ML050590048

Final Status Survey Release Record FD-0700 Fire Protection (Water) Survey Unit 1

ML050590048
Person / Time
Site:	Maine Yankee
Issue date:	02/17/2005
From:	Donna Anderson, Packer J, Pillsbury G, Tozzie R Maine Yankee Atomic Power Co
To:	Document Control Desk, NRC/FSME
References
FD-0700-01, Rev 0
Download: ML050590048 (27)

Text

i MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FD-0700 FIRE PROTECTION (WATER)

SURVEY UNIT 1 Prepared By: Date: - )

StSgnature Printed Name/

Reviewed By: Date: olo/o FSS SpeApvdyDt Sz 7o2l-Printed Name Independent Revew-Sgature Reviewed By: ;P20LQ6?LoO Date: allolos5 Independent Review - Signature By Approved ~e~ ate:Vo e Arintedename~ur Approved By: hi. 2 tDate: t//

FSS-, MOP - Signature' Printed Name Revision 0

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FD-0700 FIRE PROTECTION (WATER)

SURVEY UNIT I A. SURVEY UNIT DESCRIPTION Survey Unit FD-0700 Survey Unit l, Fire Protection (Water), consists of the 12" diameter ring header that provided water to the fire protection system within the Protected Area of the site. Survey Unit 1 is located within grid coordinates 407,300 to 408,300 N and 623,600 to 624,300 E using the Maine State Coordinate System (West Zone), NAD 1927.

The survey unit area is shown in relation to other major site structures in map FD 0700-1 SITE and FD0700-1 REF. All maps referenced in this release record are provided in Attachment I, unless otherwise noted. The survey unit total internal surface area is approximately 961 m2 .

B. SURVEY UNIT DESIGN INFORMATION The Fire Protection pipes are generally located 6 to 10 feet below grade. Due to personnel safety concerns, sections of the piping system were removed from the excavations such that the pipes could be surveyed in a safe location. A total of five pipe sections, each approximately 2 meters long, were removed from the system. Refer to map FDO700-01 REF for locations where pipe sections vere obtained. Refer to maps FDO700-la through -le for the actual lengths of the pipe segments.

The area was designated a Class 3 buried pipe survey unit per the LTP (Table 5-IE). 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 for the Sign Test, however the LTP required 30 direct measurements for FD-0700. Measurement locations are illustrated on maps FD 0700-1f through-Ij. All direct measurements consisted of one-minute beta counts obtained at the required locations.

Scan grids were each approximately I m2 as indicated on survey maps FD 0700-1 a through -

le. A 1% to 10% scan coverage of the area was required. The scan grids provided a total scan area of approximately 10 in2 , exceeding the 1% requirement. The survey instruments used, their MDCs, and alarm setpoints are provided in Attachment 2. The scan MDC was less than the investigation level thereby providing high confidence that areas of elevated activity would be identified.

Background values were established for the scan measurements based on local scaler values taken in the area where the surveys were performed. These background values were used to establish scan alarm setpoints and to confirm the scan MDCs used were appropriate.

FD-0700-01, Revision 0 Page 2 of 27

TABLE 1 SURVEY UNIT DESIGN PARAMETERS Survey Unit J Design Criteria l Basis Area 961 m2 No limit for Class 3 Area Number of Direct 30 Based on Att. SA of the LTP.

Measurements Required Type I = Type II= 0.05 Sample Area N/A Class 3 Area Sample Grid Spacing N/A Class 3 Area Scan Grid Area Approximately I M2 Class 3 Area Area Factor N/A Class 3 Area Scan Survey Area Approximately 10 m2 Class 3 Area 1% - 10%

Background .'ggSig^ , A lX;^ .;,..8..§ 43-68 (scan) 774 dpm/100 cm2 Ambient Background Scan Investigation Level 0.5 DCGL plus Background See Table 2-2 DCGL 9800 dpm/100 cm 2 LTP Revision 3 (Reference 2 and 3)

Design DCGLEMc N/A Class 3 Area C. SURVEY RESULTS As required, 30 direct measurements wvere made and the results are presented in Table 2. All direct measurements were below the DCGL. No verified alarms were received during the pipe scans. Therefore, no investigations were required.

