ML12088A064

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Independent Spent Fuel Storage Installation Annual Radiological Environmental Operating Report, January - December 2011
ML12088A064
Person / Time
Site: Maine Yankee, 07100465
Issue date: 03/06/2012
From:
Radiological Safety & Control Services
To:
Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
Download: ML12088A064 (39)
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MAINE YANKEE INDEPENDENT SPENT FUEL STORAGE INSTALLATION License No. DPR-36 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT January - December 2011 ARSCS Radiation Safety & Control Services March 2012 Prepared by:

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

EXECUTIVE

SUMMARY

The Maine Yankee Independent Spent Fuel Storage Installation (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 2011 in compliance with the Maine Yankee Off-Site Dose Calculation Manual (ODCM).

Changes were made to the ODCM during 2011. Table 3.1, Radiological Environmental Monitoring Locations, was changed by adding the frequency of monitoring. In addition, the information in the Estimated Dose Report was incorporated into the Annual Operating Report. 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 2011 also show that operating the Maine Yankee 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.

TABLE OF CONTENTS Section Title Paae

1.0 INTRODUCTION

............................................................................ 6 2.0 GENERAL ISFSl AND SITE INFORMATION ................. 7 3.0 PROGRAM DESIGN ...................................................................... 7 3.1 M ONITORING ZONES .................................................................................. 7 3.2 PATHWAYS M ONITORED ............................................................................ 8

3.3 DESCRIPTION

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

SUMMARY

TABLES ............................. 13 5.0 ANALYSIS OF ENVIRONMENTAL RESULTS ............................. 38 5.1 SAMPLING PROGRAM DEVIATIONS ............................................................. 38 5.2 DIRECT RADIATION PATHWAY ................................................................... 38

6.0 REFERENCES

............................................................................. 39

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 Environmental TLD Data Cummary ............................................ 16 4.4 Direct Dose from ISFSI Operations ........................................... 17

LIST OF FIGURES Figure Title Page 3.1 Radiological Environmental Monitoring Locations (within 0.28 km) .......................................................................... 11 3.2 Direct Radiation Monitoring Locations (outside 1 km) ............................................................................ 12 4.1 Exposure Rate Trend at TL-I-02 ................................................ 18 4.2 Exposure Rate Trend at TL-I-04 ................................................ 20 4.3 Exposure Rate Trend at TL-1-06 ................................................ 22 4.4 Exposure Rate Trend at TL-1-08 ................................................ 24 4.5 Exposure Rate Trend at TL-1-10 ................................................ 26 4.6 Exposure Rate Trend at TL-l-12 ................................................ 28 4.7 Exposure Rate Trend at TL-1-14 ................................................ 30 4.8 Exposure Rate Trend at TL-1-15 ................................................ 32 4.9 Exposure Rate Trend at TL-1-16 ................................................ 34 4.10 Exposure Rate Trend at Control LocationTL-O-36 .................. 36

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 2011. 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

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 (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 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.

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 2011 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 can be 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, no samples were collected as part of the Maine Yankee ISFSI Radiological Environmental Monitoring Program.

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)

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 (I)** 1 < 0.28 NE TL-1-06 Spent Fuel Storage (l)** 1 < 0.28 E TL-1-08 Spent Fuel Storage (I)** 1 < 0.28 SE TL-1-10 Spent Fuel Storage (I)** 1 < 0.28 S TL-1-12 Spent Fuel Storage (I)** 1 < 0.28 SW TL-1-14 Spent Fuel Storage (I)** 1 < 0.28 W TL-1-15 Spent Fuel Storage (I)** 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

Figure 3.1 Radiological Environmental Monitoring Locations (within 0.28 km)

I J

I I

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i I

Figure 3.2 Direct Radiation Monitoring Locations (outside I kin)

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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.

