RA-10-009, Independent Spent Fuel Storage Installation - Annual Radiological Environmental Operating Report and Annual Radioactive Effluent Release Report for 2009

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Independent Spent Fuel Storage Installation - Annual Radiological Environmental Operating Report and Annual Radioactive Effluent Release Report for 2009
ML100960447
Person / Time
Site: Maine Yankee, 07100465
Issue date: 03/22/2010
From: Connell J
Maine Yankee Atomic Power Co
To:
Document Control Desk, Office of Nuclear Material Safety and Safeguards
References
MN-10-004, RA-10-009
Download: ML100960447 (30)
v • d • e


Text

Maine Yankee 321 OLD FERRY RD 9 WISCASSET, ME 04578-4922 March 22, 2010 MN- 10-004 RA- 10-009 UNITED STATES NUCLEAR REGULATORY COMMISSION Attention: Document Control Desk Washington, D. C. 20555-10001

Reference:

(a) License No. DPR-36 (Docket Nos. 50-309, 72-30 and 71-0465)

(b) Maine Yankee Quality Assurance Program (QAP)

(c) Maine Yankee Offsite Dose Calculation Manual (ODCM)

Subject:

Maine Yankee-Independent Spent Fuel Storage Installation Annual Radiological Environmental Operating Report and Annual Radioactive Effluent Release Report for 2009 Gentlemen:

In accordance with the requirements of references (b) and (c), enclosed are the 2009 Annual Radiological Environmental Operating Report and the Annual Radioactive Effluent Release Report for the Maine Yankee Independent Spent Fuel Storage Installation. Information formerly submitted in the Estimated Dose report is now included in the Environmental Operating report. No changes were made to the ODCM during 2009.

If you have any questions, please contact me at (207)-883-1303, or at JConnell@3yankees.com.

Sincerely, James Connell ISFSI Manager Attachments C: Mr. John Goshen, Project Manager, NRC Headquarters Mr. Samuel Collins, Regional Administrator, NRC Region I Ms. Judy Joustra, NRC Region I Mr. Mark Roberts, NRC Region I Mr. Jay Hyland State of Maine I Mr. Pat Dostie, Maine State Nuclear Safety Inspector o!rv15~

MAINE YANKEE INDEPENDENT SPENT FUEL STORAGE INSTALLATION License No. DPR-36 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT January - December 2009 0

RSCS Radiation Safety & Control Services March 2010 Prepared by:

Radiological Safety & Control Services 91 Portsmouth Avenue Stratham, NH 03885-2468

EXECUTIVE

SUMMARY

The Maine Yankee Independent Spent Fuel Storage Facility (ISFSI) has been in operation since 2001. 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 Maine Yankee ISFSI located in Wiscasset, ME was continued for the period January through December 2009 in compliance with the Maine Yankee Off-Site Dose Calculation Manual (ODCM).

No changes were made to the ODCM during 2009. 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 nine locations in the vicinity of the ISFSI and one control location 5.2 kilometers 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. The results of the monitoring performed in 2009 also show that operating the Maine Yankee ISFSI results in only a small fraction of the 40 CFR Part 190 direct radiation dose limit of 25 mrem/year to members of the public.

Page 2 of 29

TABLE OF CONTENTS Section Title Page 1.0 INTRO DUCTIO N ............................................................................. 6 2.0 GENERAL ISFSI AND SITE INFORMATION .................................. 7 3.0 PROG RAM DESIG N ...................................................................... .7 3.1 MONITORING ZONES ................................................................................. 7 3.2 PATHWAYS MONITORED ................... ................................................................ 8

3.3 DESCRIPTION

OF MONITORING PROGRAM ......................................................... 8 4.0 RADIOLOGICAL DATA

SUMMARY

TABLES ................................. 13 5.0 ANALYSIS OF ENVIRONMENTAL RESULTS ............................... 24 5.1 SAMPLING PROGRAM DEVIATIONS .................................................................. 24 5.2 DIRECT RADIATION PATHWAY .................................................................... 28

6.0 REFERENCES

.............................................................................. 29 Page 3 of 29

LIST OF TABLES Table Title Paqe 3.1 Radiological Environmental Monitoring Program ....................................... 9 3.2 Radiological Environmental Monitoring Locations....................................... 10 4.1 TLD Measurements by Quarter ..................................................................... 14 4.2 Exposure Rates from TLD Measurements ................................................... 15 4 .3 T LD D ata S um m ary ................................................................................ 16 4.4 Direct Dose from ISFSI Operations ............................................................ 17 Page 4 of 29

LIST OF FIGURES Figur Title Pace 3.1 Radiological Environmental Monitoring Locations (with in 0 .2 8 8 km ) ................................................................... .. 11 3.2 Direct Radiation Monitoring Locations (outside 1,km)....................................... 12 4.1 Exposure Rate Trend at TL-l-02.............................................. 18 4.2 Exposure Rate Trend at TL-I-04 ............................................... 19 4.3 Exposure Rate Trend at TL-I-06 ............................................... 20 4.4 Exposure Rate Trend at TL-I-08 .............................................. 21 4.5 Exposure Rate Trend at TL-I-10 ............................................... 22 4.6 Exposure Rate Trend at TL-1-12 .............................................. 23 4.7 Exposure Rate Trend at TL-1-14 ............................................... 24 4.8 Exposure Rate Trend at TL-1-15 ............................................. 25 4.9 Exposure Rate Trend at TL-1-16 ............................................... 26 4.10 Exposure Rate Trend at Control Location TL-O-36 ....................... 27 Page 5 of 29

1.0 INTRODUCTION

This report summarizes the findings of the Radiological Environmental Monitoring Program (REMP) conducted by Maine Yankee in the vicinity of the Independent Spent Fuel Storage Installation in Wiscasset, Maine during the calendar year 2009. It is submitted annually in compliance with Appendix A, of the Off-site Dose Calculation Manual (ODCM). The remainder of this report is organized as follows:

Section 2: Provides a brief description of the Maine Yankee site and its environs.

