SBK-L-08073, 2007 Annual Radioactive Effluent Release Report

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2007 Annual Radioactive Effluent Release Report
ML081570602
Person / Time
Site: Seabrook NextEra Energy icon.png
Issue date: 04/30/2008
From: St.Pierre G
Florida Power & Light Energy Seabrook
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
FOIA/PA-2010-0209, SBK-L-08073
Download: ML081570602 (57)
v • d • e


Text

aFPL Energy FPL Energy Seabrook Station P.O. Box 300 Seabrook, NH 03874 Seabrook Station (603) 773-7000 April 30, 2008 Docket No. 50-443 SBK-L-08073 U.S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, DC 20555-0001 Seabrook Station 2007 Annual Radioactive Effluent Release Renort Pursuant to 10CFR 50.36(a)(2) and Technical Specification 6.8.1.4, FPL Energy Seabrook, LLC submits the Annual Radioactive Effluent Release Report for 2007. A copy of the Offsite Dose

,Calculation Manual (ODCM) is also provided pursuant to Technical Specification 6.13.c. A summary of the changes to the ODCM is included in Enclosure 1, Appendix A.

The following information is provided in the enclosures:

Enclosure 1 Effluent release data as required by Regulatory Guide 1.21 Enclosure 2 Joint frequency distributions of wind speed, wind direction and atmospheric stability Enclosure 3 Radiation dose assessment Enclosure 4 Offsite Dose Calculation Manual (ODCM), Revision 31 Should you have any questions regarding this letter, please contact William T. Cash, Chemistry Department Manager, at (603) 773-7315.

Very truly yours, FPL Energy Seabrook, LLC Gene St. Pierre Site Vice President kbo9 an FPL Group company

U.S. Nuclear Regulatory Commission SBK-L-08073/ Page 2 cc: S.T Collins, NRC Region I Administrator G.E. Miller, NRC Project Manager, Project Directorate 1-2 W.J. Raymond, NRC Senior Resident Inspector Robert A. Oliveira, ANI

ENCLOSURE 1 TO SBK-L-08073 Effluent Release Data as Required by Regulatory Guide 1.21

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT Supplemental Information 2007 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 ýtCi/ml dissolved or entrained gas.
2. Effluent Concentrtion 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. Jodines: 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: 146
b. Total time for batch releases: 30696 minutes
c. Maximum time period for batch release: 458 minutes
d. Average time period for batch release: 210 minutes
e. Minimum time period for batch release: 23 minutes
f. Average stream flow during periods of release of effluents into a flowing stream: 1.69E+06 liters per minute B. Gaseous
a. Number of batch releases: 35
b. Total time for batch releases: 4927 minutes
c. Maximum time period for batch release: 2194 minutes
d. Average time period for batch release: 259 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: 0
b. Total activity released: N/A

TABLE 1A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2007 GASEOUS EFFLUENTS-SUMMATION OF ALL RELEASES Unit Quarter Quarter Quarter Quarter Est. Total A. Fission and activation qases

1. Total releases Ci 3.17E-02 2.85E-03 2.30E-03 1.03E-02 1.70E+01
2. Average release rate uCisec for period 4.08E-03 3.62E-04 2.89E-04 1.30E-03
3. Percent of applicable Technical Specification  %

limit 7.48E-04 1.22E-04 1.24E-04 3.00E-04 B. lodines

1. Total release Ci ND ND ND ND 1.50E+01
2. Average release rate for period ______________________ ____ NAINAI N/A N/A N/A N/A
3. Percent of applicable Technical Specification  %

limit N/A N/A N/A. N/A C. Particulates

1. Total release Ci ND ND ND ND 1.80E+011
2. Average releaseforrate prioducilsec for period N/A N/A N/A N/A
3. Percent of applicable Technical Specification  %

limit N/A N/A N/A N/A

4. Total alpha radioactivity Ci ND ND ND ND D. Tritium 1.Total release Ci 3.58E+01 4.79E+01 1.54E+01 1.88E+01 I 1.60E+01
2. Average release 'rate uCi/sec for period 4.60E+00 6.09E+00 1.94E+00 2.37E+00
3. Percent of applicable Technical Specification  %

limit 4.0E0 6.53E-01 2.08E-01 2.52E-01

TABLE 1B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)

GASEOUS EFFLUENTS-ELEVATED RELEASES BATCH Nuclides Released Unit Quarter Quarter Quarter Quarter

1. Fission and activation gases argon-41 Ci 3.14E-02 2.83E-03 2.19E-03 8.20E-03 krypton-85 Ci ND ND ND ND krypton-85m Ci 1.06E-04 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 1.54E-05 2.21E-05 ND 1.95E-03 xenon-1 33m Ci ND ND ND ND xenon-135 Ci 1.71E-04 ND 1.07E-04 1.51E-04 xenon-135m Ci ND ND ND ND xenon-138 Ci ND ND 7.73E-04 2.61E-03 Ci unidentified Oi 1ND ND ND ND Total for period Ci 3.1 7E-02 2.85E-03 3.07E-03 1 .29E-02
2. Iodines iodine-131 Ci ND ND ND ND iodine-1 33 Ci ND ND ND ND iodine-1 35 Ci ND ND ND ND Total for period Ci 0.OOE+00 0.00E+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-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 O.OOE+00 O.OOE+00 0.OOE+00 O.OOE+00

TABLE lB EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)

GASEOUS EFFLUENTS-ELEVATED RELEASES CONTINUOUS Nuclides Released Unit Quarter Quarter Quarter Quarter

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 Q.QQE+00 O.OOE+00
2. Iodines iodine-131 Ci ND ND ND ND iodine-1 33 Ci ND ND ND ND iodine-1 35 Total for period Ci Ci J.00E+00 ND ND N.D0E+00 ND N.D0E+00 ND N.D0E+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 cobalt-58 Ci ND ND ND ND 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 0.00E+00 0.00E+00 0.00E+00 O.OE+00

TABLE iC EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)

GASEOUS EFFLUENTS-GROUND LEVEL RELEASES BATCH Nuclides Released Unit Quarter Quarter Quarter Quarter

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-131rm Ci ND ND ND ND xenon-133m Ci ND ND ND ND xenon-133 Ci ND ND ND ND xenon-1 35 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 0.OOE+00
2. Iodines iodine-131 Ci ND ND ND ND iodine-1 32 Ci ND ND ND ND iodine-1 33 Ci ND ND ND ND iodine-135 Ci ND ND ND ND Total for period Ci 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+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-57 Ci ND ND ND ND cobalt-58 Ci ND ND ND ND cobalt-60 Ci ND ND ND ND manganese-54 Ci ND ND ND ND iron-59 Ci ND ND ND ND niobium/zirconium-95 Ci ND ND ND ND chromium-51 Ci ND ND ND ND technetium-99m Ci ND ND ND ND bromine-82 Ci ND ND ND ND unidentified Ci ND ND ND ND Total for period Ci O.OOE+00 O.00E+00 O.OOE+00 0.OOE+00

TABLE iC

'EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)

GASEOUS EFFLUENTS-GROUND LEVEL RELEASES CONTINUOUS Nuclides Released Unit Quarter Quarter Quarter Quarter

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 i_ Ci Ci unidentified Ci ND ND ND ND

-Totalfor period Ci O.OOE+00 O.OOE+00 O.QOE+00 O.OOE+00

2. Iodines iodine-1 31 Ci ND ND ND ND iodine-1 33 Ci ND ND ND ND Ci Total for period Ci O.OOE+00 O.OOE+00 0.00E+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-1 36 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 ND 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 O.OOE+00 O.OOE+00

TABLE 2A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2007 LIQUID EFFLUENTS-SUM4MATION OF ALL RELEASES A. Fission and activation products f Unit Quarter1 1 uarter2 1uarter I Quarter4 Est.T°tar