Table 4.1 TLD Measurements by Quarter (mR)

Station ID Direction 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr TL-I-02 N 21 30 27 30 TL-I-04 NE 25 31 28 32 TL-I-06 E 36 32 50 41 TL-I-08 SE 30 35 29 34 TL-I-1 0 S 27 34 32 32 TL-1-1 2 SW 28 34 27 32 TL-1-14 W 28 33 35 27 TL-1-15 WNW 23 35 32 33 TL-1-16 NW 26 34 34 34 TL-0-36 Control 25 29 26 29 TL-O-36a Control Backup 25 32 28 36

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 4.7 6.0 7.7 6.0 6.1 TL-I-04 NE 6.7 6.5 8.1 6.9 7.0 TL-I-06 E 12.1 6.9 17.5 11.1 11.9 TL-I-08 SE 9.2 8.3 8.6 7.8 8.5 TL-I-1 0 S 7.7 7.8 9.8 6.9 8.1 TL-1-12 SW 8.2 7.8 7.7 6.9 7.7 TL-1-14 W 8.2 7.4 11.1 4.6 7.8 TL-1-15 WNW 5.7 8.3 9.8 7.4 7.8 TL-1-16 NW 7.2 7.8 10.7 7.8 8.4 TL-O-36 Control 6.7 6.2 7.7 7.1 6.9

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)*

8.1 6.9 TL-1-06 11.9 (4.6-17.5) (6.2-7.7) (6.9-17.5)

(36) (8) (4)

  • Each "measurement" is based on quarterly readings

Table 4.4 Direct Dose from ISFSI Operations (mrem)

QI 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 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TL-1-04 0.0 0.0 0.5 0.0 1.0 0.1 0.0 0.0 0.1 TL-1-06 11.0 0.2 1.5 0.1 23.0 1.4 8.5 0.1 1.7 TL-1-08 5.0 0.1 4.5 0.3 2.0 0.1 1.5 0.0 0.5 TL-I-1 0 2.0 0.0 3.5 0.2 5.0 0.3 0.0 0.0 0.5 TL-1-12 3.0 0.0 3.5 0.2 0.0 0.0 0.0 0.0 0.3 TL-1-14 3.0 0.0 2.5 0.1 8.0 0.5 0.0 0.0 0.7 TL-1-1 5 0.0 0.0 4.5 0.3 5.0 0.3 0.5 0.0 0.6 TL-1-16 1.0 0.0 3.5 0.2 7.0 0.4 1.5 0.0 0.7 Max Dose => 1.7 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

Figure 4.1 Indicator Locations - TL-1-02 REMP TLD [Exposure Rate]

120e+O01 103+01 403e+O0 203Oe+OW 000e+O0 S Result - Discrimination Levelo 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 MR/h t
  • 1.10E+000 2.5E+000 TL-1-02-003 09/30/2003 6.9E+000 pR/h t
  • 1.OOE+000 2.5E+000 TL-1-02-004 12/31/2003 8.5E+000 MR/h t
  • 9.OOE-001 2.5E+000 TL-1-02-005 03/31/2004 6.4E+000 pR/h t
  • 8.20E-001 2.5E+000 TL-1-02-006 06/30/2004 8.3E+O0O pR/h t
  • 8.OOE-001 2.5E+000 TL-1-02-007 09/30/2004 6.2E+OOO 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-1-02-01 0 06/30/2005 7.8E+000 pR/h t
  • 7.80E-001 2.5E+000 TL-1-02-01 1 09/30/2005 1.1E+001 pRJh t
  • 1.08E+000 2.5E+000 TL-1-02-012 12/31/2005 8.0E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-02-01 3 03/31/2006 8.4E+000 pR/h t
  • 8.40E-001 2.5E+000 TL-1-02-014 06130/2006 7.9E+000 pR/h t
  • 7.80E-001 2.5E+000 TL-1-02-01 5 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 MR/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-1-02-01 8 0613012007 8.1 E+000 pR/h t
  • 8.0OE-001 2.5E+000 TL-1-02-01 9 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 7.1E+000 MR/h t
  • 8.OOE-001 2.5E+000 TL-1-02-024 12/31/2008 7.6E+000 MR/h t
  • 8.OOE-001 2.5E+000 TL-1-02-025 03/31/2009 9.4E+000 pR/h t
  • 1.OOE+000 25E+000 TL-1-02-028 06/30/2009 6.2E+000 jR/h t
  • B.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 MR/h t
  • 4.OOE-001 2.5E+000 TL-1-02-029 03/31/2010 7.4E+000 MR/h t
  • 8.OOE-001 2.5E+000 TL-1-02-030 06/30/2010 6.8E+000 jR/h t
  • 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

Indicator Locations - TL-1-02 :REMP TLD [Exposure Rate] ContinuJed...

