ML11109A050

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Independent Spent Fuel Storage Installation, Annual Radiological Environmental Operating Report, January - December 2010
ML11109A050
Person / Time
Site: Haddam Neck  File:Connecticut Yankee Atomic Power Co icon.png
Issue date: 03/31/2011
From:
Radiological Safety & Control Services
To:
Connecticut Yankee Atomic Power Co, Office of Nuclear Material Safety and Safeguards
References
CY-11-013
Download: ML11109A050 (27)
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Text

HADDAM NECK INDEPENDENT SPENT FUEL STORAGE INSTALLATION License No. DPR-61 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT Januarv -December 2010 RSCS Radiatio' Safety & Control Services March 2011 Prepared by: Radiological Safety & Control Services 91 Portsmouth Avenue Stratham, NH 03885-2468 EXECUTIVE

SUMMARY

Connecticut Yankee's Haddam Neck facility was permanently shutdown in 1996. All fuel has been transferred into dry storage casks and placed at the Independent Spent Fuel Storage Installation.

The Radiological Environmental Monitoring Program (REMP) for the Connecticut Yankee Independent Spent Fuel Storage Installation (ISFSI) located in East Haddam, CT was continued for the period January through December 2010 in compliance with the Connecticut Yankee Off-Site Dose Calculation Manual (ODCM).No changes were made to the ODCM during 2010. By design, there are no liquid or gaseous effluents associated with the operation of the ISFSI. Therefore, the ODCM only requires monitoring of direct exposure from the facility.

TLDs were used to measure direct gamma exposure at eight locations in the vicinity of the ISFSI and one control location 2.8 miles away. The results of these measurements showed no significant change in exposure rates and potential doses to members of the public during the monitoring period over the baseline measurements that were collected in 2003. The results of the monitoring performed in 2010 also show that operating the Haddam Neck ISFSI results in only a small fraction of the 40 CFR Part 190 and 10 CFR Part 72.104 direct radiation dose limit of 25 mrem/year to members of the public.Page 2 of 27 TABLE OF CONTENTS Section Title Page

1.0 INTRODUCTION

.......................................................................................

6 2.0 GENERAL ISFSI AND SITE INFORMATION

.....................................

7 3.0 PROGRAM DESIGN ...............................................................................

7 3.1 M ONrrORNG ZONES ...........................................................................................

7 3.2 PATHW AYS M ONITORED ......................................................................................

8 3.3 DEscRIPTION OF MONITORING PROGRAM .................................................................

8 4.0 RADIOLOGICAL DATA

SUMMARY

TABLES ..................................

12 5.0 ANALYSIS OF ENVIRONMENTAL RESULTS ................................

26 5.1 SAMPLING PROGRAM DEVLA41ONS

......................................................................

26 5.2 DiRECT RADtATION PATHWAY ............................................................................

26 6.0 LAND USE CENSUS ...........................................................................

27

7.0 REFERENCES

..................................................................

27 Page 3 of 27 LIST OF TABLES Table Title Page 3.1 Radiological Environmental Monitoring Program ........................

9 3.2 Radiological Environmental Monitoring Locations (TLD) ........ 10 4.1 TLD Measurements by Quarter ........................................................

13 4.2 Exposure Rates from TLD Measurements

..................................

14 4.3 TLD Data Summary ............................................................................

15 4.4 Direct Dose from ISFSI Operations

................................................

16 Page 4 of 27 LIST OF FIGURES Figure Title Paqe 3.1 Radiological Environmental Monitoring Locations

.....................

11 4.1 Exposure Rate Trend at CY-1 -IF .......................................................

17 4.2 Exposure Rate Trend at CY-6-IF .......................................................

18 4.3 Exposure Rate Trend at CY-48-IF .....................................................

19 4.4 Exposure Rate Trend at CY-52-IF .....................................................

20 4.5 Exposure Rate Trend at CY-53-IF .....................................................

21 4.6 Exposure Rate Trend at CY-54-IF .....................................................

22 4.7 Exposure Rate Trend at CY-55-IF .....................................................

23 4.8 Exposure Rate Trend at CY-56-IF .....................................................

24 4.9 Exposure Rate Trend at Control Location CY-1 0-IFC ................

25 Page 5 of 27

1.0 INTRODUCTION

This report summarizes the findings of the Radiological Environmental Monitoring Program (REMP) conducted by Connecticut Yankee in the vicinity of the Haddam Neck Independent Spent Fuel Storage Installation.

It is submitted annually in compliance with Section F, of the Off-site Dose Calculation Manual (ODCM). The remainder of this report is organized as follows: Section 2: Section 3: Section 4: Section 5: Section 6: Section 7: Provides a brief description of the Connecticut Yankee site and its environs.Provides a description of the overall REMP design. This section includes a summary of the ODCM requirements for REMP sampling, tables listing TLD monitoring locations with compass sectors and distances from the ISFSI Pad, and maps showing the location of each of the TLD monitoring locations.

Provides a complete set of TLD data showing measured results (mR), TLD data converted to exposure rates (pR per hour) and calculated doses (mrem per year). This section also provides the summarized exposure rate data in the format specified by the NRC Branch Technical Position on Environmental Monitoring (Reference 1).Provides the results of the monitoring program. The performance of the program in meeting ODCM requirements is discussed, and the data acquired during the year is analyzed.Provides the status of the Land Use Census.References Page 6 of 27 2.0 GENERAL ISFSI AND SITE INFORMATION The Haddam Neck ISFSI site is located in the town of East Haddam, Middlesex County, Connecticut, at a point 22 miles south-southeast of Hartford, Connecticut; 25 miles northeast of New Haven, Connecticut; and 16 miles north of Long Island Sound. The site is situated on the east bank of the Connecticut River at an area known as Haddam Neck. The elevation of the site property varies from 10 to 300 feet above sea level, with the area occupied by the ISFSI Pad ranging between 45 and 50 feet above sea level.The former plant was designed as a single unit pressurized water reactor which sustained its initial chain reaction in July 1967, with commercial operation beginning in January 1968 and a gross power output of 590 Mw (e). After 28 years of operation, the Connecticut Yankee Board of Directors voted in 1996 to permanently close and decommission the power plant. Following two years of planning and preparation, actual decommissioning began in 1998 and was completed in 2006.This site now consists of the Independent Spent Fuel Storage Installation where the fuel from the former plant reactor is stored.The Radiological Environmental Monitoring Program (REMP) for the ISFSI began pre-operational direct radiation measurements in 2003 prior to the initial spent fuel transfer to the ISFSI. The ISFSI REMP has been in continuous operation since this transfer began.3.0 PROGRAM DESIGN The Radiological Environmental Monitoring Program (REMP) for the Haddam Neck ISFSI was designed to provide assurance to regulatory agencies and the public that the station's environmental impact is known and within anticipated limits. The direct dose limit for members of the public from operation of the ISFSI is 25 mrem per year (References 3 and 4).The detailed sampling requirements of the REMP are given in the ODCM. The sampling requirements specified in the ODCM are summarized in Table 3.1 of this report. Details of the monitored locations are shown in Table 3.2, as well as Figure 3.1 of this report.Page 7 of 27 3.1 Monitoring Zones The REMP is designed to allow comparison of levels of radioactivity in samples from the area possibly influenced by the ISFSI to levels found in areas not influenced by the ISFSI. The first area is called "indicator stations".

