ML052140074

Rev 2 to Calculation E900-05-028, Open Land FSS Design - OL7 Paved Surfaces & Concrete, Appendices a & B to Final Status Survey Report for Saxton Nuclear Experimental Corporation OL7 Paved Surfaces and Concrete.

ML052140074
Person / Time
Site:	Saxton File:GPU Nuclear icon.png
Issue date:	05/31/2005
From:	Tritch T FirstEnergy Corp
To:	Office of Nuclear Reactor Regulation
References
E900-05-028, Rev 2
Download: ML052140074 (77)

Text

-APPENDIX A SNEC Calculation E900-05-028 Open Land FSS Design - OL7 Paved Surfaces and Concrete

Original SNEC CALCULATION COVER SHEET CALCULATION DESCRIPTION Calculation Number Revision Number Effective Date Page Number E900-05-028 2 ///65T I of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete Question 1 - Is this calculation defined as 'In QA Scope'? Refer to definition 3.5. Yes 0 No El Question 2 - Is this calculation defined as a 'Design Calculation"? Refer to definitions 3.2 and 3.3. Yes El No El NOTES: If a 'Yes' answer is obtained for Question 1, the calculation must meet the requirements of the SNEC Facility Decommissioning Quality Assurance Plan, If a 'Yes' answer is obtained for Question 2. the Calculation Originators immediate supervisor should not review the calculation as the Technical Reviewer.

DESCRIPTION OF REVISION Revision 1 - added option to scan concrete, using 126 cm2 GFPC probe, at 30 cm/sec.

Revision 2 - added the entirety of DCGL Calculation Logic - CV Yard Soil & Boulders (Decay Update) as Attachment 2.

APPROVAL SIGNATURES Calculation Originator Tristan M. Tritchl Ci7. 4 f>.

IDate Technical Reviewer W. J. Cooper/ Date -/3//

Additional Review A. Paynter/ Date 3 A5 z Additional Review Date

- ' s q. 7' SNEC CALCULATION SHEET calculation Number Revision Number Page Number E900-05-028 2Page 2 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 1.0 PURPOSE T 1.1 The purpose of this calculation is to develop a final status survey design for open land area OL7 (non-soil only) at the Saxton Nuclear Experimental Corporation (SNEC) facility. The soil portions of OL7 will be surveyed under Open Land FSS Design - OL7 Soils, E900 022. The OL7 fence surveys will be performed under Miscellaneous Chain Link Fences -

Survey Design, E900-05-023.

1.2 Survey Area OL7 is an Impacted Class 2 area which encompasses the old and new access roads, the current personnel office and break room complex, and the count room trailer on the SNEC facility decommissioning project. It covers approximately 17,900 square meters (179 1Om x 1Om grids). Of that surface area, a bit more than 14,300 square meters is soil and the remaining surface area is comprised of paved areas, both asphalt and concrete.

Table 5-5 of the SNEC License Termination Plan (LTP) limits the physical size of Class 2 survey areas to between 2,000 and 10,000 square meters. Due to this area constraint, OL7 will be subdivided into three smaller survey units, namely OL7-1 through OL7-3, containing 6200, 4200, and 7500 square meters, respectively. Of those areas, only OL7-1 (2543 square meters concrete and asphalt) and 0L7-2 (1504 square meters asphalt) are involved in this survey design.

1.3 Class 2 structures are limited to 1000 square meters, so OL7-1 and OL7-2 structures are broken down further. OL7-1 concrete is 990 square meters. OL7-1 asphalt is broken down into MA8-18, 795 square meters and MA8-19, 761 square meters. OL7-2 asphalt is broken down into MA8-20, 792 square meters and MA8-21, 711 square meters.

1.4 Both SNEC personnel scan data and Shonka Research Associates data have indicated that no detectable activity greater than the Administrative Limit (AL) exists in this entire survey area.

1.5 The general layout of the two survey units is shown on Attachment 1-1. Scale survey drawings of the Penelec warehouse pad, warehouse sump, concrete pillars, SSGS concrete, and roadway asphalt are shown on Attachments 6-1, 6-2, 6-3, 6-5, 6-6, and 6-9.

2.0

SUMMARY

OF RESULTS The following information should be used to develop a survey request for this survey unit. The effective DCGLw value is listed below. This value is derived from previously approved derived values for "CV Yard Soil and Boulder Samples' in SNEC calculation E900-04-005 (Reference 3.13).

The US NRC has reviewed and concurred with the methodology used to derive these values. See Attachment 2-1 and Reference 3.8.

Table 1, DCGLw Values Gross Activity DCGLw (dpml100 cur) I 26445 (19834 A.L.)

NOTE: AL. is the site Administrative Umit (75% of effective DCGLw) 2.1 Survey Design 2.1.1 Scanning of concrete surfaces shall be performed using a L2350 with 43-68B Jar e area gas flow Droportional counter calibrated to Cs-137 (see typical calibration information on Attachment 3-1). The instrument efficiency shall not be less than that assumed on Attachment 4-1 as 23.9% - Cs-137.

SNEC CALCULATiON SHEET Calculation Number Revision Number Page Number E900-05-028 2 Page 3 of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete 2.1.2 Scanning asphalt surfaces shall be performed using a 2" dia. by 2" long Nal detector with a Cs-1 37 window setting (Reference 3.1). The window will straddle the Cs-137 662 keV full energy peak width (see typical calibration information on Attachment 3-1). The instrument conversion factor/efficiency shall not be less than that assumed on Attachments 4-2 and 4-3: 205.6 cpmluRlh - Cs-137.

2.1.3 For concrete surfaces, an efficiency correction factor (ECF) is applied to compensate for efficiency loss when surveying rough surfaces based on Reference 3.14 and Attachment 2-8. The ECF is based on a surface irregularity of 1 inch or less. This is conservative as actual observed irregularity is typically less than one inch. Also, the.loss of efficiency is based on moving the detector away from a 150 cm2 source. If the area of the residual activity is larger, then the efficiency loss would be smaller due to an increase in the detector's "field-of-view".

2.1.4 The fraction of detectable beta-emitting activity affects the efficiency and is determined by the nuclide mix. The mix detectable beta fraction is determined to be 60% based on Reference 3.13. Because the adjusted DCGLw used is based only on the modified Cs-137 DCGLw, the mix percentage is not applied to the adjusted surrogate DCGLw. The gross activity DCGLw, which would include all the low energy activity and would require an adjustment to the mix percentage, is considerable higher at 44434 dpm 100cm 2 . The Cs-137 adjusted surrogate activity already accounts for the detectable beta yield of the mix.

Table 2, Concrete Surface Scanning Parameters MDCscan Scan Speed Maximum Distance from Surface DCGLw Action  % Coverage (dpm/1OOcm 2)^ (cmlsec) Level 1781 10 1' (gap between detector face & > 3400 ncpm 10% - 100%

surface) 3085 30 (gap between s detector face & > 3400 ncpm 10% - 100%

surface)

• See Attachment 2-1, 2-2, 4-1, and 4-4 for calculations Table 3, Asphalt Surface Scanning Parameters MDCscan Scan Speed Maximum Distance from Surface DCGLw Action  % Coverage (dpmll OOcm 2)" (cm/sec) Level 725072 in OL7-2 25 5' (gap between detector face & > 330 ncpm 10% - 100%

^ See Attachment 2-1, 2-2, 4-2, and 4-3 for calculations 2.1.5 This MDCscan (shown in Attachments 4-1 and 4-4) is based on a 360 cpm background. On 317/05, measurements were collected from the SSGS boiler pad in OL1. This data is used for the variability assessment for the COMPASS determination of sample requirements and is shown in Attachment 8-2. Unaffected

eSNEC CALCUJLATION SHEET >;

Calculation Numnber Revision Number Page Number E900-05-028 2 Page 4 of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete material backgrounds were determined using data obtained from the Williamsburg Station which resulted in a mean background value of 306 +/- 34.5 cpm as shown in Attachment 8-1.

2.1.6 The scan DCGLw Action Levels listed in Tables 2 and 3 do not include background.

The DCGLw action level is based on fixed measurements and does not include

'human performance factors' or 'index of sensitivity' factors (see Reference 3.10).

2.1.7 If a net count rate greater than the 'DCGLw action level" in either Table 2 or Table 3 is encountered during the scanning process, then the surveyor should stop and locate the boundary of the elevated area, and then perform a 'second phase" fixed point count of at least 30 seconds duration. If the second phase result equals or exceeds the 'DCGLw action" level noted in either Table 2 or Table 3, then the surveyor should mark the elevated area appropriately and document the count rate observed and an estimate of the affected area.

2.1.7.1 Class 2 concrete should be scanned to include 10% to 100% surface coverage at a rate of about 10 cm/sec. to 30 cm/sec. Vertical walls of the Penelec warehouse pad are Class 3 per the LTP; however, they will be surveyed as Class 2 for the purposes of completing this survey. The Penelec Warehouse sump and the two concrete pillars should be scanned to 100%

surface coverage. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area. Altemate areas should be selected from the remainder to provide the required coverage.

2.1.7.2 Class 2 asphalt would normally be surveyed using GFPC probes; however, for expediency (25 cm per second versus 10 cm per second with GFPC), Nal scanning will be used instead. This can be justified because the asphalt roadways in OL7 pre-date the operation of the nuclear plant so it is not expected that any plant-derived contaminants could be under the asphalt.

Also, since inception of the Saxton Decommissioning Project, no elevated readings have been detected on the asphalt in the two survey units involved in this survey design. Class 2 asphalt shall be scanned to include 10% to 100% surface coverage at a scan rate of about 25 cm per second as detailed below. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area. Altemate areas should be selected from the remainder to provide the required coverage.

2.1.7.3 The surfaces of both the concrete and asphalt should be clear of debris to ensure detection parameters are not affected.

2.1.8 The minimum number of fixed measurement sampling points indicated by the COMPASS computer program (Reference 3.3) is 11 each for the asphalt in OL7-1 and OL7-2 and the total of all concrete surfaces in 0L7-1 (see COMPASS output on Attachments 7-1 to 7-7). Fixed point measurements should be IAW Section 2.2.

The MDCscan (concrete) is below the effective administrative DCGLwc, 13 7 (1781 to 3085 DPM/1OOcm 2 MDCscan @360 cpm bkg < 19834 DPMII1OOcm 2 AL). The MDCscan (asphalt) is below the effective administrative DCGLwC>37 1 (5502 or 7277 DPM/1OOcm 2 MDCscan @83 cpm or 144 cpm bkg < 19834 DPM/1OOcm 2 AL). No

~ -a.... SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-028 2 Page 5 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete fixed point measurements were indicated by VSP for either the Penelec Warehouse sump or the concrete pillars.

2.1.9 All of the concrete in 0L7-1 is considered to be one surface with respect to obtaining static measurements. This is because all the photographic evidence suggests the concrete was poured in a similar time frame and all of it pre-dates the operation of the nuclear plant. Secondly, Shonka Research Associates, under SR-80 and SR-84, meticulously surveyed (100% coverage) both the Penelec warehouse pad, the Southwest Garage, and the SSGS footprint and found that the areas surveyed 'meet the radiological criteria for license termination" (Reference 3.15). Though there are no surveys of the two concrete pillars, they are included with the warehouse and SSGS concrete because the timeframe in which they were built is similar, if not identical, to that of the warehouse pad and SSGS. The portion of Southwest Garage that resides in 0L7-1 is approximately 7 m2 (18 inches by 50 feet) and is not expected to indicate the presence of plant-derived radionuclides due to the aforementioned Shonka surveys. Therefore, it will not be surveyed.

2.1.10 VSP (Reference 3.4) is used to plot all random start asphalt sampling points on the included diagrams. See Attachments 6-1, 6-3, 6-6, and 6-9 for VSP sampling point locations).

2.1.11 Some sampling points may need to be adjusted to accommodate obstructions within the survey area. Contact the SR coordinator to report any difficulties encountered when laying out grid sampling points.

2.1.12 Because of the unusual arrangement of the multiple concrete surfaces in this 0L7-1, the drawings in Attachment 6 are intended to be as close as practicable to the as-left conditions. If the actual layout is different from that shown, then review with the cognizant SR coordinator, finish the survey if practicable, and mark up the drawings to indicate actual layout.

2.1.13 When an obstruction is encountered that will not allow collection of a sample, contact the cognizant SR coordinator for permission to either move or delete the sampling point. .

NOTE If remediation actions are taken as a result of this survey, this survey design must be revised or re-written entirely.

2.2 Measure both fixed point and elevated areas(s) on concrete and asphalt IAW SNEC procedure E900-IMP-4520.04 (Reference 3.2).

3.0 REFERENCES

3.1 SNEC Calculation No. E900-03-018, 'Optimize Window and Threshold Settings for the Detection of Cs-137 Using the Ludlum 2350-1 and a 44/10 Nal Detector", 817/03.

3.2 SNEC Procedure E900-IMP-4520.04, 'Survey Methodology to Support SNEC License Termination".

3.3 COMPASS Computer Program, Version 1.0.0, Oak Ridge Institute for Science and Education.

H SNEC CALCULATION SHEET *5** - .

Calculation Number Revision Number Page Number E900-05-028 2 Page 6 of 10 Subjed Open Land FSS Design - OL7 Paved Surfaces and Concrete 3.4 Visual Sample Plant Version 3.0, Copyright 2004, Battelle Memorial Institute.

3.5 SNEC Facility License Termination Plan.

3.6 SNEC Procedure E900-IMP-4500.59, 'Final Site Survey Planning and DQA".

3.7 GPU Nuclear, SNEC Facility, "Site Area Grid Map", SNECRM-020, Sheet 1, Rev 4,1/18/05.

3.8 SNEC Calculation No. E900-03-012, Effective DCGL Worksheet Verification.

3.9 SNEC Procedure E900-IMP-4520.06, 'Survey Unit Inspection in Support of FSS Design".

3.10 NUREG-1575, "Multi-Agency Radiation Survey and Site Investigation Manual', August, 2000.

3.11 Microsoft Office Excel, Version 11.0.5612, Microsoft Corporation Inc., 1985-2003.

3.12 SNEC Procedure E900-ADM-4500.39 uChain of Custody for Samples" 3.13 CV Yard Survey Design - North West Side of CV, E900-04-005.

3.14 SNEC Calculation 6900-02-028, GFPC Instrument Efficiency Loss Study.

3.15 Shonka Research Associates, Inc., 'Final Report for SCM Survey of Saxton Nuclear Experimental Corporation", Rev. 1, 3/3/05.

3.16 SNEC FSS Radiological Survey Data Form FSS-1541, 4/27/05.

4.0 ASSUMPTIONS AND BASIC DATA 4.1 The COMPASS computer program is used to calculate the required number of random start systematic samples to be taken in the survey unit (Reference 3.3).

4.2 Data shown on Attachments 8-2 and 8-4 are used as the initial estimates of variability for concrete and asphalt, respectively.

4.3 The MARSSIM Sign Test will be applicable for this survey design. No background subtraction will be performed under this criterion during the DQA phase.

4.4 The Visual Sample Plan (VSP) computer code (Reference 3.4) locates the required number of fixed survey points, determined by COMPASS, on the survey maps for asphalt in each survey unit. Fixed survey points for concrete were chosen independent of VSP.

4.5 References 3.5 and 3.6 were used as guidance during the survey design development phase.

4.6 Background reference for concrete was obtained from the Williamsburg concrete study and is 306 cpm (Attachment 8.1). Asphalt background was determined to be approximately 79 cpm (Attachment 8.3 and Reference 3.16).

4.7 The determination of the physical extent of this area is based on Reference 3.7. The extent of the SSGS footprint was later modified/extended from OL3 into 0L7-1 by virtue of a site walkdown on 4/28/05.

4.8 There has been no known remediation in Area OL7.

4.9 This survey design uses Cs-137 as a surrogate for all SNEC facility related radionuclides in the survey unit. The effective DCGLw is the Cs-137 DCGLw from the SNEC LTP (6.6 pCi/g) adjusted (lowered) to compensate for the presence (or potential presence) of other SNEC-related radionuclides. In addition, an administrative limit (75%) has been set that

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-028 2 Page 7 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete further lowers the permissible Cs-137 concentration to an effective surrogate DCGLw for this survey area.

4.10 The sample database contained only one sample, which was assayed both on site and off site, with which to determine the effective radionuclide mix for Area 0L7. In order to obtain a more representative mix of expected radionuclides, data from OL1 and OL2 were used instead. The decayed set of sample results were input to the spreadsheet titled 'Effective DCGL Calculator for Cs-137" (Reference 3.8) to determine the effective volumetric DCGLw values for the survey units, then changed to an equivalent surface contamination level. The output of this spreadsheet is shown on Attachment 2-6 which is copied from Reference 3.13. The spreadsheet was previously reviewed.

The Nal detector scan MDC calculation is determined based on a 25 cm/sec scan rate, a 1.38 index of sensitivity (95% correct detection probability and 60% false positive) and a detector sensitivity of 205.6 cpm/uRlhr for Cs-137. Additionally, the detection system incorporates a Cs-1 37 window that lowers sensitivity to background in the survey unit. The asphalt background is approximately 83 com in 0L7-1 and 144 cpm in 0L7-2.

4.11 The survey units described in this survey design were inspected. A copy of the 0L7 specific portion of the SNEC facility post-remediation inspection report (Reference 3.9) is included as Attachments 9-1 through 9-5.

4.12 No special area characteristics including any additional residual radioactivity (not previously noted during characterization) have been identified in this survey area.

4.13 The decision error for this survey design is 0.05 for the a value and 0.1 for the P value.

4.14 "Special measurements", as described in the SNEC LTP sec 5.5.3.4, are not included in this survey design.

4.15 No additional sampling will be performed IAW this survey design beyond that described herein.

4.16 SNEC site radionuclides and their individual DCGLw values are listed on Exhibit I of this calculation.

4.17 The survey design checklist is listed in Exhibit 2.

4.18 Area factors are shown as part of COMPASS output (see Attachment 7-1) and are based on the Cs-137 area factors from the SNEC LTP.

5.0 CALCULATIONS 5.1 All calculations are performed internal to applicable computer codes or within an Excel spreadsheet.

6.0 APPENDICES 6.1 Attachment 1-1 is a diagram of survey units 0L7-1 and 0L7-2.

6.2 Attachments 2-1 through 2-8 show the DCGL Calculation Logic - CV Yard Soil & Boulders and the Cs-137 Efficiency Loss with Distance from Source study for GFPC probes (Reference 3.13 and 3.14).

