ML051050076

Final Status Survey Release Record FR-0111 Yard West Excavations Survey Unit 11

ML051050076
Person / Time
Site:	Maine Yankee
Issue date:	03/08/2005
From:	Ambrose J, Dockins L, Madison G, Packer J, Pillsbury G Maine Yankee Atomic Power Co
To:	NRC/FSME
References
FR-0111-11, Rev 0
Download: ML051050076 (23)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0111 YARD WEST EXCAVATIONS SURVEY UNIT 11 Prepared By: . . Date: . i FSS Engineer - Signature Printed Name Reviewed By: _ _ _ _ _ Date: 3_____o_

F Specialist - Signature Printed Name Reviewed By: -DE Gt- Date: 3 0 Independent Review - Signature Approved By: o k_

P rinted Nm Date: 3 perintenSM - Signature Printed Name Approved By: H_ ,Date: 38 FSS, MOP - Signature Printed Namne Revision 0

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0111 YARD WEST EXCAVATIONS SURVEY UNIT 11 A. SURVEY UNIT DESCRIPTION FR-01 11, Yard West Excavations Survey, Unit 11 is a 1517m2 rectangular excavated soil area approximately 26 meters wide extending northward approximately 58 meters from the north end FR-0l 11 Survey Unit 10. The hole was created in part as a result of the excavation of contaminated sub-surface soil at locations S074 and S075 as identified in Characterization Survey Package CR5000. Also contributing to the size and depth of this area was the removal of portions of storm drain piping and catch basins, LSA and RCA Building slabs, CR-3 foundations, and the High Rad Bunker sump drain line.

The area is bounded to the west by FR-OII1 Survey Units 8 and 9, south by FR-Oi II Survey Unit 10, and east by FR-OI1I Survey Unit 14. Eventually, it will be bounded on the north by FR-0 11I Survey Unit 12 and east by FA-0400 (Fuel Building). The survey unit's northeast corner is located at coordinates 407,772 N / 623,790 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-O I11 Survey Units is shown on Map FROI 1IUl 1-SITE (Attachment 1). An abstract of the terrain levels and excavated depths is shown on map FROI I lU I -INFO (Attachment 1).

B. SURVEY UNIT DESIGN INFORMATION Survey Unit 11 met the LTP Revision 3 definition for a Class 1 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. 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 40 locations. The direct point locations are illustrated on map FROI11 lUI1-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 1,517 m 2 area were required for the Class 1 survey unit. This was accomplished by use of an in situ gamma spectroscopy detector (ISOCS) configured at 2.0 or 3.0-meter distance from the surface to obtain overlapping 12-in 2 or 28-M2 fields of view respectively. The ISOCS detector was positioned perpendicular to the surface. Locations of the 143 survey scans are shown on the three scan maps in Attachment 1.

The combination of all ISOCS scans ensured 100% scan coverage of all exposed surfaces within Survey Unit 11. 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. As shown in this table, 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 DCGLENrC, no EMC sample size adjustment was necessary.

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

TABLE 1 SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria Basis Area 1,517m' Class 1, < 2,000 m2 Based on an LBGR of 1.2 pCi/g, Number of Direct sigmal of 1.33 pCi/g, and a relative Measurements Required 40 shift of 0.8.

Type I = Type II = 0.05 Sample Area 38 m 2 1,517 m2 /40 = 38 m2 Sample Grid Spacing 6.2 m (38) n Scan Grid Area ISOCS scan at various See Section B distances Area Factor 1.62 Class 1 Area, LTP Table 6-12 Scan Area 1,517 m2 Class 1 Area- 100%

ISOCS investigation levels with 1.0 pCi/g Cs-137 detector at 3-meter height (28 m2 0.36 pCi/g Co-60 FOV) geometry.

Scan Investigation Level (Reference 6)

ISOCS investigation levels with 2.2 pCi/g Cs-137 detector at 2.0-meter height (12 m2 0.8 pCi/g Co-60 FOV) geometry.

(Reference 6)

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

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

Design DCGLE.C 3.9 pCi/g Cs-137 DCGL x Area Factor for Class I Des___________ 1.4 pCifg Co-60 survey unit, per LTP Section 5.6.3 LTP Revision 3, Table 5-4C for RCA Yard West, ROIOO.

FR-OI I1-11, Revision 0 Page 3 of 23

C. SURVEY RESULTS A total of 40 direct measurements were performed in Survey Unit 11. The results are presented in Table 2. All the direct measurements were below the DCGL.

