ML25288A023
| ML25288A023 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 10/15/2025 |
| From: | Wiblin C ADP CR3 |
| To: | Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML25288A001 | List:
|
| References | |
| 3F1025-01 | |
| Download: ML25288A023 (1) | |
Text
ENCLOSURE 16 Crystal River Unit 3 Nuclear Generating Plant Docket Nos. 50-302 / 72-1035 Operating License DPR-72 North Star, 2025. Technical Support Document, Application of NaI Detector for Scans and Statics at CR3 Begins On Next Page 3F1025-01 / Enclosure 16 lef
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 Crystal River 3 Nuclear Power Plant - Technical Basis Document Application of NaI Detector for Scans and Statics at ADP CR3 Revision 0 September 2025 Prepared by: Claude Wiblin, CHP, Chesapeake Nuclear Services, Inc.
Reviewed by: Duane DeMore, CHP, Chesapeake Nuclear Services, Inc.
Reviewed by: Marshall H Blake, FSS Engineering Supervisor Approved by: Leon Bryant Akins Jr., RPM, ADP CR3 Decommissioning C iA,uk 7J.J,t;.,._
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3F1025-01 / Enclosure 16 / Page 1 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 i
Table of Contents List of Tables............................................................................................................................. i Executive Summary.................................................................................................................. 3 1.0 Introduction...................................................................................................................... 5 2.0 Background...................................................................................................................... 5 3.0 Limitations........................................................................................................................ 6 4.0 Method for Determination of NaI Detector MDC for Soil................................................ 7 5.0 Radionuclide Distribution and ALARA DCGLs.............................................................. 7 6.0 MicroShield Modeling and Results................................................................................. 9 6.1 Surface Soil.............................................................................................................10 6.2 Concrete Surface Disk.............................................................................................10 6.3 Underwater MARSSIM Sediment Cylinder...............................................................10 7.0 Evaluation of Detector Background Rates................................................................... 11 8.0 Scan Minimum Detectable Concentrations for Various Materials.............................. 11 9.0 Static Minimum Detectable Concentrations for Various Materials............................. 15 10.0 References...................................................................................................................... 16 List of Tables Table 1 - Classic Scan MDCs (pCi/g)...................................................................................... 3 Table 2 - Static MDCs (pCi/g).................................................................................................. 4 Table 3 - Normalized Fractional Abundances for Gamma Emitters..................................... 8 Table 4 - MicroShield Concentration Input per ROC............................................................. 8 Table 5 - ALARA DCGLs.......................................................................................................... 9 Table 6 - Development of DCGLGA.......................................................................................... 9 Table 7 - Ludlum 44-10-5 Underwater Reference Area Statistics........................................11 Table 8 - Detector Background Levels..................................................................................11 Table 9 - Selected Detector Heights for Scan and Static Measurements............................12 Table 10 - Summary of Area Efficiency Factors....................................................................14 Table 11 - Scan MDC (pCi/g)...................................................................................................14 Table 12 - Static MDCs (pCi/g)...............................................................................................15 3F1025-01 / Enclosure 16 / Page 2 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 ii List of Attachments - MicroShield Reports...................................................................................17 - MARSAME CPMR, ERC, and Efficiency Calculations................................30 3F1025-01 / Enclosure 16 / Page 3 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 3 Executive Summary To support the Accelerated Decommissioning Partners Crystal River Unit 3 (ADP CR3)
License Termination Plan, a recent technique developed by NUREG-1507 for the use of NaI detectors for scanning and static measurements was applied using site-specific information where possible. This Technical Basis Document (TBD) evaluates the sensitivity of the Ludlum Model 44-10 and 44-10-5 2.0-inch by 2.0-inch or equivalent Nal detectors when used to scan open land, concrete areas, or underwater sediment as a function of background, scan speed, and radionuclide mixture and to perform static measurements of soil and concrete. The Model 44-10-5 is waterproof.
The scan and static minimum detectable concentrations (MDCs) were developed for four material areas at the site, with different relative abundances of radionuclides in each. This TBD provides the basis for using a Ludlum lead shield to provide even more options. As a tool for evaluating which option will achieve the desired compliance and the Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) recommendation that MDCs should be less than 50% of the Derived Concentration Guideline Level (DCGL), the gross activity DCGLw was developed for each of the four principal areas: Soil-Open land, Reactor concrete or steel substructure, Balance of Plant (BOP) concrete substructures, and the Discharge Canal sediment. The Gross Activity DCGL values are 11 picocuries per gram (pCi/g), 9.71 pCi/g, 9.6 pCi/g, and 3.4 pCi/g, respectively.
This TBD illustrates the classic technique for determining Scan MDC, as shown in Executive Summary Table 1. Static MDCs are shown in Executive Summary Table 2. All of the presented values are less than the respective Gross Activity DCGL; however, the highlighted table values are acceptable for use as they are less than 50% of the respective DCGL.
Table 1 - Classic Scan MDCs (pCi/g)
Area Detector Height (cm)
MDCR (cpm)
MDCR with Shield (cpm)
Efficiency (cpm/pCi/g)
Scan MDC (pCi/g)
Scan MDC with Shield (pCi/g)
Surface Soil -
Open Land 1
956 617 414 2.3 1.5 10 956 617 119 8.1 5.2 Reactor Building15 cm thick Concrete 1
676 437 517 1.3 0.8 6
676 437 144 4.7 3.0 BOP Building 15 cm thick Concrete 1
676 437 478 1.4 0.9 6
676 437 255 2.6 1.7 Discharge Canal 0-15 cm thick Sediment 1
427 860 0.5 cm = centimeters cpm = counts per minute cpm/pCi/g = counts per minute per picocuries per square centimeter per gram 3F1025-01 / Enclosure 16 / Page 4 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 4 Table 2 - Static MDCs (pCi/g)
Area Detector Height (cm)
MDCR (cpm)
MDCR with Shield (cpm)
Efficiency (cpm/pCi)
Static MDCs (pCi/g)
No Shield With Shield Surface Soil -
Open Land 1
956 617 414 0.24 0.15 Reactor Building 0.1 cm thick concrete 1
676 437 16.2 6
4.0 Reactor Building 0-15 cm thick concrete 1
676 437 517 0.2 0.1 BOP Building 0.1 cm thick concrete 1
676 437 15.0 7
4.3 BOP Building 0-15 cm thick concrete 1
676 437 478 0.2 0.1 Discharge Canal Sediment 0-15 cm 1
427 860 0.2 3F1025-01 / Enclosure 16 / Page 5 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 5 1.0 Introduction United States Nuclear Regulatory Commission (NRC) guidance addressing the fundamental concepts for both static and scan surveys is described in NUREG-1505 (NRC, 1998) [2] and NUREG-1507 (NRC, 2020) [6]. As described, the minimum detectable concentration (MDC) corresponds to the smallest activity concentration measurement that is practically achievable with a given instrument and type of measurement procedure. The MDC depends not only on the instrument characteristics (instrument efficiency, background, integration time, etc.), but also on the factors involved in the survey measurement process, which include surface type, source-to-detector geometry, and source efficiency (backscatter and self-absorption).