The second area is called"control stations".

The distinction between the two is based on relative direction from the facility and distance.

Analysis of survey data from the two zones aids in determining if there is a significant difference between the two areas. It can also help in differentiating between radioactivity or radiation due to releases and that due to other fluctuations in the environment, such as seasonal variations in the natural background.

3.2 Pathways Monitored Based on the design of the ISFSI, only the direct radiation exposure pathway is monitored by the REMP. This pathway is monitored by the collection of thermoluminescent dosimeters (TLDs) which are described in more detail below.3.3 Description of the Monitoring Program 3.3.1 Direct Radiation Direct gamma radiation exposure was continuously monitored during 2010 with the use of thermoluminescent dosimeters (TLDs). At each monitoring location, these TLDs are sealed in plastic bags and attached to an object such as a tree, fence or utility pole. The TLDs are posted and retrieved on a quarterly basis. All TLDs are provided and processed by a National Voluntary Laboratory Accreditation Program (NVLAP) certified vendor. The TLDs are placed at various locations around the Independent Spent Fuel Storage Installation (ISFSI). Table 3.2 lists the Station ID Codes, distances and direction of the TLDs from the ISFSI.3.3.2 Special Monitoring Special samples are taken that are not required in the ODCM. The sample locations do not appear in Table 3.1 or 3.2 of this report. Three Dibble Creek Sediment samples, three ISFS1 Outfall soil samples and three ISFSI Runoff water samples were collected during this period. The results of these samples are available for review at the site.Page 8 of 27 Table 3.1 Radiological Environmental Monitoring Program Exposure Collection Analysis Pathway Number of Routine Pathway Number of aoine Collection Analysis Analysis Sample Sample Sampling Frequency Type Frequency Media Locations Mode Direct Total Locations:

9 Continuous Quarterly Gamma Each TLD Radiation (8 around dose (TLD) perimeter of the site and I offsite control location)Page 9 of 27 Table 3.2 Radiological Environmental Monitoring Locations (TLD)Station Code CY-1 0-IFC CY-1 -IF CY-6-IF CY-48-IF CY-52-IF CY-53-IF CY-54-IF CY-55-IF CY-56-IF Station Description Hurd Park Road (O)*Distance Zone From ISFSI (miles)2 2.8 Direction From ISFSl NNW Mouth of Discharge Canal (l)**Substation (I)**Near Historical Met Tower Shack (l)**Schmidt Cemetery (l)**ISFSI Haul Route (I)**Rt 149 Near Mouth of Salmon River (I)**High Voltage Tower- NW of Pad (I)**Near Historical Burrow Pit (I)**1 1 1 1 1 1 1 0.5 0.6 0.4 0.5 0.2 1.0 0.4 0.2 SSE NW WSW NNE SSW ESE NW E*2 = Control TLD;1 =Indicator TLD**I = Inner Ring TLD; 0 = Outer Ring TLD Page 10 of 27 Figure 3.1 Radiological Environmental Monitori!Page 11 of 27 4.0 RADIOLOGICAL DATA

SUMMARY

TABLES This section summarizes the analytical results of the environmental samples, which were collected during the monitoring period.Data from direct radiation measurements made by TLDs are provided in Table 4.1.The direct measurements converted to exposure rates are provided in Table 4.2.The summarized exposure rate results, shown in Table 4.3, are presented in a format similar to that prescribed in the NRC's Radiological Assessment Branch Technical Position on Environmental Monitoring (Reference 1). Table 4.4 provides the estimated direct dose from ISFSI operations as determined by TLDs.Page 12 of 27 Table 4.1 TLD Measurements by Quarter (mR)Station ID CY-1 -IF CY-6-IF CY-48-IF CY-52-IF CY-53-IF CY-54-IF CY-55-IF CY-56-IF CY-1 0-IFC CY-1 0-IFCa Direction SSE NW WSW NNE SSW ESE NW E 1st Qtr 26 25 24 26 30 26 28 27 2nd Qtr 24 25 25 25 26 26 26 26 3rd Qtr 22 20 20 23 27 23 24 24 4th Qtr 27 26 24 29 32 28 30 28 Control Control Backup 30 29 25 25 23 21 30 29 Page 13 of 27 Table 4.2 Exposure Rates from TLD Measurements (pR per hour)Station ID CY-1 -IF CY-6-IF CY-48-IF CY-52-IF CY-53-IF CY-54-IF CY-55-IF CY-56-IF CY-1 0-IFC Direction SSE NW WSW NNE SSW ESE NW E Control 1st Qtr 6.1 5.6 5.2 6.1 7.8 6.1 7.0 6.5 7.6 2nd Qtr 3.2 3.7 3.7 3.7 4.2 4.2 4.2 4.2 3.7 3rd Qtr 5.0 4.1 4.1 5.4 7.3 5.4 5.9 5.9 5.0 4th Qtr 4.8 4.4 3.5 5.6 6.9 5.2 6.1 5.2 5.9 Annual Ave 4.8 4.4 4.1 5.2 6.6 5.2 5.8 5.5 5.5 Page 14 of 27 Table 4.3 TLD Data Summary (pR per hour)Indicator TLDs Control TLDs Station With Highest Mean Mean Mean Station # Mean (Range) (Range) (Range)(No. Measurements)* (No. Measurements)* (No. Measurements)*

