ML043500279

Final Status Survey Release Record FR-0110-01, Rev 0, Pab Alleyway Survey Unit 1.

ML043500279
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-0110-01, Rev 0
Download: ML043500279 (22)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0110 PAB ALLEYWAY SURVEY UNIT 1 Revision 0

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0110 PAB ALLEYWAY SURVEY UNIT I A. SURVEY UNIT DESCRIPTION Survey Unit FR-0l 10-01 is an excavated area that consists of soil media and rock ledge. 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 0110-00, Attachment 1.

The Alleyway was a paved area within the restricted area, bordered on the wvest by the Personnel Hatch, Main Steam Valve House, Electrical Penetration Room, and the Emergency Feedwater Pump Room buildings, by the Service Building on the east, and by the PAB on the north. The survey unit is approximately 130 m2 .

B. SURVEY UNIT DESIGN INFORMATION The area was designated a Class I land survey unit per the LTP (Table 5-1 C - 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 both to improve the area factor and because additional sample points fell within the area when the locations were laid out. Thirty-three direct measurements were actually performed. Measurement locations were randomly determnined, using a fixed grid with a randomly determined start point, and are illustrated on the map FR 0110-SS-01 (Attachment 1). All direct measurements consisted of soil or ledge samples obtained at the required locations. The samples were analyzed with laboratory gamma spectroscopy.

Twenty-four scan grids of from 1.7 m2 to 7.4 m2 were established, as indicated on survey map FR 01 10-01. A 100% scan coverage of the area was required. The survey instruments used, their MDCs, and alarm setpoints, are provided in Attachment 2. The design DCGLENIC is greater than the investigation level; therefore, no EMC sample size adjust is required.

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.

FR-01 10-01, Revision 0 Page 2 of 22

TABLE 1 SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria Basis 2

Area 130 l <Class 1 limit per LTP Area__130____Revision 3 Based on an LBGR of' 1.6 pCi/g, sigma of 1.33 pCi/g' Number of Direct 30 and a relative shift of 1.2, N Measurements Required was adjusted to increase the area factor.

Type I =Type II = 0.05 Sample Area 4.3m 4 130 m/ 30 Sample Grid Spacing 2mx2m L=2m Scan Grid Area Variable (1.7 m2 - 7.4 m2 <10 m 2 Area Factor 3 (conservative) LTP Revision 3, Table 6-12

-Scan Survey Area 130 m' Class 1 Area- 100%

Background . __________________________

SSPA-3 (scan) Average background DI 6-150, LTP Section5

+ 1000 c/rnI615,LPSeto Scan Investigation Level 3 sigma of background EC-009-0 1 (MY).

__________________plus BKG. See Table 2-2 (Reference 1)

DCGL 3.2 pCi/g22 LTP, Rev 3 3,and (Reference 4, Addenda and 5)

Design DCGLEMC 9.6 Area factor

• DCGLvw C. SURVEY RESULTS As required, 33 direct soil measurements were made and the results are presented in Table 2.

Three of the direct measurements were above the DCGL unity fraction. The maximum direct result was 1.57 times the DCGL unity fraction and the mean residual activity is 40% of the unity fraction.

A discussion of the investigation performed in the survey unit is contained in Section D. Of the 24 grids, 16 required investigation either due to a low background at the start of the scan or because the scan setpoint was exceeded. Two of the grids were investigated because the initial scaler background measurements exceeded the alarm setpoint.

It should be noted that the Co-60 DCGL of 0.86 pCi/g 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 (References 5 and 6). The Co-60 DCGL for surface soil is I pCi/g x 10/6.58 mremly (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 LTP Rev 3 Table 5-1C for ROIOO, RCA Yard West.