6.3 Attachment 3-1 is a copy of the calibration data from typical Nal and GFPC radiation detection instrumentation that will be used in this survey area.

-SNEC CALCULATION'SHEET Calculation Number Revision Number Page Number E900-05-028 2 Page 8 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 6.4 Attachments 4-1 through 4-4 are the MDCscan calculation sheets for surface materials in dpm/100 cm2 .

6.5 Attachment 5-1 is the MicroShield dose rate calculation results for a 56.4 cm diameter source at a distance of 5" used, for Nal detector modeling, to determine the exposure rate from a 1 pCi/cm2 Cs-137 source term in a disk geometry.

6.6 Attachments 6-1 through 6-11 show the random sampling points and scan locations, for both concrete and asphalt, and reference coordinates for Survey Units 0L7-1 and 0L7-2.

6.7 Attachments 7-1 through 7-7 are COMPASS outputs for Survey Units 0L7-1 (concrete) and MA8-18 through MA8-21 (asphalt) showing area factors, the number of sampling points in each survey unit, and prospective power.

6.8 Attachments 8-1 through 8-4 show both concrete and asphalt backgrounds and material variability results from OL7 samples.

6.9 Attachments 9-1 through 9-5 are copied from the most recent inspection report for 0L7.

-~ .. SNEC CALCULATION'SHIEET Calculation Number Revision Number Page Number E900-05-028 2 Page 9 of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete Exhibit I SNEC Facility Individual Radionuclide DCGL Values (a) 25 mremly Limit 4 mrem/y Goal 25 mremly Limit (All Pathways) (Drinking Water)

Radionuclide Surface Area Open Land Areas Open Land Areas (b)

(dpml1OOcm 2 ) (Surface & Subsurface) (Surface & Subsurface)

, (pCilg) (pCilg)

Am-241 2.7E+01 9.9 2.3 C-14 3.7E+06 2 5.4 Co-60 7.1 E+03 3.5 67 Cs-1 37 2.8E+04 6.6 397 Eu-152 1.3E+04 10.1 1440 H-3 1.2E+08 132 31.1 Ni-63 1.8E+06 747 1.9E+04 Pu-238 3.OE+01 1.8 0.41 Pu-239 2.8E+01 1.6 0.37 Pu-241 8.8E+02 86 19.8 Sr-90 8.7E+03 1.2 0.61 NOTES:

(a) While drinking water DCGLs will be used by SNEC to meet the drinking water 4 mrem/y goal, only the DCGL values that constitute the 25 mremly regulatory limit will be controlled under this LTP and the NRC's approving license amendment.

(b) Usted values are from the subsurface model. These values are the most conservative values between the two models (i.e.,

surface & subsurface).

r.. -SNEC CALC ULION SHEET T Calculation Number Revision Number Page Number E900-05-028 2 Page 10 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete Exhibit 2 Survey Design Checklist Calculation No. Location Codes E900-05-028, Rev. 2 0lL7 IT MR VEW REVIEW FOCUS F C SStatus (Circle One) Reviewer Initials & Date ITEM Has a survey design calculation number been assigned and is a survey design summary Yes, description provided? _ _

2 Are drawings/diagrams adequate for the subject area (drawings should have compass Yes, headings)?

3 Are boundaries properly identified and is the survey area classification clearly indicated? Yes, 4 Has the survey area(s) been properly divided into survey unitsIAW EXHIBIT 10 Yes, 5 Are physical characteristics of the area/location or system documented? Yes, 6 Is a remediation effectiveness discussion included?Yes 7 l Have characterization survey and/or sampling results been converted to units that are comparable to applicable DCGL values?

8 Is survey and/or sampling data that was used for determining survey unit variance included? Yes, 9 Is a description of the background reference areas (or materials) and their survey and/or Yes, sampling results included along with a justification for their selection? Yes,_e 10 Are applicable survey and/or sampling data that was used to determine variability included? Yes, Ni 11I Will the condition of the survey area have an impact on the survey design, and has the Yes, probable impact been considered in the design? es, e Has any special area characteristic including any additional residual radioactivity (not 12 previously noted during characterization) been identified along with its impact on survey Yes, l

______ ~~design?_ _ _ _ _ _

13 Are all necessary supporting calculations and/or site procedures referenced or included? e NMA 14 Has an effective DCGLw been identified for the survey unit(s)? NM5 15 Was the appropriate DCGLEJC included in the survey design calculation? Yes, 16 Has the statistical tests that will be used to evaluate the data been identified? Yes, 17 Has an elevated measurement comparison been performed (Class 1 Area)? Yes, _

18 Has the decision error levels been identified and are the necessary justifications provided? Yes, 19 Has scan instrumentation been identified along with the assigned scanning methodology?_ Yes,____

20 Has the scan rate been identified, and is the MDCscan adequate for the survey design? Yes,___)

21 Are special measurements e.g., in-situ gamma-ray spectroscopy required under this design, Yes, and is the survey methodology, and evaluation methods described? e s , _D, 22 Is survey instrumentation calibration data included and are detection sensitivities adequate? Yes, 23 Have the assigned sample and/or measurement locations been clearly identified on a diagram Yes or CAD drawing of the survey area(s) along with their coordinates? Yes,,

24

_____

Are investigation levels and administrative limits adequate, and are any associated actions clearly indicated?

'<

(.....

N/A

. Ww f_

25 For sample analysis, have the required MDA values been determined.?Yes, 26 Has any special sampling methodology been identified other than provided in Reference 6.3? Yes, NOTE: a copy of this completed form or equivalent, shall be included within the survey design calculation.

DCGL Calculation Logic-CV Yard Soil & Boulders (Decay Update)

Survey Unit: SNEC Containment Vessel (CV) Yard Soil and Boulders

Description:

The purpose of this calculation is to determine a representative isotopic mix for the CV Yard Soil and associated Boulders from available sample analyses. The effective surface and volumetric DCGLWs are then determined from the mean percent of applicable samples.

Ill. Data Selection Logic Tables: The radionuclide selection logic and subsequent DCGL calculations are provided in seven (7) tables. These tables were developed using Microsoft Excel. Table explanation is as follows.

Table 1: Reduced Listing - This table, which has been extracted from a larger database, provides a list of the most representative sample analyses. Results are from scoping, characterization, and pre/post remediation surveys. The samples consist of soil and soil-like media that was taken in support of the aforementioned surveys. As applicable, a sample number, sample location/description, radionuclide concentration, analysis date are provided for each sample. Positive nuclide concentrations are noted with yellowlshaded background fields while MDA values are noted in the gray shaded fields.

Values in red typeface are on-site analysis results.

Table 2: Reduced Listing - Decayed - This table decays the data from Table 1. Half-life values (days) are listed above each respective nuclide column. Samples are decayed from the respective analysis date to December 15, 2004. Positive results are denoted in a yellow background field while MDA values are noted in the gray shaded fields. Values in red typeface are on-site analysis results.

Table 3: Reduced Listing Decayed - MDAs Removed - This table provides the best overall representation of the data. Non-positive nuclide columns have been removed as well as all the MDA values. Therefore, 11 nuclides have been reduced to four (4).

Table 4: Mean Percent of Total for Positive Nuclides - This table provides the calculation methodology for determining the relative fractions of the total activity contributed by each radionuclide. From this information the mean, sigma, and mean % of total are calculated.

From this information the mean, sigma, and mean % of total are calculated. The mean %

of total values is used to calculate the surface gross activity DCGLW per MARSSIM equation 4-4. See Table 6. Note that the mean percent values were averaged using only the positive sample results in each column. In some cases only a single nuclide value (e.g. Sr-90) had a positive result. This value is listed as the value in the mean result field, and results in higher "mean percent of total' values for single positive radionuclides in the mix, which is a conservative.

Table 5: Ratio to Cs-1 37 for Positive Nuclides - This table provides the calculation methodology for determining the surrogate ratio to Cs-1 37 for each radionuclide. From this information the mean, sigma, and mean % of total are calculated. The mean % of total values is used to calculate the volumetric DCGLW per MARSSIM equation 1-14. See Table 7. Note that the mean percent values were averaged using only the positive sample results in each column. In some cases only a single nuclide value (e.g. Sr-90) had a positive result. This value is listed as the value in the mean result field. This results in higher "mean percent of total" values in the mix, which are conservative.

Note: From Tables 4 and 5, only the "mean % of total" values are used as input to the "Effective DCGL Calculation Spreadsheet" as illustrated in Tables 6 and 7.

Table 6: Effective DCGL Calculator for Cs-137 (in dpm/100 cm2 ) - This table provides the surface gross activity DCGLW calculation results from data derived from Table 4.

1 14 VA' TCgM 6,AJ7- 2 -/

Table 7: Effective DCGL Calculator for Cs-1 37 (in pCilg) - This table provides the surrogate volumetric modified Cs-137 DCGLW calculation results from data derived from Table 5.

IV. Summary - Since the CV Yard and Boulders are volumes of soil or rock material, existing in place or in a pile, the release limit is primarily based on the volumetric DCGLW. Using the above data selection logic tables the calculated Cs-1 37 volumetric DCGLW is 5.75 pCi/g (previous value was 5.73 pCig due to earlier decay date of January 15, 2004). The updated value will be reduced by 25% as part of SNEC's requirement to apply an administrative limit as discussed in the License Termination Plan (LTP).

Using the above data selection logic tables the calculated gross activity DCGLwfor surface area is 44,306-dpm/lO0 cm2 (previous value of 44,434-dpm/100 cm2 due to earlier decay date of January 15, 2004). The updated value will be reduced by 25% as part of SNEC's requirement to apply an administrative limit as discussed in the License Termination Plan (LTP).

2  ? z Ho

TABLE 1 - REDUCED LISTING EC S E I^R ILI Q,.M c-20 C4137 Arn-241 Pu.2- Pu-230 Pu-M C-14 Eu-tS2 Anws Ode CVT=nd I . 51u5U I Cv Tuew 2 SX9sa9919 I 111074 5*Am SW 2

3 S)1G.063 T rth CVY 4 MsLU0M9 T NarthCV 6 T I Nidh CVY 4.8O 1 M.053O - 29.2002 Noth CV YwadSol AY.1 , OLI 3.44 I D.0529 0.0279 J" 29.2002 7 NMiO CVYard "I r M I nIAM I E rem I22 18i3 In ai6 1 n,0I 1 IN n '214 13 A Inr S Noalh CVY 2.9 r M 0.0715 I 0.35 59 0.164 l 0.0745 l O.O46 1 5.27 0.215 12.6 0.0734 Jy 3 2002 Se FFmeCV,89DE,,OL1 11.31 r 0.02 0.01 T o 23.1 0.037 I O.7 T 0.967 1 2.104 3.93 H.6 .M IS It 11 SXSL2849 I I EnetF From CV, B8T S. OL 11.52 r OM I 0.01 0031 I 0.016 1 0.o97 r I 0.0133 I AfMl I I 10A 1.903 4 7.76 I 7S 0.04 1,5tol'Deph0L lDA ooo7r pl

___ ..-- 4**tD 16A 4 13 SX)SL2871 T r.led W lls, V2Way U, OL1 March 8, 2002 14 SXSL2672 TOt sne-ism .17nwiS b- Bottn, (teOtop uerl), 2U Is MUM214 I 8 an ft Side (r Depth), L I1 S)151.342 Sol Pie, CVY FedanEnd Skis, iR37,OL 17 SXSL314C I Tobwnq L2B=4 MT.1m432-MI"- j E CV atYad, 3s Ell Skio (W Death)l OL1 Is SXSL3t145 UIXT,ISNS24S1t xiEedSe. R.3i, 0L1 I Is IE~a CY ' IToeIMDh. oL1 1.937 1 0.043 21  ! CVY. 2.22 1 °in J.0S I 0.9 0.017i R0.071 22 cY CV 2.23 1 0i0316 0.5 1 .5 I 0.0221 61 I 0.0364 23 I CVY 1 1 2.24410.0277t 0.07 31 1 0:02 oOM _ I _ I _ __,

I_______TABLE 2- REDUCED LISTING - DECAYED I T1Q2 TIl T112 T1i2 T112 T112 T112 T1f2 T12 T112 T12 Doebb 4485.27 110446.15 11925.2331 11019.59 r157861.1 T3 I M8138481 5259.6 1 209283 136561.531 4967.4 I Decenetr15.24 I p bSWamie No LAB M. H-3 e-l CO-U C-37 Am-24 n.. 4 I xs2 A_ F__ PT id%

i i 2 CVTwIel BVXTSIt2BU-01 3.72E401 1076-01 1= 74,2C0D 1400 "I

111074 Srt, ISS3 2

SXSL103 _ A.3 FnF I Jb- 7. 2C02 902 4 SXSL1CBS Al 00

.2 h CVYard 901 8 S)XSL1115 LJl NMlllCVYAd E' 900 SX)SL1 22 4 NorthCVYard 96 1296 900 7

I~

11 S)G1301 SXS1.2949

__SXSLt 9

27C SX(SL2B4S

_7 I

U. Nilh CVYarn N CV' b S'FreeCVY, EW.,OL1

~Et s FroMCV,eooSE. OLI 00 9.34E- W0 W6 E'

f I I 7.32E.02 &.46E-02 7.00E-03 1.79E4003 7.IE-M3 1.62E40D 4.

1.101E-0211.63E40D I' 1.24E401 I 6B4E0 t3 1 .rue

' 1X72E*

.3t u 0.00EQ0 M 1""7E.O c.Ii JAhv 3,2CC2 3.2002 February13,2C02 896 1238 123B 1036 13 ,. J.2 10i5 14 SXSL2572 Teledan-Ilt Li K; Marh , 2002 1015 Is SXSL31420 M I 83B is .S SdI Ff, CV Y IT S)KS3142 I I SXSL314S I TM Ent CVYard,)

Is 49 I SCL S 833 J_ I SdoPb, CV Y , _ _ _ s I Is fllw*I41 24 I EI t CVYwd,Sol Ph Top 8 (0 Deph) OL1 l 1.70 21 CV Yard Sol-Wed Skds,AP1-7, CLI 207E I 8.75E.81 440 22 CVYar S-ll Skis, API.? CL1 4407 23 CY YardSo- We Side,API-i7.01. 0 3.79E40 2.76E-02 14.26E-2 I 3.04E-02 440

-I Yelow Bckgrwod - Poeili' ReauL 1Ore She Dechkgrqou- MDA XXXX Rdves- OnSle Anlysis 3

TABLE 3-REDUCED LIST1NG DECAYED - MDA's REMOVED SNC Sanple No LAB N1. Lodarmeerwou H-3 Sr-Ul Co-" Ca-137 T pCIAp ldl I CV Tunnel WXT, I26I1Ml CV TunnSedset Caorhde,oL1 _ 8.81E+00 7.61E-01 1,.14E-03 115423 2 SX9SL992t9 111074 Subsuface Sw* 529 (0-5%,AY-128, OL1 om.5E-0l 053 3 SXSL1083 Telm bIe4U LS111184-I North CV Yard Sll BA-I 27, 81t7 E. Srnple 5, 0SL2 3.98E4W 8.37E-01 4.82 4 SXSL1089 Tady 9-I66l3 1.184-2 North CV Yard Sol AY-1 27, 810' E. Sue* # 3, OL1 2.64E00 1.22E400 386 S SXSL 115 Telcbma4; L19134.3 North CV Yard Sol AY-1 28,804' El.Surilb 2. OL1 4.25E00 1.70El0 sss 6 SXSL1122 Taelb'ne4M; 11315-4 North CV Yard Sol AY-129, 798 E5,SOeple 52. CI1 2.99E4W0 4.51 E410 7.50 I SXSL1 130 Telei-22A 1-11416 North CV Yard Sol AX-I 29, 803 ',E Sepe 54, OL1 4.34E400 = 2.16E-02 2.14E401 25.73 I SXSL1132 TeWube-bbn L154- North CV Yard Sol AZ-1 30, S4p* 55, S.L1 2.59EW0_ 2.45E-00 5so4 I SXSL1270 BWXT, 51666-02 AX-129S3.3 Sol CVSESide 5'FromrCV, 8W . OL1 2.14E-b1 21.37 Is ISXSL1281 OWT, 6138166-31 AX- 28,3-1, Sd, CV Turnl East 5 FromCV, 80(' 1, OLl- 4.056E400 41os II ISXSL249 Teleabnd-73226 L317-2 AnulwUWl, A-2, Sto1I0 Deph, OL1 5!SZEJ1 0S I3 SXSL2871 Teledyne-7154k 1"17131-I CV Area - East Yard Drl Pk - de, 112a Up, OL1 o 053 14 SXSL2872 Talabvw71S45 133310 CV Area - EalstYard Dir Pie -CBottom (elotop carter), oLt _ 9.30E4W2 o.o0 16 SXSL3140 B=T,1038M183-1 Est CVYYard, SaleP Wes Sfidet Deph), OL1 n8c 7.83E-01 0.78 Is SXSL3142 Taledmne 1.221-3 Sl Pke,CV Yard, Three Feat on Ead Skd, SR-37, OL1 5S9E61 0.57 17 SXSL3145 BWXT,1S314M East CV Yard. Sol Pie 5 7 on Ead Side W Depth), O"- 1.20E+00 120 Is SXSL3149 TeabpW L2264 Sd Pile,CV Yard. Slx Fast on East Side, SR-37, Oi1 2U4E.A 028 Is SXSL3153 IIWKT,1114Ji1 Ead CV Yard, Sol Pie p Top (B Depth), OL1 285E6-01 028 21 SXSL4142 Teledyne; L221U7.2 CVYYard Sol -West Sde, API-7?.0L1 8.75E-01 0.88 22 !SXSL4143 Talebne; 22187-3 CV Yard Sol -Wet Sie, API-7, O1 14.86E.O1 0.49 23 SX(SL4149 Teletne; L221 74 CV Yard Sd - We Slde, API 7, OLl- 5.97E-02 3.79E+00 3.85 TABLE 4 -MEAN PERCENT OF TOTAL FOR POSITIVE NUCLIDES -

SNECSample No LAB No Loeedlaoneserlptln H-3 Sr-U Co-Uo Ca-137 Told I CV Tu-r MWT, 811268-1i1 CV Twnel Seot Coirpoeft, OLI 0.76% 0.07% 99.17% 10.0o%