5.2 5.5 CY-53-IF 6.6 (3.2-7.8)

(3.7-7.6)

(4.2-7.8)(32) (8) (4)* Each "measurement" is based on quarterly readings Page 15 of 27 Table 4.4 Direct Dose from ISFSI Operations (mrem)Q1 Q2 Q3 Q4 NetTLD Calculated NetTLD Calculated NetTLD Calculated NetTLD Calculated Annual Station ID Result Dose Result Dose Result Dose Result Dose Dose CY-1 -IF 0.0 0.00 0.0 0.00 0.0 0.00 0.0 0.00 0.00 CY-6-IF 0.0 0.00 0.0 0.00 0.0 0.00 0.0 0.00 0.00 CY-48-IF 0.0 0.00 0.0 0.00 0.0 0.00 0.0 0.00 0.00 CY-52-IF 0.0 0.00 0.0 0.00 1.0 0.09 0.0 0.00 0.09 CY-53-IF 0.5 0.01 1.0 0.09 5.0 0.46 2.5 0.06 0.62 CY-54-IF 0.0 0.00 1.0 0.09 1.0 0.09 0.0 0.00 0.18 CY-55-IF 0.0 0.00 1.0 0.09 2.0 0.18 0.5 0.01 0.29 CY-56-IF 0.0 0.00 1.0 0.09 2.0 0.18 0.0 0.00 0.27 Max Dose =>0.62 NOTES: 1. Doses based on a 50 hour5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> occupancy in both of the first and fourth quarters and a 200 hour0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> occupancy in both of the second and third quarters.2. Some of the net TLD results were negative and rounded up to zero.Page 16 of 27 Figure 4.1 Exposure Rate Trend at CY-1 -IF Indicator Locations

-CV- 1-IF REMP TLD [Exposure Ratel 7 00+000 2,00e+000

-V /5.00e.OM 000~e+ow Result -Discrimination LevelI Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-1-IF-001 06/30/2003 5.5E+000 pR/h t 7.60E-001 2.5E+000 CY-1-IF-002 09/30/2003 5.9E+000 MR/h t

  • 5.60E-001 2.5E+000 CY-1-IF-003 12/31/2003 5.8E+000 pR/h t
  • 3.OOE-001 2.5E+000 CY-1-IF-004 03/31/2004 5.7E+000 pR/h t
  • 4.80E-001 2.5E+000 CY-1-IF-005 06/30/2004 5.7E+000 MR/h t
  • 8.20E-001 2.5E+000 CY-1-IF-006 09/30/2004 6.OE+000 MR/h t
  • 8.80E-001 2.5E+000 CY-1-IF-007 12/31/2004 5.3E+000 R/h t
  • 3.40E-001 2.5E+000 CY-1-IF-008 03/31/2005 5.6E+000 pR/h t
  • 5.20E-001 25E+000 CY-1-IF-010 09/30/2005 6.3E+000 R/h "t
  • 7.40E-001 2.5E+000 CY-1-IF-011 12/31/2005 6.4E+000 pR/h t 7.OOE-001 2.5E+000 CY-1-IF-012 03/31/2006 5.4E+000 pR/h t
  • 6.60E-001 2.5E+000 CY-1-IF-013 06/30/2006 7.OE+000 pR/h t
  • 9.80E-001 2.5E+000 CY-1-IF-014 09/30/2006 5.3E+000 MR/h t
  • 6.80E-001 2.5E+000 CY-1-IF-015 12/31/2006 6.1E+000 MR/h t
  • 5.OOE-001 2.5E+000 CY-1-IF-016 03/31/2007 6.IE+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-1-IF-017 06/30/2007 6.8E+000 JR/h t
  • 6.80E-001 2.5E+000 CY-1-IF-018 09/30/2007 6.4E+000 MR/h t
  • 6.40E-001 2.5E+000 CY-1-IF-019 12/31/2007 6.5E+000 MR/h t
  • 6.60E-001 2.5E+000 CY-1-IF-020 03/31/2008 6.5E÷000 MR/h t
  • 6.60E-001 2.5E+000 CY-1-IF-021 06/30/2008 5.1 E+000 MR/h t
  • 5.OOE-001 2.5E+000 CY-1-IF-022 09/30/2008 6.2E+000 R/h "t
  • 6.20E-001 2.5E+000 CY-1-IF-023 12/31/2008 4.4E+000 "h /
  • 4.40E-001 2.5E+000 CY-1-IF-024 03131/2009 6.6E+000 MR/h f
  • 6.OOE-001 2.5E+000 CY-1-IF-025 06/30/2009 5.2E+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-1-IF-026 09/30/2009 4.4E+000 MR/h t
  • 4.OOE-001 2.5E+000 CY-1-IF-027 12/31/2009 4.6E+000 MR/h t
  • 4.OOE-001 2.5E+000 CY-1-IF-028 03/31/2010 6.IE+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-1-IF-029 06/30/2010 3.2E+000 MR/h t
  • 4.OOE-001 2.5E+000 CY-1-IF-030 09/30/2010 5.0E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-1-IF-031 12/31/2010 4.8E+000 R/h
  • 4.OOE-001 2.5E+000 Results marked with are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 17 of 27 Figure 4.2 Exposure Rate Trend at CY-6-1F Indicator Locations

-CY-6-IF: REMP TLD [Exposure Rate]&ooe+o00w 7 cx~e+=o S /Result IDiscrimination LevlI Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-6-IF-001 06/30/2003 6.1E+000 JR/h t

