ML043500239
| ML043500239 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 12/07/2004 |
| From: | Donna Anderson, Shaun Anderson, Broutigom T Maine Yankee Atomic Power Co |
| To: | NRC/FSME |
| References | |
| FA-0100-01, Rev 0 | |
| Download: ML043500239 (31) | |
Text
t v 'It-MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FA-0100 CONTAINMENT BUILDING SURVEY UNIT 1 Prepared By:
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MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FA-0100 CONTAINMENT BUILDING SURVEY UNIT I A. SURVEY UNIT DESCRIPTION Survey Unit 1 is located in Survey Area FA 0100, the Containment Building interior. The Containment Building is located in the restricted area between the Fuel Building and the Spray Building centered at site coordinates 407,575 N and 623,810 E. The Containment Building is shown in relation to other major site structures in map PA 0100. All maps referenced in this release record are provided in Attachment 1, unless othervise noted.
Survey Unit I consisted of the surface of the interior walls (steel liner) from El. -4 feet to approximately El. 17 feet. The physical configuration of Survey Unit I in relation to the remaining survey units in the Containment Building is provided in map FA 0100-UNITS (Attachment 1).
The survey unit has a surface area of approximately 858.4 m2.
B. SURVEY UNIT DESIGN INFORMATION The survey unit was known to have been contaminated to levels in excess of the release limits and required an extensive remediation effort prior to FSS. Given the high probability of residual contamination, the area was designated a Class I survey unit per the LTP.
The survey unit design parameters are shown in Table ]. Given a relative shift of 1.3, it was determined that 21 direct measurements were required for the Sign Test. Each sample location was determined using a fixed square grid with a random start point. These locations are presented on survey map FA0 100-U I-DIRECTS (Attachment 1). Once the direct readings were completed, removable contamination samples were obtained at each measurement location.
A 100% scan coverage of the area was required. The survey was designed to include 444 scan grids of approximately 2 m2 each. Instrument scan setpoints were conservatively set below the DCGLENIC, as shown in Table 2-2 (Attachment 2). The location of the scan grids is shown on maps FA 0100-UI-A through FA 0100-UI-H and FA 0100-UI-GH (Attachment 1).
To accommodate measurement geometry requirements for surfaces of non-uniform smoothness (including junctures), the SHP-360 and 43-68 probes were used to augment the scan survey. First, a 43-37 scan was performed on all surfaces, including those unlikely to meet geometry requirements for that model of probe. Then a repeat scan, using the SHP-360, was performed on areas with surface irregularities that required a smaller probe size. Ninety-degree surface junctures (i.e., wall-wall) were scanned using the 43-68 probe. Wall to floor junctures within the Containment liner were 45-degree angles and did not require special survey measures. As part of the Asbestos Abatement Project during early phases of decommissioning, lockdown was applied to the liner walls above El. -2 feet. All instrument efficiencies were reduced to account for the potential that some lockdown remained on the walls following Containment demolition and remediation activities.
FA-O100-Ol, Revision 0 Page 2 of 31
Background values were established for each particular instrument probe application based on ambient background values in the survey unit. No material backgrounds were included because of the minor background contribution from bare steel. The background values, listed in Table 1, were used to establish net activity for direct measurements, scan investigation levels, and to confirm the scan MDCs used were appropriate.
The instruments used in this survey unit 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 also compared to the DCGL, the investigation level, and the DCGLEN1c. As shown in this table, the scan MDC is less than the investigation criteria in all cases, thus providing high confidence (95%
or higher) that an elevated area would be detected in the scanning process. Since the investigation level at the alarm setpoint was always less than the design DCGLENtC, no EMC sample size adjustment was necessary.
TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria J Basis Area 858.4 m:
Section 5, LT1, Class I (Reference I)
Number of Direct 21 Based on an LBGR of 9,000 Measurements Required dpm/100 cm2, sigma' of 6,853 dpm/100 cm2, and a relative shift of 1.3.
