ML071220463

From kanterella
Jump to navigation Jump to search
Enclosure 1 to SBK-L-07074, Effluent Release Data as Required by Regulatory Guide 1.21
ML071220463
Person / Time
Site: Seabrook NextEra Energy icon.png
Issue date: 04/27/2007
From:
Florida Power & Light Energy Seabrook
To:
Office of Nuclear Reactor Regulation
References
FOIA/PA-2010-0209, RG-1.021, SBK-L-07074
Download: ML071220463 (55)
v • d • e


Text

ENCLOSURE 1 TO SBK-L-07074 Effluent Release Data as Required by Regulatory Guide 1.21

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT Supplemental Information 2006 Facility: Seabrook Station Unit 1 Licensee: FPL Energy Seabrook, LLC

1. Regulatory Limits A. Gaseous Effluents
a. 5.0 mrad per quarter gamma air dose.
b. 10.0 mrad per quarter beta air dose.
c. 7.5 mrem per quarter to any organ.

B. Liquid Effluents

a. 1.5 mrem per quarter total body.
b. 5.0 mrem per quarter any organ.
c. 2.OE-04 p[Ci/ml dissolved or entrained gas.
2. Effluent Concentration Limits Provide the ECL's used in determining allowable release rates or concentrations.
a. Fission and activation gases: 10 ECL
b. lodines: 10 ECL
c. Particulates, half-lives >8 days: 10 ECL
d. Liquid Effluents: 10 ECL
3. Average Energy Not applicable
4. Measurements and Approximations of Total Radioactivity Provide the methods used to measure or approximate the total radioactivity in effluents and the methods used to determine radionuclide composition.

A. Fission and activation gases: Determined by gamma spectroscopy. Total error is based on stack flow error, analytical error, and calculated sampling error.

B. lodines: Determined by collection on charcoal with subsequent gamma spectroscopy analysis. Total error is based on stack flow error, analytical error, and calculated sampling error.

C. Particulates: Determined by collection on fixed filter with subsequent gamma spectroscopy analysis. Strontium is determined by composite analysis of filters by liquid scintillation, gross alpha by proportional counter and iron 55 by liquid scintillation. Total error is based on stack flow error, analytical error, and calculated sampling error.

D. Liquid Effluents: Determined by gamma spectroscopy. A composite sample is analyzed for strontium by liquid scintillation, tritium by liquid scintillation, gross alpha by proportional counter and iron 55 by liquid scintillation. Total error is based on the volume discharge error and analytical error.

E. ND: None Detected or No Detectable Activity

5. Batch Releases Provide the following information relating to batch releases of radioactive materials in liquid and gaseous effluents.

A. Liquid

a. Number of batch releases: 154
b. Total time for batch releases: 32018 minutes
c. Maximum time period for batch release: 1059 minutes
d. Average time period for batch release: 208 minutes
e. Minimum time period for batch release: 17 minutes
f. Average stream flow during periods of release of effluents into a flowing stream: 1.53E+06 liters per minute B. Gaseous
a. Number of batch releases: 59
b. Total time for batch releases: 24336 minutes
c. Maximum time period for batch release: 5430 minutes
d. Average time period for batch release: 813 minutes
e. Minimum time period for batch release: 1 minute
6. Abnormal Releases A. Liquid
a. Number of releases: 0
b. Total activity released: N/A B. Gaseous
a. Number of releases: 1
b. Total activity released: 1.05E-03 Curies

TABLE 1A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2006 GASEOUS EFFLUENTS-SUMMATION OF ALL RELEASES Unit Quarter uarter Quarter Quarter Est. Total A. Fission and activation gases

1. Total releases Ci 1._Totalreleases____3.85E-02 9.46E-03 4.63E-02 2.26E-01 1.70E+01
2. Average release rate uCi/sec for period 4.88E-03 1.20E-03 5.87E-03 2.86E-02
3. Percent of applicable Technical Specification  %

limit 1.42E-04 2.68E-04 1.02E-03 8.56E-03 B. lodines

1. Total release Ci ND ND 6.27E-07 7.75E-05 1.50E+01
2. Average release rate uCi/sec for period N/A N/A 7.95E-08 9.82E-06
3. Percent of applicable Technical Specification  %

limit N/A N/A 5.12E-01 3.12E+00 C. Particulates

1. Total release Ci ND ND 5.48E-07 6.21E-05 1.80E+01
2. Average release rate uCilsec for period N/A N/A 6.95E-08 7.87E-06
3. Percent of applicable Technical Specification  %

limit N/A N/A 5.12E-01 3.12E+00

4. Total alpha radioactivity Ci ND ND ND ND D. Tritium
1. Total release Ci 1.22E+01 2.48E+01 2.99E+01 9.19E+01 I 1.60E+01i
2. Average release rate for period uCi/sec 1.55E+00 3.14E+00 3.79E+00 1.16E+01
3. Percent of applicable Technical Specification  %

limit 111.71 E-01 3.33E-01 5.12E-01 3.12E+00

TABLE 1B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2006)

GASEOUS EFFLUENTS-ELEVATED RELEASES BATCH elesed Nucldes nitQuarter Quarter Quarter Quarter Nulie Reesd U 1 1 2 3 4

1. Fission and activation gases argon-41 Ci 4.55E-03 8.85E-03 1.51E-02 2.07E-01 krypton-85 Ci 3.31E-02 ND 2.50E-02 ND krypton-85m Ci ND 2.57E-06 ND 8.16E-04 krypton-87 Ci 2.25E-04 6.01E-04 ND 3.51E-04 krypton-88 Ci 2.35E-04 7.81E-06 ND 8.18E-04 xenon-131m Ci ND ND ND ND xenon-133 Ci 7.33E-06 7.80E-05 1.03E-05 7.31E-03 xenon-133m Ci ND ND ND ND xenon-135 Ci 4.07E-04 5.12E-04 2.50E-04 9.98E-03 xenon-135m Ci ND 5.11E-06 3.67E-04 ND xenon-138 Ci ND ND ND ND Ci unidentified Ci ND ND ND ND Total for period Ci 3.85E-02 1.01 E-02 4.07E-02 2.26E-01
2. Iodines iodine-131 Ci ND ND ND ND iodine-133 Ci ND ND ND ND iodine-135 Ci ND ND ND ND Total for period Ci O.OE+00 0.OOE+00 0.OOE+00 0.OOE+00
3. Particulates strontium-89 Ci ND ND ND ND strontium-90 Ci ND ND ND ND cesium-134 Ci ND ND ND ND cesium-137 Ci ND ND ND ND barium-lanthanum-140 Ci ND ND ND ND Ci unidentified Ci ND ND ND ND Total for period Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00

TABLE 1B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2006)

GASEOUS EFFLUENTS-ELEVATED RELEASES CONTINUOUS Nucide Reeasd Uit Quarter Quarter Quarter Quarter Nulides Releed Uni 1 2 3 4

1. Fission and activation gases argon-41 Ci ND ND ND ND krypton-85 Ci ND ND ND ND krypton-85m Ci ND ND ND ND krypton-87 Ci ND ND ND ND krypton-88 Ci ND ND ND ND xenon-131m Ci ND ND ND ND xenon-133 Ci ND ND ND ND xenon-133m Ci ND ND ND ND xenon-135 Ci ND ND ND ND xenon-135m Ci ND ND ND ND xenon-138 Ci ND ND ND ND Ci Ci unidentified Ci ND ND ND ND Total for period Ci O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+OO
2. Iodines iodine-131 Ci ND ND ND 7.71E-05 iodine-1 33 Ci ND ND ND ND iodine-1 35 Ci ND ND ND ND Total for period Ci O.OOE+00 O.OOE+00 O.OOE+00 7.71E-05
3. Particulates strontium-89 Ci ND ND ND ND strontium-90 Ci ND ND ND ND cesium-134 Ci ND ND ND ND cesium-137 Ci ND ND ND ND barium-lanthanum-140 Ci ND ND ND ND cobalt-58 Ci ND ND ND 7.61 E-06 cobalt-60 Ci ND ND ND ND chromium-51 Ci ND ND ND ND manganese-54 Ci ND ND ND ND niobium-95 Ci ND ND ND ND iron-59 Ci ND ND ND ND unidentified Ci ND ND ND ND Total for period Ci O.OOE+00 O.OOE+00 O.OOE+00 7.61E-06

TABLE IC EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2006)

GASEOUS EFFLUENTS-GROUND LEVEL RELEASES BATCH NuliesRlese Ui Quarter Quarter Quarter Quarter NuieReeae Uni 1 2 3 4

1. Fission and activation gases argon-41 Ci ND ND 5.55E-03 ND krypton-85 Ci ND ND ND ND krypton-85m Ci ND ND ND ND krypton-87 Ci ND ND ND ND krypton-88 Ci ND ND ND ND xenon-131rm Ci ND ND ND ND xenon-133m Ci ND ND ND ND xenon-133 Ci ND ND ND ND xenon-135 Ci ND ND ND ND xenon-135m Ci ND ND 1.07E-05 ND xenon-138 Ci ND ND ND ND Ci Ci unidentified Ci ND ND ND ND Total for period Ci 0.OOE+00 0.OOE+00 5.56E-03 0.00E+00
2. Iodines iodine-131 Ci ND ND ND 4.23E-07 iodine-132 Ci ND ND ND 4.91 E-05 iodine-133 Ci ND ND 6.27E-07 ND iodine-135 Ci ND ND ND ND Total for period Ci 0.OOE+00 0.OOE+00 6.27E-07 4.95E-05
3. Particulates strontium-89 Ci ND ND ND ND strontium-90 Ci ND ND ND ND cesium-134 Ci ND ND ND ND cesium-136 Ci ND ND ND ND cesium-137 Ci ND ND ND 1.26E-08 barium-lanthanum-140 Ci ND ND ND ND cobalt-57 Ci ND ND ND ND cobalt-58 Ci ND ND ND 2.77E-06 cobalt-60 Ci ND ND ND 2.1OE-07 manganese-54 Ci ND ND ND 4.50E-08 iron-59 Ci ND ND ND ND niobium/zirconium-95 Ci ND ND ND 1.69E-07 chromium-51 Ci ND ND ND 1.27E-06 technetium-99m Ci ND ND ND ND bromine-82 Ci ND ND ND ND unidentified Ci ND ND ND ND Total for period Ci 0.OOE+00 0.OOE+00 0.OOE+00 4.48E-06

TABLE iC EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2006)

GASEOUS EFFLUENTS-GROUND LEVEL RELEASES CONTINUOUS Nuclides Relesed Ut OQuarter Quarter Quarter Quarter NcIde Reeae Unit 1 2 3 4