2 SX9SL9921 9 111074 Stwutce Sanple t29 (0-5), AY-128, O11 100.00% 100.0%

3 SXSL10S3 Tekeibm4M-1 .L1814-I North CV Yard Sol BA-127, 81Z H. Sanple t 5, 0L2 82.64% 17.36% 1QO.0%

4 SXS1U089 Tela*ie_143184-2 NcOrthCV Yard Sal AY-127, 810' Et Seple 5 3, CLt 68.38% 31.62% 100.0%

6 SXSL1115 TebbWne4NM L11343 North CV Yard Sol AY-1 28, 804' S. Sawle 5 2, OL1 71.40% 28.60% 100.0%

S SXS1122 Teblbne4W2; un11144 North CV Yard Sol AY-1 29,7W ,.Swp1 t 2, 01L1 39.91% 60W09% 100.0%

7 SXSL1130 Tele-811622; 111311116 North CV Yard SolAX-129,83 El, Seo 4,OL1 16.89% 0.08% 83-03% 10.0 %

SXSL1132 TehdwnebU231.1614-1 North CV Yard Sol AZ-130, Sanple S, OL1 51.45% 48.55% 100.0%

Is SXSL1270 9WXT, 11166-02 AX-129,3-3, Sdl, CV SESid S FromCV,8W EI, 011 100.00% 100.0%

II SXSL1281 BIhXT. S1ia66m-t1 AX-128. 3-1, Sol, CV Tvwire East 5 From CV, 80Q E, O1- 100.0% 10Q.0%

11 SXSL2849 TebwM732251; 677-2 Aniuus Wt A-2, Sto 10 Deh, OLt 11100l% 100.0%

13 SX(SL2871 Teledhone-711416 117M-Il CV Area - EastYard Di1H Pi - tide, I i2Way Lp, OLI loo%100 100 0%

'4 SXSL2872 Tatedtye-7164; 1176- -----

CVAreo - taRti -- Eto Cbot cei , OlIt 0I 100Q%

16 SXSL3140 11T,10"36-3-I1-1 Eat CV Yard, Sol Pke@5 an West Side (6 Depth), OLt 100.00% 103.0%

SXSL3142 Teleon;q 126326-3 Sol Pie, CV Yard, Three Feet on East Sidel,SR-37, OLI1 lW1111 103.0%

Is 17 SX(SL3145 BWXT,131U6I3-111 Eat CV Yard, SdoPlb @3 on East SWe(r Deqh), LI 100.00% 103.0%

SXSL3149 Tlenyrnq 128J28-4 Sol Pie, CV Yard, Six Fed on East SdeR-37, OL1 l1000% 103.0%

Is SXSL31t3 0WXT,111"36 111-91 East CV Yard, Sol Pile Top (i Depth), 011 100.00% 1Q0.0%

21 SXSL4142 Telene; L22187-2 CV Yard Sol - West Slde, API -7, OLt o1000% 100.0%

22 SXSL4143 Taeedyan L22187-3 CV Yard Sod-West Side, AP -7, OLIt_ 1WA% 100.0%

23 SXSL4149 Tebdyne; 122167-4 CV Yard Sol -West Side, API -7, OLt 1_-_ 91i45% 103.0%

Mean-*I 0.551113 10.007635 I 0.00l66 10.841356 l 1.41 5O- 0.241 _ 0.009 0.262 Mew,% afTotal- 39.20% 0.54% 0.40% 59.65% 100.00%

2 Sow,. Meanw1.03E4001 7.63E-03 2.27E-02 1.40E+00 2.47

%of TotaI~ 41.86% 0.31% 0.92% 156.91% 10000%

4

I TABLE 6 - RATIO TO Cs-137 FOR POSITIE NUCLIDES SHlEC Sample Ho LAB llo. Locatlon)Descriptlon H-3 Sr-90 Co.60 Cs-137 Total 1 CV Tunnel BWXT, 0102059-01 CV Tunnel Sedimert Composite, OLI 7.70E-03 6.65E-04 1.OE4100 1.01 2 SX9SL99219 111074 Subsuface Sample 29 (0-51. AY-1 28, OLI ._ 00 1 .0 1i.00 3 SXSL1 063 Teledyne-80018; L19184-1 North CV Yard Sol BA-1 27, 817 El, Sample # S. OL2 4.76E2400 1.OE2+00 5.76 4 SXSLI 089 Teledyne-80019; L19184-2 North CV Yard Soil AY-1 27, 810' El, Sample # 3, OL1 2.16E400 1.OOE+00 3.16 5 SXSLII 5 Teledyne-80020; L19184-3 North CV Yard Son AY-1 28, 804' El, Sample # 2, OLI 2.50E400 1.OOE400 3.50 6 SXSL1122 Teledyne-80021; L19184-4 North CV Yard Sol AY-129,79W El. Sample #2, OLI 6.64E-01 1.OOE+00 1.68 7 SXSL 1130 Teledyne-80022; L19184-5 North CV Yard Sol AX-I 29, 80DEl, Sample # 4, OL1 2.03E-01 1.01 E-03 1.OOE400 1.20 8 SXSLI 132 Teledyne-80023; L19184-6 North CV Yard Sol AZ- 30, Sample t 5, OLI 1.06E400 1.00E+00 2.06 9 SXSL1 270 BWXT, 0108055-02 AX-1 29,3-3, Sol, CV SE Side 5 From CV, 800' El., O1 _ 1.OOE400 1.00 10 SXSL 281 BWXT, 0108055-01 AX-128, 3-1, Sonl CV Tunnel East 5S From CV, 800' El, OL1 __ 1.002+00 1.o0 11 SXSL2649 Teledyne-73220; 18077-2 AnulusWel, A-2, 5to 10' Depth, OLI 1.OOE00 1.00 13 SXSL2871 Teledyne-71949; L17838-11 CV Area - East Yard Dirt Pile - Middle, 1/2 Way Lp, CLI. 1.00 E00 1.00 14 SXSL2872 Teledyne-71948; 117838-10 CV Area - East Yard Dirt Pie - Bottom (also top center), OLI 1.OOE+00 1.00 15 SXSL3140 BWXT,1030-003-10.01 East CV Yard, Sol Ple 1! V on West Side (6BDepth), OLI 1.OOE400 1.0o 16 SXSL3142 Teledyne; L20326.3 Sol Pile, CV Yard, Three Feat on East Side, SR-37, OL1 1.OOEO00 1.00 17 SXSL3145 BWXT,1030-003-10-01 East CV Yard, Sol Pile @ 3 on East Side (6' Depth), OLI 1.WE+400 1.0o 18 SXSL3149 Teledyne; L20326.4 Sol Pile, CV Yard, Six Feet on East Side, SR-37, OLI 1.00 E+00 1.00 19 SXSL3153 BWXT,1030-003-10.01 East CV Yard, Soil Ple @ Top (6BDepth), OLI l.OOE400 1.o0 21 SXSL4142 Teledyne; L22187.2 CV Yard Sol -West Side, APt-7, OLI 1.OOE+00 1.00 22 SXSL4143 Teledyne; L22187-3 CV Yard Sol -West Side, API-7, OL1 1.OOE+00 1.0o 23 SXSL4149 Teledyne; 122187.4 CV Yard Sol -West Side, API-7, OL1 1.57E-02 1.DOE+00 1.02 i

Mean-* 1.890991 10.007699 I 0.005808 1 2.90 I Sigma* 1.656 0.009 0.000 I

i I I Mean % of Total-* 65.11% 0.27% 0.20% 34.43% 100.00%

i 2 Sigma + Me" 5.20E400 7.70E203 2.30E-02 1.00E+00 6.23

% of Totol-. 83.47% 0.12% 0.37% 16.04% 100.00%

I i I

-

I' . . .- i I '

- .-

- .. . -.. + - I.

5

Table 6 Effective DCGL Calculator for Cs-137 (dpml100 cmA2) 141%11 616= 1Yer , aMI rMUR kwml 9(s,0t;;iive i -,MlIi'A I I I -i j 25.0mmremA, TEDE Limit I I l 44.306$Ci3. dpm mtI lmA33229i pmilflv cmA2it SAMPLE tlO(s)* ICV Yard Soil & Boulder Samples - Dea 12-1 S04 =26517 _dpmrtcmA2 dpm/lO 19888 0 cm^2 I

I  :

INS NE AL7 Vf 75%

Indisldual Sample Input Limits Allowed Beta dpmMO0 Alpha dpmM100 Isotope (pCIlg, uCI, etc.) %of Total (dpmMOO cmA2) ldpmMO CmA2 mremty TEDE cmA2 cmA2 i Am-241 0.000% 27 0.00 0.00 "I'M........... 0.00 Am.241 2 C-14 0.000% 3,700,000 0.00 0.00 0.00 WA C-14 3 Co.60 5.67E-03 0.403% 7,100 178.64 0.63 178.64 IVA Co.60 4 CA13ETh t . 1. 981El 59.850% MB.v20,000s ;426517403r >W23.68't~ N26517A.. f . W37Affi . .1 5 Eu.152 0.000% 13,000 0.00 0.00 0.00 ....... Eu-152 6 H-3 5.51E-01 39.203% 120,000,000 17369.23 0.00 Hot Detectable :A -3 H3 7 Nl163 0.000% 1,800,000 0.00 0.00 Not Detectable Wk 1163 Ni a Pu-238 0.000% 30 0.00 0.00 t.E.-. .. :::::::::::: 0.00 Pu.238 9 Pu.239 0.000% 28 0.00 0.00 . -.- 0.00 Pu.239 10 Pui241 0.000% 880 0.00 0.00 flot Detectable - Pu.241 11 Sr-90 7.64E-03 0.643% 8,700 240.63 0.69 240.63 Sr-90 100.000% 44306 25.0 26936 0 Maximum Permissible dpmM 00 cmA2

,~t 7Z7k v. 1 Jl - 4'-

6

Table 7 I SHEC AV.-%!-f 75% 1 .Totftl AdftLltmItCGLiet jqiAdmnflltdIvUmLfnt-*~

Effective DCGL Calculator for Cs-137 (In pCIIg) 1 16.70 IpCI/g 1 12.53 IpCV/g I SAMPLE IlUMiER(s)J ICV YARD SOIL & BOIILnER SAMPLES. Decayed to 12-15-04 Pt~~veiZZ,UK$ C!137,Admrin AiertofiWit 17.39% 25.0 mremty TEDE Limit S.7 gC/ I I3 TpCil/S 7Rfl0% MMfl mremA nrflrntnn W.de ItAfl I Imit PO Check for 25nrvemf I Sample Input I'0rffhWDNI 8629"pie I'.

(pCI/g, uCI, 25 mremArTEDE i4 mwimnnVU'W A. Anowed pCI for I b2;~ATI~OW pICUUl Value Checked from lThb Sample Isotope etc.)  % of Total Lfmits (pCit) %mit (pCIe, 25 mremy TEDE il or,14rprexrnfD Column A or B mremty TEDE

'I Am.241 0.000% 9.9 .3 0.00 l 0.00 / :0  ; Am.241 2 C.14 0.000% 2.0 ua 0.00 _ 60.000.03 I .W0 C-C14 3 Co-60 0.006 0.200% 3.5 .003 10.04 IICO40 4 Cs.137 1.00 34.429% 6.6 5.75 .R;5! W ~~.>.u5751. t 13.79 s-137 C-TI 5 Eu.152 0.000% 10.1 0.00 I OE).0 4 I u -152 S H.3 1.89 65.106% 132 10.87 10.36 M H-3 7 Ni-63 0.000% 747 0.00 S ~10.837 I 0.00 NIOl

-63 a Pu-238 0.000% 1.8 0.00 9 Pu.239 0.000% 1.6 3 0.00 0.00 Pu-239 10 Pu.241 0.000% 86 .8 0.00 0.00 Pu241 I1 Sr.90 0.008 0.265% 1.2 0.04 0.1 JO 0.04 0 1 ll l r -90 I2,90E*00 I 100.000% 16.70 3820 16.70 4.348 l 0.304 Maximum Permissibl Maximum To Use This Informatlon, pCI/a lermissible pC~g Sample Input Units Must Be In (25 mremt) (4 mremty nct/n A 7-i-A C,/-//y7 E" _"

7

3. I . x I Cs-1 37 Efficiency Loss with Distance From Source 1.0 *1 Data: DatalLoss Model: ExpDecayl ChiA2 = 0.0001 8 C

0 0.8 yO 0.03536 +/-0.02118 C6-, xa a +0

.--- 1%.. -

-.- - -.. Al 1.00693 +/-0.01 809 a ti 1.61 706 t 0.07558 0.6 - I - . X

/ _

C, t0)

0010-, Fit = yO+A1 eA(4XXo)lt1 )

LUJ 0.4 --la 0.2 1

1I 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Inches from 150 cm2 Source +

ATcrAcmsNT 4 -tag

.I

.

I. 11 . .-

.

.

Af "_:__ 2l'Af.

.n C SNEC CALCULA1 0 C'ER SHEET CALCULATION DESCRIPTION .

Calculation Number Revision Number Effective Date Page Number E900-05-028 l 1 l5 I/5/ of 1I10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete Question I - Is this calculation defined as 'in QA Scope'? Refer to definition 3.5. Yes 0 No 0 Question 2 - Is this calculation defined as a 'Design Calculation'? Refer to definitions 3.2 and 3.3. Yes 01 No O NOTES: If a Yes' answer Isobtained for Question 1, the calculation must meet the requirements of the SNEC Faclity Decommissioning Quality Assurance Plan. If a 'Yes' answer is obtained for Question 2, the Calculation Originator's immediate supervisor should not review the calculation as the Technical Reviewer.

DESCRIPTION OF REVISION Revision 1 - added option to scan concrete, using 126 cM2 GFPC probe, at 30 crn/sec.

APPROVAL SIGNATURES Calculation Originator Technical Reviewer Additional Review Additional Review

tSN N SHEET Calculation Number Revision Number Page Number E90005028 I Page 2 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 1.0 PURPOSE t 1.1 The purpose of this calculation is to develop a final status survey design for open land area OL7 (non-soil only) at the Saxton Nuclear Experimental Corporation (SNEC) facility. The soil portions of OL7 will be surveyed under Open Land FSS Design - OL7 Soils, E900 022. The OL7 fence surveys will be performed under Miscellaneous Chain Link Fences -

Survey Design, E900-05-023.

1.2 Survey Area OL7 is an Impacted Class 2 area which encompasses the old and new access roads, the current personnel office and break room complex, and the count room trailer on the SNEC facility decommissioning project. It covers approximately 17,900 square meters (179 1lOm x 1lOm grids). Of that surface area, a bit more than 14,300 square meters is soil and the remaining surface area is comprised of paved areas, both asphalt and concrete.

Table 5-5 of the SNEC License Termination Plan (LTP) limits the physical size of Class 2 survey areas to between 2,000 and 10,000 square meters. Due to this area constraint, OL7 will be subdivided into three smaller survey units, namely OL7-1 through OL7-3, containing 6200, 4200, and 7500 square meters, respectively. Of those areas, only OL7-1 (2543 square meters concrete and asphalt) and OL7-2 (1504 square meters asphalt) are involved in this survey design.

1.3 Class 2 structures are limited to 1000 square meters, so OL7-1 and OL7-2 structures are broken down further. OL7-1 concrete is 990 square meters. OL7-1 asphalt is broken down into MA8-18, 795 square meters and MA8-19, 761 square meters. OL7-2 asphalt is broken down into MA8-20, 792 square meters and MA8-21, 711 square meters.

1.4 Both SNEC personnel scan data and Shonka Research Associates data have indicated that no detectable activity greater than the Administrative Limit (AL) exists in this entire survey area.

1.5 The general layout of the two survey units is shown on Attachment 1-1. Scale survey drawings of the Penelec warehouse pad, warehouse sump, concrete pillars, SSGS concrete, and roadway asphalt are shown on Attachments 6-1, 6-2, 6-3, 6-5, 6-6, and 6-9.

2.0

SUMMARY

OF RESULTS The following information should be used to develop a survey request for this survey unit. The effective DCGLw value is listed below. This value is derived from previously approved derived values for TCV Yard Soil and Boulder Samples' in SNEC calculation E900-04-005 (Reference 3.13).

The US NRC has reviewed and concurred with the methodology used to derive these values. See Attachment 2-1 and Reference 3.8.

Table 1, DCGLw Values I Gross Activity DCGLw (dpnmlOO cn') @

26445 (19834 A.L)

NOTE: AL Is the site Administrative Lrnit (75% of effetdive DCGLw) 2.1 Survey Design 2.1.1 Scanning of concrete surfaces shall be performed using a L2350 with 43-68B large area gas flow Proportional counter calibrated to Cs-137 (see typical calibration information on Attachment 3-1). The instrument efficiency shall not be less than that assumed on Attachment 4-1 as 23.9% - Cs-137.

SZN EC CALCULATION SHEET "

.' .

Calculation Number Revision Number Page Number E900-05-028 1 Page 3 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 2.1.2 Scanning asphalt surfaces shall be performed using a 2" dia. by 2" long Nal detector with a Cs-137 window setting (Reference 3.1). The window will straddle the Cs-137 662 keV full energy peak width (see typical calibration information on Attachment 3-1). The instrument conversion factor/efficiency shall not be less than that assumed on Attachments 4-2 and 4-3: 205.6 cpm/uRlh - Cs-137.

2.1.3 For concrete surfaces, an efficiency correction factor (ECF) is applied to compensate for efficiency loss when surveying rough surfaces based on Reference 3.14 and Attachment 2-2. The ECF is based on a surface irregularity of 1 inch or less. This is conservative as actual observed irregularity is typically less than one inch. Also, the loss of efficiency is based on moving the detector away from a 150 cm2 source. If the area of the residual activity is larger, then the efficiency loss would be smaller due to an increase in the detector's "field-of-view".

2.1.4 The fraction of detectable beta-emitting activity affects the efficiency and is determined by the nuclide mix. The mix detectable beta fraction is determined to be 60% based on Reference 3.13. Because the adjusted DCGLw used is based only on the modified Cs-137 DCGLw, the mix percentage is not applied to the adjusted surrogate DCGLw. The gross activity DCGLw, which would include all the low energy activity and would require an adjustment to the mix percentage, is considerable higher at 44434 dpm 100cm 2. The Cs-137 adjusted surrogate activity already accounts for the detectable beta yield of the mix.