Type I = Type II = 0.05 Sample Area 40.88 m 858.4 m' /21 samplesL Sample Grid Spacing 6.39 m (40.88)1"2 Scan Grid Area 2 m2 Area Factor 1.2 50 m2 / 40.88 m' per LIlP, Revision 3 Scan Area 858.4 m2 Class I - 100%
Background
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43-68 Direct and Scan 918 dpm/I00 cm2 Ambient only, efficiency reduced (flat surfaces) 2_for lockdowvn coating SHP-360 Scan 1,343 dpm100 cm' Ambient only, efficiency reduced (surface irregularities) for lockdown coating 43-68 Junctures 2,167 dpm/I00 cm2 Ambient only, efficiency reduced for lockdown coating 43-37 Scans 477 dpmn100 cm Ambient only, efficiency reduced for lockdown coating Scan Investigation Level DCGL plus background See Table 2-2 (Attachment 2)
DCGL 18,000 dpmI100 cm LTP, Rev. 3 (Reference I)
Design DCGLENIC 21,600 dpm/100 cm-LTP, Rev. 3 (Reference 1) 2 From LTP Revision 3, Table 5-1 A for Containment El. -2 fi., AO 100.
This survey unit was initially designed for N=21 samples. The N=21 design led to a survey unit map with 24 locations on the systematic grid.
FA-OO0-Ol, Revision 0 Page 3 of 31
C. SURVEY RESULTS Twenty-four direct measurements were made in Survey Unit 1. All direct measurements were less than the DCGL. Direct measurement data are presented in Table 2.
Scanning resulted in 27 verified alarms. Twenty-six alarms occurred while scanning flat surfaces with the 43-37 probe. One alarm was verified while scanning irregular surfaces with the SHP-360. In addition, one juncture survey was investigated based on professional judgment and one 43-37 flat survey (Ml58) was evaluated for a discrepancy in the data. The subsequent investigation work is discussed in the following section.
TABLE 2 DIRECT MEASUREMENTS Gross Activi' Net Activity Sample Location ltdpm00 cm (Table 1 Background Subtracted)
_0__
dpm /100 cm 2 FAOl00-1-M001 4,592 3,674 FA0100-1-M002 1,088 170 FA0100-1-M003 1,300 382 FA0100-1-M004 714
-204 FA0100-1-M005 964 46 FA0100-1-M006 1,240 322 FA0100-1-M007 2,177 1,259 FA0100-1-M008 877
-41 FA0100-1-M009 1,194 276 FAOI00-1-M010 1,039 121 FAOI00-1-MO1 1 1,217 299 FA0100-1-M012 1,852 934 FA0100-1-M013 1,081 163 FA0100-1-M014 1,334 416 FAO100-1-M015 1,799 881 FA0100-1-M016 2,143 1,225 FA0100-1-M017 1,485 567 FA0100-1-M018 1,447 529 FA0100-1-M019 1,988 1,070 FA0100-1-M020 2,094 1,176 FA0100-1-M021 1,066 148 FA0100-1-M022 1,032 114 FA0100-1-M023 926 8
FA0100-1-M024 1,655 737 Sample Mean 1,513 595 Median 1,270 352 Standard Deviation 785 785 Sample Range 714 - 4,592
-204 -3,674 FA-0100-OI, Revision 0 Page 4 of31
D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS The scan process identified 27 locations of potentially elevated activity. An investigation was performed for each location, plus one additional grid based on professional judgment, using survey investigation package XA0IOO-01. Also, the data for grid Cl58 was evaluated and included with the investigation results. The investigation results and assessment 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 range, are provided in Table 2. The direct measurements were all below the DCGL without subtracting background. The maximum result, with background subtracted, is equivalent to 3,674 dpm/ I00 cm2. When adjusted for background (ambient background subtracted), the mean residual contamination level is 595 dpm/l 00 cm2. For a DCGL of 18,000 dpm/l 00 cm2, this is equivalent to an annual dose rate of 0.01 mrem/y.3 The 29 grids of potential elevated activity were investigated and/or evaluated as shown in Table 3-1 of Attachment 3 and determined to be approximately 10% of the Elevated Measurement Comparison unity limit, thereby satisfying the EMC criterion.
