ML12123A039

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Submittal of 2011 Annual Radioactive Effluent Release Report
ML12123A039
Person / Time
Site: Seabrook NextEra Energy icon.png
Issue date: 04/26/2012
From: O'Keefe M
NextEra Energy Seabrook
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
SBK-L-12097
Download: ML12123A039 (58)
v • d • e


Text

NExTera April 26, 2012 Docket No. 50-443 SBK-L-12097 U.S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, DC 20555-0001 Seabrook Station 2011 Annual Radioactive Effluent Release Report Pursuant to 1OCFR 50.36a (a).2 and Technical Specification 6.8.1.4, NextEra Energy Seabrook, LLC submits the Annual Radioactive Effluent Release Report for 2011. 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 Enclosure 2 Enclosure 3 Enclosure 4 Effluent release data as required by Regulatory Guide 1.21 Joint frequency distributions of wind speed, wind direction, and atmospheric stability Radiation dose assessment Offsite Dose Calculation Manual (ODCM), Revision 36 Should you have any questions regarding this letter, please contact David Robinson, Chemistry Department Manager, at (603) 773-7496.Sincerely, NextEra Energy Seabrook, LLC Michel O'Keefe Licensing Manager NextEra Energy Seabrook, LLC, P.O. Box 300, Lafayette Road, Seabrook, NH 03874 U.S. Nuclear Regulatory Commission SBK-L-12097/

Page 2 cc: NRC Region I Administrator J. G. Lamb, NRC Project Manager, Project Directorate 1-2 W.J. Raymond, NRC Senior Resident Inspector Seth Breitmaier, American Nuclear Insurers Enclosure 1 Effluent Release Data as Required by Regulatory Guide 1.21 EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT Supplemental Information 2011 Facility:

Seabrook Station Unit 1 Licensee:

NextEra 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. 2.0 E-04 pCi/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. Iodines: 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:

108 b. Total time for batch releases:

21102 minutes c. Maximum time period for batch release: 791 minutes d. Average time period for batch release: 196 minutes e. Minimum time period for batch release: 14minutes f. Average stream flow during periods of release of effluents into a flowing stream: 1.51 E+06 liters per minute B. Gaseous a. Number of batch releases:

80 b. Total time for batch releases:

137995 minutes c. Maximum time period for batch release: 11944 minutes d. Average time period for batch release: 1725 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 2011 GASEOUS EFFLUENTS-SUMMATION OF ALL RELEASES Unt Ourte QureOure uarter Est. Total 1 Quar Quarter rror,%A. Fission and activation gases 1. Total releases Ci 3.97E-01 2.60E-01 6.63E-04 2.59E-01 1.70E+01 2. Average release rate uCi/sec for period 5.11E-02 3.31 E-02 8.34E-05 3.26E-02 3. Percent of applicable Technical Specification

%limit 1.99E-02 1.19E-02 6.24E-05 1.13E-02 B. lodines (Note 1)1. Total release Ci 1.28E-06 3.76E-05 ND ND 1.50E+01 2. Average release rate uCi/sec for period 1.62E-07 4.77E-06 N/A N/A 3. Percent of applicable Technical Specification

%limit 1.99E-01 7.68E-01 N/A N/A C. Particulates

1. Total release Ci ND 8.01E-08 ND ND 1.80E+01 2. Average release rate uCi/sec for period NIA 1.02E-08 N/A N/A 3. Percent of applicable Technical Specification

%limit N/A 7.68E-01 N/A N/A 4. Total alpha radioactivity Ci ND ND ND ND D. Tritium 1. Total release Ci 1.30E+01 3.75E+01 2.43E+01 3.29E+01 1.60E+01 2. Average release rate for period uCi/sec 1.67E+00 4.77E+00 3.06E+00 4.14E+00 3. Percent of applicable Technical Specification

%limit I I 1.99E-01 7.68E-01 3.25E-01 1.56E+00 Note 1: The detection of Iodine appears coincidental with the Fukushima-Daichii incident from environmental air being taken in and released through ventilation systems and are not due to Seabrook plant operations.

TABLE 1B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2011 GASEOUS EFFLUENTS-ELEVATED RELEASES BATCH Nuclides Released [Unit Quarter Quarter Quarter Quarter NuIie Reeae Uni 1 2 3 4 1. Fission and activation gases argon-41 Ci 3.13E-01 2.57E-01 6.63E-04 2.27E-01 krypton-85 Ci ND ND ND ND krypton-85m Ci 3.77E-03 ND ND 7.13E-04 krypton-87 Ci 3.55E-03 ND ND 5.20E-04 krypton-88 Ci 7.13E-03 1,86E-03 ND 1.55E-03 xenon-131m Ci ND ND ND ND xenon-133 Ci 2.50E-02 ND ND 1.57E-02 xenon-133m Ci ND ND ND ND xenon-135 Ci 4.44E-02 1.41E-03 ND 1.23E-02 xenon-135m Ci ND ND ND 1.14E-03 xenon-138 Ci ND ND ND ND Ci unidentified Ci ND ND ND ND Total for period Ci 3,97E-01 2.60E-01 6.63E-04 2.59E-01 2. Iodines iodine-131 Ci ND ND ND ND iodine-133 Ci ND ND ND ND iodine-1 35 Ci ND ND ND ND Total for period Ci 0.OOE+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 0.00E+00 0.OOE+00 0.OOE+00 TABLE 1B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2011 GASEOUS EFFLUENTS-ELEVATED RELEASES CONTINUOUS i R Quarter Quarter Quarter Quarter Nuclides Released Unit 1 2 3 4 1. Fission and activation gases argon-41 Ci 5.11E-03 1.46E-03 2.35E-03 4.05E-03 krypton-85 Ci ND ND ND ND krypton-85m Ci ND ND ND 2.57E-04 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 5.14E-04 ND 1.52E-04 3.53E-04 xenon-135m Ci ND ND ND ND xenon-1 38 Ci ND ND ND ND Ci Ci unidentified Ci ND ND ND ND Total for period Ci 5.62E-03 1.46E-03 2.50E-03 4.66E-03 2. Iodines (Note 1)iodine-131 Ci 1.16E-06 3.72E-05 ND ND iodine-1 33 Ci ND ND ND ND iodine-135 Ci ND ND ND ND Total for period Ci 1.16E-06 3.72E-05 O.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 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 carbon-14 Ci 7.59E-01 2.20E+00 3.52E+00 3.35E+00 unidentified Ci ND ND ND ND Total for period Ci 7.59E-01 2.20E+00 3.52E+00 3.35E+00 Note 1: The detection of Iodine appears coincidental with the Fukushima-Daichii incident from environmental air being taken in and released through ventilation systems and are not due to Seabrook plant operations.

TABLE IC EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2011 GASEOUS EFFLUENTS-GROUND LEVEL RELEASES BATCH Nuclides Released Unit Quarter Quarter Quarter Quarter NuIie Reeae Uni 1 2 3 4 1. Fission and activation gases argon-41 Ci 2.80E-05 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-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 ND ND xenon-138 Ci ND ND ND. ND Ci Ci unidentified Ci ND ND ND ND Total for period Ci 2.80E-05 0.OOE+00 0.OOE+00 0.OOE+00 2. Iodines iodine-1 31 Ci ND ND ND ND iodine-132 Ci ND ND ND ND iodine-133 Ci ND ND ND ND iodine-135 Ci ND ND ND ND Total for period Ci 0.OOE+00 0.00E+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-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 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 TABLE iC EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2011 GASEOUS EFFLUENTS-GROUND LEVEL RELEASES CONTINUOUS Nuclides Released Unit Quarter Quarter Quarter Quarter Nulie Reeae 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-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 0.OOE+00 0.OOE+00 2. Iodines (Note 1)iodine-1 31 Ci 1.15E-07 3.67E-07 ND ND iodine-133 Ci ND ND ND ND Ci Total for period Ci 1.15E-07 3.67E-07 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-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 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 Note 1: The detection of Iodine appears coincidental with the Fukushima-Daichii incident from environmental air being taken in and released through ventilation systems and are not due to Seabrook plant operations.