1. Total releases Ci 1.09E-02 5.28E-03 2.80E-03 3.18E-03 6.00E+00
2. Average diluted concentration uCi/ml 2.56E-11 1.30E-11 6.03E-12 7.07E-12 durina oeriod
3. Percent of applicable limit  % 9.73E-03 7.27E-03 2.99E-03 1.05E-02 B. Tritium
1. Total release ci 6.41E+01 1.60E+02 1.62E+01 2.41E+02 8.00E+00
2. Average diluted concentration peioduCi/ml 1.50E-07 3.95E-07 3.49E-08 5.36E-07 duria
3. Percent of applicable limit  % 1.40E-02 8.04E-03 3.52E-03 5.68E-03 C. Dissolved and entrained gases
1. Total release ci ND ND ND ND 1.90E+01
2. Average diluted concentration N/A N/A N/A duiareiduCi/ml during periodI4 N/A 1
3. Percent of applicable limit  % N/A N/A N/A N/A D. Gross alpha radioactivity
1. Total release ci ND ND ND ND I1.00E+01

TABLE 2B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2007 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 ND ND ND ND cesium-137 Ci 1.06E-05 ND 1.43E-06 ND iodine-131 Ci ND ND ND ND iodine-133 Ci ND ND ND ND cobalt-57 Ci ND ND 1.24E-06 1.32E-05 cobalt-58 Ci 1.26E-03 1.75E-04 3.55E-04 3.61 E-04 cobalt-60 Ci 2.47E-04 6.64E-05 2.96E-04 1.29E-03 chromium-51 Ci ND ND ND ND iron-55 Ci 8.60E-03 4.81E-03 2.06E-03 1.1OE-03 iron-59 Ci ND ND ND ND zinc-65 Ci ND ND ND ND manganese-54 Ci 3.91E-05 ND 1.68E-05 3.66E-05 zirconium-niobium-95 Ci ND ND ND ND molybdenum-99 Ci ND ND ND ND technetium-99m Ci ND ND ND ND silver-110m 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 7.41E-04 2.32E-04 7.31E-05 3.81E-04 antimony-126 Ci ND ND ND ND niobium-97 Ci ND ND ND ND tin-1_17m 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) I Cil 1.09E-02 5.28E-03 2.80E-03 -3.18E-03 xenon-1 33 = ND ND ND ND xenon-135 Ci ND ND ND ND

TABLE 2B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2007 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 ND cobalt-60 Ci ND ND ND ND 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) I O.OOE+0O O.OOE+00 O.0OE+00 0.0OE+00 xenon-131m Ci ND ND ND IND xenon-133m Ci ND ND ND ND xenon-1 33 Ci ND ND ND ND xenon-1 35 Ci ND ND ND ND

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2007 SOLID WASTE AND IRRADIATED FUEL SHIPMENTS A. SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL (Not irradiated fuel)

1. Type of waste Unit 1eyear Est. Total Period Error,%
a. Spent resins, filter sludges, evaporator In 2.76E-01 Bottoms, etc. Ci 4.12E+01 2.50E+01
b. Dry compressible waste, contaminated m3 5.82E+01 Equip, etc. Ci 2.30E+03
c. Irradiated components, control m3 N/A N/A Rods, etc. Ci
d. Other (describe) m3 CiN/A N/A
2. Estimate of major nuclide composition (by type of waste)
a. Ni-63 7.09E+O 1 Fe-55  % 1.34E+O1 Co-60.  % 6.63E+00 Co-58  % 5.65E+00 Mn-54  % 1.46E+00 Cs-137  % 8.59E-01 Sb-125  % 5.44E-01 Co-57  % 3.45E-01 H-3  % 1.41E-01 Cs-134  % 1.26E-01 Nb-94  % 4.71E-03
b. Fe-55  % "4.96E+O1 Ni-63  % 2.15E+01 H-3  % 1.50E+01 Co-60  % 7.74E+00 Co-58  % 4.94E+00 Mn-54  % 3.1I E-01 Cs-137  % 2.43E-01 Sb-125  % 2.34E-01 Nb-95  % 1.25E-01 Zr-95  % 1.05E-01 Co-57  % 7.87E-02 Cs- 134  % 3.97E-02 Tc-99  % 3.94E-02
c. N/A I% I N/A
d. N/A I% 1 N/A
3. Solid Waste Disposition Number of Waste Container Solidification Mode of Destination Shipments Class Type Agent Transportation 3 A General N/A Truck Duratek Design Kingston, TN 2 A General N/A Truck Duratek Design Oak Ridge, TN 3 A General N/A Truck EnergySolutions Design Clive, UT 2 B Type A N/A Truck Studsvik Erwin, 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: -ýý'

- dz.ý /Aý-j ý' - Date: 24

  • Reviewed By: Date: 31Z__308_

Approved By: Date: __C

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 2007.

The Change added a missing number "1" in Table A.5.2-1, item 4.c for minimum channels operable.

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 2007.

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, 2007 to December 31, 2007, 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. la 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 2007, 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: A review of the January 1, 2007 to December 31, 2007 time period indicated there were no unplanned, unanticipated or abnormal releases from the site to unrestricted areas of radioactive materials of gaseous or liquid effluents.

2007 Groundwater Monitoring Well Tritium information Well ID. Jan-07 Feb-07 Mar-07 Apr-07 May-07 Jun-07 Jul-07 Aug-07 Sept-07 Oct-07 Nov-07 Dec-07 (PCi/ml) (PCi/ml) (pCi/ml) (pCi/ml) (pCi/ml) (pCi/ml) (pCi/ml) (pCi/ml) (pCi/ml) (pCi/ml) (pCi/ml) (pCi/ml)

BD-1 < 5.57E-07 < 5.64E-07 < 6.10E-07 < 6.14E-07 BD-2 < 5.74E-07 < 5.56E-07 < 5.57E-07 < 6.01 E-07 < 6.20E-07 < 6.14E-07 BD-3 < 6.22E-07 < 6.14E-07 < 6.66E-07 < 5.76E-07 BD-4 < 6.20E-07 < 5.61E-07 < 6.20E-07 < 6.17E-07 BD-5 < 5.56E-07 < 6.07E-07 < 6.09E-07 < 5.74E-07 SC-1 < 5.56E-07 < 6.07E-07 SD-1 < 5.96E-07 < 5.56E-07 < 5.732-07 < 6.01E-07 < 5.83E-07 < 6.14E-07 SD-2 < 6.19E-07 < 5.55E-07 < 5.98E-07 < 6.12E-07 < 6.14E-07 SD-3 < 6.16E-07 < 5.54E-07 < 6.03E-07 < 6.04E-07 SD-4 < 5.58E-07 < 6.04E-07 < 6.11E-07 SW-1 7.42E-07 1.11E-06 1.36E-06 1.19E-06 8.53E-07 9.29E-07 9.69E-07 < 6.01E-07 8.59E-07 9.66E-07 9.64E-07 SW-2 < 6.56E-07 < 5.55E-07 SW-3 < 5.74E-07 5.92E-07 < 6.03E-07 < 6.14E-07 BU-1 < 6.27E-07 < 6.18E-07 < 6.23E-07 < 6.23E-07 SU-1 < 6.16E-07 < 6.07E-07 < 6.03E-07 < 6.14E-07 SB-12 < 6.22E-07 ND-10 < 5.54E-07 ND-15 < 5.90E-07 ND-20 < 5.54E-07 ND-25 <5.542-07

ENCLOSURE 2 TO SBK-L-08073 Joint Frequency Distributions of Wind Speed, Wind Direction and Atmospheric Stability