2 Design initially used a DCGL of 3.2 pCi/g (Cs-137). The Cs-137 DCGL was later reduced to 2.39 pCilg (Reference 5)

FR-0 I 0-0 1, Revision 0 Page 3 of 22

TABLE 2 DIRECT MEASUREMENTS SampleINumbcr Co-60 (PCi/g) Cs-137 IUnccrtaint (pCi/g) .ei Uncertainty Unitized of Unity Value Rule FRO I0-0I-SOOI1 1.22E-01 2.55E-02 1.51E-O 1 3.16E-02 0.21 FROI 10-01-S002 4.51E-02 1.68E-02 6.07E-02 2.06E-02 0.08 FROI 10-01-S003 1.23E-01 2.33E-02 1.27E-01 3.34E-02 0.20 FROI 10-01-S004_O 2.14E-01 2.65E-02 2.08E-01 3.49E-02 0.34 FRO I0-0I-SOO55 2.19E-01 2.77E-02 2.43E-01 3.66E-02 0.36 FROI 10-01-S006 6.29E-02 2.26E-02 6.30E-02 2.10E-02 0.10 FROI 10-0I-S007 1.25E-01 2.32E-02 1.27E-01 3.16E-02 0.20 FROI 10-01-S008 6.37E-02 2.10E-02 1.05E-01 2.50E-02 0.12 FROI 10-01-SOO9 1.06E-01 2.15E-02 1.61E-01 3.31E-02 0.19 FROIIO-0I-ROIO <1.30E-01 <I.OOE-OI 0.19 FROI IO-OI-SOII 2.19E-01 2.58E-02 1.15E-01 2.58E-02 0.30 FROI1O-O1-SO12 1.80E-01 2.65E-02 2.15E-01 3.41E-02 0.30 FROI 10-01-S013 1.49E-01 2.39E-02 1.80E-01 3.01E-02 0.25 FRO] 10-01-S014 5.17E-01 4.19E-02 2.96E-01 4.1OE-02 0.73 FROl IO-OI-S015 2.85E-01 3.03E-02 5.10E-01 5.07E-02 0.54 FROI 10-01-S016 4.07E-01 3.61E-02 5.57E-01 5.88E-02 0.71 FROI 10-01-S017 2.50E-01 2.90E-02 1.83E-01 3.03E-02 0.37 FROI 10-01-S018 1.98E-01 2.39E-02 5.05E-01 4.85E-02 0.44 FRO] 10-01-SO19 8.91E-01 6.07E-02 1.13E+00 9.84E-02 1.51 FROI 10-01-S020 1.07E+00 6.19E-02 7.68E-01 6.65E-02 1.57 FROI 10-01-S021 2.91E-01 3.29E-02 1.71E-01 3.51E-02 0.41 FROI 10-01-S022 3.06E-01 3.OOE-02 2.38E-01 3.53E-02 0.46 FROI 10-01-S023 1.59E-01 2.48E-02 3.57E-01 4.39E-02 0.33 FROI 10-01-S024 8.65E-01 5.30E-02 8.71E-01 7.16E-02 1.37 FRO 1O0-0I-R025 <.I IE-01 <9.54E-02 0.17 FROI 10-01-R026 <1.04E-01 <8.35E-02 0.16 FROI 10-01-R027 <1.18E-01 <1.03E-01 0.18 FROI 10-01-R028 <1.29E-01 <1.20E-01 0.20 FROI10-01-R029 <1.28E-01 <1.15E-01 0.20 FROII0-0I-R030 <1.15E-01 <1.04E-01 0.18 FROII0-01-R031 <1.31E-01 <1.15E-01 0.20 FROI 10-01-S032 3.43E-01 3.69E-02 2.58E-01 4.16E-02 0.51 FROI 10-01-R033 <1.03E-01 <9.93E3-02 0.16 Mean 2.511E-0I 2.59E-0_I 0.40 Median 1.49E-01 1.611E-01 0.25 Standard Deviation 2.4613-01 2.5213-01 0.38 Range 0.045 to 1.07 0.061 to 1.13 0.078 to 1.57

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

FR-OI 10-01, Revision 0 Page 4 of 22

D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS Survey Unit 1 was partitioned into 24 grids as shown on map FR 0110-01 (Attachment 1).

Of the 24 grids, 16 required investigation either due to a low background at the start of the scan or because the scan setpoint was exceeded. Two of the grids were investigated because the initial scaler background exceeded the alarm setpoint. Three direct measurements exceeded the DCGL. Two of these were in grids that were investigated as noted above. The third was not investigated because there was no scan alarm, and has been included in the Elevated Measurement Comparison (Table 3-1).

