ML043500333

Final Status Survey Release Record FR-0110-02, Rev 0, Pab Alleyway Survey Unit 2.

ML043500333
Person / Time
Site:	Maine Yankee
Issue date:	12/07/2004
From:	Cooper W, Pillsbury G Maine Yankee Atomic Power Co
To:	NRC/FSME
References
FR-0110-02, Rev 0
Download: ML043500333 (22)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-O11O PAB ALLEYWAY SURVEY UNIT 2 Revision 0

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-01I0 PAB ALLEYWAY SURVEY UNIT 2 A. SURVEY UNIT DESCRIPTION Survey Unit FROI 10-02 is an excavated area that consists of soil media. The excavation was made in order to remove buried pipes running between the PAB and the Containment Spray Building. The survey unit is located near grid coordinates 407,500 N and 623,800 E using the Maine State Coordinate System (West Zone) NAD 1927, as shown on Map FR 01 10-00, Attachment 1.

The Alleyway was a paved area located above the pipe excavation within the Restricted Area, bordered on the west by the Personnel Hatch, Main Steam Valve House, Reactor Motor Control Center, and the Emergency Feedwater Pump Room, on the east by the Service Building, and by the PAB on the north. The survey unit is approximately 130 m .

B. SURVEY UNIT DESIGN INFORMATION The area was designated a Class I land survey unit per the LTP (Table 5-lC, R0100, RCA Yard West). The Alleyway excavation was begun in late 2002 and the removed soil was spread and surveyed for possible reuse. Nearly all of the removed soil was found to be acceptable for reuse. The soil survey effort was suspended when the ground froze, and'upon returning to soil surveying in the spring of 2003, it was determined that radioactivity had migrated into the remaining soil from the open, abandoned pipes in the excavation pit.

Consequently, significant soil remediation had to be performed. Since the survey unit was already Class 1, no reassessment of classification was required.

The survey unit design parameters are shown in Table 1. Given a relative shift of 1.2, it was determined that 23 direct measurements were required for the Sign Test; however, the number of samples was increased to improve the area factor. Fifty-two direct measurements were actually performed. Measurement locations were determined using a fixed grid with a randomly determined start point and are illustrated on the map FROI 10-SS-02 (Attachment 1). All direct measurements consisted of soil samples obtained at the required locations. The samples were analyzed by laboratory gamma spectroscopy.

Twenty-eight scan grids of from approximately 3 m2 to 6 m2 were established, as indicated on survey map FROI 10-02. A 100% scan coverage of the area was required. The survey instruments used, their MDCs, and alarm setpoints are provided in Attachment 2.

Background values were established for the scan measurements based on local scaler values in the survey area. These background values were used to establish scan alarm setpoints and to confirm the scan MDCs used were appropriate. Since the design DCGLENIC is greater than the investigation level, no sample size adjustment is necessary.

FR-OI 10-02, Revision 0 Page 2 of 22

TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit J Design Criteria Basis Area 130 mL < Class I limit per LTP Rev. 3 Based on an LBGR of 1.6 pCi/g, sigma of 1.33 pCi/gl, Number of Direct 50 (23 required) and a relative shift of 1.2, N Measurements Required 5vas adjusted to increase the area factor.

Type I = Type IJ = 0.05 Sample Area 2.6 m' 130 m / 50 l Sample Grid Spacing 1.5 m x 1.5 m (2.6 me) /2 Scan Grid Area Variable - 3 to 6 m' Area Factor 4.2 (conservative) LTP Rev 3, Table 6-12 Scan Survey Area 130 m' Class I Area- 100%

Background  ; .

SSPA-3 (scan) Average 1000 cpmbackground + DI 6-150, LTP Section 5 Scan Investigation Level - 12.0 2-2) EC-009-01 (MY) (Reference l)

(See Table 2-2) E-0-1(Y Rfrne1 DCGL 3.2 pCi/g2 LrTP Rev. 3 and Addenda (Reference 3 and 4)

Design DCGLENIC 13.4 Area factor

• DCGL C. SURVEY RESULTS As required, 52 direct soil samples were collected and the results are presented in Table 2.

