ML051050072

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Final Status Survey Release Record FD-3500 Storm Drains Survey Unit 2
ML051050072
Person / Time
Site: Maine Yankee
Issue date: 04/05/2005
From: Olsen C, Packer J, Pillsbury G, Randall D, Tozzie R
Maine Yankee Atomic Power Co
To:
NRC/FSME
References
FD-3500-02, Rev 0
Download: ML051050072 (26)
v • d • e


Text

I MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FD-3500 STORM DRAINS SURVEY UNIT 2 Prepared By: (9_ A / Date: Z- - OS FSS Engineer - Signature De/e ke /qJ(e.

Printed Name Reviewed By: Date: l°IL FSS S o gnature Printed Name Reviewed By: Date: ___f____

Ind pendent Reviw- Signature Printd Ne Approved By: Date: 71&5_

rintend Signature

. Printed Name/

Approved By: p2 Date: zV R FASS, MOP - Signature Printed Name Revision 0

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FD-3500 STORM DRAINS SURVEY UNIT 2 A. SURVEY UNIT DESCRIPTION Survey Unit 2 is a portion of Survey Area FD-3500, the Storm Drains survey area. The Storm Drains accommodated the overboard discharge of surface water through buried piping of varying diameters and material types across the developed portion of the site. The survey area consists of Class I and Class 3 piping sections. The classification of individual piping sections was based on their potential for contamination, this determination was based primarily on location. The survey classes for particular sections are specified in Attachment 5A of the License Termination Plan (LTP, Reference 1).

Survey Unit 2 consists of the piping leading into Outfalls 9 and 10 (Storm Drain Sections 1 and 2, respectively per LTP Attachment 5A). The outfalls are located near grid coordinate 407,500 N and 624,500 E using the Maine State Coordinate System (West Zone) NAD 1927.

Outfalls 9 and 10 and the associated piping are shown in relation to other major site structures in map FD 3500-02 SITE and FD 3500-2 REF. All maps referenced in this release record are provided in Attachment 1 unless otherwise noted. The survey unit is approximately 416 m 2 .

B. SURVEY UNIT DESIGN INFORMATION These storm drain sections were designated Class 3 per the LTP Revision 3.

Aside from ground water drainage of Class 3 areas, the only known potential source for radiological contamination of the survey unit was the temporary liquid effluent' discharge hose that ran through the pipe. The line was a continuous piece of hose which ran from Manhole 20 to the Outfall 10 discharge point (see map FD 3500-2 REF of Attachment 1).

Prior to and through the Spent Fuel Pool drain down, the hose was routinely pressure tested prior to each discharge. No evidence was found to indicate any leakage from the hose into the pipe. Following Spent Fuel Pool discharge, the hose was rerouted through Manhole 5.

All effluent discharges through Outfall 10 were permanently discontinued prior to performing the FSS of the survey unit. It is, therefore, appropriate to retain the designation for this section of the storm drain piping system as a Class 3 survey unit.

The survey unit design parameters are shown in Table 1. Given an adjusted relative shift of 3, it was determined that 14 direct measurements were required for the Sign Test; however, the number of samples was increased because the LTP also requires a minimum of 30 direct samples points (to accommodate an efficient field layout, 32 were taken).

All effluent concentrations were below 10 CFR 20 Subpart 0, Appendix B, Table 2, Column 2 values.

FD-3500-02, Revision 0 Page 2 of 26

Measurement locations were determined by equally distributing the measurement locations along the circumference and length of the accessible areas of the piping at the outfall. Since the outfall is the lowest elevation of the survey unit, it is considered to be an appropriate location for sampling, as is suggested by the LTP as a key element of the survey design for Class 3 piping. Locations are illustrated on the maps FD 3500-2c and FD 3500-2f.

Removable contamination samples were obtained at each measurement location.

The survey was also designed to include 20 scan grids for surfaces, each of approximately 0.3 m2 or smaller area (see maps FD 3500-2a, FD 3500-2b, FD 3500-2d, FD 3500-2e). The total area scanned was approximately 4.7 m2 which is 1.1% of the survey unit area.

Instrument scan setpoints were set at the DCGL plus background, as shown in Table 2-2 (Attachment 2).