1 00e+031

,PI 4 Mt+ODD 2 We+OM Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-02-031 09/30/2010 5.7E+000 pR/h t

  • 6.OOE-001 2.5E+000 TL-I-02-032 12/31/2010 5.5E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-1-02-033 03/31/2011 4.7E+000 pRih t
  • 4.00E-001 2.5E+000 TL-I-02-034 06/30/2011 6.0E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-I-02-035 09/30/2011 7.7E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-I-02-036 12/31/2011 6.0E+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

Figure 4.2 Indicator Locations - TL-1-04 REN¶P TL.D [Exposure Rate]

140e+O31 120e+Oi I Ooe01 4ODE+OM 0 ODE+=~

Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-04-001 03/31/2003 5.1E+000 piR/h t

  • 1.26E+000 2.5E+000 TL-1-04-002 06/30/2003 8.4E+000 pjR/h t
  • 1.02E+000 2.5E+000 TL-1-04-003 09/30/2003 6,5E+000 pR/h t
  • 7.20E-001 2.5E+000 TL-I-04-004 12/31/2003 8.3E+000 pR/h t
  • 1.14E+000 2.5E+000 TL-1-04-005 03131/2004 6.9E+000 pR/h t
  • 7.80E-001 2.5E+000 TL-1-04-006 06/30/2004 7.8E+000 pR/h t
  • 1.08E+000 2.5E+000 TL-1-04-007 09/30/2004 6.3E+000 pR/h t
  • 6.20E-001 2.5E+000 TL-1-04-008 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-1-04-01 1 09/30/2005 9.1E+000 pR/h t
  • 9.OOE-001 2.5E+000 TL-1-04-012 12/31/2005 8.OE+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-04-013 03/31/2006 6.9E+000 pR/h t
  • 6.80E-001 2.5E+000 TL-1-04-014 06/30/2006 7.5E+000 pR/h t
  • 7.40E-001 2,512+000 TL-1-04-01 5 09/30/2006 8.4E+000 pR/h t
  • 8.40E-001 2.5E+000 TL-1-04-016 12/31/2006 1.2E+001 PR/h t
  • 1.16E+000 2.5E+000 TL-1-04-01 7 03/31/2007 7.OE+000 pR/h t
  • 7.OOE-001 2.5E+000 TL-1-04-01 8 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 t
  • 6.OOE-001 2.5E+000 TL-1-04-021 03/31/2008 7.6E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-04-022 06/30/2008 4.9E+000 pR/h t
  • 4.OOE-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.OOE-001 2.5E+000 TL-1-04-025 03/31/2009 7.9E+000 pjR/h t
  • 8.OOE-001 2.5E+000 TL-1-04-026 06/30/2009 5.8E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-04-027 09/30/2009 6.2E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-04-028 12/31/2009 4.9E+000 pR/h t
  • 4.OOE-001 2.5E+000 TL-1-04-029 03/31/2010 8.3E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-04-030 06/30/2010 7.8E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-04-031 09/30/2010 1.3E+001 pR/h t
  • 1.20E+000 2.5E+ODO Results marked with
  • are greater than 2 Sigma Error.

Results marked with t are greater than the Discrimination Level

Indicator Locations - TL-I-04 REMP TLD [Exposure Rate] Continued...

400e+001 a ODR+O3 100"+001 S00e+OM 0 00"=O~

zw"=~~ ~- ."rmn°

..------------ " I Result - DiscrImnaonL el Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-04-032 12/31/2010 5.5E+000 pR/h t

  • 6.00E-001 2.5E+000 TL-1-04-033 03/31/2011 6.7E+000 pPJh t
  • 6.00E-001 2.5E+000 TL-1-04-034 06/30/2011 6.5E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-I-04-035 09/30/2011 8.1 E+000 pR/h t 8.00E-001 2.5E+000 TL-1-04-036 12/31/2011 6.9E+000 pR/h t
  • 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

Figure 4.3 Exposure Rate Trend at TL-1-06 Indicator Locations - TL-1-06 REMP TILD [Exposure Rate] I 1 ae*0~1 I 60e+001 1 40O5D1 1 21+001 03e+W I 11m4 a 00e+030 6 O0e+OM

