ML051050077

Final Status Survey Release Record FR-0111 Yard West Excavations Survey Unit 12

ML051050077
Person / Time
Site:	Maine Yankee
Issue date:	04/07/2005
From:	Ambrose J, Dockins L, Packer J, Pillsbury G, Randall D Maine Yankee Atomic Power Co
To:	NRC/FSME
References
FR-0111-12, Rev 0
Download: ML051050077 (23)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0111 YARD WEST EXCAVATIONS SURVEY UNIT 12 Prepared By: 59 L L Date: a -2T.?I-0Y FSS Engineer- Signature Dg/-e &-&, ffz Printed Name Reviewed By: TSY Date: 3'>" 10 5 FS" ecialist - Signature Printed Name Reviewed By: c -%' Date: 33 3 -0 Independent Review - Signature fnPic ePirs Approved By: § ¶O Sintr Date:

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MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0111 YARD WEST EXCAVATIONS SURVEY UNIT 12 A. SURVEY UNIT DESCRIPTION FR-0 III Yard West Excavations Survey Unit 12 was located northwest of the former Containment Building. The 1,550-rn 2 area was bordered to the south by the excavation made to remove the spent fuel pool liner (Survey Area FA-0400). The survey unit was located near coordinates 407,800 N and 623,800 E using Maine State Coordinate System (West Zone) NAD 1927. The location of the survey unit in relation to the Containment Building and the surrounding FR-0 11 survey units is shown on map FROI I IU12-SITE (Attachment 1). Additional survey unit details, including topography, are shown on map FROI I IU12-INFO.

B. SURVEY UNIT DESIGN INFORMATION Survey Unit 12 met the LTP Revision 4 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. The measurement locations were based on a systematic square grid with a random start point as illustrated on map FROI I IU12-DIRT (Attachment 1). Direct measurements (soil, concrete, or ledge samples) were collected from required locations and analyzed with laboratory gamma spectroscopy instrumentation.

In accordance with the LTP, scans covering 100% of the 1,550 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-m 2 fields of view. The ISOCS detector was positioned perpendicular to the surface.

Locations of the 121 survey scans are shown on maps FROI I 1U12-3mSCAN and FROI IIU12-NONVERTSCAN. Three additional scans were performed in a soil undercut area beneath an existing duct bank. The measurement locations for these scans are shown on map FROI 1 IU12-UNDERCUTSCAN.

The ISOCS scans were configured to ensure 100% scan coverage of all exposed surfaces within Survey Unit 12. 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 DCGLENIC. 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 wvas always less than the design DCGLEMC, no EMC sample size adjustment was necessary.

FR-01 11-12, Revision 0 Page 2 of 23

TABLE I SURVEY UNIT DESIGN PARAMETERS Sureey Unit Design Criteria Basis Area 1,550 m2 Class 1, < 2,000 m2 Based on an LBGR of 1.2 pCifg, Number of Direct 40 sigma' of 1.33 pCi/g, and a relative Measurements Required shift of 0.8.

Type 1 = Type 11 = 0.05 Sample Area 38.75 m2 1,550 M2 / 40 = 38.75 M2 Sample Grid Spacing 6.2 m (38.75)X/

Scan Grid Area ISOCS scan at 3-meters See Section B Area Factor 1.6 Class I Area, LTP Table 6-12 Scan Area 1,550 m Class I Area - 100%

1.0 pCi/g Cs-137 ISOCS investigation levels with Scan Investigation Level 036 pCi/g Co-60 detector at 3-meter height or less 0.36 ~i/g o-60(Reference 3)

DCGL 2.39 pCifg Cs-137 Reference 1 0.86 pCi/g Co-60 ReferenceI

. 3.82 pCi/g Cs-137 DCGL x Area Factor for Class I Design DCGLEMc 1.38 pCi/g Co-60 survey unit, per LTP Section 5.6.3 C. SURVEY RESULTS A total of 40 direct measurements were performed in Survey Unit 12. Seven samples contained Cs-137 with levels of residual activity below the DCGL. Additionally, one of the samples with detectable Cs-137 also contained Co-60 below the unitized DCGL. All other measurements were below the MDA. The results are presented in Table 2.

