ML051520396

Final Status Survey Release Record FR-0111 Yard West Excavations Survey Unit 20

ML051520396
Person / Time
Site:	Maine Yankee
Issue date:	05/24/2005
From:	Dockins L, Olsen C, Packer J, Pillsbury G, Randall D Maine Yankee Atomic Power Co
To:	NRC/FSME
References
FR-0111-20, Rev 0
Download: ML051520396 (23)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0111 YARD WEST EXCAVATIONS SURVEY UNIT 20 Prepared By: 4E.; 0-,& =rZ Date: 9-7q-O, S FSS Engineer - Signature De/ee Gus dall Printed Name Reviewed By: Date: 5-24 -C F6pecialist - Signature Printed Name Reviewed By: Date: 5I6 Inpdentenignature Printed Name Approved By: ___ _ _ Date: /4 /s vSentend<<F,% - Signature Printed Namne 7 Approved By: Date:

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MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0111 YARD WEST EXCAVATIONS SURVEY UNIT 20 A. SURVEY UNIT DESCRIPTION FR 0111 Yard West Excavations Survey Unit 20 was located north of the former Containment Building. The 1,300 m2 area was Northeast of FA 0400 Survey Unit 1, (the Fuel Building Footprint). The survey unit was centered near coordinates 407,750 N and 624,000 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 0111 survey units is shown on map FROI 11U20-SITE (Attachment 1).

The survey unit consisted of a relatively flat, rectangular, gravel area. There was a trench through the survey unit where a storm drain and catch basin were removed. The survey unit's general layout and topography are shown on map FROI 11 U20-INFO.

B. SURVEY UNIT DESIGN INFORMATION Survey Unit 20 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 which are illustrated on map FRO I 1 U20-DIRT (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 1,300 m2 area were required for the Class I survey unit. This was accomplished by use of an in situ ganmna spectroscopy detector (ISOCS) configured at a 3-meter or 2-meter distance from the surface to obtain overlapping 28-n 2 (or smaller) fields of view. The ISOCS detector was positioned perpendicular to the surface, as appropriate, to provide 100% scan coverage of the surface.

Locations and orientation of the 82 survey scans are shown on maps FROI I 1U20-SCAN and FROl1 1U20-NONVERT.

The ISOCS scans were configured to ensure 100% scan coverage of all exposed surfaces within Survey Unit 20. 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-0I1 1-20, Revision 0 Page 2 of 23

TABLE 1 SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria Basis Area 1,300 m2 Class 1, < 2,000 m2 Based on an LBGR of 1.2 pCi/g, Number of Direct sigma' of 1.33 pCi/g, and a relative Measurements Required shift of 0.8.

-___ 2Type I = Type 1= 0.05 Sample Area 32.5 m 1,300 M 2 / 40 = 32.5 rn2 Sample Grid Spacing 5.7 m (32.5)"'

Scan Grid Area ISOCS scans at 2 and See Section B Scan Grid Area _______ 3 meters Area Factor 1.7 Class 1 Area, LTP Table 6-12 Scan Area 1,300m Class I Area- 100%

1.0 pCig Cs-137 ISOCS investigation levels with Scan Investigation Level detector at 2 and 3-meter height 0.36 pCilg Co-60 (Reference 3)

DCGL 2.39 pCi/g Cs-137 Reference 1 4.03 pCi/g Cs-137 DCGL x Area Factor for Class 1 Design DCGLEMc 1.45 pCilg Co-60 survey unit, per LTP Section 5.6.3 C. SURVEY RESULTS A total of 40 direct measurements were performed in Survey Unit 20. Five samples contained Cs-137 with levels of residual activity below the DCGL. One of these also contained Co-60 in excess of the DCGL, but below the design DCGLEmc. All other measurements were below the MDA. The results are presented in Table 2. The elevated Co-60 reading at location S010 was investigated as discussed in Section D.

ISOCS gamma scans were performed at 82 locations using an investigation level of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. Media appropriate geometries were applied to each ISOCS measurement. The gamma scans were performed for a sufficient count time to achieve a Minimum Detectable Activity (MDA) of approximately 28% 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 4, Table 5-IC for RCA Yard West, RO100 FR-Ol 11-20, Revision 0 Page 3 of 23

