ML043640203

Maine Yankee Final Status Survey Release Record FB-1700 Staff Building Basement Survey Unit 1

ML043640203
Person / Time
Site:	Maine Yankee
Issue date:	12/22/2004
From:	Cooper W J, Litton V, Olsen C A, Pillsbury G Maine Yankee Atomic Power Co
To:	NRC/FSME
References
MN-04-060, RA-04-118 FB-1700-01, Rev 0
Download: ML043640203 (30)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FB-1700 STAFF BUILDING BASEMENT SURVEY UNIT I Prepared By: CA Date: _______FSS ngineer- nature AA O(sen Printed Name Reviewed By: e~- AE / O Date: / / ; 4 FSS Spjeciqlist

-Signature Printed Name Reviewed By_ _ ___ Date: l -/Indepepdent Review -Signature Approved By: /C.. Date: Z ctel intend pt-gnature Printed Name /Approved By: ,f C -/lU- Date: 4y~/s4 FSS, MOP- Signature PJr int Nam Printed Name Revision 0 MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FB-1700 STAFF BUILDING BASEMENT SURVEY UNIT I A. SURVEY UNIT DESCRIPTION Survey unit I is located in Survey Area FB 1700 in the Staff Building basement.

The survey area is located in the basement of the former Staff Building at coordinates 407,885N &624,078E using the Maine State Coordinate System (West Zone) NAD 1927. The Staff Building is shown in relation to other major site structures in map FBI700 SITE. All maps referenced in this release record are provided in Attachment 1 unless otherwise noted.Survey Unit I of FBI700 consists of the concrete floor and three concrete walls of the basement which will remain following demolition of the Staff Building.

Earlier in the decommissioning program, floor carpeting was removed from the building and the floors were painted. Vinyl tiles in the hallways and ceramic tiles in the restrooms were removed during building interior demolition.

The survey unit is approximately 1670 in 2.Remaining wall and floor surfaces of the Staff Building are concrete, including up to approximately 2.75m of wall surfaces on three sides of the basement floor.B. SURVEY UNIT DESIGN INFORMATION The Historical Site Assessment classified the survey unit as Class 3 per the LTP Revision 3.The survey unit is shown on the maps in Attachment

1. The basement was completely outside the Restricted Area during plant operations and decommissioning.

During plant operation, the Staff Building was used as office space. During decommissioning activities, several storage areas within the Staff Building housed sealed radioactive sources used for instrumentation, gamma spectroscopy and the Whole Body Counter. The current source inventory confirmed that nonexempt sources were stored within the building.

The Chemistry Count Room, which was located in the Staff Building during decommissioning, analyzed and stored gamma cross check samples (liquid form) not listed on the radioactive source inventory.

The samples were prepared in the decon sink in the RP access trailer and transferred to the Count Room after sealing.During the latter part of the decommissioning, the Whole Body Counter was moved from the 3 rd floor of the Staff Building to the basement.

Personnel believed to have received any internal deposition of radionuclides were required by procedure to obtain whole body counts.Showers associated with Whole Body Counting were performed in the Locker Rooms, which are in this survey unit, during the same time frame. (Personnel using these showers had already passed the portal monitors.

They may have had extremely low level external contamination, usually naturally occurring radioactive materials, which had to be washed off in order to get a valid Whole Body Count.)FB-1700-01, Revision 0 Page 2 of 30 The survey unit design parameters are shown in Table 1. Given a relative shift of 3.0, it was determined that 14 direct measurements were required.

Each sample measurement location was determined using a Random Direct Point Location Determination method. These locations are presented on Direct Point Reference Map FBI 700 DP REF.A 1% to 10% scan coverage is required for Class 3 areas. To meet this requirement 211 scan grids of approximately I m 2 were incorporated into the design. The total scan area was approximately 211 m or 13%.of the survey unit were surveyed.