ISOCS gamma scans were performed at 124 locations using an investigation level of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. At scan locations where the predominant media was concrete, the ISOCS geometries were modified, as appropriate. The gamma scans were performed for a sufficient count time to achieve a Minimum Detectable Activity (MDA) below the investigation levels. All identified scan activity levels were below the investigation levels. Therefore, no investigation surveys were performed as a result of the scan surveys.

LTP Revision 4, Table 5-IC for RCA Yard West, ROIOO FR-OI 11-12, Revision 0 Page 3 of 23

TABLE 2 DIRECT MEASUREMENTS Sample Number Cs-137 Uncert. Co-60 Uncert. Unitized Value of (pCi/g) (pCi/g) (pCilg) (pCi/g) Unity Rule FRO111112SOOI 1.36E-01 3.82E-02 < 7.44E-02 1.43E-01 FROIIIIOIS002 < 6.89E-02 < 8.70E-02 1.30E-Ol FROIII101SO03 < 7.36E-02 < 8.70E-02 1.32E-Ol FRO111101SO04 3.77E-01 4.56E-02 < 4.50E-02 2.1OE-OI FRO1IIIOISOO5 2.58E-01 4.24E-02 < 6.42E-02 1.83E-OI FROI I I OIl S006 < 4.51 E-02 < 4.56E-02 7.19E-02 FROI I I IOIS007 < 5.42E-02 < 5.33E-02 8.47E-02 FROIIIIOISO08 < 4.88E-02 < 5.14E-02 8.02E-02 FROIIIIOIS009 7.1IE-02 2.62E-02 < 6.12E-02 1.01E-01 FROIIIIOISOIO 9.84E-02 2.85E-02 < 6.12E-02 1.12E-01 FROIIIIOISOII 1.99E-01 3.52E-02 < 7.03E-02 1.65E-01 FRO I I I IOI SO12 < 5.43E-02 < 4.86E-02 7.92E-02 FRO I I IISOl1 3 < 1.14E-01 < 1.21E-01 1.88E-Ol FRO I I I IOI SO14 < 5.06E-02 < 5.57E-02 8.59E-02 FRO I I I IOI S015 < 4.58E-02 < 4.98E-02 7.71 E-02 FROI I I IOISO16 < 5.96E-02 < 5.13E-02 8.46E-02 FRO I I II S01SO12 < 5.69E-02 < 5.92E-02 9.26E-02 FROIlIIOISo18 < 4.35E-02 < 4.34E-02 6.87E-02 FROlIIIOISOl9 < 6.75E-02 < 7.15E-02 l1.IIE-Ol FRO I I I IOI S020 < 5.91 E-02 < 6.26E-02 9.75E-02 FROlIIIOIS021 < 5.12E-02 < 5.49E-02 _ 8.53E-02 FROIIIIOIS022 < 5.22E-02 < 5.26E-02 8.30E-02 FROIIIIOIS023 < 4.83E-02 < 4.69E-02 7.7E-02 FROIIIIOIS024 < 4.94E-02 < 5.15E-02 8.06E-02 FROIIIIOIS025 < 4.13E-02 < 4.42E-02 6.87E-02 FROIIIIO1S026 < 4.73E-02 < 5.71E-02 8.62E-02 FROIII101S027 2.74E-01 4.44E-02 1.80E-01 3.42E-02 3.24E-OI FROIIllOIS028 < 4.91E-02 < 5.79E-02 8.79E-02 FROI I I IOIS029 < 4.68E-02 < 5.22E-02 8.03E-02 FRO I IIIOIS030 < 4.35E-02 < 4.88E-02 7.49E-02 FRO I I I IOI S031 < 4.78E-02 < 5.15E-02 7.99E-02 FRO I I I 101S032 < 6.25E-02 < 5.89E-02 9.46E-02 FROIIIIO1 S033 < 4.02E-02 < 4.73E-02 7.18E-02 FRO I I I IO1S034 < 5.84E-02 < 5.42E-02 8.75E-02 FRO I I I IO1S035 < 4.21 E-02 < 4.49E-02 6.98E-02 FRO I I II01 S036 < 4.92E-02 < 4.86E-02 7.71 E-02 FRO I I I IO1S037 < 4.16E-02 < 5.24E-02 7.83E-02 FRO I I IO I S038 < 3.77E-02 < 4.16E-02 6.41 E-02 FRO I I OI S039 < 5.1OE-02 < 5.37E-02 8.38E-02 FROlIIIOIS040 < 4.97E-02 < 5.49E-02 8.46E-02 Mean 7.91E-02 6.05E-02 1.03E-0I Median 5.11 E-02 5.35E-02 8.46E-02 Standard Deviation 7.25E-02 2.44E-02 5.01 E-02 3.77E-02 to 4.16E-02 to 6.41E-02 to Range 3.77E-01 1.80E-01 3.24E-O1