- Result - Discrimination Level 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 08/30/2003 9.6E+000 pR/h t
  • 1.00E+000 2.5E+000 TL-1-06-003 09/30/2003 9.1 E+000 ijR/h t
  • 1.46E+000 2.5E+000 TL-1-06-004 12/31/2003 1.2E+001 pjR/h t
  • 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 1.1 E+001 hR/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-1-06-008 12/31/2004 9.6E+000 MR/h t
  • 1.24E+000 2.5E+000 TL-I-06-009 03/31/2005 1.IE+001 pR/h t
  • 1.12E+000 2.5E+000 TL-1-06-010 06/30/2005 1.4E+001 pR/h t
  • 1.38E+000 2.5E+000 TL-I-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-1-06-013 03/31/2006 1.6E+001 pR/h t
  • 1.48E+000 2.5E+000 TL-1-06-014 06/30/2006 1.1 E+001 pR/h t
  • 1.12E+000 2.5E+000 TL-I-06-015 09/30/2006 1.4E+001 pR/h t
  • 140E+000 2.5E+000 TL-1-06-016 12/31/2006 1.2E+001 pR/h t
  • 1.16E+000 2.5E+000 TL-I-06-017 03/31/2007 1.1 E+001 pR/h t
  • 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-I-06-020 12/31/2007 1.2E+001 pR/h t
  • 1.22E+000 2.5E+000 TL-I-06-021 03/31/2008 1.6E+001 pR/h t
  • 1.60E+000 2.5E+000 TL-I-06-022 06/30/2008 1.2E+001 pRJh t
  • 1.20E+000 2.5E+000 TL-1-06-023 09/30/2008 9.OE+000 pR/h t
  • 8.OOE-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 t
  • 1.60E+000 2.5E+000 TL-I-06-026 06/30/2009 1.6E+001 pR/h t
  • 1.60E+000 2.5E+000 TL-1-06-027 09/30/2009 8.1E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-I-06-028 12/31/2009 1.1E+001 pR/h t
  • 1.OOE+000 25E+000 TL-1-06-029 03/31/2010 1.4E+001 pR/h t
  • 1,40E+000 2.5E+000 TL-1-06-030 06/30/2010 1.2E+001 pR/h t
  • 1.20E+000 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.

Results marked with t are greater than the Discrimination Level

Indicator Locations - TL-1-06 REMP TLD [Exposure Rate] Continued...

I AOe+OO1 1 Z)6+001 4O0t+OM 2 Dole+00 0 00t+0D Result - DiscrimnaonL el Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-06-031 09/30/2010 8.6E+000 pjR/h f *8.OOE-001 2.5E+000 TL-1-06-032 12/31/2010 8.2E+000 PjR/h t *8.00E-001 2.5E+000 TL-1-06-033 03/31/2011 1.2E+001 pR/h t* 1.20E+000 2.5E+000 TL-1-06-034 06/30/2011 6.9E+000 pR/h t *6.O0E-001 2.5E+000 TL-1-06-035 09/30/2011 1.8E+001 pjR/h t

  • 1.80E+000 2.5E+000 TL-1-06-036 12/31/2011 1.1 E+001 pjR/h t
  • 1.20E+000 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.

Results marked with t are greater than the Discrimination Level

Figure 4.4 Exposure Rate Trend at TL-1-08 Indicator Locations -TL-108 REMP TLD [Exposure Rate]

16oe+=o 140*+001 1 20"WlO I 00e+001 a 03P+=X~

6 03*+000 Sooe+o0o

- Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-08-001 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-1-08-004 12/31/2003 9.4E+000 pR/h t
  • 1.00E+000 2.5E+000 TL-1-08-005 03/31/2004 8.2E+000 pJR/h t
  • 1.14E+000 2.5E+000 TL-1-08-006 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.OE+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-1-08-01 1 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
  • 8OOE-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.OE+000 pR/h t
  • 7OOE-001 2.5E+000 TL-1-08-015 09/30/2006 1.1E+001 pR/h t
  • 1.08E+000 2.5E+000 TL-1-08-016 12/31/2006 1.6E+001 pJR/h t
  • 1.56E+000 2.5E+000 TL-1-08-017 03/31/2007 7.4E+000 pJR/h t
  • 7.40E-001 2.5E+000 TL-1-08-018 06/30/2007 8.IE+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-08-019 09/30/2007 8.6E+000 pJR/h t
  • 8.60E-001 2.5E+000 TL-1-08-020 12/31/2007 8.SE+000 pR/h t
  • 8.40E-001 2.5E+000 TL-1-08-021 03/31/2008 8.5E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-08-022 06/30/2008 7.9E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-08-023 09/30/2008 7.6E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-08-024 12/31/2008 9.4E+000 iJR/h t
  • 1.00E+000 2.5E+000 TL-1-08-025 03/31/2009 9,9E+000 pR/h t
  • 1.00E+000 25E+000 TL-1-08-026 06/30/2009 6.7E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-08-027 09/30/2009 7.6E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-08-028 12/31/2009 6.3E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-08-029 03/31/2010 8.3E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-08-030 06/30/2010 7.3E+000 pR/h t
  • 8.00E-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.