F. ADDITIONAL DATA EVALUATION provides additional data evaluation associated with Survey Unit 1, 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 shown in the table, all of the key release criteria were clearly satisfied for FSS of this survey unit.
- 2. The Quantile Plot was generated from direct measurement data listed in Table 2 and indicates general symmetry about the median. The data set and plot are consistent with expectations for a Class I survey unit. There is no reason to conclude that the data set represents other than random variations in a Class I basement survey unit. It also should be noted that the maximum net activity (3,674 dpm/I00 cm2 at location MOOI) is well below the DCGL of 18,000 dpm/1 00 cm2.
IThis annual dose equivalent is based on LTP Table 6-1 1 which shows the contaminated concrete dose contribution (for surfaces contaminated at the DCGL) to be 0.301 mrem/y.
FA-O100-O1, Revision 0 Page 5 of 31
- 3. A histogram plot was also developed on the direct measurement values. This plot shows that the direct data were essentially a log-normal distribution with one outlier.
- 4. A Retrospective Power Curve was constructed based on FSS results. The curve shows that the 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.
As mentioned in Section B, removable contamination samples were obtained at each (direct) measurement location. In that this survey unit involved a (backfilled) basement and not a standing building, the removable contamination measurements were not applicable to release decisions for the survey unit. However, the samples were obtained and evaluated, indicating less than MDA values for alpha (i.e., < 4.7 dpm.l 00 cm2) and beta activity equal to a maximum of 18 dpmll 00 cm2. Thus, in comparison with the mean survey unit net activity (Table 2), the removable contamination sampling effort indicated that the majority of activity is fixed.
G. CHANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON EXTENT OF RESIDUAL ACTIVITY The survey was designed as a Class I area; the results were consistent with that classification. The post-remediation direct measurement sample standard deviation was less than the design sigma. Thus, a sufficient number of sample measurements were taken.
I1. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit I was designed and performed using the criteria of the approved LTP Revision 3 Addenda (Reference 1, 2, 3) and the license amendment for activated concrete (Reference 4).
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, all beta direct measurements were less than the DCGL of 18,000 dpm/100 cm2.
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 were 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-normal distribution, with variance consistent with expectations for a Class I survey unit.
FA-O100-01, Revision 0 Page 6 of 31
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. Attachment 3 shows the areas identified by verified alarms and provides the results of the investigation actions. The areas under investigation were evaluated using the appropriate area factor. The survey unit was determined to satisfy the elevated measurement comparison unity rule per the LTP methodology.
In addition, while not part of the release decision criteria, removable contamination sampling confirmed that the majority of remaining activity in this basement survey unit was fixed.
It is concluded that FAOI00 Survey Unit I meets the release criteria of IOCFR20.1402 and the State of Maine enhanced criteria.