Table 2, Concrete Surface Scanning Parameters MDCscan Scan Speed Maximum Distance from Surface DCGLw Action  % Coverage (dpn/l1OOcm 2)* (cm/sec) Level 1781 10 (gap between s detector face & > 3400 ncpm 10%- 100%

surface) 3085 30 (gap between s detectorface& > 3400 ncpm 10% -100%

surface)

• See Attachment 2-1,2-2,4-1, and 44 for calculations Table 3, Asphalt Surface Scanning Parameters MDCscan Scan Speed Maximum Distance from Surface DCGLw Action  % Coverage (dpm/lOOcm2)* (cm/sec) Level 5502 in 0L7-1 25 5" (gap between detector face & > 330 ncpm 10% - 100%

7277 in 0L7-2 . surface)

' See Attachment 2-1, 2-2,4-2, and 4-3 for calcutions 2.1.5 This MDCscan (shown in Attachments 4-1 and 4-4) is based on a 360 cpm background. On 3/7/05, measurements were collected from the SSGS boiler pad in OL1. This data is used for the variability assessment for the COMPASS determination of sample requirements and is shown in Attachment 8-2. Unaffected

SNEC CULATION SHFET Calculalion Number ber E900-05-028 1 Page 4 of 10 Subjed Open Land FSS Design - OL7 Paved Surfaces and Concrete material backgrounds were determined using data obtained from the Williamsburg Station which resulted in a mean background value of 306 +/- 34.5 cpm as shown in Attachment 8-1.

2.1.6 The scan DCGLw Action Levels listed in Tables 2 and 3 do not include background.

The DCGLw action level is based on fixed measurements and does not include

'human performance factors' or 'index of sensitivity' factors (see Reference 3.10).

2.1.7 If a net count rate greater than the "DCGLw action level" in either Table 2 or Table 3 is encountered during the scanning process, then the surveyor should stop and locate the boundary of the elevated area, and then perform a 'second phase" fixed point count of at least 30 seconds duration. If the second phase result equals or exceeds the "DCGLw action' level noted in either Table 2 or Table 3, then the surveyor should mark the elevated area appropriately and document the count rate observed and an estimate of the affected area.

2.1.7.1 Class 2 concrete should be scanned to include 10% to 100% surface coverage at a rate of about 10 cm/sec. to 30 cm/sec. Vertical walls of the Penelec warehouse pad are Class 3 per the LTP; however, they will be surveyed as Class 2 for the purposes of completing this survey. The Penelec Warehouse sump and the two concrete pillars should be scanned to 100%

surface coverage. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area. Alternate areas should be selected from the remainder to provide the required coverage.

2.1.7.2 Class 2 asphalt would normally be surveyed using GFPC probes; however, for expediency (25 cm per second versus 10 cm per second with GFPC), Nal scanning will be used instead. This can be justified because the asphalt roadways in OL7 pre-date the operation of the nuclear plant so it is not expected that any plant-derived contaminants could be under the asphalt Also, since inception of the Saxton Decommissioning Project, no elevated readings have been detected on the asphalt in the two survey units involved in this survey design. Class 2 asphalt shall be scanned to include 10% to 100% surface coverage at a scan rate of about 25 cm per second as detailed below. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area. Altemate areas should be selected from the remainder to provide the required coverage.

2.1.7.3 The surfaces of both the concrete and asphalt should be clear of debris to ensure detection parameters are not affected.

2.1.8 The minimum number of fixed measurement sampling points indicated by the COMPASS computer program (Reference 3.3) is 11 each for the asphalt in OL7-1 and 0L7-2 and the total of all concrete surfaces in 0L7-1 (see COMPASS output on Attachments 7-1 to 7-7). Fixed point measurements should be IAW Section 2.2.

The MDCscan (concrete) is below the effective administrative DCGLwc,137 (1781 to 3085 DPM/1OOcm 2 MDCscan @360 cpm bkg < 19834 DPMIO00cm 2 AL). The MDCscan (asphalt) is below the effective administrative DCGLwc, 137 (5502 or 7277 DPM/100cm 2 MDCscan @83 cpm or 144 cpm bkg < 19834 DPM/100cm 2 AL). No

SNEC CALCULATION SHEET. - '._

Calcublaon Number Reviso Number Page Number E900-05-028 I Page 5 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete fixed point measurements were indicated by VSP for either the Penelec Warehouse sump or the concrete pillars.

2.1.9 All of the concrete in 0L7-1 is considered to be one surface with respect to obtaining static measurements. This is because all the photographic evidence suggests the concrete was poured in a similar time frame and all of it pre-dates the operation of the nuclear plant. Secondly, Shonka Research Associates, under SR-80 and SR-84, meticulously surveyed (100% coverage) both the Penelec warehouse pad, the Southwest Garage, and the SSGS footprint and found that the areas surveyed umeet the radiological criteria for license termination" (Reference 3.15). Though there are no surveys of the two concrete pillars, they are included with the warehouse and SSGS concrete because the timeframe in which they were built is similar, if not identical, to that of the warehouse pad and SSGS. The portion of Southwest Garage that resides in 0L7-1 is approximately 7 m2 (18 inches by 50 feet) and is not expected to indicate the presence of plant-derived radionuclides due to the aforementioned Shonka surveys. Therefore, it will not be surveyed.

2.1.10 VSP (Reference 3.4) is used to plot all random start asphalt sampling points on the included diagrams. See Attachments 6-1, 6-3, 6-6, and 6-9 for VSP sampling point locations).

2.1.11 Some sampling points may need to be adjusted to accommodate obstructions within the survey area. Contact the SR coordinator to report any difficulties encountered when laying out grid sampling points.

2.1.12 Because of the unusual arrangement of the multiple concrete surfaces in this 0L7-1, the drawings in Attachment 6 are intended to be as close as practicable to the as-left conditions. If the actual layout is different from that shown, then review with the cognizant SR coordinator, finish the survey if practicable, and mark up the drawings to indicate actual layout.

2.1.13 When an obstruction is encountered that will not allow collection of a sample, contact the cognizant SR coordinatorfor permission to either move or delete the sampling point.

NOTE If remediation actions are taken as a result of this survey, this survey design must be revised or re-written entirely.

2.2 Measure both fixed point and elevated areas(s) on concrete and asphalt IAW SNEC procedure E900-IMP-4520.04 (Reference 3.2).

3.0 REFERENCES

3.1 SNEC Calculation No. E900-03-018, "Optimize Window and Threshold Settings for the Detection of Cs-137 Using the Ludlum 2350-1 and a 44/10 Nal Detector", 8/7103.

3.2 SNEC Procedure E900-IMP-4520.04, OSurvey Methodology to Support SNEC License Termination".

3.3 COMPASS Computer Program, Version 1.0.0, Oak Ridge Institute for Science and Education.

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_7- - 3 *-'-. S O!-~"~:'~-NEC iCACLTINS ET Calculaon Number Revision Number Page Number E900-05.028 1 Page 6 of 10 Subjed Open Land FSS Design - OL7 Paved Surfaces and Concrete 3.4 Visual Sample Plan,,Version 3.0, Copyright 2004, Battelle Memorial Institute.

3.5 SNEC Facility License Termination Plan.

3.6 SNEC Procedure E900-MP-4500.59, "Final Site Survey Planning and DQA".

3.7 GPU Nuclear, SNEC Facility, "Site Area Grid Map", SNECRM-020, Sheet 1, Rev 4, 1/18/05.

3.8 SNEC Calculation No. E900-03-012, Effective DCGL Worksheet Verification.

3.9 SNEC Procedure E900-IMP-4520.06, "Survey Unit Inspection in Support of FSS Design".

3.10 NUREG-1575, "Multi-Agency Radiation Survey and Site Investigation Manual", August, 2000.

3.11 Microsoft Office Excel, Version 11.0.5612, Microsoft Corporation Inc., 1985-2003.

3.12 SNEC Procedure E900-ADM-4500.39 "Chain of Custody for Samples" 3.13 CV Yard Survey Design - North West Side of CV, E900-04-005.

3.14 SNEC Calculation 6900-02-028, GFPC Instrument Efficiency Loss Study.

3.15 Shonka Research Associates, Inc., "Final Report for SCM Survey of Saxton Nuclear Experimental Corporation, Rev. 1, 3/3/05.

3.16 SNEC FSS Radiological Survey Data Form FSS-1 541, 4/27/05.

4.0 ASSUMPTIONS AND BASIC DATA 4.1 The COMPASS computer program is used to calculate the required number of random start systematic samples to be taken in the survey unit (Reference 3.3).

4.2 Data shown on Attachments 8-2 and 8-4 are used as the initial estimates of variability for concrete and asphalt, respectively.

4.3 The MARSSIM Sign Test will be applicable for this survey design. No background subtraction will be performed under this criterion during the DQA phase.

4.4 The Visual Sample Plan (VSP) computer code (Reference 3.4) locates the required number of fixed survey points, determined by COMPASS, on the survey maps for asphalt in each survey unit. Fixed'survey points for concrete were chosen independent of VSP.

4.5 References 3.5 and 3.6 were used as guidance during the survey design development phase.

4.6 Background reference for concrete was obtained from the Williamsburg concrete study and is 306 corn (Attachment 8.1). Asphalt background was determined to be approximately 79 cam (Attachment 8.3 and Reference 3.16).

4.7 The determination of the physical extent of this area is based on Reference 3.7. The extent of the SSGS footprint was later modified/extended from OL3 into OL7-1 by virtue of a site walkdown on 4/28105.

4.8 There has been no known remediation in Area OL7.

4.9 This survey design uses Cs-1 37 as a surrogate for all SNEC facility related radionuclides in the survey unit. The effective DCGLw is the Cs-137 DCGLw from the SNEC LTP (6.6 pCi/g) adjusted (lowered) to compensate for the presence (or potential presence) of other SNEC-related radionuclides. In addition, an administrative limit (75%) has been set that

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.SNEC CALCULATION.SHEET

- A.

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Calculafion Numberevison Number Page Number E900-05028 1 Page 7 of 10 Subjed ag f1 Open Land FSS Design - OL7 Paved Surfaces and Concrete further lowers the permissible Cs-137 concentration to an effective surrogate DCGLw for this survey area.

4.10 The sample database contained only one sample, which was assayed both on site and off site, with which to determine the effective radionuclide mix for Area OL7. In order to obtain a more representative mix of expected radionuclides, data from OL1 and OL2 were used instead. The decayed set of sample results were input to the spreadsheet titled "Effective DCGL Calculator for Cs-137" (Reference 3.8) to determine the effective volumetric DCGLw values for the survey units, then changed to an equivalent surface contamination level. The output of this spreadsheet is shown on Attachment 2-1 which is copied from Reference 3.13. The spreadsheet was previously reviewed.

The Nal detector scan MDC calculation is determined based on a 25 cm/sec scan rate, a 1.38 index of sensitivity (95% correct detection probability and 60% false positive) and a detector sensitivity of 205.6 cpm/uR/hr for Cs-137. Additionally, the detection system incorporates a Cs-137 window that lowers sensitivity to background in the survey unit. The asphalt background is approximately 83 cirm in 0L7-1 and 144 com in 0L7-2.

4.11 The survey units described in this survey design were inspected. A copy of the OL7 specific portion of the SNEC facility post-remediation inspection report (Reference 3.9) is included as Attachments 9-1 through 9-5.

4.12 No special area characteristics including any additional residual radioactivity (not previously noted during characterization) have been identified in this survey area.

4.13 The decision error for this survey design is 0.05 for the a value and 0.1 for the P value.

4.14 fSpecial measurements", as described in the SNEC LTP sec 5.5.3.4, are not included in this survey design.

4.15 No additional sampling will be performed lAW this survey design beyond that described herein.

4.16 SNEC site radionuclides and their individual DCGLw values are listed on Exhibit I of this calculation.

4.17 The survey design checklist is listed in Exhibit 2.

4.18 Area factors are shown as part of COMPASS output (see Attachment 7-1) and are based on the Cs-137 area factors from the SNEC LTP.

5.0 CALCULATIONS 5.1 All calculations are performed internal to applicable computer codes or within an Excel spreadsheet.

6.0 APPENDICES 6.1 Attachment 1-1 is a diagram of survey units OL7-1 and OL7-2.

6.2 Attachments 2-1 and 2-2 show the DCGL Calculation Logic - CV Yard Soil & Boulders and the Cs-137 Efficiency Loss with Distance from Source study for GFPC probes (Reference 3.13 and 3.14).

6.3 Attachment 3-1 is a copy of the calibration data from typical Nal and GFPC radiation detection instrumentation that will be used in this survey area.

-Hi Calculation Number Revision Number Page Number E900-05-028 I Page 8 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 6.4 Attachments 4-1 through 4-4 are the MDCscan calculation sheets for surface materials in dpm.100 cm2 6.5 Attachment 5-1 is the MicroShield dose rate calculation results for a 56.4 cm diameter source at a distance of 5" used, for Nal detector modeling, to determine the exposure rate from a 1 pCVcm 2 Cs-137 source term in a disk geometry.

6.6 Attachments 6-1 through 6-11 show the random sampling points and scan locations, for both concrete and asphalt, and reference coordinates for Survey Units 0L7-1 and 0L7-2.

6.7 Attachments 7-1 through 7-7 are COMPASS outputs for Survey Units 0L7-1 (concrete) and MA8-18 through MA8-21 (asphalt) showing area factors, the number of sampling points in each survey unit, and prospective power.

6.8 Attachments 8-1 through 8-4 show both concrete and asphalt backgrounds and material variability results from OL7 samples.

6.9 Attachments 9-1 through 9-5 are copied from the most recent inspection report for OL7.

iSNEC CACLTIO S T ;S. m-Calculation Number Revision Number Page Number E900-05-028 1 Page 9 of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete Exhibit I SNEC Facility Individual Radionuclide DCGL Values (a) 25 mremly Limit 4 mremly Goal 25 mremly Limit (All Pathways) (Drinking Water)

Radionuclide Surface Area Open Land Areas Open Land Areas (dpm/100cmr2 ) (Surface & Subsurface) (Surface & Subsurface)

(pCUg) (pCilg)

Am-241 2.7E+01 9.9 2.3 C-14 3.7E+06 2 5.4 Co-60 7.1 E+03 3.5 67 Cs-137 2.8E+04 6.6 397 Eu-152 1.3E+04 10.1 1440 H-3 1.2E+08 132 31.1 Ni-63 1.8E+06 747 1.9E+04 Pu-238 3.OE+01 1.8 0.41 Pu-239 2.8E+01 1.6 0.37 Pu-241 8.8E+02 86 19.8 Sr-90 8.7E+03 1.2 0.61 NOTES:

(a)While drinking water DCGLs will be used by SNEC to meet the drinking water 4 mremly goal, only the DCGL values that constitute the 25 mrem/y regulatory limit will be controlled under this LTP and the NRCs approving license amendment (b) Usted values are from the subsurface model. These values are the most conservative values between the two models (i.e..

surface & subsurface).

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Exhibit 2 Survey Design Checklist Calculation No. l Location Codes E900-05-028, Rev. 1 I 017 1 ITEM REVIEW FOCUS I Has a survey design calculation number been assigned and Is a survey design summary

__ description provided?

2 Are drawings/diagrams adequate for the subject area (drawings should have compass headings)?

3 Are boundaries property identified and Is the survey area classification dearly indicated?

4 Has the survey area(s) been property divided into survey units IAW EXHIBIT 10 5 Are physical characteristics of the area/location or system documented?

6 Is a remediation effectiveness discussion Included?

7 Have characterization survey and/or sampling results been converted to units that are comparable to applicable DCGL values?

8 Is survey and/or sampling data that was used for determining survey unit variance induded?

9 Is a description of the background reference areas (or materials) and their survey and/or sampling results included along with a justificabon for their selection?

10 Are applicable survey and/or sampling data that was used to determine variability Induded?

11 Will the condition of the survey area have an impact on the survey design, and has the probable impact been considered In the design?

Has any special area characteristic induding any additional residual radioactivity (not 12 previously noted during characterization) been Identified along with Its Impact on survey design?

13 Are all necessary supporting calculations and/or site procedures referenced or Included?

14 Has an effective DCGLw been Identified for the survey unit(s)?

15 Was the appropriate DCGLEwc Included In the survey design calculation?

16 Has the statistical tests that will be used to evaluate the data been identified?

17 Has an elevated measurement comparison been performed (Class I Area)?

18 Has the decision error levels been Identified and are the necessary Justifications provided?

19 Has scan Instrumentation been identified along with the assigned scanning methodology?

20 Has the scan rate been identified, and Is the MDCscan adequate for the survey design?

21 Are special measurements e.g., In-situ gamma-ray spectroscopy required under this design, and Is the survey methodology, and evaluation methods described?

22 Is survey Instrumentation calibration data Included and are detection sensitivities adequate?

-4 4-23 Have the assigned sample and/or measurement locations been clearly identified on a diagram or CAD drawina of the survev area(sM alone with their coordinates?

24 Are Investigation levels and administrative Eimits adequate, and are any associated actions Idearly indicated?

25 For sample analysis, have the required MDA values been determined.?

26 Has any special sampling methodology been Identified other than provided In Reference 6.3?

NOTE: a copy of this completed form or equivalent, shall be Induded within the survey design calculation.

Gas Flow Proportional Counter (GFPC) Scan MDC Calculation IMDCscan = 3085 dpm/100 cmz for Concrete in 0L7-1 I b = background (cpm) bi = background counts in the observation interval (counts) p = human perfomiance adjustment factor (unitless) d = index of sensitivity from MARSSIM table 6.5 based on 95% detection and 60% false positive SR = Scanning movement rate (cm/sec)

Wd = width of probe (cm)

A = probe area (cm 2 )

Ei = gas flow proportional detector / meter calibrated response (cpm/dpm)

Es = 2pi source efficiency (emissions/disintegration)

ECF = Efficiency Correction Factor for surface roughness (see Attachment 2-2)

Oi = Observation interval (seconds)

MDCRi = Minimum Detectable Count Rate in (ncpm)

MDCscan = Minimum Detectable Concentration for scanning (pCicm2)

DCDLeq = net count rate equivalent to the adjusted DCGL (ncpm) b= l 360 Jcpm d= 1.38 SR = 30 cm/sec Wd= 8.8 cm A= 126 cm2 Ei = j 0.478 cpm/dpm Es 0.5 ECF= 0.57 DCGL = 19834 dpm/100 cm2 Wd = 0.2933 = Oi (sec)

SR b*Oi = 1.7600 = bi (counts) 60 sec/min d*sart(bi)^60 = 374.4771 = MDCRI (ncpm)

Oi MDCRi + b = 734.4771 = gross cpm at the MDCRi MDCRi 30852968 = MDCscan (dpm/100 cm2 )

Ei*Es-ECF*P( 00)*sqrt(p)

DCGL*Ei*Es*ECF*(A/1 00) = 3404.5021 = DCGLeq (ncpm) fT~n r 4-q

I-'- SNEC CALCULATION COVER SHEET CALCULATION DESCRIPTION Calculation Number Revision Number Effecive Date Page Number E900-05-028 0 1 of 10 Subject 1

Open Land FSS Design - OU Paved Surfaces and Concrete Question I - Is this calculation defined as 'In QA Scope'? Refer to definition 3.5. Yes 0 No 0 Question 2 - Is this calculation defined as a 'Design Calculation-? Refer to definitions 32 and 3.3. Yes 0 No I NOTES: If a Yes answer is obtained for Question 1 the calculaton must meet the requirements of the SNEC Facility Decommissioning Quality Assurance Plan, If a 'Yes' answer is obtained for Question 2, the Calculation Originators immediate supervisor should not review the calculation as the Technical Reviewer.

