RA-09-012, Maine Yankee Independent Spent Fuel Storage Installation, Annual Radiological Environmental Operating Report, January - December 2008

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Maine Yankee Independent Spent Fuel Storage Installation, Annual Radiological Environmental Operating Report, January - December 2008
ML090890740
Person / Time
Site: Maine Yankee, 07100465
Issue date: 03/31/2009
From:
Radiological Safety & Control Services
To:
Maine Yankee Atomic Power Co, Office of Nuclear Material Safety and Safeguards
References
MN-09-009, RA-09-012
Download: ML090890740 (30)
v • d • e


Text

MAINE YANKEE INDEPENDENT SPENT FUEL STORAGE INSTALLATION License No. DPR-36 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT January -December 2008 March 2009 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 Facility.

The Radiological Environmental Monitoring Program (REMP) for the Maine Yankee ISFSI located in Wiscasset, ME was continued for the period January through December 2008 in compliance with the Maine Yankee Off-Site Dose Calculation Manual (ODCM).No changes were made to the ODCM during 2008. 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 2008 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.In 2007 and again in 2008, samples were collected from Outfall-018.

The collection and analysis of these water samples is not required by the Off-site Dose Calculation Manual;however, it is a requirement found in the REMP implementing procedure. These samples were collected and analyzed using the same protocol for standard REMP samples. Review of the results of the samples collected in 2007 and 2008 show no impact from operation of the ISFSI on the environment.

Because this sample is not a requirement specified in the ODCM, the results will no longer be presented in this report.The Outfall-018 sample results reported in the 2007 Annual Radiological Environmental Operating Report were actually from 2006. See Section 7, Correction to the 2007 Annual Report, for details and a sample results table.ii TABLE OF CONTENTS Section Title Paqe

1.0 INTRODUCTION

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

I 2.0 GENERAL ISFSI AND SITE INFORMATION

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

2 3.0 PROGRA M DESIGN ........................................................................

2 3.1 M ONITO RING ZO NES .....................................

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

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

2 3.2 PATHWAYS MONITORED

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

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

3

3.3 DESCRIPTION

OF MONITORING PROGRAM .....................................................

3 4.0 RADIOLOGICAL DATA

SUMMARY

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

8 5.0 ANALYSIS OF ENVIRONMENTAL RESULTS ................

23 5.1 SAMPLING PROGRAM DEVIATIONS

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

23 5.2 DIRECT RADIATION PATHWAY .....................................................................

23

6.0 REFERENCES

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

24 7.0 CORRECTION TO THE 2007 ANNUAL REPORT ........................

24 iii LIST OF TABLES Table Title Page 3.1 Radiological Environmental Monitoring Program ............................

43.2 Radiological Environmental Monitorihg Locations

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

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

5 4.1 TLD Measurements by Quarter .........................................................

9 4.2 Exposure Rates from TLD Measurements

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

10 4.3 TLD Data Summary...................................................................

11 4.4 Direct Dose from ISFSI Operations

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

. 12 7.1 2007 Outfall-018 Sample Results Summary ....................................

25 iv LIST OF FIGURES Figure Title P 3.1 Radiological Environmental Monitoring Locations (w ith in 0 .2 8 8 km ) .......................................................................

6 3.2 Direct Radiation Monitoring Locations (o u ts id e 1 k m ) ...............................

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

........ 7 4.1 Exposure Rate Trend at TL-1-02 .............................................

13 4.2 Exposure Rate Trend at TL-1-04 ............................................

14 4.3 Exposure Rate Trend at TL-1-06 .............................................

15 4.4 Exposure Rate Trend at TL-1-08 .............................................

16 4.5 Exposure Rate Trend at TL-1-10 .............................................

17 4.6 Exposure Rate Trend at TL-1-12 ............................................

18 4.7 Exposure Rate Trend at TL-1-14 ...............................................

19 4.8 Exposure Rate Trend at TL-1-15 .............................................

20 4.9 Exposure Rate Trend at TL-1-16 ..........................

21 4.10 Exposure Rate Trend at Control Location TL-O-36........

..... 22 v

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 2008. 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 plant, and maps showing the location of each of the TLD monitoring locations.