TABLE 2 DIRECT MEASUREMENTS ample bc umbr Cs-137 (pC/g) Uncertainty (pCQg) Co-60 (pCilg) Uncertainty (pCi/g) Rule of UnityValue Unitized FRO111201SOOI < 4.58E-02 < 4.54E-02 7.20E-02 FR0111201S002 < 3.61E-02 < 4.15E-02 6.34E-02 FR0111201SO03 < 4.49E-02 < 4.59E-02 7.22E-02 FRO111201SO04 < 4.32E-02 < 4.19E-02 6.68E-02 FRO111201SOOS < 5.16E-02 < 5.55E-02 8.61E-02 FRO111201SO06 < 3.52E-02 < 3.98E-02 6.10E-02 FRO111201S007 < 4.65E-02 _ < 4.63E-02 7.33E-02 FRO111201S008 < 4.65E-02 < 4.22E4-02 6.85E-02 FRO111201SOO9 < 4.81E-02 < 5.06E-02 7.90E-02 FRO111201SO10 1.77E-01 4.OOE-02 1.40E+00 8.09E-02 1.70E+00 FRO111201SOll < 5.38E-02 < 5.94E-02 9.16E-02 FRO111201SO12 < 3.96E-02 < 4.70E-02 7.12E-02 FR0111201S013 < 5.26E-02 _ < 5.45E-02 8.54E-02 FRO111201SO14 < 5.66E-02 < 5.61E-02 8.89E-02 FR0111201S015 2.78E-01 4.68E-02 < 6.68E-02 1.94E-O1 FRO111201SO16 < 5.19E-02 < 5.21E-02 8.23E4-02 FRO1t201SO17 < 5.61E-02 _ < 6.26E-02 9.63E-02 FRO111201SO18 < 3.912-02 < 4.42E-02 6.78E-02 FR0111201SO19 < 5.082-02 < 5.39E-02 8.39E-02 FRO111201SO20 < 5.11E-02 < 5.12E-02 8.09E-02 FRO111201SO21 < 7.732-02 < 6.06E-02 1.03E-01 FR0111201S022 < 4.47E-02 < 5.36E-02 8.10E-02 FR0111201S023 < 4.81E-02 < 5.40E-02 8.29E-02 FR0111201S024 < 4.42E-02 _ < 4.73E-02 7.35E-02 FR0111201S025 < 4.92E-02 _ < 5.32E-02 8.24E-02 FR0111201S026 < 7.292-02 < 6.21E-02 1.032-01 FRO111201S027 < 4.54E-02 < 4.62E-02 7.27E-02 FR0111201S028 < 5.52E-02 < 5.27E-02 8.44E-02 FRO111201S029 < 4.60E-02 < 4.87E-02 7.59E-02 FRO111201SO30 < 5.36E-02 _ < 5.44E-02 8.57E-02 FRO111201SO31 2.16E-01 4.11E-02 < 6.53E-02 1.66E-01 FR0111201S032 < 5.40E-02 < 5.83E-02 9.04E-02 FR0111201S033 < 7.52E-02 < 6.302-02 1.05E-01 FR0111201S034 < 6.06E-02 c 5.182-02 8.56E-02 FROII1201SO35 < 4.38E-02 < 4.642-02 7.23E-02 FR0111201S036 1.69E-01 3.98E-02 < 4.922-02 1.28E-01 FR0111201S037 < 5.662-02 < 5.31E-02 8.54E-02 FR0111201S038 < 4.422-02 < 4.422-02 6.99E-02 FRO111201S039 < 7.182-02 < 5.70E-02 9.63E-02 FRO111201SO40 8.09E-02 3.60E-02 < 8.95E-02 1.38E-01 Mean . 6.78E-02 8.66E-02 1.292-0I Median 5.14E-02 5.29E-02 834E-02 Standard Deviation 5.10E-02 2.13E-01 2.56E-01 Range 3.52E-02 to 2.78E-01 3.98E-02 to 1.40E-01 6.10F-02 to 1.70E+00

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

FR-0111-20, Revision 0 Page 4 of 23

D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS The areal extent of elevated activity around direct sample S010 (which exceeded the DCGL) was determined by obtaining additional soil samples and an ISOCS scan at the original sample location. Sample locations are detailed on map XRO 1 U20-DIRT. The investigation was conducted via survey investigation package XRO11-20. Only environmental levels of Cs-137 (i.e., < 0.19 pCi/g) were detected, all Co-60 results were less than MDA. Based on the data, it was determined that the extent of contamination was limited to the volume of direct sample S010 (1,000 ml). Since no plant-derived residual activity was found present after re-sampling, the survey unit meets the DCGLEMc unity rule.

The investigation results are summarized in Attachment 3 (Table 3-1).

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 primarynuclides of concern, non-detect values for these nuclides were assumed to be present at the MDA. Of the 40 soil samples collected, five identified Cs-137 activity below the DCGL value of 2.39 pCi/g. Additionally, one of these samples also contained Co-60 in excess of the DCGL. 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-137 and Co-60.

The average of the DCGL unity fractions was 0.129, indicating that the direct measurements averaged 12.9% 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 (0.068 pCi/g). This would equate to an annual dose rate of 0.0 mrenL/year.

Taking into account the average residual contamination level for Co-60, the annual dose rate would equate to 0.77 mremnyear 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 Attachmenit E to Maine Yankee Procedure PMP 6.7.8 (Reference 2).