TABLE 2A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2011 LIQUID EFFLUENTS-SUMMATION OF ALL RELEASES Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Est. Tota, A. Fission and activation products 1. Total releases Ci 2.52E-03 9.48E-03 1.66E-03 2.86E-03 6.00E+00 2. Average diluted concentration uCi/ml 3.99E-12 2.41E-11 2.97E-12 3.86E-12 durina period 3. Percent of applicable limit % 2.49E-02 1.55E-01 1.08E-03 2.24E-03 B. Tritium 1. Total release Ci 1.15E+03 3.45E+02 3.87E+01 6.81E+01 8.00E+00 2. Average diluted concentration uCi/ml 1.82E-06 8.78E-07 6.92E-08 9.19E-08 durina Deriod 3. Percent of applicable limit % 1.01E-02 9.40E-02 7.68E-04 1.46E-03 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 durina 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 ND 1.OOE+01 TABLE 2B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2011 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 ND ND ND ND iodine-131 Ci ND ND ND ND iodine-133 Ci ND ND ND ND cobalt-57 Ci 8.46E-06 ND 2.78E-06 3.42E-06 cobalt-58 Ci 3.24E-04 3.56E-03 1.32E-03 2.72E-03 cobalt-60 Ci 2.09E-04 7.98E-05 1.84E-05 1.05E-04 chromium-51 Ci ND 1.89E-04 ND ND iron-55 Ci 1.73E-03 1.67E-03 ND ND iron-59 Ci ND 8.57E-06 ND ND zinc-65 Ci ND ND ND ND manganese-54 Ci 1.12E-06 ND ND ND zirconium-niobium-95 Ci ND 6.55E-06 ND ND molybdenum-99 Ci ND ND ND ND technetium-99m Ci ND ND ND ND silver- 1Orn Ci ND ND ND ND barium-lanthanum-140 Ci ND ND ND ND cerium-141 Ci ND ND ND ND antimony-122 Ci ND ND ND ND antimony-124 Ci ND 2.71E-05 ND ND antimony-125 Ci 2.46E-04 9.27E-04 3.17E-04 2.17E-05 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)

T Ci 2.52E-03 6.47E-03 1.66E-03 2.85E-03 xenon-133 Ci ND I ND ND ND xenon-135 Ci ND ND ND ND TABLE 2B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2011 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-1 34 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-57 Ci ND ND ND ND cobalt-58 Ci ND 2.99E-03 ND 2.79E-06 cobalt-60 Ci ND 1.77E-05 ND 7.59E-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 1.86E-08 ND 5.07E-07 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 I Total for period(above)

I Ci I O.OOE+00 I 3.01E-03 I O.OOE+00 I 1.09E-05 I *3.O",-0 I 31Om+OI ND0E-ND I xenon-131m Ci ND ND ND ND xenon-133m Ci ND ND ND ND xenon-133 Ci ND ND ND ND xenon-i135 jCi ND ND ND ND EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2011 SOLID WASTE AND IRRADIATED FUEL SHIPMENTS A. SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL (Not irradiated fuel)1. Type of waste Unit 1 year Est. Total tPeriod Error, %a. Spent resins, filter sludges, evaporator m 3 2.56E+00 Bottoms, etc. Ci 5.74E+01 b. Dry compressible waste, contaminated m 3 1.17E+02 Equip, etc. Ci 2.07E+00 c. Irradiated components, control m 3 N/A N/A Rods, etc. Ci d. Other (describe):

Liquids for Incineration m 3 1.01E+01 2.50E+01 Ci 8.90E-04 2. Estimate of major nuclide composition (by type of waste)a. Ni-63 7.94E+O 1 b.Co-60 % 6.77E+00 Co-58 % 5.94E+00 Fe-55 % 3.86E+00 Mn-54 % 1.28E+00 Ni-59 % 8.90E-01 Sb-125 % 8.77E-01 Cs-137 % 4.91E-01 Co-57 % 4.09E-01 H-3 i % 5.40E-02 Cs- 134 % 3.36E-02 Nb-94 % 1.27E-02 Tc-99 % 2.80E-03 Fe-55 5.13E+01 Ni-63 % 2.12E+O1 Co-58 % 1.47E+O1 Co-60 % 9.54E+00 Mn-54 % 9.48E-01 Zr-95 % 4.65E-0l Nb-95 % 4.44E-0 I Sb-125 % 4.36E-01 H-3 % 3.32E-01 Co-57 % 2.60E-0I Cs-137 % 1.77E-0I Be-7 % 1.44E-0 1 Cr-51 % 1.37E-01 Sn-113 % 1.55E-02 Ag-110m % 8.46E-03 Fe-59 % 5.30E-03 N/A F% TN/A C.

d. Co-5 8 5.85E+01 H-3 % *3.34E+01 Fe-55 % 7.08E+00 Ni-63 % 5.15E-01 Co-60 % 3.07E-01 Mn-54 % 1.79E-01 Cs-137 % 7.19E-04 3. Solid Waste Disposition Number of Waste Shipments Class Container Type 1 7 2 B General Design A General Design A General Design Solidification Agent N/A N/A N/A Mode of Transportation Truck Truck Truck Destination Studsvik, Erwin, TN EnergySolutions, Oak Ridge, TN EnergySolutions, Kingston, TN B. IRRADIATED FUEL SHIPMENTS (Disposition)

Number of Shipments N/A Mode of Transportation N/A Destination N/A C. REVIEW AND APPROVAL Prepared By: Reviewed By: (Date: ,- i Date: '2l/z 1 /2-.Date: 0Q-4 2. 212.12-Approved By: L 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 2011, as described below.* In Appendix "C", delete page "A" from the NAESCO Seabrook Station EMS Technical Reference Manual due to CANBERRA removing the proprietary information restriction and allowing Seabrook Station to use this information in support of submitting offsite dose calculation information and annual reporting requirements.

  • Fixed typographical error on units in Part A: Radiological Effluent Control and Environmental Monitoring Programs, Table A.9.1-2 and A.9.1-3.

Appendix B Process Control Program Requirement:

The Offsite Dose Calculation Manual 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:

The process control program (PCP) was changed once in 2011* Added Section IV 2.2.5 to address new procedure for verifying no free standing water in a filter HIC /liner." Added Section IV 2.4 to address structural stability." Revised Section IV 3.4 to clarify which filters qualify for drying in accordance with applicable station procedures." Deleted Section IV 4.3 and subsections as they applied to a filter HIC dewatering method no longer used at the station.* Updated procedure references to reflect implementation of new Fleet procedures for packaging and shipping radioactive material.* Removed deleted references and renumbered references throughout.

  • Added new Reference 5.17, procedure WD0598.088, Verification of No Free Standing Water in a Filter HIC / Liner.* Revised the PCP and associated Control in Figure C-i-1 to remove erroneous references to shipping and transportation.

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, 2011 to December 31, 2011, 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 2011, NextEra 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, 2011 to December 31, 2011 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.

See next sheet for groundwater monitoring well results.

2011 Ground Water Monitoring Well Tritium Data Date/Time BD-1 BD-2 BD-3 BD-4 BD-5 BD-6 BU-1 SC-1 SD-1 SD-2 SD-3 SD-4 SD-5 SU-1 SW-1 SW-2 SW-3 SW-4 SW-5 SW-6 SU-10 SU-11 BU-10 BU-11 TW-1 TW-2 TW-3)pring /Summer 2011 Samplin<03/12/11 2850 <584 <586 <584 <583 <596 <587 03/17/11 <555 <560 <560 <559 03/18/11 <562 <559 03/30/11 <562 03/31/11 <559 04/14/11 <563 <559 04/15/11 1 <560 <560 04/16/11 1 <560 <559 05/13/11 <558 <552 <550 <536 <550 2440 <550 <536 <560 06/10/11 1 < 584 1 < 587 1 1 1 Fall/ Winter 2011 Sampling 8 08/13/11 <547 804 1936 <540 08/24/11 <513 <520 <549 <512 <549 08/25/11 <550 <540 <549 09/14/11 1030 11/16/11 <589 2051 12/03/11 <573 <524 <570 12/05/11 <537 _12/16/11 <532 <533 <533 <533 12/17/11 <535 12/22/11 1400 <532 <533 <535 <533 12/23/11 <532 <544 <550 I I Paired well locations:

SD-1 / BD-2 South of plant near seawall inside PA fence SD-2 / BD-3 East of plant inside owner controlled area SD-3 / BD-4 Northeast of plant inside owner controlled area SD-4 / BD-5 Southwest of plant, south of cooling tower inside owner controlled area SD-5 / BD-6 South of Unit 2 containment equipment hatch outside PA fence SU-1 / BU-1 Northwest of plant (Background location) inside owner controlled area SU-10 / BU-10 North / northwest of plant inside PA fence SU-11 / BU-11 North of plant inside PA fence Selected well locations:

SW-1 South of Fuel Storage Building (Indicator location) inside PA fence SW-2 East of plant near Service Water Pump House inside PA fence SW-3 Southwest of plant near Unit I to Unit 2 tunnel inside PA fence SW-4 South of waste process building / steam generator blowdown room inside PA fence SW-5 West of service water building inside PA fence SW-6 Southwest of demineralized tank 259 inside PA fence TW-1 Southeast of plant inside owner controlled area outside PA fence TW-2 Southeast of plant inside owner controlled area outside PA fence TW-3 Southeast of plant inside owner controlled area outside PA fence Note: All sample results in pCi/L Definitions:

S = Shallow C = Cross gradient B = Bedrock D = down gradient U = up gradient T = temporary W = well Enclosure 2 Joint Frequency Distributions of Wind Speed, Wind Direction, and Atmospheric Stability SEABROOK JANII-DECI1 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)43.0 FT WIND DATA STABILITY CLASS A CLASS FREQUENCY (PERCENT)