Investigation of the scan grids consisted of a 100% scan with the SSPA-3. The highest reading in the grid was flagged and a soil or rock sample was collected for laboratory gamma analysis. The results of the investigations are shown in Attachment 3. Detectable concentrations of Co-60 and Cs-137 were found in seven of the investigated grids with one sample activity exceeding the DCGL. Samples from the other investigated grids did not show positive Co-60 or Cs-1 37, and so, for purposes of the EMC test, were assumed to be present at the observed MDA. 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, are provided in Table 2. Of the 33 soil/rock samples, three had concentrations of Co-60 and Cs-137 that exceeded unity. The average of the DCGL unity fractions was 0.40 and the maximum unity fraction was 1.57 times the DCGL.

The Elevated Measurement Comparison unity test was applied to the investigation data and conservatively includes one direct sample that was in a grid that was not investigated. The EMC test was 83% 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 (0.259 pCi/g). The result is a net value of 0.069 pCi/g. When the survey unit mean for Co-60 (0.251 pCi/g) is included, this would equate to an annual dose rate of 1.8 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 Annual dose rate = [(0.251/0.86) + (0.069/2.39)] x 5.63 mremly for soil.

FR-01 10-01, Revision 0 Page 5 of 22

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. All of the key release criteria were 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 1 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- 137 respectively.

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 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 1 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 same three direct samples would still be above unity with the previous, higher DCGLs.

The MDA for volumetric samples was listed as 0.05 pCi/g in the survey instructions. This MDA was not met for rock samples. However, the rock sample data were evaluated at their stated MDA and found acceptable.

FR-OI 10-01, Revision 0 Page 6 of 22

l-. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 1 was designed and performed per the criteria of LTP Revision 3 with Addenda (Reference 3 and 4). The subsequent LTP change with potential impact to this FSS requiring evaluation was the LTP change related to the activated concrete license amendment (Reference 5 and 6) which reduced the DCGLs for soil inside the RA.

This change was 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.

1. 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.

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 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. Verified alarms were investigated and the survey unit meets the Elevated Measurement Comparison unity rule per LTP methodology.

It is concluded that FROI 10 Survey Unit 1 meets the release criteria of IOCFR20.1402 and the State of Maine enhanced criteria.

FR-0 1I0-01, Revision 0 Page 7 of 22

J. REFERENCES

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 the NRC, MN-02-048, dated October 15, 2002

4. Maine Yankee License Termination Plan, Revision 3 Addenda, Maine Yankee letter to the 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-01 10-01, Revision 0 Page 8 of 22

Attachment 1 Survey Unit Maps FR-OI I0-01, Revision 0 Page 9 of 22

Maine Yankee Afaite Jatike DecoitniiissioiihgMap ID#: FR 01m0-00 Decommissioning Team I I Survey Type: D Characterization J Turnover X Final Status Survey Survey Area Name: Alleyway Excavation Date: 6-25-03 FOXBIRD ISLAND POINT624.500 E

,VVFPG BA 625.000 E o

C) 0 Q 0n

-) z0 0z

0) 0 o0 0. 0~ 0 0 oD a 0 0 0 0 Z Z Z Z Z Z SCALE <f t)

MN 0 400 800 1200 L-- 3~~ N FR-01 10-01, Revision 0 Page 10 of 22

Final Status Survey Unit Reference Map Alleyway Piping Excavation Pit Containment MsVH Slab

rr (V) 9 FR 011 0-01: Alleyway Piping Excavation Pit C 0

.; N 9

0)

Vertical Ledge & Adjacent Soil Survey Scan 01 -24 - -

0 N a} o 0 0

N -. +-- - 0Q 9

C Cd 0

0 m CO o

E 05 04 03 02 1 01 I z 07 06 It2

-rn 0

14 13 12 11 10 09 08 LEDGE - 234-Q)

U, I:

I- ,~ 20 - 21 22 18

>1 Ct 4t, uz to

. U, EX LL C

0 Q

Q 13 X

riU) 0 E _I .

I-- I 2 C

9X LEDGE 16 17 18 19 20 20 ,

2 21 1 22 1 23 I 24 I 04 0 8 ELEV.  ! iI I 0 C

0 0

c-C N

.r0) 0 (U e

(U 0

E Q.

• O Ca V) 0 5m lom 15m 2:

o This survey area unt Is app hnately 130 squam nsten

FR 01 10-SS-01, Direct Point Soil Survey 0

Survey Unit 01 Reference 0 Alleyway Piping Excavation Pit

(N LL.I Ledge Wall & Adjacent Soil o 0

N 0L P.:

a

-- 2 S3n 2 00m I 2 o0 r: TY P.