1. Fission and activation gases argon-41 Ci ND ND ND ND krypton-85 Ci ND ND ND ND krypton-85m Ci ND ND ND ND krypton-87 Ci ND ND ND ND krypton-88 Ci ND ND ND ND xenon-133 Ci ND ND ND ND xenon-135 Ci ND ND ND ND xenon-135m Ci ND ND ND ND xenon-138 Ci ND ND ND ND Ci Ci unidentified Ci ND ND ND ND Total for period Ci O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+00
2. Iodines iodine-131 Ci ND ND ND ND iodine-1 33 Ci ND ND ND ND Ci Total for period Ci O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+00
3. Particulates strontium-89 Ci ND ND ND ND strontium-90 Ci ND ND ND ND cesium-134 Ci ND ND ND ND cesium-136 Ci ND ND ND ND cesium-137 Ci ND ND ND ND barium-lanthanum-140 Ci ND ND ND ND cobalt-58 Ci ND ND 5.48E-07 8.76E-07 cobalt-60 Ci ND ND ND ND chromium-51 Ci ND ND ND ND unidentified Ci ND ND ND ND Total for period Ci O.OOE+00 O.OOE+00 5.48E-07 8.76E-07

Groundwater monitoring well Tritium information Well ID. Mar-06 May-06 Jun-06 Jul-06 Aug-06 Sep-06 Oct-06 Nov-06 Dec-06 (uCi/mI) (uCi/mI) (uCi/ml) (uCi/ml) (uCi/ml) (uCi/ml) (uCi/mI) (uCi/ml) (uCi/ml)

BD-1 < 5.92E-07 < 5.98E-07 < 5.73E-07 < 5.80E-07 BD-2 < 5.77E-07 < 5.89E-07 < 5.70E-07 < 6.66E-07 BD-3 < 5.62E-07 < 6.07E-07 < 6.04E-07 < 5.98E-07 BD-4 < 5.92E-07 < 6.07E-07 < 6.OOE-07 < 6.06E-07 BD-5 < 5.87E-07 < 5.90E-07 < 5.73E-07 < 5.87E-07 SC-1 < 5.88E-07 < 5.90E-07 < 5.73E-07 < 5.80E-07 SD-1 < 5.79E-07 < 5.90E-07 < 5.71E-07 < 6.67E-07 SD-2 < 5.54E-07 < 5.94E-07 < 6.OOE-07 < 5.98E-07 SD-3 < 5.86E-07 < 5.91 E-07 < 6.OOE-07 < 5.94E-07 SD-4 < 5.55E-07 < 5.90E-07 < 5.89E-07 < 5.94E-07 SW-1 1.55E-06 2.02E-06 1.32E-06 1.28E-06 1.54E-06 1.66E-06 1.47E-06 9.85E-07 1.32E-07 SW-2 < 5.82E-07 < 5.85E-07 < 5.73E-07 < 6.69E-07 SW-3 6.10E-07 < 5.89E-07 < 5.71E-07 < 6.66E-07 BU-1 < 6.70E-07 < 5.83E-07 < 5.75E-07 < 6.01E-07 < 5.84E-07 SU-1 < 5.57E-07 < 5.86E-07 < 5.75E-07 < 5.98E-07 < 5.97E-07

TABLE 2A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2006 LIQUID EFFLUENTS-SUMMATION OF ALL RELEASES rnjit~at Quarter2 Quarter3 Quate Est. Total A. Fission and activation products

1. Total releases ci 1.43E-03 6.36E-04 5.47E-03 1.29E-02 6.00E+00
2. Average diluted concentration uCi/ml 3.33E-12 1.40E-12 1.18E-11 3.96E-11 during period
3. Percent of applicable limit  % 2.94E-03 2.06E-03 2.97E-02 4.57E-02 B. Tritium
1. Total release Ci 1.09E+02 7.28E+01 1.14E+03 1.56E+02 .O+00
2. Average diluted concentration uCi/ml 2.53E-07 1.61E-07 2.45E-06 4.79E-07 during period
3. Percent of applicable limit  % 1.83E-03 1.32E-03 1.33E-02 3.68E-02 C. Dissolved and entrained gases
1. Total release ci ND ND ND ND 1.90E+01
2. Average diluted concentration uci/ml N/A N/A N/A N/A during period
3. Percent of applicable limit  % N/A N/A N/A N/A D. Gross alpha radioactivity
1. Total release ci ND ND ND NDcl111

TABLE 2B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2006 LIQUID EFFLUENTS BATCH MODE Nuclides Released Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 strontium-89 Ci ND ND ND ND strontium-90 Ci ND ND ND ND cesium-134 Ci 3.24E-06 ND 1.28E-06 ND cesium-137 Ci 1.41 E-05 1.52E-05 1.33E-04 7.87E-06 iodine-131 Ci ND ND ND ND iodine-133 Ci ND ND ND ND cobalt-57 Ci 1.34E-05 ND 4.97E-06 ND cobalt-58 Ci 1.OOE-03 1.10E-04 4.40E-04 2.61 E-03 cobalt-60 Ci 1.24E-04 1.11 E-04 1.85E-03 7.03E-04 chromium-51 Ci ND ND ND 1.35E-04 iron-55 Ci 2.35E-04 3.21 E-04 2.64E-03 8.OOE-03 iron-59 Ci ND ND ND 4.52E-05 zinc-65 Ci ND ND ND ND manganese-54 Ci 2.OOE-06 ND 6.48E-05 4.74E-05 zirconium-niobium-95 Ci ND ND ND ND molybdenum-99 Ci ND ND ND ND technetium-99m Ci ND ND 2.07E-06 ND silver-11Orn Ci ND ND ND ND barium-lanthanum-140 Ci ND ND ND ND cerium-141 Ci ND ND ND ND antimony-124 Ci ND ND ND ND antimony-125 Ci 3.58E-05 7.81 E-05 3.28E-04 4.63E-04 antimony-126 Ci ND ND ND ND niobium-97 Ci ND ND ND ND tin-117m Ci ND ND ND ND sodium-24 Ci ND ND ND ND Tellurium-129m Ci ND ND ND ND Tellurium-132 Ci ND ND ND ND unidentified Ci ND ND ND ND Total for period(above) Ci 1.43E-03 6.35E-04 5.46E-03 1.20E-02 xenon-133 Cii ND ND ND I ND xenon-135 Ci ND ND ND ND

TABLE 2B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2006 LIQUID EFFLUENTS CONTINUOUS MODE Nuclides Released Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 strontium-89 Ci ND ND ND ND strontium-90 Ci ND ND ND ND cesium-134 Ci ND ND ND ND cesium-137 Ci ND ND ND ND iodine-131 Ci ND ND ND ND iodine-133 Ci ND ND ND ND cobalt-58 Ci ND ND ND 8.92E-04 cobalt-60 Ci ND ND ND 2.85E-06 iron-55 Ci ND ND ND ND iron-59 Ci ND ND ND ND zinc-65 Ci ND ND ND ND manganese-54 Ci ND ND ND ND chromium-51 Ci ND ND ND ND zirconium-niobium-95 Ci ND ND ND ND molybdenum-99 Ci ND ND ND ND technetium-99m Ci ND ND ND ND barium-lanthanum-140 Ci ND ND ND ND cerium-141 Ci ND ND ND ND unidentified Ci ND ND ND ND Total for period(above) ICI O.OOE+00 [ O.OOE+00 ] O.OOE+00 I 8.95E-04 xenon-131m Ci N_

D ND ND ND xenon-1 33m Ci ND ND ND ND xenon-1 33 Ci ND NND ND ND xenon-1 35 Ci ND ND ND ND

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2006 SOLID WASTE AND IRRADIATED FUEL SHIPMENTS A. SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL (Not irradiated fuel) 1 year Est. Total

1. Type of waste Unit PeriodPeriodError, Errotal
a. Spent, resins, filter sludges, evaporator m.i 1.28E+01 Bottoms, etc. Ci 2.23E+02
b. Dry compressible waste, contaminated m5 6.27E+00 2.50E+01 Equip, etc. Ci 3.07E+00
c. Irradiated components, control MNIA N/A Rods, etc. Ci
d. Other (describe): Cartridge Filters In 5.32E-01 2.50E+O Ci 5.10E-01
2. Estimate of major nuclide composition (by type of waste)
a. Ni-63 5.87E+01 Fe-55  % 1.60E+01 Co-58  % 1.22E+01 Co-60  % 6.84E+00 Cs-137  % 2.47E+00 Mn-54  % 1.48E+00 Sb-125  % 7.10E-01 Co-57  % 5.35E-01 Cs-134  % 5.19E-01 H-3  % 4.74E-01 Ag-r110m  % 5.02E-03
b. Fe-55  % 5.49E+01 Ni-63  % 2.94E+O1 Co-60  % 1.14E+01 Co-58  % 1.18E+00 Cs-137  % 1.15E+00 Mn-54  % 9.96E-01 Sb-125  % 6.70E-01 Co-57  % 1.02E-01 Cs-134  % 8.43E-02 H-3  % 6.03E-02 Zr-95  % 3.82E-02 Sn- 113  % 1.32E-02 Nb-95  % 1.21E-02 C. N/A 1%I N/A
d. Fe-55 6.35E+01 Ni-63  % 1.85E+01 Co-60  % 1.19E+O1 H-3  % 4.69E+00 Sb-125  % 5.82E-01 Mn-54  % 4.14E-01 C-14  % 3.03E-01 Cs-137  % 4.77E-02 Ag-110m  % ... 3.30E-02 Co-57  % 2.51E-02
3. Solid Waste Disposition Number of Waste Container Solidification Mode of Type Destination Shipments Class Agent Transportation 4 A General Design N/A Truck Duratek, Oak Ridge, TN 1 A Type A N/A Truck Duratek, Oak Ridge, TN 2 B Type A N/A Truck Studsvik, Erwin, TN 1 A General Design N/A Truck Studsvik, Erwin, TN 3 A General Design N/A Truck Duratek, Kingston, TN B. IRRADIATED FUEL SHIPMENTS (Disposition)

Number of Shipments Mode of Transportation Destination N/A N/A N/A C. REVIEW AND APPROVAL Prepared By: &Meg Date: A 7 Reviewed By: Date: _______-1 _- _

Approved By: Date: O -12/- 00o 7

LIST OF APPENDICES Appendix Title A Offsite Dose Calculation Manual B Process Control Program C Liquid Holdup Tanks D Radwaste Treatment Systems E Unplanned Releases

Appendix A Offsite Dose Calculation Manual Requirement: Technical Specification 6.13.2c requires that licensee initiated changes to the Offsite Dose Calculation Manual be submitted to the Commission in the Annual Radioactive Effluent Release Report for the period in which the change(s) was made effective. Include in this changes to the Radiological Environmental Program in accordance with Offsite Dose Calculation Manual (ODCM)-C.9. 1.1 and -C.9.2. 1.

Response: The ODCM was changed in 2006.

The Change incorporated the following items:

1. Added an Interdiscipline review prior to SORC review to ensure change information is incorporated as necessary by the impacted department.
2. Changed Table A.5.2-2 sample line temperature calibration frequency based on equipment reliability.
3. Added flexibility in gathering vegetation to Table A.9. 1-1.
4. Added flexibility in monitoring equipment placement in Table B.4-1.

Appendix B Process Control Program Requirement: Technical Specification 6.12.2a requires that licensee initiated changes to the Process Control Program be submitted to the Commission in the Annual Radioactive Effluent Release Report for the period in which the change(s) was made.

Response: No changes were made to the process control program in 2006.

Appendix C Liquid Holdup Tanks Requirement: Technical Specification 3.11.1.4 limits the quantity of radioactive material contained in any outside temporary tank. With the quantity of radioactive material in any outside temporary tank exceeding the limits of Technical Specification 3.11.1.4, a description of the events leading to this condition is required in the next Annual Effluent Release Report in accordance with Tech. Spec. 6.8.1.4.