FD-0700-01, Revision 0 Page 3 of 27

TABLE 2 DIRECT MEASUREMENTS Sample Number l Gross (dpm/100 cm 22) Net (dpm/100 cm2 )

FD-0700-01-P001 979 205 FD-0700-01-P002 850 76 FD-0700-01-P003 827 53 FD-0700-01-P004 860 86 FD-0700-01-P005 678 -96 FD-0700-01-P006 721 -53 FD-0700-01-P007 899 126 FD-0700-01-P008 780 7 FD-0700-01-P009 761 -13 FD-0700-01-P010 847 73 FD-0700-01-P0I 1 579 -195 FD-0700-01-P012 678 -96 FD-0700-01-P013 989 215 FD-0700-01-P014 767 -7 FD-0700-01-P015 817 43 FD-0700-01-P016 807 33 FD-0700-01-P017 724 -50 FD-0700-01-P018 685 -89 FD-0700-01-P019 817 43 FD-0700-01-P020 708 -66 FD-0700-01-P021 688 -86 FD-0700-01-P022 906 132 FD-0700-01-P023 833 60 FD-0700-01-P024 853 79 FD-0700-01-P025 830 56 FD-0700-01-P026 754 -20 FD-0700-01-P027 701 -73 FD-0700-01-P028 896 122 FD-0700-01-P029 751 -23 FD-0700-01-P030 651 -122 Mean 788 14 Median 794 20 Standard Deviation 97 97 Range 579-989 -195-215 D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS The pipe scan identified no verified alarm locations.

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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. Both the mean and median activities were less than the DCGL of 9800 dpm/l 00 cm2 . The maximum direct measurement result with background subtracted was less than 3% of the DCGL. No additional investigations or any reclassification was required.

For illustrative purposes, as indicated in LTP Section 5.9.3, a simplified general retrospective dose estimate can be calculated from the average net residual contamination level. The result is a net activity value of 14 dpm/l 00 cm 2 . This would equate to an annual dose rate of 3.6E-6 mrem/y.' 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 direct measurement values.

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. As is shown in the table, the final sigma was less than the design value. In addition, the Sign Test and all release criteria were clearly satisfied.

The direct measurement total standard deviation at 103 dpmll 00 cm2 was less than the design sigma. As required by the LTP, 30 direct measurements were performed. Since this is greater than the relative shift-calculated N, there is no affect on the result.

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 well below the DCGL of 9800 dpm/l 00 cm2 .

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 no 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.

Annual dose rate = 14/9800 x 2.52E-3 mrem/y.

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G. C-IANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON TIlE 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 total standard deviation was less than the design sigma, therefore a sufficient number of sample measurements were taken.

H. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit I was designed, performed and evaluated in late 2004 to early 2005.

The design was performed to the criteria of the LTP, Revision 3 (Reference 4). No subsequent LTP changes with potential impact to this survey unit needed to be evaluated.

I. CONCLUSION The FSS of this survey unit was 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 in accordance with the LTP. As presented in Table 2, all direct measurements were less than the DCGL of 9800 dpm/100 cm 2 .

A Sign Test Summary analysis demonstrated that the Sign Test criteria were satisfied. The direct measurement sigma was less than that used for design, so 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 no verified alarms for evaluation.

It is concluded that FD-0700 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

3. Maine Yankee letter to the NRC, MN-02-061, dated November 26, 2002

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

5. Approach for Dealing with Background Radioactivity for Maine Yankee Final Status Surveys, Attachment E to Maine Yankee Procedure PMP 6.7.8, FSS Data Processing and Reporting FD-0700-01, Revision 0 Page 6 of 27

Attachment 1 Survey Unit Maps FD-0700-01, Revision 0 Page 7 of 27

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Maine Yankee Map ID #: FDO700-1 REF Decommissioning Team Maine Yankee DeconnzissioningProjectSurvey Form Date: 2/16105 Survey Type: O Characterization O Turnover B Final Status Survey ISurvey Area Name: Underground Fire Protection Piping 2z Final Status Survey pE C dUl FDO700: Underground Fire Protection Piping U0 L E Excavation Location Reference ' L .° (X.N . o Cs 0.