One of the direct measurements was greater than the DCGL unity fraction. The maximum direct result was 1.15 times the DCGL unity fraction and the mean residual activity is 22% of the unity fraction.

The 28 grids were scanned. No verified alarms occurred. As there were no verified alarms in the scan survey, no investigations were required.

It should be noted that the Co-60 DCGL is 0.86 pCi/g. This is an "adjusted DCGL" and can be derived from the unitized dose for surface soil, LTP Table 6-7 and the updated dose model in the activated concrete related license amendment (Reference 5 and 6). The Co-60 DCGL for surface soil is 1 pCi/g x 10/6.58 mrem/y (from LTP Table 6-7) or 1.5 pCi/g Co-60. This DCGL is further limited by the dose contribution allowed for surface soil only in the basement fill model per LTP Section 6 Attachment IX (revised LTP Table 6-11), in the activated concrete license amendment. Thus, the Co-60 adjusted DCGL is 1.5 pCi/g x 5.63/10 mrem/y or 0.86 pCi/g.

Design sigma from the LUP Rev. 3 Table 5-1 C for R0100, RCA Yard West.

2 Design initially used from a DCGL of 3.2 pCi/g Cs-137 but is evaluated to the revised 2.39 pCi/g Cs-137 DCGL (Reference 5).

FR-OI 10-02, Revision 0 Page 3 of 22

TABLE 2 DIRECT MEASUREMENTS Cs-137 Uncrtainty Unitized Value Sample Number SIpe N m e Co-60 (pCilg) J_ Unertainty

_ _ _ _ __ (pCilg) __ _ _ _ _ _ of Unity Rule FROII0-02-SOOI <5.68E-02 <6.05E-02 0.09 FRO] 10-02-S002 <5.72E-02 <5.21E-02 0.09 FR0110-02-S003 <6.14E-02 <6.01 E-02 0.10 FRO] 10-02-S004 <6.80E-02 <5.64E-02 0.10 FRO1IO-02-SO05 <5.32E-02 <5.68E-02 0.09 FRO 10-02-S006 <5.96E-02 <6.34E-02 0.10 FRO I10-02-S007 <5.65E-02 <5.81E-02 0.09 FROI 10-02-S008 <5.38E-02 5.33E-02 2.79E-02 0.08 FRO I10-02-S009 <5.66E-02 <3.42E-02 0.08 FRO1 10-02-S010 <6.52E-02 <6.97E-02 0.10 FRO I10-02-SOI1 <5.81 E-02 <6.03E-02 0.09 FR0110-02-S012 <6.12E-02 <5.64E-02 .0.09 FROI 10-02-S013 <6.04E-02 <6.43E-02 0.10 FRO10-02-S014 <7.04E-02 <5.84E-02 0.11 FROI 10-02-S015 <6.79E-02 <6.07E-02 0.10 FROI10-02-S016 <6.08E-02 <6.02E-02 0.10 FRO I10-02-S017 <6.61E-02 <5.3 1E-02 0.10 FRO110-02-S018 <6.32E-02 <5.22E-02 0.10 FR0110-02-SO19 9.66E-01 7.14E-02 <5.66E-02 1.15 FRO I10-02-S020 <7.72E-02 <5.88E-02 0.11 FROI 10-02-S021 8.87E-02 2.68E-02 <5.93E-02 0.13 FRO110-02-S022 <7.88E-02 <4.72E-02 0.11 FROI 10-02-S023 9.01E-02 3.25E-02 <5.36E-02 0.13 FROI 10-02-S024 <6.09E-02 <4.90E-02 0.09 FROI 10-02-S025 <7.36E-02 <6.54E-02 0.11 FRO] 10-02-S026 <6.07E-02 <5.55E-02 0.09 FRO I10-02-S027 2.29E-01 4.21E-02 5.66E-02 3.39E-02 0.29 FROI 10-02-S028 <8.70E-02 <6.1 IE-02 0.13 FRO I10-02-S029 <7.01E-02 <6.18E-02 0.11 FROI 10-02-S030 1.73E-01 3.OOE-02 1.21E-01 3.38E-02 0.25 FROI 10-02-S031 4.14E-01 5.01E-02 2.71E-01 5.39E-02 0.59 FROI 10-02-S032 <1.05E-01 <7.81 E-02 0.15 FROI 10-02-S033 2.07E-01 4.59E-02 1.57E-01 5.13E-02 0.31 FROI 10-02-S034 <5.92E-02 <6.13E-02 0.09 FRO 10-02-S035 9.14E-02 2.54E-02 <5.51E-02 0.13 FROI 10-02-S036 <8.54E-02 5.33E-02 3.25E-02 0.12 FROI 10-02-S037 <8.32E-02 <7.69E-02 0.13 FROII0-02-S038 1.62E-01 3.23E-02 2.25E-01 4.86E-02 0.28 FRO 10-02-S039 2.38E-01 4.26E-02 2.97E-01 4.54E-02 0.40 FROI 10-02-S040 3.27E-01 4.58E-02 4.45E-01 6.99E-02 0.57 FR-01 10-02, Revision 0 Page 4 of 22