SEABROOK JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS A CLASS FREQUENCY (PERCENT) = 2.00 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 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 1 0 0 0 0 0 0 0 0 0 0 1 (1) .00 .00 .00 .00 .00 .00 .61 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .61 (2) .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 4-7 0 0 0 1 0 2 6 0 0 0 0 1 3 1 0 0 0 14 (1) .00 .00 .00 .61 .00 1.21 3.64 .00 .00 .00 .00 .61 1.82 .61 .00 .00 .00 8.48 (2) .00 .00 .00 .01 .00 .02 .07 .00 .00 .00 .00 .01 .04 .01 .00 .00 .00 .17 8-12 0 1 2 1 8 9 34 14 1 3 13 12 7 9 5 0 0 119 (1) .00 .61 1.21 .61 4.85 5.45 20.61 8.48 .61 1.82 7.88 7.27 4.24 5.45 3.03 .00 .00 72.12 (2) .00 .01 .02 .01 .10 .11 .41 .17 .01 .04 .16 .15 .08 .11 .06 .00 .00 1.44 13-18 0 0 0 0 1 0 1 0 1 3 4 6 3 6 6 0 0 31 (1) .00 .00 .00 .00 .61 .00 .61 .00 .61 1.82 2.42 3.64 1.82 3.64 3.64 .00 .00 18.79 (2) .00 .00 .00 .00 .01 .00 .01 .00 .01 .04 .05 .07 .04 .07 .07 .00 .00 .38 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 o00 .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 1 2 2 9 11 42 14 2 6 17 19 13 16 11 0 0 165 (1) .00 .61 1.21 1.21 5.45 6.67 25.45 8.48 1.21 3.64 10.30 11.52 7.88 9.70 6.67 .00 .00 100.00 (2) .00 .01 .02 .02 .11 .13 .51 .17 .02 .07 .21 .23 .16 .19 .13 .00 .00 2.00 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS B CLASS FREQUENCY (PERCENT) = 3.56 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 1 2 0 1 1 1 6 4 2 2 1 4 5 5 1 0 0 36 (1) .34 .68 .00 .34 .34 .34 2.04 1.36 .68 .68 .34 1.36 1.70 1.70 .34 .00 .00 12.24 (2) .01 .02 .00 .01 .01 .01 .07 .05 .02 .02 .01 .05 .06 .06 .01 .00 .00 .44 8-12 2 1 3 12 23 16 14 8 2 7 22 31 13 22 11 5 0 192 (1) .68 .34 1.02 4.08 7.82 5.44 4.76 2.72 .68 2.38 7.48 10.54 4.42 7.48 3.74 1.70 .00 65.31 (2) .02 .01 .04 .15 .28 .19 .17 .10, .02 .08 .27 .38 .16 .27 .13 .06 .00 2.33 13-18 0 0 1 4 3 1 2 0 0 1 7 6 4 14 16 1 0 60 (1) .00 .00 .34 1.36 1.02 .34 .68 .00 .00 .34 2.38 2.04 1.36 4.76 5.44 .34 .00 20.41 (2) .00 .00 .01 .05 .04 .01 .02 .00 .00 .01 .08 .07 .05 .17 .19 .01 .00 .73 19-24 0 0 0 0 0 0 0 0 0 0 0 0 0 3 2 0 0 5 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 1.02 .68 .00 .00 1.70 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .04 .02 .00 .00 .06 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .34 .00 .00 .00 .34 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .01 ALL SPEEDS 3 3 4 17 27 18 22 12 4 10 30 41 22 45 30 6 0 294 (1) 1.02 1.02 1.36 5.78 9.18 6.12 7.48 4.08 1.36 3.40 10.20 13.95 7.48 15.31 10.20 2.04 .00 100.00 (2) .04 .04 .05 .21 .33 .22 .27 .15 .05 .12 .36 .50 .27 .55 .36 .07 .00 3.56 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CA*I (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS C CLASS FREQUENCY (PERCENT) = 6.56 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 1 1 0 0 0 0 0 1 1 0 0 1 0 0 0 5 (1) .00 .00 .16 .18 .00 .00 .00 .00 .00 .18 .18 .00 .00 .18 .00 .00 .00 .92 (2) .00 .00 .01 .01 .00 .00 .00 .00 .00 .01 .01 .00 .00 .01 .00 .00 .00 .06 4-7 5 2 1 5 11 10 16 3 1 6 10 11 25 10 8 3 0 127 (1) .92 .37 .18 .92 2.03 1.85 2.96 .55 .18 1.11 1.85 2.03 4.62 1.85 1.48 .55 .00 23.48 (2) .06 .02 .01 .06 .13 .12 .19 .04 .01 .07 .12 .13 .30 .12 .10 .04 .00 1.54 8-12 5 3 2 20 23 25 16 12 1 6 25 31 43 50 23 5 0 290 (1) .92 .55 .37 3.70 4.25 4.62 2.96 2.22 .18 1.11 4.62 5.73 7.95 9.24 4.25 .92 .00 53.60 (2) .06 .04 .02 .24 .28 .30 .19 .15 .01 .07 .30 .38 .52 .61 .28 .06 .00 3.51 13-18 0 0 1 1 0 0 0 0 0 0 2 7 19 34 34 1 0 99 (1) .00 .00 .18 .18 .00 .00 .00 .00 .00 .00 .37 1.29 3.51 6.28 6.28 .18 .00 18.30 (2) .00 .00 .01 .01 .00 .00 .00 .00 .00 .00, .02 .08 .23 .41 .41 .01 .00 1.20 19-24 0 0 0 0 0 1 0 0 0 0 0 0 1 2 14 2 0 20 (1) .00 .00 .00 .00 .00 .18 .00 .00 .00 .00 .00 .00 .18 .37 2.59 .37 .00 3.70 (2) .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .01 .02 .17 .02 .00 .24 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 10 5 5 27 34 36 32 15 2 13 38 49 88 97 79 11 0 541 (1) 1.85 .92 .92 4.99 6.28 6.65 5.91 2.77 .37 2.40 7.02 9.06 16.27 17.93 14.60 2.03 .00 100.00 (2) .12 .06 .06 .33 .41 .44 .39 .18 .02 .16 .46 .59 1.07 1.18 .96 .13 .00 6.56 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS D CLASS FREQUENCY (PERCENT) = 50.68 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 1 0 1 0 3 (1) .00 .00 .02 .00. .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 .00 .02 .00 .07 (2) .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .01 .00 .04 C-3 31 31 18 27 16 17 9 11 24 15 23 29 38 45 43 36 0 413 (1) .74 .74 .43 .65 .38 .41 .22 .26 .57 .36 .55 .69 .91 1.08 1.03 .86 .00 9.88 (2) .38 .38 .22 .33 .19 .21 .11 .13 .29 .18 .28 .35 .46 .55 .52 .44 .00 5.01 4-7 105 59 74 101 110 57 44 58 66 83 98 129 153 165 149 117 0 1568 (1) 2.51 1.41 1.77 2.42 2.63 1.36 1.05 1.39 1.58 1.98 2.34 3.08 3.66 3.95 3.56 2.80 .00 37.49 (2) 1.27 .72 .90 1.22 1.33 .69 .53 .70 .80 1.01 1.19 1.56 1.85 2.00 1.81 1.42 .00 19.00 8-12 51 41 90 82 85 48 31 30 25 70 141 183 166 249 203 54 0 1549 (1) 1.22 .98 2.15 1.96 2.03 1.15 .74 .72 .60 1.67 3.37 4.38 3.97 5.95 4.85 1.29 .00 37.04 (2) .62 .50 1.09 .99 1.03 .58 .38 .36 .30 .85 1.71 2.22 2.01 3.02 2.46 .65 .00 18.77 13-18 10 8 45 19 17 21 1 0 0 10 43 21 49 131 159 12 0 546 (1) .24 .19 1.08 .45 .41 .50 .02 .00 .00 .24 1.03 .50 1.17 3.13 3.80 .29 .00 13.06 (2) .12 .10 .55 .23 .21 .25 .01 .00 .00 .12 .52 .25 .59 1.59 1.93 .15 .00 6.62 19-24 0 1 17 3 15 5 0 0 0 0 4 0 3 21 22 0 0 91 (1) .00 .02 .41 .07 .36 .12 .00 .00 .00 .00 .10 .00 .07 .50 .53 .00 .00 2.18 (2) .00 .01 .21 .04 .18 .06 .00 .00 .00 .00 .05 .00 .04 .25 .27 .00 .00 1.10 GT 24 0 0 0 0 12 0 0 0 0 0 0 0 0 0 0 0 0 12 (1) .00 .00 .00 .00 .29 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .29 (2) .00 .00 .00 .00 .15 .00 .00 .00 .00 .00 .00 .00 .00' .00 .00 .00 .00 .15 ALL SPEEDS 197 140 245 232 255 148 85 99 115 178 309 362 409 612 576 220 0 4182 (1) 4.71 3.35 5.86 5.55 6.10 3.54 2.03 2.37 2.75. 4.26 7.39 8.66 9.78 14.63 13.77 5.26 .00 100.00 (2) 2.39 1.70 2.97 2.81 3.09 1.79 1.03 1.20 1.39 2.16 3.75 4.39 4.96 7.42 6.98 2.67 .00 50.68 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS E CLASS FREQUENCY (PERCENT) = 24.64 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 2 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 4 (1) .05 .10 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .05 .00 .00 .20 (2) .01 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .05 C-3 21 13 16 34 14 18 10 10 15 25 34 39 57 57 45 22 0 430 (1) 1.03 .64 .79 1.67 .69 .89 .49 .49 .74 1.23 1.67 1.92 2.80 2.80 2.21 1.08 .00 21.15 (2) .25 .16 .19 .41 .17 .22 .12 .12 .18 .30 .41 .47 .69 .69 .55 .27 .00 5.21 4-7 31 15 10 11 29 17 28 23 39 52 116 254 217 175 127 55 0 1199 (1) 1.52 .74 .49 .54 1.43 .84 1.38 1.13 1.92 2.56 5.71 12.49 10.67 8.61 6.25 2.71 .00 58.98 (2) .38 .18 .12 .13 .35 .21 .34 .28 .47 .63 1.41 3.08 2.63 2.12 1.54 .67 .00 14.53 8-12 2 3 1 10 8 6 6 14 8 17 63 107 46 37 22 4 0 354 (1) .10 .15 .05 .49 .39 .30 .30 .69 .39 .84 