  • 6.20E-001 2.5E+000 CY-6-IF-002 09/30/2003 6.5E+000 pR/h t
  • 5.OOE-001 2.5E+000 CY-6-IF-003 12/31/2003 6.1E+000 JR/h t
  • 4.OOE-001 2.5E+000 CY-6-IF-004 03/31/2004 6.2E+000 liR/h t
  • 6.60E-001 2.5E+000 CY-6-IF-005 06/30/2004 6.IE+000 jR/h t 1 .06E+000 2.5E+000 CY-6-IF-006 09130/2004 5.6E+000 jR/h t
  • 4.80E-001 2.5E+000 CY-6-IF-007 12/31/2004 5.8E+000 JR/h t
  • 3.OOE-001 2.5E+000 CY-6-IF-008 03/31/2005 5.5E+000 jR/h t
  • 5.20E-001 2.5E+000 CY-6-IF-009 06/30/2005 5.8E+000 MR/h t
  • 5.60E-001 2.5E+000 CY-6-IF-010 09/30/2005 6.5E+000 ,R/h t
  • 8.80E-001 2.5E+000 CY-6-IF-011 12/31/2005 6.9E+000 jR/h t
  • 9.OOE-001 2.5E+000 CY-6-IF-012 03/31/2006 6.2E+000 R/h "t
  • 4.20E-001 2.5E+000 CY-6-IF-013 06/30/2006 6.5E+000 JR/h t
  • 5.60E-001 2.5E+000 CY-6-IF-014 09/30/2006 5.6E+000 R/h t 5.60E-001 2.5E+000 CY-6-IF-015 12/31/2006 6.5E+000 JR/h t
  • 6.OOE-001 2.5E+000 CY-6-IF-016 03/31/2007 7.6E+000 jR/h t
  • 7.60E-001 2.5E+000 CY-6-IF-017 06/30/2007 6.8E+000 MR/h t
  • 6.80E-001 2.5E+000 CY-6-IF-018 09/30/2007 6.9E+000 jR/h t
  • 6.80E-001 2.5E+000 CY-6-IF-019 12/31/2007 6.5E+000 MR/h t
  • 6.60E-001 2.5E+000 CY-6-IF-020 03/31/2008 7.5E+000 jR/h t
  • 7.60E-001 2.5E+000 CY-6-IF-021 06/30/2008 5.IE+000 MR/h t
  • 5.OOE-001 2.5E+000 CY-6-IF-022 09/30/2008 4.5E+000 MR/h t
  • 4.40E-001 2.5E+000 CY-6-1F-023 12/31/2008 5.OE+000 MR/h t
  • 5.OOE-001 2.5E+000 CY-6-IF-024 03/31/2009 6.6E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-6-IF-025 06/30/2009 5.2E+000 MJR/h t
  • 6.OOE-001 2.5E+000 CY-6-IF-026 09/30/2009 4.4E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-6-IF-027 12/31/2009 5.1E+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-6-IF-028 03/31/2010 5.6E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-6-IF-029 06/30/2010 3.7E+000 MR/h t
  • 4.O0E-001 2.5E+000 CY-6-IF-030 09/30/2010 4.1 E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-6-IF-031 12/31/2010 4.4E+000 MR/h t
  • 4.OOE-001 2.5E+000 Results marked with are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 18 of 27 Figure 4.3 Exposure Rate Trend at CY-48-IF Indicator Locations

-CY-48-IF:

REMP TLD [Exposure Rate]&Oot.OOO 7 01e+OOO41 200" S OO/ / O \ / \1 we+OM ~000e+000--Result -Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-48-IF-001 06/30/2003 5.7E+000 pR/h t

  • 5.40E-001 2.5E+000 CY-48-IF-002 09/30/2003 5.8E+000 pR/h t
  • 4.60E-001 2.5E+000 CY-48-IF-003 12/31/2003 6.1E+000 pR/h t
  • 4.20E-001 2.5E+000 CY-48-IF-004 03/31/2004 5.5E+000 pR/h t
  • 1 .00E+000 2.5E+000 CY-48-IF-005 06/30/2004 5.7E+000 pR/h t
  • 9.60E-001 2.5E+000 CY-48-IF-006 09/30/2004 5.6E+000 pR/h t
  • 5.20E-001 2.5E+000 CY-48-IF-007 12/31/2004 6.5E+000 pR/h t
  • 7.20E-001 2.5E+000 CY-48-IF-010 09/30/2005 7.2E+000 pR/h t
  • 7.80E-001 2.5E+000 CY-48-IF-011 12/31/2005 6.7E+000 pR/h t
  • 9.40E-001 2.5E+000 CY-48-IF-012 03/31/2006 5.2E+000 pR/h t
  • 1 .OOE+000 2.5E+000 CY-48-IF-013 06/30/2006 5.7E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-48-IF-014 09/30/2006 5.1 E+000 pR/h t
  • 5.20E-001 2.5E+000 CY-48-IF-015 12/31/2006 4.8E+000 pR/h t
  • 4.20E-001 2.5E+000 CY-48-IF-016 03/31/2007 5.7E+000 pR/h t
  • 5.60E-001 2.5E+000 CY-48-IF-017 06/30/2007 5.7E+000 PR/h t
  • 5.80E-001 2.5E+000 CY-48-IF-018 09/30/2007 6.9E+000 pR/h t
  • 6.80E-001 2.5E+000 CY-48-IF-019 12/31/2007 6.1 E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-48-IF-020 03/31/2008 6.5E+000 pR/h t
  • 6.60E-001 2.5E+000 CY-48-IF-021 06/30/2008 5.5E+000 pR/h t
  • 5.60E-001 2.5E+000 CY-48-IF-022 09/30/2008 6.2E+000 pR/h t
  • 6.20E-001 2.5E+000 CY-48-IF-023 12/31/2008 4.4E+000 pR/h t
  • 4.40E-001 2.5E+000 CY-48-IF-024 03/31/2009 6.6E+000 pR/h t
  • 6.00E-001 2.5E+000 CY-48-IF-025 06/30/2009 5.2E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-48-IF-026 09/30/2009 4.8E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-48-IF-027 12/31/2009 3.7E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-48-IF-028 03/31/2010 5.2E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-48-IF-029 06/30/2010 3.7E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-48-IF-030 09/30/2010 4.1E+000 pR/h t
  • 4.00E-001 2.5E+000 CY-48-IF-031 12/31/2010 3.5E+000 pR/h t
  • 4.OOE-001 2.5E+000 Results marked with are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Paae 19 of 27 Figure 4.4 Exposure Rate Trend at CY-52-IF Indicator Locations

-CY-52-IF:

REMP TLD (Exposure Rate]7 00e+=o 1aae+ODD 4.a00"M 2 00e+ODO-- Result Discrimination Leve, Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-52-IF-001 06/30/2003 6.4E+000 pR/h t

  • 9.OOE-001 2.5E+000 CY-52-IF-002 09/30/2003 6.5E+000 pR/h t
  • 4.60E-001 2.5E+000 CY-52-IF-003 12/3112003 6.5E+000 pR/h t
  • 4.60E-001 2.5E+000 CY-52-IF-004 03/31/2004 5.8E+000 pR/h t
  • 6.20E-001 2.5E+000 CY-52-IF-005 06/30/2004 6.6E+000 pR/h t
  • 8.80E-001 2.5E+000 CY-52-IF-006 09/30/2004 6.1 E+000 pR/h t
  • 5.20E-001 2.5E+000 CY-52-IF-007 12131/2004 6.5E+000 pR/h t
  • 7.20E-001 2.5E+000 CY-52-IF-008 03/31/2005 5.6E+000 pR/h t
  • 5.OOE-001 2.5E+000 CY-52-IF-009 06/30/2005 6.2E+000 pR/h t
  • 4.60E-001 2.5E+000 CY-52-IF-010 09/30/2005 7.2E+000 pR/h t
  • 8.80E-001 2.5E+000 CY-52-IF-011 12/31/2005 6.6E+000 pR/h t
  • 7.60E-001 2.5E+000 CY-52-IF-012 03131/2006 5.9E+000 pR/h t
  • 3.80E-001 2.5E+000 CY-52-IF-013 06/30/2006 6.6E+000 pR/h t
  • 1.02E+000 2.5E+000 CY-52-IF-014 09/30/2006 6.4E+000 pR/h t
  • 1.24E+000 2.5E+000 CY-52-IF-015 12/31/2006 6.3E+000 pR/h t
  • 6.80E-001 2.5E+000 CY-52-IF-016 03/31/2007 7.6E+000 MR/h t
  • 7.60E-001 2.5E+000 CY-52-IF-017 06/30/2007 7.3E+000 pR/h t
  • 7.20E-001 2.5E+000 CY-52-IF-018 09/30/2007 6.9E+000 pR/h t
  • 6.80E-001 2.5E+000 CY-52-IF-019 12/31/2007 6.9E+000 pR/h t
  • 7.OOE-001 2.5E+000 CY-52-IF-020 03/31/2008 7.OE+000 pR/h t
  • 7.OOE-001 2.5E+000 CY-52-IF-021 06/30/2008 5.9E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-52-IF-022 09/30/2008 5.3E+000 MR/h t
  • 5.40E-001 2.5E+000 CY-52-IF-023 12/31/2008 5.OE+000 pR/h t
  • 5.OOE-001 2.5E+000 CY-52-IF-024 03/31/2009 7.6E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-52-IF-025 06/30/2009 7.5E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-52-IF-026 09/30/2009 4.4E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-52-IF-027 12/31/2009 4.2E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-52-IF-028 03/31/2010 6.1E+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-52-IF-029 06/30/2010 3.7E+000 MR/h t
  • 4.OOE-001 2.5E+000 CY-52-IF-030 09/30/2010 5.4E+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-52-IF-031 12/31/2010 5.6E+000 pR/h t
  • 6.OOE-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 20 of 27 Figure 4.5 Exposure Rate Trend at CY-53-IF Indicator Locations

-CY-53-IF : REMP TLD [Exposure Rate]I,00"-00 I OOe+=1 6 OOe+OID A ooe+oe Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-53-IF-001 06/30/2003 6.6E+000 pR/h t

  • 6.60E-001 2.5E+000 CY-53-IF-002 09/30/2003 7.1 E+000 pR/h t
  • 4.60E-001 2.5E+000 CY-53-IF-003 12/31/2003 6.8E+000 pR/h t
  • 4.00E-001 2.5E+000 CY-53-1F-004 03/31/2004 6.6E+000 pR/h t
  • 5.20E-001 2.5E+000 CY-53-IF-005 06/30/2004 7.2E+000 pR/h t
  • 1.00E+000 2.5E+000 CY-53-IF-006 0913012004 6.7E+000 pR/h t
  • 6.60E-001 2.5E+000 CY-53-IF-007 12/31/2004 7.5E+000 pR/h t
  • 3.60E-001 2.5E+000 CY-53-IF-008 03/31/2005 6.2E+000 pIR/h t
  • 7.20E-001 2.5E+000 CY-53-IF-009 06130/2005 7.IE+000 pR/h t
  • 1.08E+000 2.5E+000 CY-53-IF-010 09/30/2005 7.5E+000 pR/h t
  • 8.20E-001 2.5E+000 CY-53-IF-011 12/3112005 7.7E+000 pR/h t
  • 1.04E+000 2.5E+000 CY-53-IF-012 03/31/2006 6.7E+000 liR/h t
  • 4.20E-001 2.5E+000 CY-53-IF-013 06/30/2006 6.1 E+000 hR/h t
  • 6.00E-001 2.5E+000 CY-53-IF-014 09/30/2006 7.6E+000 pR/h t
  • 8.60E-001 2.5E+000 CY-53-IF-015 12/31/2006 6.9E+000 hR/h t
  • 5.80E-001 2.5E+000 CY-53-IF-016 03/31/2007 6.8E+000 IR/h t
  • 6.80E-001 2.5E+000 CY-53-IF-017 06/30/2007 7.8E+000 IR/h t
  • 7.80E-001 2.5E+000 CY-53-IF-018 09/30/2007 7.8E+000 pR/h t
  • 7.80E-001 2.5E+000 CY-53-IF-019 12/31/2007 8.2E+000 pR/h t
  • 8.20E-001 2.5E+000 CY-53-IF-020 03/31/2008 8.OE+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-53-IF-021 06/30/2008 5.9E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-53-IF-022 09/30/2008 7.4E+000 pR/h t
  • 7.40E-001 2.5E+000 CY-53-IF-023 12/31/2008 6.IE+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-53-IF-024 03/31/2009 8.1E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-53-IF-025 06/30/2009 7.OE+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-53-IF-026 09/30/2009 3.9E+000 pR/h t
  • 4.00E-001 2.5E+000 CY-53-IF-027 12/31/2009 4.6E+000 pR/h t* 4.OOE-001 2.5E+000 CY-53-1F-028 03/31/2010 7.8E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-53-IF-029 06/30/2010 4.2E÷000 MR/h t
  • 4.OOE-001 2.5E+000 CY-53-IF-030 09/30/2010 7.3E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-53-IF-031 12/31/2010 6.9E+000 pR/h t
  • 6.OOE-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 21 of 27 Figure 4.6 Exposure Rate Trend at CY-54-IF Indicator Locations