FRO] 10-02-S041 <7.88E-02 8.69E-02 3.15E-02 0.13 FROI 10-02-S042 7.99E-02 2.87E-02 1.19E-01 3.74E-02 0.14 FRO 10-02-S043 <6.81E-02 1.18E-01 3.13E-02 0.13 FRO] 10-02-S044 2.60E-01 4.24E-02 4.01E-0I 6.65E-02 0.47 FROI 10-02-S045 <9.20E-02 1.94E-01 4.09E-02 0.19 FROI 10-02-S046 1.70E-01 4.84E-02 1.14E-01 3.68E-02 0.25 FRO I10-02-S047 1.88E-01 3.73E-02 1.49E-01 4.40E-02 0.28 FRO 10-02-S048 1.42E-01 3.11E-02 1.14E-01 3.72E-02 0.21 FRO I10-02-S049 2.76E-01 4.49E-02 1.99E-01 4.82E-02 0.40 FROI 10-02-S050 6.68E-01 5.83E-02 4.94E-01 6.57E-02 0.98 FROI 10-02-S051 1.30E-01 3.31E-02 1.60E-01 4.10E-02 0.22 FRO 10-02-S052 6.67E-01 6.13E-02 5.26E-01 7.34E-02 0.996 Mean 1.49E-01 1.19E-0I1 0.22 Median 7.88E-02 6.12E-02 _ 0.12 Standard Deviation 1.76E-01 1.17E-01 0.24 Range 0.053 to 0.97 _ 0.034to 0.53 _ 0.080 to 1.147

"<" indicates values less than the minimum detectable activity (MDA)

D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS Survey Unit 2 was partitioned into 28 scan grids as shown on map FR 01 10-02 (Attachment 1). No grids had scans which exceeded the alarm setpoints, so no investigations were required. One direct measurement exceeded the new DCGL. This sample was not investigated because there was no scan alarm. However, the sample has been included in the Elevated Measurement Comparison 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, are provided in Table 2. Of the 52 soil/rock samples, one had concentrations of Co-60 and Cs-137 that exceeded unity. The average of the DCGL unity fractions was 0.22 and the maximum unity fraction was 1.15 times the DCGL. The Elevated Measurement Comparison unity test conservatively includes the one direct sample that was in a grid that was not investigated. The EMC test was 45% of unity, passing the EMC test. Final sigma was less than the design sigma, and when combined with the extra samples designed into the survey, no additional samples were required.

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 established mean fallout Cs-137 background value 3 (0.19 pCi/g) for disturbed soil from the survey unit sample mean Cs-137 activity (0.119 pCi/g). The result is a net value of

-0.071 pCi/g or 0.0 mremly. When the survey unit mean for Co-60 (0.149 pCi/g) is included, this would equate to an annual dose rate of 0.97 mrem/y 4 . However, for the purposes of demonstrating compliance with the radiological criteria for license termination and the enhanced State Criteria, background activity is not subtracted from the soil sample analysis activity values.

3 See Attachment E to Maine Yankee Procedure PMP 6.7.8 (Reference 2) 4 Based on DCGL of 0.86 and 5.63 mrem/y at the DCGL per the LTP FR-01 10-02, Revision 0 Page 5 of 22 I

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 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. As is shown in the table, all of the key release criteria, except for one elevated sample, were clearly satisfied for the.FSS of this survey unit. The elevated sample met the EMC unity limit. Therefore, all requirements were satisfied.