To accommodate measurement geometry requirements for surfaces of differing curvatures and damp sample locations, 43-68 data was evaluated with different efficiencies, as appropriate. Due to the presence of 0.25" of water in the bottom of the piping in Outfall 10, two in sitar gamma spectroscopy (ISOCS) measurements were made to completely scan accessible areas of the piping.

Background values were established for each particular instrument probe application based on ambient background scaler values in the survey unit and previously established material backgrounds. These background values, listed in Table 1, were used to establish net activity for direct measurements.

Since scan measurements are performed in peak hold mode, it is appropriate to apply a peak hold background for calculating scan setpoints. The background applied was the ambient peak hold average value used in determining the material background for concrete (622 cpm)

Reference 5.

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. 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.

In addition to FSS measurements, one sediment sample was removed from each of the first catch basins above Outfalls 9 and 10. These two samples were counted to environmental LLDs by laboratory gamma spectroscopy.

FD-3500-02, Revision 0 Page 3 of 26

TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria Basis Area 416m' Based on an LBGR of 4,900 dpm/l00cm2 sigma2 of 727 Number of Direct dpm/ 00 cm, and an adjusted Measurements Required relative shift of 3.0, N = 14 for Type I = Type II = 0.05 (Minimum = 30 per the LTP)

Sample Area N/A Class 3 Sample Grid Spacing N/A Class 3 Scan Grid Area 0. 18 m2 0.29 m2 6-inch bands for 15" and 24" diameter piping.

Area Factor N/A Class 3 Scan Survey Area 4.7 m2 (1.1%) Class 3 (1- I0%) required Background .A -i Outfall 9 (24" diameter) 43-68 Direct 3,358 dpm/l00 cm2 Ambient and Material Scaler Value (dry concrete surfaces)

Outfall 9 (24" diameter) 43-68 Direct 7,569 dpm/1 00 cm2 Ambient and Material Scaler Value (damp concrete surfaces)

Outfall 10 (15" diameter) 43-68 Direct 3,312 dpm/100 cm2 Ambient and Material Scaler Value (dry concrete surfaces)

Outfall 9 (24" diameter) 43-68 Scan 3,797 dpmn/100 cm2 Peak hold ambient value (dry concrete surfaces)

Outfall 10 (15" diameter) 43-68 Scan 4,747 dpm/100 cm2 Peak hold ambient value (dry surfaces)

Outfall 9 (24" diameter) 43-68 Scan 10,034 dpm/100 cm2 Peak hold ambient value (damp surfaces)

Scan Investigation Level DCGL plus background See Table 2-2 (Attachment 2)

DCGL 9,800 dpm/100 cm' LTP, Rev. 3 Design DCGLEac N/A Class 3 C. SURVEY RESULTS Thirty-two direct measurements were made in Survey Unit 2. Once corrected for ambient and material background, all direct measurements were less than 50% of the DCGL. The resulting data are presented in Table 2 below. No verified alarms were received during the surface scans. The two ISOCS measurements performed in Outfall 10 were less than MDA for Cs-137 and Co-60. Therefore, no investigations were required.

2 Design sigma is based on sigma values of Turbine Building draining into these Class 3 portions of FD-3500.

FD-3500-02, Revision 0 Page 4 of 26

TABLE2 DIRECT MEASUREMENTS Gross Akctivit~ Net Activity Sample Location dpm cm(Table I Background Subtracted) dpm100cmdpm/100 cm 2 FD3500-02-COOI 8,727 1,158 FD3500-02-C002 3,150 -208 FD3500-02-C003 4,585 1,227 FD3500-02-C004 3,199 -159 FD3500-02-C005 9,421 1,852 FD3500-02-C006 3,309 -49 FD3500-02-C007 4,664 1,306 FD3500-02-C008 3,492 134 FD3500-02-C009 10,388 2,820 FD3500-02-COI0 3,523 165 FD3500-02-COI 4,518 1,160 FD3500-02-C012 3,315 43 FD3500-02-C013 10,259 2,691 FD3500-02-C014 3,370 12 FD3500-02-C015 4,866 1,508 FD3500-02-C016 3,846 488 FD3500-02-C027 3,342 31 FD3500-02-C028 3,274 -38 FD3500-02-C029 3,976 664 FD3500-02-C030 3,365 53 FD3500-02-C031 3,526 214 FD3500-02-C032 3,167 -145 FD3500-02-C033 3,083 -229 FD3500-02-C034 3,404 92 FD3500-02-C035 3,907 595 FD3500-02-C036 3,434 122 FD3500-02-C037 3,549 237 FD3500-02-C038 3,831 519 FD3500-02-C039 3,648 336 FD3500-02-C040 3,793 481 FD3500-02-C041 3,770 458 FD3500-02-C042 3,556 244 Mean 4,414 1 553 Median 3,552 -