Section 3: Provides a description of the overall REMP design. Included is a summary of the requirements for REMP sampling, tables listing routine TLD monitoring locations with compass sectors and distances from the ISFSI, and maps showing the location of each of the TLD monitoring locations.

Section 4: 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).

Section 5: 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.

Section 6: References Page 6 of 29

2.0 GENERAL ISFSI AND SITE INFORMATION The Maine Yankee Independent Spent Fuel Storage Installation (ISFSI) is located in the town of Wiscasset, Lincoln County, Maine, approximately six miles northeast of Bath, Maine. The site vicinity is rural and lightly populated.

The ISFSI site is located near Bailey Point, a peninsula bounded to the east by the Back River and to the west by a shallow inlet known as Bailey Cove, both of which are part of the Montsweag Bay-Sheepscot River Estuary. Bailey point is an elongated bedrock ridge with flat or gently rolling topography rising to an average elevation of about 25 feet above sea level.

The Radiological Environmental Monitoring Program (REMP) for the ISFSI began pre-operational measurements in the 4th quarter of 1999, approximately 2 years 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 Maine Yankee 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 (Reference 3).

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 Figures 3.1 and 3.2 of this report.

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.

Page 7 of 29

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 Monitoring Program 3.3.1 Direct Radiation Direct gamma radiation exposure was continuously monitored during 2009 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 Insulation (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. For this monitoring period, three Outfall-01 8 water samples were collected as part of the Maine Yankee ISFSI Radiological Environmental Monitoring Program. The results of these samples are available for review at the site.

Page 8 of 29

Table 3.1 Radiological Environmental Monitoring Program Exposure Collection Analysis Pathway and/or Number of Routine Collection Analysis Analysis Sample Sample Sampling Frequency Type Frequency Media Locations Mode Direct Total Locations:10 Continuous Quarterly Gamma Each TLD Radiation (9 around dose (TLD) perimeter of the site and 1 offsite control location)

Page 9 of 29

Table 3.2 Radiological Environmental Monitoring Locations Station Distance Direction Station Description Zone* From ISFSI Code From ISFSI (km)

TL-O-36

  • Wiscasset Fire Station (0) 2 5.2 NW TL-1-02 Spent Fuel Storage (I)** 1 < 0.28 N TL-1-04 Spent Fuel Storage (l)** 1 < 0.28 NE TL-1-06 Spent Fuel Storage (l)** 1 < 0.28 E TL-1-08 Spent Fuel Storage (l)** 1 < 0.28 SE TL-1-10 Spent Fuel Storage (l)** 1 < 0.28 S TL-1-12 Spent Fuel Storage (I)** 1 < 0.28 SW TL-1-14 Spent Fuel Storage (l)** 1 < 0.28 W TL-1-15 Spent Fuel Storage (l)** 1 < 0.28 WNW TL-1-16 Spent Fuel Storage (I)** 1 < 0.28 NW
  • 2 = Control TLD; 1 = Indicator TLD
    • I = Inner Ring TLD; 0 = Outer Ring TLD Page 10 of 29

Figure 3.1 Radiological Environmental Monitoring Locations (within 0.288 km)

Page 11 of 29

Figure 3.2 Direct Radiation Monitoring Locations (outside I km) r I

i -

I I

2 r

/1 WI, 1~

/

/

ii ~

/1'

, " ;ilp A~

Edg~

4. -

/

,i J*

Page 12 of 29

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 13 of 29

. Table 4.1 TLD Measurements by Quarter (mR)

Station ID Direction 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr TL-I-02 N 29 26 25 26 TL-1-04 NE 26 25 28 27 TL-I-06 E 41 49 32 39 TL-I-08 SE 30 27 31 30 TL-I-10 S 27 29 NR 33 TL-1-12 SW 27 27 NR 30 TL-1-14 W 29 29 26 28 TL-1-15 WNW .30 33 31 32 TL-1-16 NW 28 29 28 35 TL-0-36 Control 23 26 25 26 TL-O-36a Control Backup 24 27 29 32 Note: NR = no result. The TLD at Station TL-1-10 and TL-1-12 in the 3rd quarter were damaged.

Page 14 of 29

Table 4.2 Exposure Rates from TLD Measurements (pR per hour)

Station ID Direction 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Ave TL-I-02 N S9.4 6.2 4.8 4.5 6.2 TL-1-04 NE 7.9 5.8 6.2 4.9 6.2 TL-1-06 E 15.7 16.0 8.1 10.5 12.6 TL-I-08 SE 9.9 6.7 7.6 6.3 7.6 TL-I-10 S 8.4 7.5 7.7 7.9 TL-1-12 SW 8.4 6.7 6.3 7.1 TL-1-14 W 9.4 7.5 5.3 5A4 6.9 TL-1-15 WNW 9.9 9.2 7.6 7.3 8.5 TL-1-16 NW 8.9 7.5 6.2 8.7 7.8 TL-O-36 Control 6.6 6.5 5.8 5.9 6.2 Page 15 of 29

Table 4.3 Environmental TLD Data Summary (pR per hour)

Inner Ring TLDs Control TLD's Station With Highest Mean Mean Mean Station # Mean (Range) (Range) (Range)

(No. Measurements)* (No. Measurements)* (No. Measurements)*

7.9 6.2 TL-1-06 12.6 (4.5 - 16.0) (5.8 - 6.6) (8.1-16.0)

(34) (8) (4)

  • Each "measurement" is based on quarterly readings Page 16 of 29

Table 4.4 Direct Dose from ISFSI Operations (mrem)