F 0.62ni

-U r- 1.42m 0 09 0 08 0 07 006 005 004 003 0 02 0-011 0 10 .. -11 0 12. --- -. *- 13

• 14 0 15 0 16 j 0 17 0 18 0 -1

-a .... , . - .. , . 1;,j;,_.

I--

E

.E E

I.0 9 - .vl h I"u- * )9f 9 n ... . _.-..J

_I .

I_1 C J I l0.66m -J 8 026 0 27 0 28 0 29 0 30 0 31 0 32 0*33-O ..

.o *

,Y .

P I Ct i--:'8in- j  ;:n l-

't a)a 3

ci, C

L2.0, N=30 L=2.0, N30 survey area This survey This area unit unit is approximately 130 is approximately square meters 130 square meters

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

TABLE 2-1 INSTRUMENT INFORMATION E-600 SIN I ProbeS/N (type) 1927 725890 (SSPA-3) 2489 726560 (SSPA-3) 1929 725328 (SSPA-3) 2491 725328 (SSPA-3) 1929 725890 (SSPA-3)

IIPGe Detectors for Lab Analysis of Volumetric Samples I

Detector Number I MDC (PCi/g)

FSS-1 0.04 - 0.10 FSS-2 0.04 - 0.10 DET2 0.10 (nominal)

DET3 0.10 (nominal)

TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DCGLEMC Detector SSPA-3 Comments Scan MDC 5.9 Design Scan MDC, (pCi/g) LTP Table 5-6 (Reference 3)

DCGL 2.39 (Cs-137) Reference 5 (pCi/g) 0.86 (Co-60)

Investigation Level 3 sigma of Background (Alarn Setpoint) 16,980 to 22,700 plus Background cpm ._ ._ (o6)_CL__F(40asprornd Design DCGLEMC 9.6 (Cs-137) DCGL

• AF (4.0 as performed)

(pCi/g) 3.4 (Co-60)

FR-0 I 10-0 1, Revision 0 Page 15 of 22

Attachment 3 Investigation Table FR-O1 10-01, Revision 0 Page 16 of 22

TABLE 3-1 INVESTIGATION TABLE INITIAL SURVEY J INVESTIGATION RESULTS Alarm Alarm Mx Grid DCGL Emc Grid Setpoint Value Scan Area Area DCGity Sample Number Co-60 Cs-137 cpm cpm cpm m Times AF (pCi/g) (pCilg) Unity cpm _ _ _ _ _ _ _ _

S004 17310 lb 15790 5.4 3.5 3.5 XROI I 0-0I-SOOI SS 1.15E-01 2.24E-02 6.88E-02 12.58E-02 <DCGL S009 16980 17030 16790 7.4 2.9 2.9 XROI 10-01-SO02SS 2.11E-01 2.52E-02 7.48E-02 [2.39E-02 <DCGL SOIO 16980 17960 15780 7.4 2.9 2.9 XRO I I 0-01 -S008SS 4.37E-02 4.54E-02 <DCGL S012 16980 17080 17220 7.4 2.9 2.9 XRO I I 0-0 I-SOO7SS 1.69E-01 2.26E-02 l.99E-01 2.95E-02 <DCGL S013 16980 17580 17150 7.4 2.9 2.9 XROI 0-0OI-SO06SS 1.77E-01 2.63E-02 3.68E-01 4.25E-02 <DCGL S014 16980 17190 16800 3.7 4.5 4.5 XROI 10-01-SO05SS 1.09E-01 1.97E-02 1.93E-01 3.12E-02 <DCGL SOIS 22700 lb 24400 1.7 8.4 8.4 XRO I IO-O I-S009SS < 4.18E-02 < 4.30E-02 <DCGL S016 22700 lb 21900 3.4 4.9 4.9 XRO I10-01-RO07RS < 1.13E-01 < 9.86E-02 <DCGL S017 22700 lb. 24400 3.4 4.9 4.9 XROI 10-01-RO06RS < 8.98E-02 < 7.90E-02 <DCGL S018 I 22700 hb 24500 3.4 4.9 4.9 XRO I 0-0 I-ROO5RS < 1.27E-01 < 1.16E-01 <DCGL SO19 22700 lb 26000 3.4 4.9 4.9 XROI 10-01-RO04RS < I.IOE-01 < 8.38E-02 <DCGL S020 22700 lb 23300 3.4 4.9 4.9 XROI 10-01-RO03RS < 1.20E-01 < LOOE-01 <DCGL S021 22700 lb 21700 3.4 4.9 4.9 XROI 10-01-RO02RS < 8.45E-02 < 7.20E-02 <DCGL S022 22700 lb 23100 3.4 4.9 4.9 XROI IO-I0-ROOIRS < I.05E-01 < 1.02E-01 <DCGL S023 22700 lb 18040 3.4 4.9 4.9 XRO I I0-0 I-SO04SS 8.15E-01 5.24E-02 6,52E-01 6.JOE-02 0.19 S024 17310 hb 18270 3.4 4.9 4.9 XRO I I0-0 -S003 SS 2.63E-01 2.9 1E-02 3.08E-01 3.73E-02 <DCGL SOO1* 5.4 3.5 3.5 FROI 10-01-SO19 8.91E-OI 6.07E-02 1.13E+00 9.84E-02 0.35 Unit mean 1.82E-01 1.92E-01 0.29