Results marked with t are greater than the Discrimination Level

Indicator Locations - TiL-08 REMP TLD [Exposure Rate] Continued.

120e+031 i Ooe+O0 00"

-- Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-i-08-031 09/30/2010 7.8E+000 pR/h t

  • 8.00E-001 2.5E+000 TL-1-08-032 12/31/2010 6.8E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-1-08-033 03/31/2011 9.2E+000 pR/h t
  • 1.00E+000 2.5E+000 TL-1-08-034 06/30/2011 8.3E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-08-035 09/30/2011 8.6E+000 pR/h t* 8.OOE-001 2.5E+000 TL-1-08-036 12/31/2011 7.8E+000 pR/h t
  • 8.00E-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error, Results marked with t are greater than the Discrimination Level

Figure 4.5 P~nta TraviO Indicator Locations - TL-1'-1 0f REMP TLID [Exposure Ra~te]

120e+0o1 I Oxe+OD1 00"e+MO Oo~e+OM2

- Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-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 t
  • 1.04E+000 2.SE+000 TL-1-10-003 09/30/2003 6.4E+000 pR/h t
  • 1.1 0E+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 t
  • 8.60E-001 2.5E+000 TL-I-10-006 06/30/2004 7.7E+000 pR/h t
  • 1.06E+000 2.5E+000 TL-I-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 8.1E+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-1-10-01 1 09/30/2005 1.OE+001 pR/h t
  • 1.00E+000 2.5E+000 TL-1-10-012 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 25E+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-00"1 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
  • 8.00E-001 2.5E+000 TL-1-10-022 06/30/2008 7.4E+000 MR/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.OOE-001 2,5E+000 TL-I-10-029 03/31/2010 9.6E+000 pR/h t
  • 10E+000 2.5E+000 TL-1-10-030 06/30/2010 7.3E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-10-031 09/30/2010 8.6E+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

Indicator Locations - TL-*I-1 0: REMP TLD [Exposure Rate] Copntiunud..

403"M~

2 O0e-o..

-- Result Discrimination Leve Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-10-032 12/31/2010 6.4E+000 PR/h t

  • 6.00E-001 2.5E+000 TL-I-10-033 03/31/2011 7.7E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-I-10-034 06/30/2011 7.8E+000 pR/h t
  • 8.00E-OC1 2.5E+000 TL-I-10-035 09/30/2011 9.8E+000 pR/h t
  • 1.00E+000 2.5E+000 TL-I-10-036 12/31/2011 6.9E+000 pR/h t
  • 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

Figure 4.6 Indicator Locations - TL--!12 REMP TLD [Exposure Rate]

I 40e+001 a Oe+000 5e+/0/

4~)I+OM Result _ Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discimination 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 jR/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-1-12-006 06/30/2004 1.OE+001 PR/h t
  • 1.14E+000 2.5E+000 TL-1-12-007 09/30/2004 7.6E+000 pR/h t
  • 7.OOE-001 2.5E+000 TL-1-12-008 12131/2004 7.IE+000 jR/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 9.1E+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 2.5E+000 TL-1-12-014 06/30/2006 6.6E+000 pR/h 1
  • 6.60E-001 2.5E+000 TL-1-12-015 09/30/2006 8.8E+000 pR/h t
  • 8.80E-001 2.5E+000 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 7.4E+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.OE+000 pR/h t
  • 7.OOE-001 2.5E+000 TL-1-12-020 12131/2007 7.6E+000 pR/h t
  • 7.60E-001 2.5E+000 TL-1-12-021 03/31/2008 9.OE+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-12-022 06/30/2008 8.4E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-12-023 09/30/2008 8.5E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-12-025 03/31/2009 8.4E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-12-026 06/30/2009 6.7E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-12-028 12/31/2009 6.3E+000 pR/h t
  • 6,OOE-001 2.5E+000 TL-1-12-029 03/31/2010 8.7E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-12-030 06/30/2010 5.9E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-1-12-031 09/30/2010 8.2E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-12-032 12/31/2010 7.3E+000 pR/h t * &OOE-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.