Q1 Q2 Q3 Q4 Net TLD Calculated Net TLD Calculated Net TLD Calculated Net TLD Calculated Annual Station ID Result Dose Result Dose Result Dose Result Dose Dose TL-1-02 5.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 TL-1-04 2.5 0.0 0.0 0.0 1.0 0.1 0.0 0.0 0.1 TL-1-06 17.5 -0.3 22.5 1.3 5.0 0.3 10.0 0.1 2.0 TL-I-08 6.5 0.1 0.5 0.0 4.0 0.2 1.0 0.0 0.4 TL-I-10 3.5 0.1 2.5 0.1 0.0 4.0 0.1 0.3 TL-1-12 3.5 0.1 0.5 0.0 0.0 1.0 0.0 0.1 TL-1-14 5.5 0.1 2.5 0.1 0.0 0.0 0.0 0.0 0.2 TL-1-15 6.5 0.1 6.5 0.4 4.0 0.2 3.0 0.0 0.8 TL-1-16 4.5 0.1 2.5 0.1 1.0 0.1 6.0 0.1 0.4 Max Dose => 2.0 Notes:

1. Doses based on a 32.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> occupancy in both of the first and fourth quarters and a 130 hour0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-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 17 of 29

Figure 4.1 Exposure Rate Trend at TL-I-02 Indicator Locations - TL-l*02 REMP TLD [Exposure Rate]

1,:13LI"',  :,3 ,31  :,'31".,1

- Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-02-001 03/31/2003 5.4E+000 pR/h t 1.18E+000 2.5E+000 TL-1-02-002 06/30/2003 . 8.OE+000 pRIh t 1.10E+000 2.5E+000 TL-I-02-003 09/30/2003 6.9E+000 pR/h t* 1.00E+000 2.5E+000 TL-1-02-004 12/31/2003 8.5E+000 pR/h t 9.OOE-001 2.5E+000 TL-I-02-005 03/31/2004 6.4E+000 pR/h t 8.20E-001 25E+000 TL-I-02-006 06/30/2004 8.3E+000 pR/h t* 8.OOE-001 2.5E+000 TL-1-02-007 09/30/2004 6.2E+000 pR/h t 6.60E-001 2.5E+000 TL-1-02-008 12/31/2004 6.8E+000 pR/h t 7.40E-001 2.5E+000 TL-1-02-009 03/31/2005 8.6E+000 pR/h t 8.60E-001 2.5E+000 TL-1-02-010 06/30/2005 7.8E+000 pR/h t 7.80E-001 2.5E+000 TL-1-02-011 09/30/2005 1.1 E+001 pR/h t 1.08E+000 2.5E+000 TL-1-02-012 12/31/2005 8.OE+000 pR/h t

  • 8.00E-001 2.5E+000 TL-1-02-013 03/31/2006 8.4E+000 pR/h t 8.40E-001 2.5E+000 TL-1-02-014 06/30/2006 7.9E+000 pR/h t 7.80E-001 2.5E+000 TL-I-02-015 09/30/2006 8.8E+000 pR/h t 8.80E-001 2.5E+000 TL-1-02-016 12/31/2006 1.2E+001 pR/h t 1.16E+000 2.5E+000 TL-1-02-017 03/31/2007 7.4E+000 pR/h t 7.40E-001 2.5E+000 TL-1-02-018 06/30/2007 8.1E+000 pR/h t 8.00E-001 2.5E+000 TL-1-02-019 09/30/2007 7.OE+000 pR/h t 7.OOE-001 2.5E+000 TL-1-02-020 12/31/2007 7.6E+000 pR/h t 7.60E-001 2.5E+000 TL-1-02-021 03/31/2008 7.6E+000 pR/h t 8.OOE-001 2.5E+000 TL-1-02-022 06/30/2008 7.9E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-02-023 09/30/2008 7.1 E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-02-024 12/31/2008 7.6E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-02-025 03/31/2009 9.4E+000 pR/h t
  • 1.OOE+000 2.5E+000 TL-1-02-026 06/30/2009 6.2E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-02-027 09/30/2009 4.8E+000 pR/h t
  • 4.OOE-001 2.5E+000 TL-1-02-028 12/31/2009 4.5E+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 Page 18 of 29

Figure 4.2 Exposure Rate Trend at TL-I-04 TedYeport 21110,/,(-1(,0 Dsly:Samnples collected between 0 1203and 0 1 01 /2010 Findicator Locations - TL-1--04 REMP TLD [Exposure Rate]

1 00e+001 0},03e+D,)0

  • -:31 ~3¢51 .*311 Y3*3 3  :, ,

Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-04-001 03/31/2003 5.1 E+000 pR/h t 1.26E+000 2.5E+000 TL-I-04-002 06/30/2003 8.4E+000 pR/h t 1.02E+000 2.5E+000 TL-I-04-003 09/30/2003 6.5E+000 pR/h 1" 7.20E-001 2.5E+000 TL-1-04-004 12/31/2003 8;3E+000 pR/h t

  • 1.14E+000 2.5E+000 TL-I-04-005 03/31/2004 6.9E+000 pR/h t 7.80E-001 2.5E+000 TL-I-04-006 06/30/2004 7.8E+000 pR/h 1*t 1.08E+000 2.5E+000 TL-I-04-007 09/30/2004 6.3E+000 pR/h t 6.20E-001 2+5E+000 TL-I-04-008 12/31/2004 6.3E+000 pR/h t 4.20E-001 2.5E+000 TL-1-04-009 03/31/2005 8.6E+000 pR/h t 8.60E-001 2.5E+000 TL-1-04-010 06/30/2005 8.2E+000 pR/h t 8.20E-001 2.5E+000 TL-I-04-01 1 09/30/2005 9.1E+000 pR/h t
  • 9.OOE-001 2.5E+000 TL-I-04-012 12/31/2005 8.0E+000 pR/h t* 8.OOE-001 2.5E+000 TL-I-04-013 03/31/2006 6.9E+000 pR/h t" 6.80E-001 2.5E+000 TL-I-04-014 06/30/2006 7.5E+000 pR/h t' 7.40E-001 2.5E+000 TL-1-04-015 09/30/2006 8.4E+000 pR/h t 8.40E-001 2.5E+000 TL-I-04-016 12/31/2006 1.2E+001 pR/h t 1.16E+000 2.5E+000 TL-I-04-017 03/31/2007 *7.OE+000 pR/h 1* 7.00E-001 2.5E+000 TL-I-04-018 06/30/2007 6.7E+000 pR/h t 6.60E-001 2.5E+000 TL-1-04-019 09/30/2007 5.9E+000 pR/h f 6.00E-001 2.5E+000 TL-1-04-021 03/31/2008 7.6E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-04-022 06/30/2008 4.9E+000 pR/h t
  • 4.00E-001 2.5E+000 TL-1-04-023 09/30/2008 5.3E+000 pR/h t 6.OOE-001 2.5E+000 TL-1-04-024 12/31/2008 8.9E+000 pR/h t 8.00E-001 2.5E+000 TL-I-04-025 03/31/2009 7.9E+000 pR/h t 8.00E-001 2.5E+000 TL-I-04-026 06/30/2009 5.8E+000 pR/h t 6.00E-001 2.5E+000 TL-1-04-027 09/30/2009 6.2E+000 pR/h 1"* 6.OOE-001 2.5E+000 TL-1-04-028 12/31/2009 4.9E+000 pR/h 1*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 19 of 29