In addition to the Minimum Detectable Count Rate (MDCR) and detector characteristics, the scan MDC (in picocuries per gram [pCi/g]) is based on the area of elevated activity, depth of contamination, and the radionuclide (i.e., energy and yield of gamma emissions).
If one assumes constant parameters for each of the above variables, the scan MDC may be reduced to a function of the radionuclide alone. NaI scintillation detectors are generally used for scanning land areas.
It is emphasized that while a single scan MDC value can be calculated for a given radionuclide, other scan MDC values may be equally justifiable depending on the values chosen for the various factors, including the MDCR (background level, acceptable performance criteria, observation interval), surveyor efficiency, detector parameters, and the modeling conditions of the contamination.
This TBD has three goals, which are to describe an alternative application of the 2-inch by 2-inch sodium iodide (NaI) detector for:
- 1) Scanning soil and concrete cracks/wall joints, and very rough concrete surfaces;
- 2) Direct static measurements for concrete; and
- 3) Underwater scanning of sediment.
This TBD identifies detectable residual concentrations for Co-60 and Cs-137 at the Crystal River Unit 3 (ADP CR3) site locations.
2.0
Background
NaI detectors are typically used for scanning areas for residual gamma-emitting radioactivity because they are very sensitive to gamma radiation, easily portable, and relatively inexpensive. The detector is held close to the ground surface and moved in a serpentine (i.e., snake-like, S shaped) pattern while walking at a speed that allows the investigator to detect the desired investigation level.
A scan rate of approximately 0.5 meters per second (m/s) is typically used for distributed gamma-emitting contaminants in soil; however, this rate is adjusted depending on the expected detector response and the desired investigation level, and with a height of approximately 6 centimeters (cm) or 2.5 inches [3]. (MARSSIM pg. 6-14).
A different height of 10 cm is applied in modeling per MARSSIM section 6.7.2.1 (pg. 6-44), which implies that scanning may be performed at specific distances for actual use and modeling. At ADP CR3 for the Final Status Survey (FSS), the adopted 3F1025-01 / Enclosure 16 / Page 6 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 6 standard scanning heights are for soil at 10 cm, concrete at 6 cm, and underwater sediment at 1 cm.
All static measurements are performed at a height of 1 cm from the material surface; these distances are reflected in Table 9, below.
Published sensitivity for the Ludlum 44-10 detector is listed by Ludlum, the manufacturer, as 900 counts per minute per micro-roentgen per hour (cpm/µR/hr) for Cs-137 [11]. Ludlum also provides a typical background rate of 9,750 cpm in a 10 R/hr field. Table 6-8 of NUREG-1507 lists the Co-60 and Cs-137 sensitivity for a 5.08-cm by 5.08-cm (2-inch by 2-inch) Nal detector as 429 and 900 cpm/µR/hr, respectively. The scan MDCs for soil are listed as 4.1 pCi/g and 8.0 pCi/g, Co-60 and Cs-137, respectively, using a 9,750 cpm background level. The NUREG does not describe data for concrete surfaces or underwater measurements.
Ludlum provides a listing for 4-efficiencies: I-125 as 4%, Co-57 as 20%, Cs-137 as 9%, and Co-60 as 15%. The varying fractional abundances across the site require an extensive evaluation of the detector efficiency per type of material being evaluated
[11].
3.0 Limitations The information provided in this TBD is limited to 2-inch by 2-inch NaI detectors. The use of a Ludlum 44-10 NaI detector is presented as an option for ADP CR3 personnel for scan and static measurements. This TBD emphasizes all gamma emitters while recognizing the varying activity abundances in the Reactor Building and the BOP substructures, the open land soil (not under buildings), and the underwater sediment of the Discharge Canal. ADP CR3 also has options of performing scans and static measurements with the Ludlum 44-10 both with and without a lead shield enclosing the detector housing (the collimator base was not used). This shield has a wall thickness of 0.23 inches. These options are evaluated and presented. Figure 1 provides a photo of the lead detector housing.
The methods developed herein remain applicable with changes to various parameters.
This remodeling may include changes, such as detector heights, observation interval time, scan speeds, and field background rates. When changed, the values and results will be summarized in each survey unit affected.
3F1025-01 / Enclosure 16 / Page 7 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 7 Figure 1 - Ludlum Lead Shield for NaI Detector 4.0 Method for Determination of NaI Detector MDC for Soil The MARSSIM-suggested scan speed of 0.5 m/s is used with the elevated (soil) area of interest being 0.25 square meters (m2). In a scanning survey, the field survey meter is operated while moving the detector over an area to search for a change in readings. Since the meter's audible signal responds faster than the meter display, listening to the built-in speaker or using headphones allows the user to more quickly discern changes in radiation level. When a scanning survey detects a change, the meter can be held in place for a more accurate static measurement [3] (MARSSIM page H-4).