=___

=_ _ EMC Unity Sum 0.83

"<"indicates values less than the minimum detectable activity (MDA) lb - investigated due to low background in the grid hb - investigated due to high background in the grid

• - SOOI is the value from the direct sampling, included because the direct value was >DCGL but there was no alarm in the grid FR-0 I10-01, Revision 0 Page 17 of 22

Attachment 4 Statistical Data FR-O1 10-01, Revision 0 Page 18 of 22

Survey Package FRO110 Unit I UNITY Soil Sign Test Summary Survey Package: FRO110 Survey Unit: 01 Evaluator: WJC DCGL,: 1.OOE+00 unity DCGL,: 3.OOE+O0 LBGR: 5.00E-01 Sigma: 3.83E-01 unity - actual SU Std Dev & 2.39 DCGL Type I error: 0.05 Type II error: 0.05 Nuclide: UNITY Soil Type: NIA 1.645 1.645 Sign p: 0.903199 Calculated Relative Shift: 1.3 use 2.39 pCi/g DCGL Relative Shift Used: - 1.3 Uses 3.0 if Relative Shift is >3 N-Value: 17 N-Value+20%: 21 Dt V&6 es -.. Coment ¶VIAA, Number of Samples: 33 Median: 2.49E-01 Mean: 4.OOE-01 Net Sample Standard Deviation: 3.83E-01 Total Standard Deviation: 3.83E-01 Sum of samples and reference Maximum:. -1.57E+00

- -T *---. X.-. .

Adjusted NValue: 33 S+ Value:. 30 Critical Value: - ' 21 Sign test results:1  :,..' Pass

,-.4K~~t;3 s^i ;-T4,>Ci ea Satlsacti'odB-an. a -'-!ts,'*.3.->n e ,S 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: .K Investigate See sec E of the Release Record

, S tc .n- .,.

The survey unit passes all conditions: - ' Investigate SU-1 Passes FRO1 10-Sul-SoilSign-UNITY~xs FR-0I 10-01, Revision 0 1211/04 6:23 AM Page 19 of 22

FR-011O SU-1 Quantile Plot 1.800 -f 1.600 -t_

1.400 0)

-r N

._ 1.200 4-.

0o C 1.000

• Activity (unitized)j 0 :

t'J <

C 4-0.800 - Median (unitized) l a>

.) _ . ,. .. ..

t' C 0.600 0.400 p

0.200 0.000 0 25 50 75 100 Percent

One-Sample T-Test Report Page/Date/Time 2 12/2/04 8:04:09 AM Database C:\Program Files\NCSS97\FR01 10 SU-1.S0 Variable C2 Plots Section Histogram of FR-01IO, SU-1 20 O'

E4 CD

'5O 15 I

77 o 10 E

z) 5

"-I've

- "F n 0.0 0'5' ' ' ' -'0 '1.5' 2.0 Activity (unitized)

FR-0I 10-01, Revision 0 Page 21 of 22

One-Sample T-Test Power Analysis Page/Date/Time 2 12/2/04 7:57:07 AM Chart Section Retrospective Power Curve

\ * . .

I I I I

• _I. I .

0~

iI I \' '

I  ! \

Survey Unit Mean (unitized)

FR-OI 10-0 1, Revision 0 Page 22 of 22