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{{#Wiki_filter:MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0200 YARD EAST SURVEY UNIT 3 Prepared By: __ Date: sJar:,.P SEnginrSignature Printed Name Reviewed By: Date: 33 o0w HS fiQgnAnature Printed Name Reviewed By: W e? G v Date: 3 0si~ °Independent Review nature//7Printed arne Approved By: Date: _____PSSnted -Signature Printed Name Revision 0 MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0200 YARD EAST SURVEY UNIT 3 A. SURVEY UNIT DESCRIPTION FR-0200 Yard East Survey Unit 3 was located in the SE corner of the site, residing in the former "Industrial Area" yard. The 1687 m 2 area was bordered on the north by FR-0200 Survey Units 9 and 4 and on the west by FR-01 11 Survey Unit 17. Survey Unit 3 is bounded by FR-0200 Survey Unit I to the South and East. The survey unit is located within the current Restricted Area (RA) and includes a 4 meter wide buffer zone outside the RA. This survey unit is contained within the triangular coordinates 623965E, 407343N; 623992E, 407469N; and 624228E, 407418N using the Maine State Coordinate System (West Zone)NAD 1927. The location of the survey unit in relation to the Turbine Building and the proximate FR-0200 survey units is shown on map FR0200 REF (Attachment 1).Survey Unit 3 is an area composed primarily of soil and backfill, and is relatively flat.B. SURVEY UNIT DESIGN INFORMATION Survey Area FR-0200 was originally designed as a Class 3 area per LTP Revision 3. During decommissioning, the RA boundary was expanded to include a portion of FR-0200 including Survey Unit 3. Thus, Survey Unit 3 was reclassified to Class 1. Survey Unit 3 met the LTP Revision 3 definition for a Class I survey unit. The survey unit design parameters are shown in Table 1. Given a relative shift of 0.8, it was determined that 40 direct measurements were required for the Sign Test. (It was later realized that a higher DCGL for areas with only surface soil contamination could have been used, resulting in a requirement for only 18 direct measurements.)
{{#Wiki_filter:MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0200 YARD EAST SURVEY UNIT 3 Prepared By: __                           Date:   sJar:,.P SEnginrSignature Printed Name Reviewed By:                               Date: 33 o0w HS       fiQgnAnature Printed Name Reviewed By:   W e? G         v           Date: 3     ° 0si~
Because the measurement locations were based on a systematic square grid with a random start point, the N=40 design led to a survey unit map with 42 locations which are illustrated on map FR0200-3b (Attachment 1). Direct measurements (soil samples) were collected from required locations and analyzed with laboratory gamma spectroscopy instrumentation.
Independent Review     nature
In accordance with the LTP, scans covering 100% of the 1687 m 2 area were required for the Class I survey unit. This was accomplished by use of an in situ gamma spectroscopy detector (ISOCS) configured at a 3-meter distance from the surface to obtain overlapping 28-m 2 fields of view. The ISOCS detector was positioned perpendicular to the surface.Locations of the 90 survey scans are shown on map FRO200-3a (Attachment 1).The ISOCS scans were configured to ensure 100% scan coverage of all exposed surfaces within Survey Unit 3. The survey instruments used are listed by model and serial number in Attachment 2 (Table 2-1). Scan MDCs are also listed in Attachment 2 (Table 2-2) and are compared to the DCGL, the investigation level, and the DCGLEMC. The scan MDC is less than the scan investigation level, thus providing high confidence (95% or higher) that an elevated area would be detected in the scanning process. Further, since the investigation level was always less than the design DCGLEMC, no EMC sample size adjustment was necessary.
                          //7Printed arne Approved By:                               Date:   _____
FR-0200-03, Revision 0 Page 2 of 20 TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit j Design Criteria l Basis Area 1687 m 2  Class 1, < 2,000 m 2 Based on an LBGR of 1.2 Number of Direct 40 pCi/g, sigmal of 1.33 pCi/g and Measurements Required a relative shift of 0.8.2_ Type 1 = Type 11 = 0.05 Sample Area 42 m 2  1687 m /40 = 42 m Sample Grid Spacing 6.5 m (42)1/2 Scan Grid Area ISOCS scan at 3 meters See Section B Area Factor 1.6 Class I Area, LTP Table 6-12 Scan Area 1687 m 2  Class I Area -100%Background
PSSnted -Signature Printed Name Revision 0
_7, 2>K&sect; 77'1?'-i -SPA-3 (scan)..10 pCi/g Cs-137 ISOCS investigation levels with Scan Investigation Level 0.36 pCi/g Co-60 detector at 3-meter height 0.36 ~ifg o-60(Reference 6)DCGL 2.39 pCi/g Cs-137 (References 4 and 7)_____ _____ _____ _____ 0.86 pC i/g C o-60_ _ _ _ _ _ _ _ _ _ _ _ _3 DCGL x Area Factor for Class Design DCGLENMc 3.8 pCi/g Cs-137 1 survey unit, per LTP Section 5.6.3 C. SURVEY RESULTS A total of 42 direct measurements were performed in Survey Unit 3. One sample contained Cs-1 37 with levels of residual activity greater than the MDA but below the DCGL. No samples contained detectable Co-60 activity.
 
All other measurements were below the MDA.The results are presented in Table 2. No investigations were necessary or performed based on the direct measurement results.ISOCS gamma scans were performed at 90 locations using an investigation level of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. The gamma scans were performed for a sufficient count time to achieve a Minimum Detectable Activity (MDA) of approximately 25% of the DCGL. All identified scan activity levels and MDAs were below the investigation levels. Therefore, no investigation surveys were performed as a result of the scan surveys.LTP Revision 3, Table 5-IC for RCA Yard West, R0100 FR-0200-03, Revision 0 Page 3 of 20 TABLE 2 DIRECT MEASUREMENTS Sample Number Cs-137 (pCi/g) Uncertainty (pCi/g)FRO20003ISOOI  
MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0200 YARD EAST SURVEY UNIT 3 A. SURVEY UNIT DESCRIPTION FR-0200 Yard East Survey Unit 3 was located in the SE corner of the site, residing in the former "Industrial Area" yard. The 1687 m2 area was bordered on the north by FR-0200 Survey Units 9 and 4 and on the west by FR-01 11 Survey Unit 17. Survey Unit 3 is bounded by FR-0200 Survey Unit I to the South and East. The survey unit is located within the current Restricted Area (RA) and includes a 4 meter wide buffer zone outside the RA. This survey unit is contained within the triangular coordinates 623965E, 407343N; 623992E, 407469N; and 624228E, 407418N using the Maine State Coordinate System (West Zone)
< 5.97E-02 FR020003 1S002 < 3.53E-02 FR020003 I S003 < 4.36E-02 FR0200031S004  
NAD 1927. The location of the survey unit in relation to the Turbine Building and the proximate FR-0200 survey units is shown on map FR0200 REF (Attachment 1).
< 4.99E-02 FR0200031S005  
Survey Unit 3 is an area composed primarily of soil and backfill, and is relatively flat.
< 4.76E-02 FR0200031S006  
B. SURVEY UNIT DESIGN INFORMATION Survey Area FR-0200 was originally designed as a Class 3 area per LTP Revision 3. During decommissioning, the RA boundary was expanded to include a portion of FR-0200 including Survey Unit 3. Thus, Survey Unit 3 was reclassified to Class 1. Survey Unit 3 met the LTP Revision 3 definition for a Class I survey unit. The survey unit design parameters are shown in Table 1. Given a relative shift of 0.8, it was determined that 40 direct measurements were required for the Sign Test. (It was later realized that a higher DCGL for areas with only surface soil contamination could have been used, resulting in a requirement for only 18 direct measurements.) Because the measurement locations were based on a systematic square grid with a random start point, the N=40 design led to a survey unit map with 42 locations which are illustrated on map FR0200-3b (Attachment 1). Direct measurements (soil samples) were collected from required locations and analyzed with laboratory gamma spectroscopy instrumentation.
< 4.15E-02 FR0200031S007  
In accordance with the LTP, scans covering 100% of the 1687 m2 area were required for the Class I survey unit. This was accomplished by use of an in situ gamma spectroscopy detector (ISOCS) configured at a 3-meter distance from the surface to obtain overlapping 28-m2 fields of view. The ISOCS detector was positioned perpendicular to the surface.
< 4.66E-02_FR0200031S008
Locations of the 90 survey scans are shown on map FRO200-3a (Attachment 1).
< 5.63E-02 FR0200031S009  
The ISOCS scans were configured to ensure 100% scan coverage of all exposed surfaces within Survey Unit 3. The survey instruments used are listed by model and serial number in Attachment 2 (Table 2-1). Scan MDCs are also listed in Attachment 2 (Table 2-2) and are compared to the DCGL, the investigation level, and the DCGLEMC. The scan MDC is less than the scan investigation level, thus providing high confidence (95% or higher) that an elevated area would be detected in the scanning process. Further, since the investigation level was always less than the design DCGLEMC, no EMC sample size adjustment was necessary.
< 3.62E-02 FRO200031SO10 1.15E-01 3.82E-02 FRO200031SOII  
FR-0200-03, Revision 0 Page 2 of 20
< 5.35E-02 FR0200031S012  
 