3.10 5.26 2.26 1.82 1.08 .20 .00 17.41 (2) .02 .04 .01 .12 .10 .07 .07 .17 .10 .21 .76 1.30 .56 .45 .27 .05 .00 4.29 13-18 .0 0 1 4 2 5 0 2 0 0 7 1 0 4 1 0 0 27 (1) .00 .00 .05 .20 .10 .25 .00 .10 .00 .00 .34 .05 .00 .20 .05 .00 .00 1.33 (2) .00 .00 .01 .05 .02 .06 .00 .02 .00 .00 .08 .01 .00 .05 .01 .00 .00 .33 19-24 0 0 3 5 2 0 0 0 1 0 0 0 0 0 0 0 0 11 (1) .00 .00 .15 .25 .10 .00 .00 .00 .05 .00 .00 .00 .00 .00 .00 .00 .00 .54 (2) .00 .00 .04 .06 .02 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .13 GT 24 0 0 1 0 6 1 0 0 0 0 0 0 0 0 0 0 0 8 (1) .00 .00 .05 .00 .30 .05 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .39 (2) .00 .00 .01 .00 .07 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .10 ALL SPEEDS 55 33 32 64 61 47 44 49 63 94 220 401 320 273 196 81 0 2033 (1) 2.71 1.62 1.57 3.15 3.00 2.31 2.16 2.41 3.10 4.62 10.82 19.72 15.74 13.43 9.64 3.9B .00 100.00 (2) .67 .40 .39 .78 .74 .57 .53 .59 .76 1.14 2.67 4.86 3.88 3.31 2.38 .98 .00 24.64 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS F CLASS FREQUENCY (PERCENT) = 6.73 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 1 0 0 1 0 0 0 0 0 1 0 1 0 4 (1) .00 .00 .00 .00 .18 .00 .00 .18 .00 .00 .00 .00 .00 .18 .00 .18 .00 .72 (2) .00 .00 .00 .00 .01 .00 .00 .01 .00 .00 .00 .00 .00 .01 .00 .01 .00 .05 C-3 9 2 7 11 9. 4 1 1 3 6 17 30 71 65 40 13 0 289 (1) 1.62 .36 1.26 1.98 1.62 .72 .18 .18 .54 1.08 3.06 5.41 12.79 11.71 7.21 2.34 .00 52.07 (2) .11 .02 .08 .13 .11 .05 .01 .01 .04 .07 .21 .36 .86 .79 .48 .16 .00 3.50 4-7 3 0 0 3 5 1 3 1 1 5 16 53 53 63 45 7 0 259 (1) .54 .00 .00 .54 .90 .18 .54 .18 .18 .90 2.88 9.55 9.55 11.35 8.11 1.26 .00 46.67 (2) .04 .00 .00 .04 .06 .01 .04 .01 .01 .06 .19 .64 .64 .76 .55 .08 .00 3.14 8-12 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 0 0 3 (1) .00 .00 .00 .00 .18 .00 .00 .18 .00 .00 .18 .00 .00 .00 .00 .00 .00 .54 (2) .00 .00 .00 .00 .01 .00 .00 .01 .00 .00 .01 .00 .00 .00 .00 .00 .00 .04 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 2 7 14 16 5 4 4 4 11 34 83 124 129 85 21 0 555 (1) 2.16 .36 1.26 2.52 2.88 .90 .72 .72 .72 1.98 6.13 14.95 22.34 23.24 15.32 3.78 .00 100.00 (2) .15 .02 .08 .17 .19 .06 .05 .05 .05 .13 .41 1.01 1.50 1.56 1.03 .25 .00 6.73 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 FT WIND DATA STABILITY CLASS G CLASS FREQUENCY (PERCENT) = 5.83 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 1 1 0 0 0 0 0 3 (1) .00 .00 .21 .00 .00 .00 .00 .00 .00 .00 .21 .21 .00 .00 .00 .00 .00 .62 (2) .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .01 .01 .00 .00 .00 .00 .00 .04 C-3 8 2 7 4 6 1 0 0 2 3 13 48 114 ill 39 12 0 370 (1) 1.66 .42 1.46 .83 1.25 .21 .00 .00 .42 .62 2.70 9.98 23.70 23.08 8.11 2.49 .00 76.92 (2) .10 .02 .08 .05 .07 .01 .00 .00 .02 .04 .16 .58 1.38 1.35 .47 .15 .00 4.48 4-7 0 0 0 1 0 0 0 0 0 0 6 10 18 44 27 1 0 107 (1) .00 .00 .00 .21 .00 .00 .00 .00 .00 .00 1.25 2.08 3.74 9.15 5.61 .21 .00 22.25 (2) .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .07 .12 .22 .53 .33 .01 .00 1.30 8-12 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 (1) .00 .00 .00 .00 .21 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .21 (2) .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 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 8 2 8 5 7 1 0 0 2 3 20 59 132 155 66 13 0 481 (1) 1.66 .42 1.66 1.04 1.46 .21 .00 .00 .42 .62 4.16 12.27 27.44 32.22 13.72 2.70 .00 100.00 (2) .10 .02 .10 .06 .08 .01 .00 .00 .02 .04 .24 .72 1.60 1.88 .80 .16 .00 5.83 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 43.0 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 1 2 2 0 1 0 0 1 0 0 1 1 0 2 1 2 0 14 (1) .01 .02 .02 .00 .01 .00 .00 .01 .00 .00 .01 .01 .00 .02 .01 .02 .00 .17 (2) .01 .02 .02 .00 .01 .00 .00 .01 .00 .00 .01 .01 .00 .02 .01 .02 .00 .17 C-3 69 48 49 77 45 40 21 22 44 50 88 146 280 279 167 83 0 1508 (1) .84 .58 .59 .93 .55 .48 .25 .27 .53 .61 1.07 1.77 3.39 3.38 2.02 1.01 .00 18.28 (2) .84 .58 .59 .93 .55 .48 .25 .27 .53 .61 1.07 1.77 3.39 3.38 2.02 1.01 .00 18.28 4-7 145 78 85 123 156 88 103 89 109 148 247 462 474 463 357 183 0 3310 (1) 1.76 .95 1.03 1.49 1.89 1.07 1.25 1.08 1.32 1.79 2.99 5.60 5.74 5.61 4.33 2.22 .00 40.12 (2) 1.76 .95 1.03 1.49 1.89 1.07 1.25 1.08 1.32 1.79 2.99 5.60 5.74 5.61 4.33 2.22 .00 40.12 8-12 60 49 98 125 149 104 101 79 37 103 265 364 275 367 264 68 0 2508 (1) .73 .59 1.19 1.51 1.81 1.26 1.22 .96 .45 1.25 3.21 4.41 3.33 4.45 3.20 .82 .00 30.40 (2) .73 .59 1.19 1.51 1.81 1.26 1.22 .96 .45 1.25 3.21 4.41 3.33 4.45 3.20 .82 .00 30.40 13-18 10 8 48 28 23 27 4 2 1 14 63 41 75 189 216 14 0 763 (1) .12 .10 .58 .34 .28 .33 .05 .02 .01 .17 .76 .50 .91 2.29 2.62 .17 .00 9.25 (2) .12 .10 .58 .34 .28 .33 .05 .02 .01 .17 .76 .50 .91 2.29 2.62 .17 .00 9.25 19-24 0 1 20 8 17 6 0 0 1 0 4 0 4 26 38 2 0 127 (1) .00 .01 .24 .10 .21 .07 .00 .00 .01 .00 .05 .00 .05 .32 .46 .02 .00 1.54 (2) .00 .01 .24 .10 .21 .07 .00 .00 .01 .00 .05 .00 .05 .32 .46 .02 .00 1.54 GT 24 0 0 1 0 18 1 0 0 0 0 0 0 0 1 0 0 0 21 (1) .00 .00 .01 .00 .22 .01 .00 .00 .00 -. 00 .00 .00 .00 .01 .00 .00 .00 .25 (2) .00 .00 .01 .00 .22 .01 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .25 ALL SPEEDS 285 186 303 361 409 266 229 193 192 315 668 1014 1108 1327 1043 352 0 8251 (1) 3.45 2.25 3.67 4.38 4.96 3.22 2.78 2.34 2.33 3.82 8.10 12.29 13.43 16.08 12.64 4.27 .00 100.00 (2) 3.45 2.25 3.67 4.38 4.96 3.22 2.78 2.34 2.33 3.82 8.10 12.29 13.43 16.08 12.64 4.27 .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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS A CLASS FREQUENCY (PERCENT) = 2.01 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 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 1 0 3 0 0 .0 0 0 0 0 0 0 0 4 (1) .00 .00 .00 .00 .61 .00 1.82 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 2.42 (2) .00 .00 .00 .00 .01 .00 .04 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .05 8-12 0 0 0 0 8 2 28 6 0 2 1 5 4 2 2 0 0 60 (1) .00 .00 .00 .00 4.85 1.21 16.97 3.64 .00 1.21 .61 3.03 2.42 1.21 1.21 .00 .00 36.36 (2) .00 .00 .00 .00 .10 .02 .34 .07 .00 .02 .01 .06 .05 .02 .02 .00 .00 .73 13-18 0 1 2 1 2 1 12 12 1 3 9 16 5 11 2 0 0 78 (1) .00 .61 1.21 .61 1.21 .61 7.27 7.27 .61 1.82 5.45 9.70 3.03 6.67 1.21 .00 .00 47.27 (2) .00 .01 .02 .01 .02 .01 .15 .15 .01 .04 .11 .19 .06 .13 .02 .00 .00 .95 19-24 0 0 0 0 0 0 2 0 1 1 1 3 3 7 4 0 0 22 (1) .00 .00 .00 .00 .00 .00 1.21 .00 .61 .61 .61 1.82 1.82 4.24 2.42 .00 .00 13.33 (2) .00 .00 .00 .00 .00 .00 .02 .00 .01 .01 .01 .04 .04 .09 .05 .00 .00 .27 GT 24 0 0 0 ---0 . 0 0 0 0 0 0 0 1 0 0 0 0 1 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .61 .00 .00 .00 .00 .61 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .01 ALL SPEEDS 0 1 2 1 11 3 45 18 2 6 11 24 13 20 8 0 0 165 (1) .00 .61 1.21 .61 6.67 1.82 27.27 10.91 1.21 3.64 6.67 14.55 7.88 12.12 4.85 .00 .00 100.00 (2) .00 .01 .02 .01 .13 .04 .55 .22 .02 .07 .13 .29 .16 .24 .10 .00 .00 2.01 (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 .95 MPH)