Section 4: Section 5: 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.Section 6: References Section 7: Provides detail on an error in the 2007 Annual Report along with the corrected sample results.Page 1 of 25 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 DESDGN 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 2 of 25 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 2008 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, five 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 3 of 25 Table 3.1 Radiological Environmental Monitoring Program Exposure Collection Analysis Pathway Pathway Number of Routine and/or Numbler of auine 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 4 of 25 Table 3.2 Radiological Environmental Monitoring Locations Station Code TL-O-36 TL-1-02 TL-I-04 TL-I-06 TL-1-08 TL-I-10 TL-1-12 TL-1-14 TL-1-15 TL-1-16 Station Description Wiscasset Fire Station (0)Spent Fuel Storage (I)**Spent Fuel Storage (I)**Spent Fuel Storage (I)**Spent Fuel Storage (I)**Spent Fuel Storage (I)**Spent Fuel Storage (I)**Spent Fuel Storage (l)**Spent Fuel Storage (I)**Spent Fuel Storage (I)**Distance Zone* From ISFSI (km)2 5.2 Direction From ISFSI NW 1 1 1 1 1 1 1:1 1< 0.28< 0.28< 0.28< 0.28< 0.28< 0.28< 0.28< 0.28-< 0.28 N NE E SE S SW"W WNW NW*2 = Control TLD;1 = Indicator TLD**= Inner Ring TLD; 0 = Outer Ring TLD Page 5 of 25 CD aY)0-hI X a.-0-n CDrn k) CD-0 0 0.WA'k( Y00<.E 5Fa £NV~4CtIN4HTAL JLE LGCA7GN'S Figure 3.2 Direct Radiation Monitoring Locations (outside I km)"Ii/ ///I)'I//1//( ~*1'Id?) Ni~.i*< I#11.'r Edr~J;Page 7 of 25 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 8 of 25 Table 4.1 TLD Measurements by Quarter (mR)Station ID TL-1-02 TL-I-04 TL-I-06 TL-I-08 TL-1-10 TL-1-12 TL-1-14 TL-1-15 TL-1-16 TL-O-36 TL-O-36a Direction N NE E SE S SW W WNW NW ControlControl Backup 1st Qtr 25 25 44 27 28 28 32 34 30 24 26 2nd Qtr 28 22 37 28 27 29 27 28 30 23 25 3rd Qtr 31 27 35 32 30 34 30 31 31 27 26 4th Qtr 33 36 38 37 34 NR 34 32 35 31 29 Note: NR = no result. The TLD at Station TL-1-12 in the 4 th quarter was damaged.Page 9 of 25 Table 4.2 Exposure Rates from TLD Measurements (pR per hour)Station ID TL-1-02 TL-I-04 TL-1-06 TL-1-08 TL-I-1 0 TL-1-12 TL-i-14 TL-1-15 TL-1-16 TL-O-36 Direction N NE E SE S SW W WNW NW Control 1st Qtr 7.6 7.6 16.4 8.5.9.0 9.0 10.8 11.7 9.9 7.6 2nd Qtr 7.9 4.9 12.3 7.9 7.4 8.4 7.4 7.9 8.9 5.9 3rd Qtr 7.1 5.3 9.0 7.6 6.7 8.5 6.7 7.1 7.1 5.1 4th Qtr Annual Ave 7.6 7.5 8.9 6.7 9.8 11.9 9.4 8.3 8.0 7.8 8.6 8.0 8.2 7.2 8.5 8.5 8.6 6.3 6.2 Page 10 of 25 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)*

8.4 6.2 TL-I-06 11.9 (4.9-16.4)

(5.1-7.6)

(9.0-16.4)

(35) (8) (4)* Each "measurement" is based on quarterly readings Page 11 of 25 Table 4.4 Direct Dose from ISFSI Operations (mrem)Q1 Q2 Q3 Q4 Station ID TL-1-02 TL-1-04 TL-1-06 TL-I-08 TL-1-10 TL-I-12 TL-1-14 TL-1-1 5 TL-I-1 6 Net TLD Result 0.0 0.0 19.0 2.0 3.0 3.0 7.0 9.01 5.0 Calculated Dose 0.0 0.0 0.3 0.0 0.0 0.0 0.1 0.1 0.1 Net TLD Result 4.0 0.0 13.0 4.0 3.0 5.0 3.0 4.0 6.0 Calculated Dose 0.2 0.0 0.8 0.2.0.2 0.3 0.2 0.2 0.4 Net TLD Result 4.5 0.5 8.5 5.5 3.5 7.5 3.5 4.5 4.5 Calculated Dose 0.3 0.0 0.5 0.3 0.2 0.4 0.2 0.3 0.3 Net TLD Result 3.0 6.0 8.0 7.0 4.0 4.0 2.0 5.0 Calculated Dose 0;0 0.1 0.1 0.1 0.1 0.1 0.0 0.1 Annual Dose 0.5 0.1 1.7 0.7 0.5 0.8 0.5 0.7 0.8 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.Page 12 of 25 Figure 4.1 Exposure Rate Trend at TL-I-02 Trend.Report 02/2712009 Displays:

Samples collected between 03/31/2003 and ,l1/0,/2009" Indicator Locations

-TL-1-02: REMP TILD [Exposure Rate].3:31 3'31 34)1 331 I3&31 &33i Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-02-001 TL-I-02-002 TL-I-02-003 TL-I-02-004 TL-I-02-005 TL-1-02-006 TL-1-02-007 TL-1-02-008 TL-I-02-009 TL-I-02-010 TL-1-02-011 TL-I-02-012 TL-1-02-013 TL-I-02-014