MicroShield [8] was used to model a small area of elevated soil concentration to determine the net exposure rate produced by a radionuclide concentration at a distance 10 cm above the source. This position was selected because it relates to the average height of the NaI(Tl) scintillation detector above the ground during soil scanning. The factors considered in the modeling include:
Radionuclide of interest (considering all gamma emitters for decay chains);
Expected concentration of the radionuclide of interest; Areal dimensions of the area of elevated activity; Depth of the area of elevated activity; Location of dose point (NaI[Tl] scintillation detector height above the surface);
and Density of soil.
5.0 Radionuclide Distribution and As Low As Reasonably Achievable (ALARA) DCGLs The following table provides the normalized fractional abundances derived from LTP Chapter 6, Tables 6-3 through 6-6. As explained in License Termination Plan (LTP)
Chapter 2, the distributions for the Balance of Plant (BOP) and soils are the same, as 3F1025-01 / Enclosure 16 / Page 8 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 8 there were too many small results for soil samples to show an adequate analysis. There is a noticeable departure in the sediment of the Discharge Canal, as Co-60 is the dominant radionuclide versus Cs-137 for the others.
Although the europium isotopes are insignificant contributors to dose, they are included because the NaI detector does not discern between them. The normalized fractional abundances are derived by normalizing the relative fractional abundances for all gamma-emitters in the LTP. For a 1 pCi/g input into MicroShield, these fractions represent their respective part of the total 1 pCi/g.
Table 3 - Normalized Fractional Abundances for Gamma Emitters ROC Normalized Fractional Abundances (fi)
Reactor BOP Soils Discharge Canal Co-60 4.4E-02 1.56E-03 1.56E-03 8.27E-01 Cs-137 9.56E-01 9.93E-01 9.93E-01 1.58E-01 Eu-152 0.00E+00 5.85E-03 5.85E-03 0.00E+00 Eu-154 0.00E+00 0.00E+00 0.00E+00 1.41E-02 Sums 1.00E+00 1.00E+00 1.00E+00 1.00E+00 Table 4 presents the required concentration input in units of microcuries per cubic centimeter (Ci/cm3) for MicroShield. The densities of the source material are also provided, with their references appearing later in the document. The inputs are simply calculated as the fractional abundances multiplied by the material density and a unit conversion factor of 1 Ci per 1E+06 pCi.
Table 4 - MicroShield Concentration Input per ROC ROC MicroShield Input (Ci/cm3)
Reactor BOP Soils Discharge Canal Co-60 1.13E-07 3.63E-09 2.33E-09 1.41E-06 Cs-137 2.15E-06 2.31E-06 1.49E-06 2.69E-07 Eu-152 3.93E-08 1.36E-08 8.77E-09 0.00E+00 Eu-154 3.17E-08 0.00E+00 0.00E+00 2.39E-08 Density (g/cm3) 2.33 2.33 1.5 1.7 g/cm3 = grams per cubic centimeter Table 5 provides the ALARA DCGLs selected that are the lower of the U.S. Environmental Protection Agency (EPA) Industrial Soil Trigger Levels and the calculated site-specific values. These are derived for the surface soil and the less likely but plausible (LLBP) scenarios. LLBP scenarios include the Reactor Building substructure, the BOP substructures, and the Discharge Canal. ALARA DCGLW is only applied to surface soils (0-15 cm) while the LLBP scenarios require application of the ALARA DCGLV for subsurface soils (0-1 m).
3F1025-01 / Enclosure 16 / Page 9 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 9 Table 5 - ALARA DCGLs ROC ALARA DCGLs ALARA DCGLW 0-15 cm depth (pCi/g)
ALARA DCGLW 0-1 m depth (pCi/g)
Co-60 4.1 3.4 Cs-137 11 9.6 Eu-152 7
7 Eu-154 8
7.2 Following the formula of determining the DCGLGA as the reciprocal of the sum of the individual radionuclide fractions divided by their respective DCGLs, the DCGLGA for each of the principal areas is presented in Table 6.
Table 6 - Development of Gross Activity DCGLs ROC fi/DCGL Soils Reactor BOP Discharge Canal Co-60 3.80E-04 1.29E-02 4.59E-04 2.43E-01 Cs-137 9.03E-02 9.96E-02 1.03E-01 1.65E-02 Eu-152 8.36E-04 0.00E+00 8.36E-04 0.00E+00 Eu-154 0.00E+00 0.00E+00 0.00E+00 1.96E-03 Sum 0.09 0.11 0.10 0.26 DCGL (pCi/g) 10.9 8.9 9.5 3.8 6.0 MicroShield Modeling and Results Specific MicroShield code [8] evaluations (See Attachment 1) were conducted to determine the exposure rates for the combined nuclides. The calculations are based on dimensions, soil composition, and density for a 1.0 pCi/g concentration. These values are consistent with guidance provided in NUREG-1575 and 1757 Vol.2, R1.
The MicroShield code was used to determine the source efficiency, which is defined as the exposure-rate-to-concentration ratio (ERC) in units of R/h per pCi/g. It is the measured or estimated exposure rate at some distance from the defined source with a well-defined geometry (i.e., areal extent and depth). The MicroShield code requires that concentration be input in units of Ci per cm3; values are shown in Table 4.
Modeling analyses were conducted by selecting a radionuclide (or radioactive material decay series) and then varying the concentration of the contamination while holding the other factors constant. These factors include: the areal dimension of a cylindrical area of elevated activity is 0.25 m2 (radius of 28 cm); the depth of the area of elevated activity; the 3F1025-01 / Enclosure 16 / Page 10 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 10 dose point above the surface; and the density of source material, soil, concrete1, or sediment. The objective is to determine the radionuclide concentration that is correlated to the minimum detectable net exposure [3] (MARSSIM pg. 6-44).
6.1 Surface Soil The standard soil cylinder from MARSSIM is selected as the model for exposure evaluation. Factors are held constantthe areal dimension of a cylindrical area of elevated activity is 0.25 m2 (radius of 28 cm), the depth of the area of residual activity is 15 cm, the dose point is 10 cm above the surface, and the density of soil is a site-specific value of 1.5 g/cm3. Implementation for survey methods and guidance for open land soil surveying will be covered in the FSS survey plan.