-CY-54-IF:

REMP TID [Exposure Rate]-_OoM 700E+OD0/ / / / X / /WOODm4 S Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-54-1F-001 06/30/2003 7.3E+000 pR/h

  • 7.40E-001 2.5E+000 CY-54-1F-002 09/30/2003 7.7E+OO0 MR/h t *6.80E-001 2.5E+000 CY-54-1F-003 12/31/2003 7.5E+0O0 pR/h t
  • 5.20E-001 2.5E+000 CY-54-1F-004 03/31/2004 7.2E+000 MR/h t *4.60E-001 2.5E+000 CY-54-1F-005 06/30/2004 7.0E+000 MR/h t
  • 94OE-001 2.5E+000 CY-54-IF-006 09/30/2004 7.9E+000 hR/h t"
  • 1 .40E+000 2.5E+000 CY-54-1F-007 12/31/2004 8.IE+000 pR/h t *5.00E-001 2.5E+000 CY-54-1F-008 03/31/2005 7.2E+000 MR/h t *1.12E+000 2.5E+000 CY-54-1F-01 0 09/30/2005 7.0E+000 MR/h t
  • 1 .02E+000 2.5E+000 CY-54-1F-011 12/31/2005 6.8E+O00 MR/h t
  • 8.00E-001 2.5E+000 CY-54-1F-012 03/31/2006 6.2E+OO0 MR/h t
  • 4.40E-001 2.5E+000 CY-54-1F-013 06/30/2006 6.8E+000 MR/h t *7.60E-001 2.5E+000 CY-54-1F-014 09/30/2006 6.7E+O00 MR/h t *7.60E-001 2.5E+000 CY-54-1F-015 12/31/2006 6.6E+O00 MR/h t °5.40E-001 2.5E+000 CY-54-1F-016 03/31/2007 6.8E+000 MR/h t
  • 6.80E-001 2.5E+000 CY-54-1F-017 06/30/2007 6.2E+000 MR/h t
  • 6.20E-001 2.5E+000 CY-54-1F-018 09/30/2007 7.3E+OO0 MR/h t *7.40E-001 2.5E+000 OY-54-1F-019 12/31/2007 7.4E+000 MR/h t *7.40E-001 2.5E+000 CY-54-1F-020 03/31/2008 7.5E+000 PR/h t *7.60E-001 2.5E+000 CY-54-1F-021 06/30/2008 6.3E+000 MR/h t *6.40E-001 2.5E+000 CY-54-1F-022 09/30/2008 7.0E+000 MJR/h t *7.00E-001 2.5E+000 CY-54-1F-023 12/31/2008 5.5E+00O PR/h t. 5.60E-001 2.5E+000 CY-54-1F-024 03/31/2009 7.6E÷0O0 PR/h 1"t 8.OOE-001 2.5E+000 CY-54-1F-025 06/30/2009 6.1 E+000 MR/h t.
  • 6O00E-001 2.5 E+000 CY-54-1F-026 09/30/2009 4.8E÷0O0 pR/h t. 4.OOE-001 2.5E+000 CY-54-1 F-027 1 2/31/2009 5.1 E+OOO pR/h t.
  • 6.00E-001 2.5 E+000 CY-54-1F-028 03/31/2010 6.1 E÷000 pR/h t.
  • 6O00E-001 2.5E+000 CY-54-1F-029 06/30/2010 4.2E+000 MR/h t.
  • 4.00E-001 2.5E+000 CY-54-1F-030 09/30/2010 5.4E+O00 pR/h t.
  • 6.00E-001 2.5E+000 CY-54-1F-031 12/31/2010 5.2E÷0O0 pR/h t.
  • 6.00E-001 2.5E+000 Results marked with *are greater than 2 Sigma Error.Results marked with .are greater than the Discrimination Level P iae 22 of 27 Figure 4.7 Exposure Rate Trend at CY-55-IF Indicator Locations

-CY-55-IF:

REMP TLD [Exposure Rate]120e+001 1 ~Oe+001 ;/ \4o0e+woo EOoe+oo 400"M4X[~~~ ----l --- -,or --n---n..--I-elt Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-55-IF-001 06/30/2003 7.OE+000 pR/h t