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

FR-O1 11-12, Revision 0 Page 4 of 23

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. Since Co-60 and Cs-137 are the primary nuclides of concern, non-detect values for these nuclides were assumed to be present at the MDA. Of the 40 soil samples collected, 7 identified Cs-I 37 activity below the DCGL value of 2.39 pCi/g. Additionally, one of the samples with detectable Cs-1 37 also contained Co-60. 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 DCGLs for Cs-I 37 and Co-60.

The average of the DCGL unity fractions was 0. 103, indicating that the direct measurements averaged approximately 10% 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 (0.079 pCi/g). This would equate to an annual dose rate of 0.0 mrem/year.

Taking into account the average residual contamination level for Co-60, the annual dose rate would equate to 0.54 mrem/year 3 . For purposes of demonstrating compliance with the radiological criteria for license termination and the enhanced State criteria, background activity was not subtracted from the sample analysis activity values.

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

3 This annual dose equivalent is based on LTP Table 6-11 which shows the RA contaminated soil contribution (for soils contaminated at the DCGL) to be 7.67 mrem/y. Therefore, the annual dose rate would equate to (0.0605)

Annual Dose Rate = 7.67 x = 054 mrem l y 0.86 FR-01 11-12, Revision 0 Page 5 of 23

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.

1. 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 wvell as a listing of the key release criteria. The direct measurements clearly pass the sign test. In addition, all release criteria have been satisfied. 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 unitized DCGL for land inside the restricted area.

3. A Histogram Plot was also developed based on the unity data values. This plot shows a log-normal distribution.

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.

FR-O1 11-12, Revision 0 Page 6 of 23

11. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 12 was designed, performed, and evaluated in the March 2005 time frame. The design was performed to the criteria of the LTP Revision 4 (Reference 1). 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 DCGLs of 2.39 pCi/g Cs-] 37 and 0.86 pCi/g Co-60. No measurements exceeded the unitized DCGL.

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.

The scan survey design for this survey unit was developed in accordance with the LTP Revision 4 (Reference 1) with significant aspects of the design discussed in Section B and Table 1. ISOCS scans performed in a systematic grid pattern throughout the survey unit did not identify activity above the scan investigation levels of 1.0 pCi/g Cs-1 37 and 0.36 pCi/g Co-60. Therefore, no investigations were required as a result of the scan process.

It is concluded that FR-0 Il I Survey Unit 12 meets the release criteria of 10CFR20.1402 and the State of Maine enhanced criteria.