= 4.87 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 1 0 0 0 0 1 2 0 2 0 1 0 0 0 0 8 (1) .00 .24 .24 .00 .00 .00 .00 .24 .48 .00 .48 .00 .24 .00 .00 .00 .00 1.92 (2) .00 .01 .01 .00 .00 .00 .00 .01 .02 .00 .02 .00 .01 .00 .00 .00 .00 .09 4-7 0 1 1 0 0 5 23 10 6 7 5 12 15 8 2 3 0 98 (1) .00 .24 .24 .00 .00 1.20 5.52 2.40 1.44 1.68 1.20 2.88 3.60 1.92 .48 .72 .00 23.50 (2) .00 .01 .01 .00 .00 .06 .27 .12 .07 .08 .06 .14 .18 .09 .02 .04 .00 1.15 8-12 0 2 1 5 14 24 64 12 5 14 26 42 7 22 7 0 0 245 (1) .00 .48 .24 1.20 3.36 5.76 15.35 2.88 1.20 3.36 6.24 10.07 -1.68 5.28 1.68 .00 .00 58.75 (2) .00 .02 .01 .06 .16 .28 .75 .14 .06 .16 .30 .49 .08 .26 .08 .00 .00 2.86 13-18 1 1 0 4 1 6 5 0 0 3 9 6 3 18 6 0 0 63 (1) .24 .24 .00 .96 .24 1.44 1.20 .00 .00 .72 2.16 1.44 .72 4.32 1.44 .00 .00 15.11 (2) .01 .01 .00 .05 .01 .07 .06 .00 .00 .04 .11 .07 .04 .21 .07 .00 .00 .74 19-24 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0 0 3 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .24 .48 .00 .00 .00 .72 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .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 1 5 3 9 15 35 92 23 13 24 42 60 27 50 15 3 0 417 (1) .24 1.20 .72 2.16 3.60 8.39 22.06 5.52 3.12 5.76 10.07 14.39 6.47 11.99 3.60 .72 .00 100.00 (2) .01 .06 .04 .11 .18 .41 1.08 .27 .15 .28 .49 .70 .32 .58 .18 .04 .00 4.87{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 JANII-DECI1 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)43.0 FT WIND DATA STABILITY CLASS B CLASS FREQUENCY (PERCENT)

= 4.97 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 1 2 0 0 0 0 0 1 2 1 0 3 0 12 (1) .00 .00 .24 .24 .24 .47 .00 .00 .00 .00 .00 .24 .47 .24 .00 .71 .00 2.82 (2) .00 .00 .01 .01 .01 .02 .00 .00 .00 .00 .00 .01 .02 .01 .00 .04 .00 .14 4-7 5 2 2 3 14 2 15 10 1 6 7 14 19 11 5 1 0 117 (1) 1.18 .47 .47 .71 3.29 .47 3.53 2.35 .24 1.41 1.65 3.29 4.47 2,59 1.18 .24 .00 27.53 (2) .06 .02 .02 .04 .16 .02 .18 .12 .01 .07 .08 .16 .22 .13 .06 .01 .00 1.37 8-12 2 1 3 15 32 22 19 3 3 7 27 23 14 25 17 5 0 218 (1) .47 .24 .71 3.53 7.53 5.18 4.47 .71 .71 1.65 6.35 5.41 3.29 5.88 4.00 1.18 .00 51.29 (2) .02 .01 .04 .18 .37 .26 .22 .04 .04 .08 .32 .27 .16 .29 .20 .06 .00 2.55 13-18 0 0 2 3 4 1 0 0 0 1 11 4 10 18 15 4 0 73 (1) .00 .00 .47 .71 .94 .24 .00 .00 .00 .24 2.59 .94 2.35 4.24 3.53 .94 .00 17.18 (2) .00 .00 .02 .04 .05 .01 .00 .00 .00 .01 .13 .05 .12 .21 .18 .05 .00 .85 19-24 0 0 0 0 0 0 0 0 0 1 0 0 1 2 1 0 0 5 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .24 .00 .00 .24 .47 .24 .00 .00 1.18 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .01 .02 .01 .00 .00 .06 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 7 3 8 22 51 27 34 13 4 15 45 42 46 57 38 13 0 425 (1) 1.65 .71 1.88 5.18 12.00 6.35 8.00 3.06 .94 3.53 10.59 9.88 10.82 13.41 8.94 3.06 .00 100.00 (2) .08 .04 .09 .26 .60 .32 .40 .15 .05 .18 .53 .49 .54 .67 .44 .15 .00 4.97 (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 JAN1I-DECI1 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)43.0 FT WIND DATA STABILITY CLASS C CLASS FREQUENCY (PERCENT)

= 6.85 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 0 0 0 2 4 1 0 1 0 2 1 1 3 0 1 1 0 17 (1) .00 .00 .00 .34 .68 .17 .00 .17 .00 .34 .17 .17 .51 .00 .17 .17 .00 2.90 (2) .00 .00 .00 .02 .05 .01 .00 .01 .00 .02 .01 .01 .04 .00 .01 .01 .00 .20 4-7 6 9 1 14 23 7 17 13 8 9 16 25 22 19 10 11 0 210 (1) 1.02 1.54 .17 2ý39 3.92 1.19 2.90 2.22 1.37 1.54 2.73 4.27 3.75 3.24 1.71 1.88 .00 35.84 (2) .07 .11 .01 .16 .27 .08 .20 .15 .09 .11 .19 .29 .26 .22 .12 .13 .00 2.45 8-12 4 3 5 27 32 16 7 8 1 13 33 28 28 37 32 5 0 279 (1) .68 .51 .85 4.61 5.46 2.73 1.19 1.37 .17 2.22 5.63 4.78 4.78 6.31 5.46 .85 .00 47.61 (2) .05 .04 .06 .32 .37 .19 .08 .09 .01 .15 .39 .33 .33 .43 .37 .06 .00 3.26 13-18 0 0 2 2 1 1 1 0 1 2 12 10 8 20 14 1 0 75 (1) .00 .00 .34 .34 .17 .17 .17 .00 .17 .34 2.05 1.71 1.37 3.41 2.39 .17 .00 12.80 (2) .00 .00 .02 .02 .01 .01 .01 .00 .01 .02 .14 .12 .09 .23 .16 .01 .00 .88 19-24 0 0 0 0 0 0 0 0 0 0 0 0 1 1 3 0 0 5 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .17 .17 .51 .00 .00 .85 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .01 .04 .00 .00 .06 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 12 8 45 60 25 25 22 10 26 62 64 62 77 60 18 0 586 (1) 1.71 2.05 1.37 7.68 10.24 4.27 4.27 3.75 1.71 4.44 10.58 10.92 10.58 13.14 10.24 3.07 .00 100.00 (2) .12 .14 .09 .53 .70 .29 .29 .26 .12 .30 .72 .75 .72 .90 .70 .21 .00 6.85 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD Cý CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JANII-DECI1 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)43.0 FT WIND DATA STABILITY CLASS D CLASS FREQUENCY (PERCENT)

= 46.3?WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSWW W WNW NW NNW VRBL TOTAL MPH CALM 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 (1) .03 .0D .0 .00 .0D .0D .DD .00 .00 .00 .00 .00 .00 .00 .00 .03 .00 .05 (2) .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .02 C-3 25 34 26 41 12 9 15 18 27 11 21 15 27 32 32 22 0 367 (1) .63 .86 .66 1.03 .30 .23 .38 .45 .68 .28 .53 .38 .68 .81 .81 .55 .00 9.25 (2) .29 .40 .30 .48 .14 .11 .18 .21 .32 .13 .25 .18 .32 .37 .37 .26 .00 4.29 4-7 1i1 83 75 101 88 51 79 96 89 65 90 87 i11 156 159 112 0 1553 (1) 2.80 2.09 1.89 2.55 2.22 1.29 1.99 2.42 2.24 1.64 2.27 2.19 2.80 3.93 4.01 2.82 .00 39.14 (2) 1.30 .97 .88 1.18 1.03 .60 .92 1.12 1.04 .76 1.05 1.02 1.30 1.82 1.86 1.31 .00 18.15 8-12 63 38 125 90 89 37 37 35 24 80 164 88 94 218 199 52 0 1433 (1) 1.59 .96 3.15 2.27 2.24 .93 .93 .88 .60 2.02 4.13 2.22 2.37 5.49 5.02 1.31 .00 36.11 (2) .74 .44 1.46 1.05 1.04 .43 .43 .41 .28 .93 1.92 1.03 1.10 2.55 2.33 .61 .00 16.75 13-18 1 7 97 22 39 18 11 6 3 24 54 13 29 114 101 5 0 544 (1) .03 .18 2.44 .55 .98 .45 .28 .15 .08 .60 1.36 ,33 .73 2.87 2.55 .13 .00 13.71 (2) .01 .08 1.13 .26 .46 .21 .13 .07 .04 .28 .63 .15 .34 1.33 1.18 .06 .00 6.36 19-24 0 0 9 3 3 1 0 0 0 0 2 2 2 18 27 0 0 67 (1) .00 .00 .23 .08 .08 .03 .00 .00 .00 .00 .05 .05 .05 .45 .68 .00 .00 1.69 (2) .00 .00 .11 .04 .04 .01 .00 .00 .00 .00 .02 .02 .02 .21 .32 .00 .00 .78 GT 24 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 2 (1) .00 .00 .00 .03 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .03 .00 .00 .05 (2) .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .02 ALL SPEEDS 201 162 332 258 231 116 142 155 143 180 331 205 263 538 519 192 0 3968 (1) 5.07 4.08 8.37 6.50 5.82 2.92 3.58 3.91 3.60 4.54 8.34 5.17 6.63 13.56 13.08 4.84 .00 100.00 (2) 2.35 1.89 3.88 3.02 2.70 1.36 1.66 1.81 1.67 2.10 3.87 2.40 3.07 6.29 6.07 2.24 .00 46.37 (1)=PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)=PFRCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JAN1I-DECII MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)43.0 FT WIND DATA STABILITY CLASS E CLASS FREQUENCY (PERCENT)