Scan grids and their location are shown on Maps FB 1700-I a through I e. In addition three biased scans in the shower and utility drains were included as shown on Map FB1700-1k and were each much less than 1 m 2 in area.To accommodate measurement geometry requirements for surfaces of non-uniform smoothness, the SHP-360 probe was used to augment the 43-68 or 43-37 scan surveys. First, a 43-68 or 43-37 scan was performed on all surfaces, including those that were 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.The instruments used in this survey are listed by model and serial number in Attachment 2 in Table 2-1. Scan MDCs are also listed in Table 2-2 of Attachment 2, and are compared to the DCGL and the investigation level. As shown in this table, the scan MDC is less than the scan investigation level in all cases, thus providing high confidence (95% or higher) that an elevated area would be detected in the scanning process. Actual background measurements were consistent with design backgrounds used to determine the instrument scan MDC values listed in LTP Table 5-6.Background values were established for the scan measurements based on local values in the survey unit and previously established material background.

These background values listed in Table I were used to establish alarm setpoints, to confirm that the scan MDCs used were appropriate and to establish net activity for direct measurements.

Instrument scan setpoints were set at the DCGL plus background.

FB-1700-01, Revision 0 Page 3 of 30 TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria Basis Area 1670 m' Survey Maps Based on an adjusted LBGR of N.e o16,878 dpm/O00 cm 2.Sigma'Number of Direct 14 374 dpm/I00 cm 2.Measurements Relative shift = 3.Type I = Type 11 = 0.05.Sample Area N/A Class 3 Sample Grid Spacing N/A Class 3 Scan Grid Area I m Area Factor N/A Class 3 Area Scan Survey Area 211 m' (13%) Class 3 Area: 1% -10%.B ackground

_ __ _ _ ___________________________

43-68 Direct and Scan (flat concrete surfaces) 3681 Ambient and Material dpm/l Oo cm 2 43-37 Scan (all flat surfaces) 2473 Ambient only dpm/I00 cm 2 SHP-360 Scan (Surface Irregularities) 10088 Ambient and Material dpm/I00 cm SHP-360 Scan (Drains) dpm/100 cm2 2770 Ambient only Scan Investigation Level DCGL plus ScanInvestigationLevelbackground See Table 2-2 (Attachment 2)DCGL dpm/I00 cm2 18,000 References 2 and 3 Design DCGLENIC N/A Class 3 Area C. SURVEY RESULTS Fourteen direct measurements were made in Survey Unit 1. All direct measurements were less than 50% of the DCGL. The resulting data are presented in Table 2 below.No 43-68 or 43-37 scan alarms were encountered while surveying flat surfaces.

Four verified alarms were received during the scans of irregular surfaces using the SHP-360. No alarms occurred while surveying the drains with the SHP-360. The investigation of verified alarms is discussed below.Design sigma is based on LTP Table 5-lB, Staff Building, B1700, (LTP, Rev. 3).FB-1700-01, Revision 0 Page 4 of 30 TABLE 2 DIRECT MEASUREMENTS Sample Location Gross Activity (Table 1 Background Subtracted dpm/100 crn2 FBI 1700-1-COO1 4090 409 FBI 1700-1 -C002 3626 -55 FBI1700-1-C003 4127 446 FBI 1700-1 -C004 4206 525 FB1700-1-C005 4182 501 FB1700-1-C006 4225 544 FB1700-1-C007 4237 556 FBI 1700-1 -C008 4493 812 FB1 700-1 -C009 4475 794 FBI1700-1-CO10 3926 245 FBI1700-1-COII 4615 934 FBI1700-1-C012 4219 538 FBI1700-1-C013 3718 37 FBI700-1-CO14 3950 269 Mean 4149 468 Median 4194 513 Standard Deviation 280 280 Range 3626 to 4615 -55 to 934 D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS The SI-IP-360 surface scan identified four locations of potentially elevated activity at Grids C179, C184, C188 and C198. An investigation was conducted via survey investigation package XB1700-01.