DESCRIPTION OF REVISION APPROVAL SIGNATURES Calculation Originator Technical Reviewer Additional Review Additional Review I.

JEe~nL SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-028 0 Page 2 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 1.0 PURPOSE 7 1.1 The purpose of this calculation is to develop a final status survey design for open land area OL7 (non-soil only) at the Saxton Nuclear Experimental Corporation (SNEC) facility. The soil portions of OL7 will be surveyed under Open Land FSS Design - OL7 Soils, E900 022. The OL7 fence surveys will be performed under Miscellaneous Chain Link Fences -

Survey Design, E900-05-023.

1.2 Survey Area OL7 is an Impacted Class 2 area which encompasses the old and new access roads, the current personnel office and break room complex, and the count room trailer on the SNEC facility decommissioning project. It covers approximately 17,900 square meters (179 1lOm x 1lOm grids). Of that surface area, a bit more than 14,300 square meters is soil and the remaining surface area is comprised of paved areas, both asphalt and concrete.

Table 5-5 of the SNEC License Termination Plan (LTP) limits the physical size of Class 2 survey areas to between 2,000 and 10,000 square meters. Due to this area constraint, OL7 will be subdivided into three smaller survey units, namely OL7-1 through OL7-3, containing 6200, 4200, and 7500 square meters, respectively. Of those areas, only OL7-1 (2543 square meters concrete and asphalt) and OL7-2 (1504 square meters asphalt) are involved in this survey design.

1.3 Class 2 structures are limited to 1000 square meters, so OL7-1 and OL7-2 structures are broken down further. OL7-1 concrete is 990 square meters. OL7-1 asphalt is broken down into MA8-18, 795 square meters and MA8-19, 761 square meters. OL7-2 asphalt is broken down into MA8-20, 792 square meters and MA8-21, 711 square meters.

1.4 Both SNEC personnel scan data and Shonka Research Associates data have indicated that no detectable activity greater than the Administrative Limit (AL) exists in this entire survey area.

1.5 The general layout of the two survey units is shown on Attachment 1-1. Scale survey drawings of the Penelec warehouse pad, warehouse sump, concrete pillars, SSGS concrete, and roadway asphalt are shown on Attachments 6-1, 6-2, 6-3, 6-5, 6-6, and 6-9.

2.0

SUMMARY

OF RESULTS The following information should be used to develop a survey request for this survey unit. The effective DCGLw value is listed below. This value is derived from previously approved derived values for "CV Yard Soil and Boulder Samples" in SNEC calculation E900-04-005 (Reference 3.13).

The US NRC has reviewed and concurred with the methodology used to derive these values. See Attachment 2-1 and Reference 3.8.

Table 1, DCGLw Values I Gross Activity DCGLw (dpml100 cm')

26445 (19834 A.L.)

NOTE: A.L. is the site Administrative Limit (75% of effective DCGLw) 2.1 Survey Design 2.1.1 Scanning of concrete surfaces shall be performed using a L2350 with 43-68B large area gas flow proportional counter calibrated to Cs-137 (see typical calibration information on Attachment 3-1). The instrument efficiency shall not be less than that assumed on Attachment 4-1 as 23.9% - Cs-137.

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-028 0 Page 3 of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete 2.1.2 Scanning asphalt surfaces shall be performed using a 2" dia. by 2" long Nal detector with a Cs-137 window setting (Reference 3.1). The window will straddle the Cs-137 662 keV full energy peak width (see typical calibration information on Attachment 3-1). The instrument conversion factor/efficiency shall not be less than that assumed on Attachments 4-2 and 4-3: 205.6 cpm/uR/h - Cs-137.

2.1.3 For concrete surfaces, an efficiency correction factor (ECF) is applied to compensate for efficiency loss when surveying rough surfaces based on Reference 3.14 and Attachment 2-2. The ECF is based on a surface irregularity of 1 inch or less. This is conservative as actual observed irregularity is typically less than one inch. Also, the loss of efficiency is based on moving the detector away from a 150 cm2 source. If the area of the residual activity is larger, then the efficiency loss would be smaller due to an increase in the detector's "field-of-view".

2.1.4 The fraction of detectable beta-emitting activity affects the efficiency and is determined by the nuclide mix. The mix detectable beta fraction is determined to be 60% based on Reference 3.13. Because the adjusted DCGLw used is based only on the modified Cs-137 DCGLw, the mix percentage is not applied to the adjusted surrogate DCGLw. The gross activity DCGLw, which would include all the low energy activity and would require an adjustment to the mix percentage, is considerable higher at 44434 dpm 100cm 2 . The Cs-137 adjusted surrogate activity already accounts for the detectable beta yield of the mix.

Table 2, Concrete Surface Scanning Parameters MDCscan Scan Speed Maximum Distance from Surface DCGLw Action  % Coverage (dpml1 OOcm 2 ) J (cm/sec) Level 1781 I. 10

_ __ __ __ __ __ __ _ _ __ __ _ _ _ _ _ _ _ _ _ Js 1" (gap between detector face &

u rf a ce )>

> 3400 ncpm 3 0 nc m 10% -10C%

1 % - 0 %

See Attachment 2-1, 2-2, and 4-1 for calculations Table 3, Asphalt Surface Scanning Parameters MDCscan Scan Speed Maximum Distance from Surface DCGLw Action  % Coverage V00cm2)

(dpml (cm/sec) Level 7527in 01-7-1 25 5" (gap between detector face & >30np 0 10 72 in O17 surface) > 330 ncpm 1 See Attachment 2-1, 2-2, 4-2, and 4-3 for calculations 2.1.5 This MDCscan (shown in Attachment 4-1) is based on a 360 cpm background. On 3/7/05, measurements were collected from the SSGS boiler pad in OL1. This data is used for the variability assessment for the COMPASS determination of sample requirements and is shown in Attachment 8-2. Unaffected material backgrounds were determined using data obtained from the Williamsburg Station which resulted in a mean background value of 306 +/- 34.5 cpm as shown in Attachment 8-1.

'.  ; -I -*6> .- ' .

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-028 0 Page 4 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 2.1.6 The scan DQGLw Action Levels listed in Tables 2 and 3 do not include background.

The DCGLw action level is based on fixed measurements and does not include

'human performance factors' or 'index of sensitivity' factors (see Reference 3.10).

2.1.7 If a net count rate greater than the "DCGLw action level" in either Table 2 or Table 3 is encountered during the scanning process, then the surveyor should stop and locate the boundary of the elevated area, and then perform a "second phase" fixed point count of at least 30 seconds duration. If the second phase result equals or exceeds the UDCGLw action" level noted in either Table 2 or Table 3, then the surveyor should mark the elevated area appropriately and document the count rate observed and an estimate of the affected area.

2.1.7.1 Class 2 concrete should be scanned to include 10% to 100% surface coverage at a rate of about 10 cm per second. Vertical walls of the Penelec warehouse pad are Class 3 per the LTP; however, they will be surveyed as Class 2 for the purposes of completing this survey. The Penelec Warehouse sump and the two concrete pillars should be scanned to 100% surface coverage. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area. Alternate areas should be selected from the remainder to provide the required coverage.

2.1.7.2 Class 2 asphalt would normally be surveyed using GFPC probes; however, for expediency (25 cm per second versus 10 cm per second with GFPC), Nal scanning will be used instead. This can be justified because the asphalt roadways in OL7 pre-date the operation of the nuclear plant so it is not expected that any plant-derived contaminants could be under the asphalt.

Also, since inception of the Saxton Decommissioning Project, no elevated readings have been detected on the asphalt in the two survey units involved in this survey design. Class 2 asphalt shall be scanned to include 10% to 100% surface coverage at a scan rate of about 25 cm per second as detailed below. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area. Alternate areas should be selected from the remainder to provide the required coverage.

2.1.7.3 The surfaces of both the concrete and asphalt should be clear of debris to ensure detection parameters are not affected.

2.1.8 The minimum number of fixed measurement sampling points indicated by the COMPASS computer program (Reference 3.3) is 11 each for the asphalt in OL7-1 and 0L7-2 and the total of all concrete surfaces in OL7-1 (see COMPASS output on Attachments 7-1 to 7-7). Fixed point measurements should be IAW Section 2.2.

The MDCscan (concrete) is below the effective administrative DCGLwcs.137 (1781 DPM/100cm 2 MDCscan @360 cpm bkg < 19834 DPM/1OOcm 2 AL). The MDCscan (asphalt) is below the effective administrative DCGLwcs. 137 (5502 or 7277 DPM/1OOcm 2 MDCscan @83 cpm or 144 cpm bkg < 19834 DPM/1OOcm 2 AL). No fixed point measurements were indicated by VSP for either the Penelec Warehouse sump or the concrete pillars.

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-028 0 Page 5 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 2.1.9 All of the concrete in OL7-1 is considered to be one surface with respect to obtaining static measurements. This is because all the photographic evidence suggests the concrete was poured in a similar time frame and all of it pre-dates the operation of the nuclear plant. Secondly, Shonka Research Associates, under SR-80 and SR-84, meticulously surveyed (100% coverage) both the Penelec warehouse pad, the Southwest Garage, and the SSGS footprint and found that the areas surveyed umeet the radiological criteria for license termination" (Reference 3.15). Though there are no surveys of the two concrete pillars, they are included with the warehouse and SSGS concrete because the timeframe in which they were built is similar, if not identical, to that of the warehouse pad and SSGS. The portion of Southwest Garage that resides in OL7-1 is approximately 7 m2 (18 inches by 50 feet) and is not expected to indicate the presence of plant-derived radionuclides due to the aforementioned Shonka surveys. Therefore, it will not be surveyed.

2.1.10 VSP (Reference 3.4) is used to plot all random start asphalt sampling points on the included diagrams. See Attachments 6-1, 6-3, 6-6, and 6-9 for VSP sampling point locations).

2.1.11 Some sampling points may need to be adjusted to accommodate obstructions within the survey area. Contact the SR coordinator to report any difficulties encountered when laying out grid sampling points.

2.1.12 Because of the unusual arrangement of the multiple concrete surfaces in this OL7-1, the drawings in Attachment 6 are intended to be as close as practicable to the as-left conditions. If the actual layout is different from that shown, then review with the cognizant SR coordinator, finish the survey if practicable, and mark up the drawings to indicate actual layout.

2.1.13 When an obstruction is encountered that will not allow collection of a sample, contact the cognizant SR coordinatorfor permission to either move or delete the sampling point.

NOTE If remediation actions are taken as a result of this survey, this survey design must be revised or re-written entirely.

2.2 Measure both fixed point and elevated areas(s) on concrete and asphalt IAW SNEC procedure E900-IMP-4520.04 (Reference 3.2).

3.0 REFERENCES

3.1 SNEC Calculation No. E900-03-018, "Optimize Window and Threshold Settings for the Detection of Cs-1 37 Using the Ludlum 2350-1 and a 44/10 Nal Detector", 8/7/03.

3.2 SNEC Procedure E900-IMP-4520.04, "Survey Methodology to Support SNEC License Termination".

3.3 COMPASS Computer Program, Version 1.0.0, Oak Ridge Institute for Science and Education.

3.4 Visual Sample Plan, Version 3.0, Copyright 2004, Battelle Memorial Institute.

3.5 SNEC Facility License Termination Plan.

SNEC CALCULATION SHEET Calculation Number Revision Number Number E900-05-028 0 Page 6 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 3.6 SNEC Procedure E900-IMP-4500.59, "Final Site Survey Planning and DQA".

3.7 GPU Nuclear, SNEC Facility, "Site Area Grid Map", SNECRM-020, Sheet 1, Rev 4,1/18/05.

3.8 SNEC Calculation No. E900-03-012, Effective DCGL Worksheet Verification.

3.9 SNEC Procedure E900-IMP-4520.06, uSurvey Unit Inspection in Support of FSS Design".

3.10 NUREG-1575, "Multi-Agency Radiation Survey and Site Investigation Manual", August, 2000.

3.11 Microsoft Office Excel, Version 11.0.5612, Microsoft Corporation Inc., 1985-2003.

3.12 SNEC Procedure E900-ADM-4500.39 "Chain of Custody for Samples" 3.13 CV Yard Survey Design - North West Side of CV, E900-04-005.

3.14 SNEC Calculation 6900-02-028, GFPC Instrument Efficiency Loss Study.

3.15 Shonka Research Associates, Inc., "Final Report for SCM Survey of Saxton Nuclear Experimental Corporation", Rev. 1, 3/3/05.

3.16 SNEC FSS Radiological Survey Data Form FSS-1541, 4/27/05.

4.0 ASSUMPTIONS AND BASIC DATA 4.1 The COMPASS computer program is used to calculate the required number of random start systematic samples to be taken in the survey unit (Reference 3.3).

4.2 Data shown on Attachments 8-2 and 8-4 are used as the initial estimates of variability for concrete and asphalt, respectively.

4.3 The MARSSIM Sign Test will be applicable for this survey design. No background subtraction will be performed under this criterion during the DQA phase.

4.4 The Visual Sample Plan (VSP) computer code (Reference 3.4) locates the required number of fixed survey points, determined by COMPASS, on the survey maps for asphalt in each survey unit. Fixed survey points for concrete were chosen independent of VSP.

4.5 References 3.5 and 3.6 were used as guidance during the survey design development phase.

4.6 Background reference for concrete was obtained from the Williamsburg concrete study and is 306 cnm (Attachment 8.1). Asphalt background was determined to be approximately 79 cpm (Attachment 8.3 and Reference 3.16).

4.7 The determination of the physical extent of this area is based on Reference 3.7. The extent of the SSGS footprint was later modified/extended from OL3 into OL7-1 by virtue of a site walkdown on 4/28/05.

4.8 There has been no known remediation in Area OL7.

4.9 This survey design uses Cs-137 as a surrogate for all SNEC facility related radionuclides in the survey unit. The effective DCGLw is the Cs-137 DCGLw from the SNEC LTP (6.6 pCVg) adjusted (lowered) to compensate for the presence (or potential presence) of other SNEC-related radionuclides. In addition, an administrative limit (75%) has been set that further lowers the permissible Cs-137 concentration to an effective surrogate DCGLw for this survey area.

SNEC CALCULATIONSHEET --..  ;  :--: '

Calculation Number Revision Number Page Number E90G-05-028 0 Page 7 of 10 Subject Open Land FSS Design - OL7 Paved Surfaces and Concrete 4.10 The sample database contained only one sample, which was assayed both on site and off site, with which to determine the effective radionuclide mix for Area 0L7. In order to obtain a more representative mix of expected radionuclides, data from OL1 and OL2 were used instead. The decayed set of sample results were input to the spreadsheet titled "Effective DCGL Calculator for Cs-137" (Reference 3.8) to determine the effective volumetric DCGLw values for the survey units, then changed to an equivalent surface contamination level. The output of this spreadsheet is shown on Attachment 2-1 which is copied from Reference 3.13. The spreadsheet was previously reviewed.

The Nal detector scan MDC calculation is determined based on a 25 cm/sec scan rate, a 1.38 index of sensitivity (95% correct detection probability and 60% false positive) and a detector sensitivity, of 205.6 cpm/uR/hr for Cs-137. Additionally, the detection system incorporates a Cs-137 window that lowers sensitivity to background in the survey unit. The asphalt background is approximately 83 cpr in 0L7-1 and 144 cpm in OL7-2.

4.11 The survey units described in this survey design were inspected. A copy of the OL7 specific portion of the SNEC facility post-remediation inspection report (Reference 3.9) is included as Attachments 9-1 through 9-5.

4.12 No special area characteristics including any additional residual radioactivity (not previously noted during characterization) have been identified in this survey area.

4.13 The decision error for this survey design is 0.05 for the a value and 0.1 for the P value.

4.14 "Special measurements", as described in the SNEC LTP sec 5.5.3.4, are not included in this survey design.

4.15 No additional sampling will be performed IAW this survey design beyond that described herein.

4.16 SNEC site radionuclides and their individual DCGLw values are listed on Exhibit 1 of this calculation.

4.17 The survey design checklist is listed in Exhibit 2.

4.18 Area factors are shown as part of COMPASS output (see Attachment 7-1) and are based on the Cs-1 37 area factors from the SNEC LTP.

5.0 CALCULATIONS 5.1 All calculations are performed internal to applicable computer codes or within an Excel spreadsheet.

6.0 APPENDICES 6.1 Attachment 1-1 is a diagram of survey units 0L7-1 and 0L7-2.

6.2 Attachments 2-1 and 2-2 show the DCGL Calculation Logic - CV Yard Soil & Boulders and the Cs-137 Efficiency Loss with Distance from Source study for GFPC probes (Reference 3.13 and 3.14).

6.3 Attachment 3-1 is a copy of the calibration data from typical Nal and GFPC radiation detection instrumentation that will be used in this survey area.

6.4 Attachments 4-1 through 4-3 are the MDCscan calculation sheets for surface materials in dpm/1 00 cm2.

ma ^-r ~' !: - *2; i- . ,, 4 .-a..9Z.. ........-. &

"SM'EC:CALCULATION SHEET ....

Calculation Number Revision Number Page Number E900-05-028 0 Page 8 of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete 6.5 Attachment 5-1 istthe MicroShield dose rate calculation results for a 56.4 cm diameter source at a distance of 5" used, for Nal detector modeling, to determine the exposure rate from a 1 pCi/cm2 Cs-137 source term in a disk geometry.

