ML050590102

Final Status Survey Release Record FR-0900 Balance of Plant Areas Survey Unit 1

ML050590102
Person / Time
Site:	Maine Yankee
Issue date:	02/17/2005
From:	Olsen C, Packer J, Pillsbury G, Randall D, Tozzie R Maine Yankee Atomic Power Co
To:	Document Control Desk, NRC/FSME
References
FR-0900-01, Rev 0
Download: ML050590102 (31)

Text

!I; MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0900 BALANCE OF PLANT AREAS SURVEY UNIT 1 Prepared By: 49,Q /KL Date: /

FSS Engineer - Si nature Pel A

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Printed Name Reviewed By: Date: al° S FSS Spdt gu Printed Name Reviewed By: Date: 16 F&? V Independent Review - Signature

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MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0900 BALANCE OF PLANT AREAS SURVEY UNIT I A. SURVEY UNIT DESCRIPTION FR-0900 Survey Unit 1, Balance of Plant Areas, is an open land area. The majority of the area is made up of open land, but some wooded locations are also included. Accessible open land areas were selected for survey. These five major areas are shown on map FRO900-02.

FR-0900 Survey Unit I is shown in relationship to the Maine State Coordinate System (West Zone), NAD 1927 and other major site structures in map FRO900-01. All maps referenced in this release record are provided in Attachment 1, unless othervise noted. The survey unit's total area is approximately 71,050 m2 . This total area conservatively includes areas that were or will be surveyed in other survey units.'

B. SURVEY UNIT DESIGN INFORMATION FR-0900 Survey Unit 1 was designated a Class 3 survey unit. The survey unit design parameters are summarized in Table 1. Given a relative shift of 3.0, it was determined that 14 direct measurements were required for the Sign Test. Five additional sample locations were added due to the size of the survey unit. Measurement locations were determined using the random point method, are designated as shown in Table 2, and are illustrated on the map FRO900-03 (Attachment 1). All direct measurements consisted of soil samples obtained at the required locations. The samples were analyzed with laboratory gamma spectroscopy.

Three hundred seventy-five scan grids of nominal 1 m x 10 m size were established as indicated on survey maps. One percent to 10% scan coverage of the area was required. 2 Scan areas are indicated on Maps FRO900-04 through FRO900-08 (Attachment 1). The 10 m2 scan grids were made to provide a total of 3,750 m (5.2% of the survey unit area coverage).

The instruments used in this survey 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 and the investigation level.

Background values were established for the scan measurements based on local scaler values in the survey unit. These background values were used to establish scan alarm setpoints and to confirm the scan MDCs used were appropriate. Due to variability in background within the survey unit, the grids were divided into twelve different background groups based on the location. These are specified in Table 1.

Examples of other survey areas/units include FB-1400, FB-2600, FR-0800, FR-0900-03, and FR-0910.

2 LTP Table 5-3 FR-0900-0 1, Revision 0 Page 2 of 31

TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria Basis Area 71,050 m2 Class 3, no limit Based on an adjusted LBGR of Number of Direct 2.76 pCi/g, sigma 3 of 0.48 pCi/g, Measurements Required 14 and a relative shift of 3.0.

Type I = Type II= 0.05 Sample Area N/A Class 3 Area Sample Grid Spacing N/A Class 3 Area Scan Grid Area 1mxlOm <= 10 m2 Area Factor N/A Class 3 Area Scan Survey Area Approximately 3,750mg Class 3 area I -10%

Background r * - $i 2A Background (cpm) Scan Grid Group 8,810 Group A 9,720 Group B 10,330 Group C 10,300 Group D 10,616 Group E SPA-3 10,900 Group F 11,718 Group G 11,727 Group H 11,866 Group I 12,350 Group J 13,350 Group K 13,950 Group L 3 sigma of background See Table 2-2, Attachment 2 Scan Investigation Level plus background. EC-009-01 (MY) (Reference 1)

DCGL 4.2 pCilg LTP Revision 3 (Reference 2)

Design DCGLEMc N/A Class 3 Area C. SURVEY RESULTS Fourteen direct soil measurements were required, 19 were taken and the results are presented in Table 2. All direct measurements were below the DCGL. In addition, 11 biased samples were selected based on surface water flow and ground topology, these results were below the DCGL and are presented in Table 3. Seventy-five verified alarms were received during the soil scans and required investigation. In addition, 22 grids required investigation due to other reasons (i.e., low background or temperature). The investigation results are discussed in Section D.