Response: From January 1, 2006 to December 31, 2006, there was no radioactive material stored in any temporary outdoor tank that exceeded the limits of T. S. 3.11.1.4.

Appendix D Radwaste Treatment Systems Requirement: Technical Specification 6.14.1 a requires that licensee initiated changes to the Radwaste Treatment Systems (liquid, gaseous, and solid) be submitted to the Commission in the Annual Radioactive Effluent Release Report for the period in which the change was made.

Response: For 2006, FPL Energy Seabrook LLC, will submit any changes to the Radwaste Treatment Systems (liquid, gaseous and solid) as part of the FSAR update.

Appendix E Unplanned Releases Requirement: Technical Specification 6.8.1.4 requires a list and description of unplanned releases from the site to UNRESTRICTED AREAS of radioactive materials in gaseous and liquid effluents made during the reporting period.

Submit all groundwater monitoring well sample results and a description of any significant onsite leaks/spills that impact groundwater Response: On June 6, 2006, an unexpected loss of the Volume Control Tank (VCT) level occurred during the hanging of a clearance order to isolate the letdown reheat heat exchanger CS-E-8 for maintenance.

An error was made in the preparation and review of a clearance affecting letdown reheat heat exchanger CS-E-8. On June 6, 2006, when this clearance was in the process of being hung, it caused an unexpected loss of approximately 180 gallons of water from the VCT. Upon noting the unexpected decrease in VCT level, the Unit Supervisor directed actions, which terminated the VCT level decrease.

The Wide Range Gas Monitor (WRGM) radiation monitor showed an increase in radioactive concentration during the coolant leak. Gases were released to the Primary Auxiliary Building (PAB) heat exchanger and sump rooms and made their way to the plant stack through the normal ventilation pathway as indicated by the WRGM.

The releases from the plant vent were minimal. The release dose values were approximately a factor of 1000 below the monthly Technical Specification limits.

Groundwater monitoring well Tritium information Well ID. Mar-06 May-06 Jun-06 Jul-06 Aug-06 Sep-06 Oct-06 Nov-06 Dec-06 (uCi/ml) (uCi/ml) (uCi/ml) (uCi/mi) (uCi/ml) (uCi/ml) (uCi/ml) (uCi/ml) (uCi/ml)

BD-1 < 5.92E-07 < 5.98E-07 < 5.73E-07 < 5.80E-07 BD-2 < 5.77E-07 < 5.89E-07 < 5.70E-07 < 6.66E-07 BD-3 < 5.62E-07 < 6.07E-07 < 6.04E-07 < 5.98E-07 BD-4 < 5.92E-07 < 6.07E-07 < 6.OOE-07 < 6.06E-07 BD-5 < 5.87E-07 < 5.90E-07 < 5.73E-07 < 5.87E-07 SC-1 < 5.88E-07 < 5.90E-07 < 5.73E-07 < 5.80E-07 SD-1 < 5.79E-07 < 5.90E-07 < 5.71E-07 < 6.67E-07 SD-2 < 5.54E-07 < 5.94E-07 < 6.OOE-07 < 5.98E-07 SD-3 < 5.86E-07 < 5.91E-07 < 6.OOE-07 < 5.94E-07 SD-4 < 5.55E-07 < 5.90E-07 < 5.89E-07 < 5.94E-07 SW-1 1.55E-06 2.02E-06 1.32E-06 1.28E-06 1.54E-06 1.66E-06 1.47E-06 9.85E-07 1.32E-07 SW-2 < 5.82E-07 < 5.85E-07 < 5.73E-07 < 6.69E-07 SW-3 6.10E-07 < 5.89E-07 < 5.71E-07 < 6.66E-07 BU-1 < 6.70E-07 < 5.83E-07 < 5.75E-07 < 6.01E-07 < 5.84E-07 SU-1 < 5.57E-07 < 5.86E-07 < 5.75E-07 < 5.98E-07 < 5.97E-07

ENCLOSURE 2 TO SBK-L-07074 Joint Frequency Distributions of Wind Speed, Wind Direction and Atmospheric Stability