The investigation consisted of a scan of each of the four grids followed by a direct scaler measurement at the highest location scanned. One of the investigation scans exceeded the alarm setpoint, at Grid C1 79, whereas all of the direct measurements were significantly less than 50% of the DCGL. A follow-up volumetric sample was obtained at Grid 179. The absence of plant related activity was verified by the isotopic analysis.Investigation results are summarized in the Investigation Table in Attachment 3.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. Without subtracting background, all direct measurement results were below 50% of the DCGL. The maximum direct sample result with background subtracted was equivalent to 934 dpm/lOOcm 2.When adjusted for background, the mean residual contamination level is 468 dpm/lOOcm 2 , equivalent to an annual dose of 0.008 mrem 2.2 This 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 mremfy.FB-1700-01, Revision 0 Page 5 of 30 F. ADDITIONAL DATA EVALUATION Attachment 4 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 is shown in the table, all of the key release criteria were satisfied for the FSS of the 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 3 survey unit. It also should be noted that the maximum net activity of 934 dprn/l 00 cm 2 was well below 50% of the DCGL which is 9,000 dpm/l00 2 cm 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.

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.During the performance of the 43-68 direct measurement surveys, it was noted that two locations contained glue residue from the floor tiles. Volumetric samples were obtained at these locations (C003 and C009) to validate the 43-68 data. The results of the gamma spectroscopy showed no plant-derived activity in the volumetric samples.G. CIIANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON 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, a sufficient number of sample measurements were taken.FB-1700-01, Revision 0 Page 6 of 30 H1. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit I was designed and performed during September through November 2004 using the criteria of the approved LTP Revision 3 with Addenda. There have been no subsequent LTP changes with potential to impact this FSS.1. CONCLUSION The FSS of this survey unit wvas designed based on the LTP designation as a Class 3 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 50% of the DCGL or 9,000 dpm/IO00 2 cm .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 variance consistent with expectations for a Class 3 survey unit.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. Scanning resulted in four verified alarms for evaluation.

The investigation showed that all direct measurements were significantly less than 50% of the DCGL and the one follow-up isotopic analysis confirmed no plant-derived radioactivity.

It is concluded that FBI700 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, Maine Yankee letter to the NRC, MN-02-048, October 15, 2002 2. Maine Yankee License Termination Plan, Revision 3 Addenda, Maine Yankee letter to the NRC, MN-02-061, November 26,2002 3. NRC letter to Maine Yankee, February 28, 2003 4. Maine Yankee letter to the NRC, MN-03-049, September 11, 2003 (LTP Supplement to LTP Revision 3)5. Issuance of License Amendment No. 170, NRC letter to Maine Yankee, dated February 18, 2004 FB-1700-01, Revision 0 Page 7 of 30 Attachment I Survey Unit Maps FB-1700-01, Revision 0 Page 8 of 30 i i w I-9)LLC CLo-C* O*0~6n-a-C* -0 0 0 0 0 SJ 4 O 0 0 Co a 0 Co)04.0 0D 0 0 0.0 0 0 0 0 0 0 0 0 0 O (A CoO ol O 0 aO 0 O 0 (A 0 0 C._m C)E cz Co=3 C)M t2)0 U)2 U)E M (n_>1 Co a)C?I U)Q>a)0 , I..C)0 cn N C.)-c 0.I I a5 C)U)623.000 E 623.500 E 624. 000 E 624,078 E 624.500 E 0 c 0._A._ o-0 o t CD CZ-A a, a, CD c co a,.C a E a)cn 0)C 0.E 0 a, 0-I X-625. 5,000 E-626, 000 E Note: Grid based on Maine State Coordinate System (West Zone) NAD 1927 SURVEY AREA, FB 1700 South East Corner of Staff Building at Coordinate