3 Design sigma based on LTP Revision 3, Table 5-1 C, Balance of Plant Areas, FR-0900.

FR-0900-01, Revision 0 Page 3 of 31

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

FR-0900-01-3S007 1.70E+00 4 1.32E-01 FR-0900-01-3S008 5.62E-01 I 5.01E-02 FR-0900-01-3S010 4.04E-02 : 1.62E-02 FR-0900-01-3S015 8.90E-02 + 2.29E-02 FR-0900-01-3S016 < 4.31E-02 FR-0900-01-3S017 2.09E-01 + 3.22E-02 FR-0900-01-3S018 < 3.11E-02 FR-0900-01-3S019 3.17E-02 FR-0900-01-3S020 < 3.49E-02 FR-0900-01-3S021 4.82E-02 + 1.74E-02 FR-0900-01-3S022 2.76E-02 + 1.72E-02 FR-0900-01-3S023 < 3.20E-02 FR-0900-01-3S024 < 3.60E-02 FR-0900-01-3S025 5.87E-02 +/- 2.13E-02 FR-0900-01-3S026 5.74E-02 4 3.24E-02 FR-0900-01-3S027 8.38E-02  : 3.53E-02 FR-0900-01-3S028 8.09E-02 + 3.85E-02 FR-0900-01-3S029 5.22E-01 + 6.80E-02 FR-0900-01-3S030 1.76E-01 1 4.92E-02 Mean 2.03E-01 Median 5.74E-02 Standard Deviation 3.96E-01 Range 2.76E 1.70E+00

• Samples were also analyzed for Co-60; all were less than an MDA of 0.072 pCi/g FR-0900-ol, Revision 0 Page 4 of 31

TABLE 3 BIAS DIRECT MEASUREMENTS Samplc Number Cs-137 (pCi/g)*

FR-0900-01-3-SOOI 3.51E-01 + 4.20E-02 FR-0900-01-3-S002 9.37E-01 + 6.76E-02 FR-0900-01-3-S003 3.76E-01 + 4.64E-02 FR-0900-01-3-S004 3.70E-01 4 3.60E-02 FR-0900-01-3-S005 5.66E-01 i 5.83E-02 FR-0900-01-3-S006 3.99E-02 i 1.81E-02 FR-0900-01-3-S009 1.04E-01 2.59E-02 FR-0900-01-3-SOI I 1.45E+00 + 1.16E-01 FR-0900-01-3-S012 8.13E-01 + 6.92E-02 FR-0900-01-3-S013 1.76E-01 i 3.01E-02 FR-0900-01-3-S014 1.51E-01 t 2.65E-02 Mean 4.85E-01 Median 3.70E-01 Standard Deviation 4.29E-01 Range 3.99E-02 - 1.45E+00

• Samples were also analyzed for Co-60; all were less than an MDA of 0.05 pCi/g D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS The 97 scan grids which required additional investigation were examined by taking a soil sample at the highest SPA-3 count rate location for each grid. Except as noted below, all investigation results are presented in Table 3-1. In addition, except for the reclassified portion of the Survey Unit, as noted below, all samples collected were in the range of background for Cs-137 and were less than the MDA for Co-60.

For eight of the grids, an isotopic in-situ gamma scan (ISOCS) was performed over 100% of the scan grid area. The ISOCS measurements were required due to the depth/thickness of ice and water in the survey grid exceeding the SPA-3 limits. The ISOCS action levels were set at 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. All results were less than the action limits as shown in Table 3-1 (Attachment 3).

FR-0900-O1, Revision 0 Page 5 of31

The scan of grid S103 resulted in a verified alarm. The follow-up investigation determined that the cause of the scan alarm was a small volume of contaminated soil media. This contaminated media was completely collected into a 1-liter sample. The contaminated portion was subsequently segregated to a 100 g aliquot of soil media that was found to contain Co-60 with a specific activity of 1,030 pCi/g. In accordance with the License Termination Plan (LTP), (Reference 3) the subject area was reclassified into a Class I survey unit. Three reclassified grids with alarms are not included in Table 3-1.

