ML090960657
| ML090960657 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 03/26/2009 |
| From: | Mcnabb D Florida Power & Light Co, McNabb Hydrogeologic Consulting |
| To: | Office of New Reactors |
| Nguyen C NRO/DNRL 301-415-1177 | |
| References | |
| Download: ML090960657 (25) | |
Text
Turkey Point Units 6 & 7 Underground Injection Control David McNabb, P.G.
McNabb Hydrogeologic Consulting, Inc.
March 26, 2009
2 The information provided in the following presentation is of a preliminary nature and is considered DRAFT
3 Provide the NRC with an overview of the use and success of Underground Injection Control (UIC) in Florida
- General UIC Information
- Florida UIC Permitting Process
- UIC Design, Construction and Testing
- Fluid Migration Detection Agenda
4 1943 - First injection into the Floridan Aquifer took place
- Oil Field Brine 1959 - First injection of municipal effluent into the Upper Floridan Aquifer 1966 - First injection of non-oil field related industrial wastewater into the Lower Floridan Aquifer (Boulder Zone) 1970s - Injection into Upper Floridan ceases and is replaced by injection into the Boulder Zone 1983 - Florida is granted primacy of the States UIC Program Today there are approximately 127 active Class I injection wells in Florida Turkey Point Units 6 & 7 - Underground Injection Control History of Underground Injection in Florida
5 Class I - industrial and municipal disposal wells which inject fluids beneath the lowermost unit containing an underground source of drinking water (USDW)
- Class I Municipal - disposes of treated domestic wastewater
- Class I Industrial - disposes of non-hazardous industrial wastewater Most dispose of treated municipal effluent Many dispose of reverse osmosis (RO) concentrate or a combination of treated wastewater and RO concentrate Power Plant industrial wastewater - primarily cooling tower blowdown Turkey Point Units 6 & 7 - Underground Injection Control Class I Wells
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7 Inject into the Boulder Zone in the Lower Floridan Aquifer Thick confining beds separate the Boulder Zone from the Underground Source of Drinking Water (USDW)
- USDW = an aquifer or its portion that contains water with a total dissolved solids concentration of less than 10,000 mg/L.
- Confinement is low permeability limestone and dolomite
- Typically 800 - 1,000 feet thick
- Vertical hydraulic conductivity typically 10-4 to 10-9 cm/sec Turkey Point Units 6 & 7 - Underground Injection Control Class I Injection Technology
8 Surficial Aquifer Upper Confining Unit Upper Floridan Aquifer Base of Underground Source of Drinking Water Middle Floridan Confining Zone Boulder Zone Surficial Production Well IW-1 DZMW-1
9 The Florida Department of Environmental Protection (FDEP) administers the UIC Program in Florida Chapter 62-528, Florida Administrative Code Technical Advisory Committee (TAC)
- District and Tallahassee FDEP offices, USGS, Water Management District, local Health Department, and USEPA Turkey Point Units 6 & 7 - Underground Injection Control Floridas UIC Permitting Process
10 Floridas UIC Permitting Process - cont.
Exploratory Well Construction Permit
- Well construction to evaluate site geology and hydrogeology Class I Construction Permit
- Conversion of exploratory well to a Class I injection well
- Short-Term injection test
- Operational testing - 6 to 24 months of test operation with increased monitoring requirements Operating Permit
- Allows operation of the Class I injection well system
- Must be renewed every 5 years Turkey Point Units 6 & 7 - Underground Injection Control
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- Multiple concentric casings, 44-, 34-, and 24-inch diameter steel fully cemented casings
- 0.375-inch wall thickness except final casing is seamless 0.5-inch inch and 24-inch diameters casings set below base of USDW
- Fiberglass Reinforced Pipe (FRP) injection tubing
- Protects final casing from corrosion
- Packer at base of FRP isolates FRP-casing annulus
- Annulus filled with corrosion inhibitor 10-inch overdrill on final casing to allow 5-inch cement thickness around casing Turkey Point Units 6 & 7 - Underground Injection Control Injection Well Design
12 Mechanical integrity testing (MIT) is required every 5 years MIT consist of the following
- Video survey - visual inspection of injection tubing, packer and open hole interval
- High-resolution temperature logging - leak detection
- Annular pressure test - test for leaks in tubing, final casing and packer
- Radioactive tracer survey - test the integrity of the cement seal at the base of the final casing
- Interpretation of previous five years of monitoring and operating data Results compiled in report and submitted to FDEP for review and approval Turkey Point Units 6 & 7 - Underground Injection Control Injection Well Mechanical Integrity Test
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- Multiple concentric casings, 24-, 16-, and 6.625-inch diameter casings inch diameter casing is 0.5-inch wall thickness steel, 34-and 24-inch diameter casings are 0.375-inch wall thickness steel
- 6.625-inch diameter casing is FRP to provide corrosion protection
- Monitors two separate zones
- Upper zone monitors just above or at the base of the USDW
- Lower zone monitors below base of the USDW and just above the primary confining unit - typically a few hundred feet below the base of the USDW to provide early warning system Turkey Point Units 6 & 7 - Underground Injection Control Monitor Well Design
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16 Injection Well Drilling Rig Turkey Point Units 6 & 7 - Underground Injection Control
17 12.25-Inch Diameter Pilot Hole Bit Turkey Point Units 6 & 7 - Underground Injection Control
18 58-Inch Diameter Reaming Bit Turkey Point Units 6 & 7 - Underground Injection Control
19 Casing Installation Turkey Point Units 6 & 7 - Underground Injection Control
20 FRP Injection Tubing Installation Turkey Point Units 6 & 7 - Underground Injection Control
21 Class I Injection Wellhead Turkey Point Units 6 & 7 - Underground Injection Control
22 Class I Injection Wellhead Turkey Point Units 6 & 7 - Underground Injection Control
23 Geophysical logs Rock Cores
- Laboratory Analysis of core samples Straddle Packer Testing
- Hydraulic and water quality data Turkey Point Units 6 & 7 - Underground Injection Control Confinement Characterization
24 Monitor well is located less than 150 feet from injection well Monitor well sample collection
- Weekly during operational testing
- Monthly thereafter
- Total dissolved solids, conductivity, chloride, phosphorus, sulfate, sodium, calcium, magnesium, potassium, carbonate, bicarbonate, temperature, pH, gross alpha, radium-226, radium-228 Monitor well water level monitoring Changes in monitor zone water quality and level can indicate vertical migration Turkey Point Units 6 & 7 - Underground Injection Control Vertical Fluid Migration Detection
Closing Questions & Comments