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS A CLASS FREQUENCY (PERCENT) = .56 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 C-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 4-7 0 0 0 0 0 0 0 0 0 0 0 0 0 3 1 0 0 4 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 6.38 2.13 .00 .00 8.51 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .04 .01 .00 .00 .05 8-12 0 0 0 0 1 2 12 6 0 0 3 1 2 2 1 0 0 30 (1) .00 .00 .00 .00 2.13 4.26 25.53 12.77 .00 .00 6.38 2.13 4.26 4.26 2.13 .00 .00 63.83 (2) .00 .00 .00 .00 .01 .02 .14 .07 .00 .00 .04 .01 .02 .02 .01 .00 .00 .36 13-18 0 0 0 3 0 1 3 2 0 0 2 0 0 0 2 0 0 13 (1) .00 .00 .00 6.38 .00 2 .13 6.38 4 .26 .00 .00 4.26 .00 .00 .00 4 .26 .00 .00 27.66 (2) .00 .00 .00 .04 .00 .01 .04 .02 .00 .00 .02 .00 .00 .00 .02 .00 .00 .15 19-24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 '0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 ALL SPEEDS 0 0 0 3 1 3 15 8 0 0 5 1 2 5 4 0 0 47 (1) .00 .00 .00 6.38 2.13 6.38 31.91 17.02 .00 .00 10.64 2.13 4.26 10.64 8.51 .00 .00 100.00 (2) .00 .00 .00 .04 .01 .04 .18 .09 .00 .00 .06 .01 .02 .06 .05 .00 .00 .56 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS B CLASS FREQUENCY (PERCENT) = 1.31 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 C-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 4-7 0 0 0 2 0 0 2 0 1 0 1 1 0 1 0 0 0 8 (1) .00 .00 .00 1.82 .00 .00 1.82 .00 .91 .00 .91 .91 .00 .91" .00 .00 .00 7.27 (2) .00 .00 .00 .02 .00 .00 .02 .00 .01 .00 .01 .01 .00 .01 .00 .00 .00 .09 8-12 2 0 0 2 2 4 7 0 2 3 9 13 7 6 6 0 0 63 (1) 1.82 .00 .00 1.82 1.82 3.64 6.36 .00 1.82 2.73 8.18 11.82 6.36 5.45 5.45 .00 .00 57.27 (2) .02 .00 .00 .02 .02 .05 .08 .00 .02 .04 .11 .15 .08 .07 .07 .00 .00 .75 13-18 1 0 2 3 0 0 1 1 0 0 5 1 1 15 6 0 0 36 (1) .91 .00 1.82 2.73 .00 .00 .91 .91 .00 .00 4.55 .91 .91 13.64 5.45 .00 .00 32.73 (2) .01 .00 .02 .04 .00 .00 .01 .01 .00 .00 .06 .01 .01 .18 .07 .00 .00 .43 19-24 0 0 1 0 0 0 0 0 0 0 0 0 0 2 0 0 0 3 (1) .00 .00 .91 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 1.82 .00 .00 .00 2.73 (2) .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 .00 .00 .00 .04 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 ALL SPEEDS 3 0 3 7 2 4 10 1 3 3 15 15 8 24 12 0 0 110 (1) 2.73 .00 2.73 6.36 1.82 3.64 9.09 .91 2.73 2.73 13.64 13.64 7.27 21.82 10.91 .00 .00 100.00 (2) .04 .00 .04 .08 .02 .05 .12 .01 .04 .04 .18 .18 .09 .28 .14 .00 .00 1.31 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS C CLASS FREQUENCY (PERCENT) = 4.58 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 C-3 0 1 0 0 1 1 0 0 0 0 1 0 1 0 0 0 0 5 (1) .00 .26 .00 .00 .26 .26 .00 .00 .00 .00 .26 .00 .26 .00 .00 .00 .00 1.30 (2) .00 .01 .00 .00 .01 .01 .00 .00 .00 .00 .01 .00 .01 .00 .00 .00 .00 .06 4-7 1 1 0 2 1 1 6 0 0 4 5 9 12 5 1 2 0 50 (1) .26 .26 .00 .52 .26 .26 1.55 .00 .00 1.04 1.30 2.33 3.11 1.30 .26 .52 .00 12.95 (2) .01 .01 .00 .02 .01 .01 .07 .00 .00 .05 .06 .11 .14 .06 .01 .02 .00 .59 8-12 6 0 2 9 23 13 14 5 4 16 23 28 19 31 16 1 0 210 (1) 1.55 .00 .52 2.33 5.96 3.37 3.63 1.30 1.04 4.15 5.96 7.25 4.92 8.03 4.15 .26 .00 54.40 (2) .07 .00 .02 .11 .27 .15 .17 .06 .05 .19 .27 .33 .23 .37 .19 .01 .00 2.49 13-18 2 0 8 11 2 0 2 1 0 5 12 5 6 41 is 2 0 115 (1) .52 .00 2.07 2.85 .52 .00 .52 .26 .00 1.30 3.11 1.30 1.55 10.62 4.66 .52 .00 29.79 (2) .02 .00 .09 .13 .02 .00 .02 .01 .00 .06 .14 .06 .07 .49 .21 .02 .00 1.37 19-24 0 0 0 0 0 0 0 0 0 0 0 1 0 4 1 0 0 6 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .26 .00 1.04 .26 .00 .00 1.55 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .05 .01 .00 .00 .07 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 ALL SPEEDS 9 2 10 22 27 15 22 6 4 25 41 43 38 81 36 5 0 386 (1) 2.33 .52 2.59 5.70 6.99 3.89 5.70 1.55 1.04 6.48 10.62 11.14 9.84 20.98 9.33 1.30 .00 100.00 (2) .11 .02 .12 .26 .32 .18 .26 .07 .05 .30 .49 S. .45 .96 .43 .06 .00 4.58 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS D CLASS FREQUENCY (PERCENT) = 48.04 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 (1) .00 .00 .00 .00 .00 .00 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 (2) .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 C-3 6 6 8 14 7 4 8 12 10 9 11 16 27 21 25 15 0 199 (1) .15 .15 .20 .35 .17 .10 .20 .30 .25 .22 .27 .40 .67 .52 .62 .37 .00 4.92 (2) .07 .07 .09 .17 .08 .05 .09 .14 .12 .11 .13 .19 .32 .25 .30 .18 .00 2.36 4-7 80 50 50 65 109 50 87 67 50 89 124 128 131 162 149 92 0 1483 (1) 1.98 1.24 1.24 1.61 2.69 1.24 2.15 1.66 1.24 2.20 3.06 3.16 3.24 4.00 3.68 2.27 .00 36.65 (2) .95 .59 .59 .77 1.29 .59 1.03 .80 .59 1.06 1.47 1.52 1.56 1.92 1.77 1.09 .00 17.61 8-12 46 42 146 86 109 61 68 40 26 89 207 144 147 246 187 52 0 1696 (1) 1.14 1.04 3.61 2.13 2.69 1.51 1.68 .99 .64 2.20 5.12 3.56 3.63 6.08 4.62 1.29 .00 41.92 (2) .55 .50 1.73 1.02 1.29 .72 .81 .47 .31 1.06 2.46 1.71 1.75 2.92 2.22 .62 .00 20.14 13-18 6 2 94 30 22 2 5 0 1 12 62 22 38 174 110 10 0 590 (1) .15 .05 2.32 .74 .54 .05 .12 .00 .02 .30 1.53 .54 .94 4.30 2.72 .25 .00 14.58 (2) .07 .02 1.12 .36 .26 .02 .06 .00 .01 .14 .74 .26 .45 2.07 1.31 .12 .00 7.01 19-24 0 0 26 1 3 0 1 0 0 1 2 4 6 10 13 0 0 72 (1) .00 .00 .64 .02 .07 .00 .02 .00 .00 .02 .05 .10 .15 .37 .32 .00 .00 1.78 (2) .00 .00 .31 .01 .04 .00 .01 .00 .00 .01 .02 .05 .07 .18 .15 .00 .00 .85 GT 24 0 0 4 0 0 0 0 0 0 0 0 0 1 0 0 0 0 5 (1) .00 .00 .10 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 .00 .00 .00 .00 .12 (2) .00 .00 .05 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .06 ALL SPEEDS 138 100 328 196 250 117 170 119 87 200 406 314 350 618 484 169 0 4046 (1) 3.41 2.47 8.11 4.84 6.18 2.89 4.20 2.94 2.15 4.94 10.03 7.76 8.65 15.27 11.96 4.18 .00 100.00 (2) 1.64 1.19 3.89 2.33 2.97 1.39 2.02 1.41 1.03 2.37 4.82 3.73 4.16 7.34 5.75 2.01 .00 48.04 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JANO6-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS E CLASS FREQUENCY (PERCENT) = 31.39 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 2 (1) .04 .00 .00 .04 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .08 (2) .01 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 C-3 22 18 16 37 20 9 17 31 34 24 33 51 70 71 36 27 0 516 (1) .83 .68 .61 1.40 .76 .34 .64 1.17 1.29 .91 1.25 1.93 2.65 2.69 1.36 1.02 .00 19.52 (2) .26 .21 .19 .44 .24 .11 .20 .37 .40 .28 .39 .61 .83 .84 .43 .32 .00 6.13 4-7 34 23 32 37 54 42 48 59 66 104 147 239 266 176 119 70 0 1516 (1) 1.29 .87 1.21 1.40 2.04 1.59 1.82 2.23 2.50 3.93 5.56 9.04 10.06 6.66 4.50 2.65 .00 57.34 (2) .40 .27 .38 .44 .64 .50 .57 .70 .78 1.23 1.75 2.84 3.16 2.09 1.41 .83 .00 18.00 8-12 2 4 46 25 30 10 25 15 8 25 71 94 45 71 26 7 0 504 (1) .08 .15 1.74 .95 1.13 .38 .95 .57 .30 .95 2.69 3.56 1.70 2.69 .98 .26 .00 19.06 (2) .02 .05 .55 .30 .36 .12 .30 .18 .09 .30 .84 1.12 .53 .84 .31 .08 .00 5.98 13-18 0 3 41 3 12 2 3 9 2 0 3 7 2 1 3 0 0 91 (1) .00 .11 1.55 .11 .45 .08 .11 .34 .08 .00 .11 .26 .08 .04 .11 .00 .00 3.44 (2) .00 .04 .49 .04 .14 .02 .04 .1i .02 .00 .04 .08 .02 .01 .04 .00 .00 1.08 19-24 0 0 9 0 1 0 2 2 0 0 0 0 0 0 0 0 0 14 (1) .00 .00 .34 .00 .04 .00 .08 .08 .00 .00 .00 .00 .00 .00 .00 .00 .00 .53 (2) .00 .00 .11 .00 .01 .00 .02 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 .17 GT 24 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 (1) .00 .00 .04 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .04 (2) .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 ALL SPEEDS 59 48 145 103 117 63 95 116 110 153 254 391 383 319 184 104 0 2644 (1) 2.23 1.82 5.48 3.90 4.43 2.38 3.59 4.39 4.16 5.79 9.61 14.79 14.49 12.07 6.96 3.93 .00 100.00 (2) .70 .57 1.72 1.22 1.39 .75 1.13 1.38 1.31 1.82 3.02 4.64 4.55 3.79 2.18 1.23 .00 31.39 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS F CLASS FREQUENCY (PERCENT) = 7.99 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 1 0 1 1 0 0 0 0 0 0 1 1 0 0 0 2 0 7 (1) .15 .00 .15 .15 .00 .00 .00 .00 .00 .00 .15 .15 .00 .00 .00 .30 .00 1.04 (2) .01 .00 .01 .01 .00 .00 .00 .00 .00 .00 .01 .01 .00 .00 .00 .02 .00 .08 C-3 10 10 4 16 13 3 5 2 10 12 36 54 83 59 27 17 0 361 (1) 1.49 1.49 .59 2.38 1.93 .45 .74 .30 1.49 1.78 5.35 8.02 12.33 8.77 4.01 2.53 .00 53.64 (2) .12 .12 .05 .19 .15 .04 .06 .02 .12 .14 .43 .64 .99 .70 .32 .20 .00 4.29 4-7 1 3 3 4 9 3 5 1 5 9 20 60 64 55 50 6 0 298 (1) .15 .45 .45 .59 1.34 .45 .74 .15 .74 1.34 2.97 8.92 9.51 8.17 7.43 .89 .00 44.28 (2) .01 .04 .04 .05 .11 .04 .06 .01 .06 .11 .24 .71 .76 .65 .59 .07 .00 3.54 8-12 0 0 1 0 0 0 2 0 0 0 0 0 0 0 2 2 0 7 (1) .00 .00 .15 .00 .00 .00 .30 .00 .00 .00 .00 .00 .00 .00 .30 .30 .00 1.04 (2) .00 .00 .01 .00 .00 .00 .02 .00 .00 .00 .00 .00 .00 .00 .02 .02 .00 .08 13-18 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 19-24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 ALL SPEEDS 12 13 9 21 22 6 12 3 15 21 57 115 147 114 79 27 0 673 (1) 1.78 1.93 1.34 3.12 3.27 .89 1.78 .45 2.23 3.12 8.47 17.09 21.84 16.94 11.74 4.01 .00 100.00 (2) .14 .15 .11 .25 .26 .07 .14 .04 .18 .25 .68 1.37 1.75 1.35 .94 .32 .00 7.99 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS G CLASS FREQUENCY (PERCENT) = 6.13 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 3 (1) .00 .19 .00 .00 .00 .19 .00 .00 .00 .00 .00 .19 .00 .00 .00 .00 .00 .58 (2) .00 .01 .00 .00 .00 .01 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .04 C-3 6 4 5 9 6 4 1 0 3 6 25 72 114 102 49 12 0 417 (1) 1.16 .78 .97 1.74 1.16 .78 .19 .00 .58 1.16 4.84 13.76 22.09 19.77 9.50 2.33 .00 80.81 (2) .07 .05 .06 .11 .07 .05 .01 .00 .04 .07 .30 .84 1.35 1.21 .58 .14 .00 4.95 4-7 2 0 0 0 3 0 0 0 0 1 4 9 12 34 27 3 0 95 (1) .39 .00 .00 .00 .58 .00 .00 .00 .00 .19 .78 1.74 2.33 6.59 5.23 .58 .00 18.41 (2) .02 .00 .00 .00 .04 .00 .00 .00 .00 .01 .05 .11 .14 .40 .32 .04 .00 1.13 8-12 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 13-18 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 19-24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .19 .00 .19 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .01 ALL SPEEDS 8 5 5 9 9 5 1 0 3 7 29 81 126 136 76 16 0 516 (1) 1.55 .97 .97 1.74 1.74 .97 .19 .00 .58 1.36 5.62 15.70 24.42 26.36 14.73 3.10 .00 100.00 (2) .09 .06 .06 .11 .11 .06 .01 .00 .04 .08 .34 .96 1.50 1.61 .90 .19 .00 6.13 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS ALL CLASS FREQUENCY (PERCENT) 100.00 1

WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 2 1 1 2 0 1 1 0 0 0 1 2 0 0 0 2 0 13 (1) .02 .01 .01 .02 .00 .01 .01 .00 .00 .00 .01 .02 .00 .00 .00 .02 .00 .15 (2) .02 .01 .01 .02 .00 .01 .01 .00 .00 .00 .01 .02 .00 .00 .00 .02 .00 .15 C-3 44 39 33 76 47 21 31 45 57 51 106 192 295 253 137 71 0 1498 (1) .52 .46 .39 .90 .56 .25 .37 .53 .68 .61 1.26 2.28 3.50 3.00 1 .63 .84 .00 17.79 (2) .52 .46 .39 .90 .56 .25 .37 .53 .68 .61 1.26 2.28 3.50 3.00 1.63 .84 .00 17.79 4-7 118 77 85 110 176 96 148 127 122 207 301 446 485 436 347 173 0 3454 (1) 1.40 .91 1.01 1.31 2.09 1.14 1.76 1.51 1.45 2.46 3.57 5.30 5.76 5.18 4.12 2.05 .00 41.01 (2) 1.40 .91 1.01 1.31 2.09 1.14 1.76 1.51 1.45 2.46 3.57 5.30 5.76 5.18 4.12 2.05 .00 41.01 8-12 56 46 195 122 165 90 128 66 40 133 313 280 220 356 238 62 0 2510 (1) .66 .55 2.32 1.45 1.96 1.07 1.52 .78 .47 1.58 3.72 3.32 2.61 4.23 2.83 .74 .00 29.80 (2) .66 .55 2.32 1.45 1.96 1.07 1.52 .78 .47 1.58 3.72 3.32 2.61 4.23 2.83 .74 .00 29.80 13-18 9 5 145 50 36 5 14 13 3 17 84 35 47 231 139 12 0 845 (1) .11 .06 1.72 .59 .43 .06 .17 .15 .04 .20 1.00 .42 .56 2.74 1.65 .14 .00 10.03 (2) .11 .06 1.72 .59 .43 .06 .17 .15 .04 .20 1.00 .42 .56 2.74 1.65 .14 .00 10.03 19-24 0 0 36 2 4 0 3 2 0 1 2 5 6 21 14 0 0 95 (1) .00 .00 .43 .01 .05 .00 .04 .02 .00 .01 .02 .06 .07 .25 .17 .00 .00 1.13 (2) .00 .00 .43 .01 .05 .00 .04 .02 .00 .01 .02 .06 .07 .25 .17 .00 .00 1.13 GT 24 0 0 5 0 0 0 0 0 0 0 0 0 1 0 0 1 0 7 (1) .00 .00 .06 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .01 .00 .08 (2) .00 .00 " .06 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .01 .00 .08 ALL SPEEDS 229 168 500 361 428 213 325 253 222 409 807 960 1054 1297 875 321 0 8422 (1) 2.72 1.99 5.94 4.29 5.08 2.53 3.86 3.00 2.64 4.86 9.58 11.40 12.51 15.40 10.39 3.81 .00 200.00 (2) 2.72 1.99 5.94 4.29 5.08 2.53 3.86 3.00 2.64 4.86 9.58 11.40 12,51 15.40 10.39 3.81 .00 100.00 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS A CLASS FREQUENCY (PERCENT) .55 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 C-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 4-7 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0 3 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 2.13 4.26 .00 .00 6.38 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .02 .00 .00 .04 8-12 0 0 0 0 1 0 7 1 0 0 1 0 0 0 2 0 0 12 (1) .00 .00 .00 .00 2.13 .00 14.89 2.13 .00 .00 2.13 .00 .00 .00 4.26 .00 .00 25.53 (2) .00 .00 .00 .00 .01 .00 .08 .01 .00 .00 .01 .00 .00 .00 .02 .00 .00 .14 13-18 0 0 0 2 0 1 9 5 0 0 3 0 3 2 0 0 0 25 (1) .00 .00 .00 4.26 .00 2.13 19.15 10.64 .00 .00 6.38 .00 6.38 4.26 .00 .00 .00 53.19 (2) .00 .00 .00 .02 .00 .01 .11 .06 .00 .00 .04 .00 .04 .02 .00 .00 .00 .30 19-24 0 0 0 1 0 0 1 2 0 0 1 0 0 1 1 0 0 7 (1) .00 .00 .00 2.13 .00 .00 2.13 4.26 .00 .00 2.13 .00 .00 2.13 2.13 .00 .00 14.89 (2) .00 .00 .00 .01 .00 .00 .01 .02 .00 .00 .01 .00 .00 .01 .01 .00 .00 .08 CT 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 ALL SPEEDS 0 0 0 3 1 1 17 8 0 0 5 0 3 4 5 0 0 47 (1) .00 .00 .00 6.38 2.13 2.13 36.17 17.02 .00 .00 10.64 .00 6.38 8.51 10.64 .00 .00 100.00 (2) .00 .00 .00 .04 .01 .01 .20 .09 .00 .00 .06 .00 .04 .05 .06 .00 .00 .55 (1) =PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS B CLASS FREQUENCY (PERCENT) = 1.30 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 C-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 4-7 0 0 0 1 0 0 0 0 0 0 1 0 0 0 1 0 0 3 (1) .00 .00 .00 .91 .00 .00 .00 .00 .00 .00 .91 .00 .00 .00 .91 .00 .00 2.73 (2) .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .01 .00 .00 .04 8-12 0 0 0 0 3 0 8 1 1 2 2 6 4 2 1 1 0 31 (1) .00 .00 .00 .00 2.73 .00 7.27 .91 .91 1.82 1.82 5.45 3.64 1.82 .91 .91 .00 28.18 (2) .00 .00 .00 .00 .04 .00 .09 .01 .01 .02 .02 .07 .05 .02 .01 .01 .00 .37 13-18 2 0 2 2 0 1 3 0 0 2 9 10 3 7 9 0 0 50 (1) 1.82 .00 1.82 1.82 .00- .91 2.73 .00 .00 1.82 8.18 9.09 2.73 6.38 8.18 .00 .00 45.45 (2) .02 .00 .02 .02 .00 .01 .04 .00 .00 .02 .11 .12 .04 .08 .11 .00 .00 .59 19-24 1 1 1 1 0 0 0 1 0 0 1 0 0 12 4 0 0 22 (1) .91 .91 .91 .91 .00 .00 .00 .91 .00 .00 .91 .00 .00 10.91 3.64 .00 .00 20.00 (2) .01 .01 .01 .01 .00 .00 .00 .01 .00 .00 .01 .00 .00 .14 .05 .00 .00 .26 GT 24 0 0 1 0 0 0 0 0 0 0 0 0 0 3 0 0 0 4 (1) .00 .00 .91 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 2.73 .00 .00 .00 3.64 (2) .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .04 .00 .00 .00 .05 ALL SPEEDS 3 1 4 4 3 1 11 2 1 4 13 16 7 24 15 1 0 110 (1) 2.73 .91 3.64 3.64 2,73 .91 10.00 1.82 .91 3.64 21.82 14.55 6.36 21.82 13.64 .91 .00 100.00 (2) .04 .01 .05 .05 .04 .01 .13 .02 .01 .05 .15 .19 .08 .28 .18 .01 .00 1.30