The biased selection of grid S103 in survey unit one was based primarily on the topology and drainage of the surrounding area and the fact that it lay in close proximity to an exterior staircase walkway and a paved roadway. Since the adjacent roadway was crowned and will be surveyed as a separate survey unit, 100% of the down gradient ditch, and a portion of the lower hillside adjacent to the ditch, was selected for reclassification.

Since the contaminated area was isolated to a I m2 area, the 104 m2 area of FR-0900 Survey Unit 2 was deemed adequate to achieve the design objectives of both the Class I survey unit and a Class 2 buffer unit, which would typically surround a Class 1 survey unit.

The reclassification resulted in grids SI00 thru grids S109 being removed from FR-0900-01 and placed into the scan area for FR-0900-02. The resulting scan area for Survey Unit 1 is 3,650 m2 or 5.1% of the original design area and is, therefore, acceptable.

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. The maximum direct measurement result was less than 40.4% of the Cs-137 DCGL. The level of activity is not unexpected for undisturbed soil. Further, since the activity is less than the action levels in LTP Table 5-7, no additional investigations or any additional reclassification is 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 (0.19 pCi/g) for disturbed soil from the survey unit sample mean activity. When the established background value is subtracted from the mean sample results of 0.203 pCi/g for the survey unit, the result is 0.013 pCilg.

This would be equivalent to an annual dose rate of 0.031 mrem/y4 . However, for 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.

The biased samples contained Cs-137 in concentrations that are consistent with those expected for background, based on the values given in Maine Yankee Procedure PMP 6.7.8 (Reference 4). No Co-60 was detected in the biased samples.

4 See Attachment E to Maine Yankee Procedure PMP 6.7.8 (Reference 4).

Annual dose rate = 0.013/4.2 x 10 = 0.031 mrem/y.

FR-0900-01, Revision 0 Page 6 of 31

F. ADDITIONAL DATA EVALUATION Attachment 4 provides additional data evaluation associated with this Survey Unit, including relevant statistical informnation. 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.

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 3 survey unit. All of the measurements are below 50% of the DCGL which is 2.1 pCi/g.

3. A Histogram Plot was also developed based on the direct measurement values. This plot shows that the direct data were essentially a normal distribution with one outlier. The outlier is approximately 40.4% of the DCGL.

4. A Retrospective Power Curve was constructed, based on FSS results. The curve showvs 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 THE EXTENT OF RESIDUAL ACTIVITY The survey was designed as a Class 3 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.

H. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit I was designed, performed and evaluated in late 2003 to early 2005.

The design was performed to the criteria of the LTP, Revision 3 (Reference 3). No subsequent LTP changes with potential impact to this survey unit needed to be evaluated.

FR-0900-01, Revision 0 Page 7 of 31

I. CONCLUSION The FSS of this survey unit was designed based on the LTP based classification as a Class 3 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 50% of the DCGL of 4.2 pCi/g.

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 normal distribution, with one outlier.

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. All verified alarms wvere investigated and determined to be less than the DCGL.

It is concluded that FR-0900 Survey Unit I meets the release criteria of 10CFR20.1402 and the State of Maine enhanced criteria.

J. REFERENCES

1. Maine Yankee Engineering Calculation, EC 009-01

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

3. NRC letter to Maine Yankee, dated February 28, 2003, Approval of LTP Rev. 3 and Addenda

4. 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 FR-0900-01, Revision 0 Page 8 of3l

Attachment 1 Survey Unit Maps FR-0900-01, Revision 0 Page 9 of 31

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Attachment 2 Survey Unit Instrumentation FR-0900-01, Revision 0 Page 18 of 31

TABLE 2-1 INSTRUMENT INFORMATION E-600 S/N SSPA-3 Probe S/N 1625 725332 1933 726561 2488 725328 2488 725890 1645 725890 2489 726560 2490 2255 2490 726554 2490 726560 2491 2055 1641 726561 2618 726561 2619 2255 2619 725328 2621 726561 2620 725890 2620 726560 2621 725328 2621 726560 HPGe Detectors for Lab Analysis of Volumetric Samples Detector Number MDC (pCilg)