J. REFERENCES
- 1. Maine Yankee License Termination Plan, Revision 3, October 15, 2002
- 2. Maine Yankee letter to the NRC, MN-02-061, dated November 26, 2002
- 3. NRC letter to Maine Yankee, dated February 28, 2003
- 4. Maine Yankee letter to NRC, MN-03-049, dated September 11, 2003 FA-OI00-01, Revision 0 Page 7 of 31
Attachment I Survey Unit Maps FA-OIOO.-OI, Revision 0 Page 8 of 31
Maine Yankee i liilaie~ciiiisiiit~-jc~t-~jF I-iiMpD:FO Decommissioning Team MAine Yankee Decommissioning Project Survey Frm M I
Survey Type:
= Characterization Turnover
- Final Status Survey Survey Area Name: Reactor Containment Building Note: Grid based on Maine State Coordinate System (West Zone) NAD 1927 623.000 E 623,500 E 624,000 E 624,500 E 625.000 E Survey Area: FA0100 MN 3/
N FA-0I00-01, Revision 0 Page9of31
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Survey Unit Instrumentation FA-O100-01, Revision 0 Page21 of 31
TABLE 2-1 INSTRUMENT INFORMATION E-600 S/N l
Probe SIN (type) 2617 190752 (43-37) 1625 190329 (43-37) 2488 190327 (43-37) 1933 190750 (43-37) 2489 190751 (43-37) 1606 190285 (43-37)-
2621 190669 (43-37) 1648 168748 (43-37) 1928 190283 (43-37) 1929 148952 (43-37) 1648 148952 (43-37) 1933 455 (SHP-360) 2618 453 (SHP-360) 1645 453 (SHP-360) 1933 464 (SHP-360) 2488 148938 (43-68) 1933 148937 (43-68) 1648 148937 (43-68) 1648 148932 (43-68) 1933 149075 (43-68) 1625 149069 (43-68)
TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DESIGN DCGLEMIC 1 43-68 1
43-68 SHP-360
{
43-37 Detector Flats l
Junctures Surface Flats IrregularitiesI Scan MDC 1,134 2,676 3,209 2,006 (dpm/I00 cm2)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(dpm/lOO cm2) 18,000 18,000 18,000 18,000 Investigation Level 18,896 20,153 19,468 20,188 (Alarm Setpoint)
DCGL plusDCLpuDGLls DGLls dpm/100 cm2 BDCGL plus DCGL plus
- DCGL plus
Background
(Reference 2)
Background
Background
Background
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Design DCGLjC (dpm/100 cm) 21,600 21,600 21,600 21,600 (from RR Table 1)
NOTES:
- 1. Scan MDC from LTP Rev. 3, Table 5-6, was adjusted for a change in efficiency due to different materials and/or geometry.
- 2. Investigation level was calculated for only 126 cm2 of detection surface area.
FA-O100-01, Revision 0 Page 22 of 31 Investigation Table FA-OI00-01, Revision 0 Page 23 of 31
TABLE 3-1 INVESTIGATION TABLE Scan Alarm Scan Investigation DCGLENIC Comparison l Alarm Initial Scan Maximum Area Elevated Area DCGLEMC Elevated Area Grid No.
Setpoint Value ca er rea Factor EMC Activity Comparison (CPM)
(cpm)
Value (cm2)
(AF)6 (dpm/l00 cm2)
(dpm/lOO cm2)7 Factor M009 (43-37) 6,410 7,940 N/A N/A N/A N/A
< DCGL O.OOE+00 M086 (43-37) 6,410 12,130 16,350 50 10,000 1.80E+08 61,791 3.43E-04 M099 (43-37) 6,410 23,200 19,570 50 10,000 1.80E+08 73,961 4.11 E-04 M100 (43-37) 6,410 8,050 N/A N/A N/A N/A
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< DCGL O.OOE+00 M152 (43-37) 6,410 8,400 N/A N/A N/A N/A
< DCGL 0.00E+00 M158 (43-37) 6,410 6,690 6,690 20,000 25 4.50E+05 25,283 5.62E-02 M166 (43-37) 6,410 6,670 N/A N/A N/A N/A
< DCGL 0.OOE+00 M207 (43-37) 6,410 6,960 N/A N/A N/A N/A
< DCGL 0.OOE+00 4
Juncture, 43-37, and SHP-360 surveys were performed with alarm setpoints equal to 3600 cpm, 8800 cpm, and 1000 cpm, respectively. All data was evaluated with the lower setpoints shown in this table.
5 Scan alarms occurring with the 43-37 were investigated with the 43-68 detector. All 43-37 alarm grids were rescanned with a 43-68 probe and an alarm setpoint of 5000 cpm. Values shown as N/A indicate peak hold readings during the 43-68 scan that were below the investigation level.