Figure 4.3 Exposure Rate Trend at TL-I-06 Trend Report 4 2010 2, 1021O Displays: Samples collectedbetween 03/311/2O-O3 and W /0112010 Indicator Locations -TL-l 06 REMP TILD [Exposure Rate] ¶ '

1 32e+C'.21 1 03e+O))1 2 ).Y'4,-00 I- Result .... Discrimination LevelI Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-06-001 03/31/2003 7.1E+000 pR/h t 1.36E+000 2.5E+000 TL-I-06-002 06/30/2003 9.6E+000 pR/h t 1.OOE+000 2.5E+000 TL-I-06-003 09/30/2003 9.1 E+000 pR/h t* 1.46E+000 2.5E+000 TL-I-06-004 12/31/2003 1.2E+001 pR/h '* 1.16E+000 2.5E+000 TL-1-06-005 03/31/2004 9.6E+000 pR/h t 9.40E-001 2.5E+000 TL-1-06-006 06/30/2004 1.1E+001 pR/h t* 1.72E+000 2.5E+000 TL-I-06-007 09/30/2004 9.7E+000 pR/h t 1.20E+000 2.5E+000 TL-I-06-008 12/31/2004 9.6E+000 pR/h 1"t 1.24E+000 2,5E+000 TL-I-06-009 03/31/2005 1.1E+001 pR/h t 1.12E+000 2.5E+000 TL-1-06-01 0 06/30/2005 1.4E+001 pR/h t* 1.38E+000 2.5E+000 TL-1-06-011 09/30/2005 1.2E+001 pR/h t 1.18E+000 2.5E+000 TL-1-06-012 12/31/2005 1.OE+001 pR/h t* 1.04E+000 2.5E+000' TL-I-06-013 03/31/2006 1.5E+001 pR/h t 1.48E+000 2.5E+000 TL-I-06-014 06/30/2006 1.1 E+001 pR/h t 1.12E+000 2.5E+000 TL-1-06-015 09/30/2006 1.4E+001 pR/h 't 1.40E+000 2.5E+000 TL-I-06-016 12/31/2006 1.2E+001 pR/h t" 1.16E+000 2.5E+000 TL-I-06-017 03/31/2007 1.1E+001 pR/h 1t 1.10E+000 2.5E+000 TL-I-06-018 06/30/2007 1.OE+001 pR/h t* 1.OOE+000 2.5E+000

.TL-I-06-019 09/30/2007 1.2E+001 pR/h t 1.18E+000 2.5E+000 TL-1-06-020 12/31/2007 1.2E+001 pR/h t

  • 1.22E+000 2.5E+000 TL-1-06-021 03/31/2008 1.6E+001 pR/h "
  • 1.60E+000 2.5E+000 TL-I-06-022 06/30/2008 1.2E+001 pR/h "
  • 1.20E+000 2.5E+000 TL-I-06-023 09/30/2008 9.OE+000 pR/h 1
  • 8.00E-001 2.5E+000 TL-I-06-024 12/31/2008 9.8E+000 pR/h t
  • 1.OOE+000 2.5E+000 TL-I-06-025 03/31/2009 1.6E+001 pR/h 1
  • 1.60E+000 2.5E+000 TL-I-06-026 06/30/2009 1.6E+001 pR/h :
  • 1.60E+000 2.5E+000 TL-I-06-027 09/30/2009 8.1E+000 pR/hi'
  • 8.OOE-001 2.5E+000 TL-1-06-028 12/31/2009 1.1E+001 pR/h t 1.OOE+000 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 29

Figure 4.4 Exposure Rate Trend at TL-I-08 Trend ~Re port 211 210/2010O C DspaysSmpls ollected betwveen 01231 200 and 01 0112010~

Indicator Locations - TL-1-08 REMP TLD[Eor e]

1I +11 3

- Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-08-001 03/31/2003 5.2E+000 pR/h t 1.18E+000 2,5E+000 TL-1-08-002 06/30/2003 8.4E+000 pR/h t 1,24E+000 2.5E+000 TL-1-08-003 09/30/2003 6.5E+000 pR/h t 9.20E-001 2.5E+000 TL-I-08-004 12/31/2003 9.4E+000 pR/h t 1.OOE+000 25E+000 TL-I-08-005 03/31/2004 8.2E+000 pR/h t