FSS-1 0.01-0.10 FSS-2 0.02 - 0.08 DET-2 l 0.10 -0.20 DET-3 0.12-0.13 ISOCS Detector for Field Measuremencts Detector Number MDC (pCi/g)

ISOCS - 7607 0.2 -0.6 FR-0900-01, Revision 0 Page 19 of 31

TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DCGLEINIC Parameter Comments DCGL Approved DCGL for land areas (PCi/g) 4.2 Cs-137 outside the Restricted Area, LTP Section 6.7 (Reference 2)

SPA-3 Scan MDC 5.9 Design Scan MDC, LTP Table 5-6 (pCi/g) Rev 3 Addenda (Reference 2)

ISOCS Co-60 0.23 - 0.31 Sean MDC Cs-137 0.25 - 0.53 36% DCGL (Pci/g)__ _ _ _ _ _ _ _ _ _ _ _ _ _ _

10,990 Group A 12,000 Group B 12,690 Group C 12,700 Group D SPA-3 13,000 Group E Investigation Level (Alarm setpoint) 13,300 Group F cpm 14,200 Group G and H 14,390 Group I 14,900 Group J 16,000 Group K 16,690 Group L ISOCS .pigCs 37 Action Level .0 pCi/g Cs-137 Class 3 Area (pCi/g) 0.36 pCi/g Co-60 FR-0900-01, Revision 0 Page 20 of 31

Attachment 3 Investigation Table FR-0900-01, Revision 0 Page 21 of 31

TABLE 3-1 INVESTIGATION TABLE FSS SURVEY RESULTS _ INVESTIGATION RESULTS Alarm Scan Scaler CS-137 DCGL Grid Reason Setpoint Measurement Measurement Sample ID (CS-ig) Comparison (epm) (cpm) (cpm)(pi/g)ompari S034 ALARM 14,200 14,750 15,850 XR0900-01-3-S034-SS <6.48E-02 <DCGL S035 ALARM 14,200 14,420 14,030 XR0900-01-3-S035-SS 3.31E-02 h 8.87E-03 <DCGL S036 ALARM 14,200 14,550 13,710 XR0900-01-3-S036-SS 5.61E-02 +/- 2.31E-02 <DCGL S038 ALARM 14,200 14,210 13,320 XR0900-01-3-S038-SS 1.61E-01 2.47E-02 <DCGL S042 ALARM 14,200 14,420 17,170 XR0900-01-3-S042-SS <6.04E-02 <DCGL S074 LOW BK 14,200 13,180 10,600 XR0900-01-3-S074-SS 1.78E-01I 4.43E-02 <DCGL S075 LOW BK 14,200 12,650 10,440 XR0900-01-3-S075-SS 1.43E-01 d 3.59E-02 <DCGL S076 LOW BK 14,200 13,070 9,970 XR0900-01-3-S076-SS <6.77E-02 <DCGL S077 LOW BK 14,200 12,590 10,750 XR0900-01-3-S077-SS <6.12E-02 <DCGL S080 LOW BK 14,200 12,370 11,520 XR0900-01-3-S080-SS <5.21 E-02 <DCGL S082 < 0 OF 16,000 15,720 11,450 XR0900-01-3-S082-SS <4.87E-02 <DCGL S083 < 0 OF 16,000 15,750 12,320 XR0900-01-3-S083-SS <6.42E-02 <DCGL S084 < 0 °F 16,000 15,680 11,360 XR0900-01-3-S084-SS 9.53E-02 :3.42E-02 <DCGL S085 <00 F 16,000 15,660 10,710 XR0900-01-3-S085-SS <5.3 IE-02 <DCGL S087 ALARM 14,390 14,390 13,680 XR0900-01-3-S087-MS < I.05E-01 <DCGL XR0900-01-3-A087-SS 6.56E-02 h 1.74E-02 <DCGL S088 INSUFFICIENT 14,390 14,150 11,230 XR0900-01-3-S088-SS <4.92E-02 <DCGL SCAN SURVEY ISO S XR0900-01 S088-GS-XOOI <5.08E-01 <DCGL TIME in(vsiC. XR0900-01-3-S088-GS-X002 <5.31 E-0 I <DCGL investigation) XR0900-01 S088-GS-X003 <4.83 E-0 I <DCGL S094 ALARM 14,390 14,900 12,710 XR0900-01-3-S094-SS <2.44E-02 <DCGL S095 ALARM 14,390 14,660 12,390 XRO900-01-3-S095-SS 8.36E-02 k 1.77E-02 <DCGL S098 ALARM 16,690 17,420 15,000 XR0900-01-3-S098-SS 6.22E-02 + 2.1 1E-02 <DCGL S110 ALARM 16,690 17,930 16,170 XR0900-01-3-SI 10-SS 2.73E-02 1.43E-02 <DCGL Sill ALARM 16,690 21,700 20,800 XR0900-01-3-SI I I-SS 2.07E-02 + 6.36E-03 <DCGL S112 ALARM 16,690 18,660 16,370 XR0900-01-3-SI 12-SS <2.46E-02 <DCGL S113 ALARM 16,690 18,720 16,650 XR0900-01-3-S1 13-SS 4.15E-02 +/- 1.49E-02 <DCGL FR-0900-01, Revision 0 Page 22 of 31