SEABROOK JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS B CLASS FREQUENCY (PERCENT) = 3.58 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 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 2 1 0 0 1 0 4 0 0 0 1 1 3 1 0 0 0 14 (1) .68 .34 .00 .00 .34 .00 1.36 .00 .00 .00 .34 .34 1.02 .34 .00 .00 .00 4.76 (2) .02 .01 .00 .00 .01 .00 .05 .00 .00 .00 .01 .01 .04 .01 .00 .00 .00 .17 8-12 3 1 2 8 21 10 16 4 2 6 10 12 6 12 4 3 0 120 (1) 1.02 .34 .68 2.72 7.14 3.40 5.44 1.36 .68 2.04 3.40 4.08 2.04 4.08 1.36 1.02 .00 40.82 (2) .04 .01 .02 .10 .26 .12 .19 .05 .02 .07 .12 .15 .07 .15 .05 .04 .00 1.46 13-18 0 1 3 5 6 2 6 9 0 3 16 24 10 21 13 1 0 120 (1) .00 .34 1.02 1.70 2.04 .68 2.04 3.06 .00 1.02 5.44 8.16 3.40 7.14 4.42 .34 .00 40.82 (2) .00 .01 .04 .06 .07 .02 .07 .11 .00 .04 .19 .29 .12 .26 .16 .01 .00 1.46 19-24 0 0 0 1 0 0 1 0 0 0 3 3 3 9 9 2 0 31 (1) .00 .00 .00 .34 .00 .00 .34 .00 .00 .00 1.02 1.02 1.02 3.06 3.06 .68 .00 10.54