  • 1.14E+000 2.5E+000 TL-I-08-006 06/30/2004 8.2E+000 pR/h t 1.14E+000 2.5E+000 TL-1-08-007 09/30/2004 6.7E+000 pR/h t 5.80E-001 2.5E+000 TL-1-08-008 12/31/2004 6.8E+000 pR/h t 5.40E-001 2.5E+000 TL-1-08-009 03/31/2005 1.0E+001 pR/h t 1.02E+000 2.5E+000 TL-1-08-010 06/30/2005 9.1 E+000 pR/h t 9.20E-001 2.5E+000 TL-1-08-011 09/30/2005 1.1 E+001 pR/h t 1.08E+000 2.5E+000 TL-1-08-012 12/31/2005 8.0E+000 pR/h t 8.00E-001 2.5E+000 TL-1-08-013 03/31/2006 9.3E+000 pR/h t* 9.40E-001 2.5E+000 TL-1-08-014 06/30/2006 7.0E+000 pR/h t 7.00E-001 2.5E+000 TL-1-08-015 09/30/2006 1.1E+001 pR/h t 1.08E+000 2.5E+000 TL-I-08-016 12/31/2006 1.6E+001 pR/h t 1.56E+000 2.5E+000 TL-I-08-017 03/31/2007 7.4E+000 pR/h t 7.40E-001 2.5E+000 TL-1-08-018 06/30/2007 8.1 E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-I-08-019 09/30/2007 8.6E+000 pR/h t 8.60E-001 2.5E+000 TL-I-08-020 12/31/2007 8.5E+000 pR/h t 8.40E-001 2.5E+000 TL-I-08-021 03/31/2008 8.5E+000 pR/h t 8.00E-001 2.5E+000 TL-I-08-022 06/30/2008 7.9E+000 pR/h t 8.00E-001 2.5E+000 TL-I-08-023 09/30/2008 7.6E+000 pR/h t 8.00E-001 215E+000 TL-I-08-024 12/31/2008 9.4E+000 pR/h t 1.OOE+000 2.5E+000 TL-I-08-025 03/31/2009 9.9E+000 pR/h t 1.00E+000 2.5E+000 TL-I-08-026 06/30/2009 6.7E+000 pR/h 1 6.OOE-001 2.5E+000 TL-I-08-027 09/30/2009 7.6E+000 pR/h t 8.00E-001 2.5E+000 TL-I-08-028 12/31/2009 6.3E+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 29

Figure 4.5 Exposure Rate Trend at TL-I-10

~Trend~ Re~port:.,. 21110120110 Displays: Saoipie's, cllected e betwen 0/313@2003 lAndi Ol7 01j* *1,O, Indicator Locations -, TL-I-1 0 REMP TLD, [Exposure Rate]

/

2,)*e+,OJ1

  • *','313,'3 *'3 ,*3 .*31 Y3.'Yý1

-.'I

- Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-10-001 03/31/2003 5.2E+000 pR/h t 1.18E+000 2.5E+000 TL-1-10-002 06/30/2003 8.2E+000 pR/h 1 1.04E+000 2.5E+000 TL-1-10-003 09/30/2003 6.4E+000 pR/h t 1.10E+000 2.5E+000 TL-1-10-004 12/31/2003 8.9E+000 pR/h t 8.60E-001 2.5E+000 TL-1-10-005 03/31/2004 6.9E+000 pR/h 1 8.60E-001 2.5E+000 TL-1-10-006 06/30/2004 7.7E+000 pRih t 1.06E+000 2.5E+000 TL-1-10-007 09/30/2004 6.5E+000 pR/h t 8.40E-001 2.5E+000 TL-1-10-008 12/31/2004 6.5E+000 pR/h t 9.60E-001 2.5E+000 TL-1-10-009 03/31/2005 8.1 E+000 pR/h t 8.20E-001 2.5E+000 TL-1-10-010 06/30/2005 8.2E+000 pR/h t 8.20E-001 2.5E+000 TL-1-10-011 09/30/2005 1.OE+001 pR/h-t 1.00E+000 2.5E+000 TL-I-10-012 12/31/2005 8.OE+000 pR/h 't

  • 8.OOE-001 2.5E+000 TL-1-10-013 03/31/2006 7.4E+000 pR/h t* 7.40E-001 2.5E+000 TL-1-10-014 06/30/2006 6.6E+000 pR/h t 6.60E-001 2.5E+000 TL-1-10-015 09/30/2006 8.4E+000 pR/h t 8.40E-001 2.5E+000 TL-1-10-016 12/31/2006 1.2E+001 pR/h t 1.16E+000 2.5E+000 TL-1-10-017 03/31/2007 7.OE+000 pR/h t 7.OOE-001 2.5E+000 TL-1-10-018 06/30/2007 9.OE+000 pR/h t 9.OOE-001 2.5E+000 TL-1-10-019 09/30/2007 9.2E+000 pR/h t 9.20E-001 2.5E+000 TL-1-10-020 12/31/2007 7.6E+000 pR/h t 7.60E-001 2.5E+000 TL-1-10-021 03/31/2008 9.OE+000 pR/h t 8.OOE-001 2.5E+000 TL-1-10-022 06/30/2008 7.4E+000 pR/h t 8.OOE-001 2.5E+000 TL-1-10-023 09/30/2008 6.7E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-10-024 12/31/2008 8.OE+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-10-025 03/31/2009 8.4E+000 pR/h t . . 8.OOE-001 2.5E+000 TL-1-10-026 06/30/2009 7.5E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-10-028 12/31/2009 7.7E+000 pR/h t
  • 8.00E-001 2.5E+000 Results marked with are greater than 2 Sigma Error.

Results marked with f are greater than the Discrimination Level Page 22 of 29

Figure 4.6 Exposure Rate Trend at TL-1-12 Tr~end Report < . 2/ 10/2010

.Displays: S&amples collected between Vli'1 003 and 01/01/2010, Indicator Locations -TL-I-1 2 REMP TLD [Exposure Rate] . . ..