FSS SURVEY RESULTS INVESTIGATION RESULTS Alarm Scan Scaler CS-137 DCGL Grid Reason Setpoint Measurement Measurement Sample ID (CS-ig) Comparison (cpm) (cpm) _(cpm)__Cmas S114 ALARM 16,690 19,410 19,100 XR0900-01-3-SI 14-SS <6.43E-02 <DCGL S115 ALARM 16,690 21,500 19,500 XR0900-01-3-S1 15-SS 1.25E-01 + 1.51E-02 <DCGL S116 ALARM 14,200 15,550 14,610 XR0900-01-3-S1 16-SS 8.49E-02 E 1.90E-02 <DCGL SI 17 ALARM 14,200 16,770 15,360 XR0900-01-3-S1 17-SS 5.04E-02 +/- 1.37E-02 <DCGL S 19 ALARM 16,690 20,900 17,530 XR0900-01-3-SI 19-SS 2.68E-02 +/- 1.36E-02 <DCGL S 121 ALARM 16,690 20,500 20,600 XR0900-01-3-S121-SS <6.23E-02 <DCGL S122 ALARM 16,690 19,480 17,580 XR0900-01-3-S122-SS 4.84E-02 +/- 1.56E-02 <DCGL S123 ALARM 16,690 19,320 21,600 XR0900-01-3-S123-SS <7.81 E-02 <DCGL S126 LOW BK 16,690 15,170 12,130 XR0900-01-3-S126-SS <5.93E-02 <DCGL S 127 ALARM 16,690 17,710 16,460 XR0900-01-3-S127-SS 4.63E-02 +/- 1.55E-02 <DCGL S128 LOW BK 16,690 15,270 13,260 XR0900-01-3-S 128-SS <4.32E-02 <DCGL S129 LOW BK 16,690 16,410 12,720 XR0900-01-3-S129-SS <5.22E-02 <DCGL S132 LOW BK 16,690 15,650 13,220 XR0900-01-3-S132-SS 9.96E-02 +/- 3.37E-02 <DCGL (ISOCS XR0900-01-3-SI 32-GS-XOO I <5.23E-01 <DCGL ison XR0900-01-3-SI 32-GS-X002 <5.1 OE-0 I <DCGL investigation XR0900-01-3-S 132-GS-X003 <5.05E-01 <DCGL S133 LOW BK 16,690 15,260 12,790 XR0900-01-3-S133-SS 1.30E-01 +/- 5.09E-02 <DCGL XR0900-01-3-SI 33-GS-XOOI <5.23E-01 <DCGL (ISOCS XR0900-01-3-S133-GS-X002 <4.66E-01 <DCGL investigation XR0900-01-3-S 133-GS-X003 <4.86E-01 <DCGL S134 ALARM 14,200 14,330 13,820 XR0900-01-3-S134-SS <5.65E-02 <DCGL S141 ALARM 12,690 13,920 11,710 XR0900-01-3-S141-SS 3.09E-02 +/- 1.30E-02 <DCGL S 144 ALARM 14,200 15,880 14,820 XR0900-01-3-S 144-SS 1.44E-01 +/- 2.09E-02 <DCGL S 147 ALARM 16,690 17,540 14,460 XR0900-01-3-S147-SS 1.24E-01 +/- 2.07E-02 <DCGL S148 ALARM 16,690 17,420 14,690 XR0900-01-3-S148-SS 3.57E-02 +/- 1.28E-02 <DCGL S 149 ALARM 16,690 17,390 15,780 XR0900-01-3-S149-SS <2.77E-02 <DCGL S150 LOW BK 10,990 10,960 9,070 XR0900-01-3-S150-SS 7.39E-01I 5.79E-02 <DCGL S151 ALARM 10,990 13,730 12,100 XR0900-01-3-S1515-SS 1.10E+00 +/- 8.33E-02 <DCGL S152 ALARM 10,990 14,880 10,960 XR0900-01-3-S152-SS 5.53E-01 +/- 4.73E-02 <DCGL S153 ALARM 10,990 12,210 11,140 XR0900-01-3-S153-SS 1.16E+00 +/- 7.84E-02 <DCGL FR-0900-01, Revision 0 Page 23 of 31