-240 Standard Deviation 2,092 1 788 Sample Range 3,083 to 10,388 1 -229 to 2,820 NOTE: Measurements COOl through C016 were obtained in the 24" pipe.

The efficiency and background values for damp concrete were applied to locations COO I, COO5, COO9, and C013.

FD-3500-02, Revision 0 Page 5 of 26

D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS No investigations were required as there were no verified scan alarms.

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 sample result with background subtracted was equivalent to 2,820 dpm/l 00 cm2 .

All 43-68 scan data was less than the investigation levels; therefore, there were no investigations required. The ISOCS scan measurements did not detect plant-derived activity in excess of the MDAs. The maximum ISOCS scan measurement MDAs were 201 dpm/l00 cm 2 and 268 dpm/100 cm 2 for Co-60 and Cs-137 respectively.

When adjusted for background, the mean residual contamination level is 553 dpm/l 00 cm2 .

This is equivalent to an annual dose of 0.0001 mrem3 .

F. ADDITIONAL DATA EVALUATION Attachment 4 provides additional data evaluation associated with Survey Unit 2, 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 Surnmary table, as well as a listing of the key release criteria. As is shown in the table, key release criteria were satisfied, with one exception. An "investigate" flag was produced because the direct measurement sigma exceeded the design sigma, however, sufficient power is evident, particularly when one considers that 32 samples were taken for the FSS of this survey unit.

3 From Table 6-11 of the LTP, the buried piping dose is 2.52E-03 mrem/y, therefore, (553/9,800) x 2.52E-03 =

0.0001 mrem/y.

FD-3500-02, Revision 0 Page 6 of 26

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. There is no reason to conclude that the data set represents other than random variations in a Class 3 concrete surface survey unit. It also should be noted that the maximum net activity (2,820 dpmll 00 cm 2 at location C009) is well below 50% of the DCGL.
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 Powver 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.

As mentioned in Section B, removable contamination samples were obtained at each (direct) measurement location. In that this survey unit involved buried piping area 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 alpha activity less than the MDA values (i.e., < 3.8 dpm/I 00 cm2 ) and the beta activity also generally less than the MDA values. Two of the 32 samples indicated beta activity above MDA with a maximum value of 3.5 dpm/100 cm 2 . 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. Smears are typically taken immediately after performing direct measurements. Due to an instrument failure, this was not the case in Outfall 10 where measurements were repeated. The removable contamination was negligible; consequently, this has no impact on the validity of direct measurement results.

Although not applicable to the release decisions, the gamma spectroscopy analyses of catch basin sediment samples found no plant-derived nuclides in excess of environmental MDA values which further demonstrates that the system was appropriately classified.

G. CHANGES 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 greater than the design sigma. However, the survey unit easily passed the Sign Test. Thus, a sufficient number of sample measurements were taken.

FD-3500-02, Revision 0 Page 7 of 26

11. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 2 was designed, performed, evaluated, and reviewed from late 2004 to early 2005. The design was performed to the criteria of the approved LTP (Revision 3 Addenda). There were no subsequent LTP changes with the potential to impact the design, conduct, or assessment of the final status survey of Survey Unit 2.

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 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 (9,800 dpm/l00 cm 2 )

after being corrected for background.

A Sign Test Summary analysis demonstrated that the Sign Test criteria were satisfied. The direct measurement sigma was determined to be greater than that used for design, but a sufficient number of samples were taken to produce adequate power.

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. ISOCS measurements were used to supplement the scan data due to water on the bottom of the pipe. The ISOCS results did not identify any plant-derived activity.