< 5.40E-02 FR0200031S013  
TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit               j       Design Criteria           l                       Basis Area                               1687 m2                            Class 1, < 2,000 m2 Based on an LBGR of 1.2 Number of Direct                   40                                 pCi/g, sigmal of 1.33 pCi/g and Measurements Required                                                   a relative shift of 0.8.
< 4.94E-02 FR0200031S014  
2_                                     1 Type = Type 11 = 0.05 Sample Area                         42 m2                              1687 m /40 = 42 m Sample Grid Spacing                 6.5 m                               (42)1/2 Scan Grid Area                     ISOCS scan at 3 meters             See Section B Area Factor                         1.6                                 Class I Area, LTP Table 6-12 Scan Area                           1687 m2                            Class I Area - 100%
< 4.42E-02 FR0200031S015  
Background                                     2>K&sect;               _7,            77'1?'-i             -
< 5.32E-02 FR0200031S016  
SPA-3 (scan)
< 4.89E-02 FR020003 1S017 < 3.84E-02 FR0200031S018  
                                    ..10 pCi/g Cs-137                   ISOCS investigation levels with Scan Investigation Level           0.36 pCi/g Co-60                   detector at 3-meter height 0.36 o-60(Reference
< 4.18E-02 FR0200031SO19  
                                                    ~ifg                                  6)
< 4.96E-02 FR020003 1S020 < 4.59E-02 FR020003 1S021 < 5.05E-02 FR0200031S022  
DCGL                               2.39 pCi/g Cs-137                   (References 4 and 7)
< 5.15E-02 FR020003 1 S023 < 5.55E-02 FR020003 1S024 < 4.441E-02 FR020003 1S025 < 3.84E-02 FR020003 1 S026 < 3.89E-02 FR020003 I S027 < 4.23E-02 .FR020003 1S028 < 4.84E-02 FR020003 1S029 < 4.53E-02 FR0200031S030  
_____
< 5.68E-02 FRO200031S031  
_____   _____   _____     0.86 pC i/g C o-60_                   _   _ _     _   _ _   _ _ _   _ _ _
< 5.49E-02 FRO200031S032  
3DCGL x Area Factor for Class Design DCGLENMc                     3.8 pCi/g Cs-137                   1 survey unit, per LTP Section 5.6.3 C. SURVEY RESULTS A total of 42 direct measurements were performed in Survey Unit 3. One sample contained Cs-1 37 with levels of residual activity greater than the MDA but below the DCGL. No samples contained detectable Co-60 activity. All other measurements were below the MDA.
< 4.41E-02 FR0200031S033  
The results are presented in Table 2. No investigations were necessary or performed based on the direct measurement results.
< 4.74E-02 FR0200031S034  
ISOCS gamma scans were performed at 90 locations using an investigation level of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. The gamma scans were performed for a sufficient count time to achieve a Minimum Detectable Activity (MDA) of approximately 25% of the DCGL. All identified scan activity levels and MDAs were below the investigation levels. Therefore, no investigation surveys were performed as a result of the scan surveys.
< 5.88E-02 FR0200031S035  
LTP Revision 3, Table 5-IC for RCA Yard West, R0100 FR-0200-03, Revision 0 Page 3 of 20
< 6.70E-02 FR0200031S036  
 
< 6.03E-02 FR0200031S037  
TABLE 2 DIRECT MEASUREMENTS Sample Number           Cs-137 (pCi/g)       Uncertainty (pCi/g)
< 6.51E-02 FR0200031S038  
FRO20003ISOOI           <         5.97E-02 FR020003 1S002           <         3.53E-02 FR020003 I S003         <         4.36E-02 FR0200031S004           <         4.99E-02 FR0200031S005           <         4.76E-02 FR0200031S006           <         4.15E-02 FR0200031S007           <         4.66E-02_
< 5.42E-02 FR0200031S039  
FR0200031S008          <         5.63E-02 FR0200031S009           <         3.62E-02 FRO200031SO10                     1.15E-01         3.82E-02 FRO200031SOII           <         5.35E-02 FR0200031S012           <         5.40E-02 FR0200031S013           <         4.94E-02 FR0200031S014           <         4.42E-02 FR0200031S015           <         5.32E-02 FR0200031S016           <         4.89E-02 FR020003 1S017         <         3.84E-02 FR0200031S018           <         4.18E-02 FR0200031SO19           <         4.96E-02 FR020003 1S020         <         4.59E-02 FR020003 1S021         <         5.05E-02 FR0200031S022           <         5.15E-02 FR020003 1S023          <         5.55E-02 FR020003 1S024         <         4.441E-02 FR020003 1S025         <         3.84E-02 FR020003 1S026          <         3.89E-02 FR020003 I S027         <         4.23E-02 .
< 4.1OE-02 FR0200031S040  
FR020003 1S028         <         4.84E-02 FR020003 1S029         <         4.53E-02 FR0200031S030           <         5.68E-02 FRO200031S031           <         5.49E-02 FRO200031S032           <         4.41E-02 FR0200031S033           <         4.74E-02 FR0200031S034           <         5.88E-02 FR0200031S035           <         6.70E-02 FR0200031S036           <         6.03E-02 FR0200031S037           <         6.51E-02 FR0200031S038           <         5.42E-02 FR0200031S039           <         4.1OE-02 FR0200031S040           <         5.67E-02 FR0200031S041           <         4.55E-02 FR020003 I S042         <         7.24E-02 Mean                 5.12E-02 Median                 4.92E-02 Standard Deviation           131E-02 Range           3.53E-02 to 1.15E-O1
< 5.67E-02 FR0200031S041  
"<" indicates MDA value. Bold indicates positive detection value.
< 4.55E-02 FR020003 I S042 < 7.24E-02 Mean 5.12E-02 Median 4.92E-02 Standard Deviation 131E-02 Range 3.53E-02 to 1.15E-O1"<" indicates MDA value. Bold indicates positive detection value.No Co-60 detected above an MDA of 0.1 pCi/g.FR-0200-03, Revision 0 Page 4 of 20 D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS Based on the scan results, no investigations were required.E. SURVEY UNIT DATA ASSESSMENT An analysis of the direct sample measurement results, including the mean, median, standard deviation, and sample result range, is provided in Table 2. Positively detected values are bolded in the table. Ofthe 42 soil samples collected, one identified Cs-137 activity below the DCGL value of 2.39 pCi/g and no samples identified Co-60 activity.
No Co-60 detected above an MDA of 0.1 pCi/g.
All other values were below the MDA. Identified sample activities or Minimum Detectable Activities are listed in Table 2. The mean and median activities were less than the DCGL for Cs-137. The average of the Cs-1 37 measurements was 0.051 pCi/g, indicating that the direct measurements averaged 2.1% of the DCGL limit.For illustrative purposes, as indicated in LTP Section 5.9.3, a simplified general retrospective dose estimate can be calculated from the average residual contamination level by subtracting the mean fallout Cs-137 value (0.19 pCi/g)2 for disturbed soil from the survey unit sample mean activity (0.051 pCi/g). This would equate to an annual dose rate of 0.0 mrem/year.
FR-0200-03, Revision 0 Page 4 of 20
Also, for purposes of demonstrating compliance with the radiological criteria for license termination and the enhanced State of Maine criteria, background activity was not subtracted from the sample analysis activity values.F. ADDITIONAL DATA EVALUATION Attachment 4 provides additional data evaluation associated with this Survey Unit, including relevant statistical information.
 
