ML051520400

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Final Status Survey Release Record FR-2900 Roads/Railroad Survey Unit 2
ML051520400
Person / Time
Site: Maine Yankee
Issue date: 05/25/2005
From: Dockins L, Madison G, Olsen C, Packer J, Pillsbury G
Maine Yankee Atomic Power Co
To:
NRC/FSME
References
FR-2900-02, Rev 0
Download: ML051520400 (48)
v • d • e


Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-2900 ROADS / RAILROAD SURVEY UNIT 2 Prepared By: Daate:

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MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-2900 ROADS / RAILROAD SURVEY UNIT 2 A. SURVEY UNIT DESCRIPTION Survey Unit 2 is located in Survey Area FR 2900. The access roads and adjoining parking lots are located North of the Protected Area extending northward to and including Old Ferry Road. The survey unit consisted of gravel and asphalt road surfaces not previously included in FR 2900 Survey Unit 1, with the exception of almost 200 meters of road within the ISFSI boundary. The survey unit is shown in relation to the Maine State Coordinate System (West Zone) NAD 1927 on map FR2900-2 REF in Attachment 1.

The access road served as the primary access for a majority of the site's decommissioning activities. As a result, radioactive materials generated in the restricted area were routinely transferred along the route; including the ISFSI soil/debris pile as a staging area for railcar loading operations for offsite transfer/disposal. The 24,660 m2 survey design area encompassed approximately 6845 linear feet of roads plus adjoining parking areas and includes:

  • Parking Lot "C"
  • East access road from Gate 1 to the FR-2900 Survey Unit I boundary
  • South road located north of the Restricted Area except the portion included in survey area FR-01I I
  • Warehouse 2/3 parking area
  • West access road north of Gate 4 to south ISFSI boundary
  • Access roads north of the ISFSI including Old Ferry Road from the east access road to Youngs Brook The majority of road surfaces within Survey Unit 2 consist of asphalt. The majority of parking lot surfaces are soil. The access road is shown in relation to other major site structures in map FR2900-2 REF. All maps referenced in this release record are provided in Attachment I unless otherwise noted. Due to a Maine Yankee commitment, gamma re-scans were performed on 19 selected grid locations inside adjacent FR 1800 Survey Unit 2 (Reference 2). This area was not included in the original survey design area calculation. As a result, an additional 1,020 m2 of soils received gamma re-scans outside of the original survey design.

FR-2900-02, Revision 0 Page 2 of 48

B. SURVEY UNIT DESIGN INFORMATION The area was designated a Class 3 land survey unit per the LTP (Table 5-1C, R2900, Roads/Railroad Final Verification). There was no remediation of the soil/asphalt surfaces performed prior to the Final Status Survey; however, the east parking lot (Lot "C') was used for staging of clean debris prior to landfill disposal and was removed prior to FSS.

The survey unit design parameters are shown in Table 1. Given an adjusted relative shift of 3.0, it was determined that 14 direct measurements were required for the Sign Test. Fourteen direct measurements were actually performed. Measurement locations were randomly determined and are illustrated on maps FR2900-2DP REF and FR2900-2u through FR2900-2x. Because four of the direct locations (S004, S007, S008, S009) fell on asphalt, in situ gamma analysis was performed using High Purity Germanium (HPGe) In Situ Object Characterization System (ISOCS) with the detector located 13 cm from the surface. The remaining ten direct measurements (soil samples) collected from the required locations were analyzed by laboratory gamma spectroscopy instrurnentation. The ISOCS direct measurements were converted to a total gross beta dpm/1 00 cm2 by adding the higher (identified or MDA) of the reported Co-60 and Cs-I 37 components together. The field of view for the ISOCS direct measurement was approximately 531 cm2 . The soil direct sample results were converted to a total gross beta dpm/I00 cm2 by adding the higher of the reported Co-60 and Cs-137 components together to calculate a gross beta activity result using an area based on an assumed sample footprint of 929 cm2 (12" by 12").