6.2 Concrete Surface Disk The residual radioactivity on building surfaces (e.g., walls, floors, ceilings) is assumed to be surficial and nonvolumetric (e.g., 0.1 cm of penetration) [4]
(NUREG-1757 V2 Page H-3).
For the disk model selected to be similar in area to the standard MARSSIM soil model, but as a very thin disk, the area, volume, and mass are determined.
Area = r2 = 3.1416 x 282 cm2 = 2,463 cm2 Volume = Area x height = 2,463 cm2 x 0.1 cm = 246 cm3 Mass = Volume x = 246 cm3x 2.33 g/cm3 = 573 g A different view is that perhaps some concrete will have at depth contamination, and a 15 cm depth is then assumed (this should cover some cracks). The volume and mass of the thicker concrete are determined.
Volume = Area x height = 2,463 cm2 x 15 cm = 36,945 cm3 Mass = Volume x = 36,945 cm3x 2.33 g/cm3 = 86,000 g The dose point is 10 cm above the surface.
6.3 Underwater MARSSIM Sediment Cylinder The standard cylinder from MARSSIM is selected as the model for exposure evaluation. Factors are held constantthe areal dimension of a cylindrical area of elevated activity is 0.25 m2 (radius of 28 cm), the depth of the area of elevated activity is 15 cm, the dose point is 1 cm above the surface, and the density of sediment is 1.7 g/cm3 [12].
Mass = Volume x = 24,630 cm3x 1.7 g/cm3 = 41,871 g 1 The density of siliceous concrete has a range of 2.25 to 2.40 g/cm3 implying a median of 2.33 g/cm3 [7] (RHH, 1970 pg. 65).
3F1025-01 / Enclosure 16 / Page 11 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 11 7.0 Evaluation of Detector Background Rates Ludlum indicates a typical background for a Model 44-10 or Model 44-10-5 (waterproof) detector in a 10 R/h field as 9,750 cpm [11].
U.S. Army Corps of Engineers (USACE) published an underwater background statistical summary for a reference area as presented in Table 6 [10], above. The low cpm rates are attributable to the shielding provided by water; ADP CR3 Discharge Canal statistics are anticipated to be similar [10]. Results from this USACE report are summarized in Table 7 below.
Table 7 - Ludlum 44-10-5 Underwater Reference Area Statistics Statistic cpm Mean 2,383 Median 2,486 Standard Deviation 655 Minimum 521 Maximum 3,580 Count 102 The Oak Ridge Institute for Science and Education (ORISE) provided a surface scan range summary from 920 to 11,000 cpm in background areas [9]. Post remediation, the background rates will be reasonable for scan and static surveys, except perhaps near the Independent Spent Fuel Storage Installation (ISFSI), where additional directional detector shielding may be required. The BOP building Substructures are in the process of establishing the grid for FSS while the Reactor Building is being demolished. The 44-10 can be shielded, and field experience at ADP CR3 shows that if a shield is used, the cpm will drop from 5,100 cpm unshielded to 2,100 cpm shielded. For initial considerations, the background is considered as about 6,000 cpm without shielding and 2,500 cpm with shielding, and all assumed background rates are presented in Table 8. These are expected to change per actual field conditions, and the FSSRs will reflect field conditions.
Table 8 - Detector Background Levels Area No Shield (cpm)
With Shield (cpm)
Soil -Open Land 6000 2,500 Reactor 6000 2,500 BOP 6000 2,500 Canal Sediment 2400 8.0 Scan Minimum Detectable Concentrations for Various Materials Scanning is performed during radiological surveys in support of decommissioning to identify locations of elevated direct radiation that require further investigation.
NRC guidance addressing the fundamental concepts for both static and scan surveys is described in NUREG-1507 [6] (NRC, 2020).
An important parameter in determining MDCs is the background rate in cpm for the system deployed. The selected background cpm rates are listed in Table 8 with and without lead shielding.
3F1025-01 / Enclosure 16 / Page 12 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 12 The height above the surface is another parameter that is important for modeling, and the values selected for this TBD are provided in Table 9. Heights were selected to provide ADP CR3 with convenient heights for the best detectable cpm measurements.
Table 9 - Selected Detector Heights for Scan and Static Measurements Area Scan Height (cm)
Static Height (cm)
Soil -Open Land 10 1
Reactor 6
1 BOP 6
1 Canal Sediment 1
1 The MARSSIM classic scan strategy for determining the scan MDC is based on the premise that there are two stages of scanning. That is, surveyors do not make decisions on the basis of a single indication; rather, upon noting an increased number of counts, they pause briefly and then decide whether to move on or take further measurements.
Thus, scanning consists of two components: continuous monitoring and stationary sampling.
In the first component, characterized by continuous movement of the probe, the surveyor has only a brief look at potential sources, determined by the scan speed. The second component occurs only after a positive response was made at the first stage. This response is marked by the surveyor interrupting his scanning and holding the probe stationary for a period of time, while comparing the instrument output signal during that time to the background counting rate. This technique leads to an a priori scan MDC.
MARSSIM indicates that the detector is held close to the ground surface (approximately 6 cm or 2.5 inches) and moved in a serpentine (i.e., snake-like, S shaped) pattern while walking at a speed that allows the investigator to detect the desired investigation level.
A scan rate of approximately 0.5 m/s is typically used for distributed gamma emitting contaminants in soil; however, this rate must be adjusted depending on the expected detector response and the desired investigation level. Note this height is adjusted to the modeling desired.