Results marked with t are greater than the Discrimination Level

I Indicator Locations - TL 12 : REMP TLD [Exposure Rate] Continued..

1 01+W 120t+01 1 ~Oe+IOM a OD 6 OO+0 i S*O 1ý J0 1!6

- Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-12-033 03/31/2011 8.2E+000 piR/h t

  • 8.00E-001 2.5E+000 TL-1-12-034 06/30/2011 7.8E+000 pR/h t
  • 8.O0E-001 2.5E+000 TL-1-12-035 09/30/2011 7.7E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-12-036 12/31/2011 6.9E+000 pR/h t
  • 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

Figure 4.7 Indicator Locations - TL-I- 14 REMP TLD [Exposure Rate]

1 toe+O01 6 00*+O ZD0e+ODD

- Result D mnation Level Discri-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
  • 1.00E+000 2.5E+000 TL-1-14-005 03/31/2004 7.4E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-14-006 06/30/2004 9.8E+000 pJR/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-1-14-01 1 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 t
  • 1.00E+000 2.5E+000 TL-1-14-01 3 03/31/2006 9.8E+000 pR/h t
  • 9.80E-001 2.5E+000 TL-1-14-014 06/30/2006 9.6E+000 jR/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 jR/h t
  • 1.36E+000 2.5E+000 TL-1-14-017 03/31/2007 8.2E+000 pR/h t* 820E-001 2.5+000 TL-1-14-01 8 06/30/2007 8.1EE+000 pR/h t* 8OOE-001 2.5E+000 TL-1-14-01 9 09/30/2007 8.1 E+000 JR/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 1.1 E+001 pR/h t
  • 1.00E+000 2.5E+000 TL-1-14-022 06/30/2008 7.4E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-14-023 09/30/2008 6.7E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-14-024 12/31/2008 8.OE+000 pR/h t
  • 8OOE-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
  • 6OOE-001 2.5E+000 TL-1-1 4-028 12/31/2009 5.4E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-1-14-029 03/31/2010 8.3E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-14-030 06/30/2010 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

Indicator L.ocations - TL 14 REMP TLP> [Exposu~re Rate] otne!.

14oe+o1 12C0+o02 I O~rOeOI 1 AI, i 6Owe+OM 6 OC*+O0 2

0.c0e+000 00e+O00

- Result DiscriminationLel Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-14-031 09/30/2010 6.5E+000 pR/h t

  • 6.OOE-001 2.5E+000 TL-1-14-032 12/31/2010 8.7E+000 PR/h t
  • 8.00E-001 2.5E+000 TL-1-14-033 03/31/2011 8.2E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-14-034 06/30/2011 7.4E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-14-035 09/30/2011 1.1E+001 PR/h t
  • 1.20E+000 2.5E+000 TL-1-14-036 12/31/2011 4.6E+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

Figure 4.8 Exposure Rate Trend at TL-1-15 Indicator Locations - TL-1-1 5 REMP TLD [Exposure Rate] I 120e+o01 1 Got+O31 6i OD"M-00e+000 I Result - Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-15-001 03/31/2003 7.1E+000 pR/h t

  • 1.62E+000 2.5E+000 TL-1-15-002 06/30/2003 1.OE+001 pR/h t
  • 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 1.0E+001 pR/h t
  • 1.08E+000 2.5E+000 TL-1-15-005 03/31/2004 8.3E+000 pR/h t
  • 8.OOE-001 2.5E1+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.OE+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 9.1E+000 pR/h t1* 9.20E-001 2.5E+000 TL-1-15-010 06/30/2005 1.IE+001 pR/h t
  • 1.06E+000 2.5E+000 TL-1-15-011 09/30/2005 1.2E+001 pR/h t* 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.OE+001 pR/h t
  • 1.04E+000 2.5E+000 TL-1-15-014 06/30/2006 9.6E+000 pR/h t
  • 9.60E-001 2.5E+000 TL-I-15-015 09/30/2006 1.1E+001 pR/h t
  • 1.06E+000 2.5E+000 TL-1-15-016 12/31/2006 1.2E+001 pRJh t
  • 1.16E+000 2.5E+000 TL-1-15-017 03/31/2007 9.OE+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.OE+000 jR/h t 7.OOE-001 2.5E+000 TL-1-15-020 12/31/2007 8.1 E+000 jR/h t
  • 800E-001 2.5E+000 TL-1-15-021 03/31/2008 1.2E+001 pR/h t"* 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 jR/h t
  • 1.OOE+000 2.15E+000 TL-1-15-026 06/30/2009 9.2E+000 jR/h t
  • 1.OOE+000 2. 5E+000 TL-1-15-027 09/30/2009 7.6E+000 jR/h t 8.OOE-001 2.5E+000 TL-1-15-028 12/31/2009 7.3E+000 pR/h
  • t 8.OOE-001 2.5E+000 TL-1-15-029 03/31/2010 1.1E+001 pR/h
  • t 1.20E+000 2.5E+000 TL-1-15-030 06/30/2010 7.3E+000 pJR/h t
  • 8.00E-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.