ISOCS soil gamma scans were performed at 107 locations using investigation levels of 1.0 pCi/g Cs-I 37 and 0.36 pCi/g Co-60 for the 28 m2 field of view and 23 locations with investigation levels of 2.2 pCi/g Cs-137 and 0.8 pCi/g Co-60 for the 12 m2 field of view.

ISOCS concrete gamma scans were performed at 13 locations where previously unsurveyed remnants of the LSA building pad and containment wall footers were uncovered using investigation levels of 2.2 pCi/g Cs-137 and 0.8 pCi/g Co-60 for the 12 m2 field of view.

The ISOCS scans were designed to achieve overlapping scan coverage to ensure 100 percent coverage for the survey unit. The gamma scans were performed for a sufficient count time to achieve a Minimum Detectable Activity of approximately 30% of the DCGL. An evaluation was performed to determine the effect of three inches of water attenuation on the survey results with no significant impact found on the original data. All scan measurements were below the respective investigation levels. Therefore, no investigation surveys were performed as a result of the scan surveys.

FR-Ol 11-1 1, Revision 0 Page 4 of 23

TABLE 2 DIRECT MEASUREMENTS ample Numer Co-60 (pCi/g) Uncertainty

( Cs-137 (pCilg) Uncertainty

( Unitized Unitv_Value Rule of FROI1-11-ISOOI-SS-Dirt < 5.48E-02 < 4.6313-02 8.31EE-02 FRO il-1 l-IS002-SS Dirt < 5.68E-02 < 5.63E-02 8.96E-02 FROI 11-1 1-IS003-SS-Dirt < 6.01E-02 < 5.0313-02 9.09E-02 FRO Ill-lI- IS004-SS-Dirt < 6.30E-02 9.62E-02 3.57E-02 1.14E-01 FRO 11-1-1 -IS005-SS-Dirt < 5.0113-02 2.50E-01 4.25E-02! 1.6313-01 FROI11-11-IS006-SS-Dirt < 5.80E-02 4.94E-01 5.97E-02 2.74E-01 FROI 11-II-S007-SS-Dirt < 4.33E-02 < 4.2613-02 6.82E-02 FRO1I1-11-IS008-SS-Dirt < 6.13E-02 < 5.38E-02 9.38E-02 FROI 1-1 I-IS009-SS-Dirt < 6.7613-02 1.61E-01 3.56E-02 1.4613-01 FROII-1 1-ISOIO-SS-Dirt < 6.33E-02 3.47E-01 4.62E-02 2.19E-01 FROI 1-11-IS011-SS-Dirt < 5.8013-02 1.66E-01 3.86E-02 1.37E-01 FROI11-1 I-IS012-SS-Dirt < 6.59E-02 < 6.6513-02 1.04E-01 FRO11-11-IS013-SS-Dirt < 6.78E-02 1.92E-01 4.2613-02 1.5913-01 FRO 11-1-1 -IS014-SS-Dirt < 5.0713-02 4.55E-01 5.199E-02 2.49E-01 FROI 1-1 1-IS015-SS-Dirt < 7.41E-02 2.01E-01 4.3913-02 1.70E-01 FROII1-11-IS016-SS-Dirt < 5.991E-02 < 5.58E-02 9.3013-02 FRO11-11-IS017-SS-Dirt < 6.111E-02 < 5.4213-02 . 9.3713-02 FROI 1-1 1-IS018-SS-Dirt < 6.47E-02 1.96E-01 4.2613-02 1.5713-01 FROI 1-11-15019-SS-Dirt < 7.47E-02 3.20E-01 4.69E-02 2.21E-01 FROII11-1-IS020-SS-Dirt < 6.50E-02 < 5.6313-02 9.91E-02 FROII-1-1 S021-SS-Dirt < 5.17E-02 < 4.4613-02 7.88E-02 FROI 1-11-IS022-SS-Dirt < 4.96E-02 < 4.87E-02 7.81E-02 FRO I II-1 -1S023-SS-Dirt I 3.09E-01 4.17E-02 < 5.61E-02 3.83E-01 FROI 1- I- IS024-SS-Dirt < 4.98E-02 < 4.94E-02 7.86E-02 FRO1I1-11-IS025-SS-Dirt < 4.49E-02 < 4.44E-02 _ 7.08E-02 FROI 11-1 1-IS026-SS-Dirt < 5.271E-02 1.28E-01 3.0513-02 1.I5E-01 FRO1II-11-1S027-SS-Dirt < 4.56E-02 < 4.15E-02 7.04E-02 FRO11I-11-IS028-SS-Dirt < 5.6613-02 < 5.06E-02 8.7013-02 FRO 11- 1-1 S029-SS-Dirt < 5.8813-02 < 5.68E-02 9.21E-02 FRO I11-1 1-IS030-SS-Dirt < 8.7913-02 < 7.03E-02 1.32E-01 FRO111-11-IS031-SS-Dirt < 5.13E-02 < 4.74E-02 7.95E-02 FRO I11-1 1-IS032-SS-Dirt < 5.6013-02 < 5.6313-02 8.8713-02 FROII1-11-IS033-SS-Dirt < 5.20E-02 < 4.5813-02 7.9613-02 FRO 1I1-1 1-1S034-SS-Dirt < 4.55E-02 < 4.9713-02 7.37E-02 FRO 1I1-1 1-IS035-SS-Dirt < 5.8013-02 < 6.7413-02 9.5613-02 FROI 1-1 1-IS036-SS-Dirt < 5.4513-02 < 5.12E-02 8.48E-02 FRO I11-1 1-1S037-SS-Dirt < 6.30E-02 8.13E-02 3.32E-02 1.07E-01 FROI 11-1-1 S038-SS-Dirt < 7.19E-02 2.57E-01 4.4913-02 1.9113-01 FROI -1 -- 1 S039-SS-Dirt < 8.6013-02 1.59E-01 3.82E-02 1.66E-01 FROII-11 -IS040-SS-Dirt < 5.1713-02 < 5.1813-02 8.18E-02 Mean 6.5413-02 1.20E-01 1.2613-01 Median 5.8013-02 5.6313-02 9.47E-02 Standard Deviation 4.0813-02 1.1513-01 6.68E-02 Range 4.33E-02 to 3.09E-01 4.15E-02 to 4.94E-01 6.82E-02 to 3.83E-01