6.6 Attachments 6-1 through 6-11 show the random sampling points and scan locations, for both concrete and asphalt, and reference coordinates for Survey Units OL7-1 and OL7-2.

6.7 Attachments 7-1 through 7-7 are COMPASS outputs for Survey Units OL7-1 (concrete) and MA8-18 through MA8-21 (asphalt) showing area factors, the number of sampling points in each survey unit, and prospective power.

6.8 Attachments 8-1 through 8-4 show both concrete and asphalt backgrounds and material variability results from OL7 samples.

6.9 Attachments 9-1 through 9-5 are copied from the most recent inspection report for OL7.

SNEC CALCULATION 'SHEET Calculation Number Revision Number Page Number E900-05-028 0 Page 9 of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete Exhibit 1 SNEC Facility Individual Radionuclide DCGL Values (a) 25 mrem/y Limit 4 mrem/y Goal 25 mremly Limit (All Pathways) (Drinking Water)

Radionuclide Surface Area Open Land Areas Open Land Areas (b)

(dpml100cm 2 ) (Surface & Subsurface) (Surface & Subsurface)

(pClg) (pClg)

Am-241 2.7E+01 9.9 2.3 C-14 3.7E+06 2 5.4 Co-60 7.1 E+03 3.5 67 Cs-1 37 2.8E+04 6.6 397 Eu-152 1.3E+04 10.1 1440 H-3 1.2E+08 132 31.1 Ni-63 1.8E+06 747 1.9E+04 Pu-238 3.OE+01 1.8 0.41 Pu-239 2.8E+01 1.6 0.37 Pu-241 8.8E+02 86 19.8 Sr-90 8.7E+03 1.2 0.61 NOTES:

(a) While drinking water DCGLs will be used by SNEC to meet the drinking water 4 mrem/y goal, only the DCGL values that constitute the 25 mrem/y regulatory limit will be controlled under this LTP and the NRC's approving license amendment.

(b) Listed values are from the subsurface model. These values are the most conservative values between the two models (i.e.,

surface & subsurface).

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-028 0 Page 10 of 10 Subject Open Land FSS Design - 0L7 Paved Surfaces and Concrete Exhibit 2 Survey Desiqn Checklist Calculation No. Location Codes E900-05-028 OL7 ITEM IT M E IE REVIEW FOCUS OC SStatus (Circle One)

Reviewer initials & Date 1 Has a survey design calculation number been assigned and is a survey design summary description provided?

2 Are drawings/dIagrams adequate for the subject area (drawings should have compass N/A 2reAdr aw ngs/ iagr a s ad quat for headings)? ' s N/

3 Are boundaries properly identified and is the survey area classification clearly indicated? Y, N/A 4 Has the survey area(s) been properly divided into survey units lAW EXHIBIT 10 e N/A 5 Are physical characteristics of the areatlocation or system documented? 5 N/A 6 Is a remediation effectiveness discussion included? Y; N/A Have characterkation survey and/or sampling results been converted to units that are ( 5>HM N/A

.

comparable to applicable DCGL values?  ; o* I-8 Is survey and/or sampling data that was used for determining survey unit variance included? (; N/A Is a description of the background reference areas (or materials) and their survey and/or -: N/A 5 sampling results included along with a justification for their selection? s,____>

10 Are applicable survey and/or sampling data that was used to determine vaniability included? OeN/A t1 Will the condition of the survey area have an impact on the survey design, and has the N/A / f probable impact been considered in the design? esL N Has any special area characteristic including any additional residual radioactivity (not 12 previously noted during characterization) been identified along with its impact on survey Yesb .J/ TJ preioslnoeddudesign?Ye6 13 Are all necessary supporting calculations and/or site procedures referenced or included? Y (Ye , N/A .

• j 14 Has an effective DCGLw been identified for the survey unit(s)? N/A is Was the appropriate DCGI-Eac included in the survey design calculation? ( +/-'

16 Has the statistical tests that will be used to evaluate the data been identified? e N/A 5j4%

17 Has an elevated measurement comparison been performed (Class 1 Area)? Yes 18 Has the decision error levels been identified and are the necessary justifications provided? N/A 19 Has scan instrumentation been identified along with the assigned scanning methodology? e N/A - /A/4^

20 Has the scan rate been identified, and is the MDCscan adequate for the survey design? N/A 21 Are special measurements e.g., in-situ gamma-ray spectroscopy required under this design, and is the survey methodology, and evaluation methods described? Yes,PIJ 22 Is survey instrumentation calibration data Included and are detection sensitivities adequate? ,Yos N/A 23 Have the assigned sample and/or measurement locations been clearly identified on a diagram .

or CAD drawing of the survey area(s) along with their coordinates? N/A 24 Are investigation levels and administrative limits adequate, and are any associated actions ( N/A

_ _clearly Indicated? N/

25 For sample analysis, have the required MDA values been determined.? e, N/A 26 Has any special sampling methodology been identified other than provided in Reference 6.3? Y e, r NOTE: a copy of this completed form or equivalent, shall be included within the survey design calculation.

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Effoctive DCGL Calculator for Cs-137 (dpml1lO IcmA2) Gross Activity DCGLw Gross ActivityAdministrative Llmit 44434 IiJmIlflncmA2 33325 IdpmrlnO cmA2 l -25.0 ilrOmly TEDE l lmlt CS.137 Limit Cs-137 Admilnistraive Limit SAMPI E tlls). It;V YARD SOIL. & f1t11.11E SAMPLES I 26445 ljdpmMlDO cm^2 19834 (lmitnn cmA2 I SNEC AL 1 75% D

.

Samplo Inpuit Ind ividulal UmnilA Allowod dpm/l1O B3eta dpmrlMO Alpha dpml1OO Itwtot)pc (pCIIg. iiCI, eai.)  % of Total Idpmin/In crn42) cm11A2 mremly TEDE cm^2 cjmjA 2 1 Am-241 O.D00% 27 0.00 0.00 HIA 0.00 Arn-241 2 C-14 0.000% 3,700,000 0.00 0.00 . 0.00 rA C-14 3 C.o-60 6.25E n3 0.443% 7,100 196.87 0 69 196.87 lilA Co-60 4 Cs-137 8.4fE-01 59.S15% 28,000 26444.8f8 23.61 26444.7 UIA Cs-137 5 Ett-152 0.000% 13,0n0 0.00 0.00 n.00 HI/A Eit-152 6 11-3 5,57E-n1 39.500% 120,0100,000 17551.45 0.00 tnot Delectabla HIA 11-3

, Ni-63 0.000% 11800,000 0.00 0.00 Ifnn Detectable 111A NI-63 a Pu-23B 0.00071% 30 0.00 0.00 WilA 0.00 P1t-238 u Pii-239 _0.000% 28 o.00 0.00 rIJA 0.00 Pit-239 t) Pit-241 0.000% 8n0 0.00 0.00 laot Delectable lIlA Pti-241 t I Sr-90 7.64E-03 0.542% 6,700 240.75 0.69 240.75 l,/A Sr-90 10n.000%. 44434 25.0 26882 a MaxinmItn Pennissible dpml1DD cm^2 7AC-ra(+mEN7-T I-

I.B SBM rpm It Cs-1 37 Efficiency Loss with Distance From Source 1.0

_ >N

• _M Data: DatallLoss Model: ExpDecayl ChiA2 = 0.0001 8 0.8 -

yO 0.03536 +/- 0.02118 CU xO 0 +/-0 LL A1 1.00693 +/-0.01 809 U- K./ ti 1.61 706 +/-0.07558 CD

._ 0.6 -g C)

(D w

=

1. 4 Fit = yO+A1 eA(_(XXo)It1) 0.4 -4

---

K-61 _--= -----

0.2 -'9 1 2 2 3 .

0.0 0.5 1.0 1.5 2.0 2.5 3.0 Inches from 150 cm2 Source

a50INSIRUMENT AND PROBE EFFICIENCY CHART 7/01/04 (Typical 2" by 2" Nal (Cs-137 W) Conversion Factors)

Inst.# Cal Due l AP # I Probe i Cal Due cpm/mRlh 98625 .tl 8.05 l R 21Y 1168 Pk l 5/18 2l4.882 F

1 -- 74 98647_i 1 5/18/(5 I __2 I 12 167PetrlRlnt 1667 Pk 51I8/liX,

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126183 1 11/19/04 J B&R l l) 206280 Pk 12/12/04 190,907

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________ ' - .sj. .J_. -2L-5 21 1.79i 2350 INSTRUMENT AND PROBE EFFCEENCY CHART 7/I04----(ypical 43;68Beta Eticliency Factors)

IDiffa:t nisrumenPmbc CJI DU I 11nlXnflfm I'1,11Ww. !IN,

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7 0fl27 nAln cJnr I Pt/ V.;JI/U L=.hUlIG J .1 N/A

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1 12 1 8 8 4 UW4EM31U-'

Ia I 126188 1/27/05- 0991&5 127/05" 28.20% N/A 1326218' 01/08/05 09508( ) 01/09/0j5 . _ 2.9% I N/A;.

1477-f/Ce/733-/

Gas Flow Proportional Counter (GFPC) Scan MDC Calculation IMDCscan = 1781 dpm/100 cm2 for Concrete in OL7-1 I 7

b = background (cpm) bi = background counts in the observation interval (counts) p = human performance adjustment factor (unitless) d = index of sensitivity from MARSSIM table 6.5 based on 95% detection and 60% false positive SR = Scanning movement rate (cmlsec)

Wd = width of probe (cm)

A = probe area (cm2 )

Ei = gas flow proportional detector / meter calibrated response (cpm/dpm)

Es = 2 pi source efficiency (emissions/disintegration)

ECF = Efficiency Correction Factor for surface roughness (see Attachment 2-2)

Oi = Observation interval (seconds)

MDCRi = Minimum Detectable Count Rate in (ncpm)

MDCscan = Minimum Detectable Concentration for scanning (pCUcm 2 )

DCDLeq = net count rate equivalent to the adjusted DCGL (ncpm) b= 360 cpm d= 1.38 SR = 10 cm Wd = . cm A= lm126 cr Ei== 0.478 cpm/dpm Es= 0.5= ECF = 0.57 DCGL = 19834 dpm/100 cm2 Wd = 0.8800 = Oi (sec)

SR b*Oi =

• 5.2800 = bi (counts) 60 seclmin d'sqrt(bi*60 = 216.2044 = MDCRi (ncpm)

Oi MDCRi + b = 576.2044 = gross cpm at the MDCRi MDCRi 1781.2969 = MDCscan (dpml100 cm 2 )

Ei*Es*ECF*(A/100)*sqrt(p)

DCGL*Ei*Es*ECF*(A/1 00) = 3404.5021 = DCGLeq (ncpm)

A-r-C6(f4WFN c, I

Nal Scan MDC Calculation IMDCscan = 5502 dpm/1 00 cm 2 for Asphalt in 0L7-1 I I

b = background (cpm) bi = background counts in the observation interval (counts)

Conv = Nal detector/meter calibrated response (cpm per uR/hr) d = index of sensitivity from MARSSIM table 6.5 based on 95% detection and 60% false positive HSd = elevated measurement spot diameter (centimeters)

MDCscan = Minimum Detectable Concentration for scanning (pCicm 2)

MDCRi = Minimum Detectable Count Rate in (ncpm)

MDCRsurv = MDCRi adjusted for the human performance factor p (ncpm)

MDER = Minimum Detectable Exposure Rate (uR/hr)

MSoutput = MicroShield derived exposure rate for 1 pCicm2 of contaminant (mR/hr)

Oi = Observation interval (seconds) p = human performance adjustment factor (unitless)

SR = Scanning movement rate (cmlsec)

DCDLeq = net count rate equivalent to the adjusted DCGL (ncpm) b= 82.5 cpm p=r 0.5 HSd = 56.4 cm SR= 25 cm d=l 1.38 Conv = r 205.6 Icpm/uR/hr MSoutput = i .794E-05 mR/hr per pC/cm2 DCGL = 19834 dpm/100 cm 2 HSd = 2.2560 = Oi (sec)

SR bOi = 3.1020 = bi (counts) 60 sec/min d-sqrt(bi)60 = 64.6416 = MDCRi (ncpm)

Oi MDCRi = 91.4170 = MDCRsurv (ncpm) sqrt(p)

MDCRsurv = 0.4446 = MDER (uR/hr)

Conv MDER 24.7846 = MDCscan (pC/cm2 )

MSoutput*1000 uRlmR or 5502.177 dpm/100 cm 2 MDCsurv*DCGL = 329.5360 = DCGLeq (ncpm)

MDCscan hT~Ap{m~.iT- #4;-2.

Nal Scan MDC Calculation IMDCscan = 7277 dpm/100 cm2 for Asphalt in oL7-2 I I

7 b = background (cpm) bi background counts in the observation interval (counts)

Conv = Nal detector/meter calibrated response (cpm per uR/hr) d = index of sensitivity from MARSSIM table 6.5 based on 95% detection and 60% false positive HSd = elevated measurement spot diameter (centimeters)

MDCscan = Minimum Detectable Concentration for scanning (pCi/cm 2 )

MDCRi = Minimum Detectable Count Rate in (ncpm)

MDCRsurv = MDCRi adjusted for the human performance factor p (ncpm)

MDER = Minimum Detectable Exposure Rate (uR/hr)

MSoutput = MicroShield derived exposure rate for 1 pCicm2 of contaminant (mR/hr)

Oi = Observation interval (seconds) p = human performance adjustment factor (unitless)

SR = Scanning movement rate (cm/sec)

DCDLeq = net count rate equivalent to the adjusted DCGL (ncpm) b= 144.3 cpm HSd = 56.4 cm SR= 25 cm d= 1.38 Conv = l 205.6 lcpm/uR/hr MSoutput = .794E-05 lmR/hr per pCicm2 DCGL = 19834 dpm/100 cm2 HSd = 2.2560 = Oi (sec)

SR b*Oi = 5.4257 = bi (counts) 60 sec/min d*sqrttbi)*60 = 85.4906 = MDCRi (ncpm)

Oi MDCRi = 120.9020 = MDCRsurv (ncpm) sqrt(p)

MDCRsurv = 0.5880 = MDER (uR/hr)

Conv MDER 32.7784 = MDCscan (pCVcm 2 )

MSoutput*1000 uR/mR or 7276.805 dpm/100 cm2 MDCsurv*DCGL = 329.5360 = DCGLeq (ncpm)

MDCscan IrI`T"MEHT ((P-*3

MicroShield v5.05 (5.05-00121)

GPU Nuclear Page :1 File Ref:

DOS File: MCADAM.MS5 Date:

Run Date: April 19, 2005 By:

Run Time: 11:56:22 AM Checked:

Duration : 00:00:00 Case Titie: Small Surface Area

Description:

Macadam Surface Geometry: 3 - Disk Source Dimensions Radius 28.2 cm 11.1 in

_x Dose Points x Y z

1. 1 12.7 cm 0cm 0cm 5.0 in 0.0 in 0.0 in Shields Shield Name Material Densitv Air Gap Air 0.00122 Source Input Grouping Method : Actual Photon Energies Nuclide curies becquerels uCi/cm 2 BgI/CM 2 Ba-1 37m 2.3634e-009 8.7446e+001 9.4600e-007 3.5002e-002 Cs-1 37 2.4983e-009 9.2438e+001 1.00OOe-006 3.7000e-002 Buildup The material reference is : Air Gap Integration Parameters Radial 60 Circumferential 60 Results Energy Activity Fluence Rate Fluence Rate Exposure Rate Exposure Rate MeV photons/sec MeV/cm 2lsec MeV/cm 2 /sec mR/hr mR/hr No Buildup With Buildup No Buildup With Buildup 0.0318 1.81 Oe+00 1.018e-05 1.028e-05 8.483e-08 8.561 e-08 0.0322 3.340e+00 1.901e-05 1.919e-05 1.530e-07 1.544e-07 0.0364 1.216e+00 7.831e-06 7.903e-06 4.450e-08 4.490e-08 0.6616 7.868e+01 9.256e-03 9.271e-03 1.794e-05 1.797e-05 TOTALS: 8.505e+01 9.293e-03 9.309e-03 1.823e-05 1.826e-05 A77AQ/I/4CEf17 I

Survey Unit 01L7-1 (Penelec Warehouse) pad, ramp, steps, and exterior foundation walls

- - -.- - L /1 I I l lI AN  ;

4 AO Reference point for 1, 2, and 3 Trailers, sheds 129 13 Decking 128 131 Ed Accessible areas, walkways A - see Attachment 6.2 for Penelec warehouse sump (pad is bounded approximately by grids A0131, A0128, AM128, and AM131)

N

. . .

f.';

t -.s AA$1 1s"1 r7- & -i rT4'

. 'e, Y.

I ...

Survey Unit 0L7-1 (Penelec Warehouse Sump)

I.

I .. i i .

., 1 1 1.04 m I I'

. Ii' I i

.' 1.75m I I

I IF 0.I m l 0.76 m Sump in grids AN131 and AO131 A-frPffMC-K7- 4:,-Z

Survey Unit 0L7-1 (SSGS concrete)

AQ135 AQ132

\S (I 7

0 0 4: 4n /I A0135 0 ---- A 13

. .1' ATTACN'417/ eo-3 , f.j.t

Concrete Scan Survey and Fixed Point Measurement Grids for Survey Unit 0L7-1 VSP provides survey points using a scale relative to the southwestern comer of the survey unit. This is cumbersome as field personnel must measure over large distances (sometimes hundreds of meters) from the single reference point. To remedy this situation, this spreadsheet provides the VSP survey points based on the actual location within each grid.

Unless described otherwise, to identify the fixed point survey locations, start at the grid identifier below left. Go east the number of meters under the "E" column and then move north the number of meters in the "N" column. For simplicity, all measurements have been rounded to the nearest meter.

To complete scan surveys, use the 15 scan locations listed below the static measurement locations.

These grids and partial grid areas should be scanned 100%.