1 ,1 *31 +*31 Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-12-001 03/31/2003 6.7E+000 pR/h t 1.30E+000 2.5E+000 TL-1-12-002 06/30/2003 9.7E+000 pR/h t 1.38E+000 2.5E+000 TL-1-12-003 09/30/2003 8.3E+000 pR/h t 1.14E+000 2.5E+000 TL-1-12-004 12/31/2003 9.8E+000 pR/h t 7.80E-001 2.5E+000 TL-1-12-005 03/31/2004 7.7E+000 pR/h t 1.50E+000 2.5E+000 TL-1-1 2-006 06/30/2004 1.06+001 pR/h t 1.14E+000 - 2.512+000 TL-1-12-007 09/30/2004 7.6E+000 pR/h t 7.006-001 2.5E+000 TL-1-12-008 12/31/2004 7.16+000 pR/h t 7.40E-001 2.5E+000 TL-1-12-009 03/31/2005 7.6E+000 pR/h t 7.60E-001 2.5E+000 TL-1-12-010 06/30/2005 8.7E+000 pR/h t 8.60E-001 2.5E+000 TL-1-12-011 09/30/2005 9.3E+000 pR/h t 9.OOE-001 2.5E+000 TL-1-12-012 12/31/2005 8.8E+000 pR/h t 8.80E-001 2.5E+000 TL-1-12-013 03/31/2006 8.4E+000 pR/h t

  • 8.40E-001 25E+000 TL-1-12-014 06/30/2006 6.6E+000 pR/h t 6.60E-001 2.5E+000 TL-1-12-015 09/30/2006 8.8E+000 pR/h t 8.80E-001 2.5E+600 TL-1-12-016 12/31/2006 1.3E+001 pR/h t 1.26E+000 2.5E+000 TL-1-12-017 03/31/2007 7.46E+000 pR/h t 7.40E-001 2.5E+000 TL-1-12-018 06/30/2007 7.2E+000 pR/h t 7.20E-001 2.5E+000 TL-1-12-019 09/30/2007 7.1E+000 pR/h t 7.001-001 2.5E+000 TL-1-12-020 12/31/2007 7.6E+000 pR/h t 7.60E-001 2.5E+000 TL-1-12-021 03/31/2008 9.0E+000 pR/h t 8.00E-001 2.5E+000 TL-1-12-022 06/30/2008 8.46E+000 pR/h t 6.06E-001 2.5E+000 TL-1-12-023 09/30/2008 8.5E+000 pR/h t 8.00E-001 2.5E+000 TL-1-12-025 03/31/2009 8.4E+000 pR/h t 6.00E-001 2.5E+000 TL-1-12-026 06/30/2009 6.7E+000 pR/h t 6.00E-001 2.5E+000 TL-1-12-028 12/31/2009 6.36E+000 pR/h t 6.06E-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 29

Figure 4.7 Exposure Rate Trend at TL-1-14

~Display~s: Samples collected betwveer 03 31 1/i6 O3 and 01~/01 1201 Indicator Locations- TL-1-14 :,REMPTLD [Exposure Rate]

13 Y31O)

- Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-14-001 03/31/2003. 6.7E+000 pR/h t 1.26E+000 2.5E+000 TL-1-14-002 06/30/2003 9.2E+000 pR/h t 1.04E+000 2.5E+000 TL-1-14-003 09/30/2003 8.3E+000 pR/h t 9.20E-001 2.5E+000 TL-1-14-004 12/31/2003 9.7E+000 pR/h t 1.OOE+000 2.5E+000 TL-1-14-005 03/31/2004 7.4E+000 pR/h 1* 8.OOE-001 2.5E+000 TL-1-14-006 06/30/2004 9.8E+000 pR/h t

  • 1.28E+000 2.5E+000 TL-1-14-007 09/30/2004 7.8E+000 pR/h t 8.80E-001 2.5E+000 TL-1-14-008 12/31/2004 7.8E+000 pR/h t 9.20E-001 2.5E+000 TL-1-14-009 03/31/2005 1.1E+001 pR/h t 1.06E+000 2,5E+000 TL-1-14-010 06/30/2005 9.6E+000 pR/h t 9.60E-001 2.5E+000 TL-1-14-011 09/30/2005 1.OE+001 pR/h t 1,04E+000 2.5E+000 TL-1-14-012 12/31/2005 1.OE+001 pR/h 1" 1.OOE+000 2.5E+000 TL-1-14-013 03/31/2006 9.8E+000 pR/h 1t 9.80E-001 2.5E+000 TL-1-14-014 06/30/2006 9.6E+000 pR/h t
  • 9.60E-001 2.5E+000 TL-1-14-015 09/30/2006 1.OE+001 pR/h t
  • 1.02E+000 2.5E+000 TL-1-14-016 12/31/2006 1.4E+001 pR/h t
  • 1.36E+000 2.5E+000 TL-1-14-017 03/31/2007 8.2E+000 pR/h 1.
  • 8.20E-001 2.5E+000 TL-1-14-018 06/30/2007 8.1 E+000 pR/h 1. 8.OOE-001 2.5E+000 TL-1-14-019 09/30/2007 8.1 E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-14-020 12/31/2007 8.1 E+000 pR/h t 8.OOE-001 2.5E+000 TL-1-14-021 03/31/2008 1.1E+001 pR/h t 1.O0E+000 2.5E+000 TL-1-14-022 06/30/2008 7.4E+000 pR/h t1 8.OOE-001 2.5E+000 TL-1-14-023 09/30/2008 6.7E+000 pR/h 1t" 6.OOE-001 2.5E+000 TL-1-14-024 12/31/2008 8.OE+000 pR/h t1 8.OOE-001 2.5E+000 TL-1-14-025 03/31/2009 9.4E+000 pR/h t 1.OOE+000 2.5E+000 TL-1-14-026 06/30/2009 7.5E+000 pR/h t 8.OOE-001 2.5E+000 TL-1-14-027 09/30/2009 5.3E+000 pR/h t 6.OOE-001 2.5E+000 TL-1-14-028 12/31/2009 5.4E+000 pR/h t* 6.OOE-001 2.5E+000 Results marked with are greater than 2 Sigma Error.