)1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS C CLASS FREQUENCY (PERCENT) = 4.60 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 C-3 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 2 (1) .00 .00 .00 .26 .26 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .51 (2) .00 .00 .00 .01 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 4-7 1 2 1 1 0 0 0 0 0 2 2 5 6 4 1 1 0 26 (1) .26 .51 .26 .26 .00 .00 .00 .00 .00 .51 .51 1.28 1.54 1.03 .26 .26 .00 6.67 (2) .01 .02 .01 .01 .00 .00 .00 .00 .00 .02 .02 .06 .07 .05 .01 .01 .00 .31 8-12 3 0 3 6 14 4 20 5 2 9 12 17 18 11 7 0 0 131 (1) .77 .00 .77 1.54 3.59 1.03 5.13 1.28 .51 2.31 3.08 4.36 4.62 2.82 1.79 .00 .00 33.59 (2) .04 .00 .04 .07 .17 .05 .24 .06 .02 .11 .14 .20 .21 .13 .08 .00 .00 1.55 13-18 4 0 13 8 7 3 4 5 2 10 17 16 10 35 16 1 0 151 (1) 1.03 .00 3.33 2.05 1.79 .77 1.03 1.28 .51 2.56 4.36 4.10 2.56 8.97 4.10 .26 .00 38.72 (2) .05 .00 .15 .09 .08 .04 .05 .06 .02 .12 .20 .19 .12 .41 .19 .01 .00 1.78 19-24 2 1 0 2 0 0 1 1 0 1 7 2 6 23 20 1 0 67 (1) .51 .26 .00 .51 .00 .00 .26 .26 .00 .26 1.79 .51 1.54 5.90 5.13 .26 .00 17.18 (2) .02 .01 .00 .02 .00 .00 .01 .01 .00 .01 .08 .02 .07 .27 .24 .02 .00 .79 GT 24 0 0 0 1 0 0 0 0 0 0 0 1 0 9 2 0 0 13 (1) .00 .00 .00 .26 .00 .00 .00 .00 .00 .00 .00 .26 .00 2.31 .51 .00 .00 3.33 (2) .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .01 .00 .11 .02 .00 .00 .15 ALL SPEEDS 10 3 17 19 22 7 25 11 4 22 38 41 40 82 46 3 0 390 (1) 2.56 .77 4.36 4.87 5.64 1.79 6.41 2.82 1.03 5.64 9.74 10.51 10.26 21.03 11.79 .77 .00 100.00 (2) .12 .04 .20 .22 .26 .08 .30 .13 .05 .26 .45 .48 .47 .97 .54 .04 .00 4.60 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS D CLASS FREQUENCY (PERCENT) = 48.01 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 2 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .05 .00 .00 .00 .00 .00 .05 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 .00 .00 .00 .00 .00 .02 C-3 4 4 3 5 3 2 3 2 4 5 8 5 4 7 8 6 0 73 (1) .10 .10 .07 .12 .07 .05 .07 .05 .10 .12 .20 .12 .10 .17 .20 .15 .00 1.79 (2) OS .05 .04 .06 .04 .02 .04 .02 .05 .06 .09 .06 .05 .08 .09 .07 .00 .86 4-7 41 13 27 35 49 49 43 37 25 29 47 50 46 61 71 45 0 668 (1) 1.01 .32 .66 .86 1.20 1.20 1.06 .91 .61 .71 1.16 1.23 1.13 1.50 1.75 1.11 .00 16.42 (2) .48 .15 .32 .41 .58 .58 .51 .44 .30 .34 .55 .59 .54 .72 .84 .53 .00 7.88 8-12 91 64 62 85 73 77 84 69 47 94 137 116 120 159 160 70 0 1508 (1) 2.24 1.57 1.52 2.09 1.79 1.89 2.06 1.70 1.16 2.31 3.37 2.85 2.95 3.91 3.93 1.72 .00 37.07 (2) 1.07 .76 .73 1.00 .86 .91 .99 .81 .55 1.11 1.62 1.37 1.42 1.88 1.89 .83 .00 17.80 13-18 48 64 1il 35 18 11 27 34 21 61 165 100 99 205 161 27 0 1187 (1) 1.18 1.57 2.73 .86 .44 .27 .66 .84 .52 1.50 4.06 2.46 2.43 5.04 3.96 .66 .00 29.18 (2) .57 .76 1.31 .41 .21 .13 .32 .40 .25 .72 1.95 1.18 1.17 2.42 1.90 .32 .00 14.01 19-24 8 19 48 17 19 2 5 5 1 6 38 14 49 139 114 10 0 494 (1) .20 .47 1.18 .42 .47 .05 .12 .12 .02 .15 .93 .34 1.20 3.42 2.80 .25 .00 12.14 (2) .09 .22 .57 .20 .22 .02 .06 .06 .01 .07 .45 .17 .58 1.64 1.35 .12 .00 5.83 GT 24 1 1 40 6 3 1 4 0 0 1 1 9 24 26 29 0 0 136 (1) .02 .02 .98 .15 .07 .02 .10 .00 .00 .02 .02 .22 .59 .64 .47 .00 .00 3.34 (2) .01 .01 .47 .07 .04 .01 .05 .00 .00 .01 .01 .11 .28 .31 .22 .00 .00 1.60 ALL SPEEDS 193 165 291 183 165 142 166 147 98 196 396 296 342 597 533 158 0 4068 (1) 4.74 4.06 7.15 4.50 4.06 3.49 4.08 3.61 2.41 4.82 9.73 7.28 8.41 14.68.13.10 3.88 .00 100.00 (2) 2.28 1.95 3.43 2.16 1.95 1.68 1.96 1.73 1.16 2.31 4.67 3.49 4.04 7.05 6.29 1.86 .00 48.01 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .9S MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS E CLASS FREQUENCY (PERCENT) = 31.34 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 (1) .00 .00 .00 .00 .00 .00 .04 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .04 (2) .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 C-3 2 6 6 3 3 9 6 3 4 8 4 2 4 7 3 3 0 73 (1) .08 .23 .23 .11 .11 .34 .23 .11 .15 .30 .15 .08 .15 .26 .11 .11 .00 2.75 (2) .02 .07, .07 .04 .04 .11 .07 .04 .05 .09 .05 .02 .05 .08 .04 .04 .00 .86 4-7 28 19 33 23 30 34 33 26 32 31 27 24 21 34 21 25 0 441 (1) 1.05 .72 1.24 .87 1.13 1.28 1.24 .98 1.20 1.17 1.02 .90 .79 1.28 .79 .94 .00 16.60 (2) .33 .22 .39 .27 .35 .40 .39 .31 .38 .37 .32 .28 .25 .40 .25 .30 .00 5.20 8-12 61 34 27 22 19 19 31 59 81 107 134 1il 117 169 114 53 0 1158 (1) 2.30 1.28 1.02 .83 .72 .72 1.17 2.22 3.05 4.03 5.05 4.18 4.41 6.36 4.29 2.00 .00 43.60 (2) .72 .40 .32 .26 .22 .22 .37 .70 .96 1.26 1.58 1.31 1.38 1.99 1.35 .63 .00 13.67 13-18 22 13 37 17 7 7 15 26 15 36 109 135 150 172 67 13 0 841 (1) .83 .49 1.39 .64 .26 .26 .56 .98 .56 1.36 4.10 5.08 5.65 6,48 2.52 .49 .00 31.66 (2) .26 .15 .44 .20 .08 .08 .18 .31 .18 .42 1.29 1.59 1.77 2.03 .79 .15 .00 9.92 19-24 0 11 22 7 7 5 3 10 1 3 4 7 8 15 3 1 0 107 (1) .00 .41 .83 .26 .26 .19 .11 .38 .04 .11 .15 .26 .30 .56 .11 .04 .00 4.03 (2) .00 .13 .26 .08 .08 .06 .04 .12 .01 .04 .05 .08 .09 .18 .04 .01 .00 1.26 GT 24 0 6 9 2 4 1 3 10 0 0 0 0 0 0 0 0 0 35 (1) .00 .23 .34 .08 .15 .04 .11 .38 .00 .00 .00 .00 .00 .00 .00 .00 .00 1.32 (2) .00 .07 .11 .02 .05 .01 .04 .12 .00 .00 .00 .00 .00 .00 .00 .00 .00 .41 ALL SPEEDS 113 89 134 74 70 75 92 134 133 185 278 279 300 397 208 95 0 2656 (1) 4.25 3.35 5.05 2.79 2.64 2.82 3.46 5.05 5.01 6.97 10.47 10.50 11.30 14.95 7.83 3.58 .00 100.00 (2) 1.33 1.05 1.58 .87 .83 .89 1.09 1.58 1.57 2.18 3.28 3.29 3.54 4.68 2.45 1.12 .00 31.34 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS F CLASS FREQUENCY (PERCENT) = 8.06 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 C-3 4 0 1 1 2 3 1 3 5 1 2 0 2 1 3 0 0 29 (1) .59 .00 .15 .15 .29 .44 .15 .44 .73 .15 .29 .00 .29 .15 .44 .00 .00 4.25 (2) .05 .00 .01 .01 .02 .04 .01 .04 .06 .01 .02 .00 .02 .01 .04 .00 .00 .34 4-7 11 4 9 5 2 5 14 10 16 14 16 15 15 9 10 2 0 157 (1) 1.61 .59 1.32 .73 .29 .73 2.05 1.46 2.34 2.05 2.34 2.20 2.20 1.32 1.46 .29 .00 22.99 (2) .13 .05 .11 .06 .02 .06 .17 .12 .19 .17 .19 .28 .18 .11 .12 .02 .00 1.85 8-12 25 4 5 7 4 2 1 13 17 27 29 55 48 55 41 24 0 357 (1) 3.66 .59 .73 1.02 .59 .29 .15 1.90 2.49 3.95 4.25 8.05 7.03 8.05 6.00 3.51 .00 52.27 (2) .30 .05 .06 .08 .05 .02 .01 .15 .20 .32 .34 .65 .57 .65 .48 .28 .00 4.21 13-18 8 1 0 1 0 0 0 4 1 8 10 26 20 26 18 17 0 140 (1) 1.17 .15 .00 .15 .00 .00 .00 .59 .15 1.17 1.46 3.81 2.93 3.81 2.64 2.49 .00 20.50 (2) .09 .01 .00 .01 .00 .00 .00 .05 .01 .09 .12 .31 .24 .31 .21 .20 .00 1.65 19-24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 ALL SPEEDS 48 9 15 14 8 10 16 30 39 50 57 96 85 91 72 43 0 683 (1) 7.03 1.32 2.20 2.05 1.17 1.46 2.34 4.39 5.71 7.32 8.35 14.06 12.45 13.32 10.54 6.30 .00 100.00 (2) .57 .11 .18 .17 .09 .12 .19 .35 .46 .59 .67 1.13 1.00 1.07 .85 .51 .00 8.06 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS G CLASS FREQUENCY (PERCENT) = 6.14 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 (1) .00 .00 .19 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .19 (2) .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 C-3 3 1 2 1 4 0 5 3 5 2 5 4 2 3 2 2 0 44 (1) .58 .19 .38 .19 .77 .00 .96 .58 .96 .38 .96 .77 .38 .58 .38 .38 .00 8.46 (2) .04 .01 .02 .01 .05 .00 .06 .04 .06 .02 .06 .05 .02 .04 .02 .02 .00 .52 4-7 5 3 5 2 0 1 2 11 14 23 27 18 23 19 5 3 0 161 (1) .96 .58 .96 .38 .00 .19 .38 2.12 2.69 4.42 5.19 3.46 4.42 3.65 .96 .58 .00 30.96 (2) .06 .04 .06 .02 .00 .01 .02 .13 .17 .27 .32 .21 .27 .22 .06 .04 .00 1.90 8-12 23 1 3 0 0 0 1 6 11 22 29 42 28 35 36 35 0 272 (1) 4.42 .19 .58 .00 .00 .00 .19 1.15 2.12 4.23 5.58 8.08 5.38 6.73 6.92 6.73 .00 52.31 (2) .27 .01 .04 .00 .00 .00 .01 .07 .13 .26 .34 .50 .33 .41 .42 .41 .00 3.21 13-18 5 2 1 0 0 0 0 0 1 0 7 5 6 5 7 2 0 41 (1) .96 .38 .19 .00 .00 .00 .00 .00 .19 .00 1.35 .96 1.15 .96 1.35 .38 .00 7.88 (2) .06 .02 .01 .00 .00 .00 .00 .00 .01 .00 .08 .06 .07 .06 .08 .02 .00 .48 19-24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 GT 24 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 (1) .00 .19 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .19 (2) .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 ALL SPEEDS 36 8 12 3 4 1 8 20 31 47 68 69 59 62 50 42 0 520 (1) 6.92 1.54 2.31 .58 .77 .19 1.54 3.85 5.96 9.04 13.08 13.27 11.35 11.92 9.62 8.08 .00 100.00 (2) .42 .09 .14 .04 .05 .01 .09 .24 .37 .55 .80 .81 .70 .73 .59 .50 .00 6.14 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN06-DEC06 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS ALL CLASS FREQUENCY (PERCENT) = 100.00 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPH CALM 0 0 1 0 0 0 1 0 0 0 0 2 0 0 0 0 0 4 (1) .00 .00 .01 .00 .00 .00 .01 .00 .00 .00 .00 .02 .00 .00 .00 .00 .00 .05 (2) .00 .00 .01 .00 .00 .00 .01 .00 .00 .00 .00 .02 .00 .00 .00 .00 .00 .05 C-3 13 11 12 11 13 14 15 11 18 16 19 11 12 18 16 11 0 221 (1) .15 .13 .14 .13 .15 .17 .18 .13 .21 .19 .22 :13 .14 .21 .19 .13 .00 2.61 (2) .15 .13 .14 .13 .15 .17 .18 .13 .21 .19 .22 .13 .14 .21 .19 .13 .00 2.61 4-7 86 41 75 67 81 89 92 84 87 99 120 112 111 128 111 76 0 1459 (1) 1.01 .48 .89 .79 .96 1.05 1.09 .99 1.03 1.17 1.42 1.32 1.31 1.51 1.31 .90 .00 17.22 (2) 1.01 .48 .89 .79 .96 1.05 1.09 .99 1.03 1.17 1.42 1.32 1.31 1.51 1.31 .90 .00 17.22 8-12 203 103 100 120 114 102 152 154 159 261 344 347 335 431 361 183 0 3469 (1) 2.40 1.22 1.18 1.42 1.35 1.20 1.79 1.82 1.88 3.08 4.06 4.09 3.95 5.09 4.26 2.16 .00 40.94 (2) 2.40 1.22 1.18 1.42 1.35 1.20 1.79 1.82 1.88 3.08 4.06 4.09 3.95 5.09 4.26 2.16 .00 40.94 13-18 89 80 164 65 32 23 58 74 40 117 320 292 291 452 278 60 0 2435 (1) 1.05 .94 1.94 .77 .38 .27 .68 .87 .47 1.38 3.78 3.45 3.43 5.33 3.28 .71 .00 28.73 (2) 1.05 .94 1.94 .77 .38 .27 .68 .87 .47 1.38 3.78 3.45 3.43 5.33 3.28 .71 .00 28.73 19-24 11 32 71 28 26 7 10 19 2 10 51 23 63 190 142 12 0 697 (1) .13 .38 .84 .33 .31 .08 .12 .22 .02 .12 .60 .27 .74 2.24 1.68 .14 .00 8.23 (2) .13 .38 .84 .33 .31 .08 .12 .22 .02 .12 .60 .27 .74 2.24 1.68 .14 .00 8.23 GT 24 1 8 50 9 7 2 7 10 0 1 1 10 24 38 21 0 0 189 (1) .01 .09 .59 .11 .08 .02 .08 .12 .00 .01 .01 .12 .28 .45 .25 .00 .00 2.23 (2) .01 .09 .59 .11 .08 .02 .08 .12 .00 .01 .01 .12 .28 .45 .25 .00 .00 2.23 ALL SPEEDS 403 275 473 300 273 237 335 352 306 504 855 797 836 1257 929 342 0 8474 (1) 4.76 3.25 5.58 3.54 3.22 2.80 3.95 4.15 3.61 5.95 10.09 9.41 9.87 14.83 10.96 4.04 .00 100.00 (2) 4.76 3.25 5.58 3.54 3.22 2.80 3.95 4.15 3.61 5.95 10.09 9.41 9.87 14.83 10.96 4.04 .00 100.00 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

ENCLOSURE 3 TO SBK-L-07074 Radiation Dose Assessment

Seabrook Station Radiological Effluent Impact Assessment For 2006 (Annual Radioactive Effluent Release Report)

I. Summary Seabrook Technical Specification Sections 6.7.6.g.4 & 9 require that limitations be placed on the quarterly and annual doses or dose commitments to Members of the Public from radioactive materials in liquid and gaseous effluents released from the station to Unrestricted Areas at or beyond the site boundary conforming to the dose objectives of Appendix I to 10 CFR Part 50. Technical Specification 6.7.6.g.8 requires that limitations on the quarterly and annual air doses resulting from noble gases released in gaseous effluents to areas beyond the site boundary also conform to Appendix I to 10 CFR Part 50. In a similar fashion, Technical Specification 6.7.6.g. 11 requires limitations on the annual dose or dose commitment to any Member of the Public due to radioactivity and radiation from uranium fuel cycle sources conforming to the EPA Radiation Standards in 40 CFR Part 190. The following table details the above referenced effluent dose limits.

DOSE OBJECTIVE CRITERIA FOR COMPLIANCE EFFLUENT TYPE DOSE TYPE QUARTERLY LIMITS ANNUAL LIMITS LIQUIDS (IOCFR50, Total Body 1.5 mrem 3 mrem APP. I) Max. Organ 5 mrem 10 mrem Gamma Air 5 mrad 10 mrad NOBLE GAS (10CFR50, APP. I) Beta Air 10 mrad 20 mrad GAS PARTICULATE (IOCFR50, APP. I) Max. Organ 7.5 mrem 15 mrem TOTAL DOSE Total Body & organ 25 mrem (40CFRI90) T d

[liquids, gas, direct] yroi 75 mrem Technical Specification 6.8.1.4 and the Seabrook Offsite Dose Calculation Manual (ODCM) Part A, Section 10.2, provides that the Station's Annual Radioactive Effluent Release Report include a demonstration of compliance with the above off-site dose limitations, as well as the determination of dose impacts to Members of the Public who may be associated with permitted activities inside the site boundary.