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Maine Yankee Map ID #: FB1700-1b Decommissioning Team Maine Yankee Decommissioning Project Sur'ey Formt Date: 9116/04 Survey Type: O Characterization G Turnover 1 Final Status Survey Survey Area Name: Staff Building Final Status Survey FB 1700: Staff Building First Floor (El. 22')Survey Scans 001-013, 036-053, 162-176 II H i.* 1.I 1 0521 0531 .05 10501.10481 0491.-+-1 0471 0461 .1044 10451 .17611751 17411731172 F-+--1 F-+-+ +-+-_10431 042i. 116711681 16911701171 N .1 0401 041 1 I 1661165I16411631162 r T -+ 0 L --n to .L- L-..l 8 l ° l g l l 8 ib l g 0361 0371 ° ° ° ° ° °L_1_1_1__1J5_

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Maine Yankee .I Map ID #: FB1700-1c Decommissioning Team Maine Yankee Decommissioning Project Survey Form Date: 9/16/04 Survey Type: Cl Characterization O Turnover rg Final Status Survey Survey Area Name: Staff Building Final Status Survey FB1700: Staff Building First Floor Survey Scans 014-035, 096-127, (El. 22')177-211 D D LI r T-r --r -11231124112511261 11221121112011271

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+/-.- .L- ..L- L ..L-'BlilU... .. .. ... .....A-... .LI t D-m-i > \lTotal Area = 1670 sq-rn (inc. walls)Im .,I Et FB-1700-01, Revision 0 Page 13 of 30 All Survey Scans are 1m Maine Yankee Map ID #: FB1700-1d Decommissioning Team I Maine Yankee Decommissioning Project Survey Form IDate: 9116/04 Survey Type: O Characterization El Turnover X Final Status Survey Survey Area Name: Staff Building FB1 700: Final Status Survey Staff Building First Floor (El. 22')Survey Scans 054-095 YD---) \S.d 4 4a. .. .e *I 0941 095 F -+- --1 0931 0921 I nlOf MbI I-....: W ' .* .-: I W.L..-108910881 1 0861 0871 1 0851 0841 1 0821 0831 I 1 0811 0801 1 07810791-+ -.A 1 0771 0761 F -+ --107410751 1 0731 0721 1 0701 0711 1 0691 0681 1 0661 0671 1 0651 0641 1 0621 0631 1--+--l 1 0611 0601 1 0561 0571 0581 0591 1 0551 0541 L=, I7 a I'Ej All Survey Scans are 1mr x 1mr.FB-1700-01, Revision 0 Page 14 of 30 Total Area = 1670 sq-m (inc. walls)

Maine Yankee I Map ID #: FB1700-1e Decommissioning Team Aiaine Yankee Decommissioning Project Survey FormI Date: 9/16/04 Survey Type: O Characterization O Turnover X Final Status Survey iSurvey Area Name: Staff Building Final Status Survey FB1700: Staff Building First Floor (El. 22')Survey Scans 128-161.>-- -\11 H 4 .*.I * .-L-i* , I I * .*.*4. ".('I 116111601 115811591 115711561 L <=J_-I 1 15511541 ,L,+ _ -115211531 115111501 F -+ -d 114811491 ,L._+ _ -114711461 F -+ -d 11441 1451 114311421 114011411 1- -+ -113911381 13611371 113511341 113211331 ,L._+ _ -113111301 ,L _+ _ -112811291 L -I J D D_ , a ...:.4 a I Eli FB-1700-01, Revision 0 1 Page 15 of 30 T ot -.A.e.. , ...,1 7 s -r n .a l Total Area = 1670 sq-m (inc. walls)All Survey Scans are 1 m x I m.