The survey was also designed to include 281 overlapping scans for asphalt or soil surfaces, each of approximately 78.5 m2 area (see map FR2900-2 REF). The High Purity Germanium (HPGc) In Situ Object Characterization System (ISOCS) scan setpoint was conservatively set at one-half the DCGL, as shown in Table 2-2 (Attachment 2). The survey design also called for investigation of a scan location with verified positive detection (>MDA) of Co-60. The initial standard ISOCS model used was based on an assumed concrete depth of 5 cm, which was consistent with the concrete depth profile assumed for concrete surfaces and rock ledge for survey units within the Restricted Area (RA). After starting the survey, additional information was obtained from the decommissioning manager that the road surfaces north of the ISFSI and Old Ferry Road had been resurfaced during plant operation. Since the scan locations performed up to that time were only for areas south of the ISFSI, no reanalysis was necessary since the areas scanned had not been paved over. The ISOCS model was revised using the new information obtained from the decommissioning manager that the repaving depth was approximately 7 inches (17.78 cm) of asphalt.

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.

FR-2900-02, Revision 0 Page 3 of48

TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria Basis Area 24,660 m2Class 3 Unlimited Based on an adjusted LBGR of Number of Direct 5,894 dpm/lOOcm 2 , Cs-137 sigma' Measurements Required 14 of 1,302 dpm/100 cm 2 , and a relative shift of 3.0.

._ Type I = Type 11 = 0.05 Sample Area NA Class 3 Area Sample Grid Spacing NA Class 3 Area ISOCS scan at I meter Scan Grid Area height for 78.5 m2 field Sec Section B of view Area Factor NA Only required for Class I areas Scan Survey Area 14,885 m2 Class 3 10%

Scan Investigation Level 50% of DCGL Sce Table 2-2 (Attachment 2)

LTP, Revision 4 Table 6-1 lb for DCGL 9,800 dpm/100 cm2 Pavement-Covered Areas use buried piping DCGL DCGLEic NA Class 3 C. SURVEY RESULTS Fourteen direct measurements were made in Survey Unit 2. All direct measurements were less than the DCGL. The resulting data are presented in Table 2 below.

Design sigma is based on characterization data, listed in LTP Table 5-IC Bailey House Land Area, R1800, (LTP, Rev. 4). The design sigma was converted to surface activity as follows:

Design Sigma pc/g x 2.22 dpm/pCi x Density g/cm3 x Volume cm3 /0I0 cm2 0.23 pCilg x 2.22 dpmlpCi x 1.7 g/cm 3 x I 00 cm2 (15 cm)/ 100 cm2 = 1302 dpm/ o00 cm2 FR-2900-02, Revision 0 Page 4 of 48

TABLE 2 DIRECT MEASUREMENTS Co-60 s-137 Gross Beta Activity Sample Location dpn/1i00 cm 2 dpm/100 cm 2 dpm/100 cm2

_ _ __ _ _ _ _ __ _ __ _ _ __ _ _ __ __ __ _ _ _ _ _ _(N ote 3 )

FR2900-02-3-SOO1-SS < 23 37 59 FR2900-02-3-S002-SS < 19 < 17 36 FR2900-02-3-S003-SS < 20 < 20 40 FR2900-02-3-S004-GD < 834 l < 1,190 2,024 (Note 1)

FR2900-02-3-S005-SS < 22 < 21 42 FR2900-02-3-S006-SS < 18 < 20 38 FR2900-02-3-S007-GD < 813 < 1,080 1,893 (Note 1)

FR2900-02-3-S008-GD < 744 < 1,090 1,834 (Note 1)

FR2900-02-3-S009-GD < 746 < 1,020 1,766 (Note 1)

FR2900-02-3-S010-SS < 20 < 20 41 FR2900-02-3-S01I-SS < 20 < 18 38 FR2900-02-3-S012-SS < 21 < 21 42 FR2900-02-3-S013-SS < 18 < 16 34 FR2900-02-3-S014-SS < 17 < 20 37 Mean 238 328 566 Median 21 20 41 Standard Deviation 359 505 864 Samplc Range 17 to 834 16 to 1,190 34 to 2,024 NOTES

1. Direct measurements counted for 3600 seconds taken in situ using ISOCS with 90 degree collimation (field of view 531 cm 2 ) for asphalt locations.
2. "<" indicates MDA value. Bold indicates positive detection value.
3. Summed results are rounded to the nearest integer.

ISOCS gamma scans were performed at 281 locations using an investigation level of 4900 dpm/100 cm 2 (Co-60 plus Cs-137) for the 78.5 m2 field of view designed to achieve overlapping scan coverage to ensure adequate coverage for the survey unit. The gamma scans were performed for a sufficient count time to achieve a Minimum Detectable Activity of approximately 20 % of the DCGL. All scan activity values were below the investigation level; however, one survey map area (refer to Survey map FR2900-2c) location was re-scanned after adjacent FRAC tank removal, because of positive Co-60 detection (due to FRAC tank source term shine) in several of the initial scans. After the rescans of these areas, an investigation was required on a single location, SCO9, because Co-60 was detected above MDA.2 An investigation was performed and documented using survey investigation package XR2900-2. Refer to Section D for further discussion of the investigation performed.