6 For investigation purposes, consistent with LTP dose modeling for basement concrete surfaces and LTP Section 6.8.1, a conservative area factor was determined by the formula of AF = 50 m2/actual size of the elevated area.
As an additional conservatism, the background and survey unit mean activity have not been subtracted in calculating the elevated area activity.
FA-0100-0, Revision 0 Page 24 of 31
Scan Alarm Scan Investigation DCGLEMC Comparison Alarm Initial Scan Maximum Area Elevated Area DCGLEMC Scaler Area Ara DCGLE EeatdAra DCCM Elevated Area Grid No.
Setpoint Value (CM
- 2)
Factor CM2 Activity Comparison (CPM)
(cpm)
Value (AF)6 (dpm/100cm2)
(dpm/100 cm2)7 Factor (cp m )4
~~~(cpm )5 M264 (43-37) (Area 1) 6,410 10,750 5,360 200 2,500 4.50E+07 20,257 4.50E-04 M264 (43-37) (Area 2) 6,410 10,750 5,410 150 3,333 6.OOE+07 20,446 3.41 E-04 M266 (43.37) 6,410 14,290 N/A N/A N/A N/A
< DCGL O.OOE+00 M268 (43-37) 6,410 6,690 N/A N/A N/A N/A
< DCGL 0.OOE+00 M269 (43-37) (Area 1) 6,410 9,520 8,730 200 2,500 4.50E+07 32,993 7.33E-04 M269 (43-37) (Area 2) 6,410 9,520 2,590 35 N/A N/A
< DCGL O.OOE+00 M270 (43-37) 6,410 9,400 4,880 60 N/A N/A
< DCGL O.OOE+00 M274 (43-37) 6,410 6,780 N/A N/A N/A N/A
< DCGL 0.OOE+00 M275 (43-37) 6,410 11,500 N/A N/A N/A N/A
<DCGL O.OOE+00 M287 (43-37) 6,410 23,500 25,400 80 6,250 1.13E+08 95,994 8.53E-04 M318 (43-37) 6,410 12,650 N/A N/A N/A N/A
< DCGL O.OOE+00 M327 (43-37) 6,410 18,420 19,300 345 1,449 2.61 E+07 72,940 2.80E-03 M327 (SHP-360) (Area 1) 580 889 593 50 10,000 1.80E+08 19,905 1.1I E-04 (SHP-360)
M327 (SHP-360) (Area 2) 580 889 845 480 1,042 1.88E+07 28,363 1.51 E-03 (SHP-360)
FA-0 100-01, Revision O Page 25 of 31
Scan Alarm Scan Investigation DCGLEMC Comparison Alarm Initial Scan Maximum Area Elevated Area DCGLEMC ElvtdAe rdN.
Setpoint Value Sclr Ae Factor DCGLEMC Activity Comparison Elevated Area Grid No.