In addition, while not part of the release decision criteria, removable contamination sampling confirmed that the majority of remaining activity in this survey unit was fixed. Sediment samples taken from the catch basins did not identify plant-derived activity.

It is concluded that FD-3500 Survey Unit 2 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 the NRC, MN-03-049, dated September 11,2003
5. Maine Yankee Engineering Calculation EC-039-01 FD-3500-02, Revision 0 Page 8 of 26

Attachment 1 Survey Unit Maps FD-3500-02, Revision 0 Page9of26

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Outfall 9 Storm Drain Leg Total Interior Surface Area = 201 sq-m Outfall 10 Storm Drain Leg FD-3500-02, Revision 0 Page IIof 26 Total Interior Surface Area = 215 sq-m

Maine Yankee I Map ID#:FD 3500-2a Decommissioning Team IMaine Yankee DecommissioningProject Surtey Forn IRevised: 1/26/05 Survey Type: a Characterization O Turnover C Final Status Survey Survey Area Name: Outfall 9 Final Status Survey FD3500 Survey Unit 2: Outfall Survey Scans C017 - C021 9 _C111= =1IE End of (an n _ Q O R  : R 2 2f 14 c %aCb . , 1. t

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Maine Yankee Map ID #: FD 3500-2b Decommissioning Team Maine Yankee DecomnissioningProjectSuney Form IRevised: 1/26/05 Survey Type: O Characterization O Turnover C Final Status Survey ISurvey Area Name: Outfall 9 Final Status Survey FD3500 Survey Unit 2: Outfall 9 _ _IIIIIEII=II

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-TOP. 0- -TOP, 0- TOP, o L_ LTOP, 0- -TOP,0-C022 C023 C024 C025 C026 FD-3500-02, Revision 0 Page 13 of 26 Total Surface Scan Area for Outfall 9= 2.9 sq-m

Maine Yankee I Map ID #: FD 3500-2c Decommissioning Team IMaie Yankee DecommissoitioigProject Stn'ey,Form IRevised: 9/1/04 Survey Type: E Characterization l Turnover 53Final Status Survey I Survey Area Name: Outfall 9 Final Status Survey FD3500 Survey Unit 2: Outfall 9 Direct Points C001 - C016 End of Drain 2' from End of Drain 4' from End of Drain 6' from End of Drain FD-3500-02, Revision 0 Page 14 of 26

Maine ankeeMa-pID #:FD3500-2d Maine Yankee g a Maine Yankee DecomniissioningProjectSurvey F or l Revised: 1/26/05 Decommissioning Team I ,11 Survey Type: EO Characterization El Turnover X Final Status Survey I Survey Area Name: Outfall 10 Final Status Survey FD3500 Survey Unit 2: Outfall 10 Survey Scans C043 - C047 End of I

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Maine Yankee Map ID #:FD 3500-2e Decommissioning Team Maine Yankee DecommissioningProject Sun'ey Forom Revised *1126105 Survey Type: El Characterization O Turnover X Final Status Survey ISurvey Area Name: Outfall 10 Final Status Survey FD3500 Survey Unit 2: Outfall 10 -111=11 Survey Scans C048 - C052 ,:r_;>1-;LL@X.i 's":e'Ss- <;^Sub'-'ts End of Drain 7E C2Z2I CZ nI

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-TOP. 0-FD-3500-02, Revision 0 Page 16 of 26 Total Surface Scan Area for Outfall 10 = 1.8 sq-m

Maine Yankee I. IMap ID#: FD 3l0d-2f Decornmissioninq Team IMaine Yankee DecommissioningProjectSurvey Form IRevised: 9/l/04 Survey Type: E Characterization E Turnover X Final Status Survey I Survey Area Name: Outfall 10 Final Status Survey FD3500 Survey Unit 2: Outfall 10 Direct Points C027 - C042 End of Drain 2' from End of Drain 4' from End of Drain 6'from End of Drain FD-3500-02, Revision 0 Page 17 of 26

Maine Yankee Manle Yankee DecoininssioithgProjectSun'ey For i Map ID#:FD 3500-02g Decommissioning Team I IRevised:1/3/05 SurveyType: ElCharacterization O Turnover UFinalStatusSurvey SurveyAreaName: Outfall10 Final Status Survey FD3500 Survey Unit 2: Outfall 10 ISOCS Scan - Locations C053 & C054 Position for C053 Vl-3' 1 -3 Opening Outfa110 at River 1~