2 All measurements with residual Co-60 activity greater than MDA were investigated.

FR-2900-02, Revision 0 Page 5 of 48

D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS The scan of grid SCO9 resulted in a Co-60 result exceeding the investigation level (positive detection above MDA). The elevated area inside scan grid SCO9 corresponded to a portion of the snow removal debris pile located at the edge of the road. To investigate the scan location, ISOCS scans were performed to isolate (bound) the area within the scan grid, using a 19.6 m2 field of view at an open collimation height of 0.5-m. The configuration of the first investigation scans is shown on map XR2900-2c (Attachment 1). The scan results indicated that the Co-60 activity was centered within a metcr radius of the center of the original elevated scan location because the adjacent north, south, east and west scans centered on the scan field of view radius for point XCO9 failed to identify Co-60. Since the SSPA-3 used to identify the highest gross activity in the elevated scan location (XC09) did not identify the area causing the Co-60 activity, (direct sample result for XCO9 also did not identify Co-60) a second ISOCS investigation was performed to further investigate and localize the elevated area using a 1.5 m2 field of view with 90-degree collimation at a height of 0.7-m.

The second investigation failed to isolate the elevated pocket containing the Co-60 activity, most likely due to reduced detector efficiency from the addition of the 90-degree collimator and a field of view that was too large. The second investigation scan locations are shown on map XR2900-2cXI (Attachment 1).

The third investigation, successfully identified the elevated pocket of Co-60 activity using a modified open collimation design to narrow the field of view to about 0.8 m2 at a height of 0.5-m. The elevated scan location was sectioned in a triangular grid containing a total of 20 scan locations with 30 cm spacing. The third investigation scan locations are shown on map XR2900-2cX2 (Attachment 1). Scan locations S308-S310 and S320 identified Co-60. Since technical review of the gamma spectrums indicated that the Co-60 contamination might be deeper than the assumed depth of 15 cm, two direct samples (one at 0-6" depth, one at 6"- 12" depth) were required for scan locations where Co-60 was identified. Of all the direct samples obtained, only one identified Co-60 (20.5 pCi/g) in a 0-6" sample for scan location S310.

"As Found" and "As Left" investigation results are presented in Table 3-1 (Attachment 3).

Since the investigation direct sample exceeded the Co-60 DCGL for areas outside the Restricted Area (1.52 pCi/g), in accordance with Reference 1, an area around the elevated sample was reclassified to Class 1. A portion of the investigation scan grid was located in a disturbed area used for piling snow/debris. Because a small strip of area (approximately 0.3 in by 25 m) from FR2900 Survey Unit 2 was located in the footprint of the snow/debris pile, the strip was upgraded in classification to Class 1. The excluded strip includes portions of scan grids SC03, SC04, and SC09 through SCI 1. The excluded/reclassified section will be included in Class 1 FR 0900 Survey Unit 4 which will be designed to include the area around the snow removal debris pile. The final total scan area for Survey Unit 2 is 14, 877 M2 , or 60.3% of the total area of the survey unit.

FR-2900-02, Rcvision 0 Page 6 of 48

E. SURVEY UNIT DATA ASSESSMENT An analysis of the direct measurement results, including the mean, median, standard deviation, and sample result range, are provided in Table 2. Positively detected values are bolded in the table. Of the 14 direct measurements obtained, only one identified Cs-137. All other measurement values were below the MDA. No Co-60 activity was identified above the MDA. The mean and median activities were less than the DCGL. Without subtracting background, all direct measurement results were below the DCGL. The maximum direct sample result was equivalent to 2,024 dpm/100 cm2 .

The mean residual contamination level is 566 dpm/l 00 cm 2 . This is equivalent to an annual dose of 0.0001 mrem.3 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 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 clearly satisfied for the 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. Note that there appears to be four outliers in the plot, however, they are from the in situ gamma directs of the asphalt surfaces and indicate a much higher MDA than the direct sample results because of matrix, shielding and geometry differences when compared to a direct sample. 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 surface survey unit.

It also should be noted that the maximum gross beta activity (2,024 dpm/l 00 cm2 at location S004) is well below the DCGL of 9,800 dpm/l 00 cm 2 .