(cpm)n (cpm)
Value (Cm 2)
(AF)6 (dpm/100 cm2)
(dpm/100 cm2)7 Factor M332 (43-37) (Area 1) 6,410 11,150 9,270 300 1,667 3.OOE+07 35,034 1.17E-03 M332 (43-37) (Area 2) 6,410 11,150 3,670 80 N/A N/A
< DCGL O.OOE+00 M333 (43-37) 6,410 15,730 N/A N/A N/A N/A
< DCGL 0.OOE+00 M334 (43-37) (Area 1) 6,410 16,040 8,200 400 1,250 2.25E+07 30,990 1.38E-03 M334 (43-37) (Area 2) 6,410 16,040 3,270 60 N/A N/A
< DCGL 0.OOE+00 M335 (43-37) 6,410 56,800 23,800 120 4,167 7.50E+07 89,947 1.20E-03 M341 (43-37) 6,410 9,170 1,340 1,380 N/A N/A
< DCGL 0.OOE+00 M354 (43-37) 6,410 129,200 N/A N/A N/A N/A
< DCGL O.OOE+00 M365 (43-37) 6,410 7,430 N/A N/A N/A N/A
< DCGL 0.OOE+00 M381 (43 Juncture) 2,260 547 356 N/A N/A N/A
< DCGL O.OOE+00 M389 (43-37) 6,410 6,750 N/A N/A N/A N/A
< DCGL 0.OOE+00 Survey Unit Remainder N/A N/A N/A N/A N/A DCGL Survey Unit 3.31 E-02 18,000 Mean = 595
_T o ta l l.O IE -0 I FA-000-01, Revision 0 Page 26 of 31 Statistical Data FA-O100-01, Revision 0 Page 27 of 31
Survey Package FA-0100 Unit 1 Surface Sign Test Summary
.y-
~
- Ž
-4 V->
~ Co..nt Survey Package:
FA-0100 Containment Bid Survey Unit:
01 Evaluator:
GP DCGL,:
18,000 DCGLerrc:
21,600 LBGR:
9,000 Sigma:
6,853 Type I error:
0.05 Type II error:
0.05 Total Instrument Efficiency:
21.0%
Detector Area (cm2):
126 Choosing 'N/A' sets material Material Type:
N/A background to "0" c
Comrrients~
- 'r' Zo
1.645 1.645 Sign p:
0.903199 Calculated Relative Shift:
1.3 Relative Shift Used:
1.3 Uses 3.0 if Relative Shift >3 N-Value:
17 N-Value+20%:
21
'.StaticData.alues.
S-:
X f@-c4.
Cormen sat s'.
Number of Samples:
24 Median:
352 Mean:
595 Net Static Data Standard Deviation:
784 Total Standard Deviation:
784 SRSS Maximum:
3,674 oItlrv1?vr+
<ig-nT esuft
- r.
,?'-b
,.¢;~jigt orrNil sa<h Adjusted N Value:
24 S+ Value:
24 Critical Value:
16 Crs-<S2literia S'atsfzcio ji
,S,,,t ornmo n
- srit, Sufficient samples collected:
Pass Maximum value <DCGLv,:
Pass Median value <DCGL,:
Pass Mean value <DCGL,:
Pass Maximum value <DCGL,,,:
Pass Total Standard Deviation <=Sigma: :
Pass Sign test results:
'Pass The survey unit passes all conditions:l Pass_
FA-0100-SUI-SurfaceSign FA-0100-01, Revision 0 11/22104 10:38AM Page 28 of 31
FA-0100 SU-1 Quantile Plot J 0 0
0 x:
To c~JE 0
0 No N-'
4000 3500 3000 2500 2000 1500 1000 500 0
-500 1*
1-
- Activity (dpm/100 cm2)
Median (dpm/100 cm2) 1*
,~ ~
,A 25 50 75 11 Percent
Page/Date/Time Database Variable One-Sample T-Test Report 2
11/22/04 10:16:50 AM C:\\Program Files\\NCSS97\\FA0100SU-1.S0 C2 Plots Section Histogram of FA-O100, SU-1 15.000-U)
.Ž 11.250-
- 0.
E Id 7.500-E z
3.750-A n 77=7
, " 7,.f
'Y
'. j "'
T -
.1.,
.ti, - -
I._.'
:.I-
. I rf_-I
- 000o 00 62S000 l1750.00 2875.000
- 406.000 Activity (dpml100 cm2)
FA-0I00-O1, Revision 0 Page 30 of 31
Page/Date/Time Chart Section L_
a) 0 1.0-0.8 0.6-0.4 0.2 0.0 L0 One-Sample T-Test Power Analysis 2
11/22/04 10:17:55AM Retrospective Power Curve I
- -\\
-~~~~~
I
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I
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I I
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I
-I I
I I
500 600 15600 Survey Unit Mean (dpm/100 cm2) 20600 FA-0100-01, Revision 0 Page31 of 31