Results marked with tare greater than the Discrimination Level Page 24 of 29

Figure 4.8 Exposure Rate Trend at TL-1-15 Indicator Locations - TL--1 5 :.REMP TLD [Exposu're Rate],

1+*e+233 2,33e+,)3

    1. 31 ,&'31 -"1

.1 3*31 ,1 1

- Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-15-001 03/31/2003 7.1 E+000 pIR/h 1t 1.62E+000 2.5E+000 TL-1-15-002 06/30/2003 1.OE+001 pR/h 1t 1.34E+000 2.5E+000 TL-1-15-003 09/30/2003 8.5E+000 pR/h t 8,00E-001 2.5E+000 TL-1-15-004 12/31/2003 1.OE+001 pR/h t

  • 1.08E+000 2.5E+000 TL-1-15-005 03/31/2004 8.3E+000 pR/h 1t 8.OOE-001 2.5E+000 TL-1-15-006 06/30/2004 1.OE+001 pR/h t 1,06E+000 2.5E+000 TL-1-15-007 09/30/2004 8.0E+000 pR/h t 8,40E-001 2.5E+000 TL-1-15-008 12/31/2004 8.6E+000 pR/h t 6.OOE-001 2.5E+000 TL-1-15-009 03/31/2005 9.1 E+000 pR/h t 9.20E-001 2.5E+000 TL-1-15-010 06/30/2005 1.1 E+001 pR/h t 1.06E+000 2.5E+000 TL-1-15-011 09/30/2005 12E+001 pR/hit
  • 1.18E+000 2.5E+000 TL-1-15-012 12/31/2005 9.6E+000 pR/h t 9.60E-001 2.5E+000 TL-1-15-013 03/31/2006 1.0E+001 pR/h t" 1.04E+000 2.5E+000 TL-1-15-014 06/30/2006 9.6E+000 pR/h 1* 9.60E-001 2.5E+000 TL-1-15-015 09/30/2006 1.1E+001 pR/h ' 1.06E+000 2.5E+000 TL-1-15-016 12/31/2006 1.2E+001 pR/h t 1.16E+000, 2.5E+000 TL-1-15-017 03/31/2007 9.0E+000 pR/h t 9.OOE-001 2.5E+000 TL-1-15-018 06/30/2007 8.6E+000 pR/h t
  • 8.60E-001 2.5E+000 TL-1-15-019 09/30/2007 7.0E+000 pR/h t 7.00E-001 2.5E+000 TL-1-15-020 12/31/2007 8.1E+000 pR/h t 8.OOE-001 2.5E+000 TL-1-15-021 03/31/2008 1.2E+001 pR/hi-
  • 1.20E+000 2.5E+000 TL-1-15-022 06/30/2008 7.9E+000 pR/h t-
  • 8.00E-001 2.5E+000 TL-1-15-023 09/30/2008 7.1E+000 pR/h t' 8.OOE-001 2.5E+000 TL-1-15-024 12/31/2008 7.2E+000 pR/h t' 8.OOE-001 2.5E+000 TL-1-15-025 03/31/2009 9.9E+000 pR/h t- 1.OOE+000 2.5E+000 TL-1-15-026 06/30/2009 9.2E+000 pR/h t-' 1.OOE+000 2.5E+000 TL-1-15-027 09/30/2009 7.6E+000 pR/h t* 8.OOE-001 2.5E+000 TL-1-15-028 12/31/2009 7.3E+000 pR/h 1t 8.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 29

Figure 4.9 Exposure Rate Trend at TL-1-16

'Trend Repo~rt 7' 2/1012011,0 Displays: Samples coll~ected betweenO3/3v1 2and01 /0112010'.

Indicator Locations - TL-I- 6 REMP TLD [Exposure ,Rate]

-'Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-16-001 03/31/2003 6.7E+000 pR/h f 1.22E+000 2.5E+000 TL-1-16-002 06/30/2003 1.OE+001 pR/h t 1.48E+000 2.5E+000 TL-1-16-003 09/30/2003 9.OE+000 pR/h t 1.16E+000 2.5E+000 TL-1-16-004 12/31/2003 1.1 E+001 pR/h t 1.16E+000 2.5E+000 TL-1-16-005 03/31/2004 8.6E+000 pR/h t 9.80E-001 2.5E+000 TL-1-16-006 06/30/2004 1.OE+001 pR/h t 1.14E+000 2.5E+000 TL-1-16-007 09/30/2004 8.4E+000 pR/h t 1.16E+000 2.5E+000 TL-1-16-008 12/31/2004 8.8E+000 pR/h t 8.80E-001 2.5E+000 TL-1-16-009 03131/2005 8.1E+000 pR/h t 8.20E-001 2.5E+000 TL-1-16-010 06/30/2005 1.1E+001 pR/h t 1.14E+000 2.5E+000 TL-1-16-011 09/30/2005 1,OE+001 pR/h t 1.04E+000 2.5E+000 TL-1-16-012 12/31/2005 1.OE+001 pR/h t 1.04E+000 2.5E+000 TL-1-16-013 03/31/2006 9.8E+000 pR/h t 9.80E-001 2.5E+000 TL-1-16-014 06/30/2006 9.6E+000 pR/h t* 9.60E-001 2+5E+000 TL-1-16-015 09/30/2006 1.1E+001 pR/h t 1.06E+000 2.5E+000 TL-I-16-016 12/31/2006 1.4E+001 pR/h t