= 21.84 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 1 0 0 0 1 0 0 1 0 0 0 1 0 0 4 (I) .00 .00 .00 .05 .00 .00 .00 .05 .00 .00 .05 .00 .00 .00 .05 .00 .00 .21 (2) .00 .00 .00 .01 .00 .00 .00 .01 .00 .00 .01 .00 .00 .00 .01 .00 .00 .05 C-3 12 17 22 27 19 10 15 15 18 43 45 45 79 51 50 23 0 491 (1) .64 .91 1.18 1.44 1.02 .54 .80 .80 .96 2.30 2.41 2.41 4.23 2.73 2.68 1.23 .00 26.27 (2) .14 .20 .26 .32 .22 .12 .18 .18 .21 .50 .53 .53 .92 .60 .58 .27 .00 5.74 4-7 13 9 9 14 33 15 42 36 48 71 136 193 190 181 77 31 0 1098 (1) .70 .48 .48 .75 1.77 .80 2.25 1.93 2.57 3.80 7.28 10.33 10.17 9.68 4.12 1.66 .00 58.75 (2) .15 .11 .11 .16 .39 .18 .49 .42 .56 .83 1.59 2.26 2.22 2.12 .90 .36 .00 12.83 8-12 2 1 10 9 10 7 6 5 11 18 39 49 24 23 12 3 0 229 (1) .11 .05 .54 .48 .54 .37 .32 .27 .59 .96 2.09 2.62 1.28 1.23 .64 .16 .00 12.25 (2) .02 .01 .12 .11 .12 .08 .07 .06 .13 .21 .46 .57 .28 .27 .14 .04 .00 2.68 13-18 3 0 5 1 1 0 1 0 0 3 5 0 3 7 7 .3 0 39 (1) .16 .00 .27 .05 .05 .00 .05 .00 .00 .16 .27 .00 .16 .37 .37 .16 .00 2.09 (2) .04 .00 .06 .01 .01 .00 .01 .00 .00 .04 .06 .00 .04 .08 .08 .04 .00 .46 19-24 0 0 0 1 3 0 0 0 0 0 0 0 0 0 0 1 0 5 (1) .00 .00 .00 .05 .16 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .05 .00 .27 (2) .00 .00 .00 .01 .04 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .06 GT 24 0 0 0 0 2 1 0 0 0 0 0 0 0 0 0 0 0 3 (1) .00 .00 .00 .00 .11 .05 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .16 (2) .00 .00 .00 .00 .02 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .04 ALL SPEEDS 30 27 46 53 68 33 64 57 77 135 226 287 296 262 147 61 0 1869 (1) 1.61 1.44 2.46 2.84 3.64 1.77 3.42 3.05 4.12 7.22 12.09 15.36 15.84 14.02 7.87 3.26 .00 100.00 (2) .35 .32 .54 .62 .79 .39 .75 .67 .90 1.58 2.64 3.35 3.46 3.06 1.72 .71 .00 21.84 (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 JAN1I-DECII MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)43.0 FT WIND DATA STABILITY CLASS F CLASS FREQUENCY (PERCENT)

= 8.29 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 0 0 0 0 0 0 0 0 0 2 0 0 0 0 3 (1) .14 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .28 .00 .00 .00 .00 .42 (2) .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 .00 .00 .00 .00 .04 C-3 12 6 17 12 13 5 5 2 6 16 26 48 91 73 63 25 0 420 (1) 1.69 .85 2.40 1.69 1.83 .71 .71 .28 .85 2.26 3.67 6.77 12.83 10.30 8.89 3.53 .00 59.24 (2) .14 .07 .20 .14 .15 .06 .06 .02 .07 .19 .30 .56 1.06 .85 .74 .29 .00 4.91 4-7 3 2 0 6 3 1 2 3 3 8 28 49 70 43 51 9 0 281 (1) .42 .28 .00 .85 .42 .14 .28 .42 .42 1.13 3.95 6.91 9.87 6.06 7.19 1.27 .00 39.63 (2) .04 .02 .00 .07 .04 .01 .02 .04 .04 .09 .33 .57 .82 .50 .60 .11 .00 3.28 8-12 0 0 1 0 1 0 0 0 0 1 0 0 0 1 0 0 0 4 (1) .00 .00 .14 .00 .14 .00 .00 .00 .00 .14 .00 .00 .00 .14 .00 .00 .00 .56 (2) .00 .00 .01 .00 .01 .00 .00 .00 .00 .01 .00 .00 .00 .01 .00 .00 .00 .05 13-18 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 .14 .00 .14 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .01 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 16 8 18 18 17 6 7 5 9 25 54 97 163 117 114 35 0 709 (1) 2.26 1.13 2.54 2.54 2.40 .85 .99 .71 1.27 3.53 7.62 13.68 22.99 16.50 16.08 4.94 .00 100.00 (2) .19 .09 .21 .21 .20 .07 .08 .06 .11 .29 .63 1.13 1.90 1.37 1.33 .41 .00 8.29 (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 JANII-DECI1 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)43.0 FT WIND DATA STABILITY CLASS G CLASS FREQUENCY (PERCENT)

= 6.81 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 1 1 0 0 0 0 1 0 1 0 1 0 0 0 5 (1) .00 .00 .00 .17 .17 .00 .00 .00 .00 .17 .00 .17 .00 .17 .00 .00 .00 .86 (2) .00 .00 .00 .01 .01 .00 .00 .00 .00 .01 .00 .01 .00 .01 .00 .00 .00 .06 C-3 16 4 9 13 5 4 3 3 5 4 18 73 120 141 53 12 0 483 (1) 2.74 .69 1.54 2.23 .86 .69 .51 .51 .86 .69 3.09 12.52 20.58 24.19 9.09 2.06 .00 82.85 (2) .19 .05 .11 .15 .06 .05 .04 .04 .06 .05 .21 .85 1.40 1.65 .62 .14 .00 5.64 4-7 0 0 0 0 3 0 0 1 0 0 3 10 13 39 24 1 0 94 (1) .00 .00 .00 .00 .51 .00 .00 .17 .00 .00 .51 1.72 2.23 6.69 4.12 .17 .00 16.12 (2) .00 .00 .00 .00 .04 .00 .00 .01 .00 .00 .04 .12 .15 .46 .28 .01 .00 1.10 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 .17 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .17 (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 16 4 9 14 10 4. 3 4 5 5 21 84 133 181 77 13 0 583 (1) 2.74 .69 1.54 2.40 1.72 .69 .51 .69 .86 .86 3.60 14.41 22.81 31.05 13.21 2.23 .00 100.00 (2) .19 .05 .11 .16 .12 .05 .04 .05 .06 .06 .25 .98 1.55 2.12 .90 .15 .00 6.81 (1)-PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PAGE (2)2PERCENT OF ALL GOOD OBSERVATIONS FOR THIS PERIOD C= CALM (WIND SPEED LESS THAN OR EQUAL TO .95 MPH)