Based on survey unit direct measurement data, this attachment provides the Sign Test Summary, Quantile Plot, Histogram, and Retrospective Power Curve.I. The Sign Test Summary provides an overall summary of design input (Table 1) and resulting calculated values used to determine the required number (N) of direct measurements (per LTP Section 5.4.2). The Sign Test Summary is a separate statistical analysis that also calculates the mean, median, and standard deviation of the direct measurements.
D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS Based on the scan results, no investigations were required.
The critical value and the result of the Sign Test are provided in the Sign Test Summary table, as well as a listing of the key release criteria.
E. SURVEY UNIT DATA ASSESSMENT An analysis of the direct sample measurement results, including the mean, median, standard deviation, and sample result range, is provided in Table 2. Positively detected values are bolded in the table. Ofthe 42 soil samples collected, one identified Cs-137 activity below the DCGL value of 2.39 pCi/g and no samples identified Co-60 activity. All other values were below the MDA. Identified sample activities or Minimum Detectable Activities are listed in Table 2. The mean and median activities were less than the DCGL for Cs-137. The average of the Cs-1 37 measurements was 0.051 pCi/g, indicating that the direct measurements averaged 2.1% of the DCGL limit.
The direct measurements clearly pass the Sign Test. As discussed in Section E, the subject release criteria have been satisfied.
For illustrative purposes, as indicated in LTP Section 5.9.3, a simplified general retrospective dose estimate can be calculated from the average residual contamination level by subtracting the mean fallout Cs-137 value (0.19 pCi/g) 2 for disturbed soil from the survey unit sample mean activity (0.051 pCi/g). This would equate to an annual dose rate of 0.0 mrem/year.
In addition, the sample standard deviation is smaller than the design sigma; therefore, no additional samples were required.2. The Quantile Plot was generated from the unity data listed in Table 2. The data set and plot are consistent with expectations for a Class I survey unit. All of the measurements are below the DCGL of 2.39 pCi/g for Cs-137.2 See Attachment E to Maine Yankee Procedure PMP 6.7.8 (Reference 5).FR-0200-03, Revision 0 Page 5 of 20
Also, for purposes of demonstrating compliance with the radiological criteria for license termination and the enhanced State of Maine criteria, background activity was not subtracted from the sample analysis activity values.
: 3. A Histogram Plot wvas also developed.
F. ADDITIONAL DATA EVALUATION Attachment 4 provides additional data evaluation associated with this Survey Unit, including relevant statistical information. Based on survey unit direct measurement data, this attachment provides the Sign Test Summary, Quantile Plot, Histogram, and Retrospective Power Curve.
This plot shows a log-normal distribution with one outlier.4. A Retrospective Power Curve was constructed, based on FSS results. The curve shows that this survey unit having a mean residual activity at a small fraction of the DCGL has a high probability
I. The Sign Test Summary provides an overall summary of design input (Table 1) and resulting calculated values used to determine the required number (N) of direct measurements (per LTP Section 5.4.2). The Sign Test Summary is a separate statistical analysis that also calculates the mean, median, and standard deviation of the direct measurements.
("power")
The critical value and the result of the Sign Test are provided in the Sign Test Summary table, as well as a listing of the key release criteria. The direct measurements clearly pass the Sign Test. As discussed in Section E, the subject release criteria have been satisfied.
of meeting the release criteria.
In addition, the sample standard deviation is smaller than the design sigma; therefore, no additional samples were required.
Thus, it can be concluded that the direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.G. CHANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON EXTENT OF RESIDUAL ACTIVITY The survey was designed as a Class 1 land survey area; the FSS results were consistent with that classification.
: 2. The Quantile Plot was generated from the unity data listed in Table 2. The data set and plot are consistent with expectations for a Class I survey unit. All of the measurements are below the DCGL of 2.39 pCi/g for Cs-137.
The direct measurement sample standard deviation was less than the design sigma. Thus, a sufficient number of sample measurements were taken and no additional measurements were required.H. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 3 was performed and evaluated in the March 2005 time frame. The design was performed to the criteria of the LTP Revision 3 (References 2 and 4). No subsequent LTP changes with potential impact to this survey unit need to be evaluated.
2   See Attachment E to Maine Yankee Procedure PMP 6.7.8 (Reference 5).
I. CONCLUSION The FSS of this survey unit was designed based on the LTP designation as a Class I area.The survey design parameters are presented in Table 1. The required number of direct measurements was determined for the Sign Test in accordance with the LTP. As presented in Table 2, all direct measurements were less than the DCGL of 2.39 pCi/g Cs-137. There were no investigations.
FR-0200-03, Revision 0 Page 5 of 20
A Sign Test Summary analysis demonstrated that the Sign Test criteria were satisfied.
: 3. A Histogram Plot wvas also developed. This plot shows a log-normal distribution with one outlier.
The direct measurement sigma was determined to be less than that used for design, thus indicating that a sufficient number of samples was taken.The Retrospective Power Curve shown in Attachment 4 confirmed that sufficient samples were taken to support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and the data quality objectives were met. Attachment 4 also revealed that direct measurement data represented essentially a log-normal distribution with one outlier.The scan survey design for this survey unit was developed in accordance with the LTP Revision 3 Addenda (References 2 and 4) with significant aspects of the design discussed in Section B and Table1. ISOCS scans performed at a distance of 3 meters in a systematic grid pattern throughout the survey unit did not identify activity above the scan investigation levels of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. Therefore, no investigations were required as a result of the scan process.It is concluded that FR-0200 Survey Unit 3 meets the release criteria of IOCFR20.1402 and the State of Maine enhanced criteria.FR-0200-03, Revision 0 Page 6 of 20 J. REFERENCES
: 4. A Retrospective Power Curve was constructed, based on FSS results. The curve shows that this survey unit having a mean residual activity at a small fraction of the DCGL has a high probability ("power") of meeting the release criteria. Thus, it can be concluded that the direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.
: 1. Maine Yankee License Termination Plan, Revision 3, October 15, 2002 and Addenda provided by Maine Yankee letter to the NRC, MN-02-061, dated November 26, 2002 2. NRC letter to Maine Yankee, dated February 28,2003 3. Maine Yankee letter to the NRC, MN-03-049, dated September 11, 2003 (LTP Supplement to LTP Revision 3)4. Issuance of License Amendment No. 170, NRC letter to Maine Yankee, dated February 18, 2004 5. Maine Yankee PMP 6.7.8, FSS Data Processing and Reporting, Attachment E, Approach for Dealing With Background Radioactivity for Maine Yankee Final Status Surveys 6. Maine Yankee Calculation No. EC-003-04, Use of Canberra In Situ Object Counting System (ISOCS) for FSS Surveys 7. Maine Yankee LTP Change Number 05-00 1, Deep Soil Co-60 DCGL FR-0200-03, Revision 0 Page 7 of 20 Attachment 1 Survey Unit Maps FR-0200-03, Revision 0 Page 8 of 20 Co 0 0 A a 0 0 0 0 0%n 0 0 0 0 0 0 (A 0 a a 0 0 0 0 0 0 0 0 oo, a%O a aw 0 0 0 0 0 0 0 a 623, 000 E 623.500 E 624, 000 E 624, 500 E 625.000 E 625. 500 E 6Z6, 000 E C 0 1r-i O'p 0 0 0)CO 9D 0 Qt o)0 0)Co 0)c 0 2C:>0)CD Z 0 a)z 0)<0l)0.0)Q)m O7 C 0"C C 0 zo:2 t CD g CDR 8 3 2 (A 0.(O CD:3 CD a)CD (D z1 m M 00)0::5 0 0"lo m 13, R;O K fD a),0 0 m)SURVEY AREA, FRO200 SU's 3-9 Yard East Soils Note: Grid based on Maine State Coordinate System (West Zone) NAD 1927 9 MNN D- N llainp Yankee Decommissioning Team Maine Yankee Decommissioning Project Survey Forni IDate: 3/14/05 Survey Type: El Characterization El Turnover I Final Status Survey I Survey Area Name: RCA Yard East Soils Final Status Survey FRO200: RCA Yard East Soils Survey Units 3-9 Reference Map 7 I-4-J CD CD FRO200 SU6 I I I I I I I I4 U~-i//1i I FRO200 SUS I I I Ij I I C-Lzj ---FRO200 SU4/C 2 7 FRO200 Sg 2 I----J I-r -- --Lr/I//FRO200 SU9 I L I I I_ , I- --FROM2OO SU3 I 'z FR-0200-03, Revision 0 Page IOof20 Maine Yankee Map ID#: FRO200-3a Decommissioning Team Maine Yankee Decommissioning Project Survey Form Date: 2/21IO5 Survey Type: 0 Characterization 0 Turnover 1 Final Status Survey Survey Area Name: RCA Yard East Soils Final Status Survey FRO200 SU3: RCA YardEast Soils Survey Scans S001 -S090 2 40,n , -4.8rnt Typical ISOCS Spacing (Naxkniq FR-0200-03, Revision 0 Page I 1 of 20 Surface Area = 1687 sq-m Maine Yankee Map ID#: FRO200-3b Decommissioning Team MAfaine Yankee Decontmissioning Project Survey Form Date: 1/11105 Survey Type: 0 Characterization L Turnover 1 Final Status Survey Survey Area Name: RCA Yard East Soils Final Status Survey FRO200 SU3: RCA YardEast Soils Direct Points S001 -S042 407,343.2.
G. CHANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON EXTENT OF RESIDUAL ACTIVITY The survey was designed as a Class 1 land survey area; the FSS results were consistent with that classification. The direct measurement sample standard deviation was less than the design sigma. Thus, a sufficient number of sample measurements were taken and no additional measurements were required.
HMN A D,4 -FR-0200-03, Revision 0 Page 12 of 20;urface Area = 1687 sq-m N=40 L=
H. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 3 was performed and evaluated in the March 2005 time frame. The design was performed to the criteria of the LTP Revision 3 (References 2 and 4). No subsequent LTP changes with potential impact to this survey unit need to be evaluated.
Attachment 2 Survey Unit Instrumentation FR-0200-03, Revision 0 Page 13 of 20 TABLE 2-1 INSTRUMENT INFORMATION ISOCS Detectors (Field Measurements)
I. CONCLUSION The FSS of this survey unit was designed based on the LTP designation as a Class I area.
Detector No. MDC (pCi/g)7605 0.11 to 0.30 7607 0.10 to 0.34 7780 0.1 Oto 0.31 HPGe Detectors (Laboratory Analysis)Detector No. MDC (pCi/g)FSS1 0.04 to 0.08 FSS2 0.04 to 0.09 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DCGLENIC Parameter Instrument:
The survey design parameters are presented in Table 1. The required number of direct measurements was determined for the Sign Test in accordance with the LTP. As presented in Table 2, all direct measurements were less than the DCGL of 2.39 pCi/g Cs-137. There were no investigations.
ISOCS Comments Scan MDC 0.10 to 0.34 pCi/g -25% DCGL 2.3 9 pCi/g Cs-i1 3 7 Approved DCGL for land DCGL 0.86 pCi/g Co 60 areas inside the Restricted Area, (References 4 and 7)Investigation Level 1.0 pCi/g Cs- 137 (ISOCS @ 3 m) 0.36 pCi/g Co-60 (Reference 6)DCGL x Area Factor for Design DCGLEMC 3.8 pCi/g Cs-137 Class I survey unit, per LTP 1.4 pilg o-60Section 5.6.3 FR-0200-03, Revision 0 Page 14 of 20 Attachment 3 Investigation Table (There were no Investigations)
A Sign Test Summary analysis demonstrated that the Sign Test criteria were satisfied. The direct measurement sigma was determined to be less than that used for design, thus indicating that a sufficient number of samples was taken.
FR-0200-03, Revision 0 Page 15 of 20 Attachment 4 Statistical Data FR-0200-03, Revision 0 Page 16 of 20 Survey Package FRO200 Unit 3 CS-137 Soil Sign Test Summary-."-'Eva uation __nput__Iues__
The Retrospective Power Curve shown in Attachment 4 confirmed that sufficient samples were taken to support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and the data quality objectives were met. Attachment 4 also revealed that direct measurement data represented essentially a log-normal distribution with one outlier.
ornm 'en-ints-I-Survey Package: FR0200 Survey Unit: 03 Evaluator:
The scan survey design for this survey unit was developed in accordance with the LTP Revision 3 Addenda (References 2 and 4) with significant aspects of the design discussed in Section B and Table1. ISOCS scans performed at a distance of 3 meters in a systematic grid pattern throughout the survey unit did not identify activity above the scan investigation levels of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. Therefore, no investigations were required as a result of the scan process.
Andy Olsen DCGL,: 2.39E+00 Cs-137 DCGLe,: 3.76E+00 AF = 1.6 LBGR: 1.20E+00 50% of DCGL Sigma: 1.33E+00 LTP Rev 3, Table 5-1 C Type I error: 0.05 Type II error: 0.05 Nuclide: CS-137 Soil Type: N/A No material background is applied.~ V Itc-T --r~nmhts<:-
It is concluded that FR-0200 Survey Unit 3 meets the release criteria of IOCFR20.1402 and the State of Maine enhanced criteria.
% 1.645 1.645 Sign p: 0.788145 Calculated Relative Shift: 0.8 Relative Shift Used: 0.8 Uses 3.0 if Relative Shift is >3 N-Value: 33 N-Value+20%:
FR-0200-03, Revision 0 Page 6 of 20
40 ,, ,>, > .S .' Samnplo Daa Value tz,,>S~ rnment t Number of Samples: 42 Median: 4.92E-02 Mean: : 5.12E-02 Net Sample Standard Deviation:
 