Maine Yankee Map ID #: FB1700-1f Decommissioning Team Maine Yankee Decommissioning Project Survey Form Date: 9/16/04 Survey Type: E Characterization M Turnover E Final Status Survey Survey Area Name: Staff Building Final Status Survey FB1700: Staff Building First Floor (El. 22')Direct Point 009>D--- \'a' , .Is .-.A .*:,-..'*

• ad V I.. .., ..n .,.4 4 LZ Do 11.50m 4.4..'.., 4 O ..:-4.88m W009 FB-1700-01, Revision 0 Page 16 of 30 Maine Yankee I I Map ID #: FPt1700-g Decommissioning Team Maine Yankee Decommissioning Project Sun'ey Form Date: 9116/04 Survey Type: O Characterization C Turnover S Final Status Survey I Survey Area Name: Staff Building Final Status Survey FBI700: Staff Building First Floor (El. 22')West Wall from qj C to Ck F, Direct Point 002 0.13m FB-1700-01, Revision 0 Page 17 of 30 Maine Yankee I Map ID#: FB1700-1h Decommissioning Team IMaine Yankee Decommissioning Project Sun'ey Form Date: 9/16104 Survey Type: 0 Characterization a Turnover X Final Status Survey ISurvey Area Name: Staff Building Final Status Survey FB1700: Staff Building First Floor (El. 22')Direct Points 001, 004, 005, 007, 012, 014 A9 4.50m 5.50m 0.75m --EZ[7.50m 004 11.50m 01-012 I 001.005Ji 3.00m 0 -5.00m 4 FB-1700-01, Revision 0 LII Page 18 of 30[

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rjc uvyD ID #: F131 700-1li Decommissioning Team Ilahze Yankee Decommissioning Project Sune Form DatPe: 9/16/04 Survey Type: CD Characterization E Turnover X. Final Status Survey FSurvey Area Name: Staff Building Final Status Survey FB1700: Staff Building First Floor (El. 22')Direct Points 006, 008, 010 FB-1700-01, Revision 0 Page 19 of 30 I1 I Maine Yankee Map ID#: FB1 700-Dj Decommissioning Team Maine Yankee Decommissioning Project Su'ey Form IDate: 9116/04 Survey Type: O Characterization 3 Turnover 1 Final Status Survey lSurvey Area Name: Staff Building Final Status Survey FB1 700: Staff Building First Floor (El. 22')Direct Points 003, 011, 013 I , v .. ..,. .. .. ..1 .!l ;l.El A7 a.1 0I 0.50m-K 5.00m Om 4.00m I r- -...A. .a Vault 1 013 4 L"--- 4.25m -003 l 0.75m 2.75m I FB-1700-01, Revision 0 Page 20 of 30:g} D \

Maine Yankee Map ID #: FB1700-1k Decommissioning Team Maine Yankee Decommissioning Project Survey Fornm' Date: 10/20/04 Survey Type: E Characterization E Turnover X Final Status Survey Survey Area Name: Staff Building Final Status Survey FB1700: Staff Building First Floor (El. 22')Survey Scans M212 -M214 4I. _ _ip'.4 ., 4 .M212 ___, 3" 0Metal Pipe.. :. ..3 .M. .a .1 M23- J .s 214_ ; A 3"0 [Metal Pipe© ©' a v L_ _ ll l (Revision 0 Attachment 2 Survey Unit Instrumentation FB-1700-01, Revision 0 Page 22 of 30 TABLE 2-1 INSTRUMENT INFORMATION E-600 S/N Probe SIN (type)1928 190285 (43-37)1625 148937 (43-68)2617 467 (SH-IP-360) 1645 148939 (43-68)l1625 149069 (43-68)_ _1648 190327 (43-37)2619 190329 (43-37)2489460 (SHP-360)l1641 190750 (43-37)__2488 462 (SHP-360)l2489 462 (SHP-360)HPGe Detectors (for Laboratory Analysis of Volumetric Samples)TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, AND INVESTIGATION LEVEL 438 4337 SIH-360 SIIP-360 Detector (Concr[tc) (Concrete) (irregular (Metal I Cnrt)Surfaces)

Pnetrations)

Scan MDC 1,832 3,663 10,484 4,140 (dpm/1 00 cm 2) (Note 1) (Note 1) (Note 1) (Note 2)(dpm/lO cm 2) 18,000 18,000 18,000 18,000 Scan Investigation 21,680 20,470 20,770 Level baCkgrouns DCGL plus (- DCGL plus (dlamlO cmpon) background) (Nkgoten3) background) background)