SEABROOK JANII-DECll 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 2 0 0 2 1 0 0 1 0 1 1 1 2 1 1 1 0 14 (1) .02 .00 .00 .02 .01 .00 .00 .01 .00 .01 .01 .01 .02 .01 .01 .01 .00 .16 (2) .02 .00 .00 .02 .01 .00 .00 .01 .00 .01 .01 .01 .02 .01 .01 .01 .00 .16 C-3 65 62 76 96 54 31 38 40 58 76 113 183 323 298 199 86 0 1798 (1) .76 .72 .89 1.12 .63 .36 .44 .47 .68 .89 1.32 2.14 3.77 3.48 2.33 1.01 .00 21.01 (2) .76 .72 .89 1.12 .63 .36 .44 .47 .68 .89 1.32 2.14 3.77 3.48 2.33 1.01 .00 21.01 4-7 138 106 88 138 164 81 178 169 155 166 285 390 440 457 328 168 0 3451 (1) 1.61 1.24 1.03 1.61 1.92 .95 2.08 1.97 1.81 1.94 3.33 4.56 5.14 5.34 3.83 1.96 .00 40.33 (2) 1.61 1.24 1.03 1.61 1.92 .95 2.08 1.97 1.81 1.94 3.33 4.56 5.14 5.34 3.83 1.96 .00 40.33 8-12 71 45 145 146 179 106 133 63 44 133 289 230 167 326 267 65 0 2409 (1) .83 .53 1.69 1.71 2.09 1.24 1.55 .74 .51 1.55 3.38 2.69 1.95 3.81 3.12 .76 .00 28.15 (2) .83 .53 1.69 1.71 2.09 1.24 1.55 .74 .51 1.55 3.38 2.69 1.95 3.81 3.12 .76 .00 28.15 13-18 5 8 106 32 46 26 18 6 4 33 91 33 53 177 143 14 0 795 (1) .06 .09 1.24 .37 .54 .30 .21 .07 .05 .39 1.06 .39 .62 2.07 1.67 .16 .00 9.29 (2) .06 .09 1.24 .37 .54 .30 .21 .07 .05 .39 1.06 .39 .62 2.07 1.67 .16 .00 9.29 19-24 0 0 9 4 6 1 0 0 0 1 2 2 5 23 31 1 0 85 (1) .00 .00 .11 .05 .07 .01 .00 .00 .00 .01 .02 .02 .06 .27 .36 .01 .00 .99 (2) .00 .00 .11 .05 .07 .01 .00 .00 .00 .01 .02 .02 .06 .27 .36 .01 .00 .99 GT 24 0 0 0 1 2 1 0 0 0 0 0 0 0 0 1 0 0 5 (1) .00 .00 .00 .01 .02 .01 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .06 (2) .00 .00 .00 .01 .02 .01 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .06 ALL SPEEDS 281 221 424 419 452 246 367 279 261 410 781 839 990 1282 970 335 0 8557 (1) 3.28 2.58 4.96 4.90 5.28 2.87 4.29 3.26 3.05 4.79 9.13 9.80 11.57 14.98 11.34 3.91 .00 100.00 (2) 3.28 2.58 4.96 4.90 5.28 2.87 4.29 3.26 3.05 4.79 9.13 9.80 11.57 14.98 11.34 3.91 .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 JAN1I-DECII MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)209.0 FT WIND DATA STABILITY CLASS A CLASS FREQUENCY (PERCENT)

= 4.88 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 0 0 0 0 0 1 0 .1 1 0 1 1 0 0 6 (1) .00 .00 .24 .00 .00 .00 .00 .00 .24 .00 .24 .24 .00 .24 .24 .00 .00 1.44 (2) .00 .00 .01 .00 .00 .00 .00 .00 .01 .00 .01 .01 .00 .01 .01 .00 .00 .07 4-7 1 0 1 1 1 0 7 1 2 3 5 5 5 3 1 4 0 40 (1) .24 .00 .24 .24 .24 .00 1.68 .24 .48 .72 1.20 1.20 1.20 .72 .24 .96 .00 9.59 (2) .01 .00 .01 .01 .01 .00 .08 .01 .02 .04 .06 .06 .06 .04 .01 .05 .00 .47 8-12 0 1 0 2 8 11 60 26 7 4 15 23 21 15 3 0 0 196 (1) .00 .24 .00 .48 1.92 2.64 14.39 6.24 1.68 .96 3.60 5.52 5.04 3.60 .72 .00 .00 47.00 (2) .00 .01 .00 .02 .09 .13 .70 .30 .08 .05 .18 .27 .25 .18 .04 .00 .00 2.29 13-18 0 1 1 5 5 3 21 12 1 10 17 24 7 16 4 1 0 128 (1) .00 .24 .24 1.20 1.20 .72 5.04 2.88 .24 2.40 4.08 5.76 1.68 3.84 .96 .24 .00 30.70 (2) .00 .01 .01 .06 .06 .04 .25 .14 .01 .12 .20 .28 .08 .19 .05 .01 .00 1.50 19-24 1 1 0 0 1 4 2 1 0 0 3 4 3 16 6 0 0 42 (1) .24 .24 .00 .00 .24 .96 .48 .24 .00 .00 .72 .96 .72 3.84 1.44 .00 .00 10.07 (2) .01 .01 .00 .00 .01 .05 .02 .01 .00 .00 .04 .05 .04 .19 .07 .00 .00 .49 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 2 3 0 0 0 5 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .48 .72 .00 .00 .00 1.20 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 .04 .00 .00 .00 .06 ALL SPEEDS 2 3 3 8 15 18 90 40 11 17 41 57 38 54 15 5 0 417 (1) .48 .72 .72 1.92 3.60 4.32 21.58 9.59 2.64 4.08 9.83 13.67 9.11 12.95 3.60 1.20 .00 100.00 (2) .02 .04 .04 .09 .18 .21 1.05 .47 .13 .20 .48 .67 .44 .63 .18 .06 .00 4.88 (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 JANII-DECI1 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)209.0 FT WIND DATA STABILITY CLASS B CLASS FREQUENCY (PERCENT)

= 4.97 WIND DIRECTION FROM SPEED N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW VRBL TOTAL MPN 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 1 0 2 0 0 0 0 0 .0 1 0 2 1 0 8 (1) .00 .24 .00 .24 .00 .47 .00 .00 .00 .00 .00 .00 .24 .00 .47 .24 .00 1.88 (2) .00 .01 .00 .01 .00 .02 .00 .00 .00 .00 .00 .00 .01 .00 .02 .01 .00 .09 4-7 3 1 0 3 9 3 3 2 3 3 3 7 7 7 3 1 0 58 (1) .71 .24 .00 .71 2.12 .71 .71 .47 .71 .71 .71 1.65 1.65 1.65 .71 .24 .00 13.65 (2) .04 .01 .00 .04 .11 .04 .04 .02 .04 .04 .04 .08 .08 .08 .04 .01 .00 .68 8-12 1 1 3 13 22 20 27 12 6 7 7 18 15 21 8 3 0 184 (1) .24 .24 .71 3.06 5.18 4.71 6.35 2.82 1.41 1.65 1.65 4.24 3.53 4.94 1.88 .71 .00 43.29 (2) .01 .01 .04 .15 .26 .23 .32 .14 .07 .08 .08 .21 .18 .25 .09 .04 .0o 2.15 13-18 2 1 1 6 9 0 3 3 1 3 24 19 10 18 15 7 0 122 (1) .47 .24 .24 1.41 2.12 .00 .71 .71 .24 .71 5.65 4.47 2.35 4.24 3.53 1.65 .00 28.71 (2) .02 .01 .01 .07 .11 .00 .04 .04 .01 .04 .28 .22 .12 .21 .18 .08 .00 1.43 19-24 0 0 2 0 0 0 0 0 0 0 6 2 10 14 11 1 0 46 (1) .00 .00 .47 .00 .00 .00 .00 .00 .00 .00 1.41 .47 2.35 3.29 2.59 .24 .00 10.82 (2) .00 .00 .02 .00 .00 .00 .00 .00 .00 .00 .07 .02 .12 .16 .13 .01 .00 .54 GT 24 0 0 0 0 0 0 0 0 0 0 1 0 1 3 2 0 0 7 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .24 .00 .24 .71 .47 .00 .00 1.65 (2) .00 .00 ..00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .01 .04 .02 .00 .00 .08 ALL SPEEDS 6 4 6 23 40 25 33 17 10 13 41 46 44 63 41 13 0 425 (1) 1.41 .94 1.41 5.41 9.41 5.88 7.76 4.00 2.35 3.06 9.65 10.82 10.35 14.82 9.65 3.06 .00 100.00 (2) .07 .05 .07 .27 .47 .29 .39 .20 .12 .15 .48 .54 .51 .74 .48 .15 .00 4.97 (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 JAN1I-DECI1 MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)209.0 FT WIND DATA STABILITY CLASS C CLASS FREQUENCY (PERCENT)

= 6.85 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 0 1 1 3 1 0 1 1 0 0 1 0 1 1 1 0 0 12 (1) .00 .17 .17 .51 .17 .00 .17 .17 .00 .00 .17 .00 .17 .17 .17 .00 .00 2.05 (2) .00 .01 .01 .04 .01 .00 .01 .01 .00 .00 .01 .00 .01 .01 .01 .00 .00 .14 4-7 10 2 1 5 17 8 8 5 5 9 9 6 7 9 4 4 0 109 (1) 1.71 .34 .17 .85 2.90 1.37 1.37 .85 .85 1.54 1.54 1.02 1.19 1.54 .68 .68 .00 18.60 (2) .12 .02 .01 .06 .20 .09 .09 .06 .06 .11 .11 .07 .08 .11 .05 .05 .00 1.28 8-12 9 5 5 32 22 25 9 13 6 7 21 32 28 25 16 7 0 262 (1) 1.54 .85 .85 5.46 3.75 4.27 1.54 2.22 1.02 1.19 3.58 5.46 4.78 4.27 2.73 1.19 .00 44.71 (2) .11 .06 .06 .37 .26 .29 .11 .15 .07 .08 .25 .37 .33 .29 .19 .08 .00 3.06 13-18 1 1 3 3 1 1 2 8 2 4 23 14 22 34 24 4 0 147 (1) .17 .17 .51 .51 .17 .17 .34 1.37 .34 .68 3.92 2.39 3.75 5.80 4.10 .68 .00 25.09 (2) .01 .01 .04 .04 .01 .01 .02 .09 .02 .05 .27 .16 .26 .40 .28 .05 .00 1.72 19-24 0 0 1 0 0 1 0 6 0 0 7 9 9 15 9 0 0 51 (1) .00 .00 .17 .00 .00 .17 .00 .00 .00 .00 1.19 1.54 1.54 2.56 1.54 .00 .00 8.70 (2) .00 .00 .01 .00 .00 .01 .00 .00 .00 .00 .08 .11 .11 .18 .11 .00 .00 .60 GT 24 0 0 0 0 0 0 0 0 0 0 0 0 2 1 2 10 0 5 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .34 .17 .34 .00 .00 .85 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 .01 .02 .00 .00 .06 ALL SPEEDS 20 9 11 43 41 35 20 27 13 20 61 61 69 85 56 15 0 586 (1) 3.41 1.54 1.88 7.34 7.00 5.97 3.41 4.61 2.22 3.41 10.41 10.41 11.77 14.51 9.56 2.56 .00 100.00 (2) .23 .11 .13 .50 .48 .41 .23 .32 .15 .23 .71 .71 .81 .99 .66 .18 .00 6.85 (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 JAN1I-DECII MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)209.0 FT WIND DATA STABILITY CLASS D CLASS FREQUENCY (PERCENT)