The a priori scan MDC is determined by (1) estimating the net MDCR that a surveyor can distinguish from the background detector response, and (2) applying efficiency factors that relate to the surveyor, instrumentation, and source of radiation. Generically, these factors may be mathematically described as follows:
3F1025-01 / Enclosure 16 / Page 13 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 13 The expression for the ideal observers MDCR, in cpm, is written as the following:
= x x (60
)
Where:
MDCR = minimum detectable (net) count rate for the ideal observer in cpm d = the index of sensitivity bi = background counts in the observation interval i = observational interval (in seconds), based on the scan speed and areal extent of the contamination For the less-than-ideal (i.e., human) observer, the surveyor efficiency (p) is applied to the MDCR. To adjust to a surveyor specific MDCR (MDCRsurveyor) the counting rate is divided by the square root of the surveyor efficiency. NUREG-1507 permits the value of p to be 0.75 for experienced surveyors.
And the classic Scan MDC is rewritten as:
=
x x (60
)
x (. ) x (. )
where efficiencies (Effs.) are used to convert MDCR in cpm to a quantity that is directly comparable to a cleanup goal (e.g., disintegrations per minute per 100 square centimeters
[dpm/100 cm2] for surfaces or pCi/g for soil).
Working from the Classic MDC equation, including the d as 1.38 and surveyor efficiency as 0.75, MDCRsurveyor results for the parameters listed follow:
For soil measurements with a 2-second observation interval:
Soil MDCR =
1.38 0.75 x 6,000 2/60 x (60/2) = 676 cpm without shielding.
Soil MDCR =
1.38 0.75 x 2,500 2/60 x (60/2) = 437 cpm with shielding.
For concrete measurements with a 2-sec observation interval:
Concrete MDCR =
1.38 0.75 x 6,000 2/60 x (60/2) = 676 cpm without shielding.
Concrete MDCR =
1.38 0.75 x 2,500 2/60 x (60/2) = 437 cpm with shielding.
For sediment measurements, with a 2-sec observation interval:
Sediment MDCR =
1.38 0.75 x 2,400 2/60 x (60 /2) = 427 cpm without shielding.
3F1025-01 / Enclosure 16 / Page 14 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 14 The data in Attachment-1 presents the MicroShield determined exposure rate results for various mixtures of gamma emitters. Following the NUREG-1507 terminology, where:
CPMR = count-rate-to-exposure rate ratio ERC = exposure-rate-to-concentration ratio As shown in Table 10, these were calculated using the information in the Multi-Agency Radiation Survey and Assessment of Materials and Equipment (MARSAME) [5]. Calculation Tables are presented in Attachment 2.
Table 10 - Summary of Area Efficiency Factors Area Detector Height (cm)
CPMR (cpm/R/h)
ERC (R/h per pCi/g)
Efficiency (cpm/pCi/g)
Soil -Open Land 1
998 0.415 414 10 534 0.222 119 Reactor Thin Disk 1
942 0.017 16.2 6
453 0.008 3.70 Reactor Thick Disk 1
890 0.581 517 6
649 0.222 144 BOP Thin Disk 1
1035 0.015 15.01 6
498 0.007 3.43 BOP Thick Disk 1
995 0.480 478 6
727 0.351 255 Discharge Canal Sediment 1
500 1.720 860 Inserting the above values into the scan MDC equation yields Table 11 - Scan MDC (pCi/g)
Area Detector Height (cm)
MDCR w/o Shield (cpm)
MDCR w Shield (cpm)
Efficiency (cpm/pCi/g)
Scan MDC w/o Shielding (pCi/g)
Scan MDC w/ Shielding (pCi/g)
Soil -Open Land 1
676 437 414 1.6 1.1 10 676 437 119 5.7 3.8 Reactor Thin Disk 1
676 437 16.2 42 27.0 6
676 437 3.70 183 118.1 Reactor Thick Disk 1
676 437 517 1.3 0.8 6
676 437 144 4.7 3.0 BOP Thin Disk 1
676 437 15.01 45 29.1 6
676 437 3.43 197 127.4 BOP Thick Disk 1
676 437 478 1.4 0.9 6
676 437 255 2.6 1.7 Discharge Canal Sediment 1
427 860 0.5 3F1025-01 / Enclosure 16 / Page 15 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 15 9.0 Static Minimum Detectable Concentrations for Various Materials For assessing MDC for surface activity measurements, the MDC is given in units of cpm/(pCi/g). To improve statistics, a 10-minute measurement time is specified; a background count time of 20 minutes is assigned, consistent with the field measurements:
=
3 + 3.29 x +x 1 + +
x x +
Source: Modified NUREG-1507, Equation 3.11 [6].
Where RB is the count rate corresponding to the detector and area for the unshielded or shielded configuration from Table 11. The MDC for surface contamination is calculated for a 10-minute sample count with a 20-minute reference background count time and shown in Table 11. Static MDCs were not determined for the Discharge Canal Sediment, as the instability of the boat might mean the measurement location could be compromised.
Table 12 - Static MDCs (pCi/g)
Area Detector Height (cm)
Efficiency (cpm/pCi/g)
Static MDCs (pCi/g)
No Shield With Shield Soil -Open Land 1
414 0.24 0.15 Reactor 0.1 cm thick concrete 1
16.2 6
4.0 Reactor 15 cm thick concrete 1
517 0.2 0.1 BOP 0.1 cm thick concrete 1
15.0 7
4.3 BOP 15 cm thick concrete 1
478 0.2 0.1 Discharge Canal Sediment 1
860 0.2 Sample time is reduced to 1 minute for Discharge Canal Sediment.
3F1025-01 / Enclosure 16 / Page 16 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 16 10.0 References
- 1. Crystal River 3 License Termination Plan, Revision 3, October 2025.
- 2. NUREG-1505 Rev 1, "A Nonparametric Statistical Methodology for the Design and Analysis of Final Status Decommissioning Surveys" June 1998.
- 3. NUREG-1575, Rev. 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM), EPA 402-R-97-016, Rev. 1, DOE/EH-0624, Rev. 1. NRC:
Washington, DC, U.S. Department of Defense, U.S. Department of Energy, U.S.
Environmental Protection Agency. 2000.
- 4. NUREG-1757 V2 Rev 1.0 "Consolidated Decommissioning Guidance:
Characterization, Surveys and Determination of Radiological Criteria" September 2006.