Attachment 2 Survey Unit Instrumentation FD-3500-02, Revision 0 Page 19 of 26

TABLE 2-1 INSTRUMENT INFORMATION E-600 SIN [ Probe S/N (type) 1648 177991 (43-68/5) 1928 177991 (43-68/5)

HPGc Detectors (Laboratory Analysis)

Detector Number MDC FSSI T -sto 0.08 pCi/g ISOCS Detectors (Field Measurements)

Detector Number MDC ISOCS-7605 1.14 to 2.68 E4 dprn/rn TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, AND INVESTIGATION LEVEL l 43-68 (Outfall 9) 43-68 (Outfall 10) 43-68 (Outfall 9)

Detector 24"diameter 15" diameter Pipe 24" diameter damp surfaces dry surfaces dry surfaces Scan AIDC 4,841 2,290 1,832 (dpm/100 cm2) (Note 1) (Note 1)

DCGL2 9,800 9,800 9,800 (dpm/100 cm ) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

IvsiainLvl19,841 14,545 13,596 Investigation Level l ( DCGL plus DCGL plus DCGL plus (Alarm setpoint) background) background) background)

(dp 00 m/1 c m) ~(N ote 2) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

NOTES: 1. Separate scan MDC developed for the 43-68 by adjusting the LTP Table 5-6 value for the change in efficiency due to geometry or moisture.

2. The survey was designed for dry pipe conditions. Land vapor condensed on the upper portions of the piping at the time of the survey, and is accounted for in the table.

FD-3500-02, Revision 0 Page 20 of 26

Attachment 3 Investigation Table (No Investigations Required)

FD-3500-02, Revision 0 Page 21 of 26

Attachment 4 Statistical Data FD-3500-02, Revision 0 Page 22 of 26

Survey Package FD3500 Unit 2 Surface Sign Test Summary

'Evaluation lnputValue intsX ornm_

Survey Package: FD3500 Outfalls 9 &10 Survey Unit: 02 Storm Drain piping Evaluator: DR DCGL,: 9,800 DCGLX : 9,800 N/A Class 3 SU LBGR: 4,900 Sigma: 727 Type I error: 0.05 Type II error: 0.05 Total Instrument Efficiency: 13.0% data adjusted for various effs.

Detector Area (cm 2 ): 126 Choosing 'N/A' sets material Material Type: N/A background to "0"

.v.->>.-.-.i'w,.. ,f,'Z','Ialc'ula'ted alu'es;<-tri-z Zp,: 1.645 Zp: 1.645 Sign p: 0.99865 Calculated Relative Shift: 6.7 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: 14 15Q A

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Number of Samples: 32 Median: 240 Mean: 553 Net Static Data Standard Deviation: *788 Total Standard Deviation: 788 SRSS Maximum: 2,820 Adjusted N Value: ' -32

- S+ Value: 32 Critical Value: 21 Sufficient samples collected: Pass Maximum value <DCGL,: Pass Median value <DCGL,: .;Pass Mean value <DCGL:  : Pass Maximum value <DCGL,=: :Pass N/A Class 3 SU Total Standard Deviation <=Sigma: lnvestigate SU passes, See Section F Sign test results: -

  • Pass The survey unit passes all conditions: Investigate SU passes FD3500-u2-SurfaceSign 3130/05 12:29 PM FD-3500-02, Revision 0 Page 23 of 26

FD-3500 SU-2 Quantile Plot 3000 2500 E _0 0

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One-Sample T-Test Report Page/Date/Time 2 3/8/05 2:28:17 PM Database C:\Program Files\NCSS97\FD3500 SU-2.S0 Variable C2 Plots Section Histogram of FD-3500, SU-2 0.

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z 5.000 1250.000 2125.1 Activity (dpmI100 cm2)

FD-3500-02, Revision 0 Page 25 of 26

One-Sample T-Test Power Analysis Page/Date/Time 2 3/8/05 2:29:20 Ph9 Chart Section Retrospective Power CAurve 1.0 -, a

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FD-3500-02, Revision 0 Page 26 of 26

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