TL-I-02-015 TL-I-02-016 TL-1-02-017 TL-1-02-018 TL-I-02-019 TL-I-02-020 TL-1-02-021

TL-1-02-022 TL-I-02-023 TL-I-02-024 03/31/2003 06/30/2003

09/30/2003 12/31/2003 03/31/2004

06/30/2004 09/30/2004 12/31/2004 03/31/2005

06/30/2005

09/30/2005 12/31/2005 03/31/2006 06/30/2006 09/30/2006 12/31/2006 03/3112007 06/30/2007

09/30/2007 12/31/2007 03/31/2008 06/30/2008 09/30/2008 12/31/2008 5.4E+000 pR/ht*8.OE+000 pR/ht*6.9E+000 pR/ht*8.5E+000 pR/ht*6.4E+000 pR/ht*8.3E+000 pR/ht*6.2E+000 pR/ht*6.8E+000 pR/ht*8.6E+000 pR/ht*7.8E+000 pR/ht*1.IE+001 pR/ht*8.OE+000 pR/ht*8.4E+000 pR/ht*7.9E+000 pR/ht*8.8E+000 pR/ht*1.2E+001 pR/ht*7.4E+000 pR/ht*8.1 E+000 pR/ht*7.OE+000 pR/ht*7.6E+000 pR/ht*7.6E+000 pR/ht*7.9E+000 pR/ht*7.1 E+000 pR/ht*7.6E+000 pR/ht*1.1 8E+000 1.10E+000 1.OOE+000 9.OOE-001 8.20E-001 8.OOE-001 6.60E-001 7.40E-001 8.60E-001 7.80E-001 1 .08E+000 8.OOE-001 8.40E-001 7.80E-001 8.80E-001 1.16E+000 7.40E-001 8.OOE-001 7.OOE-001 7.60E-001 8.OOE-001 8.00E-0011 8MOE-001 8.0OE-001 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 Results marked with

  • are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 13 of 25 Figure 4.2 Exposure Rate Trend at TL-I-04'Trend Report'>.

I -02/27/2009, Displays:

Samples collected between03/31/2003 and 01/01/2009 Indicator Locations

-TL-1-04: REMP TLD [Exposure Rate]I .. -.) ,I ,..313 3'31 3.31 '31 3'31 3,31--Result = Dlscrtmlnatlon Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-04-001 TL-1-04-002 TL-1-04-003 TL-1-04-004 TL-I-04-005 TL-1-04-006 TL-1-04-007 TL-1-04-008 TL-1-04-009

TL-I-04-01 0 TL-1-04-011 TL-1-04-01 2 TL-1-04-013 TL-1-04-014 TL-1-04-015 TL-I-04-016

TL-I-04-017 TL-I-04-018 TL-i-04-019 TL-1-04-021 TL-1-04-022 TL-1-04-023 TL-1-04-024 03/31/2003

06/30/2003 09/30/2003 12/31/2003 03/31/2004 06/30/2004 09/30/2004 12/31/2004 03/31/2005 06/30/2005

09/30/2005 12/31/2005 03/31/2006 06/30/2006 09/30/2006 12/31/2006 03/31/2007 06/30/2007 09130/2007 03/31/2008 06/30/2008 09/30/2008 12/31/2008 5.1 E+000 pR/ht*8.4E+000 pR/ht*6.5E+000 pR/ht*8.3E+000 pR/ht*6.9E+000 pR/ht*7.8E+000 pR/ht*6.3E+000 pR/ht*6.3E+000 pR/h"*8.6E+000 pR/ht*8.2E+000 pR/ht*9.1 E+000 pR/ht*8.0E+000 pR/ht*6.9E+000 pR/h'r 7.5E+000 pR/ht*8.4E+000 pR/ht*1.2E+001 pR/ht*7.0E+000 pR/ht" 6.7E+000 pR/ht*5.9E+000 pR/ht*7.6E+000 pR/ht*4.9E+000 pR/ht'5.3E+000 pR/ht*8.9E+000 jR/h"*1.26E+000 1.02E+000 7.20E-001 1.1i4E+000 7.80E-001 1.08E+000 6.20E-001 4.20E-001 8.60E-001 8.20E-001 9.00E-001 8.00E-001 6.80E-001 7.40E-001 8.40E-001 1.16E+000 7.OOE-001 6.60E-001 6.00E-001 8.OOE-001 4.OOE-001 6.00E-001 8.00E-001* 2.5E+000 25E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 Results marked with are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 14 of 25 Figure 4.3 Exposure Rate Trend at TL-I-06 Trend Report 02/27/2009Oo Displays:

Samples collected between. 03/31 /2003 and ,01/01/2009 IndicatorLocations

-TL-1-06: REMP TLD [Exposure Rate]l.JC*4(.31 i ).;: i 3.31 3:31 3'31 3,31 -.331 3,31-Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-06-001 TL-1-06-002 TL-1-06-003 TL-1-06-004 TL-1-06-005 TL-1-06-006 TL-1-06-007 TL-1-06-008 TL-1-06-009 TL-1-06-01 0 TL-1-06-011 TL-1-06-012 TL-1-06-013 TL-1-06-014 TL-1-06-015

TL-1-06-016 TL-1-06-017 TL-1-06-018 TL-1-06-019 TL-1-06-020

TL-1-06-021 TL-1-06-022 TL-1-06-023 TL-1-06-024 03/31/2003 06/30/2003 09/30/2003 12/31/2003 03/31/2004 06/30/2004 09/30/2004 12/31/2004 03/31/2005

06/30/2005

09/30/2005 12/31/2005 03/31/2006 06/30/2006

.09/30/2006 12/31/2006 03/31/2007 06/30/2007 09/30/2007 12/31/2007 03/31/2008 06/30/2008 09/30/2008 12/31/2008 7.1 E+000 IJR/ht*9.6E+000 PR/ht*9.1 E+000 pR/ht*1.2E+001 pR/ht*9.6E+000 pR/ht*1.1E+001 pR/ht*9.7E+000 pR/ht*9.6E+000 pR/ht*1.1E+001 pJR/ht*1.4E+001 pRiht*i.2E+001 pR/ht*1:OE+001 pR/ht*1.6E+001 pRJht*1.1 E+001 pR/ht*1.4E+001 pR/ht*1.2E+001 pR/ht" 1.1 E+001 pR/ht*1.OE+001 pR/ht*1.2E+001 pR/ht*1.2E+001 pR/ht°1.6E+001 pR/ht*1.2E+001 pR/ht" 9.OE+000 pIR/ht*9.8E+000 pR/ht*1.36E+000 1.OOE+000 1.46E+000 1.16E+000 9.40E-001 1.72E+000 1.20E+000 1.24E+000 1.12E+000 1.38E+000 1.18E+000 1.04E+000 1.48E+000 1.12E+000 1.40E+000 1.16E+000 1.10E+000 1.OOE+000 1.18E+000 1.22E+000 1-60E+000 1.20E+000 8.00E-001 1.OOE+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 215E+000 Results marked with

  • are greater than 2 Sigma Error.Results marked with t are greater than the Discrimination Level Page 15 of 25 Figure 4.4 Exposure Rate Trend at TL-I-08 Trend-Report 02/27/20,09~

Displays Samples collected

/2003 and 01/ /01/2009 Indicator Locations

-TL-1-08: REMP TLD [Exposure Rate]I II no.ý+Oy-i I Xi .-1 -Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-08-001 03/31/2003 5.2E+000 pR/ht* 1.18E+000 2.5E+000 TLdI-08-002 06/30/2003 8.4E+000 pR/ht* 1.24E+000 2.5E+000 TL-I-08-003 09/30/2003 6.5E+000 pR/ht° 9.20E-001 2.5E+000 TL-1-08-004 12/31/2003 9.4E+000 pR/ht* 1.OOE+000 2.5E+000 TL-1-08-005 03/31/2004 8.2E+000 pR/ht* 1.14E+000 2.5E+000 TL-1-08-006 06/30/2004 8.2E+000 PR/ht* 1.14E+000 2.5E+000 TL-I-08-007 09/30/2004 6.7E+000 pR/ht* 5.80E-001 2.5E+000 TL-I-08-008 12/31/2004 6.8E+000 pR/ht* 5.40E-001 2.5E+000 TL-I-08-009 03/31/2005 1.OE+001 pR/ht* 1.02E+000 2.5E+000 TL-1-08-010 06/30/2005 9.1 E+000 pR/ht* 9.20E-001 2.5E+000 TL-1-08-011 09/30/2005 1.1E+001 pR/ht* 1-08E+000.