3 Using the buried pipe dose from LTP Table 6-11, the annual dose is (566/9800) x 2.52E-03 = 0.0001 mremlyr.

FR-2900-02, Revision 0 Page 7 of 48

3. A Histogram Plot was also developed based on the direct measurement values. This plot shows that the direct data were essentially a log normal distribution.
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 3 area; the FSS results were consistent with that classification except for one small area of elevated Co-60 activity which was subsequently reclassified. The direct measurement sample standard deviation was less than the design sigma. Thus, a sufficient number of sample measurements were taken.

H. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 2 was designed, performed, and evaluated in the March 2005-May 2005 time frame using the criteria of the LTP Revision 4 (Reference 1). No subsequent LTP changes with potential impact to this survey unit need to be evaluated.

1. 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 direct measurements were less than the DCGL of 9,800 dpm./100 cm 2 .

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 log-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. ISOCS scans performed at a height of I meter in a systematic grid pattern throughout the survey unit using investigation criteria of 50% of the DCGL or positive detection of Co-60 identified only one scan location (SC09) requiring investigation. Refer to Section D for discussion of the resulting investigation performed for scan location SC09 (Co-60 above MDA) and the subsequent reclassification.

It is concluded that FR2900 Survey Unit 2 meets the release criteria of I OCFR20. 1402 and the State of Maine enhanced criteria.

FR-2900-02, Revision 0 Page 8 of 48

J. REFERENCES

1. Maine Yankee License Termination Plan, Revision 4, February 28, 2005
2. Form 11 of Maine Yankee Procedure PMP 6.7.4, FSS Survey Unit and Release Record Reconciliation Form for FR 1800 Survey Units I and 2, completed 4/27/04
3. Maine Yankee Calculation No. EC-003-04, Use of Canberra In Situ Object Counting System (ISOCS) for FSS Surveys FR-2900-02, Revision 0 Page 9 of 48

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LI*4 Level I Investigation FR-2900-02, Revision 0 Page 37 of 48

Maine Yankee II Map IDt. XRZ Decommissioning Team IMaine Yankee DecommissioningProjectSurvey Form IDate: 5118/05 Survey Type: N Investigation 0 Turnover C Final Status Survey ISurvey Area Narne: Roads and Rails Final Status Survey: XR2900 SU2 Map CX1 ISOCS Survey Location S001

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7. 0140cM-/

Level I Investigation FR-2900-02, Revision 0 Page 38 of 48

DecManineai Team Maine Yankee DecommissioningProject Survey Map Map IDI XR2900.2cX2 Survey Type. Charoctetizabon Turnover a Final Status Suyvey I SurveyAroa Norme: Roads (FR2900 map "C")

It I

S304 S302 I S305 S308 I S314 I $306 S S309 I

S315 S310 S316 32 S319 S312 I .

Il I -. -f

....s,_

FR-2900-02, Revision 0 Page 39 of48

Attachment 2 Survey Unit Instrumentation FR-2900-02, Revision 0 Page 40 of 48

TABLE 2-1 INSTRUMENT INFORMATION HPGe Detectors (Laboratory Sample Analysis)

Detector No. MDC FSSI 0.04 to 0.06 (pCi/g)

FSS2 0.04 to 0.06 (pCi/g)

ISOCS Detectors (Field Scan Measurements)

Detector No. MDC I 7605 181 to 1,190 dpm/100 cm2 l_ (Notes I and 2)

TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, AND INVESTIGATION LEVEL Parameter Instrument: ISOCS Comments 181 to 778 dpm/100 cm2 Co-60 Design MDC specified to be Scan MDC 307 to 1,190 dpm/100 cm 2 Cs-137 980 dpm/100 cm2

___ ___ ___ ___ ___ ___ ___ ___ ___ __ (C o-60 plus C s- 13 7)

DCGL 9,800 dpm/100 cm2 Gross Beta dpm/100 cm' (dpm/100 cm ) (Co-60 plus Cs-137) LTP Rev eb 4 Table 6.1 Level 4,900 dpm/l 00 cm(

Investigation l (Co-60 plus Cs-137) 50% DCGL (Reference 1)

(ISOCS @ im) (Note 2) ___________

NOTES

1. ISOCS Detector 7605 used for direct locations on asphalt road surfaces with the 90 degree collimator at 13 cm perpendicular from surface for a 531 cm2 field of view.
2. ISOCS Detector 7605 used for 180 degree open collimation at 1 m perpendicular from surface for a 78.5 m2 field of view. Any positive detection of Co-60 was investigated FR-2900-02, Revision 0 Page 41 of 48