.(2) .00 .00 .00 .01 .00 .00 .01 .00 .00 .00 .04 .04 .04 .11 .11 .02 .00 .38 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 1 3 5 0 0 9 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .34 1.02 1.70 .00 .00 3.06 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .04 .06 .00 .00 .11 ALL SPEEDS 5 3 5 14 28 12 27 13 2 9 30 40 23 46 31 6 0 294 (1) 1.70 1.02 1.70 4.76 9.52 4.08 9.18 4.42 .68 3.06 10.20 13.61 7.82 15.65 10.54 2.04 .00 100.00 (2) .06 .04 .06 .17 .34 .15 .33 .16 .02 .11 .37 .49 .28 .56 .38 .07 .00 3.58 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS C CLASS FREQUENCY (PERCENT) = 6.58 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 0 0 0 0 0 1 0 1 0 0 0 0 4 (1) .00 .18 .00 .00 .18 .00 .00 .00 .00 .00 .18 .00 .18 .00 .00 .00 .00 .74 (2) .00 .01 .00 .00 .01 .00 .00 .00 .00 .00 .01 .00 .01 .00 .00 .00 .00 .05 4-7 2 0 1 3 9 3 11 1 1 2 6 6 12 7 5 2 0 71 (1) .37 .00 .18 .55 1.66 .55 2.03 .18 .18 .37 1.11 1.11 2.22 1.29 .92 .37 .00 13.12 (2) .02 .00 .01 .04 .11 .04 .13 .01 .01 .02 .07 .07 .15 .09 .06 .02 .00 .86 8-12 6 1 2 10 24 18 28 8 2 4 13 20 23 16 11 7 0 193 (1) 1.11 .18 .37 1.85 4.44 3.33 5.18 1.48 .37 .74 2.40 3.70 4.25 2.96 2.03 1.29 .00 35.67 (2) .07 .01 .02 .12 .29 .22 .34 .10 .02 .05 .16 .24 .28 .19 .13 .09 .00 2.35 13-18 1 3 3 9 2 1 2 8 1 4 11 26 30 51 25 3 0 180 (1) .18 .55 .55 1.66 .37 .18 .37 1.48 .18 .74 2.03 4.81 5.55 9.43 4.62 .55 .00 33.27 (2) .01 .04 .04 .11 .02 .01 .02 .10 .01 .05 .13 .32 .37 .62 .30 .04 .00 2.19 19-24 0 0 0 0 0 0 1 0 0 0 1 1 15 19 28 2 0 67 (1) .00 .00 .00 .00 .00 .00 .18 .00 .00 .00 .18 .18 2.77 3.51 5.18 .37 .00 12.38 (2) .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .01 .01 .18 .23 .34 .02 .00 .82 GT 24 0 0 0 0 0 1 0 0 0 0 0 0 3 10 11 1 0 26 (1) .00 .00 .00 .00 .00 .18 .00 .00 .00 .00 .00 .00 .55 1.85 2.03 .18 .00 4.81 (2) .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .04 .12 .13 .01 .00 .32 ALL SPEEDS 9 5 6 22 36 23 42 17 4 10 32 53 84 103 80 15 0 541 (1) 1.66 .92 1.11 4.07 6.65 4.25 7.76 3.14 .74 1.85 5.91 9.80 15.53 19.04 14.79 2.77 .00 100.00 (2) .11 .06 .07 .27 .44 .28 .51 .21 .05 .12 .39 .64 1.02 1.25 .97 .18 .00 6.58 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS D CLASS FREQUENCY (PERCENT) = 50.52 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 14 6 13 17 5 6 8 7 7 11 9 10 18 15 14 11 0 171 (1) .34 .14 .31 .41 .12 .14 .19 .17 .17 .26 .22 .24 .43 .36 .34 .26 .00 4.12 (2) .17 .07 .16 .21 .06 .07 .10 .09 .09 .13 .11 .12 .22 .18 .17 .13 .00 2.08 4-7 72 52 51 56 57 63 39 30 37 38 46 47 54 83 69 68 0 862 (1). 1.73 1.25 1.23 1.35 1.37 1.52 .94 .72 .89 .92 1.11 1.13 1.30 2.00 1.66 1.64 .00 20.76 (2) .88 .63 .62 .68 .69 .77 .47 .37 .45 .46 .56 .57 .66 1.01 .84 .83 .00 10.49 8-12 85 56 63 75 65 61 47 53 55 95 103 98 113 156 131 87 0 1343 (1) 2.05 1.35 1.52 1.81 1.57 1.47 1.13 1.28 1.32 2.29 2.48 2.36 2.72 3.76 3.16 2.10 .00 32.35 (2) 1.03 .68 .77 .91 .79 .74 .57 .64 .67 1.16 1.25 1.19 1.38 1.90 1.59 1.06 .00 16.34 13-18 42 49 77 34 22 14 9 23 20 44 125 130 136 240 188 26 0 1179 (1) 1.01 1.18 1.85 .82 .53 .34 .22 .55 .48 1.06 3.01 3.13 3.28 5.78 4.53 .63 .00 28.40 (2) .51 .60 .94 .41 .27 .17 .11 .28 .24 .54 1.52 1.58 1.65 2.92 2.29 .32 .00 14.35 19-24 20 21 28 9 10 17 5 2 0 9 27 10 74 109 99 9 0 449 (1) .48 .51 .67 .22 .24 .41 .12 .05 .00 .22 .65 .24 1.78 2.63 2.38 .22 .00 10.81 (2) .24 .26 .34 .11 .12 .21 .06 .02 .00 .11 .33 .12 .90 1.33 1.20 .11 .00 5.46 GT 24 0 7 15 4 25 4 0 0 0 0 4 0 19 35 32 3 0 148 (1) .00 .17 .36 .10 .60 .10 .00 .00 .00 .00 .10 .00 .46 .84 .77 .07 .00 3.56 (2) .00 .09 .18 .05 .30 .05 .00 .00 .00 .00 .05 .00 .23 .43 .39 .04 .00 1.80 ALL SPEEDS 233 191 247 195 184 165 108 115 119 197 314 295 414 638 533 204 0 4152 (1) 5.61 4.60 5.95 4.70 4.43 3;97 2.60 2.77 2.87 4.74 7.56 7.11 9.97 15.37 12.84 4.91 .00 100.00 (2) 2.84 2.32 3.01 2.37 2.24 2.01 1.31 1.40 1.45 2.40 3.82 3.59 5.04 7.76 6.49 2.48 .00 50.52 f1)=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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS E CLASS FREQUENCY (PERCENT) = 24.70 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 1 0 0 0 0 0 0 0 0 0 0 0 0 1 (1) .00 .00 .00 .00 .05 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .05 (2) .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00. .01 C-3 1 2 5 5 3 6 3 4 8 2 5 3 3 4 1 2 0 57 (1) .05 .10 .25 .25 .15 .30 .15 .20 .39 .10 .25 .15 .15 .20 .05 .10 .00 2.81 (2) .01 .02 .06 .06 .04 .07 .04 .05 .10 .02 .06 .04 .04 .05 .01 .02 .00 .69 4-7 25 24 18 20 11 13 32 22 14 17 24 19 20 14 28 27 0 328 (1) 1.23 1.18 .89 .99 .54 .64 1.58 1.08 .69 .84 1.18 .94 .99 .69 1.38 1.33 .00 16.16 (2) .30 .29 .22 .24 .13 .16 .39 .27 .17 .21 .29 .23 .24 .17 .34 .33 .00 3.99 8-12 44 23 15 4 8 14 17 20 46 68 108 158 97 125 109 59 0 915 (1) 2.17 1.13 .74 .20 .39 .69 .84 .99 2.27 3.35 5.32 7.78 4.78 6.16 5.37 2.91 .00 45.07 (2) .54 .28 .18 .05 .10 .17 .21 .24 .56 .83 1.31 1.92 1.18 1.52 1.33 .72 .00 11.13 13-18 9 3 1 6 3 3 3 26 9 29 96 159 99 155 50 7 0 658 (1) .44 .15 .05 .30 .15 .15 .15 1.28 .44 1.43 4.73 7.83 4.88 7.64 2.46 .34 .00 32.41 (2) .11 .04 .01 .07 .04 .04 .04 .32 .11 .35 1.17 1.93 1.20 1.89 .61 .09 .00 8.01 19-24 0 1 0 2 3 5 1 3 2 1 10 2 4 9 1 0 0 44 (1) .00 .05 .00 .10 .15 .25 .05 .15 .10 .05 .49 .10 .20 .44 .05 .00 .00 2.17 (2) .00 .01 .00 .02 .04 .06 .01 .04 .02 .01 .12 .02 .05 .11 .01 .00 .00 .54 GT 24 0 0 6 10 7 1 0 0 1 0 0 0 0 2 0 0 0 27 (1) .00 .00 .30 .49 .34 .05 .00 .00 .05 .00 .00 .00 .00 .10 .00 .00 .00 1.33 (2) .00 .00 .07 .12 .09 .01 .00 .00 .01 .00 .00 .00 .00 .02 .00 .00 .00 .33 ALL SPEEDS 79 53 45 47 36 42 56 75 80 117 243 341 223 309 189 95 0 24030 (1) 3.89 2.61 2.22 2.32 1.77 2.07 2.76 3.69 3.94 5.76 11.97 16.80 10.99 15.22 9.31 4.68 .00 200.00 (2) .96 .64 .55 .57 .44 .51 .68 .91 .97 1.42 2.96 4.15 2.71 3,76 2.30 1.16 .00 24.70 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS F CLASS FREQUENCY (PERCENT) = 6.75 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 1 0 0 0 0 0 0 0 1 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .18 .00 .00 .00 .00 .00 .00 .00 .18 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .01 C-3 0 0 3 2 0 1 1 1 5 2 5 2 1 2 2 2 0 29 (1) .00 .00 .54 .36 .00 .18 .18 .18 .90 .36 .90 .36 .18 .36 .36 .36 .00 5.23 (2) .00 .00 .04 .02 .00 .01 .01 .01 .06 .02 .06 .02 .01 .02 .02 .02 .00 .35 4-7 13 8 3 5 4 2 4 2 10 8 21 7 11 9 11 6 0 124 (1) 2.34 1.44 .54 .90 .72 .36 .72 .36 1.80 1.44 3.78 1.26 1.98 1.62 1.98 1.08 .00 22.34 (2) .16 .10 .04 .06 .05 .02 .05 .02 .12 .10 .26 .09 .13 .11 .13 .07 .00 1.51 8-12 14 6 5 1 1 1 1 5 12 17 17 38 46 46 35 25 0 270 (1) 2.52 1.08 .90 .18 .18 .18 .18 .90 2.16 3.06 3.06 6.85 8.29 8.29 6.31 4.50 .00 48.65 (2) .17 .07 .06 .01 .01 .01 .01 .06 .15 .21 .21 .46 .56 .56 .43 .30 .00 3.29 13-18 3 1 0 0 0 0 0 1 0 2 11 16 27 34 29 7 0 131 (1) .54 .18 .00 .00 .00 .00 .00 .18 .00 .36 1.98 2.88 4.86 6.13 5.23 1.26 .00 23.60 (2) .04 .01 .00 .00 .00 .00 .00 .01 .00 .02 .13 .19 .33 .41 .35 .09 .00 1.59 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 30 15 11 8 5 4 6 9 27 30 54 63 85 91 77 40 0 555 (1) 5.41 2.70 1.98 1.44 .90 .72 1.08 1.62 4.86 5.41 9.73 11.35 15.32 16.40 13.87 7.21 .00 200.00 (2) .37 .18 .13 .10 .06 .05 .07 .11 .33 .37 .66 .77 1.03 1.11 .94 .49 .00 6.75 (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 JAN07-DEC07 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER) 209.0 FT WIND DATA STABILITY CLASS G CLASS FREQUENCY (PERCENT) = 5.85 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 1 3 4 1 2 0 0 1 3 5 2 3 1 2 4 1 0 33 (1) .21 .62 .83 .21 .42 .00 .00 .21 .62 1.04 .42 .62 .21 .42 .83 .21 .00 6.86 (2) .01 .04 .05 .01 .02 .00 .00 .01 .04 .06 .02 .04 .01 .02 .05 .01 .00 .40 4-7 7 15 6 2 2 6 6 2 15 16 15 16 16 12 7 14 0 157 (1) 1.46 3.12 1.25 .42 .42 1.25 1.25 .42 3.12 3.33 3.12 3.33 3.33 2.49 1.46 2.91 .00 32.64 (2) .09 .18 .07 .02 .02 .07 .07 .02 .18 .19 .18 .19 .19 .15 .09 .17 .00 1.91 8-12 24 5 4 0 0 0 1 6 11 18 17 37 27 30 25 28 0 233 (1) 4.99 1.04 .83 .00 .00 .00 .21 1.25 2.29 3.74 3.53 7.69 5.61 6.24 5.20 5.82 .00 48.44 (2) .29 .06 .05 .00 .00 .00 .01 .07 .13 .22 .21 .45 .33 .37 .30 .34 .00 2.84 13-18 5 2 1 0 0 0 0 0 0 1 3 5 5 12 15 9 0 58 (1) 1.04 .42 .21 .00 .00 .00 .00 .00 .00 .21 .62 1.04 1.04 2.49 3.12 1.87 .00 12.06 (2) .06 .02 .01 .00 .00 .00 .00 .00 .00 .01 .04 .06 .06 .15 .18 .11 .00 .71 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 37 25 15 3 4 6 7 9 29 40 37 61 49 56 51 52 0 481 (1) 7.69 5.20 3.12 .62 .83 1.25 1.46 1.87 6.03 8.32 7.69 12.68 10.19 11.64 10.60 10.81 .00 100.00 (2) .45 .30 .18 .04 .05 .07 .09 .11 .35 .49 .45 .74 .60 .68 .62 .63 .00 5.85 (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 JANO7-DEC07 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 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 2 (1) .00 .00 .00 .00 .01 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .02 (2) .00 .00 .00 .00 .01 .00 .00 .00 .00 .01 .00 .00 .00 .00' .00 .00 .00 .02 C-3 16 12 25 25 11 13 12 13 23 20 22 18 24 23 21 16 0 294 (1) .19 .15 .30 .30 .13 .16 .15 .16 .28 .24 .27 .22 .29 .28 .26 .19 .00 3.58 (2) .19 .15 .30 .30 .13 .16 .15 .16 .28, .24 .27 .22 .29 .28 .26 .19 .00 3.58 4-7 121 100 79 86 85 87 99 57 77 81 113 96 116 126 120 117 0 1560 (1) 1.47 1.22 .96 1.05 1.03 1.06 1.20 .69 .94 .99 1.38 1.17 1.41 1.53 1.46 1.42 .00 18.98 (2) 1.47 1.22 .96 1.05 1.03 1.06 1.20 .69 .94 .99 1.38 1.17 1.41 1.53 1.46 1.42 .00 18.98 6-12 176 92 91 98 127 106 138 102 128 210 269 368 316 387 317 209 0 3134 (1) 2.14 1.12 1.11 1.19 1.55 1.29 1.68 1.24 1.56 2.56 3.27 4.48 3.85 4.71 3.86 2.54 .00 38.14 (2) 2.14 1.12 1.11 1.19 1.55 1.29 1.68 1.24 1.56 2.56 3.27 4.48 3.85 4.71 3.86 2.54 .00 38.14 13-18 60 60 87 55 35 21 32 79 31 86 271 376 312 524 322 53 0 2404 (1) .73 .73 1.06 .67 .43 .26 .39 .96 .38 1.05 3.30 4.58 3.80 6.38 3.92 .64 .00 29.25 (2) .73 .73 1.06 .67 .43 .26 .39 .96 .38 1.05 3.30 4.58 3.80 6.38 3.92 .64 .00 29.25 19-24 20 22 28 12 13 22 10 5 3 11 42 19 99 153 141 13 0 613 (1) .24 .27 .34 .15 .16 .27 .12 .06 .04 .13 .51 .23 1.20 1.86 1.72 .16 .00 7.46 (2) .24 .27 .34 .15 .16 .27 .12 .06 .04 .13 .51 .23 1.20 1.86 1.72 .16 .00 7.46 GT 24 0 7 21 14 32 6 0 0 1 0 4 0 24 50 48. 4 0 211 (1) .00 .09 .26 .17 .39 .07 .00 .00 .01 .00 .05 .00 .29 .61 .58 .05 .00 2.57 (2) .00 .09 .26 .17 .39 .07 .00 .00 .01 .00 .05 .00 .29 .61 .58 .05 .00 2.57 ALL SPEEDS 393 293 331 290 304 255 291 256 263 409 721 877 891 1263 969 412 0 8218 (1) 4.78 3.57 4.03 3.53 3.70 3.10 3.54 3.12 3.20 4.98 8.77 10.67 10.84 15.37 11.79 5.01 .00 100.00