Results marked with t are greater than the Discrimination Level

Indicator Locations - n-I-I15 REMP TLD [Exposure Rate] Continued...

i ,e+o0i I e+o+,o / /

200Oe+OM

- Result - DIscrImnation Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-15-031 09/30/2010 7.8E+000 pRPh t

  • 8.OOE-001 2.5E+000 TL-1-15-032 12/31/2010 9,tE+000 pR/h t
  • 1.00E+000 2.5E+000 TL-1-15-033 03/31/2011 5.7E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-1-15-034 06/30/2011 8.3E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-15-035 09/30/2011 9.8E+000 pR/h t
  • 1.OOE+000 2.5E+000 TL-1-15-036 12/31/2011 7.4E+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

Figure 4.9 Indicator Locations - TLI-I- 6: REMP TLD [Exposure Rate]

I O0e+001 I -" -l

, oow. oo a NRD+Om

- 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 t* 1.22E+000 2ý5E+000 TL-1-16-002 06/30/2003 I.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 1t* 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 03/31/2005 8.1E+000 pR/h t 8.20E-001 2.5E+000 TL-1-16-010 06/30/2005 1.IE+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 1.1 E+001 pR/h t1 1.06E+000 2.5E+000 TL-1-16-016 12/31/2006 1.4E+001 pR/h t1 1.36E+000 25EH+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 7.6E+000 pR/h t
  • 7.60E-001 2.5E+000 TL-1-16-020 12/31/2007 8.1 E+000 pR/h t
  • 8.OOE-001 25E+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 t 8.OOE-001 2.5E+000 TL-1-16-024 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 t 8.OOE-001 2.5E+000 TL-1-16-026 06/30/2009 7.5E+000 pR/h t 8.OOE-001 2.5E+000 TL-1-16-027 09/30/2009 6.2E+000 pR/h t1 6.00E-001 2.5E+000 TL-1-16-028 12/31/2009 8.7E+000 pR/h 1t* 8.OOE-001 2.5E+000 TL-1-16-029 03/31/2010 1.1E+001 pR/h t"* 1.OOE+000 2.5E+000 TL-1-16-030 06/30/2010 6.8E+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

1,40+00 10*+1 A 103"M0 3,80e+OM 6 +00" 2O00"M

'S Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-16-031 09/30/2010 8.6E+000 pR/h t

  • 8.00E-001 2.5E+000 TL-1-16-032 12/31/2010 8.2E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-16-033 03/31/2011 7.2E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-1-16-034 06/30/2011 7.8E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-1-16-035 09/30/2011 1.1E+001 pR/h t
  • 1.OOE+000 2.5E+000 TL-1-16-036 12/31/2011 7.8E+000 pR/h t
  • 8.00E-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.

Results marked with t are greater than the Discrimination Level

Figure 4.10 Exposure Rate Trend at Control Location TL-0-36 Control Location - TL-0-36 REMP TLD [Exposure Rate]