FSS SURVEY RESULTS INVESTIGATION RESULTS Alarm Scan Scaler CS-137 DCGL Grid Reason Setpoint Measurement Measurement Sample ID (pCi/g) Comparison

. (cpm) (cpm) (cpm)

S157 LOW BK 10,990 7,830 6,570 XRO900-01-3-S157-SS 2.37E-01 +/-3.24E-02 <DCGL S158 LOW BK 10,990 7,830 7,000 XR0900-01-3-S158-SS 2.75E-01 + 3.01E-02 <DCGL S159 LOW BK 10,990 7,750 6,050 XR0900-01-3-S159-SS 2.13E-01 +/-3.24E-02 <DCGL S162 LOW BK 10,990 8,460 7,640 XR0900-01-3-S162-SS 4.95E-01 h4.09E-02 <DCGL S164 ALARM 10,990 14,460 10,760 XR0900-01-3-S164-SS 4.66E-01 E3.87E-02 <DCGL S165 ALARM 10,990 14,570 11,080 XR0900-01-3-S165-SS 1.1OE-01 +/- 2.26E-02 <DCGL S177 ALARM 12,700 13,320 11,550 XR0900-01-3-S177-SS 1.53E-01I 4.95E-02 <DCGL S180 ALARM 12,700 13,200 13,000 XRO900-01-3-S180-SS <6.30E-02 <DCGL S182 ALARM 12,700 13,690 12,440 XRO900-01-3-S182-SS <7.84E-02 <DCGL S186 ALARM 12,700 13,040 11,950 XR0900-01-3-S186-SS <4.36E-02 <DCGL S187 ALARM 12,700 13,540 11,050 XRO900-01-3-S187-SS <4.57E-02 <DCGL S188 ALARM 12,700 17,910 16,160 XRO900-01-3-S188-SS <5.83E-02 <DCGL S189 ALARM 12,700 14,500 14,990 XRO900-01-3-S189-SS <5.81E-02 <DCGL S195 ALARM 13,300 13,350 12,170 XR0900-01-3-S195-SS <6.44E-02 <DCGL S256 ALARM 13,300 13,890 11,590 XRO900-01-3-S256-VS <1.25E-01 <DCGL S274 Low BK 14,200 13,180 11,420 XRO900-01-3-S274-SS <5.66E-02 <DCGL S278 ALARM 13,000 14,850 13,890 XRO900-01-3-S278-SS <5.09E-02 <DCGL S294 ALARM 12,000 12,160 9,540 XRO900-01-3-S294-SS <6.22E-02 <DCGL S296 ALARM 12,000 12,340 12,600 XR.900-01-3-S296-SS <6.29E-02 <DCGL S297 ALARM 12,000 15,210 12,820 XRO900-01-3-S297-SS <6.91E-02 <DCGL S300 ALARM 12,000 12,270 10,480 XRO900-01-3-S300-SS <5.68E-02 <DCGL S301 ALARM 12,000 12,610 10,600 XRO900-01-3-S301-SS <5.09E-02 <DCGL S302 ALARM 12,000 12,520 11,060 XR0900-01-3-S302-SS <5.82E-02 <DCGL S303 ALARM 12,000 12,670 10,380 XRO900-01-3-S303-SS <4.93E-02 <DCGL S304 ALARM 12,000 12,850 10,730 XRO900-01-3-S304-SS <5.63E-02 <DCGL 5305 ALARM 12,000 13,680 10,630 XR0900-01-3-S305-SS <5.33E-02 <DCGL S309 ALARM 12,000 12,150 9,220 XRO900-01-3-S309-SS <6.75E-02 <DCGL (ISOCS XRO900-01-3-S309-GS-XOOI <5.1 OE-0 I <DCGL investigation XRO900-01-3-S309-GS-X002 <5.1OE-01 <DCGL XR0900-01-3-S309-GS-X003 2.95E-01 + 1.74E-O1 <DCGL FR-0900-01, Revision 0 Page 24 of 31