1.30E-02 Total Standard Deviation:
J. REFERENCES
1.30E-02 Sum of samples and reference Maximum: 1.15E-01 Wgn Test esu on Adjusted N Value: 42 S+ Value: 42 Critical Value: 26 Sign test results:, Pass Sufficient samples collected:
: 1. Maine Yankee License Termination Plan, Revision 3, October 15, 2002 and Addenda provided by Maine Yankee letter to the NRC, MN-02-061, dated November 26, 2002
Pass Maximum value <DCGL,: Pass Median value <DCGLw: " Pass Mean value <DCGLW: Pass Maximum value <DCGLenc:
: 2. NRC letter to Maine Yankee, dated February 28,2003
Pass Total Standard Deviation  
: 3. Maine Yankee letter to the NRC, MN-03-049, dated September 11, 2003 (LTP Supplement to LTP Revision 3)
<=Sigma: Pass Criteria comparison results: -Pass_________________
: 4. Issuance of License Amendment No. 170, NRC letter to Maine Yankee, dated February 18, 2004
survey___
: 5. Maine Yankee PMP 6.7.8, FSS Data Processing and Reporting, Attachment E, Approach for Dealing With Background Radioactivity for Maine Yankee Final Status Surveys
u passes_______orn Peas The survey unit passes all conditions
: 6. Maine Yankee Calculation No. EC-003-04, Use of Canberra In Situ Object Counting System (ISOCS) for FSS Surveys
_______________Pass____
: 7. Maine Yankee LTP Change Number 05-00 1, Deep Soil Co-60 DCGL FR-0200-03, Revision 0 Page 7 of 20
FR-0200-03, Revision 0 Page 17 of 20 FRO200 SU-3 Quantile Plot 0.14 0.12 0 00'c o t.j <.o x'AD 50 0.Q._._0.1 0.08 0.06 0.04-I". ...... , ..,* * + 19, , 4*o 6* Activity (pCi/g)-Median (pCi/g)I 0.02 0-I 0 25 50 75 100 Percent One-Sample T-Test Report Page/Date/Time 2 3/22/05 4:02:03 PM Database Variable C2 Plots Section Histogram of FR-0200, SU-3 25, In 0.E tu U)-0 z 19 13 6._ ...-................0 020 0.045 0.070 0.095 Activity (pCilg)0.120 FR-0200-03, Revision 0 Page 19 of 20  
 