NOTES 1. LTP Table 5-6 2. The SHP-360 scan MDC from LTP Table 5-6 was adjusted to account for a change in efficiency due to geometry and material.3. The 43-37 investigation level was determined for 100 cm 2 of detection surface area.FB-1700-01, Revision 0 Page 23 of 30 Attachment 3 Investigation Table FB-1700-01, Revision 0 Page 24 of 30 TABLE 3-1 INVESTIGATION TABLE SCAN ALARM SCAN INVESTIGATION Scan Percent of Grid No. Alarm Alarm Gross Net 3 Scaler Net Scaler DCGL of Setpoint Value Scaler (dpm/100 18,000 (Instrument (cpm) (cpm) (cpm) (cpm) cm 2) dpmlI 00 Used) cm 2 C179(SHP-360) 255 342 104 12 1,315 7.3%C 184 (SHP-360) 255 322 92 0 0 0 C188 (SHP-360) 255 301 89 329 0 C198 (SHP-360) 255 291 101 9 987 5.5%3 The Table I background

(= 92 cpm) was subtracted from the gross scaler reading.FB-1700-01, Revision 0 Page 25 of 30 Attachment 4 Statistical Data FB-1700-01, Revision 0 Page 26 of 30 SIGN TEST

SUMMARY

Survey Package FB1700 Survey Unit: 01 Evaluator:

AO DCGLw: 18,00C dpm/1 OOcm 2 DCGLec: __n/a LBGR: 16878 dpm/l OOcm 2 Sigma: 374 dpm/l OOcm 2 Type I error: 0.0-Type II error: 0.0 Total Instrument Efficiency:

13.0%°Detector Area (cm 2): 126 Concrete Material Type: Painted.Calcu atedva ues C- .',i ,o,,ie -,.,.: Z,--4 1.645 Zi.-:. .1.645 Sign p: 0.99865 Calculated Relative Shift: 3.Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%:

14 Number of Samples: 14 Median: 514 dpm/1 OOcm 2 Mean: 469 dpm/1 OOcm 2 Net Static Data Standard Deviation:

280 dpm/1 OOcm 2 Total Standard Deviation:

351 SRSS of samples and all background Maximum: -935 dpm/1 OOcm 2 Adjusted N Value: 14 S+ Value: 14 Critical Value: 1C__Sufficient samples collected:

Pass Maximum value <DCGL,: Pass Median value <DCGLW: Pass Mean value <DCGLW SPass Maximum value <DCGLe,,,_:

.'Pass Total Standard Deviation

<=Sigma: .Pass Sign test results: - Pass txii~fj t-6It *;Final Statuksi 2i' ;. 'The survey unit passes all conditions:l Pass_FB-1700-01, Revision 0 Page 27 of 30 FB1700 SU.1 Quantile Plot V-4 0: 00 *O ;*o <: 0.E ca)0 Q 0 ft-f 0.*._'I-1000 800 600 400 200 0-200 A 4 *4 4 4 4 4 I hn w%.# w I %J Percent L Activity (dpm/100cm2) -Median (dpm/100cm2)]

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_.__ .. .....I One-Sample T-Test Report Page/Date/Time Database Variable 2 12/9/04 1:05:20 PM C2 Plots Section Histogram of FB-1700, SU-1 0 C,.0 E z Activity (dpmI DO cm2)FB-1700-01, Revision 0 Page 29 of 30 One-Sample T-Test Power Analysis Page/Date/Time 2 12/9/04 1:06:32 PM Chart Section QL 0 a-1.0- 4 0.8-0.6-0.4 0.2 0.0 I 0 Retrospective Power Curve..;- -5000 10600 15600 Survey Unit Mean (dpm/100 cm2)20600 FB-1700-01, Revision 0 Page 30 of 30