.(2) 4.78 3.57 4.03 3.53 3.70 3.10 3.54 3.12 3.20 4.98 8.77 10.67 10.84 15.37 11.79 5.01 .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 STATION JAN - DEC 2007 209-FOOT WIND DATA N

W E S

STABILITY CLASS ALL CALM WINDS 0.02% WIND SPEED (MPH) 0-=

NOTE: Frequencies indicate

/ direction from which the wind is blowing.

C-3 4-7 8-12 .13-18 19-24 GT24

SEABROOK STATION JAN - DEC 2007 43-FOOT WIND DATA N

W E S

STABILITY CLASS ALL CALM WINDS 0.17% WIND SPEED (MPH) 0--=

NOTE: Frequencies indicate direction from which the wind is blowing.

C-3 4-7 8-12 13-18 19-24 GT 24

ENCLOSURE 3 TO SBK-L-08073 Radiation Dose Assessment

Seabrook Station Radiological Effluent Impact Assessment For 2007 (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. 1I 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 (IOCFR5O, Total Body 1.5 mrem 3 mrem APP. I) Max. Organ 5 mrem 10 mrem NOBLE GAS Gamma Air 5 mrad 10 mrad (I0CFR50, APP. I) Beta Air 10 mrad 20 mrad GAS PARTICULATE (10CFR50, APP. I) Max. Organ 7.5 mrem 15 mrem TOTAL DOSE Total Body & organ 25 mrem (40CFRI90)

[liquids, gas, direct] Thyroid 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 2007 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 AREVA Doc.# 47-9078521-000

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 2007 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.

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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 1 degree or 40 to 1 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,/,)

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.

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mI. 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/Q'] (Reference 6) and the replacement of the undepleted X/Q in the infinite cloud dose equation by [X/QT ].

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, DF1 I and DFiO, 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 2007 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 10CFR50, 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 1.89E-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 1.98E-02 mrem.

Table B illustrates the total dose projections from all station sources to the maximum potential off-site individual for the year 2007 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 2007 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 2007 Liquid Effluents:

Total Body Dose 1.19E-04 8.67E-05 2.75E-05 8.27E-05 3.16E-04 (1) (1) (1) (2)

Organ Dose 6.33E-04 3.45E-04 1.40E-04 1.36E-04 1.25E-03 (3) (3) (3) (4)

Airborne Effluents:

Organ Dose from lodines, 4.30E-03 9.85E-03 1.81E-03 2.56E'03 1.85E-02 Tritium, and Particulates (5) (6) (7) (8)

Noble Gases Beta Air 8.05E-06 1.10E-06 1.24E-06 1.32E-05 2.36E-05 (mrad) (9) (10) (11) (12)

GammaAir 1.42E-05 2.41E-06 2.60E-06 2.31E-05 4.23E-05 (mrad) (9) (10) (11) (12)

Direct Dose Offsite From 0 Plant Operation(e)

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

Science and Nature Center (SW, 488m): 1.78E-06 7.55E-06 6.19E-07 2.94E-07 1.02E-05 Organ Dose (mrem) (dl) (dl) (dl) (dl)

The "Rocks" (NE/ENE, 244m): 2.45E-04 1.75E-04 9.35E-05 1.09E-04 6.23E-04 Organ Dose (mrem) (dl) (dl) (dl) (dl) 8

Table A (continued)

Seabrook Station 2007 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) Child (2) Adult (3) Bone of a child.

(4) GI-LLI of an adult.

(5) Liver, kidney, lung, GI-LLI, thyroid, and whole body of a Child, ENE 2313 m.

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

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

(8) Liver, kidney, lung, GI-LLI, thyroid, and whole body of a Child, S 1212 m.

(9) ENE2276m.

(10) W 974m (11) NW 914m (12) N 914 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 2007 actual occupancy factors were much lower for the "Rocks" (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:

(d 1) Liver, kidney, lung, GI-LLI, thyroid, and whole body of a teen.

(e) Only station sources are considered since there are no other facilities within five miles of Seabrook Station. 2007 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 preoperation data from 1986-1988 for the same locations. No statistical difference, which could be attributed to station sources, was identified.

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Table B Seabrook Station 2007 Annual Radioactive Effluent Release Report Total Dose to Maximum Off-Site Individual (40CFR190)

Release Source Total Body (mrem)

] Maximum Organ(a)

(mrem)

Liquids 3.16E-04 1.25E-03 Noble Gases 2.81E-05 2.81E-05 Gas lodines, Tritium & 1.85E-02 1.85E-02 Particulates Direct Radiation 0 0 Annual Total 1.89E-02 1.98E-02 (a) Maximum organ includes consideration. of the thyroid.

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Table C Seabrook Station 2007 Annual Radioactive Effluent Release Report Calculated 2007 Maximum Doses Versus Applicable Limits Applicable ODCM Calculated Percent ODCM Annual Annual (2007) of Receptor Control Limit Dose Limit Offsite Liquid Effluents Whole Body Dose C.6.2.1 3 mrem 3.16E-04 mrem 0.011%

Organ Dose C.6.2.1 10 mrem 1.25E-03 mrem 0.013%

Airborne Effluents Organ Dose (iodines, tritium, and part.) C.7.3.1 15 mrem 1.85E-02 mrem 0.123%

Gamma Air Dose (noble gases) C.7.2.1 10 mrad 4.23E-05 mrad 0.0004%

Beta Air Dose (noble gases) C.7.2.1 20 mrad 2.36E-05 mrad 0.00012%

All Plant Sources (a)

Whole Body Dose C.8.1.1 25 mrem 1.89E-02 mrem 0.08%

Organ Dose C.8.1.1 25 mrem 1.98E-02 mrem 0.08%

Onsite (Science and Nature Center, 488m SW)

Airborne Effluents Organ Dose (iodines, tritium, and part.) C. 7 .3 .1(b) 15 rnrem 1.02E-05 mrem 0.00007%

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

Airborne Effluents Organ Dose (iodines, tritium, and part.) C. 7 .3 .1(b) 15 mrem 6.23E-04 mrem 0.0042%

(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 limit (C.7.3.1) is the acceptable dose from gaseous effluents (no significant liquid pathways) to areas at and beyond the site boundary and is considered to be appropriate for comparison purposes.

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Table D Seabrook Station 2007 Annual Radioactive Effluent Release Report Sources of the Values of Factors Used in Liquid Dose Equations Factor Definition J Source Uap Usage factor Table B.7-1, Station ODCM MP Mixing ratio Section B.7.1, Station ODCM (value=0.1 for aquatic foods and 0.025 for shoreline)

Bip Equilibrium bioaccumulation factor Table A-i, Reg. Guide 1.109 Daipj Dose factor Tables E- 11 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 Table A-2, Reg. Guide 1.109 (value=0.5) 12

Table E Seabrook Station 2007 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 ki Nuclide decay constant Kocher (Reference 3)

DFGIj 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 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 r Fraction of deposited activity Table E- 15, Reg. Guide 1.109 retained on crops, leafy vegetables, or pasture grass Stable element transfer coefficient Table E-i, 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 2007 Annual Radioactive Effluent Release Report Sources of Values for the Factors Used in Dose Ecuations 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 f 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-11 through E-14, R.G.1.109 Annual intake of produce Table B.7-3, Station ODCM Um Annual intake of milk Table B.7-3, Station ODCM a Annual intake of milk Table B.7-3, Station ODCM Ua' Annual intake of meat Table B.7-3, Station ODCM L

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 f, leafy vegetables Rate constant for activity removal Table E- 15, Reg. Guide 1.109 X"w from plant and leaf surfaces by weathering QF Animal consumption rate Table E-3, Reg. Guide 1.109 14

Table F Seabrook Station 2007 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 2.20 (3.55) 2.47 (3.97) ---

NNE 1.89(3.04) 1.89(3.04)

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 0.76 (1.22) 0.79 (1.27) 4.30 (6.93)

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

  • Locations based on 2007 Land Use Census.

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