  • 6.60E-001 2.5E+000 CY-55-IF-002 09/30/2003 7.2E+000 MR/h t
  • 4.40E-001 2.5E+000 CY-55-IF-003 12/31/2003 6.8E+000 pR/h t
  • 5.40E-001 2.5E+000 CY-55-IF-004 03/31/2004 6.8E+000 pR/h t
  • 1.04E+000 2.5E+000 CY-55-IF-005 06/30/2004 7.OE+O00 pjR/h t
  • 1.10E+000 2.5E+000 CY-55-IF-006 09130/2004 7.OE+000 pR/h t
  • 1.26E+000 2.5E+000 CY-55-IF-007 12/31/2004 7.2E+000 pR/h t
  • 4.40E-001 2.5E+000 CY-55-IF-008 03/31/2005 6.OE+000 MR/h t
  • 4.80E-001 2.5E+000 CY-55-IF-009 06/30/2005 7.9E+000 pR/h t
  • 1.60E+000 2.5E+000 CY-55-IF-010 09/30/2005 7.9E+000 pR/h t
  • 1.52E+000 2.5E+000 CY-55-IF-011 12/31/2005 7.5E+000 pR/h t
  • 9.OOE-001 2.5E+000 CY-55-IF-012 03/31/2006 6.7E+000 pR/h t
  • 6.40E-001 2.5E+000 CY-55-IF-013 06/30/2006 7.5E+000 pR/h t
  • 7.60E-001 2.5E+000 CY-55-IF-014 09/30/2006 6.8E+000 pR/h t
  • 7.80E-001 2.5E+000 CY-55-IF-015 12/31/2006 7.OE+000 pR/h t
  • 5.80E-001 2.5E+000 CY-55-IF-016 03/31/2007 1.1E+001 pR/h t
  • 1.08E+000 2.5E+000 CY-55-IF-017 06/30/2007 7.3E+000 pR/h t
  • 7.20E-001 2.5E+000 CY-55-IF-018 09/30/2007 7.8E+000 pR/h t
  • 7.80E-001 2.5E+000 CY-55-IF-019 12/31/2007 7.4E+000 pR/h t
  • 7.40E-001 2.5E+000 CY-55-IF-020 03131/2008 7.5E+000 pR/h t
  • 7.60E-001 2.5E+000 CY-55-IF-021 06/30/2008 7.2E+000 pR/h t
  • 7.20E-001 2.5E+000 CY-55-IF-022 09/30/2008 7.4E+000 pR/h t
  • 7.40E-001 2.5E+000 CY-55-IF-023 12/31/2008 6.IE+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-55-IF-024 03/31/2009 7.1E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-55-IF-025 06/30/2009 7.9E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-55-IF-026 09/30/2009 6.2E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-55-IF-027 12/31/2009 3.7E+000 pRIh t
  • 4.OOE-001 2.5E+000 CY-55-IF-028 03/31/2010 7.0E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-55-IF-029 06/30/2010 4.2E+000 pR/h t
  • 4.OOE-001 2.5E+000 CY-55-IF-030 09/30/2010 5.9E+000 pR/h t
  • 6.OOE-001 2.5E+000 CY-55-IF-031 12/31/2010 6.1E+000 pR/h t
  • 6.OOE-001 2.5E+000 Results marked with are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 23 of 27 Figure 4.8 Exposure Rate Trend at CY-56-IF Indicator Locations

-CY-56-IF:

REMP TLD [Exposure Rate]2A0*e+OMO 7 00e+OO 4 0054000 a o00"M 1.00"MO Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-56-IF-001 06/30/2003 6.8E+000 pR/h t

  • 7.OOE-001 2.5E+000 CY-56-IF-002 09/30/2003 7.OE+000 pR/h t
  • 4.80E-001 2.5E+000 CY-56-IF-003 12/3112003 7.OE+000 pR/h t
  • 8.00E-001 2.5E+000 CY-56-IF-004 03/31/2004 6.9E+000 pR/h t
  • 6.80E-001 2.5E+000 CY-56-IF-005 06/30/2004 6.8E+000 PR/h t
  • 1.00E+000 2.5E+000 CY-56-IF-006 09/30/2004 7.2E+000 MR/h t
  • 2.68E+000 2.5E+000 CY-56-IF-007 12/31/2004 7.0E+000 JR/h t
  • 3.40E-001 2.5E+000 CY-56-IF-008 03/31/2005 6.OE+000 MR/h t
  • 4.40E-001 2.5E+000 CY-56-IF-009 06/30/2005 7.02+000 pR/h t
  • 5.80E-001 2.5E+000 CY-56-IF-010 09/30/2005 7.1E+000 JR/h t
  • 1.10E+000 2.5E+000 CY-56-IF-011 12/31/2005 7.0E+000 JR/h t
  • 9.00E-001 2.5E+000 CY-56-IF-012 03/31/2006 6.3E+000 JR/h t
  • 6.40E-001 2.5E+000 CY-56-IF-013 06/30/2006 6.8E+000 JR/h t
  • 7.60E-001 2.5E+000 CY-56-IF-014 09130/2006 6.9E+000 MR/h t
  • 6.60E-001 2.5E+000 CY-56-IF-015 12/31/2006 6.92+000 pR/h t
  • 5.60E-001 2.5E+000 CY-56-IF-016 03131/2007 6.8E+000 pR/h t
  • 6.80E-001 2.5E+000 CY-56-IF-017 06/30/2007 7.8E+000 pR/h t
  • 7.80E-001 2.5E+000 CY-56-IF-018 09130/2007 7.8E+000 PR/h t
  • 7.80E-001 2.5E+000 CY-56-IF-019 12/31/2007 7.4E+000 pR/h t
  • 7.40E-001 2.5E+000 CY-56-IF-020 03/31/2008 8.0E+000 pR/h t
  • 8.00E-001 2.5E+000 CY-56-IF-021 06/30/2008 5.5E+000 pR/h t
  • 5.60E-001 2.5E+000 CY-56-IF-022 09/30/2008 7.0E+000 pR/h t
  • 7.OOE-001 2.5E+000 CY-56-IF-023 12/31/2008 5.5E+000 jR/h t 5.60E-001 2.5E+000 CY-56-IF-024 03131/2009 8.1E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-56-IF-025 06/30/2009 7.9E+000 MR/h t
  • 8.00E-001 2.5E+000 CY-56-IF-026 09/30/2009 6.2E+000 MR/h t
  • 6.00E-001 2.5E+000 CY-56-IF-027 12/31/2009 4.2E+000 JR/h t
  • 4.OOE-001 2.5E+000 CY-56-IF-028 03/31/2010 6.5E+000 MR/h t
  • 6.00E-001 2.5E+000 CY-56-IF-029 06/30/2010 4.2E+000 MR/h t
  • 4.00E-001 2.5E+000 CY-56-IF-030 09/30/2010 5.9E+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-56-IF-031 12/31/2010 5.2E+000 MR/h t
  • 6.OOE-001 2.5E+000 Results marked with are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Pawe 24 of 27 Figure 4.9 Exposure Rate Trend at Control Location CY-10-IFC Control Location -CY-10-IFC:

REMPTLD [Exposure Rate]-OD+M -I/Qor 2OOe+UO 10400e+2.0*+=-Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level CY-10-IFC-001 06/30/2003 6.5E+000 pR/h t