-I One-Sample T-Test Power Analysis Page/Date/Time 2 3/31/05 10:04:16 AM Chart Section Retrospective Power Curve 1.0 _ ..-0.8- .. -.- *.-a3 0.6- .------..-..
Attachment 1 Survey Unit Maps FR-0200-03, Revision 0 Page 8 of 20
0 0.4- .-. .------------
 
0.2-0.0 I 0.0 0.5 1.0 1.5 2.0 2.5 Survey Unit Mean (pCi/g)FR-0200-03, Revision 0 Page 20 of 20}}
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llainp Yankee Decommissioning Team            Maine Yankee DecommissioningProjectSurvey Forni IDate:                  3/14/05 Survey Type:   El Characterization  El Turnover I Final Status Survey I Survey Area Name: RCA Yard East Soils Final Status Survey FRO200: RCA Yard East Soils Survey Units 3-9 Reference Map 7
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FR-0200-03, Revision 0 Page IOof20
 
Maine Yankee                                                                              Map ID#: FRO200-3a Decommissioning Team            Maine Yankee DecommissioningProjectSurvey Form Date:              2/21IO5 Survey Type: 0 Characterization    0 Turnover 1 Final Status Survey Survey Area Name: RCA Yard East Soils Final Status Survey FRO200 SU3: RCA YardEast Soils Survey Scans S001 - S090 2 40,n,         -
4.8rnt Typical ISOCS Spacing (Naxkniq FR-0200-03, Revision 0 Page I1 of 20 Surface Area = 1687 sq-m
 
Maine Yankee                                                                           Map ID#: FRO200-3b Decommissioning Team         MAfaine Yankee DecontmissioningProjectSurvey Form             Date: 1/11105 Survey Type: 0 Characterization L Turnover 1 Final Status Survey Survey Area Name: RCA Yard East Soils Final Status Survey FRO200 SU3: RCA YardEast Soils Direct Points S001 - S042 407,343.2.
HMN A  D,4
                                                                                        -
FR-0200-03, Revision 0 Page 12 of 20
;urface Area = 1687 sq-m             N=40      L=
 
Attachment 2 Survey Unit Instrumentation FR-0200-03, Revision 0 Page 13 of 20
 
TABLE 2-1 INSTRUMENT INFORMATION ISOCS Detectors (Field Measurements)
Detector No.                   MDC (pCi/g) 7605                        0.11 to 0.30 7607                        0.10 to 0.34 7780                        0.1Oto 0.31 HPGe Detectors (Laboratory Analysis)
Detector No.                   MDC (pCi/g)
FSS1                        0.04 to 0.08 FSS2                         0.04 to 0.09 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DCGLENIC Parameter               Instrument: ISOCS                         Comments Scan MDC                   0.10 to 0.34 pCi/g           - 25% DCGL 2.3 9 pCi/g Cs-i1 3 7         Approved DCGL for land DCGL                     0.86 pCi/g Co 60             areas inside the Restricted Area, (References 4 and 7)
Investigation Level             1.0 pCi/g Cs- 137 (ISOCS @ 3 m)                 0.36 pCi/g Co-60             (Reference 6)
DCGL x Area Factor for Design DCGLEMC                 3.8 pCi/g Cs-137             Class I survey unit, per LTP 1.4 pilg o-60Section           5.6.3 FR-0200-03, Revision 0 Page 14 of 20
 
Attachment 3 Investigation Table (There were no Investigations)
FR-0200-03, Revision 0 Page 15 of 20
 