Attachment 3 Investigation Table FR-2900 02 , Revision o Page 42 of 48

TABLE 3-1 INVESTIGATION TABLE INITIAL SURVEY INVESTIGATION

- ISOCS Scan @ Im Total Beta SSPA-3 Scaler Highest Soil Total Beta "As Left" ISOCS TAs Left" Location Nuclide performed dpm/100 Highest Value Sample results dpm/100 cm2 performed 5/20/05 dpm/

5/14/052 (Note I) (kcpm) (pCi7g) (Note 2) p d5/20/05 (Note c

_ _ __ __ __ _ (d pMlM ) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ d m m )( oe 1 SCO9 Co-60 22,270 653 <3 20.5 (ote 3) 7,012 <26,700 473

_ __ _ _ Cs-137 <43,000 __ _ _ _ _ _ _ _ _ _ _ _ _<0.17 __ __ _ __ _20,575 _ _ _ _ _ _

NOTES

1. Total Beta dpm/100 cm 2 equals ISOCS scan values (Co-60 dpm/m 2 + Cs-137 dpm/m 2 )* m2 /(100 cm) 2*(100 cm 2 /100 cm2 ).
2. Total Beta dpm/100 cm2 equals direct soil sample values (Co-60 pCi/g+ Cs-137 pCi/g)*2.22 dpm/pCi*sample weight (g)/sample area (cm 2 )*(l00 cm2 /l 00 cm 2 ). Sample weight was 1417 g and the sample area was 929 cm2 (12" by 12").

No Co-60 was detected in any other direct sample.

3. The activity in the soil sample was determnined to be a discrete Co-60 particle of 0.02 1t Ci.

FR-2900-02, Revision 0 Page 43 of 48 Statistical Data 2 0 FR-2900-0 , Revision Page 44 of 48

Survey Package FR2900 Unit 2 Surface Sign Test Summary Survey Package:l FR2 900lRoads Survey Unitl 02 Evaluator G. Madison _

DCGL, 9,800 dprnIO00cm2 Gross Beta DCGL DCGL~m NIA NA for Class 3 Areas LBGR: 4.900 dpm/1OOcm2 Sigma: 1,302 dpm/1OOcm2 Type I error 0.05 Type II error 0.05 Total Instrument Efficiency. 100.0% data adjusted for various effs.

Detector Area (c2): 100 Choosing 'N/A sets material Material Type: N/A background to "O" Za: 1.645 Sign p: 0.99865 Calculated Relative Shift: 3.7 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: _ 11 N-Value+20%: 14 Number of Samples: 14 Median: 41 dpm/1OOcm2 Mean: 566 dpm/1OOcm2 Net Static Data Standard Deviation: 864 dpm/Ih0Ocm2 Total Standard Deviation: 864 SRSS Maximum: 2,024 dpm/100cm2 Adjusted N Value: 14 S+ Value: 14 Critical Value: 10 Sufficient samples collected: Pass Maximum value <DCGL,: Pass Median value <DCGLW~ Pass Mean value <DCGL,: Pass Maximum value <DCGLe,,: Pass Total Standard Deviation <=Sigma: Pass SU passes Sign test results: Pass

  • l r.!

The survey unit passes all conditions: Pass SU Passes FR2900-SU2-SudfaceSign 5/2/05 12:11 PM FR-2900-02, Revision 0 Page 45 of 48

FR2900 SU-2 Quantile Plot

&N2500 E

0 2000 - X ._

Activity(dpm/1 00 IE1500 -cm2) 1u000 -Median (dpm/100 500--

=l- I cm2) _

0 25 50 75 100 Percent

One-Sample T-Test Report Page/Date/Time 2 5/2/05 12:45:31 PM Database Variable C2 Plots Section Histogram of FR-2900, SU-2 0

E co E

Activity (dpm/100 cm2)

FR-2900-02, Revision 0 Page 47 of 48

One-Sample T-Test Power Analysis Page/Date/Time 2 5/2105 12:47:00 PM Chart Section Retrospective Power Curve 1.0- *

  • 0.8 \

D 0.6 0a .4.

0.2- ,.\.

0.0 I -I 0 I 2000 4000 6000 80ON 1o6oo Survey Unit Mean (dpml100 cm2)

FR-2900-02, Revision 0 Page 48 of 48

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