- 5. NUREG-1575, Supp. 1, Multi-Agency Radiation Survey and Assessment of Materials and Equipment Manual (MARSAME) January 2009.
- 6. NUREG-1507, Revision 1, Minimum Detectable Concentrations with Typical Radiation Survey for Instruments for Various Contaminants and Field Conditions.
August 2020.
- 7. Radiological Health Handbook, US Department of Health, Education and Welfare, January 1970. Pg. 65.
- 8. Groves, 2009. MicroShield Version 8.02. Groves Software, Inc. 2009.
- 9. ORISE. Independent Confirmatory Survey Summary and Results for the 3,854 -Acre Partial Site Release at the Crystal River Energy Complex, Crystal River, Florida.
December 6, 2019.
- 10. USACE Technical Memorandum Underwater Gamma Scanning Survey -Great Kills Park Harbor Phase 1 Remedial Investigation for Operable Unit 2 for Great Kills Park site, Gateway National Recreation Area, Staten Island, New York. February 22, 2019.
ADAMS Accession number ML19205A161. (This reference is attached to primary, please scroll towards the end of document.)
- 11. Ludlum 2023, Ludlum Model 44-10 Gamma Scintillator, May 2023.
- 12. Gladkikh, V., Assessment of Density Variations of Marine Sediments with Ocean and Sediment Depths, Scientific World Journal, March 6, 2014.
https://doi.org/10.1155/2014/823296 3F1025-01 / Enclosure 16 / Page 17 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 17 ATTACHMENT 1 - MicroShield Reports Table of Contents Area Material Depth (cm)
Measurement Heights (cm)
Page Land Soil 15 1 and 10 19 Reactor Substructure Concrete 0.1 1 and 6 21 Reactor Substructure Concrete 15 1 and 6 23 BOP Substructure Concrete 0.1 1 and 6 25 BOP Substructure Concrete 15 1 and 6 27 Discharge Canal Sediment 15 1
29 3F1025-01 / Enclosure 16 / Page 18 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 18 Date By l\\UrroSbield 8 JJ2
'\\I\\ iblin (8.02-0000)
Chedred Filename Run Date September 6.025 Ril!ln Time 5:5 :17 AM CR3 Soils 1 and 10 cm_msd Ca e Title Description Geome f
He(ght Radius A
X 1
o_o cm (0 in)
,,.2 o_o cm (0 in I
S-o,11mi:e Dimensions Prnj,ert Info CR3 Soil
- td Cyl 1 S cm depth at 1 and 10 cm 8 - Cylmder, olume - End
- hields 15.0 cm (S.9 m
~8_0 cm (11.0 in)
Dos*e Points
\\
16_0 cm (63 in) 25_0 cm (9.8 in) z 0.0 cm (0 m) 0.0 Cllli (0 in)
Shield l Source Air Gap
\\\\ all Clad
- hi.elcls Dimerui.ou Matierial Densirty nrlide Ba-137m Co-'60 Csrl37 Eu-152 3.69e+04 c1n3 FGR-12 Soil LS Arr 0_001 2 SO_Ocm FGR-1
- Soil LS Som*c,e Iuput: Groupirng M,ethod - Stand.ard Indices
_ nmber of Grnups: 25, L ower Energy Cutoff: 0... 015 Photons< 0... 015: Ind ucled Library: Gn1n-,e Ci.
Bq JtC" rm:i, 5,_2076e-008 L9: 68e+003 !
- 1. 409 5e-006 8.6082e-Ol 1 3_1850e+OOO
_3300e-009 S.S048e-008
_0368e+003 l _ 4900e-006 3.2401e-010 Ll 988e+001 8-7700e-009 Bnirldnp: The mafc,e1i al r,eferenre i'>,, aiH Clad lnfueGratiou Par.a meters Radial Circumferential Y Direction (axia )
Resnltc,; - Dose Point# l -, 0,1&,_()),rm Duration 00:00:00 Bq/rm],
S-2153e-OO 8_6210e-005 S -513 Oe-002.
3-2449e-004 30 20 0
Flu!enre Raie Flueure Rate Exposure Rate Expo,sure Rate Euei*g:J (l\\:IeV) Artid ty (Pbotmts/sec) MeV/,rm2/:<.er l\\[e\\ *lcm:t-Js,er mR!h:r mR/hr l o Buildup,1\\ ifu BnHdup No Buildup With Buildup
[
o_ots
..l.._
2.I82e+Ol 3_8,79e-07 4.052ie-07 3.3 '7e-08 3.475e-08 3F1025-01 / Enclosure 16 / Page 19 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 19 0.03 1.B5e+02 2.702e-05 3.570e-05 2.678e-07 3.5,38e--07 0.0 3.388e+Ol 2.lOOe-05 3.52.0e-05 9.286e-08, 1.557e--07 0.05 1.774e+OO
- .097e-06 4.708e-06 5.586e-09 1.254e--08 0.1 3.409e+OO 1.370e-05 4.960e-05 2.096e-08, 7.588e--08 0.2 8.983e-01 1.Mle-05 3.596e-05 2.014e-08, 6.347e--08 0.3 3.242e+OO 7.303e-05 1.969e-04 L385e-07 3.735e--07 0.4 7.53 e-01
'.52 e-05 6.076e-05 4.914e-08, 1.184e--07 0.5 6.762e-02 3-.070e-06 6.790e-06 6.026e-09 1.333e--08 0.6 1.734e+03 1.009e-01 2.085e-01 1.970e-04 4.070e--04 0.8 2.B5e+OO 1.836e-04 3.430e-04 3.492e-07 6.523e--07 1.0 8.315e+OO 9.677e-04 1.68.3e-03 1.784e-06 3.102e--06 1.5 5;_966e+OO 1.197e-03 1.853e-03 2.015e-06 3.117e--06 Totals 1.930 03 l.1034E"-0l 2.l28e-01 2.'IHSE"--04 4.. 151,e..Jo,4 c_