Attachment 4 Statistical Data FR-0200-03, Revision 0 Page 16 of 20
 
Survey Package FRO200 Unit 3 CS-137 Soil Sign Test Summary uation
              -."-'Eva                     __nput__Iues__             'en-ints-I- ornm Survey Package:                 FR0200 Survey Unit:                     03 Evaluator:         Andy Olsen DCGL,:             2.39E+00 Cs-137 DCGLe,:               3.76E+00 AF = 1.6 LBGR:             1.20E+00 50% of DCGL Sigma:             1.33E+00 LTP Rev 3, Table 5-1 C Type I error:                   0.05 Type II error:                 0.05 Nuclide:               CS-137 Soil Type:                   N/A No material background is applied.
                                ~ V Itc-T                                       -- r~nmhts<:-
                                                    % 1.645 1.645 Sign p:           0.788145 Calculated Relative Shift:                   0.8 Relative Shift Used:                   0.8 Uses 3.0 if Relative Shift is >3 N-Value:                     33 N-Value+20%:                       40
  ,, >,>,.S .'     Samnplo Daa Value                         tz,,>S~               rnment       t Number of Samples:                       42 Median:             4.92E-02 Mean: :           5.12E-02 Net Sample Standard Deviation:                 1.30E-02 Total Standard Deviation:               1.30E-02 Sum of samples and reference Maximum:               1.15E-01 Wgn                       Test esu                                                       on Adjusted N Value:                     42 S+ Value:                     42 Critical Value:                   26 Sign test results:,               Pass Sufficient samples collected:                   Pass Maximum value <DCGL,:                       Pass Median value <DCGLw: "                   Pass Mean value <DCGLW:                     Pass Maximum value <DCGLenc:                       Pass Total Standard Deviation <=Sigma:                     Pass Criteria comparison results:         -         Pass
_________________survey___u passes_______orn                                           Peas The survey unit passes all conditions                             _______________Pass____
FR-0200-03, Revision 0 Page 17 of 20
 
FRO200 SU-3 Quantile Plot 0.14 0.12 0.1 0  0.
0.08 -I
* Activity (pCi/g) co 00' o
t.j x
    <.
    'AD Q
        ._
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                  ....  , . .,* * + 19, , 6 4*o 0.04 0.02 -I 0
0    25                50      75      100 Percent
 
One-Sample T-Test Report Page/Date/Time       2     3/22/05 4:02:03 PM Database Variable             C2 Plots Section Histogram of FR-0200, SU-3 25, In
: 0. 19 E
tu 13
-0 U) z     6 0 020
          . . - .. .Activity 0.045          .. .. .. ...
                      . . . .(pCilg) 0.070     0.095
                                          . _ .
0.120 FR-0200-03, Revision 0 Page 19 of 20
 
                                                                            -I One-Sample T-Test Power Analysis Page/Date/Time   2 3/31/05 10:04:16 AM Chart Section Retrospective Power Curve 1.0   _ .   .-
0.8-             ..   -.-     *.-
a3 0.6-           . ------..-..
0 0.4-       .-.     .------------
0.2-0.0                                 I 0.0     0.5             1.0   1.5         2.0       2.5 Survey Unit Mean (pCi/g)
FR-0200-03, Revision 0 Page 20 of 20}}

Revision as of 01:29, 24 November 2019

Final Status Survey Release Record FR-0200 Yard East Survey Unit 3
ML051050099
Person / Time
Site: Maine Yankee
Issue date: 04/04/2005
From: Ambrose J, Olsen C, Packer J, Pillsbury G, Tozzie R
Maine Yankee Atomic Power Co
To:
NRC/FSME
References
FR-0200-03, Rev 0
Download: ML051050099 (20)
v • d • e


Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0200 YARD EAST SURVEY UNIT 3 Prepared By: __ Date: sJar:,.P SEnginrSignature Printed Name Reviewed By: Date: 33 o0w HS fiQgnAnature Printed Name Reviewed By: W e? G v Date: 3 ° 0si~

Independent Review nature

//7Printed arne Approved By: Date: _____

PSSnted -Signature Printed Name Revision 0

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0200 YARD EAST SURVEY UNIT 3 A. SURVEY UNIT DESCRIPTION FR-0200 Yard East Survey Unit 3 was located in the SE corner of the site, residing in the former "Industrial Area" yard. The 1687 m2 area was bordered on the north by FR-0200 Survey Units 9 and 4 and on the west by FR-01 11 Survey Unit 17. Survey Unit 3 is bounded by FR-0200 Survey Unit I to the South and East. The survey unit is located within the current Restricted Area (RA) and includes a 4 meter wide buffer zone outside the RA. This survey unit is contained within the triangular coordinates 623965E, 407343N; 623992E, 407469N; and 624228E, 407418N using the Maine State Coordinate System (West Zone)

NAD 1927. The location of the survey unit in relation to the Turbine Building and the proximate FR-0200 survey units is shown on map FR0200 REF (Attachment 1).

Survey Unit 3 is an area composed primarily of soil and backfill, and is relatively flat.

B. SURVEY UNIT DESIGN INFORMATION Survey Area FR-0200 was originally designed as a Class 3 area per LTP Revision 3. During decommissioning, the RA boundary was expanded to include a portion of FR-0200 including Survey Unit 3. Thus, Survey Unit 3 was reclassified to Class 1. Survey Unit 3 met the LTP Revision 3 definition for a Class I survey unit. The survey unit design parameters are shown in Table 1. Given a relative shift of 0.8, it was determined that 40 direct measurements were required for the Sign Test. (It was later realized that a higher DCGL for areas with only surface soil contamination could have been used, resulting in a requirement for only 18 direct measurements.) Because the measurement locations were based on a systematic square grid with a random start point, the N=40 design led to a survey unit map with 42 locations which are illustrated on map FR0200-3b (Attachment 1). Direct measurements (soil samples) were collected from required locations and analyzed with laboratory gamma spectroscopy instrumentation.

In accordance with the LTP, scans covering 100% of the 1687 m2 area were required for the Class I survey unit. This was accomplished by use of an in situ gamma spectroscopy detector (ISOCS) configured at a 3-meter distance from the surface to obtain overlapping 28-m2 fields of view. The ISOCS detector was positioned perpendicular to the surface.

Locations of the 90 survey scans are shown on map FRO200-3a (Attachment 1).

The ISOCS scans were configured to ensure 100% scan coverage of all exposed surfaces within Survey Unit 3. The survey instruments used are listed by model and serial number in Attachment 2 (Table 2-1). Scan MDCs are also listed in Attachment 2 (Table 2-2) and are compared to the DCGL, the investigation level, and the DCGLEMC. The scan MDC is less than the scan investigation level, thus providing high confidence (95% or higher) that an elevated area would be detected in the scanning process. Further, since the investigation level was always less than the design DCGLEMC, no EMC sample size adjustment was necessary.

FR-0200-03, Revision 0 Page 2 of 20

TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit j Design Criteria l Basis Area 1687 m2 Class 1, < 2,000 m2 Based on an LBGR of 1.2 Number of Direct 40 pCi/g, sigmal of 1.33 pCi/g and Measurements Required a relative shift of 0.8.