FR-01 11-12, Revision 0 Page 7 of 23

J. REFERENCES

1. Maine Yankee License Termination Plan, Revision 4, February 28, 2005, provided by Maine Yankee letter to the NRC, MN-05-010

2. Maine Yankee Procedure PMP 6.7.8, FSS Data Processing and Reporting, Attachment E, Approach for Dealing With Background Radioactivity for Maine Yankee Final Status Surveys

3. Maine Yankee Calculation No. EC-003-04, Use of Canberra In Situ Object Counting System (ISOCS) for FSS Surveys FR-01 11-12, Revision 0 Page 8 of 23

Attachment I Survey Unit Maps FR-OI 11-12, Revision 0 Page 9 of 23

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Attachment 2 Survey Unit Instrumentation FR-O1 11-12, Revision 0 Page 16 of 23

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

Detector No. l MDC (pCi/g) 7605 J 0.15 to 0.533 7780 0.138 to 0.41 7607 0.135 to 0.373 IIPGe Detectors (Laboratory Analysis)

Detector No. MDC (pCi/g)

FSSI 0.037 to 0.074 FSS2 0.037 to 0.070 DET2 0.069 to 0.087 DET3 0.114 to 0.121 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL AND DCGLEMC Parameter Instrument: ISOCS Comments Scan MDC 0.0135 to 0.533 pCi/g 2.3 9 pCi/g Cs- 13 7 Approved DCGL for land DCGL 086 pCi/g Co areas inside the Restricted Area (Reference 1)

Investigation Level 1.0 pCig Cs-]3 7 3)

(Reference 0.36 pCi/g Co-60(Rfrne3 3.82 pCi/g Cs- 3 7 DCGL x Area Factor for Design DCGLEAIC 1.38 pCi/g Co-60 Class I survey unit, per LTP 1.38 ~i/g o-60Section 5.6.3 FR-01 11-12, Revision 0 Page 17 of 23

Attachment 3 Investigation Table (not Used)

FR-OI 11-12, Revision 0 Page 18 of 23

Attachment 4 Statistical Data FR-O1 11-12, Revision 0 Page 19 of 23

Survey Package FR111 Unit 12 UNITY Soil Sign Test Summary

','Evldtation-. in~put Values bS A"'! i, 'tt- s-' <.1v;

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Survey Package: FR111 Survey Unit: 12 Evaluator: DR DCGLw: 1.OOE+00 Unity DCGLemc: 1.60E+00 LBGR: 5.OOE-01 Sigma: 5.56E-01 (1.33 pCi/g /2.39 pCi/g)

Type I error: 0.05 Type II error: 0.05 Nuclide: UNITY Soil Type: N/A

" .' ,>CMlcuiatedValues - . A,4,,'- -: ' ' *rmroents n ' -:

Zl,: 1.645 Z. :0: 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

.  ;; Samp. e Data .. , t ,;- Comments-Number of Samples: 40 Median: 8.46E-02 Mean: 1.03E-01 Net Sample Standard Deviation: 5.01 E-02 Total Standard Deviation: 5.01 E-02 SSRS Maximum: 3.24E-01 Adjusted N Value: 40 S+ Value: 40 Critical Value: 25 Sign test results: Pass

' .'. iCritera Satisfaclon.,, -. , - Comment -

Sufficient samples collected: Pass Maximum value <DCGLw: Pass Median value <DCGL,: Pass Mean value <DCGL,: Pass Maximum value <DCGL,,,: Pass Total Standard Deviation <=Sigma: Pass Criteria comparison results: Pass

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The survey unit passes all conditions:l Pass SU Passes FRI 11-SU12-SoilSign-UNITY 416/05 3:30 PM FR-O111-12, Revision 0 Page 20 of 23

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One-Sample T-Test Report Page/Date/Time 2 4/5/05 2:25:39 PM Database C:\Program Files\NCSS97\FR0111 SU-1 2.SO Variable C2 Plots Section Histogram of FR-01 11, SU-12 30 C) 23

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One-Sample T-Test Power Analysis Page/Date/Time 2 4/5/05 2:26:47 PM Chart Section Retrospective Power Curve 1 .0-*

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FR-O1 11-12, Revision 0 Page 23 of 23