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FD-0700-01, Revision 0 Page 10 of 27

Maine Yankee I Map ID#:FD 0700-l b Decommissioning Team lMaine Yankee DeconmmissioningProjectSurvey ornm IRevised 2116/05 Survey Type: O Characterization O Tumover O Final Status Survey ISurvey Area Name: Underground Fire Protection Piping Final Status Survey FDO700 Underground Fire Protection Piping, Location 2 Survey Scans P003- P004 Top of Pipe 14# (Position O0)

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Decommissioning Team IMaineYankeeDecomnnissioningProjectSurvetForml Revised 2116105 Survey Type: O Characterization O Turnover X Final Status Survey Survey Area Name: Underground Fire Protection Piping Final Status Survey FDO700 Underground Fire Protection Piping, Location 3 Survey Scans P005- P006 Top of Pipe

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, I~ I FD-0700-01, Revision 0 Page 12 of 27

Maine Yankee IMap IUI FD 0700-1d Decommissioning Team Maine Yankee DecommissioningProjectSurvey Bor I~

evised: 2/16/05 Survey Type: OCharacterzation OTumover O FinalStatusSurvey Survey Area Name: Underground Fire Protection Piping Final Status Survey FDO700 Underground Fire Protection Piping, Location 4 Survey Scans P007- P008 9

Top of Pipe (PositionO0) 7 rK PM, taxc FD-0700-01, Revision 0 Page 13 of 27

Decommissioning Team IMaine Yankee DecommissioningProjectSurv orm IRevised: 2/16/05 Survey Type: 0 Characterization l Turnover M-Final Status Survey Survey Area Name: Underground Fire Protection Piping Final Status Survey FDO700 Underground Fire Protection Piping, Location 5 Survey Scans P009- P010 Top of Pipe (Position 00)

FD-0700-01, Revision 0 Page 14 of 27

Maine Yankee rH I Map ID#:FLD 0701 Decommissioning Team IMaine Yankee DecommissioningProject Survey Form IRevised: 2/16/05 Survey Type: 0 Characterization O Turnover I FinalStatus Survey SurveyAreaName: UndergroundFireProtectionPiping Final Status Survey FDO700 Underground Fire Protection Piping, Location 1 Direct Points P001- P006 Top of Pipe

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FD-0700-01, Revision 0 Page 15 of 27

Maine Yankee Map ID#: FD 070(

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Maine Yankee Map ID#: FD 070 Decommissioning Team Maine Yankee DecommissioningProjectSurvey Fornt Revised: 2/16/05 Survey Type: 0 Characterization O Tumover 13FinalStatus SurveyI SurveyAreaName: UndergroundFireProtectionPiping Final Status Survey FDO700 Underground Fire Protection Piping, Location 3 Direct Points P013- P018 Top of Pipe

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Maine Yankee . Map ID#: FD 0700-1i Decommissioning Team Maine Yankee DecommissioningProjectSurvey' Form Revised: 2/16/05 Survey Type: O Characterization O Turnover W Final Status Survey Survey Area Name: Underground Fire Protection Piping Final Status Survey FDO700 Underground Fire Protection Piping, Location 4 Direct Points P019- P024 A -Top of Pipe lb (Position 0°)

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0.25m 36r 240 120- 0o Isometric View Flattened View Approximate Piping Section Location V-S#k I I It VrPM FD-0700-01, Revision 0 Page 18 of 27