= 46.32 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 10 16 11 15 8 6 9 6 7 7 6 3 6 10 9 7 0 136 (1) .25 .40 .28 .38 .20 .15 .23 .15 .18 .18 .15 .08 .15 .25 .23 .18 .00 3.43 (2) .12 .19 .13 .18 .09 .07 .11 .07 .08 .08 .07 .04 .07 .12 .11 .08 .00 1.59 4-7 55 53 41 76 46 49 57 53 42 51 34 27 37 53 55 33 0 762 (1) 1.39 1.34 1.04 1.92 1.16 1.24 1.44 1.34 1.06 1.29 .86 .68 .93 1.34 1.39 .83 .00 19.24 (2) .64 .62 .48 .89 .54 .57 .67 .62 .49 .60 .40 .32 .43 .62 .64 .39 .00 8.91 8-12 132 81 61 78 46 55 34 83 86 67 85 85 73 163 142 83 0 1354 (1) 3.33 2.05 1.54 1.97 1.16 1.39 .86 2.10 2.17 1.69 2.15 2.15 1.84 4.12 3.59 2.10 .00 34.19 (2) 1.54 .95 .71 .91 .54 .64 .40 .97 1.01 .78 .99 .99 .85 1.91 1.66 .97 .00 15.84 13-18 67 57 124 43 24 19 19 27 20 58 165 72 82 178 166 32 0 1153 (1) 1.69 1.44 3.13 1.09 .61 .48 .48 .68 .51 1.46 4.17 1.82 2.07 4.49 4.19 .81 .00 29.12 (2) .78 .67 1.45 .50 .28 .22 .22 .32 .23 .68 1.93 .84 .96 2.08 1.94 .37 .00 13.49 19-24 8 15 51 14 24 14 10 5 2 17 42 17 30 103 67 3 0 422 (1) .20 .38 1.29 .35 .61 .35 .25 .13 .05 .43 1.06 .43 .76 2.60 1.69 .08 .00 10.66 (2) .09 .18 .60 .16 .28 .16 .12 .06 .02 .20 .49 .20 .35 1.20 .78 .04 .00 4.94 GT 24 1 4 18 6 5 2 6 5 1 0 2 1 13 33 36 0 0 133 (1) .03 .10 .45 .15 .13 .05 .15 .13 .03 .00 .05 .03 .33 .83 .91 .00 .00 3.36 (2) .01 .05 .21 .07 .06 .02 .07 .06 .01 .00 .02 .01 .15 .39 .42 .00 .00 1.56 ALL SPEEDS 273 226 306 232 153 145 135 179 158 200 334 205 241 540 475 158 0 3960 (1) 6.89 5.71 7.73 5.86 3.86 3.66 3.41 4.52 3.99 5.05 8.43 5.18 6.09 13.64 11.99 3.99 .00 100.00 (2) 3.19 2.64 3.58 2.71 1.79 .1.70 1.58 2.09 1.85 2.34 3.91 2.40 2.82 6.32 5.56 1.85 .00 46.32 (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 JAN1I-DECII MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)209.0 FT WIND DATA STABILITY CLASS E CLASS FREQUENCY (PERCENT)

= 21.86 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 2 8 3 5 3 6 10 8 4 6 4 5 4 4 3 8 0 83 (1) .11 .43 .16 .27 .16 .32 .54 .43 .21 .32 .21 .27 .21 .21 .16 .43 .00 4.44 (2) .02 .09 .04 .06 .04 .07 .12 .09 .05 .07 .05 .06 .05 .05 .04 .09 .00 .97 4-7 25 7 10 21 15 19 32 24 35 35 18 18 26 29 20 19 0 353 (1) 1.34 .37 .54 1.12 .80 1.02 1.71 1.28 1.87 1.87 .96 .96 1.39 1.55 1.07 1.02 .00 18.89 (2) .29 .08 .12 .25 .18 .22 .37 .28 .41 .41 .21 .21 .30 .34 .23 .22 .00 4.13 8-12 29 11 8 8 6 3 18 31 67 89 128 102 106 145 72 37 0 860 (1) 1.55 .59 .43 .43 .32 .16 .96 1.66 3.58 4.76 6.85 5.46 5.67 7.76 3.85 1.98 .00 46.01 (2) .34 .13 .09 .09 .07 .04 .21 .36 .78 1.04 1.50 1.19 1.24 1.70 .84 .43 .00 10.06 13-18 11 9 11 7 1 3 7 14 16 26 75 94 83 105 35 7 0 504 (1) .59 .48 .59 .37 .05 .16 .37 .75 .86 1.39 4.01 5.03 4.44 5.62 1.87 .37 .00 26.97 (2) .13 .11 .13 .08 .01 .04 .08 .16 .19 .30 .88 1.10 .97 1.23 .41 .08 .00 5.90 19-24 0 1 3 2 1 1 0 1 1 2 5 7 12 5 7 5 0 53 (1) .00 .05 .16 .11 .05 .05 .00 .05 .05 .11 .27 .37 .64 .27 .37 .27 .00 2.84 (2) .00 .01 .04 .02 .01 .01 .00 .01 .01 .02 .06 .08 .14 .06 .08 .06 .00 .62 GT 24 3 0 0 0 4 4 0 1 0 0 0 0 1 2 0 1 0 16 (1) .16 .00 .00 .00 .21 .21 .00 .05 .00 .00 .00 .00 .05 .11 .00 .05 .00 .86 (2) .04 .00 .00 .00 .05 .05 .00 .01 .00 .00 .00 .00 .01 .02 .00 .01 .00 .19 ALL SPEEDS 70 36 35 43 30 36 67 79 123 158 230 226 232 290 137 77 0 1869 (1) 3.75 1.93 1.87 2.30 1.61 1.93 3.58 4.23 6.58 8.45 12.31 12.09 12.41 15.52 7.33 4.12 .00 100.00 (2) .82 .42 .41 .50 .35 .42 .78 .92 1.44 1.85 2.69 2.64 2.71 3.39 1.60 .90 .00 21.86 (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 JAN1I-DECII MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)209.0 FT WIND DATA STABILITY CLASS F CLASS FREQUENCY (PERCENT)

= 8.29 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 1 0 0 0 0 0 1 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .14 .00 .00 .00 .00 .00 .14 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .01 C-3 2 3 1 4 2 2 3 9 1 1 7 3 7 3 3 1 0 52 (1) .28 .42 .14 .56 .28 .28 .42 1.27 .14 .14 .99 .42 .99 .42 .42 .14 .00 7.33 (2) .02 .04 .01 .05 .02 .02 .04 .11 .01 .01 .08 .04 .08 .04 .04 .01 .00 .61 4-7 3 7 6 7 4 6 6 10 21 14 25 24 19 14 14 8 0 188 (1) .42 .99 .85 .99 .56 .85 .85 1.41 2.96 1.97 3.53 3.39 2.68 1.97 1.97 1.13 .00 26.52 (2) .04 .08 .07 .08 .05 .07 .07 .12 .25 .16 .29 .28 .22 .16 .16 .09 .00 2.20 8-12 22 5 6 2 2 0 8 8 11 31 31 40 55 45 49 19 0 334 (1) 3.10 .71 .85 .28 .28 .00 1.13 1.13 1.55 4.37 4.37 5.64 7.76 6.35 6.91 2.68 .00 47.11 (2) .26 .06 .07 .02 .02 .00 .09 .09 .13 .36 .36 .47 .64 .53 .57 .22 .00 3.91 13-18 11 2 0 0 1 0 0 2 1 5 13 14 22 35 15 11 0 132 (1) 1.55 .28 .00 .00 .14 .00 .00 .28 .14 .71 1.83 1.97 3.10 4.94 2.12 1.55 .00 18.62 (2) .13 .02 .00 .00 .01 .00 .00 .02 .01 .06 .15 .16 .26 .41 .18 .13 .00 1.54 19-24 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 2 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .14 .00 .14 .00 .28 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .01 .00 .02 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 38 17 13 13 9 8 17 29 34 51 76 82 103 98 81 40 0 709 (1) 5.36 2.40 1.83 1.83 1.27 1.13 2.40 4.09 4.80 7.19 10.72 11.57 14.53 13.82 11.42 5.64 .00 100.00 (2) .44 .20 .15 .15 .11 .09 :20 .34 .40 .60 .89 .96 1.20 1.15 .95 .47 .00 8.29 (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 JAN1I-DECII MET DATA JOINT FREQUENCY DISTRIBUTION (210-FOOT TOWER)209.0 FT WIND DATA STABILITY CLASS G CLASS FREQUENCY (PERCENT)