FSS SURVEY RESULTS INVESTIGATION RESULTS Alarm Scan Scaler DCGL Grid Reason Setpoint Measurement Measurement Sample ID C-137 Co r

_cpm) ( cpm) (cpm) (pCi/g) Comparison S316 Low BK 12,000 11,230 10,910 XR0900-01-3-S316-SS <6.62E-02 <DCGL S318 ALARM 12,000 12,140 8,680 XR0900-01-3-S318-SS <7.30E-02 <DCGL S319 ALARM 12,000 12,910 11,050 XR0900-01-3-S319-SS <6.38E-02 <DCGL S320 ALARM 12,000 12,920 11,070 XRO900-01-3-S320-SS <5.47E-02 <DCGL S321 ALARM 12,000 13,150 11,260 XR0900-01-3-S321 -SS <6.23E-02 <DCGL S322 ALARM 13,000 13,040 10,900 XR0900-01-3-S322-SS <5.88E-02 <DCGL S327 ALARM 13,000 13,060 10,230 XRO900-01-3-S327-SS 1.37E-01 +/- 3.43E-02 <DCGL S328 ALARM 13,000 13,330 11,000 XR0900-01-3-S328-SS <6.31 E-02 <DCGL S332 ALARM 13,000 13,500 11,310 XR0900-01-3-S332-SS <5.95E-02 <DCGL S333 ALARM 13,000 13,100 11,150 XRO900-01-3-S333-SS <6.31 E-02 <DCGL S337 ALARM 14,200 14,690 11,330 XRO900-01-3-S337-SS <5.96E-02 <DCGL S357 ALARM 12,000 12.050 9,200 XR0900-01-3-S357-SS <4.83E-02 <DCGL (ISOCS XRO900-01-3-S357-GS-XOOI <4.72E-01 <DCGL investigation XRO900-01 S357-GS-X002 <5.08E-0 I <DCGL XRO900-01-3-S357-GS-X003 <4.55E-01 <DCGL S358 ALARM 12,000 12,400 11,480 XRO900-01-3-S358-SS <5.42E-02 <DCGL S359 ALARM 12,000 12,000 9,200 XR0900-01-3-S359-SS <5.06E-02 <DCGL (ISOCS XRO900-01-3-S3 59-GS-XOO I <4.37E-0I <DCGL investigation XRO900-01 S359-GS-X002 <4.63 E-0 I <DCGL XR0900-01-3-S359-GS-X003 <4.40E-0 I <DCGL S374 ALARM 12,000 12,080 9,270 XRO900-01-3-S374-SS <5.32E-02 <DCGL (ISOCS XRO900-01-3-S374-GS-XOOI <5.OOE-0 I <DCGL investigation XRO900-01-3-S374-GS-X002 <4.78E-01 <DCGL XRO900-01 S374-GS-X003 <4.66E-0 I <DCGL S383 ALARM 12,000 12,030 8,830 XRO900-01-3-S383-SS <4.73E-02 <DCGL (ISOCS XRO900-01 S383-GS-XOO I <4.58E-0 I <DCGL investigation XRO900-01 S383-GS-X002 <4.37E-0 1 <DCGL XR0900-01-3-S383-GS-X003 <5.OOE-0 I <DCGL S394 ALARM 14,200 14,350 12,570 XRO900-01-3-S394-SS <2.65E-02 <DCGL S396 ALARM 14,200 14,160 12,470 XRO900-01-3-S396-SS <2.83E-02 <DCGL FR-0900-01, Revision 0 Page 25 of 31