Maine Yankee map IL)#: I'D 070J0-1j Decommissioning Team IMaine Yankee DecommissioningProjectSurvey Form IRevised: 2116105 Survey Type: C Characterization 0 Turnover WFinal Status Survey ISurvey Area Name: Underground Fire Protection Piping Final Status Survey FDO700 Underground Fire Protection Piping, Location 5 Direct Points P025- P030 Top of Pipe

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Attachment 2 Survey Unit Instrumentation FD-0700-01, Revision 0 Page 20 of 27

TABLE 2-1 INSTRUMENT INFORMATION E-600 S/N Probe SIN (type) 2489 177991 (43-68-5) l 1645 148939 (43-68)

TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, AND INVESTIGATION LEVEL Detector 43-68 Comments Design Scan MDC, Scan MDC 992 LTP Table 5-6 (Reference 2),

(dpm/100 cm2) adjusted for pipe geometry and metal efficiency.*

DCGL 9800 Approved DCGL (dpm/10 cm2 ) LTP Section 6.6.8 (Reference 2)

Investigation Level 0.5 DCGL plus Background, (Alarm Setpoint) 5675 EC-009-01 (Reference 1)

(dpm/100 cm2)

$ 1832 dpm/100 cm x (0.13/0.24) = 992 dpm/I00 cm 2 FD-0700-01, Revision 0 Page 21 of27

Attachment 3 Investigation Table (No Investigations Required)

FD-0700-01, Revision 0 Page 22 of 27

Attachment 4 Statistical Data FD-0700-0 1, Revision 0 Page 23 of 27

Survey Package FD-0700 Unit 1 Surface Sign Test Summary

,a -K7 l- iEvipu'tibn'lnH a u- omments I

Survey Package: FD.0700 Fire System Piping Survey Unit: 01 Evaluator GP DCGL,: 9,800 DCGLemc: N/A LBGR: 9.080 Sigma: 240 From GTS Site Characterization Rpt.

Type I error: - 0.-05 _.

Type IIerror: 0.05 Total Instrument Efficiency: 24.0% metal pipe Detector Area (cm2): 126 Choosing 'N/A sets material Material Type: N/A background to "0" Z1<--1.645 Z.P: -. ,,1.645 Sign p:- 0.99865 Calculated Relative Shift: - 3.0 Relative Shift Used: .:- 3.0 Uses 3.0 if Relative Shift >3 N-Value: ._-_ '.1_1 N-Value+20%: 4

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a r iS~etA3.i'.-"o'mmentsW L4 Number of Samples: 30 Median: ,.20 Mean: 14 Net Static Data Standard Deviation:

Total Standard Deviation: -103 SRSS Maximum  : - 215 ..

Adjusted N Value: . . _.>: _ _

S+ Value: '30C Critical Value: - - - 2 Sufficient samples collected:  ;:.:Pass Maximum value <DCGL.,: . ..Pass Median value <DCGL",: pFs .

Mean value <DCGL,: . Pass Maximum value <DCGLe=: A ) N/A for Class 3

,- Pass Total Standard Deviation <=Sigma: '.Pas__

Sign test results: _:_-_-_______

The survey unit passes all conditions: l PasUThe SU passes FD-0700-SUlI -SurfaceSign FD-0700-01, Revision 0 2/17105 9:05 AM Page 24 of 27

FD-0700 SU-1 Quantile Plot 250 200 E 150 V

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• Activity (dpm/1 00 cm2) w 0 E

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One-Sample T-Test Report Page/Date/Time 2 2/7/05 5:45:51 AM Database C:\Program Files\NCSS97\FDQ700 SU-1.SO Variable C2 Plots Section Histogram of FD-0700. SU-1

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Activity (dpm/100 cm2)

FD-0700-01, Revision 0 Page 26 of 27

One-Sample T-Test Power Analysis Page/Date/Time 2 2/7/05 5:46:40 AM Chart Section Retrospective Power Curve I I Q)

• _ _ _ _ - -- - - - -- -! I 0~ I I \ I I

I I Il I II I Survey Unit Mean (dpm/100 cm2)

FD-0700-01, Revision 0 Page 27 of 27