  • 7.OOE-001 2.5E+000 CY-10-IFC-002 09/3012003 6.7E+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-10-IFC-003 12/31/2003 7.2E+000 MR/h t
  • 9.OOE-001 2.5E+000 CY-10-IFC-004 03/31/2004 6.3E+000 pR/h t
  • 5.80E-001 2.5E+000 CY-10-IFC-005 06/30/2004 6.4E+000 pR/h t
  • 1.12E+000 2.5E+000 CY-10-IFC-006 09/30/2004 6.2E+000 pR/h t
  • 5.80E-001 2.5E+000 CY-10-IFC-007 12/31/2004 6.4E÷000 pR/h t
  • 3.80E-001 2.5E+000 CY-10-IFC-008 03/3112005 6.OE÷000 pR/h t
  • 6.OOE-001 2.5E+000 CY-10-IFC-009 06/3012005 6.7E÷000 pR/h t
  • 4.60E-001 2.5E+000 CY-10-IFC-010 09/30/2005 6.8E÷000 JR/h t
  • 6.60E-001 2.5E+000 CY-10-IFC-011 12/31/2005 7.8E+000 MR/h t
  • 9.OOE-001 2.5E+000 CY-10-IFC-012 03/31/2006 6.7E÷000 JR/h t
  • 5.40E-001 2.5E+000 CY-10-IFC-013 06/30/2006 7.IE+000 pR/h t
  • 5.60E-001 2.5E+000 CY-10-IFC-014 09/30/2006 6.OE+000 MR/h t
  • 5.80E-001 2.5E+000 CY-10-IFC-015 12/31/2006 6.6E+000 MR/h t
  • 7.80E-001 2.5E+000 CY-10-IFC-016 03/31/2007 6.7E+000 MR/h t
  • 6.60E-001 2.5E+000 CY-10-IFC-017 06/30/2007 6.8E+000 jR/h t
  • 6.80E-001 2.5E+000 CY-10-IFC-018 09/30/2007 6.4E+000 jR/h t
  • 6.40E-001 2.5E+000 CY-10-IFC-019 12/31/2007 7.6E+000 JR/h t
  • 7.60E-001 2.5E+000 CY-10-1FC-020 03/31/2008 8.OE+000 JR/h t
  • 8.OOE-001 2.5E+000 CY-10-IFC-021 06130/2008 6.8E+000 MR/h t
  • 6.80E-001 2.5E+000 CY-10-IFC-022 09/30/2008 6.4E+000 pR/h t
  • 6.40E-001 2.5E+000 CY-10-IFC-023 12/31/2008 4.7E+000 MR/h t
  • 4.80E-001 2.5E+000 CY-10-IFC-024 03/31/2009 7.1E+000 MR/h t
  • 8.OOE-001 2.5E+000 CY-10-IFC-025 06130/2009 6.8E+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-10-IFC-026 09/30/2009 5.8E+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-10-IFC-027 12/31/2009 5.IE+000 MR/h t
  • 6.OOE-001 2.5E+000 CY-10-IFC-028 03/31/2010 7.6E+000 pR/h t
  • 8.OOE-001 2.5E+000 CY-10-IFC-029 06/30/2010 3.7E÷000 pR/h t
  • 4.OOE-001 2.5E+000 CY-10-IFC-030 09/30/2010 5.0E÷000 pR/h t
  • 4.OOE-001 2.5E+000 CY-10-IFC-031 12/31/2010 5.9E+000 pR/h t
  • 6.OOE-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 25 of 27 5.0 ANALYSIS OF ENVIRONMENTAL RESULTS 5.1 Sampling Program Deviations A sampling program deviation is defined as samples that are unobtainable due to hazardous conditions or to malfunction of sampling equipment.

Such deviations do not compromise the program's effectiveness and in fact are considered insignificant with respect to what is normally anticipated for this Radiological Environmental Monitoring Program.No deviations of the sampling requirements occurred during this monitoring period.5.2 Direct Radiation Pathway 5.2.1 Exposure Rates Direct radiation is continuously measured at 8 indicator locations surrounding the Haddam Neck ISFSI, along with I control location (Hurd Park Road) using thermoluminescent dosimeters (TLDs). These dosimeters are collected every calendar quarter for readout at the NVLAP certified dosimetry services vendor.Review of the data in Tables 4.2 and 4.3 shows no significant difference between the indicator and control location exposure rates. Figures 4.1 through 4.9 show exposure rate trends of the monitoring locations since 2003. Review of Figures 4.1 through 4.9 shows no significant difference between the pre-operational and operational exposure rates at either the indicator or control locations.

The data listed under each of the trend graphs show values for the result errors and discrimination levels. Note that these values are estimated and are shown only for information.

5.2.2 Direct Doses from ISFSI Operations The ODCM specifies that a cumulative dose estimate from direct radiation is required to be determined semi-annually.

This dose estimate is the potential dose to any real member of the public that could use portions of the site or be present adjacent to the site for recreational activities throughout the year. The ODCM states that direct exposure above background can be estimated by subtracting the Page 26 of 27 average TLD value of the control station from the indicator location measurements.

As in previous years, the 2010 dose estimate assumes a total of 500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> occupancy for the dose calculation; of which 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> are used in both the first and fourth quarters and 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> are used in both the second and third quarters.

The most likely location for exposure to a member of the public from the ISFSI is along the Connecticut or Salmon Rivers for boating and fishing; however, the time estimates are conservatively applied to all monitoring locations.

Table 4.4 presents the results of the dose calculations.

The highest calculated dose is not along either river but at a location near the center of the site at Station ID number CY-53-1F.

The maximum calculated annual dose at that location is 0.66 mrem. This value is only 3 percent of the 25 mrem per year limit. The calculated annual dose to members of the public at the mouth of the Discharge Canal was zero. The calculated annual dose to members of the public at Route 149 near the mouth of the Salmon River was 0.23 mrem.6.0 LAND USE CENSUS The most recent census remained in effect for 2010; therefore, no changes were made to the monitoring program.

7.0 REFERENCES

1. USNRC Radiological Assessment Branch Technical Position, "An Acceptable Radiological Environmental Monitoring Program," Revision 1, November 1979.2. Haddam Neck Off-site Dose Calculation Manual, Revision 23.3. 40 CFR Part 190, "Environmental Radiation Protection Standards for Nuclear Power Operation".
4. 10 CFR Part 72.104, "Criteria for Radioactive Materials in Effluents and Direct Radiation from an ISFSI or MRS".Page 27 of 27
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