= 6.82 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 3 4 4 5 3 2 3 1 3 4 6 2 5 6 4 3 0 58 (1) .51 .69 .69 .86 .51 .34 .51 .17 .51 .69 1.03 .34 .86 1.03 .69 .51 .00 9.95 (2) .04 .05 .05 .06 .04 .02 .04 .01 .04 .05 .07 .02 .06 .07 .05 .04 .00 .68 4-7 12 9 5 4 3 4 11 12 17 17 20 19 19 26 21 17 0 216 (1) 2.06 1.54 .86 .69 .51 .69 1.89 2.06 2.92 2.92 3.43 3.26 3.26 4.46 3.60 2.92 .00 37.05 (2) .14 .11 .06 .05 .04 .05 .13 .14 .20 .20 .23 =22 .22 .30 .25 .20 .00 2.53 8-12 21 17 9 3 8 1 4 6 19 19 20 28 26 28 30 37 0 276 (1) 3.60 2.92 1.54 .51 1.37 .17 .69 1.03 3.26 3.26 3.43 4.80 4.46 4.80 5.15 6.35 .00 47.34 (2) .25 .20 .11 .04 .09 .01 .05 .07 .22 .22 .23 .33 .30 .33 .35 .43 .00 3.23 13-18 0 0 0 0 0 0 0 2 1 1 4 7 4 6 3 5 0 33 (1) .00 .00 .00 .00 .00 .00 .00 .34 .17 .17 .69 1.20 .69 1.03 .51 .86 .00 5.66 (2) .00 .00 .00 .00 .00 .00 .00 .02 .01 .01 .05 .08 .05 .07 .04 .06 .00 .39 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 36 30 18 12 14 7 18 21 40 41 50 56 54 66 58 62 0 583 (1) 6.17 5.15 3.09 2.06 2.40 1.20 3.09 3.60 6.86 7.03 8.58 9.61 9.26 11.32 9.95 10.63 .00 100.00 (2) .42 .35 .21 .14 .16 .08 .21 .25 .47 .48 .58 .66 .63 .77 .68 .73 .00 6.82 (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 JANII-DECI1 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 0 0 0 0 0 0 0 1 0 0 0 0 0 1 (1) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .01 (2) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .01 C-3 17 33 21 33 17 18 26 25 16 18 25 14 24 25 23 20 0 355 (1) .20 .39 .25 .39 .20 .21 .30 .29 .19 .21 .29 .16 .28 .29 .27 .23 .00 4.15 (2) .20 .39 .25 .39 .20 .21 .30 .29 .19 .21 .29 .16 .28 .29 .27 .23 .00 4.15 4-7 109 79 64 117 95 89 124 107 125 132 114 106 120 141 118 86 0 1726 (1) 1.28 .92 .75 1.37 1.11 1.04 1.45 1.25 1.46 1.54 1.33 1.24 1.40 1.65 1.38 1.01 .00 20.19 (2) 1.28 .92 .75 1.37 1.11 1.04 1.45 1.25 1.46 1.54 1.33 1.24 1.40 1.65 1.38 1.01 .00 20.19 8-12 214 121 92 138 114 115 160 179 202 224 307 328 324 442 320 186 0 3466 (1) 2.50 1.42 1.08 1.61 1.33 1.35 1.87 2.09 2.36 2.62 3.59 3.84 3.79 5.17 3.74 2.18 .00 40.54 (2) 2.50 1.42 1.08 1.61 1.33 1.35 1.87 2.09 2.36 2.62 3.59 3.84 3.79 5.17 3.74 2.18 .00 40.54 13-18 92 71 140 64 41 26 52 68 42 107 321 244 230 392 262 67 0 2219 (1) 1.08 .83 1.64 .75 .48 .30 .61 .80 .49 1.25 3.75 2.85 2.69 4.59 3.06 .78 .00 25.96 (2) 1.08 .83 1.64 .75 .48 .30 .61 .80 .49 1.25 3.75 2.85 2.69 4.59 3.06 .78 .00 25.96 19-24 9 17 57 16 26 20 12 7 3 19 63 39 64 154 100 10 0 616 (1) .11 .20 .67 .19 .30 .23 .14 .08 .04 .22 .74 .46 .75 1.80 1.17 .12 .00 7.21 (2) .11 .20 .67 .19 .30 .23 .14 .08 .04 .22 .74 .46 .75 1.80 1.17 .12 .00 7.21 GT 24 4 4 18 6 9 6 6 6 1 0 3 1 19 42 40 1 0 166 (1) .05 .05 .21 .07 .11 .07 .07 .07 .01 .00 .04 .01 .22 .49 .47 .01 .00 1.94 (2) .05 .05 .21 .07 .11 .07 .07 .07 .01 .00 .04 .01 .22 .49 .47 .01 .00 1.94 ALL SPEEDS 445 325 392 374 302 274 380 392 389 500 833 733 781 1196 863 370 0 8549 (1) 5.21 3.80 4.59 4.37 3.53 3.21 4.44 4.59 4.55 5.85 9.74 8.57 9.14 13.99 10.09 4.33 .00 100.00 (2) 5.21 3.80 4.59 4.37 3.53 3.21 4.44 4.59 4.55 5.85 9.74 8.57 9.14 13.99 10.09 4.33 .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 MP Enclosure 3 Radiation Dose Assessment Seabrook Station Radiological Effluent Impact Assessment For 2011 (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 Total Body 1.5 mrem 3 mrem (10CFR50, APP. I) Max. Organ 5 mrem 10 mrem NOBLE GAS Gamma Air 5 mrad 10 mrad (IOCFR50, 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)

Thyroid[liquids, gas, direct] 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 2011 were calculated in accordance with Method II as defined in the Station ODCM. 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, Carbon-14 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 from fixed radiation AREVA Doc# 47-9181394-000 I

sources from both plant operations and dry fuel storage were 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 (per the ODCM) 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 2011 reporting period are well below the dose criteria of 10 CFR Part 50, 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 liquid and gaseous effluents and direct radiation from fixed plant and dry fuel storage sources was below the dose standards of 40 CFR Part 190.2 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 1 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 (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 1/2) and their radioactive decay constants (Q) 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 IIl. 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/Qs and assume 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/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 (Reference 4). 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 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

[V. Method for Calculating the Critical Organ Dose Resulting from Iodines, Tritium, Carbon-14 and Particulates with T 1/2 Greater than 8 Days in Gaseous Releases Regulatory Guide 1.109 (Reference

1) dose models are applied in the calculation of the critical organ doses from lodines, Tritium, Carbon-14 and particulate radionuclides released into the atmosphere during the 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) 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 2011 Annual Land Use Census as required by ODCM Control C.9.2.1 (see Table F). Conservatism in the dose estimates was maintained by assuming that the vegetable garden pathway was active at each milk animal location.

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.

In June 2009, the NRC issued Revision 2 of Regulatory Guide 1.21 (Reference

7) which introduced the term "principal radionuclide" in a risk informed or dose context. A radionuclide can be considered a principal radionuclide if it contributes either (1) greater than 1 percent of the 10 CFR Part 50, Appendix I design objective dose for all radionuclides in the type of effluent being considered, or (2) greater than 1 percent of the activity of all radionuclides in the type of effluent being considered.

In addition to natural production in the environment, Carbon-14 is also produced in nuclear reactors as a function of power output, but at amounts much less than those generated naturally or from past weapons testing. Since the time of the earlier publication of Regulatory Guide 1.21 (Revision

1) in 1974, commercial nuclear power plants have decreased total radioactive effluents (other than Carbon-14) through improved fuel performance and waste management practices to the point today that Carbon-14 could be considered a principal radionuclide under today's definition, and therefore has been included in the assessment of dose to the public from gaseous effluent releases for 2011.The primary exposure pathways associated with Carbon-14 include inhalation and ingestion of food products that have incorporated Carbon-14 (in the form of C0 2) via photosynthesis.

A full year's consumption of food products are assumed to be grown from the highest impacted garden during the growing season (2 nd and 3 rd quarters).

It is also assumed that the garden grows sufficient mass to support ingestion throughout the year (i.e., the annual dose to the individual is from consumption during all four quarters).

The maximum organ doses from all radionuclides in this category of gaseous effluents were determined by summing the contributions from all exposure pathways at each location, and sorting in descending order.5 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 at the location of the maximally exposed individual are reported in Table A.The estimated organ doses from lodines, Tritium, Carbon-14 and Particulates in gaseous effluents are well below the 10 CFR Part 50, Appendix I dose criteria for the reporting period. (See Table C for calculated dose as a percentage of annual limits.)6 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 station fixed sources to the maximum receptor location.