Resutifc<; - D-0-se Point# 2 - 0,25,0,cm Fluenre Rat,e Flueure Rate Exposnl'e Rate Exp o,sure Rate Euel'gy. [eV) Arthity (Photons/sec) M,e\\*lcm2/ser M,e\\*lcm:ther mR/br mR/br o Buildup "' itch. BnHdup o Buildu With Buildup 0.015 2.rn2e+01 2.606e-07
.. 718e-07
- 2. 35e-08, 2.332e--08 0.03 0.04 0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1.0 1.5 Totals 1.B5e+02 1.833e-05 3.388e+Ol 1.413e-05 1.774e+OO 1.398e-06 3.409e+OO 8.940e-06 8,.983e-01 7.178e-06 3,. 42e+OO 4.508e-05 7.534e-01 1.535e-05 6.762e-02 1.847e-06 1.734e+03 6.0lOe-02 2.B5e+OO 1.075e-04 8.315e+OO 5.591e-04 5,.966e+OO 6.740e-04 1.930 03 6.l -6E"-02 2..42 e-05 1.817e-07 2.400e--07 2.. 359e-05
- 6. 5,le-08 1.0*fie--07 3.lOk-06 3.725e-09 8.262e--09 3.060e-05 1.368e-08, 4.681e--08 2..03 *e-05 1.267e-08, 3.586e--08 1.083e-04 8.551e-08, 2.054e--07 3.297e-05 2.991e-08, 6.424e--08 3.653e-06 3.625e-09 7.171e--09 1.115e-01 1.173e-04 2.176e--04 1.817e-04 2.045e-07 3.456e--07 8,.856e-04 1.031e-06 1.632e--06 9.62.3e-04 1.l34e-06 1.619e--06 l.l38e-Ol l.?Ol e--04 2... 220,e..J0,4 3F1025-01 / Enclosure 16 / Page 20 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 20
[
Date By
.[krnShielcl 8.02 Wiblin (8.02,~0000) filename
---J-RnnDate Run Time 6:28:42.!\\M:
JiJu.rntion 00:00:00 CR3 Concrete Thin Diskmsd Ser tember 6 20 5, Case Title Descri.pti.on Geome A
X rrl 0.0 cm (0 in 2
0.0 cm (0 in Shield_
Source Arr Garp Wall Clad l udide Ba-137m eo.. 60 Cs--137 Elll-U2 Elll-154 Proj1,ert Info R..x Concrete Thin Std C 1 0.1 cm depth at 1 and 6 cm 8 - Cylinder Volume - End hields.
Soun:,e Dirmensi!ons 0.1 cm (0.0 in) 28_0 cm I 1 l_O ffi)
Dos,e P,oiuts
\\
z 1.1 cm (0.4 m) 6.1 cm (2..4 m) 0.0 cm (0 in) 0.0 cm (0 in)
' hields Dimension 246.301 cm" 50.0cm
~Iate1i al Concrete i\\.ir Concrete JiJensicy 2.3-3, 0.00122 2.3,3 Soun :,e Input: Groupirng Metbocl - Staud.al'd Indices umber of Gl'oups: 25, L ower Ener gy Cutoff: 0.. 015 Photons < 0.. 015:: Iud uded Library: G1*0\\*,e Ci B
~t C"1 rm],
5,.009 Se--010
- 1. 8.S 35e-t-001 I 2.0339e-006 2.7832e--011 1.02.98e+OOO 1.BOOe-007 5,.2.9S5e--Ol0 1.95 93e-t-001 2.1500e-006 9.6796e--Ol...:
3.5815e-001 3.9300e-008 7.8077e--012 2.88 89e-OO 1 3.HOOe-008 Buildup,: Tl!ie matlerial refer,enre is,, all Oad Inti,t>graticm Parameters Radiarl Cn-rnmfefit~ntiarl Y Direction axial)
Results - IDos,e Point # I - ~0,1.l 0),cm Bq/rmJ, 7.5254e-002 4.1810e-003 7.9550e-002
-I
- 1. 4 54 le-003
-I 1.172.9e-003 30 -
0 -
20 Fluenre Rate Fluence Rate Exposue Ratle Exposure Rate Euel'gJ (l\\:LeV) Artility (Pbotous/sec) MeVk m2ls,er l\\,[,eVlcm 2/s,ec mR/b1*
mR/hr
_ o Buildup,, itb :Buil~lup
_ -o Buildup With Bui!. up 3F1025-01 / Enclosure 16 / Page 21 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 21 R015
_689e-01 3_979e-07 4_071e-07 3-413e-08 3.49 e-08 0_03 L092e+OO L155e-OS
]_ 70e-05 LH4e-07
=-038e-06 4_6 Oe-09 5.429e-09 0.1 2-1&7e-01 l_279e-05 l_538e-05 L956e-O&
.353e-08 0.2 4_6,57e-02 5_644e-06 6-413e-06 9_961e-09
- l. 132e-08 0.3 9_684e-02 l_786e-05 l_973e-05 3_389e-08 3.74 e-08 0.4
_457e-02 6_Wle-06 6_620e-06 L189e-08 1.290e-08 05
-- -646e-03 8-272e-07 8,_8:78e-07 L624e-09 1.743e-09 0.6 L672e+Ol 6_307e-03 6_709e-03 L231e-OS 1.310e-05 0.8
]_764e-01 8-952e-OS 9-412e-05 l _703e-07 l.790e-07 1.0 L 72e+OO 8_]18e-04 8,-473e L496e-06 l.562e-06 1.5 L
'6e+OO l_]86e-03
]_
.3e-03 L995e-06
.058e-06 Totals 8.46le---til3 8.9149e-lil3 l.62:e--05 L *-20,e~o:
C Resil!d ts - Dos,e P0iut, 2 - ~01,~i.l O,cm Fluenre Rat,e FJueure Rate Exp0s1!ll'e Ratie Exposure Rate EuergJ (l\\lle V) Arthity (Pboit,ons/sec) Me,, /,rm2/ser l\\[e \\ * /cm:i-/s,er mR/b:r mR/hr 0_015 0_03 0_04 o_os 0.1
- 0. *'
0.3 0.4 05 0.6 0.8 1.0 15 Totals
_689e-01 L092e+OO s _ 8,3e-01 6_792e-02 J &7e-01 4_6,57e-O 9_684e-02
=-457e-02
=-646e-03 L672e+Ol
]_764e-01 L 7 'e+OO L
'6e+OO o Buildu]! \\"\\ itb Bl!lihlu.p
-o Buildu]!