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

FR-OI 11-11, Revision 0 Page S of 23

D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS Based on the direct and 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. Of the 40 soil samples collected, 15 identified Cs-137 activity below the DCGL value of 2.39 pCi/g while I sample identified Co-60 activity below the DCGL value of 0.86 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 both Co-60 and Cs-137. The average of the DCGL unity fractions was 0.126 and the maximum reported unity value was less than 39% of the unitized DCGL. The Elevated Measurement Comparison Unity test was not performed since all reported sample activities were less than the DCGL for both Co-60 and Cs-137.

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 (0.13 pCi/g). This would equate to an annual dose rate of 0.0 mremlyear.

Taking into account the average residual contamination level for Co-60, the annual dose rate would equate to 0.58 mrem/year?. However, 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 5).

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 mremn/y. Therefore, the annual dose rate would equate to (0.0654 Annual Dose Rate = 7.67 x 0 = 05 8 mrem ly FR-OI I-I1, Revision 0 Page 6 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 well as a listing of the key release criteria. As is shown in the table, all of the key release criteria were clearly satisfied for the FSS of this survey unit. 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 value data listed in Table 2. The data set and plot are consistent with expectations for a Class 1 survey unit. All of the measurements are well below the DCGLs of 2.39 pCi/g for Cs-l 37 and 0.86 pCi/g for Co-60 for land inside the restricted area. The one outlier was approximately 38% of the unitized DCGL.

3. A Histogram Plot was also developed based on the unity 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 I 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 11 was designed, performed, and evaluated in February 2005. The design was performed to the criteria of the LTP Revision 3 (References 2 and 4). LTP Change No.05-001 (Reference 7) modified the Table 6-1 1, "Contaminated Material DCGL,"

to reflect an increased Deep Soil DCGL of 0.86 pCi/g for Co-60. As a result, the retrospective dose calculation was modified to include 2.04 mrem/y from Deep Soil and 5.63 mrem/y from Surface Soil. No subsequent LTP changes with potential impact to this survey unit need to be evaluated.

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

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 I. 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-137 and 0.86 pCi/g Co-60.

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 the 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 (Reference 1) with significant aspects of the design discussed in Section B and Table 1. No scan measurements exceeded the investigation levels. Therefore, no investigations were required.