2.5E+000 TL-1-08-012 12/31/2005 8.OE+000 pR/ht* 8.OOE-001 2.5E+000 TL-1-08-013 03/3112006 9.3E+000 pR/ht* 9.40E-001 2.5E+000 TL-1-08-014 06/30/2006 7.OE+000 pR/ht* 7.OOE-001 2.5E+000 TL-1-08-015 09/30/2006 1.IE+001 pR/ht* 1.08E+000 2.5E+000 TL-1-08-016

.12/31/2006 1.6E+001 pR/ht* 1.56E+000 2.5E+000 TL-1-08-017 03/31/2007 7.4E+000 pR/ht* 7.40E-001 2.5E+000 TL-1-08-018 06/30/2007 8.1 E+000 pR/ht* 8.OOE-001 2.5E+000 TL-I-08-019 09/30/2007 8.6E+000 pR/ht* 8.60E-001 2.5E+000 TL-I-08-020 12/31/2007 8.5E+000 pR/ht* 8.40E-001 2.5E+000 TL-I-08-021 03/31/2008 8.5E+000 pR/ht° 8.OOE-001 2.5E+000 TL-I-08-022 06/30/2008 7.9E+000 pR/h"* 8.OOE-001 2.5E+000 TL-I-08-023 09/30/2008 7.6E+000 pR/ht* 8.OOE-001 2.5E+000 TL-1-08-024 12/31/2008 9.4E+000 pR/hl* 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 16 of 25 Figure 4.5 Exposure Rate Trend at TL-I-10 Trend Report,' 02/27/2009 Displays:

Samples collected between 03]31/2003 and 01/01/2009' Indicator Locations

-TL-1-1 0: REMP TLD [Exposure Rate]I.*4430I&:1331 &'31

'-Result Level Sample Name Date Collected Result 2 Sigma Erro~r Dlscrdmlnatlon Level TL-I-10-001 TL-1-10-002 TL-1-10-003 TL-1-10-004 TL-1-10-005 TL-1-10-006 TL-1-10-007 TL-1-10-008 TL-1-10-009 TL-I-10-010 TL-1-1 0-011 TL-1-10-012 TL-1-10-013 TL-1-10-014 TL-1-10-015 TL-1-10-016 TL-1-10-017

TL-1-10-018 TL-1-10-019 TL-1-10-020 TL-1-10-021 TL-1-10-022 TL-1-10-023 TL-1-10-024 03/31/2003 06/30/2003 09/30/2003 12/31/2003 03/31/2004 06/30/2004 09/30/2004 12/31/2004 03/31/2005 06/30/2005 09/30/2005 12/31/2005 03/31/2006

06/30/2006 09/30/2006 12/31/2006 03/31/2007

06/30/2007 09/30/2007 12/31/2007 03/31/2008 06/30/2006 09/30/2008 12/31/2008 5.2E+000 pR/ht*8.2E+000 pR/ht*6.4E+000 pR/ht*8.9E+000 pR/ht*6.9E+000 pR/ht*7.7E+000 pR/ht*6.5E+000 pR/ht*6.5E+000 pR/ht*8.1 E+000 pR/htP 8.2E+000 pR/ht*1.OE+001 pR/ht*8.OE+000 pR/hf*7.4E+000 pR/h"*6.6E+000 pR/h"*8.4E+000 pR/hl*1.2E+001 pR/h"*7.OE+000 pR/hl*9.OE+000 pR/h"*9.2E+000 pR/h"*7.6E+000 pR/ht*9.OE+000 pR/hl*7.4E+000 pR/h"*6.7E+000 pR/hl*8.0E+000 pR/hl*1.18E+000 1.04E+000 1.10E+000 8.60E-001 8.60E-001 1.06E+000 8.40E-001 9.60E-001 8.20E-001 8.20E-001 1.OOE+000 8.OOE-001 7.40E-001 6.60E-001 8.40E-001 1.16E+000 7.OOE-001 9.OOE-001 9.20E-001 7.60E-001 8.OOE-001 8.OOE-001 6.OOE-001 8.OOE-001 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.511+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 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 25 Figure 4.6 Exposure Rate Trend at TL-I-12 Trend Report 02/27/2009 Displays:

Samples collected between 03,/31 /2003'and 01/01 /2009 Indicator Locations

-TL-1-1 2: REMP TLD [Exposure Rate]13 al" Ia' I QI I Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-12-001 TL-1-12-002 TL-1-12-003 TL-1-1-2-004 TL-1-12-005 TL-1-12-006 TL-1-12-007 TL-1-12-008 TL-1-12-009 TL-1-12-010 TL-1-12-011 TL-1-12-012 TL-1-12-013 TL-1-12-014 TL-1-12-015 TL-1-12-016 TL-1-12-017