Y X Grid S W coordinate coordinate Location ID (meters) (meters) (meters) (meters) 1 AM129 14* 2.3* 14.0179 2.2778 2 AM129 14* 10.5* 14.0179 10.5079 3 AN129 6.9* 6.4* 6.8905 6.3929 4 AM131 ** A*

14.0179 35.1981

• The first three points are measured from the reference point on Attachment 6.1 (NE comer of pad)

• • Measure 4.7m from the south end of the south stairs, then 0.2m down from the top of the pad E 1J X*** Y***

Grid hw:i..,.# ,E-If coordinate coordinate

-

Location ID (meters) (meters) (meters) J.""f

.,Ai o'-sill'I 5 AP134 0.5 8.1 10.4966 18.1095 6 AP134 8.7 8.1 18.7267 18.1095 '/' , .1;-- '" , ,'-? I,-,A 7 AP133 6.9 8.1 26.9568 18.1095 4 J'1,1111 -P 'rer 8 AP135 6.4 1 6.3816 10.9821 9 AP134 4.6 1 14.6177 10.9821 1,7e, '90r 10 AP133 2.9 1 22.8717 10.9821 11 AP132 1.1 1 31.0718 10.9821

• • • Original coordinates were referenced to the concrete slab itself. The north and east coordinates are referenced to the actual grid ID. The offset is 2.5m in the X and 5m in the Y-direction Scan Grid Scan Grid Scan Grid

-

Location ID Location ID Location ID 1 AM131 6 AN129 11 AR120 2 AM130 7 A0131 12 AP134 3 AM129 8 A0130 13 AP132 4 AN131 9 A0129 14 A0135 5 AN130 10 AR121 15 A0133 ATrfAci*A N &75

Survey Unit 0L7-1 (Concrete Pillars)

Concrete pillar - grid AR121 0.775 m 0 10.533 m.

1.98 m north east south west top Concrete pillar - grid AR120 1 0.762mr I 10.533 ml 2.15 m

. I

,.4 .! .~. ..

north east south west top ATT7Ae-4#f&7-r (Co-4'

C;urvey Unit 0L7-1 (asphalt surfaces)

MA8-18 north of the AN line MA8-19 south of the AN line AP1 35 AP1 32 (CtI X1~

2) -' X 1) (n)

I

,{1 I 4'-

MA8-18 c-I

• R AN line MM AN line MA8-19 /if r,

+_1 111l'11]

(DI)

+-:

--7(i!;

,- AL131

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A4-rrkf/mF1A7 eo-<

Asphalt Scan Survey and Fixed Point Measurement Grids for Survey Unit OL7-1 0L7-1 is broken down into MA8-1 8 and MA8-19 because of structural size restgrictions delineated in MARSSIM T VSP provides survey points using a scale relative to the southwestern comer of the survey unit. This is cumbersome as field personnel must measure over large distances (sometimes hundreds of meters) from the single reference point. To remedy this situation, this spreadsheet provides the VSP survey points based on the actual location within each grid.

To identify the fixed point survey locations, start at the grid identifier below left. Go east the number of meters under the "E' column and then move north the number of meters in the "N" column. For simplicity, all measurements have been rounded to the nearest tenth of a meter.

To complete scan surveys, use the scan locations listed below each set of static measurement locations. These grids and partial grid areas should be scanned 100%.

MA8-18 scan and fixed point measurement locations X Y Grid E N coordinate coordinate Location ID (meters) (meters) (meters) (meters) 1 AN136 6.4 3.5 6.4163 23.547 2 AN135 5.6 3.5 15.6445 23.547 3 AN134 4.9 3.5 24.8728 23.547 4 AN133 4.1 3.5 34.101 23.547 5 AN132 3.3 3.5 43.3292 23.547 6 A0136 1.8 1.5 1.8022 31.5388 7 A0135 1 1.5 11.0304 31.5388 8 A0134 0.3 1.5 20.2587 31.5388 9 A0133 8.7 1.5 38.7151 31.5388 10 A0132 7.9 1.5 47.9433 31.5388 11 A0131 2.6 9.5 52.5574 39.5307 Scan Grid Scan 'Grid Scan Grid Location ID Location ID Location ID 1 AN136 3 AN132 5 A0133 2 AN134 4 A0135 6 A0131 7 AP132 ArTTAC4OsM &-

MA8-19 scan and fixed point measurement locations X Y Grid E N coordinate coordinate Location ID (meters) (meters) (meters) (meters) 1 AL136 6.4 ' 7.6 6.4163 7.5632 2 AL135 5.6 7.6 15.6445 7.5632 3 ALl 34 4.9 7.6 24.8728 7.5632 4 AL133 4.1 7.6 34.101 7.5632 5 AL132 3.3 7.6 43.3292 7.5632 6 AM136 1.8 5.6 1.8022 15.5551 7 AM135 1 5.6 11.0304 15.5551 8 AM134 0.3 5.6 20.2587 15.5551 9 AM134 9.5 5.6 29.4869 15.5551 10 AM133 8.7 5.6 38.7151 15.5551 11 AM132 7.9 5.6 47.9433 15.5551 Scan Grid Scan Grid Scan Grid Location ID Location ID Location ID 1 AL136 3 AL132 5 AM133 2 AL134 4 AM135 6 AM131

,A-rAC"+'5NT C.i-g

Survey Unit 0L7-2 (asphalt surfaces)

MA8-20 west of 127 line MA8-21 east of 127 line AL133 0 0 0 0 0 co C, 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0 0

°0 i °o

° o o 0 0 0 o e) o C> o o °0 ° ° 0 0 AF129 127 l<ne < AC127line 0 - o 0 0 0 0 b-t - C--T.-

ATT/Vfl1E4T- eco-?

Asphalt Scan Survey and Fixed Point Measurement Grids for Survey Unit 0L7-2 0-7-2 is broken down into MA8-20 and MA8-21 because of structural size restgrictions delineated in MARSSIM t VSP provides survey points using a scale relative to the southwestern comer of the survey unit This is cumbersome as field personnel must measure over large distances (sometimes hundreds of meters) from the single reference point To remedy this situation, this spreadsheet provides the VSP survey points based on the actual location within each grid.

To identify the fixed point survey locations, start at the grid identifier below left. Go east the number of meters under the "E" column and then move north the number of meters in the "N" column. For simplicity, all measurements have been rounded to the nearest tenth of a meter.

To complete scan surveys, use the scan locations listed below each set of static measurement locations. These grids and partial grid areas should be scanned 100%.

MA8-20 scan and fixed point measurement locations X Y Grid E N coordinate coordinate Location ID (meters) (meters) (meters) (meters) 1 AK135 3.5 8.3 3.4762 98.2713 2 AK135 7.9 0.6 7.9038 90.6024 3 AJ134 2.3 2.9 12.3315 82.9335 4 A1134 6.8 5.3 16.7592 75.2645 5 AH133 1.2 7.6 21.1868 67.5956 6 AG133 5.6 9.9 25.6145 59.9266 7 AF131 3.3 4.6 43.3252 44.5888 8 AE131 7.8 6.9 47.7528 36.9198 9 AE130 6.6 6.9 56.6082 36.9198 10 AD129 1 9.3 61.0358 29.2509 11 AD129 9.9 9.3 69.8912 29.2509 Scan Grid Scan Grid Scan Grid Location ID Location ID Location ID 1 AK134 4 A1132 7 AF131

.2 AJ135 5 AH133 8 AE130 3 A1134 6 AG132 9 AE128 10 AD129 ATrM4EPT G&IQ

MA8-21 scan and fixed point measurement locations X y Grid E N coordinate coordinate

-

Location ID (meters) (meters) (meters) (meters) 1 AD127 3.2 v 1.6 83.1742 21.5819 2 AD126 2 1.6 92.0295 21.5819 3 AC125 5.3 3.9 105.3125 13.913 4 AC124 4.2 3.9 114.1678 13.913 5 AC123 3 3.9 123.0232 13.913 6 AC122 1.9 3.9 131.8785 13.913 7 AC121 0.7 3.9 140.7338 13.913 8 AC121 9.6 3.9 149.5891 13.913 9 ABI 18 1.7 6.2 171.7275 6.244 10 AB1 17 0.6 6.2 180.5828 6.244 11 AB1 17 9.4 6.2 189.4381 6.244 Scan Grid Scan Grid Scan Grid

- Location ID Location ID Location ID 1 AD127 4 AC122 7 A8121 2 AC126 5 AC120 8 AB119 3 AC124 6 AC118 9 AB1 17 AA4ME00987 ~a-I

Site Report Site Summary Site Name: OL7 paved Planner(s): Tristan M. Tritch Contaminant Summary NOTE: Surface soil DCGLw units are pCVg.

Building surface DCGLw units are dpm/100 crnm.

Screening Cont aminant Type DCGLw Value Used? Area (m') Area Factor Cs-1 37 Building Surface 19,834 No 1 11.2 4 3.7 9 2.2 16 1.5 25 1.2 36 1 COMPASS V1.0.0 4125/2005 Page 1 AT-rA4(+AFsmr i-1

I NU Building Surface Survey Plan Survey Plan Summary Site: 0L7 paved Planner(s): Tristan M. Tritch Survey Unit Name: 0L7-1 Concrete Comments: Warehouse (pad, sump, walls) and concrete pillars Area (m2 ): ,M82 990 ' Classification: 2 Selected Test: Sign Estimated Sigma (cpm): 54.9 DCGL (cpm): 3,499 Sample Size (N): 11 LBGR (cpm): 3,335 Estimated Conc. (cpm): 59 Alpha: 0.050 Estimated Power 1.00 Beta: 0.100 Prospective Power Curve I 1-

_ _ __ _ _ _ _ _ _ _- I

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0.5 I-0.4 :1 I -_ __ - ____ __ - - ___

03 -

=__- _ -- _I _3 02 0.1 0

0 500 1000 1500 2000 2500 3000 3500 4000 Net Beta (cpm)

- Poi wer - DCGL M- Estibated Power

- LEB R 1-beta COMPASS v1.0.0 4J2612005 Page 1

,ffcr zM F-H 1-z

Building Surface Survey Plan Contaminant Summary DCGLw Contaminant (dpml100 cm')

Cs-137 19,834 Beta Instrumentation Summary Gross Beta DCGLw (dpm/100 cm2): 19,834 Total Efficiency 0.14 Gross Beta DCGLw (cpm): 3,499 ID Type Mode Area (cm')

1 GFPC Beta 126 Contaminant Energy' Fraction' Inst. Eff. Surf. Eff. Total Eff.

Cs-137 187.87 1.0000 0.24 0.60 0.1434

'Average beta energy (keV) [N/A indicates alpha emission]

Activity fraction Gross Survey Unit Mean (cpm): 365

• 43 (1-sigma)

Count Time (min): I Number of Average Standard MDC Material BKG Counts (cpm) Deviation (cpm) (dpml100 cm')

concrete 31 306 34.5 478 vl.0.0 COMPASS v1.0.0 4126/2006 Page 2 COMPASS 4126/2005 Page 2 TA~rANT- 7

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.4 .,-3,14, -.,"'-It Tle-'-P -1111.iAF; BBuilding Surface Survey Plan Survey Plan Summary Site: 0L7 paved Planner(s): Tristan M. Tritch Survey Unit Name: 0L7-1 Asphalt Surface (MV °-? 1) M Comments: Asphalt pad west of old Penelec warehouse Area (M2 ): 1,550 Classification: 2 Selected Test Sign Estimated Sigma (cpm): 35.8 DCGL (cpm): 397 Sample Size (N): 11 LBGR (cpm): 290 Estimated Conc. (cpm): 3.2 Alpha: 0.050 Estimated Power 1.00 Beta: 0.100 Prospective Power Curve I

os i p.

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0.6 I I I 0.5 I

0.4 i a.

03

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- I 0.1 -1 I

0 I I 0 50 100 150 200 250 300 350 400 450 NetBeta(cpm)

- Power - DCG. - - Estiated Power

- LBGR M I-beta COMPASS Vl.0.0 4127/2005 Page I ATrAWAOE~T 74q

.I -&:;L-14"j , I

- " '!:7"T. -'

Building Surface Survey Plan Contaminant Summary DCGLw Contaminant (dpml100 cm2)

Cs-I 37 19.834 Beta Instrumentation Summary Gross Beta DCGLw (dpm/100 cm2): 19.834 Total Efficiency: 0.02 Gross Beta DCGLw (cpm): 397 ID Type Mode Area (cm 2) 3 Sodium lodide(NaI) Beta 100 Contaminant Energy' Fraction' InsL Eff. Surf. Eff. Total Eff.

Cs-137 187.87 1.0000 0.02 1.00 0.0166

' Average beta energy (keV) [N/A indicates alpha emission]

2 Activity fraction Gross Survey Unit Mean (cpm): 83* 30 (1-sigma)

Count Time (min): 1 Number of Average Standard MDC Material BKG Counts (cpm) Deviation (cpm) (dpml100 cm 2) asphalt 3 79.3 19.6 2.220 Pae_

CO PS

_ _1720 l. 412712005 Page 2 COMPASS v1.0.0 TrAaMgwlr 07-5

'\Y/ Building Surface Survey Plan Survey Plan Summary, Site: OL7 paved Planner(s): Tristan M. Tritch Survey Unit Name: OL7-2 Asphalt Surface Q AA, -20 pn¢ (iA?-Zt)

Comments: Old access road Area (m2): 1,503 Classification: 2 Selected Test: Sign Estimated Sigma (cpm): 33.7 DCGL (cpm): 397 Sample Size (N): 11 LBGR (cpm): 300 Estimated Conc. (cpm): 65 Alpha: 0.050 Estimated Power: 1.00 Beta: 0.100 Prospective Po%ver Curve 0.7 00.6

.84_ _ _ _ _ _ _ _ _

_ _ _

03

02 _

0.1 = = ==_

50 100 ISO 200 250 300 350 400 450 Net Betz (cpm)

Power DC - - Esthnated Power

-LB6R

• 1-beta COMPASS vI.0.0 412712005 Page 1 A7rAC4MEA'r f7,-';'

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!T Building Surface Survey Plan Contaminant Summary DCGLw 2

Contaminant (dpm/100 cm )

Cs-1 37 19,834 Beta Instrumentation Summary Gross Beta DCGLw (dpm/i00 cm2 ): 19,834 Total Efficiency: 0.02 Gross Beta DCGLw (cpm): 397 ID Type Mode Area (cm')

3 Sodium lodide(Nal) Beta 100 Contaminant Energy 1 Fraction 2 Inst. Eff. Surf. Eff. Total Eff.

Cs-137 187.87 1.0000 0.02 1.00 0.0166 Average beta energy (keV) [NIA indicates alpha emission]

2 Activity fraction Gross Survey Unit Mean (cpm): 144 +/- 27 (1-sigma)

Count Time (min): 1 Number of Average Standard MDC Material BKG Counts (cpm) Deviation (cpm) (dpm/100 cm')

asphalt 3 79.3 19.6 2,220 COMPASS vl.0.0 412712005 Page 2

/kTTk.fMF-Nr 7-7

Williamsburg Concrete Background Measurements 37122N21 Instrument 95348 RLM6220 Time Detector Counts Count Time (sec) Mode Designator FSS-001 BHB 0 BKGND 1/4/2002 8:52 1 7.Z5E+03 18000 SCL hnal Background p 1 Source Check 11412002 9:07 1 1.79E+05 60 SCL Source 33 2 BKGND 1/412002 10:05 2 4.40E.01 1800 SCL Inital Background a Cacyauf CFfcpe,) "r--0w 14 Source Chedc 1/412002 10:39 2 1.51E.05 60 SCL Source a Shielded Unshielded 15 CONAIS 1/4/2002 13:00 1 2.78E+02 60 SCL Shielded 2.78E+02 _____

18 CON AU 1/412002 13:02? 1 3.88E.02 60 SCL Unshielded 0 .

17 CON A2S 1/4J2002 13:20 1 2Z39E+02 60 SCL Shielded a 2.39E+02 _____

18 CON A2U 1/4J2002 13:21 1 2.22E+02 60 SCL Unshielded a .

19 CON A3S 114J2002 13:28 1 2.39E+02 60 SCL Shielded _ 2,39E+02 _____

20 CON A3U 1/412002 13:30 1 2.62E+02 60 SCL Unshielded a .

21 CON A45 1/412002 13:36 1 2.45E+02 60 SCL Shielded a 2.45E+02 22 CON A4U 1412002 13:38 1 2.71E+02 60 SCL Unshielded Q *:::::2.71 E+02 23 CON ASS 1/4/2002 13:58 1 2.OoE+02 60 SCL Shielded a 2.OOE+02 _____

24 CON A5U 1/412002 14:00 1 2.82E+02 60 SCL Unshielded a 2.82E.02 25 CON A6S 1/4/2002 14:03 1 1.84E+02 60 SCL Shielded 1.84E+02 _____

26 CON A6U 1/4J2002 14:05 1 3.10E+02 60 SCL Unshielded a ________. 3.1OE.02 27 CON A75 1/412002 14:09 1 1.98E+02 60 SCL Shielded 1.98E+02 14:10 1 3.15E+02 60 SCL Unshielded B .*.*.. . 3.15E+02 .

28 CON A7U 11412002 29 CON A8S 1/4/2002 14:19 1 2.34E+02 60 SCL Shielded a 2.34E+02 30 CON A8S 1/4J2002 14:22 1 2.31E+02 60 SCL Shielded P 2.31 E+02 31 CON A8U 1/4/2002 14:24 1 2.88E+02 60 SCL Unshielded a * .** 2.88E+02 32 CON A9S 1/4/2002 14:31 1 2.65E+02 60 SCL Shielded 2,65E.02 33 CON A9U 1/4/2002 14:33 1 2.89E+02 60 SCL Unshielded a * .*...2.8SE+02 34 CON A10S 1/4/2002 14:42 1 2.46E+02 60 SCL Shielded a 2.46E.02 _____

35 CON A1OU 1/412002 14:43 1 3.18E+02 60 SCL Unshielded a 3.16E+02 36 CONAI1S 1/4/2002 15:10 1 1.95E+02 60 SCL Shielded a 1.95E+02 37 CONA11U 1/4/2002 15:12 1 2.94E+02 60 SCL Unshielded a K 2.94E+02 .

38 CON A12S 114/2002 15:13 1 2.21E+02 60 SCL Shielded 2.21 E+02 _____

39 CON A12U 114/2002 15:14 1 2.84E+02 60 SCL Unshielded a 2.84E+02 40 CON A13S 1/4/2002 15:23 1 1.74E+02 60 SCL Shielded a 1.74E+02 _____

11412002 15:24 1 2.94E+02 60 SCL Unshielded P 2.94E+02 .