  • 1.36E+000 2.5E+000 TL-1-16-017 03/31/2007 8.6E+000 pR/h t
  • 8.60E-001 2.5E+000 TL-1-16-018 06/30/2007 9.5E+000 pR/h t
  • 9.60E-001 2.5E+000 TL-1-16-019 09/30/2007 7.5E+000 pR/h t
  • 7.60E-001 2.5E+000 TL-1-16-020 12/31/2007 8.1 E+000 pR/h 1
  • 8.OOE-001 2.5E+000 TL-1-16-021 03/31/2008 9.9E+000 pR/h t
  • 1.OOE+000 2.5E+000 TL-1-16-022 06/30/2008 8.9E+000 pR/h t* 8.OOE-001 2.5E+000 TL-1-16-023 09/30/2008 7.1 E+000 pR/h 1* 8.OOE-001 2.5E+000 TL-I-16-024 12/31/2008 8.5E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-16-025 03/31/2009 8.9E+000 pR/h,"
  • 8.OOE-001 2+5E+000 TL-1-16-026 06/30/2009 7.5E+000 pR/h t
  • 8.00E-001 2+5E+000 TL-1-16-027 09/30/2009 6.2E+000 pR/h t
  • 6.OOE-001 2+5E+000 TL-I-16-028 12/31/2009 8.7E+000 pR/h t
  • 8.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 26 of 29

Figure 4.10 Exposure Rate Trend at Control Location TL-O-36 TrendReport~ .211012010 Dipas Smlý cletdb~etwee 33/0' and 01 /011/2010 Control Location- TL-.-36... REMP TLD [Exposure Rate]

1 *3e+,31 203e+,)00

- Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-O-36-001 03/31/2003 7.9E+000 pR/h t 1.68E+000 2.5E+000 TL-O-36-002 06/30/2003 7.5E+000 pR/h t 1.04E+000 2.5E+000 TL-O-36-003 09/30/2003 7,8E+000 pR/h t 1.34E+000 2.5E+000 TL-O-36-004 12/31/2003 6.8E+000 pR/h t* 6.80E-001 2.5E+000 TL-O-36-005 03/31/2004 8.6E+000 pR/h 1t 6.80E-001 2.5E+000 TL-O-36-006 06/30/2004 6.3E+000 pR/h t 6.80E-001 2.5E+000 TL-0-36-007 09/30/2004 6.1E+000 pR/h t* 5.60E-001 2.5E+000 TL-O-36-008 12/31/2004 6.1E+000 pR/h t 4.80E-001 2.5E+000 TL-0-36-009 03/31/2005 8.1E+000 pR/h t 8.00E-001 2.5E+000 TL-O-36-010 06/30/2005 8.7E+000 pR/h t 8.60E-001 2.5E+000 TL-O-36-011 09/30/2005 1.0E+001 pRJh t 1.00E+000 2.5E+000 TL-O-36-012 12/31/2005 8.0E+000 pR/h t 8.00E-001 2.5E+000 TL-O-36-013 03/31/2006 6.6E+000 pR/h t"* 6.60E-001 2.5E+000 TL-O-36-014 06/30/2006 7.7E+000 pR-h t

  • 7.60E-001 2.5E+000 TL-O-36-015 09/30/2006 7.2E+000 pR/h t
  • 7.20E-001 2.5E+000 TL-O-36-016 12/31/2006 1.1E+001 pR/h t
  • 1.12E+000 2.5E+000 TL-O-36-017 03/31/2007 6.8E+000 pR/h t 6.80E-001 2.5E+000 TL-O-36-018 06/30/2007 7,2E+000 pR/h t* 7.20E-001 2.5E+000 TL-O-36-019 09/30/2007 7.3E+000 pR/h t 7.20E-001 2.5E+000 TL-O-36-020 12/31/2007 6.8E+000 pR/h t* 6.80E-001 2.5E+000 TL-O-36-021 03/31/2008 7.6E+000 pR/h t 8.00E-001 2.5E+000 TL-O-36-022 06/30/2008 5.9E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-0-36-023 09/30/2008 5.1E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-0-36-024 12/31/2008 6.3E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-0-36-025 03/31/2009 6.6E+000 pR/h t* 6.00E-001 2.5E+000 TL-O-36-026 06/30/2009 6.5E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-0-36-027 09/30/2009 5.8E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-O-36-028 12/31/2009 5.9E+000 pR/h 1* 6.00E-001 2.5E+000 Results marked with are greater than. 2 Sigma Error.

Results marked with t are greater than the Discrimination Level Page 27 of 29

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.

One deviation occurred 2009. There is no data at locations TL-I-10 and TL-1-12 for the 3rd quarter. Although the TLDs were deployed for the quarter, the TLDs were physically damaged during transit and prevented readout. The locations of the TLDs have an insignificant impact in terms of calculation offsite dose to any real member of the public.

5.2 Direct Radiation Pathway 5.2.1 Exposure Rates Direct radiation is continuously measured at 9 indicator locations surrounding the Maine Yankee ISFSI, along with 1 control location (Wiscasset Fire Station) 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 that all indicator locations were slightly elevated in comparison to the control location exposure rates. Figures 4.1 through 4.10 provide exposure rate trends of the monitoring locations since 2003. Review of Figures 4.1 through 4.10 shows no significant difference in exposure rates over time 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 A 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. Direct exposure above background can be estimated by subtracting the average TLD value of the control station from the indicator location measurements. As in previous years, the 2009 dose estimate assumes a total of 325 hours0.00376 days <br />0.0903 hours <br />5.373677e-4 weeks <br />1.236625e-4 months <br /> occupancy for the dose calculation; of which 32.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> are used in both the first and fourth quarters and 130 hours0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-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 Back River, Bailey Cove or Montsweag Bay for Page 28 of 29

boating and fishing and the mud .flats in the Cove or Bay exposed at low tides which is worked by clam diggers and worm diggers; 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 at Station ID number TL-I-06. The maximum calculated annual dose at that location is 2.0 mrem. This value is only 8 percent of the 25 mrem per year limit. It is noted that most of the mud flat region in Bailey Cove that is used by the public is situated further away from this Station. As a result, actual exposures from direct radiation would be much less than the maximum calculated value.

6.0 REFERENCES

1. USNRC Radiological Assessment Branch Technical Position, "An Acceptable Radiological Environmental Monitoring Program," Revision 1, November 1979.
2. Maine Yankee Off-site Dose Calculation Manual, Revision 33.
3. 40 CFR Part 190, "Environmental Radiation Protection Standards for Nuclear Power Operation".

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