2. The Quantile Plot was generated from direct measurement data listed in Table 2. The data set and plot are consistent with expectations for a Class I survey unit. The survey unit average is well below the DCGLs of 0.86 pCi/g and 2.39 pCi/g for Co-60 and Cs-1 37 respectively.

3. A Histogram Plot was also developed based on the direct measurement values. This plot shows that the direct data were essentially a log-normal distribution with three outliers.

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 I area; the FSS results were consistent with that classification. The direct measurement sample standard deviation was less than the design sigma. Thus, no additional measurements were required. Since the DCGLs were changed (decreased) by addendum to the LTP to account for the activated containment concrete pathway the design of the survey unit was confirmed and data reviewed against the revised DCGLs. The direct sample that is above DCGL unity would not be above unity with the previous, higher DCGLs.

FR-O 10-02, Revision 0 Page 6 of 22

11. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 2 was designed and performed per the criteria LTP Rev. 3 wvith Addenda (References 3 and 4). The subsequent LTP change with potential impact to this FSS requiring evaluations was the LTP change related to the activated concrete license amendment (References 5 and 6) which reduced the DCGLs for soil inside the RA.

These changes were evaluated and found to have no impact on the FSS results or conclusions for this survey unit. The revised DCGLs were used for the evaluation of the results included herein.

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, the average of the direct measurements was well below the DCGL unity. The one elevated sample met the elevated measurement comparison unity limit per LTP methodology.

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 wvere met. Attachment 4 also revealed that direct measurement data represented essentially a log-normal distribution, with three outliers.

The scan survey design for this survey unit was developed in accordance with the LTP with significant aspects of the design discussed in Section B and Table 1. There were no alarms, so no alarm investigations were required.

It is concluded that FRO 110 Survey Unit 2 meets the release criteria of I OCFR20. 1402 and the State of Maine enhanced criteria.

FR-O 10-02, Revision 0 Page 7 of 22

J. REFERE NCES

1. Maine Yankee Engineering Calculation, EC-009-01

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

3. Maine Yankee License Termination Plan, Revision 3, Maine Yankee letter to NRC, MN-02-048, dated October 15,2002

4. Maine Yankee License Termination Plan, Revision 3, Maine Yankee letter to NRC, MN-02-061, dated November 26,2002

5. Proposed License Amendment Related to Changes in the Activated Concrete Remediation Plans, Maine Yankee letter to the NRC, MN-03-049, dated September 11, 2003

6. Issuance of License Amendment No. 170, NRC letter to Maine Yankee, dated February 18,2004 FR-O 10-02, Revision 0 Page 8 of 22

Attachment I

• Survey Unit Maps FR-OI 10-02, Revision 0 Page 9 of 22

Maine Yankee - Alaitne yatikee DecomminissiolingProjectSurvey ForinIMap ID #: FR 0110-00 Decommissioning Team I Survey Type: 3 Characterization El Turnover 13Final Status Survey Survey Area Name: Alleyway Excavation Date: 6-25-03 623.000 E 623.500 E 624,000 E 624,500 E 625,000 E oaD o CD4 o4) 0 o C> o (0

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Attachment 2 Survey Unit Instrumentation FR-01 10-02, Revision 0 Page 14 of 22

TABLE 2-1 INSTRUMENT INFORMATION E-600 SIN I Probe SIN (type) 2491 l 726560 (SSPA-3) I 2488 [ 725890 (SSPA-3)

IIPGc Detectors for Lab Analysis of Volumetric Samples Detector Number I MDC (pCi/g)

FSS-1 0.04 - 0.10 IFSS-2 0.04-0.10 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DCGLENIC Detector J SSPA-3 J Comments Scan MDC 5.9 Design Scan MDC, LTP (pCi/g) . Table 5-6 (Reference 4)

DCGL 2.39 Cs-137 Reference 5 (pCi/g) 0.86 Co-60 Investigation Level 18,950 3 sigma of Background (Alarm Setpoint) (- 84% Cs-137 DCGLEMC) + Background + 6.1 pCi/g DCGLEMC 14.3 Cs-137 DCGL