41 CON A13U 42 CON A14S 1/4/2002 15:25 1 1.96E+02 60 SCL Shielded B 1.96E+02 _____

43 CON A14U 1/412002 15:26 1 3.33E+02 60 SCL Unshielded B .

44 CON A15S 1/412002 15:28 1 2.16E+02 60 SCL Shielded a 2.16E+02 ...........

3.45E+02 60 SCL Unshielded a  : 3.45E.02 .

45 CON Al5U 1/4/2002 15:29 1 46 CON Al1S 114/2002 15:30 1 1.83E+02 60 SCL Shielded 1.83E+02 _____

47 CON A16U 11412002 15:31 1 3.13E+02 60 SCL Unshielded  :....... 3.13E.02 .

48 CON A175 1/412002 15:33 1 1.82E+02 60 SCL Shielded 1.82E+02 _____

49 CON A17U 1/4/2002 15:34 1 3.22E+02 60 SCL Unshielded a ...... 3.22E+02 50 CONA18S 1/4/2002 15:35 1 1.84E+02 60 SCIL Shielded a 1.84E+02 CON A18U 1/4/2002 15:36 1 3.24E+02 60 SCL Unshielded B .

51 52 CON A195 1/4/2002 15:37 1 1.91E+02 60 SCL Shielded a 1.91 E+02 ____

53 CON A19U 1/412002 15:39 1 3.07E+02 60 SCL Unshielded B 3.07E+02 54 CON A205 1/412002 15:40 1 1.94E+02 60 SCL Shielded B 1.94E+02 ____

55 CON A20U 114/2002 15:41 1 3.33E+02 60 SCL Unshielded_ 3.33E+02 56 57 CON A215 CON A21U 1/412002 114)2002 15:57 15:58 1

1 1

223E+02 2.92E+02 1.72E+02 60 80 60 SCL SCL SCL Shielded Unshlelded Shielded 9 2.23E+02 1.72E+02

~-~

_____

2.g2E402 .

58 CON A22S 1/1W2002 15:59 _____

59 CON A22U 1/4/2002 16:00 1 2.80E.02 60 SCL Unshielded .

60 CON A23S 1/412002 16:01 1 1.94E+02 60 SCL Shielded 1.94E+02 61 CON A23U 1/412002 16:02 1 3.29E+02 60 SCL Unshielded a 3.29E.02 .

62 CON A24S 1/412002 16:04 1 1.87E+02 60 SCL Shielded B 1.87E+02 _____

63 CON A24U 1/412002 16:05 1. 3.48E+02 60 SCL Unshielded _

64 CON A25S 114/2002 16:06 1 Z07E+02 60 SCL Shielded a 2.07E+02 65 CON A25U 1/412002 16:07 1 3.72E+02 60 SCL Unshielded a 68 CON A27S 11412002 15:09 1 Z09E+02 60 SCL Shielded B 2.09E+02 _____

67 CON A26U 1/412002 16:10 1 3.26E+02 60 SCL Unshielded .

68 CON A275 1/4/2002 16:11 1 Z07E+02 60 SCL Shielded 2.07E.02 _____

69 CON A27U 1/412002 16:12 1 3.30E+02 ea SCL Unshielded 3.30E+02 2.30E.02 ____

3.06E+02 71 CON A28U 1/412=2 16:15 1 Z586E+02 eo SCL Unshielded B 2.13E+02 _____

2.58E+02 74 CON A30S 114/2002 16:24 1 Z.33E+02 so SCL Shielded B 2.33E+02 75 CON A30U 114/Z02 16 25 1 Z89E+02 eo SCL Unshkied B .

76 CON A31S 114=202 16:28 1 1.84E+02 so SCL Shielded 1.84E+02 77 CON A31U 11412002 16:29 1 ZU3E+02 eo SCL Unshkieded B .

- Soure Check 1/4/2002 17 27 1 1.70E+05 so SCL -B M/n/mum, 1.72E402 2.22E402 Maximurmz- 2.78E+02j 3M8E402 Ueen=-, 2.111E+02 3.06E402 S/ama - 2.69E+O1I 3.5E+01 A-i'nhc44tnT- X,-1

I ., , , ,,

oL7-1 concrete surface variability data Use OL1 SSGS Boiler Pad Concrete OW CW cpm cpm 368 266 444 289 335 289 338 293 331 265 374 295 TOTAL 2190 1697 MAX 444 295 MIN 331 265 MEDIAN 353.00 289.00 AVG 365.00 282.83 STD DEV 42.70 13.63 OW is the open window reading CW is the closed window reading All readings taken with Ludlum 2350 data logger and Ludlum 43-68 probe The 43-68 probe ia a 126 cm2 gas flow proportional detector A7ACsJ+MEHF 8F-2

0L7 asphalt (background)

Power Plant Road Survey Reading Number GRID cpm FSS-1541 N/A 81 98 59 TOTAL 238 MAX 98 MIN 59 MEDIAN 81.0000 AVG 79.3333 STD DEV 19.5533 All readings taken with Ludlum 2350 data logger and Ludlum 44-10 probe 44-10 probe contains a 2 inch long by 2 inch diameter Nal crystal Survey FSS-1541 was conducted 4/27/05 A-rrAcsi4M Eiv T- 8 -1

0L7-1 and 0L7-2 asphalt surface variability data V

0L7-1 paved 0L7-2 paved Survey Reading Survey Reading Number GRID cpm Number GRID cpm FSS-1476 AM136 121 FSS-1476 AD126 207 AM135 85 AC125 124 AM134 58 AC124 115 AM133 56 AC123 97 AM132 94 AC121 126 FSS-1477 AN136 144 AC117 155 AN135 73 AB119 140 AN134 53 FSS-1477 AL135 127 AN133 79 AK135 149 AN132 62 AJ134 122 A1133 145 AH132 167 AG132 171 AF131 153 AF130 166 TOTAL 825 TOTAL 2164 MAX 144 MAX 207 MIN 53 MIN 97 MEDIAN 76.0000 MEDIAN 145.0000 AVG 82.5000 AVG 144.2667 STD DEV 29.9972 STD DEV 27.3873 All readings taken with Ludlum 2350 data logger and Ludlum 44-10 probe The 44-10 probe contains a 2 inch long by 2 inch diameter Nal crystal Both surveys (FSS-1476 and FSS-1477) were conducted 4/14/05 A77ACW#A 'r 1-#

.. . .

I Exhibit Survey Unit Inspection Check Sheet nAIIIAL?

SECTION 1- SURVEY UNIT INSPECTION DESCRIPTION -

Survey Unit # 0L7 Survey Unit Location Stack Release Area (SSVW)

Date 4/13/05 Time l 1145 Inspection Team Members R. Shepherd, K Lane

- SECTION 2 - SURVEY UNIT INSPECTION SCOPE Inspection Requirements (Check the appropriate Yes/No answer.) Yes No NIA

1. Have sufficient surveys (I.e., post remedlation, characterization, etc.) been obtained for the survey unit? X

2. Do the surveys (from Question 1)demonstrate that the survey unit will most likely pass the FSW? X

3. Is the physical work (i.e., remediation &housekeeping) in or around the survey unit complete? X

4. Have all tools, non-permanent equipment, and material not needed to perform the FSS been removed? X

5. Are the survey surfaces relatively free of loose debris (i.e., dirt, concrete dust, metal filings. etc.)? X

6. Are the survey surfaces relatively free of liquids (i.e., water, moisture, oil, etc.)? X

7. Are the survey surfaces free of anlpaint, which has the potential to shield radiation? X

8. Have the Surface Measurement Test Areas (SMTA) been established? (Refer to Exhibit 2 for instructions.) X

9. Have the Surface Measurement Test Areas (SMTA) data been collected? (Refer to Exhibit 2 for Instructions.) X

10. Are the survey surfaces easily accessible? (No scaffolding, high reach, etc. is needed to perform the FSS) X

11. Is lighting adequate to perform the FSS? X

12. Is the area industrially safe to perform the FSS? (Evaluate potential fall 8 trip hazards, confined spaces, etc.) X

13. Have photographs been taken showing the overall condition of the area? X

14. Have all unsatisfactory conditions been resolved? X NOTE: If a No answer is obtained above, the Inspector should Immediately correct the problem or Initiate corrective actions through the responsible site department, as applicable. Document actions taken andlorJustifications in the 'Comments section below. Attach additional sheets as necessary.

Comments:

Response to Question 3:

Intermodal shipping container is located within survey unit. Notified L. Shamenek.

Response to Question 4:

Miscellaneous building materials are stored thorough the survey unit. Notified L Shamenek.

Response to Question 5:

Roadway/concrete surfaces need to be cleaned off prior to FSS (as deemed by survey designer). Notified L. Shamenek.

Response to Question 10/11:

A manhole located in grid AG-131 and storm drains in grids AN-134 and AO-131 may require access for FSS. Notified L. Shamenek SurveyUnitlnspector(print/sign) RayShepherd! A --

e--' KevinLane//2LW~I Date l 4/13105 Survey Designer (print/sign) ITr- s+in 14 .MT AcAa /kL, (Th) 42. IDate I 44S

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T" Exhibit i Survey UAt Inspection Check Sheet 0C  ! AL SECTION 1- SURVEY UNIT INSPECTION DESCRIPTION Survey Unit # OL7 V Survey Unit LocationI STACK RELEASE AREA (SSW)

Date l 4127105 l Time 1300 l Inspection Team Members I R. Shepherd SECTION 2 - SURVEY UNIT INSPECTION SCOPE Inspection Requirements (Check the appropnate Yes/No answer.) Yes No NIA

1. Have sufficient surveys (i.e.. Pos.remodiation, cha acarizatlon. etc.) bean obtained for the survey unit? X

2. Do Ihe surveys (from Question 1)cemcnstrate that tme survey unit Wilt most likely pass the FSS7 x

3. Is the physical work (i.e.. rernedirtion & housekeeping) inor around the survey unit complete7 x41 4 Have all tools, non-permanent equipment. and material not need" to prfeorm thr FSS been remove_?

5 Are the survey surfaces relatively free of loose debris (i.e., din, concrete dust, metal filings. eic )7 X 6 Are the survey surfaces relatively free of liquids (te.. water. moisture oi, etc)* . Xl

7. Are the survey surfaces free of all paint. wthch has the potential to shield radietion7 X

8. Have the Surfaca Measurement Test Areas (SMVTA) been estac!inhed7 (Refer to Exhibit 2 for instcrusons.) I TX -

9 Have the Surface Measurement Test Areat (SMTA) data been colftacsdI (Refer to Exhibit 2 for instruchons) l X 10 Are the survey surfaces easily accessible? (No scaffolding, high reach. etc. is needed to perform the FSS) !X l 11 Is lighting adequate to perform the FSS? X

2. is the area industrially safe to perform the FSSO (Evaluate potential fal & trip hazards, conmfnod spaces. etc) x

13. HMve photographs been tWken showing the overall condition of the area? X

14. Have atl unsatisfactory conditions beon resolved? X NOTE: If. a No answer it obtafnd above, the inspector should Immedeatnly correct the prmblem or initiate corrctive actions through the responsible site department as elcnabie. Document actlons taken andlor justifications in the Comments section below. Attach additional steets as necessary.

Cormrments' Response to Questions 4 and 5 D&D to clean surfaces and remove remaining material and equipment before placing unit in PRI status.

Lou Shamenek notified.

Survey Unit In5pector (printnsign) R. Shepherd I Survey Designer (print/sign) 1-.;

I- - I A-1y"14&a '? SO 39'Vd Nmava oas/6IEIE9,0 gilio 6S:01 SGOOZ/60/so

Number Saxton Nuclear Expetimenlal Corporation

- SAXTON NUCLEAR Facility Policy and Procedure Manual E900-IMP-4520.06 Title Survey Unit Inspection in Support of FSS Design EXHIBIT 3

{ Revision No.

O Surface Measurement Test Area (SMTA) Data Sheet

.ru - . .  : . - ,. _X I ';";H;- ^ - .  :.SECTIONI-DESCRIPTION' I. - .

SMTA Number SMTA- SSS-I- 3 SurveyUnilNumber I OL-SMTA Location So gVIC- P w."'e SurveyUnitInspector l 5ePIetel Date l -vi-Of Tme llt v58 o

'SgCTION 2 -.CALIPER INFORMATION & PERSONN4EL INVOLVED -

Caliper Manufacturer MI fD . Caliper Model Number CC' - 4 CS Caliper Serial Number 7 L3 S s 3 Calibration Due Date (as applicable)  ! /-

Rad Con Technician l Wj -Ci Date I Lq-7-7-o.s- Time l11ou Survey Unit Inspector Approval l Date l-27-oS

,-..- SECTION 3- MEASUR MENTRESULTS  : . -'.

SMTA Grid Map & Measurement Results in Units otmm Comments (Insert Results in White Blocks Below) _ _ ___ ____

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. .13 . 9 25 31

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r 22 28 34 V,- -

1 '23 29 35' IS- -- 2-3 v3'3. . ..... ~ _ I 24 30 30

.......

Average Measurement o' mm

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Additional Measuremenis Required 9 Airr9AcENhJr7- *-.

EO 39vd N03C[NdA.1113-! 69:01 901aZ/60/90 SNS 2/TE9E/S2

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Numaev Saxion Nuclear Experimental Corporation SAXTON NUCLEAR Facility Policy and Procedure Manual E900-IMP-4520.06 Titte Revisbon No.

Survoy Unit Inspection in Support of FSS Design No.

EXHIBIT 3 Surface Moasurement Tost Area (SMTA) Data Sheet

.  ;... SECTION 1 -DESCRIPTION- .

SMTA Number SMTA - 5.5 I-l Survey Unit Number I = 7 SMTA Location aA Ge't' A S sT of<RC F Op AF 7LIt Survey Unit Inspector 5hl Date q-7 l Time /030 a,.^,>9 . SECTION

UiW .. 2 - CALIPER INFORMIATION & PERSONNEL INVOLVED  ; .j.

Caliper Manufacturer l t , Caliper Mcdel Number C Ž - L" C S Caliper Serial Number o -7 (. 3 'iS 3 j Calibration Due Date (as applicable) i ,

Rad Con Technician I y _ I Date yq-Z7-, 5 -l Time l Survey Unit Inspector Approval lr: Date l z-?-O rr. ... SECTION 3 - MEASUREMENT RESULTS 7...

SMTA Grid Map a Measurement Results in Units of mm Comments (insert Results in White Btocks Below) __ _ _ _ _ _ _

7*15 19 325 .r 31 s - 55 ; ./~ .26

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14, 20 5 .z 26 32

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22: ' 250 2.34

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'3-5 . SO 1.) 1- *-

. 12; =' - 24 30 35 Average Measurement 3) mm Additional Measurements Requirea 9

A 1 Tk*4 Ffl - 4?- 4 Z0 39,Vd N03a'V8 A1I-1I3Vd 034S ~2 NOU~A+/-II3~d 3NSdIEZ9E9t't8

't:ol sGOO/60/so

Numoet Saxton Nuclear Experimenlal Corporation SAXTON NUCLEAR I Facility Policy and Procedure Manual I E900-IMP-4520.06 Tidle Revison No.

Survey Unit Inspection in Support of FSS Design _ 0 EXHIBIT 3 Surface Measurement Test Area (SMTA) Data Sheet

',dI*Qf ;.ii;. .SECTIONA -.DESCRIPTION *.

SMTA Number I SMTA- SS l-Z l Survey Unit Number l 3 L- 7 SMTALocation l ourj 6 64 G ('A-)

p-- 5 o. frmrT TtzLe Survey Unit Inspector

• 4,e A, A e T Date l f o J- Time ios t *. SECTION 2 - CALIPER INFORMATION & PERSONNEL INVOLVED .,:-'-,.,

Caliper Manufacturer l Caliper Model Number C , - C," C .5 Caliper Serial Number l ) L 3 5 J Calibration Due Date (as applicable) ,v /4 Rad Con Technician l A Irve Date I y-27-05 Time 103.5 Survey Unit Inspector Approval rb.ie s ,/e- Date 4-27 a

. .. *:'; --  ;. ;'SECTION 3 - MEASUREMENT RESULTS ..

SMTA Grid Map & Measurement Results in Units of mm Comments (Insert Results in White Blocks Below)

13 i.3 25 31_

O

-2 ,( c of -C -A' I -Cs 50-.-f i2 *.~s O714. 20 55t 32

.t2afl lwi ..... , . C73 ...... ^-,;2

.37

-8 8 37 1.5 2, 2 34

.17 '23 29 36,

-- . t12' 18 ~'24 30 3z 2.7 2. I,8 ,I q; Average Measurement 3./Y? mm Additional Measuremenis Required 9 AFTAM :*EJMT7 q-To 39v<d I'Mard AI5IIIV. 3 3N5 0 1EZGE319718 5G:1 S00z/60/gs

APPENDIX B Calculation to Convert Na! cpm Values into dpm/l 00cm2

Calculation to Convert Nal cpm Values into dpm/1 00 cm2 Attachments 4-2 and 4-3 of Appendix A document Nal Scan MDCs used during the implementation of this final status survey (FSS). Two of the factors used in that calculation are needed to derive a conversion from cpm to dpm/100 cm2 so that Nal static values obtained during the FSS can be compared to the Administrative 2

Limit of 19,834 dpm/100 cm2 and the DCGL of 26,445 dpm/100 cm .

The two values needed are:

1. 205.6 cpm per uR/hr - the Nal calibrated response to Cs-1 37 and

2. 1.794E-5 mR/hr per pCi/cm2 - the MicroShield-derived exposure rate from 1 pCi/cm2 of Cs-137 205.6 cpm per uR/hr is equivalent to 205,600 cpm per mR/hr 1.794E-5 mR/hr per pCVcm2 is equivalent to 8.081 E-8 mR/hr per dpm/1 00 cm2 Multiplying the two yieldsl.661 E-2 cpm per dpm/1 00 cm2 Taking the inverse of the above yields 60.188 dpm/100 cm2 per cpm As an example, if a gross count rate is 400 cpm and the background count rate is 300 cpm, then the net activity is 6,019 dpm/100 cm2 (i.e., [400 cpm - 300 cpm] x 60 dpm/100 cm2 per cpm).

Normally, one would subtract background similar to the example above. Inthis case, the LTP requires use of the sign test which demands use of gross rneasurements only. Inthis FSS Report, the gross count per minute values are multiplied by the conversion and then compared to both the Administrative Limit and the DCGL. For example, a gross measurement of 121 cpm converts directly h17,280 dpm/100 cm2 (i.e., 121 x 60.19 dpm/100 cm2 per cpm).