This includes the addition of spent fuel storage in a new Dry Fuel Storage (DFS) facility that began operations in July 2008 with the first transfer of spent fuel assemblies into storage arrays. The DFS facility is located on Seabrook Station property approximately 0.38 miles West-Southwest of the Unit 1 Containment Building.

Since there are no other uranium fuel cycle facilities within five miles of Seabrook Station, 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 plant and dry fuel storage fixed sources, was 7.80E-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 2.74E-01 mrem.Table B illustrates the total dose projections from all station sources to the maximum potential off-site individual for the year 2011 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.)7 VI. References

1. Regulatory Guide 1.109, Revision ],"Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purposes of Evaluating Compliance with 1OCFR Part 50, Appendix I", USNRC, October 1977.2. Seabrook Station Program Manual: Offsite Dose Calculation Manual (ODCM), Revision 36.3. 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. Regulatory Guide 1.21, Revision 2, "Measuring, Evaluating, and Reporting Radioactive Material in Liquid and Gaseous Effluents and Solid Waste", USNRC, June 2009.8 Table A Seabrook Station 2011 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 2011 Liquid Effluents:

Total Body Dose 3.54E-04 2.17E-03 1.27E-05 2.50E-05 2.56E-03 (1) (1) (1) (1)Organ Dose 4.02E-04 3.07E-03 4.76E-05 5.96E-05 3.58E-03 (2) (2) (3) (3)Airborne Effluents:

Organ Dose from Carbon-14, Jodines, 6.12E-02 7.13E-02 6.62E-02 7.13E-02 2.70E-01 Tritium, and Particulates (T 1/2 > 8 days) (4) (4) (4) (4)Noble Gases Beta Air 6.67E-04 3.40E-05 2.83E-07 5.52E-05 7.56E-04 (mrad) (5) (6) (7) (8)Gamma Air 9.28E-04 7.18E-05 8.49E-07 1.11E-04 1.11E-03 (mrad) (5) (6) (7) (8)Direct Dose Offsite From Station Operation(e)

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

Science and Nature Center (SW, 488m): 9.81E-07 1.86E-05 5.39E-06 1.12E-05 3.62E-05 Organ Dose (mrem) (dl) (dl) (dl) (dl)The "Rocks" (NE/ENE, 244m): 1.25E-04 2.1 1E-04 5.04E-04 1.33E-03 2.17E-03 Organ Dose (mrem) (dl) (dl) (dl) (dl)9 Table A (continued)

Seabrook Station 2011 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 1OCFR50, 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) Liver of an Adult (3) GI-LLI of an adult (4) Bone of a child, SW 1130 m (5) WSW 1022 m (6) ENE 2276 m (7) W 974 m (8) E 2438 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 I OCFR50.(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., 0.00 14 for the Science and Nature Center and 0.0076 for the "Rocks").Where appropriate, the numbered footnotes indicate the organ and age group of the dose receptor: (dl) Bone of a teen (e) Only station sources (both plant and dry fuel storage) are considered since there are no other fuel cycle facilities within five miles of Seabrook Station site. Dosimeter data collected in 2011 for the closest off-site environmental TLD locations in each sector (as listed in Tables B.4-1 and B.4-2 of Seabrook's ODCM) were compared to preoperational data for the same locations.

No statistical difference above random background variability which could be attributed to station sources was identified.

10 Table B Seabrook Station 2011 Annual Radioactive Effluent Release Report Total Dose to Maximum Off-Site Individual (40CFR190)

Release Source Total Body Maximum Organ a)(mrem) (mrem)Liquids 2.56E-03 3.58E-03 Noble Gases 7.40E-04 7.40E-04 Gaseous Iodines, Tritium, C-14 &7.47E-02 2.70E-01 Particulates (TI/2 > 8 days)Direct Radiation 0 0 Annual Total 7.80E-02 2.74E-01 (a) Maximum organ includes consideration of the thyroid.11 Table C Seabrook Station 2011 Annual Radioactive Effluent Release Report Calculated 2011 Maximum Doses versus Applicable Limits Applicable ODCM Calculated Percent ODCM Annual Annual (2011) of Receptor Control Limit Dose Limit Offsite Liquid Effluents Whole Body Dose C.6.2.1 3 mrem 2.56E-03 mrem 0.0854%Organ Dose C.6.2.1 10 mrem 3.58E-03 mrem 0.0358%Airborne Effluents Organ Dose (iodines, H-3, C-14 and part.) C.7.3.1 15 mrem 2.70E-01 mrem 1.80%Gamma Air Dose (noble gases) C.7.2.1 10 mrad 1.11E-03 mrad 0.0111%Beta Air Dose (noble gases) C.7.2.1 20 mrad 7.56E-04 mrad 0.00378%All Station Sources (a)Whole Body Dose C.8.1.1 25 mrem 7.80E-02 mrem 0.312%Organ Dose C.8.1.1 25 mrem 2.74E-01 mrem 1.10%Onsite (Science and Nature Center, 488m SW)Airborne Effluents Organ Dose (iodines, H-3, C-14 and part.) C.7.3.1(b) 15 mrem 3.62E-05 mrem 0.00024%Onsite (The "Rocks", 244m NE/ENE)Airborne Effluents Organ Dose (iodines, H-3, C-14 and part.) C.7.3.1(b) 15 mrem 2.17E-03 mrem 0.0144%(a) The "all station sources" doses are the sum of the whole body doses and maximum organ doses from liquid, noble gas, and gaseous iodines/tritium/carbon-14/particulate releases as well as direct radiation from fixed station sources (both plant facilities and dry fuel storage).(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.12 Table D Seabrook Station 2011 Annual Radioactive Effluent Release Report Sources of the Values of Factors Used in Liquid Dose Equations Factor Definition 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-1, 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 Table A-2, Reg. Guide 1.109 (value = 0.5)13 Table E Seabrook Station 2011 Annual Radioactive Effluent Release Report Sources of Values for the Factors Used in Dose Equations for Gaseous Releases Factor Definition Source tb Period of activity buildup in sediment Table B.7-2, Station ODCM or soil ki Nuclide decay constant Kocher (Reference 3)DFGij Ground plane dose factor Table E-6, Reg. Guide 1.109 Atmospheric dispersion factor (non-depleted)

Calculated following Reg. Guide 1.111[X/Q]D Atmospheric dispersion factor (depleted)

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 p Soil surface density Table B.7-2, Station ODCM Crop, leafy vegetable, or pasture Table B.7-2, Station ODCM te grass exposure period th Average time from crop harvest to Table B.7-2, Station ODCM th consumptionTalB.-,StinO M Yv Agricultural productivity by unit area Table B.7-2, Station ODCM Fraction of deposited activity r retained on crops, leafy vegetables, or Table E-15, Reg. Guide 1.109 pasture grass Stable element transfer coefficient from soil to produce, leafy vegetable, Table E-1, Reg. Guide 1. 109 or pasture grass Fractional equilibrium ratio Reg. Guide 1.109 H Ambient absolute humidity Table B.7-2, Station ODCM 14 Table E (continued)

Seabrook Station 2011 Annual Radioactive Effluent Release Report Sources of Values for the Factors Used in Dose Equations for Gaseous Releases Factor Definition Source Stable element transfer coefficient Fm from feed to milk Tables E-1 and E-2, Reg. Guide 1.109 tf Average time from feed to milk to Reg. Guide 1.109 consumption Reg._Guide_1.109 Fraction of the year that animals Table B.7-2, Station ODCM graze on pasture Fraction daily feed pasture grass Table B.7-2, Station ODCM Stable element transfer coefficient Table E-1, Reg. Guide 1.109 from feed to meat Average time from meat animal ts slaughter to consumption Table E-15, Reg. Guide 1.109 DFIija Ingestion dose factor Tables E-1 1 through E-14, R.G.1.109 Ua Annual intake of produce 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 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 f_ leafy vegetables Reg. Guide 1.109 Rate constant for activity removal from plant and leaf surfaces by Table E-15, Reg. Guide 1.109 weathering L QF Animal consumption rate Table E-3, Reg. Guide 1.109 15 Table F Seabrook Station 2011 Annual Radioactive Effluent Release Report Receptor Locations*

for Seabrook Station Milk Animals Nearest Nearest within 5 Mile Resident Garden Radius Sector km (miles) km (miles) km (miles)N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW 2.73 (1.69)3.09 (1.92)2.92 (1.82)2.31 (1.44)2.56 (1.59)2.43 (1.51)2.36 (1.46)1.65 (1.02)1.21(0.75) 1.12 (0.69)1.13 (0.70)1.87(1.16) 1.32 (0.82)1.11 (0.69)1.22 (0.76)1.04 (0.64)3.97 (2.47)3.09 (1.92)4.20 (2.61)4.18 (2.60)1.25 (0.77)1.22 (0.76)1.72 (1.07)2.27 (1.41)2.18(1.35) 1.52 (0.94)1.18 (0.73)1.96 (1.22)4.52 (2.81)6.93 (4.30)* Locations based on 2011 Land Use Census.16 Enclosure 4 Offsite Dose Calculation Manual (ODCM)

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