3 This annual dose equivalent isbased 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 Annual Dose Rate = 7.67 x (0.0866) =0.77 mrem I y FR-0l 11-20, Rcvision 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 LT? 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; however, elements required further evaluation. As discussed in Sections D and 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. One measurement exceeded the DCGL for Co-60. The results for the balance of the direct samples were below the DCGLs of 2.39 pCilg for Cs-137 and 0.86 pCi/g for Co-60 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 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.

FR-O1 11-20, Revision 0 Page 6 of 23

H. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The PSS of Survey Unit 20 was designed, performed, and evaluated in May 2005. 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.

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

The survey design parameters are presented in Table l. The required number of direct measurements was determined for the Sign Test in accordance with the LTP. As presented in Table 2, all but one of the direct measurements were less than the DCGLs of 2.39 pCi/g Cs-137 and 0.86 pCi/g Co-60. The measurement that exceeded the DCGL did not exceed the design DCGLEMC. Further, the investigation results indicate that all of the detectable Co-60 contamination in the elevated region was contained in the original sample itself. The direct measurement area activity was shown not to exceed the unity rule (as defined in Section 5 of Reference 1). This is demonstrated in Table 3-1 of Attachment 3.

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-normnal distribution with one outlier.

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 at a distance of 3 meters or 2 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-01 1 Survey Unit 20 meets the release criteria of I OCFR20.1402 and the State of Maine enhanced criteria.

J. REFERENCES

1. Maine Yankee License Ternination 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-OI 11-20, Revision 0 Page 7 of 23

Attachment 1 Survey Unit Maps FR-0111-20, Revision 0 Page 8 of 23

DecMalnsionine pTeIrn Maine Yankee DecommissioningProjectSurvey Map MI D# fRO11 UOSrrE Survey Type: Chorocterizoalon Turnover

• Final Slaus Survey i SurveyAreaNamne: Site Location 0

r' a, at rn FR-01 11-20, Revision 0 Page 9 of 23

Maine Yankee Maine Yankee DecommissioninglProject SurveMap I~~DF~lU0lF Deconyrksslonio Toom I SurveyType: Charocterizabon Turnover Fid StatusSurvey veyea Name: Approximate Excavotion Depths 4 26m-.

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0 50m FR-01 11-20, Revision 0 Page 10 of 23

DMdne Ycnngeea Maine Yankee DecommissioningProjectSurvey Map Mcp ION FROMl 1U20-DIRT SurveyTypo: Characteflzatbln Turnover i FhlaIStotusSurvey I SkrveyAroNafoe: Direct Locations 4- 26m I

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0 50m FR-01 11-20, Revision 0 Page 11 of 23

ManeYank e Docommrissionlino learn -I Maine Yankee DecommissioningProjectSurvey Map MaP IDMFRO111 U20-SCAN Survey Type: Chorocteizotion Turnover

• Fhal Status Survey I SurwAea Name: Scan Locations 4 26m -

1 K-Im S002 S003 S004 SOns 1 m --- K l m m Xsoo= X 0 30 s0060e l S007 SOOB S009 $010 Soil S012 S013

-M 0 0 0 0 M.

S014 S015 S016 S017 S018 S019 0 0 0 0 0 S020 S021 S022 S023 S024 S025 S02E

-00 0 0 0 0 0 S027 S028 S029 S030 S031 S032 0 0 0 0 0 0 50m S033 S034 S035 S036 S037 S038 S039

-0X 0 eP) 09 X0' S040 S041 S042 8043 S044 S045 S046 S047 S048 _ 0A4 ' S050 >-$051 S052 S053 S054 S055 S056 S057 0 0 X 0 0 0 S059 S060 S061 S062 s961O S064 S065 T -5 Z4m ._

40m S066 S067 4, S068 S069 S070 S071

• _ Xz 0X 3 4r K-v_^ lm- 34 T I ,immmmm El " I-I I I I I I 50m FR-OI 111-20, Revision 0 Page 12 of23

DeconerYreNsksnTeare I Maine Yankee Decommissioning Project Survey Map I Survey Type: Charocteizolon Turnover Final Status Survey I Survey Area Name: NonVefricol (detedor position) Scan Locofons

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50m II I I I I f I I-A I- i 71-I I I I Im . . . . . 61116016 61 I I I I 6 FR-01 11-20, Revision 0 50m Page 13 of 23

Mdne Yflso)ee Maine Yankee Decommissioning Project Survey Map Mcr0 XROI 11 WO)DIRT SzveV Type: Characterialobon Turnover 3 FinolStaousSuvey I SwveyAreaNamne: Direct Locations 50m I