2_ 1 Type = Type 11 = 0.05 Sample Area 42 m2 1687 m /40 = 42 m Sample Grid Spacing 6.5 m (42)1/2 Scan Grid Area ISOCS scan at 3 meters See Section B Area Factor 1.6 Class I Area, LTP Table 6-12 Scan Area 1687 m2 Class I Area - 100%

Background 2>K§ _7, 77'1?'-i -

SPA-3 (scan)

..10 pCi/g Cs-137 ISOCS investigation levels with Scan Investigation Level 0.36 pCi/g Co-60 detector at 3-meter height 0.36 o-60(Reference

~ifg 6)

DCGL 2.39 pCi/g Cs-137 (References 4 and 7)

_____

_____ _____ _____ 0.86 pC i/g C o-60_ _ _ _ _ _ _ _ _ _ _ _ _

3DCGL x Area Factor for Class Design DCGLENMc 3.8 pCi/g Cs-137 1 survey unit, per LTP Section 5.6.3 C. SURVEY RESULTS A total of 42 direct measurements were performed in Survey Unit 3. One sample contained Cs-1 37 with levels of residual activity greater than the MDA but below the DCGL. No samples contained detectable Co-60 activity. All other measurements were below the MDA.

The results are presented in Table 2. No investigations were necessary or performed based on the direct measurement results.

ISOCS gamma scans were performed at 90 locations using an investigation level of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. The gamma scans were performed for a sufficient count time to achieve a Minimum Detectable Activity (MDA) of approximately 25% of the DCGL. All identified scan activity levels and MDAs were below the investigation levels. Therefore, no investigation surveys were performed as a result of the scan surveys.

LTP Revision 3, Table 5-IC for RCA Yard West, R0100 FR-0200-03, Revision 0 Page 3 of 20

TABLE 2 DIRECT MEASUREMENTS Sample Number Cs-137 (pCi/g) Uncertainty (pCi/g)

FRO20003ISOOI < 5.97E-02 FR020003 1S002 < 3.53E-02 FR020003 I S003 < 4.36E-02 FR0200031S004 < 4.99E-02 FR0200031S005 < 4.76E-02 FR0200031S006 < 4.15E-02 FR0200031S007 < 4.66E-02_

FR0200031S008 < 5.63E-02 FR0200031S009 < 3.62E-02 FRO200031SO10 1.15E-01 3.82E-02 FRO200031SOII < 5.35E-02 FR0200031S012 < 5.40E-02 FR0200031S013 < 4.94E-02 FR0200031S014 < 4.42E-02 FR0200031S015 < 5.32E-02 FR0200031S016 < 4.89E-02 FR020003 1S017 < 3.84E-02 FR0200031S018 < 4.18E-02 FR0200031SO19 < 4.96E-02 FR020003 1S020 < 4.59E-02 FR020003 1S021 < 5.05E-02 FR0200031S022 < 5.15E-02 FR020003 1S023 < 5.55E-02 FR020003 1S024 < 4.441E-02 FR020003 1S025 < 3.84E-02 FR020003 1S026 < 3.89E-02 FR020003 I S027 < 4.23E-02 .

FR020003 1S028 < 4.84E-02 FR020003 1S029 < 4.53E-02 FR0200031S030 < 5.68E-02 FRO200031S031 < 5.49E-02 FRO200031S032 < 4.41E-02 FR0200031S033 < 4.74E-02 FR0200031S034 < 5.88E-02 FR0200031S035 < 6.70E-02 FR0200031S036 < 6.03E-02 FR0200031S037 < 6.51E-02 FR0200031S038 < 5.42E-02 FR0200031S039 < 4.1OE-02 FR0200031S040 < 5.67E-02 FR0200031S041 < 4.55E-02 FR020003 I S042 < 7.24E-02 Mean 5.12E-02 Median 4.92E-02 Standard Deviation 131E-02 Range 3.53E-02 to 1.15E-O1

"<" indicates MDA value. Bold indicates positive detection value.

No Co-60 detected above an MDA of 0.1 pCi/g.

FR-0200-03, Revision 0 Page 4 of 20

D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS Based on the scan results, no investigations were required.

E. SURVEY UNIT DATA ASSESSMENT An analysis of the direct sample measurement results, including the mean, median, standard deviation, and sample result range, is provided in Table 2. Positively detected values are bolded in the table. Ofthe 42 soil samples collected, one identified Cs-137 activity below the DCGL value of 2.39 pCi/g and no samples identified Co-60 activity. All other values were below the MDA. Identified sample activities or Minimum Detectable Activities are listed in Table 2. The mean and median activities were less than the DCGL for Cs-137. The average of the Cs-1 37 measurements was 0.051 pCi/g, indicating that the direct measurements averaged 2.1% of the DCGL limit.

For illustrative purposes, as indicated in LTP Section 5.9.3, a simplified general retrospective dose estimate can be calculated from the average residual contamination level by subtracting the mean fallout Cs-137 value (0.19 pCi/g) 2 for disturbed soil from the survey unit sample mean activity (0.051 pCi/g). This would equate to an annual dose rate of 0.0 mrem/year.

Also, for purposes of demonstrating compliance with the radiological criteria for license termination and the enhanced State of Maine criteria, background activity was not subtracted from the sample analysis activity values.

F. ADDITIONAL DATA EVALUATION Attachment 4 provides additional data evaluation associated with this Survey Unit, including relevant statistical information. Based on survey unit direct measurement data, this attachment provides the Sign Test Summary, Quantile Plot, Histogram, and Retrospective Power Curve.

I. The Sign Test Summary provides an overall summary of design input (Table 1) and resulting calculated values used to determine the required number (N) of direct measurements (per LTP Section 5.4.2). The Sign Test Summary is a separate statistical analysis that also calculates the mean, median, and standard deviation of the direct measurements.

The critical value and the result of the Sign Test are provided in the Sign Test Summary table, as well as a listing of the key release criteria. The direct measurements clearly pass the Sign Test. As discussed in Section E, the subject release criteria have been satisfied.

In addition, the sample standard deviation is smaller than the design sigma; therefore, no additional samples were required.

2. The Quantile Plot was generated from the unity data listed in Table 2. The data set and plot are consistent with expectations for a Class I survey unit. All of the measurements are below the DCGL of 2.39 pCi/g for Cs-137.

2 See Attachment E to Maine Yankee Procedure PMP 6.7.8 (Reference 5).

FR-0200-03, Revision 0 Page 5 of 20

3. A Histogram Plot wvas also developed. This plot shows a log-normal distribution with one outlier.
4. A Retrospective Power Curve was constructed, based on FSS results. The curve shows that this survey unit having a mean residual activity at a small fraction of the DCGL has a high probability ("power") of meeting the release criteria. Thus, it can be concluded that the direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.

G. CHANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON EXTENT OF RESIDUAL ACTIVITY The survey was designed as a Class 1 land survey area; the FSS results were consistent with that classification. The direct measurement sample standard deviation was less than the design sigma. Thus, a sufficient number of sample measurements were taken and no additional measurements were required.

H. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 3 was performed and evaluated in the March 2005 time frame. The design was performed to the criteria of the LTP Revision 3 (References 2 and 4). No subsequent LTP changes with potential impact to this survey unit need to be evaluated.

I. CONCLUSION The FSS of this survey unit was designed based on the LTP designation as a Class I area.

The survey design parameters are presented in Table 1. The required number of direct measurements was determined for the Sign Test in accordance with the LTP. As presented in Table 2, all direct measurements were less than the DCGL of 2.39 pCi/g Cs-137. There were no investigations.