• AF (pCi/g) 5.2 Co-60 (6.0 as performed)

FR-01 10-02, Revision 0 Page 15 of 22

Attachment 3 Investigation Table FR-OI 10-02, Revision 0 Page 16 of 22

TABLE 3-1 INVESTIGATION TABLE

[ INITIAL SURVEY INVESTIGATION RESULTS rAlarm Scan Max. Elevated' Ae DCGLEMICCo6TCs37 CLEC Grid 5 Setpoint Value Scan Areaa 2

Unity Sample Number lCo60 Cs-137 DCGLENiC

-. cpm -cpm Value m Factor AF pCi/g pCi/g Unity S020 18950 18930 N/A 4.5 3.9 3.9 FROI 10-02-SO19 9.66E-01 7,14E-02 <5.66 E-2 0.25

_ Unit mean 1.33E-01 1.20E-0lj 0.20

- EMC Unity Sum l 0.45

"<"indicates values less than the minimum detectable activity (MDA) 6 S020 is the value from the direct sampling, included because the direct value was >DCGL but there was no alarm in the grid.

6 The elevated area was conservatively assumed to be the area bounded by (4) adjacent sample points (2.12m x 2.12m =4.5 m2); therefore, the AF= 3.9 (Reference LTP Table 6-12).

FR-01 10-02, Revision 0 Page 17 of 22

Attachment 4 Statistical Data FR-O1 10-02, Revision 0 Page 18 of 22

Survey Package FRO110 Unit 2 UNITY Soil Sign Test Summary Eval ation Input alues'.i- 1... .".* ommnfs Survey Package: FRO110 Alleyway Excavation Survey Unit: 02 Evaluator: WJC DCGL,,: 1.00Ef00 DCGLem: 6.OOE+00 As performed LTP 6-12 130152 LBGR: 5.00E-01 Sigma: 5.56E-01 based on new 2.39 pCi/g Cs137 DCGL Type I error: 0.05 Type II error: 0.05 Nuclide: UNITY Soil Type: NIA

.- Ca culatedValues!,-,,q.'.f t ZlF: 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 A .-Samp e aDa a. I Number of Samples: 52 Median: 1.24E-01 Mean: 2.23E-01 Net Sample Standard Deviation: 2.39E-01 Total Standard Deviation: 2.39E-01 Sum of samples and reference Maximum: 1.15E+00

-;,.','-Jw'.¢R9C i'.est Res~uitsg . 'A.o,.....men st Adjusted N Value: 52 S+ Value: 51 Critical Value: 32 Sign test results: . Pass

-'  ; riteka atisfatin < C rnentsf,* ,,

Sufficient samples collected: Pass Maximum value <DCGL,: -Investigate Sign test passes (Critical value <S+)

Median value <DCGL,,: - Pass Mean value <DCGL.: Pass Maximum value <DCGL,: Pass Total Standard Deviation <=Sigma: Pass Criteria comparison results: - :'.,Investigate The survey unit passes al ctions:- -Iigate Ssfato- Csmrnen passe The survey unit passes all conditions: --. Investigate Satisfactory -passes FROl 10-SU2-SoiISign-UN1TY.xls FR-01 10-02, Revision 0 126/04 5:18 PM Page 19 of 22

FR-0110 SU-2 Quantile Plot 1.4 1.2 0a) 1 N

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One-Sample T-Test Report Page/Date/Time 2 11/29/04 9:15:18 AM Database C:\Program Files\NCSS97\FRO1 IOSU2.SO Variable C2 Plots Section Histogram of FR-0110, SU-2 50

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E z 12.500 n n U.OUUI 0.000 0.300 b.6o b.sod 1200 Activity (unitized)

FR-0 110-02, Revision 0 Page 21 of 22

One-Sample T-Test Power Analysis Page/Date/Time 2 11/29/04 9:16:29 AM Chart Section Retrospective Power Curve 1.0- -_ - .

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I I I \ I I I I I 0.0 I l I 0.2 0.4 0.6 0.8 1.0 1.2 Survey Unit Mean (unitized)

FR-OI 10-02, Revision 0 Page 22 of 22