Doses resulting from actual liquid and gaseous effluents from Seabrook Station during 2006 were calculated in accordance with Method II as defined in the Station Offsite Dose Calculation Manual. The calculation methods follow the models in Regulatory Guide 1.109 (Reference 1). The assessments included maximum whole body doses and organ doses from all liquid releases, maximum offsite organ doses resulting from airborne iodines, tritium and particulate radionuclides with half-lives greater than eight days, and maximum offsite beta air and gamma air doses from airborne noble gases. Calculated dose impacts from airborne effluents included atmospheric dispersion estimates utilizing concurrent meteorology recorded by the Station's on-site meteorological tower. In addition, the potential direct dose 1

from fixed radiation sources from plant operations was evaluated as part of the assessment required under 40 CFR Part 190 for doses from the uranium fuel cycle.

Doses were also calculated for the special receptor locations inside the site boundary where the public might be granted access for recreational or educational purposes. The Science and Nature Center is located in the southwest portion of the site and offers educational opportunities on nuclear power and the environment. The "Rocks" is an area northeast of the main plant facilities with access to Brown's Creek and the tidal marsh that borders the site.

All calculated liquid and gaseous pathway doses for the 2006 reporting period are well below the dose criteria of 10CFR50, Appendix I, and the dose limits for effluent releases stated in the ODCM. In addition, the total dose to the most limiting Member of the Public due to the combined exposure to plant-related direct radiation, and liquid and gaseous effluents, was below the dose standards of 40CFR190.

2

II. Method for Calculating the Total Body and Maximum Organ Doses Resulting from Liquid Releases Liquid waste generated during plant operations is processed and discharged to the environment via the station's circulating water-cooling system. The cooling system utilizes an offshore-submerged multi-port diffuser discharge for rapid dissipation and mixing of liquid effluents in the ocean environment. A 22-port diffuser section of the discharge system is located in approximately 50 to 60 feet of water with each nozzle 7 to 10 feet above the sea floor. Eleven riser shafts, with two diffuser nozzles each for the diffuser, are spaced about 100 feet apart over a distance of about 1000 feet. Water is discharged in a generally eastward direction away from the shoreline through the multiport diffuser, beginning at a location over one mile offshore. During power operations, these high velocity jets passively entrain about ten volumes of fresh water into the near field jet-mixing region before the plume reaches the water surface.

This arrangement also effectively prevents the discharge plume (at least to the I degree or 40 to I dilution isopleth) from impacting the shoreline over the tidal cycle.

During shutdown periods, the high velocity jet mixing created by the normal circulating water flow at the diffuser nozzles is reduced. However, mixing within the discharge tunnel water volume is significantly increased due to the long transit time for batch discharges to travel the three miles from the plant through the 19-foot diameter tunnels to the diffuser nozzles. Additional mixing of the effluent in the near field assures that an equivalent overall 10 to 1 dilution occurs by the time the effluent reaches the ocean surface.

The exposure pathways considered in the calculations of total body and maximum organ doses resulting from liquid discharges from Seabrook Station are limited to ingestion of aquatic foods and exposure to shoreline deposits. The dose calculations do not include the ingestion of potable water or irrigated vegetation as potential exposure pathways because the liquid effluents from the plant are discharged into salt water.

The dose assessment models utilized in the Offsite Dose Calculation Manual (ODCM) (Reference

2) are taken from Regulatory Guide 1.109 (Reference 1). The total body and organ doses are evaluated for each of the four age groups (i.e., infant, child, teen and adult) to determine the maximum total body dose and maximum organ dose via all existing exposure pathways (i.e., fish and aquatic invertebrate ingestion, and shoreline exposure) to an age-dependent individual from all detected radionuclides in plant releases.

The values for the various factors considered in the model equations are provided in Regulatory Guide 1.109 and the ODCM (see Table D). The flow rate of the liquid effluent (F) and the radionuclide activities (Qi) are measured specifically prior to each liquid release. The values for half-lives for radionuclides (T,, 2) and their radioactive decay constants (Xi) have been taken from Kocher (Reference 3).

Table A presents the calculated liquid pathway doses for each calendar quarter and total for the year. The calculated annual doses as a percent of the applicable regulatory limits are shown in Table C.

The estimated quarterly and annual doses resulting from liquid effluents to members of the public are well below all dose limit criteria.

3

III. Method for Calculating the Gamma and Beta Air Doses from Noble Gases Gamma and beta air doses due to noble gases in gaseous effluents are calculated for several receptor locations when noble gases are recorded in effluents. Those locations include the points of estimated highest off-site ground level air concentration of radioactive material, site boundary (or closest point on the opposite shoreline in directions which are bordered by the tidal marsh), nearest resident, nearest vegetable garden, and nearest milk animal within five miles for each of the sixteen principle compass directions. The special on-site receptor locations (Science and Nature Center and the "Rocks")

are also included.

Atmospheric dispersion factors (i.e., X/Q factors) calculated from recorded concurrent site meteorological data (i.e., meteorological data measurements taken during the time of the release) are used in the estimation of receptor specific air concentrations due to station effluents. The atmospheric dispersion estimations utilize methodology generally consistent with US NRC Regulatory Guide 1.111 (Reference 4).

Beta air doses use undepleted X/Q's and assumes a semi-infinite plume at the point of exposure. Gamma air doses are calculated using the finite cloud model presented in "Meteorology and Atomic Energy -

1968" (Reference 5). That model is implemented through the definition of an effective gamma atmospheric dispersion factor [X/Q7] (Reference 6) and the replacement of the undepleted X/Q in the infinite cloud dose equation by [X/Q'].

The release point of effluents is also considered in the atmospheric dispersion calculation. The primary vent stack is treated as a "mixed-mode" release, as defined in Regulatory Guide 1.111. These effluents are considered to be part-time ground level / part-time elevated releases depending on the ratio of primary vent stack exit velocity relative to the speed of prevailing wind. All other release points (e.g.,

Turbine Building and Chemistry lab hoods) are considered ground-level releases. The beta air and gamma air dose calculations are consistent with the models presented in Regulatory Guide 1.109 (Reference 1).

The values for the dose factors, DFi and DF 1O,have been taken from Table B-i in Regulatory Guide 1.109.

Table A presents the calculated maximum off-site gamma air and beta air doses for each calendar quarter and year. The calculated annual doses as a percent of the applicable regulatory limit are shown in Table C. The estimated quarterly and annual air doses resulting from noble gas effluents are well below all dose limit criteria.

4

IV. Method for Calculating the Critical Organ Dose Resulting from lodines, Tritium and Particulates with T 1/2 Greater than 8 Days in Gaseous Releases Regulatory Guide 1.109 dose models are applied in the calculation of the critical organ doses from iodines, tritium and particulate radionuclides released into the atmosphere during reporting period. Atmospheric dispersion and deposition factors (i.e., depleted X/Q and D/Q factors) calculated with concurrent meteorological data (i.e., meteorological data measurements taken during the time of the release) are used in the determination of gaseous pathway doses. The dispersion models are described in Section B.7.3.2 &

B.7.3.3 of the Seabrook ODCM.

Potential exposure pathways associated with gaseous effluent are (i) external irradiation from radioactivity deposited on the ground surface, (ii) inhalation, and (iii) ingestion of vegetables (both fresh leafy and stored), meat, and milk. Dose estimates were determined for the site boundary and for the locations of the nearest resident, vegetable garden, and milk animal in each of the sixteen principle compass directions.

The locations of the nearest resident, vegetable garden and milk animal in each sector were identified by the 2006 Annual Land Use Census as required by ODCM Control C.9.2.1 (see Table F). Additionally, doses were calculated at the point of approximate maximum ground level air concentration of radioactive materials in gaseous effluent. Conservatism in the dose estimates was maintained by assuming that the vegetable garden pathway was active at each milk animal location. Though not required to be part of the land use census, meat animal (cattle) locations are included in the assessment when identified. Meat and milk animals were assumed to receive their entire intake from pasture during the second and third quarters.

This is a conservative assumption because most dairy operations utilize supplemental feeding when animals are on pasture, or actually restrict animals to full time silage feeding throughout the entire year.

Table E provides the reference sources for dose model parameter assumptions used in the dose assessment.

The maximum organ doses were determined by summing the contributions from all exposure pathways at each location, and sorting in descending order. Doses were calculated for the whole body, GI-LLI, bone, liver, kidney, thyroid, lung, and skin for adults, teenagers, children, and infants. The estimated quarterly and annual organ doses due to iodines, tritium and particulates at the location of the maximally exposed individual are reported in Table A.

The estimated organ doses from iodines, tritium and particulates in gaseous effluents are well below the IOCFR50, Appendix I dose criteria for the reporting period (See Table C for calculated dose as a percentage of annual limits).

5

V. Total Dose (40 CFR Part 190) 40 CFR 190 states that the annual dose equivalent should not exceed 25 mrem to the whole body, 75 mrem to the Thyroid, or 25 mrem to any other organ of any Member of the Public from all uranium fuel cycle sources. To show compliance with this standard, the maximum doses for both the liquid and gaseous pathways from Seabrook Station are added together with the whole body dose from noble gas releases and any direct radiation component attributed to plant fixed sources to the maximum receptor location. Since there are no other uranium fuel cycle facilities within five miles of Seabrook, no additional impacts from sources beyond Seabrook Station need be considered.

The sum of the maximum annual whole body doses to Members of the Public from all exposure pathways for liquid and gaseous effluents, plus the direct external dose from station fixed sources, was 4.56E-02 mrem to a hypothetical individual at or beyond the site boundary. The maximum organ dose (including the thyroid) to any age group from all exposure pathways including direct radiation was 4.68E-02 mrem.

Table B illustrates the total dose projections from all station sources to the maximum potential off-site individual for the year 2006 and demonstrates compliance with the EPA's environmental radiation standard for the uranium fuel cycle per 40 CFR Part 190 (See Table C for total dose as a percentage of annual limit).

6

VI. References

1. Regulatory Guide 1.109, Revision 1,"Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purposes of Evaluating Compliance with 10CFR Part 50, Appendix I", USNRC, October 1977.
2. Seabrook Station Offsite Dose Calculation Manual (ODCM), Revision 30, Effective Date 06-05-06.
3. Kocher, D.C., Dose-Rate Conversion Factors for Exposure to Photons and Electrons, Health Physics, Vol. 45, No. 3, Sept. 1983.
4. Regulatory Guide 1.111, Revision 1, "Method for Estimating Atmospheric Transport and Dispersion of Gaseous Effluents in Routine Releases from Light-Water Cooled Reactors",

USNRC, July 1977.

5. Slade, D.H., "Meteorology and Atomic Energy - 1968", USAEC, July 1968.
6. Hamawi, J.N., "AEOLUS-2 A computer Code for the Determination of Continuous and Intermittent-Release Atmospheric Dispersion and Deposition of Nuclear Power Plant Effluents in Open-Terrain Sites, Coastal Sites, and Deep-River Valleys for the Assessment of Ensuing Doses and Finite-Cloud Gamma Radiation Exposures", Entech Engineering, Inc., March 1988.