If I J I I I I I I I II b 50m FR-01 11-20, Revision 0 Page 14 of 23

Attachment 2 Survey Unit Instrumentation FR-011 1-20, Revision 0 Page 15 of 23

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

Detector No. MDC (pCi/g) 7780 0.144 to 0.332 7722 0.157 to 0.316 7607 0.150 to 0.349 HPGe Detectors (Laboratory Analysis)

Detector No. MDC (pCi/g) l FSSI 0.045 to 0.090 FSS2 0.035 to 0.075 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL AND DCGLEMIC Parameter Instrument: ISOCS Comments Scan MDC 0.15 0.14 toto 0.35 0.24 pCi/g pCifgCs-137 Co-60 -28% DCGL 2.39 pCig C-137 Approved DCGL for land DCGL 0.6p~g Co6 areas inside the Restricted 0.6_il o6 Area (Reference 1)

Investigation Level 1.0 pCilg Cs-137 (ISOCS i, 2 and 3 m) 0.36 pCi/g Co-60 (Reference 3) 4e03 p~i/g Cs-137 DCGL x Area Factor for Design DCGLEMC 14.0 pCilg Cs-603 Class I survey unit, per LTP 1.45 ~ilg o-60Section 5.6.3 FR-0 11-20, Revision 0 Page 16 of 23

Attachment 3 Investigation Table FR-01 11-20, Revision 0 Page 17 of 23

TABLE 3-1 INVESTIGATION TABLE FSS SURVEY RESULTS INVESTIGATION RESULTS Sample Reason Direct unity Sample ED CS-137 CO-60 DCGL

_ Value (pOU2) (PC!W Comparison SO10 Direct unity 1.70 XROI112OIXOIOSS < 4A91-02 <4.75E-02 <DCGL value is greater XROI 1201XNlOSS 1.84E-01 43.63E-02 < 6.28E-02 <DCGL unitized DCGL XR0111201 XEIOSS < 4.52E-02 < 4.78E-02 <DCGL XR1011120tXSIOSS 1.27E-01

• 2.91E-02 < 6.01E-02 <DCGL XRO11 1201XWIOSS 1.08E-01

• 3.01E-02 < 6.74E-02 <DCGL ISOCS ID XRO111201XOIOGS < 3. IE-01 < 2.20E-01 <DCGL SU Mean / DCGL 0.129 Total 0.129 NOTES

1. Sample XO1OSS was obtained at a depth of 6"- 12". All other samples were obtained at a depth of 0" - 6".

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

FR-01 11-20, Revision 0 Page 18 of 23 I

Attachment 4 Statistical Data FR-O1 11-20, Revision 0 Page 19 of 23

Survey Package FROI1 Unit 20 UNITY Soil Sign Test Summary Survey Package: FRO1III Survey Unit: 20 _

Evaluator DR DCGLw: 1.OOE+00 Unity DCGLa,: 1.70E+00 LBGR: 5.00E-01 Sigma: 5.56E-01 (1.33 pCilg /2.39 pC/g)

Type I error 0.05 Type II error 0.05 Nuclide: UNITY Soil Type: NIA Z.<: 1.645 Zap:, .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 Number of Samples: 40 Median: 8.34E-02 Mean: 1.29E-01 Net Sample Standard Deviation: 2.56E-01 Total Standard Deviation: 2.56E-01 Sum of samples and reference Maximum: 1.70E+00 Adjusted N Value: 40 _

S+ Value: 39 _

Critical Value: 25 _ __ _

Sign test results: Pass Sufficient samples collected: Pass Maximum value <DCGL,,: Investigate SU Passes See Table 3-1 Median value <DCGL,: Pass Mean value <DCGL,: Pass Maximum value <DCGLe:,,: Pass Total Standard Deviation <=Sigma: Pass Criteria comparison results: Investigate SU Passes The survey unit passes all conditions:[ Investigate SU Passes FRO1I I -SU20-SciKSignrUN1TY FR-0I 11-20, Revision 0 5/21/05 3:32 PM Page 20 of 23

FRO1 11 SU-20 Quantile Plot 2

N B_ 1.5 z

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• Activity . >>

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.2 0.5 0

0 0 25 50 75 100 Percent

One-Sample T-Test Report Page/Date/Time 2 5/23/05 7:14:42 AM Database Variable C2 Plots Section Histogram of FR-01I1. SU-20 50.

VI 4, 38-0.

E o 25-

.0 E

Z 13 4 i 0.000 U. 0.500 1.000 i .500 2.DO0 Activity (unitized)

FR-01 11-20, Revision 0 Page 22 of 23

One-Sample T-Test Power Analysis Page/Date/Time 2 5/23/05 7:15:57 AM Chart Section Retrospective Power Curve 1.0-, .. 0 0.84-L-.

a) 0.6]-

3:

a.

0.4-f 0.2-u.u_ I 0.1 0:3 0'5 0.7 0.9 1'1 Survey Unit Mean (unitized)

FR-01 11-20, Revision 0 Page 23 of 23