A Sign Test Summary analysis demonstrated that the Sign Test criteria were satisfied. The direct measurement sigma was determined to be less than that used for design, thus indicating that a sufficient number of samples was taken.

The Retrospective Power Curve shown in Attachment 4 confirmed that sufficient samples were taken to support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and the data quality objectives were met. Attachment 4 also revealed that direct measurement data represented essentially a log-normal distribution with one outlier.

The scan survey design for this survey unit was developed in accordance with the LTP Revision 3 Addenda (References 2 and 4) with significant aspects of the design discussed in Section B and Table1. ISOCS scans performed at a distance of 3 meters in a systematic grid pattern throughout the survey unit did not identify activity above the scan investigation levels of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. Therefore, no investigations were required as a result of the scan process.

It is concluded that FR-0200 Survey Unit 3 meets the release criteria of IOCFR20.1402 and the State of Maine enhanced criteria.

FR-0200-03, Revision 0 Page 6 of 20

J. REFERENCES

1. Maine Yankee License Termination Plan, Revision 3, October 15, 2002 and Addenda provided by Maine Yankee letter to the NRC, MN-02-061, dated November 26, 2002
2. NRC letter to Maine Yankee, dated February 28,2003
3. Maine Yankee letter to the NRC, MN-03-049, dated September 11, 2003 (LTP Supplement to LTP Revision 3)
4. Issuance of License Amendment No. 170, NRC letter to Maine Yankee, dated February 18, 2004
5. Maine Yankee PMP 6.7.8, FSS Data Processing and Reporting, Attachment E, Approach for Dealing With Background Radioactivity for Maine Yankee Final Status Surveys
6. Maine Yankee Calculation No. EC-003-04, Use of Canberra In Situ Object Counting System (ISOCS) for FSS Surveys
7. Maine Yankee LTP Change Number 05-00 1, Deep Soil Co-60 DCGL FR-0200-03, Revision 0 Page 7 of 20

Attachment 1 Survey Unit Maps FR-0200-03, Revision 0 Page 8 of 20

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llainp Yankee Decommissioning Team Maine Yankee DecommissioningProjectSurvey Forni IDate: 3/14/05 Survey Type: El Characterization El Turnover I Final Status Survey I Survey Area Name: RCA Yard East Soils Final Status Survey FRO200: RCA Yard East Soils Survey Units 3-9 Reference Map 7

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FR-0200-03, Revision 0 Page IOof20

Maine Yankee Map ID#: FRO200-3a Decommissioning Team Maine Yankee DecommissioningProjectSurvey Form Date: 2/21IO5 Survey Type: 0 Characterization 0 Turnover 1 Final Status Survey Survey Area Name: RCA Yard East Soils Final Status Survey FRO200 SU3: RCA YardEast Soils Survey Scans S001 - S090 2 40,n, -

4.8rnt Typical ISOCS Spacing (Naxkniq FR-0200-03, Revision 0 Page I1 of 20 Surface Area = 1687 sq-m

Maine Yankee Map ID#: FRO200-3b Decommissioning Team MAfaine Yankee DecontmissioningProjectSurvey Form Date: 1/11105 Survey Type: 0 Characterization L Turnover 1 Final Status Survey Survey Area Name: RCA Yard East Soils Final Status Survey FRO200 SU3: RCA YardEast Soils Direct Points S001 - S042 407,343.2.

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FR-0200-03, Revision 0 Page 12 of 20

urface Area = 1687 sq-m N=40 L=

Attachment 2 Survey Unit Instrumentation FR-0200-03, Revision 0 Page 13 of 20

TABLE 2-1 INSTRUMENT INFORMATION ISOCS Detectors (Field Measurements)

Detector No. MDC (pCi/g) 7605 0.11 to 0.30 7607 0.10 to 0.34 7780 0.1Oto 0.31 HPGe Detectors (Laboratory Analysis)

Detector No. MDC (pCi/g)

FSS1 0.04 to 0.08 FSS2 0.04 to 0.09 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DCGLENIC Parameter Instrument: ISOCS Comments Scan MDC 0.10 to 0.34 pCi/g - 25% DCGL 2.3 9 pCi/g Cs-i1 3 7 Approved DCGL for land DCGL 0.86 pCi/g Co 60 areas inside the Restricted Area, (References 4 and 7)

Investigation Level 1.0 pCi/g Cs- 137 (ISOCS @ 3 m) 0.36 pCi/g Co-60 (Reference 6)

DCGL x Area Factor for Design DCGLEMC 3.8 pCi/g Cs-137 Class I survey unit, per LTP 1.4 pilg o-60Section 5.6.3 FR-0200-03, Revision 0 Page 14 of 20

Attachment 3 Investigation Table (There were no Investigations)

FR-0200-03, Revision 0 Page 15 of 20

Attachment 4 Statistical Data FR-0200-03, Revision 0 Page 16 of 20

Survey Package FRO200 Unit 3 CS-137 Soil Sign Test Summary uation

-."-'Eva __nput__Iues__ 'en-ints-I- ornm Survey Package: FR0200 Survey Unit: 03 Evaluator: Andy Olsen DCGL,: 2.39E+00 Cs-137 DCGLe,: 3.76E+00 AF = 1.6 LBGR: 1.20E+00 50% of DCGL Sigma: 1.33E+00 LTP Rev 3, Table 5-1 C Type I error: 0.05 Type II error: 0.05 Nuclide: CS-137 Soil Type: N/A No material background is applied.

~ V Itc-T -- r~nmhts<:-

% 1.645 1.645 Sign p: 0.788145 Calculated Relative Shift: 0.8 Relative Shift Used: 0.8 Uses 3.0 if Relative Shift is >3 N-Value: 33 N-Value+20%: 40

,, >,>,.S .' Samnplo Daa Value tz,,>S~ rnment t Number of Samples: 42 Median: 4.92E-02 Mean: : 5.12E-02 Net Sample Standard Deviation: 1.30E-02 Total Standard Deviation: 1.30E-02 Sum of samples and reference Maximum: 1.15E-01 Wgn Test esu on Adjusted N Value: 42 S+ Value: 42 Critical Value: 26 Sign test results:, Pass Sufficient samples collected: Pass Maximum value <DCGL,: Pass Median value <DCGLw: " Pass Mean value <DCGLW: Pass Maximum value <DCGLenc: Pass Total Standard Deviation <=Sigma: Pass Criteria comparison results: - Pass

_________________survey___u passes_______orn Peas The survey unit passes all conditions _______________Pass____

FR-0200-03, Revision 0 Page 17 of 20

FRO200 SU-3 Quantile Plot 0.14 0.12 0.1 0 0.

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One-Sample T-Test Report Page/Date/Time 2 3/22/05 4:02:03 PM Database Variable C2 Plots Section Histogram of FR-0200, SU-3 25, In

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. . . .(pCilg) 0.070 0.095

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0.120 FR-0200-03, Revision 0 Page 19 of 20

-I One-Sample T-Test Power Analysis Page/Date/Time 2 3/31/05 10:04:16 AM Chart Section Retrospective Power Curve 1.0 _ . .-

0.8- .. -.- *.-

a3 0.6- . ------..-..

0 0.4- .-. .------------

0.2-0.0 I 0.0 0.5 1.0 1.5 2.0 2.5 Survey Unit Mean (pCi/g)

FR-0200-03, Revision 0 Page 20 of 20

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