7

Table A Seabrook Station 2006 Annual Radioactive Effluent Release Report Maximum (a) Off-Site Doses and Dose Commitments to Members of the Public Dose (mrem)(b)

Release Type 1st 2nd 3rd 4th Year(c)

Quarter Quarter Quarter Quarter 2006 Liquid Effluents:

Total Body Dose 3.5 1E-05 2.32E-05 3.38E-04 3.60E-04 7.56E-04 (1) (1) (1) (2)

Organ Dose 5.22E-05 3.13E-05 4.26E-04 9.85E-04 1.49E-03 (4) (3) (4) (5)

Airborne Effluents:

Organ Dose from lodines, 1.61E-03 1.84E-02 5.73E-03 1.93E-02 4.50E-02 Tritium, and Particulates (6) (7) (8) (9)

Noble Gases Beta Air 2.44E-06 3.94E-06 1.28E-05 3.12E-05 5.04E-05 (mrad) (10) (12) (13) (15)

Gamma Air 2.21E-06 6.43E-06 1.34E-05 3.51E-04 3.73E-04 (mrad) (10) (11) (14) (14)

Direct Dose Offsite From Plant Operation(e)

Doses (mrem) at Receptor Locations Inside Site Boundary(d):

Science and Nature Center (SW, 488m): 5.29E-07 1.51E-05 2.41 E-06 1.51E-05 3.32E-05 Organ Dose (mrem) (dl) (dl) (dl) (d 1)

The "Rocks" (NE/ENE, 244m): 8.21E-05 8.59E-05 2.1 1E-04 3.87E-04 7.65E-04 Organ Dose (mrem) (dl) (dl) (d2) (d2) 8

Table A (continued) 2006 Annual Radioactive Effluent Release Report Maximum (a)Off-Site Doses and Dose Commitments to Members of the Public NOTES:

(a) "Maximum means the largest fraction of corresponding 10CFR50, Appendix I, dose design objective.

(b) The numbered footnotes indicate the age group, organ, and location (compass sector and distance from the primary vent in meters) of the dose receptor, where appropriate.

(1) Adult (2) Child (3) Liver of an adult.

(4) GI-LLI of an adult.

(5) Bone of a child.

(6) Liver, kidney, lung, GI-LLI, thyroid, and whole body of a Child, ESE 2734 m.

(7) Liver, kidney, lung, GI-LLI, thyroid, and whole body of a Child, SW 1130 m.

(8) Liver, kidney, lung, GI-LLI, thyroid, and whole body of a Child, W 1315 m.

(9) Thyroid of a Child, SW 1130 m (10) ESE 2276 m (11) NW 914m (12) SW 1022 m (13) W 974 m (14) NNW 914 m (15) NNW 2400 m (c) "Maximum" dose for the year is the sum of the maximum doses for each quarter. This results in a conservative yearly dose estimate, but still well within the limits of 10CFR50.

(d) For each special receptor location, the whole body and organ doses calculated for the airborne effluent releases were adjusted by the occupancy factor provided in Seabrook's ODCM (i.e.,

0.0014 for the Science and Nature Center and 0.0076 for the "Rocks"). It should also be noted that for 2006 actual occupancy factors were much lower (close to zero) since access to the site by the general public has been greatly restricted for security reasons following the terrorist attacks on America on 09/11/01. For conservatism, the previous factors as listed in the ODCM were applied for an estimate of upper bound doses and comparison with calculated impacts for year's pre September 11, 2001. Where appropriate, the numbered footnotes indicate the organ and age group of the dose receptor:

(dl) Liver, kidney, lung, GI-LLI, thyroid, and whole body of a teen.

(d2) Thyroid of a teen.

(e) Only station sources are considered since there are no other facilities within five miles of Seabrook Station. 2006 data for the closest off-site environmental TLD locations in each sector (as listed in Table B.4-1 of Seabrook's ODCM) were compared to pre-operational data from 1986-1988 for the same locations. No statistical difference, which could be attributed to station sources, was identified.

9

Table B Seabrook Station 2006 Annual Radioactive Effluent Release Report Total Dose to Maximum Off-Site Individual (40CFR190)

Release Source R elease_ _

Total Body f Maximum Organ(a)

_Source (mrem) (mrem )

Liquids 7.56E-04 1.49E-03 Noble Gases 2.49E-04 2.49E-04 Gas lodines, Tritium & 4.46E-02 4.50E-02 Particulates Direct Radiation 0 0 Annual Total 4.56E-02 4.68E-02 (a) Maximum organ includes consideration of the thyroid.

10

Table C Seabrook Station 2006 Annual Radioactive Effluent Release Report Calculated 2006 Maximum Doses Versus ADplicable Limits Applicable ODCM Calculated Percent ODCM Annual Annual (2006) of Receptor Control Limit Dose Limit Offsite Liquid Effluents Whole Body Dose C.6.2.1 3 mrem 7.56E-04 mrem 0.025%

Organ Dose C.6.2.1 10 mrem 1.49E-03 mrem 0.015%

Airborne Effluents Organ Dose (iodines, tritium, and part.) C.7.3.1 15 mrem 4.50E-02 mrem 0.300%

Gamma Air Dose (noble gases) C.7.2.1 10 mrad 3.73E-04 mrad 0.0037%

Beta Air Dose (noble gases) C.7.2.1 20 mrad 5.04E-05 mrad 0.00025%

All Plant Sources (a)

Whole Body Dose C.8.1.1 25 mrem 4.56E-02 mrem 0.18%

Organ Dose C.8.1.1 25 mrem 4.68E-02 mrem 0.19%

Onsite (Science and Nature Center, 488m SW)

Airborne Effluents Organ Dose (iodines, tritium, and part.) C. 7 .3 .1(b) 15 mrem 3.32E-05 mrem 0.00022%

Onsite (The "Rocks", 244m NE/ENE)

Airborne Effluents Organ Dose (iodines, tritium, and part.) C. 7 .3 .1(b) 15 mrem 7.65E-04 mrem 0.0051%

(a) The "all plant sources" doses are the sum of the whole body doses and maximum organ doses from liquid, noble gas, and iodines/tritium/particulate releases as well as direct radiation from fixed station sources.

(b) ODCM Part A, Section 10.2 states that the annual effluent report shall include an assessment of the radiation doses from radioactive liquids and gaseous effluents to members of the public due to their activities inside the site boundary during the report period. The referenced limits (C.7.2.1 & C.7.3.1) are the acceptable doses from liquid and gaseous effluents to areas at and beyond the site boundary and are considered to be appropriate for comparison purposes.

11

Table D Seabrook Station 2006 Annual Radioactive Effluent Release Report Sources of the Values of Factors Used in Liouid Dose Eouations Factor Definition Source Uap Usage factor Table B.7-1, Station ODCM MP Mixing ratio Section B.7.1, Station ODCM (value=O.1 for aquatic foods and 0.025 for shoreline)

Bip Equilibrium bioaccumulation factor Table A-l, Reg. Guide 1.109 Daipj Dose factor Tables E-1 1 through E-14, R.G. 1.109 Nuclide transit time Table E-15, Reg. Guide 1.109 Transfer coefficient from water to Reg. Guide 1.109 sediment Period of activity buildup in sediment Table B.7-2, Station ODCM tb or soil Shoreline width factor 1W Table A-2, Reg. Guide 1.109 (value=0.5) 12

Table E Seabrook Station 2006 Annual Radioactive Effluent Release Report Sources of Values for the Factors Used in Dose Equations for Gaseous Releases Factor Definition Source Period of activity buildup in sediment Table B.7-2, Station ODCM tb or soil Nuclide decay constant Kocher (Reference 3)

DFGj Ground plane dose factor Table E-6, Reg. Guide 1.109

[X/Q]D Atmospheric dispersion factor Calculated following Reg. Guide 1.111 Ra Breathing rate Table B.7-3, Station ODCM DFAija Inhalation dose factor Tables E-7 through E-10, Reg. Guide 1.109 di Nuclide deposition rate Reg. Guide 1.109 Soil surface density Table B.7-2, Station ODCM Crop, leafy vegetable, or pasture Table B.7-2, Station ODCM te grass exposure period Average time from crop harvest to Table B.7-2, Station ODCM th consumption Yv Agricultural productivity by unit area Table B.7-2, Station ODCM Fraction of deposited activity Table E- 15, Reg. Guide 1.109 r retained on crops, leafy vegetables, or pasture grass Stable element transfer coefficient Table E-1, Reg. Guide 1.109 from soil to produce, leafy vegetable, or pasture grass Fractional equilibrium ratio Reg. Guide 1.109 P

H Ambient absolute humidity Table B.7-2, Station ODCM Stable element transfer coefficient Tables E-1 and E-2, Reg. Guide 1.109 Fm from feed to milk 13

Table E (continued)

Seabrook Station 2006 Annual Radioactive Effluent Release Report Sources of Values for the Factors Used in Dose Equations for Gaseous Releases Factor Definition Source Average time from feed to milk to Reg. Guide 1.109 tf consumption Fraction of the year that animals Table B.7-2, Station ODCM fp graze on pasture Fraction daily feed pasture grass Table B.7-2, Station ODCM Stable element transfer coefficient Table E-I, Reg. Guide 1.109 Ff from feed to meat Average time from meat animal Table E-15, Reg. Guide 1.109 ts slaughter to consumption DFIija Ingestion dose factor Tables E-1 1 through E-14, R.G.1.109 Annual intake of produce Table B.7-3, Station ODCM UA a Annual intake of milk Table B.7-3, Station ODCM F

Ua Annual intake of leafy vegetables Table B.7-3, Station ODCM Ingestion rate fractions for garden Reg. Guide 1.109 fg produce Ingestion rate fractions for garden Reg. Guide 1.109 fl leafy vegetables Rate constant for activity removal Table E-15, Reg. Guide 1.109 from plant and leaf surfaces by weathering QF Animal consumption rate Table E-3, Reg. Guide 1.109 14

Table F Seabrook Station 2006 Annual Radioactive Effluent Release Report Receptor Locations* for Seabrook Station Milk Animals Nearest Nearest within 5 Mile Resident Garden Radius Sector mile (km) mile (km) mile (km)

N 2.21 (3.55) 2.47 (3.97)

NNE 1.89 (3.04) 1.89 (3.04) 5.03 (8.09)

NE 1.82 (2.92) 2.17 (3.50)

ENE 1.44 (2.31)

E 1.60 (2.58)

ESE 1.70 (2.73)

SE 1.46 (2.36) 2.60 (4.18)

SSE 1.02 (1.65)

S 0.75 (1.21) 0.76 (1.22)

SSW 0.69 (1.12) 0.88 (1.42)

SW 0.70 (1.13) 1.12 (1.80)

WSW 1.16 (1.87) 1.43 (2.31)

W 0.82 (1.32) 0.87 (1.40)

WNW 0.69(1.11) 0.94 (1.52)

NW 0.79 (1.27) 0.79 (1.27) 4.30 (6.93)

NNW 0.64 (1.04) 0.64 (1.04) 3.30 (5.32)

  • Locations based on 2006 Land Use Census.

15

Retrieved from "https://kanterella.com/w/index.php?title=ML071220463&oldid=2660831"