It is concluded that FR-0111 Survey Unit 11 meets the release criteria of 10CFR20.1402 and the State of Maine enhanced criteria.

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. 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

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 05-001, Deep Soil Co-60 DCGL FR-01 I -1l 1,Revision 0 Page 8 of 23

Attachment 1 Survey Unit Maps FR-OI 11-11, Revision 0 Page 9 of 23

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FR-Ol 11-1 1, Revision 0 z.

Page 14 of 23

Maine Yankee DecomtlTvlonln* Team Maine Yankee DecommissioningProject SurveyMap I Map ID#FROl 1Ul 1-CONC Survey Survey Type: E] Characterization [:] Turnover

• Final Status Survey Survey Area Name: Concrete Scan Locations 0 FR-OI 11-11, Revision 0 2O Page 15 of 23 3

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

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

Detector Number  ! MDC (pCilg) 7780 j 0.13 to 0.43 7607 1 0.10 to 0.38 HPGe Detectors (Laboratory Analysis)

Detector Number MDC (pCi/g) J

'FSS1 0.04 to 0.09 FSS2 0.04 to 0.07 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DESIGN DCGLENIC Detector J Instrument: ISOCS l Comments Scan MDC 0. 14 to 0.43 pCi/g Cs- 13 7 -30% DCGL 0.10 to 0.25 pCilg Co-60 DCGL 2.39

.86 pCi/g

~i/g Cs-137 o-60areas Approved insideDCGL for land the Restricted

.8 Area, (References 4 and 7)

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

Investigation Level 2.2 pCi/g Cs-137 (Reference 6)

(ISOCS i, 2 m) 0.8 pCi/g Co-60 l pCi/g Cs- 37 3.9 DCGL x Area Factor for Design DCGLE-MC 1.4 pCi/g Co-60 Class 1 survey unit, per 4 CLTP _ Section 5.6.3 FR-OI Il-l 1, Revision 0 Page 17 of 23

Attachment 3 Investigation Table (There were no investigations)

FR-O1 11-11, Revision 0 Page 18 of 23

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

Survey Package FRO11 Unit 11 UNITY Soil Sign Test Summary

n"53Ev auatio'inP t~i ~i-(, i.i 9 ,c rrns '; t-Survey Package: FRO111 Survey Unit: 11 Yard West Excavations Evaluator: G. Madison DCGL,: 1.OOE+00 Unity DCGLe,: 1.60E+00 AF x Unity LBGR: 5.00E-01 50% of DCGL Sigma: 5.66E-01 Unitized Design Sigma Type I error: ".- 0.05 Type II error: 0.05 Nuclide: UNITY Soil Type: N/A

,i 'aW Values ,, jr. ,' Comments .

Zst: ' -.. 1.645 L;},' , ,>¢'t, ' 1 Z1p .645 Signp 07.88145 Calculated Relative Shift: ' 0

..1 ' :,0.8 _____.:

Relative Shift Used: 0.8 Uses 3.0 If Relative Shift is >3 N-Value: , 33 N-Value+20%: 40 Samnpl' Data Values Com e ..

Number of Samples: l ; 40 Median: - 9.47E-02 Mean: , 1.26E-01 Net Sample Standard Deviation: . -6.68E-02 Total Standard Deviation: .-6.68E-02 Sum of samples Maximum:'  :;' 3.83E-01 Adjusted N Value: - -. 40 S+ Value: <'40 CriticalValue: :.. 25 Sign test results:- '. "Pass

-: -M. , i A.. orne.CriteiSi Sufficient samples collected: ' . :Pass Maximum value <DCGL,: *Pass Median value <DCGL ': Pass Mean value <DCGLW: 'Pass Maximum value <DCGLemc: Pass Total Standard Deviation <=Sigma: Pass Criteria comparison results:l , -' Pass SurveyUnitPasses The survey unit passes all conditions: PassSre ntPse FROI I 1-SU1I1-SoilSign-UNITY 2/22/05 8:40 AM FR-OI I I-I I, Revision 0 Page 20 of 23

FR-01 11 SU-1 1 Quantile Plot 4.50E-01 4.OOE-01 3.50E-01 N 3.OOE-01 2.50E-01 ** IV

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

One-Sample T-Test Power Analysis Page/Date/Time 2 3/3/05 1:15:49 PM Chart Section Retrospective Power Curve U--

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FR-0 I I 1-11, Revision 0 Page 23 of 23