I 200+03I 1i ,

1 0e+OQQ amO+=

z 00e+OWO

- Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-O-36-001 03/31/2003 7.9E+000 iJR/h t 1 .68E+000 2.5E+000 TL-O-36-002 06/30/2003 7.5E+000 iJR/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 MR/h t
  • 6.80E-001 2.5E+000 TL-O-36-005 03/31/2004 8.6E+000 pJR/h t
  • 6.80E-001 2.5E+000 TL-O-36-006 06/30/2004 6.3E+000 I.R/h t
  • 6.80E-001 2,5E+000 TL-O-36-007 09/30/2004 6.1E+000 MR/h t
  • 5.60E-001 2.5E+000 TL-O-36-008 12/31/2004 6.1 E+000 pR/h t
  • 4.80E-001 2.5E+000 TL-O-36-009 03/31/2005 8.1 E+000 IR/h t
  • 8.00E-001 2.5E+000 TL-O-36-010 06/30/2005 8.7E+000 MJR/h t
  • 8,60E-001 2.5E+000 TL-O-36-011 09/30/2005 1.OE+001 pJR/h t
  • 1.OOE+000 2.5E+000 TL-O-36-012 12/31/2005 8.OE+000 iR/h f
  • 8.OOE-001 2.5E+000 TL-O-36-013 03/31/2006 6.6E+000 MR/h t
  • 6.60E-001 2.5E+000 TL-O-36-014 06/30/2006 7.7E+000 MR/h t
  • 7.60E-001 2.5E+000 TL-O-36-015 09/30/2006 7.2E+000 MR/h t
  • 7.20E-001 2.5E+000 TL-O-36-016 12/31/2006 1.1 E+001 MR/h t
  • 1.12E+000 2,5E+000 TL-O-36-017 03/31/2007 6.8E+000 MjR/h t
  • 6.80E-001 2.5E+000 TL-O-36-018 06/30/2007 7.2E+000 MR/h t
  • 7.20E-001 2.5E+000 TL-O-36-019 09/30/2007 7.3E+000 MjR/h t* 7.20E-001 2.5E+000 TL-O-36-020 12/31/2007 6.8E+000 MR/h t
  • 6.80E-001 2.5E+000 TL-O-36-021 03/31/2008 7.6E+000 MJR/h t
  • 8.OOE-001 2.5E+000 TL-O-36-022 06/30/2008 5.9E+000 MR/h t
  • 6.OOE-001 2.5E+000 TL-O-36-023 09/30/2008 5.1 E+000 MJR/h t
  • 6.OOE-001 2.5E+000 TL-O-36-024 12/31/2008 6.3E+000 pR/h t
  • 6.OOE-001 2.5E+000 TL-O-36-025 03/31/2009 6.6E+000 MR/h t
  • 6.OOE-001 2.5E+000 TL-O-36-026 06/30/2009 6.5E+000 MJR/h t* 6.OOE-001 2.5E+000 TL-O-36-027 09/30/2009 5.8E+000 MJR/h t
  • 6.OOE-001 2.5E+000 TL-O-36-028 12/31/2009 5.9E+000 MR/h t* 6.OOE-001 2.5E+000 TL-O-36-029 03/31/2010 7.4E+000 pR/h t
  • 8.OOE-001 2.5E+000 TL-O-36-030 06/30/2010 5.OE+000 pR/h t
  • 6.OOE-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.

Results marked with " are greater than the Discrimination Level

Control Location - TL-0-36 : REMP TLD [Exposure Rate] Continued...

1Ooe+001 S2Xe+O31 2 00e+ODD Result - Discr*ination Le",e Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-O-36-031 09/30/2010 5.2E+000 pR/h t* 6.OOE-001 2.5E+000 TL-O-36-032 12/31/2010 6.4E+000 pR/h t

  • G.00E-001 2.5E+000 TL-O-36-033 03/31/2011 6.7E+000 pR/h t
  • 6.00E-001 2.5E+000 TL-O-36-034 06/30/2011 6.2E+000 ijR/h t
  • 6OOE-001 2.5E+000 TL-O-36-035 09/30/2011 7.7E+000 pR/h t
  • 8.00E-001 2.5E+000 TL-O-36-036 12/31/2011 7.1 E+000 pR/h t
  • 8.O0E-001 2.5E+000 Results marked with
  • are greater than 2 Sigma Error.

Results marked with t are greater than the Discrimination Level

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 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 iAVLAP 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 2011 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 likey!:ca.ion for exposure to a member of the public from the ISFSI is along the Beck River, Bailey Cove or Montsweag Bay for boating and fishing and the mud flats in the Cove or Bay exposed at low tides which is worked by clam diggers and wcrm 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 1.7 mrem. This value is only 7 percent of the 25 mrern per %fear 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 34.
3. 40 CFR Part 190, "Environmental Radiation Protection Standards for Nuclear Power Operation".
4. 10 CFR Part 72.104, "Criteria for R&dioactive Materials in Effluents and Direct Radiation from an ISFSI or M4RS".
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