appendix B or 10 CFR Part 50 Appendix I criteria.
As a result of many years of direct releases of TB chiller effluents ultimately to the SDSP, the licensee has identified two distinct areas, beneath the SDSP and beneath the switch yard.
where subsurface (shallow) plumes of tritiated water exceeding the EPA drinking water limit exist. Sampling wells in the shallow, intermediate, and deep aquifer established to monitor discharges from the SDSP have confirmed that all tritium concentrations exceeding EPA drinking water limits remain confined to the shallow aquifer within the owner controlled property and are not currently having a significant impact on offsite locations, or on the drinking water supply for the local population. However, to mitigate any potential future problems from the SDSP, the licensee is moving forward with extensive active remediation activities including construction of a new double-lined stabilization pond, recovery of the contaminated water beneath the SDSP, and subsequent release of the resultant liquid through normal liquid effluent process pathways. The effort is planned for the next several years and currently is awaiting approval from the State of North Carolina to construct a new stabilization pond.
The licensee is exploring a second discrete plume located w/in the switchyard area but the investigation has just begun to map and determine the exact magnitude of this plume. Once additional data are available, the licensee decide any remediation activities for this plume.
Brunswick Plant Lands Miles 0
0.5 1
2
Storm Drain Collection Basin H-3, pCilL I.OOOE+07 1.OOOE+08 I.OOOE+05 CL I.OOOE+04 I.OOOE+03 1.OOOE+02 I.OOOE+01 1.OOOE+00 1.....-
8/1/04 2/17/05 9/5/05 3/24/06 10/10/06 4/28/07 11/14/07 6/1/08 12/18/08 7/6*/09
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Basin and Pond Data
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Storm Drain Stabilization Pond H-3, pCi/L 1.OOOE+06 L.OOOE+05 1.OaOE+04 CL 1.OOOE+03 1.OOOE+02 1.OOOE+02.
1.000E+00 4-8/1/04 2/17/05 9/5/05 3/24/06 10/10/06 4/28/07 11/14/07 6/1/08 Storm Drain Stabilization Pond H-3, pCi/L 12/18/08 7/6/09
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Basin and Pond Data
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0 250 500 1000 1500
WP-61: 2110109 H-3 ND WP-64: 2110109 H-3 ND Canal SDSP WP-60: 2110109 H-3 ND WP-59: 2110109 H-3 ND C
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Marsh and River Samples
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Waypoints 52, 53, 55, and 57 in Nancy's Creek 10 0 0 950 900 850 800 750 700 650 600 550 500 450 400 350 300 250
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2 Groundwater Well Sample Results Progrm Energy
Shallow Wells 23C, 26C, and 27C Near Pond CL 800,000 700,000 600,000 500,000 400,000 300,000 200,000 100,000 4/28/07 7/7/07 9/15/07 11/24107 2/2/08 4/12/08 6/21/08 8/30/08 11/8/08 1/17/09 3/28/09
-'-ESS-23C -U-ESS-26C
-*-ESS-27C 4
Groundwater Well Sample Results Progress Energy
Progress Energy 5
Groundwater Well Sample Results
Well ESS-STAB Inside Pond 800,000 700,000 600,000 500,000 400,000 300,000 200,000 100,000
- 0.
4/28/07 7/7/07 9115/07 11/24107 2/2/08 4/12/08 6/21/08 8/30/08 11/8/08 1/17109 3/28/09 8
Groundwater Well Sample Results r
SPrEnergy
Latest Shallow Well Data ESS-17C 26 1/15/09 4,240 ESS-1 8C 20 1/19/09 546,400 ESS-1 9C 20 1/19/09 525,500 ESS-20C 20.5 1/19/09 19,000 ESS-21 C 20 1/8/09 474 ESS-22C 20 1/15/09 498,400 ESS-23C 23 1/20/09 190,400 ESS-24C 18 1/15/09 4,571 ESS-25C 22 1/22/09
<LLD ESS-26C 15 1/20/09 298,300 ESS-27C 15.5 1/20/09 268,600 ESS-28C 23 1/20/09 309 ESS-30C 15 1/15/09 1,473 ESS-31C 15 1/15/09
<LLD ESS-STAB 31 1/19/09 65,777 9
Groundwater Well Sample Results M.N Progress Energy
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Intermediate Well 19B Near Pond 70,000 65,000 60,000 55,000 50,000 45,000 40,000 A-LO
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04/28/07 08/06/07 11/14/07 02o22/08 06/01/08 09109/08 12/18/08 03128/09
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Latest Intermediate Well Sample Data ESS-17B 53 1/15/09
<LLD
,ESS-18B 63 1/19/09
<LLD ESS-19B 42 1/19/09 44,240 ESS-20B 43 11/19/09
<LLD ESS-21B 67 1/15/09
<LLD ESS-22B 76 1/15/09
<LLD ESS-24B 53 1/15/09
<LLD ESS-25B 43 1/22/09
<LLD 17 Groundwater Well Sample Results Progress Energy
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18 Groundwater Well Sample Results PMro Egy
Deep Wells 17A, 24A, and 27A Near Pond
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500 450 400 350 300 250 200 150 100 50 0
10/10/06 4/28/07 11/14/07 6/1/08 12/18/08
-.-ESS-17A --- ESS-24A -*-ESS-27A 7/6/09 C% Progress Energy 19 Groundwater Well Sample Results
Latest Deep Well Sample Data r " -
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<LLD ESS-27A 140 1/19/09
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- J Progress Energy 20 Groundwater Well Sample Results
24 Groundwater Well Sample Results i
ProgwEnegy
Switchyard Area Wells from Historical Radwaste Line Leak, Well 2C 1.OOOE+08 1.OOOE+07 1.OOOE+06 I.OOOE+05 1.OOOE+04 1.OOOE+03 1.OOOE+02 1.OOOE+01 6115/94 102895 3111/97 74/98 12/6/99 4/19/01 9/1/02 1/14/04 5r28/05 10/10/06 2/22/08 7/6/09 25 Groundwater Well Sample Results P roEnr
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