FSS SURVEY RESULTS INVESTIGATION RESULTS Alarm Scan Scaler CS-137 DCGL Grid Reason Setpoint Measurement Measurement Sample ID (pCi/g) Comparison

__ _ __ __ _ _ _ _ _ (cp m) (cp m ) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

S404 ALARM 14,200 15,040 ' 13,860 XR0900-01-3-S404-SS 4.70E-01 +/- 4.23E-02 <DCGL S405 ALARM 14,200 14,960 11,990 XR0900-01-3-S405-SS 2.90E-01

• 3.15E-02 <DCGL SU Mean / DCGL 0.048

_ Total 0.048 NOTES: 1. "<" indicates value less than MDA, MDA value is reported.

2. The samples were also analyzed for Co-60; all were less than an MDA of 0.1 pCi/g.

FR-0900-01, Revision 0 Page 26 of 31

Attachment 4 Statistical Data FR-0900-01, Revision 0 Page 27 of 31

Survey Package FRO900 Unit I Soil Sign Test Summary n%nput Bia,5;,;/;' a ues',ua >'ommbe6 sgW-k5,v<

Survey Package: FR0900 BOP Land Area Survey Unit: 01 Evaluator: DR DCGL,: 4.20E+00 DCGL,.: 4.20E+00 LBGR: 2.76E+00 Sigma: 4.80E-01 Type I error: 0.05 Type II error: 0.05 Nuclide: CS-1 37 Soil Type: N/A Cal eatedVa s,,-,--. IC 1.645 Z1-P 1.645 Sign p: 0.99865 Calculated Relative Shift: 3.0 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift is >3 N-Value: 11 N-Value+20%: . 14 Number of Samples: 19 Median: 5.74E-02 Mean: 2.03E-01 Net Sample Standard Deviation: 3.96E-01 Total Standard Deviation: 3.96E-01 SRSS Maximum: 1.70E+00 Adjusted N Value: 19 S+ Value: ': 19 Critical Value: ' 13 Sign test results: Pass, Sufficient samples collected: Pass Maximum value <DCGL,: Pass Median value <DCGL,: Pass Mean value <DCGL ,, Pass Maximum value <DCGL,,: Pass Total Standard Deviation <=Sigma: ,- Pass Criteria comparison results: , - Pass T u ,ui psw a cnt P ______x_ _-_ _l The survey unit passes all conditions:lI ,' Passl FRO900-SU1-SflSign 2/11/05 12:45 PM FR-0900-01, Revision 0 Page 28 of 31

FR-0900 SU-1 Quantile Plot 1.8 1.6 -t.

1.4 0~

1.2 0

?9 0 I.

1 -.4-

• Activity (pCi/g)

" 2 0.8 -Median (pCi/g)

CED 0

C., 0.6 0.4 0.2

• . . * * +

• IV yr 'w* * . .

0 0 25 50 75 100 Percent

One-Sample T-Test Report Page/Date/Time 2 2/15/05 3:55:27 PM Database C:\Program Files\NCSS97\FRO900 SU-1.S0 Variable C2 Plots Section Histogram of FR-0900, SU-1 20 (I)

0) 15 E

co

!.i';

o 10

'a

-D .. r E

z 6.606 0.500 1.000 i.o6 . . .6oo Activity (pCilg)

FR-0900-0 1, Revision 0 Page 30 of 31

One-Sample T-Test Power Analysis Page/Date/Time 2 2/17/05 9:56:35 AM Chart Section Retrospective Power Curve 1.0-0.8-(D 0.6 I.. -! - - - - - - .- - - -- _.__

• I 0

0M 0.4

I \ I 0.2-. - -

• 0.0 0 - A Survey Unit Mean (pCi/g)

FR-0900-01, Revision 0 Page 31 of 31