TL-1-12-018 TL-1-12-019 TL-I-12-020 TL-1-12-021

TL-1-12-022 TL-1-12-023 03/31/2003 06/30/2003 09/30/2003 12/31/2003 03/31/2004 06/30/2004 06/30/2004 1 2/31/2004 03/31/2005 06/30/2005 09/30/2005 12/31/2005 03/31/2006 06/30/2006 09/30/2006 12/31/2006 03/31/2007 06/30/2007 09/30/2007 12/31/2007 03/31/2008 06/30/2008 09/30/2008 6.7E+000 pR/ht*9.7E+000 pR/ht*8.3E+000 pR/ht*9.8E+000 pR/ht*7.7E+000 pR/ht*1.OE+001 pR/ht*7.6E+000 pR/ht*7.1E+OOO pR/ht*7.6E+000 pR/ht*8.7E+000 pR/ht*9.1 E+000 pR/ht*8.8E+000 pR/ht*8.4E+000 p R/hh*6.6E+000 pR/h"*8.8E+000 pR/h1*1.3E+001 pR/ht'7.4E+000 pR/ht*7.2E+000 pR/ht*7.OE'000 pRiht*7.6E+000 pR/ht*9.OE+000 pR/h"*8.4E+000 pR/ht*8.5E1+000 pR/ht" 1.30E+000 1.38E+000 1.14E+000 7.80E-001 1.50E+000 1.14E+000 7.OOE-001 7.40E-001 7.60E-001 8.60E-001 9.00E-001 8.80E-001 8.40E-001 6.60E-001 8.80E-001 1.26E+000 7.40E-001 7.20E-001 7.00E-001 7.60E-001.8.00E-001 8.00E-001 8.00E-001 2.51+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 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 25 Figure 4.7 Exposure Rate Trend at TL-I-14 Tren 'd Report "..0227 272009 Displays:

Samples collected between 03/31/,/2003 and 01/01/12009 Indicator Locations

-TL-I-1 4: REMP TLD [Exposure Rate]I P DX. +r c. ... ....* 3,'31 331 &313 3'31 3'31-Result Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-14-001 TL-1-14-002 TL-1-14-003 TL-1-14-004 TL-1-14-005 TL-1-14-006 TL-1-14-007 TL-1-14-008 TL-1-14-009 TL-1-14-010 TL-1-14-011 TL-1-14-012 TL-1-14-013 TL-1-14-014

TL-1-14-015 TL-1-14-016 TL-1-14-017 TL-1-14-018 TL-1-14-019 TL-1-14-020 TL-1-14-021 TL-1-14-022 TL-1-14-023 TL-1-14-024 03/31/2003 06/30/2003 09/30/2003 12/31/2003 03/31/2004 06/30/2004 09/30/2004 12/31/2004 03/31/2005 06/30/2005 09/30/2005 12/31/2005 03/31/2006 06/30/2006 09/30/2006 12/31/2006 03/31/2007 06/30/2007 09/30/2007 12/31/2007 03/31/2008 06/30/2008 09/30/2008 12/31/2008 6.7E+000 pR/ht*9.2E+000 pR/ht*8.3E+000 pR/ht*9.7E+000 pR/ht*7.4E+000 pR/ht*9.8E+000 pR/ht*7.8E+000 pR/ht*7.8E+000 pR/ht*1.1 E+001 IjRht*9.6E+000 pR/ht*1.OE+001 pR/ht*1.OE+001 pR/ht*9.8E+000 pR/h1*9.6E+000 pR/ht*1.OE+001 pR/ht*1.4E+001 pR/ht*8.2E+000 pR/ht*8.1 E+000 pR/ht*8.1 E+060 pRht*8.1 E+000 pR/ht*1.IE+001 pR/ht*7.4E+000 pR/ht*6.7E+000 pR/ht*8.OE+000 pR/ht*1.26E+000 1.04E+000 9.20E-001 1.OOE+000 8.00E-001 1.28E+000 8.80E-001 9.20E-001 1.06E+000 9.60E-001 1.04E+000 1.OOE+000 9.80E-001 9.60E-001 1.02E+000 1.36E+000 8.20E-001 8.OOE-001 8.OOE-001 8.OOE-001 1.00E+000 8.00E-001 6.OOE-001 8.00E-001 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000, 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 2.5E+000 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 25 Figure 4.8 Exposure Rate Trend at TL-1-15 STrend Report 02/27/2009,, Displays:

samples collected between 03/31/2003 and 01 /O1/2009 Indicator Locations

-TL-1-1 5: REMP TLD [Exposure Rate]3*31 3*31 3131 3 &-Result -Discrimination Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-I-15-001 03/31/2003 7.1 E+000 pR/ht* 1.62E+000 2.5E+000 TL-1-15-002 06/30/2003 1.OE+001 pR/ht* 1.34E+000 2.5E+000 TL-1-15-003 09/30/2003 8.5E+000 pR/ht* 8.00E-001 2.5E+000 TL-1-15-004 12/31/2003 1.OE+001 pR/ht* 1.08E+000 2.5E+000 TL-1-15-005 03/31/2004 8.3E+000 pR/ht* 8.00E-001 2.5E+000 TL-1-15-006 06/30/2004 1.OE+001 pR/ht* 1.06E+000 2.5E+000 TL-1-1 5-007 09/30/2004 8.OE+000 pR/ht* 8.40E-001 2.5E+000 TL-1-15-008 12/31/2004 8.6E+000 pR/ht* .6.OOE-001 2.5E+000 TL-1-15-009 03/31/2005 9.1 E+000 pR/ht* 9.20E-001 2.5E+000 TL-1-15-010 06/30/2005 1.1E+001 pR/ht* 1.06E+000 2.5E+000 TL-1-15-011 09/30/2005 1.2E+001 pR/ht* 1.18E+000 2.5E+000 TL-I-15-012 12/31/2005 9.6E+000 pR/ht* 9.60E-001 2.5E+000 TL-I-15-013 03/31/2006 1.OE+001 pR/ht* 1.04E+000 2.5E+000 TL-I-15-014 06/30/2006 9.6E+000 pR/ht* 9.60E-001 2.5E+000 TL-1-15-016 09/30/2006 1.1 E+601 pR/ht* 1.06E+000 2.5E+000 TL-1-15-016 12/31/2006 1.2E+001 pR/ht* 1.16E+000 2.5E+000 TL-1-15-017 03/31/2007 9.OE+000 pR/ht* 9.OOE-001 2.5E+000 TL-1-15-018 06/30/2007 8.6E+000 pR/ht* 8.60.E-001

.2.5E+000 TL-1-15-019 09/30/2007 7.OE+000 pR/ht* 7.OOE-001 2.5E+000 TL-1-15-020 12/31/2007 8.1 E+000 pR/ht* 8.OOE-001 2.5E+000 TL-1-15-021 03/31/2008 1.2E+001 pR/ht* 1.20E+000 2.5E+000 TL-1-15-022 06/30/2008 7.9E+000 pR/ht* 8.OOE-001 2.5E+000 TL-1-15-023 09/30/2008 7.1 E+000 pR/htý 8.OOE-001 2.5E+000 TL-1-15-024 12/31/2008

.7.2E+000 pR/ht* 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 20 of 25 Figure 4.9 Exposure Rate Trend at TL-1-16 Trend Report ,02/27/2009I Displays:

Samples collected between 03/31/2003 and 01/01/2009

.Indicator Locations

-TL-1-1 6: REMP TLD [Exposure Rate]&I I-Result Dlscrtmlnation Level Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-1-16-001 03/31/2003 6.7E+000 pR/ht* 1.22E+000 2.5E+000 TL-1-16-002 06/30/2003 1.OE+001 pR/ht* 1.48E+000 2.5E+000 TL-1-16-003 09/30/2003 9.OE+000 pR/ht* 1.16E+000 2.5E+000 TL-1-16-004 12/31/2003 1.1E+001 pR/ht" 1.16E+000 2.5E+000 TL-1-16-005 03/31/2004 8.6E+000 pR/ht* 9.80E-001 2.5E+000 TL-1-16-006 06/30/2004 1.OE+001 pRFhht* 1.14E+000 2.5E+000 TL-1-16-007 09/30/2004 8.4E+000 IjR/ht* 1.16E+000 2.5E+000 TL-I-16-008 12/31/2004 8.8E+000 pR/ht* 8.80E-001 2.5E+000 TL-1-16-009 03/31/2005 8.1 E+000 pR/ht* 8.20E-001 2.5E+000 TL-1-16-010 06/30/2005 1.1E+001 JR/ht* 1.14E+000 2.5E+000 TL-1-16-011 09/30/2005 1.OE+001 pR/ht* 1.04E+000 2.5E+000 TL-1-16-012 12/31/2005 1.OE+001 pR/ht* 1.04E+000 2.5E+000 TL-1-16-013 03/31/2006 9.8E+000 pJR/ht* 9.80E-001 2.5E+000 TL-1-16-014 06/30/2006 9.6E+000 pR/ht* 9.60E-001 2.5E+000 TL-1-16-015 09/30/2006 1.IE+001 pR/ht* 1.06E+000 2.5E+000 TL-1-16-016 12/31/2006 1.4E+001 pR/ht* 1.36E+000 2.5E+000 TL-1-16-017 03/31/2007 8.6E+000 pR/ht* 8.60E-001 2.5E+000 TL-1-16-018 06/30/2007 9.5E+000 pR/ht* 9.60E-001 2.5E+000 TL-1-16-019 09/30/2007 7.5E+000 pRht* 7.60E-001 2.5E+000 TL-I-16-020 12/31/2007 8.1 E+000 pR/ht* 8.00E-001 2.5E+000 TL-1-16-021 03/31/2008 9.9E+000 pR/hl* 1.OOE+000 2.5E+000 TL-1-16-022 06/30/2008 8.9E+000 pR/h"* 8.OOE-001 2.5E+000 TL-1-16-023 09/30/2008 7.1 E+000 pR/h'* 8.00E-001 2.5E+000 TL-1-16-024 12/31/2008 8.5E+000 pR/ht* 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 Page 21 of 25 Figure 4.10 Exposure Rate Trend at Control Location TL-O-36'Trend ýReport ~0212712009 Displays:

Samples collecltled between,03,/3,1/?2003and 01/01/2009 Control Location -TL-0-36:

REMPTLD [Exposure Rate]--Result DiscriminationLevel 1 Sample Name Date Collected Result 2 Sigma Error Discrimination Level TL-O-36-001 03/31/2003 7.9E+000 pR/ht" 1.68E+000 2.5E+000 TL-O-36-002 06/30/2003 7.5E+000 IjR/h"* 1.04E+000 2.5E+000 TL-O-36-003 09/30/2003 7.8E+000 pR/h"* 1.34E+000 2.5E+000 TL-O-36-004 12/31/2003 6.8E+000 pR/ht* 6.80E-001 2.5E+000 TL-O-36-005 03/31/2004 8.6E+000 pR/ht* 6.80E-001 2.5E+000 TL-O-36-006 06/30/2004 6.3E+000 lJRlht* 6.80E-001 2.5E+000 TL-O-36-007 09/30/2004 6.1 E+000 pR/ht* 5.60E-001 2.5E+000 TL-O-36-008 12/31/2004 6.1 E+000 MR/hlt* 4.80E-001 2.5E+000 TL-O-36-009 03/31/2005 8.1 E+000 pR/h"* 8.00E-001 2.5E+000 TL-O-36-010 06/30/2005 8.7E+000 pR/ht* 8.60E-001 2.5E+000 TL-O-36-011 09/30/2005 1.OE+001 pR/ht* 1.OOE+000 2.5E+000 TL-O-36-012 12/31/2005 8.OE+000 JR/ht* 8.O0E-001 2.5E+000 TL-O-36-013 03/31/2006 6.6E+000 pR/ht* 6.60E-001 2.5E+000 TL-O-36-014 06/30/2006 7.7E+000 pR/ht* 7.60E-001 2.5E+000 TL-O-36-015 09/30/2006 7.2E+000 PR/ht* 7.20E-001 2.5E+000 TL-O-36-016 12/31/2006 1.1E+001 JR/ht* 1.12E+000 2.5E+000 TL-O-36-017 03/31/2007 6.8E+000 pR/ht* 6.80E-001 2.5E+000 TL-O-36-018 06/30/2007 7.2E+000 pR/ht* 7.20E-001 2.5E+000 TL-O-36-019 09/30/2007 7.3E+000 pR/ht* 7.20E-001 2.5E+000 TL-O-36-020 12/31/2007 6.8E+000 JR/ht* 6.80E-001 2.5E+000 TL-0-36-021 03/31/2008 7.6E+000 pR/ht* 8.00E-001 2.5E+000 TL-O-36-022 06/30/2008 5.9E+000 pR/ht* 6.OOE-001 2.5E+000 TL-O-36-023 09/30/2008 5.1 E+000 pR/h"* 6.OOE-001 2.5E+000 TL-O-36-024 12/31/2008 6.3E+000 pR/hp"* 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 22 of 25.

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 2008.

There is no data at location TL-1-12 for the 4th quarter.Although the TLD was deployed for the quarter, the dosimetry processor determined that the TLD was physically damaged and prevented readout.

The location of the TLD has 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 Page 23 of 25.

measurements.

As in previous years, the 2008 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 boating and fishing~and the mud flats in the Cove or Bay exposed at low tides which is worked by clam diggers and wormdiggers; 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 isat 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 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".

7.0 CORRECTION TO THE 2007 ANNUAL REPORT During a review of the 2007 Annual Radiological Environmental Operating Report, it was determined that 2006 Outfall-018 sample data was erroneously shown in Table 5.1 of the report.

A Condition Report was written to document the issue. The cause was determined to be personnel error and inattention to detail. Only one sample from Outfall-018 was collected in 2007. The sample was sent for gamma spec analysis.None of the results were positive.

A summary of the 2007 Outfall-018 sample results is shown on Table 7.1. A review of the correct results does not change the conclusions of the original report.Page 24 of 25 Table 7.1 2007 Ouffall-018 Sample Results Summary (pCi/L)Radionuclide Cs-1 34 Cs-137 Co-58 Co-60 Fe-59 Mn-54 Nb-95 Zr-95 Result-1.90E+00 6.70E-01-9.90E+00-2.70E+00 2.20E+01-2.80E+00 1.70E+01-4.70E+01 2 Sigma Error 3.59E+00 2.73E+00 2.41 E+01 2.86E+00 1.23E+02 4.08E+00 1.92E+02 4.39E+01 MDC 5.50E+00 4.80E+00 3.20E+01 3.70E+00 2.20E+02 6.OOE+00 3.30E+02 6.OOE+01 Page 25 of 25

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