"With Buildup 3_] 77e-07 3_250e-07 2_725e-08 2.788e-08 7_710e-06 8_:291e-06 7_64le-08 8.216e-08 5_734e-06
,6_21 ',e-06
'_536e-08
.747e-08 9_720e-07
]_044e-06 2_589e-09 2.782e-09 6_602e-06 7_036e-06 LOlOe-08 l.076e-08
'_848e-06
_97 'e-06 5_0 '6e-09
- 5. '45e-09 8-929e-06 9_
.Se-06 L694e-08 l.751e-08 3_031e-06 3_]14e-06 5_905e-09 6.067e-09 4_090e-07 4_]86e-07 8-02:8e-10 8....:17e-10 3_W7e-03 3_]71e-03 6_064e-06 6.189e-06 4-385e-OS 4_458e-05 8-340e-08 8.479e-08 3_960e-04 4_016e 7_ 99e-07 7.402e-07 5_743e-04 5_80 ',e-04 9_663e-07 9.762e-07 4.ll -8e---til.3
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 22 E_Date By l\\linoSbMd 8.02
,, ibliu (8.02-0000)
Ched.:ecl C---
Filename
=I-RnnDate September 6, 2025 Run Time 6:37:36 AM C
Rx Concrete Thick Disk..tnsd Cas.e Title Description Geometry f
Height Radius A
X
- rr 0.0 CID (0 i.u) 1r2 0.0 CID (0 i.u)
I Som*ce :Oirm.ensions Proj1,ert Info Rx Concrete Thick Std Cyl 15 c-m depth at 1 and 6 cm 8 - C li.uder Volwne - End Shields 15.0 CID (5.9 m) 28.0 cm (11.0 in)
Dos-e Points y
16.0 cm (6.3 in) 21.0 C.tll (8.3 in) hi.elcls z
0.0 C.tll (0 in) 0.0 C.tll (0 in Shield N ource Air Gap
- all Clad
- Oi:mension 3.69e+04 cn13 Mate1*ial Concrete Au Concrete
- Densit,
.33 0.00122 2.33 r urlide Ba-B7m Co-60
~
Cs-137 Eu-1l52 Eu-1l54 L
50.0 cm Som*ce Input: Groupirng 1,etbod - Sta:udud Iudires l umber of Grnups: 2 S L&wer Energy Cutoff: 0.. 015 Photons < 0.. 015: Iududed Library: G1*oy,e Ci B91 7.5143e-008
- 2. 7803 e-t-003 l 4.1748e-009 U447e-t-OO...:
1.BOOe-007 7.9432e-008 2.9390e-t-003
- 2. ISOOe-006 1.4519e-009
- 5. 3722e+OO 1 3.9300e-008 1.1712e-009 4.3333e-r001 3.HOOe-008 BuHdup: Tille mattelial 1~eferenre is,vaH Oad Intte1>ration Parameters RadiaJ Circumferential Y Direction
- axtal)
ResnttcS - IDO<Se Point # 1 - 0,16,0) cm Dur11tio,n 00:00:00 Bg_/rm~
7.5254e-002 4.18 rne-003 7.9550e-002 l.454 le-003 U729e-003 30 20 20 Fluenre Rat,e Fluente Rate ExposUl'e Ratte Exposure Rate Ene1*gy (l\\le'V) Arthity (Pho-tons/sec) MeV/,cm2/ser MeV/cm2/s,er m:R/br mR/br
_ o Buildu Vdtb Buildup
-o Buildu With Buildu 3F1025-01 / Enclosure 16 / Page 23 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 23 0_015 4_03,3e+Ol 4_]56e-07 4 __.6Se-07 3,_564e-08 3.661e-08 0_03 l _638e+02
'-406e-05 2_8,34e-05 2_385e-07
.808e-07 0_04 7_925e+Ol 3,_]21e-05 4_332e-05 l_380e-07 1.916e-07 o_os L019e+Ol 7_8,08e-06
] _ 89e-05
'_080e-08, 3.434e-08 0.1 3,_.8le+Ol L075e-04 3_008e-04 l _644e-07 4.602e-07 0.....:
6_985et-OO 6_209e-05
] _ 8i2.9e-04 L096e-07 3.227e-07 0.3 L453et-01 2_ 47e-04 6_096e-04 4_ 62e-07 1.156e-06 0.4 3,_685e+OO 8-470e-05
_] 4e-04 l_650e-07 4.139e-07 05 3_969e-01 L244e-05 2-922e-05
'_44le-08 5.736e-08 0.6 2_507et-03 L014e-Ol 2 __.4Se-O 1 l_979e-04 4.388e-04 0.8 2_646et-01 l_,605e-03 3_257e-03 3_054e-06 6'.194e-06 1.0 L908e+02 L588e-O' 3_0]6e-02
'_928e-05 5.560e-05 1.5 L8,38et-02
'_721e-0_.
4 _,OO'.?Je-02 4_578e-05 7.743e-05 T,o,tals 3.261. 03 1.46 e--lill 3.066e-lill
- 2.
- 4e--lil4 5.,809,e-0,4 Resil!dts - D 0cs:e Point# 2 - i(lil,21,lil) cm Fluenre Rate Flueure Rate Exposm*e Ratl(' Expo,sure Rate Euet'gJ' (_1\\11,e V) Artility (Pbot,o,u,sf SH) M,e\\, lcm2fser 1\\:1,e,,, /cm:i-./s,er mR!b.r mRJhr
_ o Buildul:),, ith Bl!l'f~lup
-o Buildu1
\\\\,'ith Buildupj 0_015 4_033e+Ol 3363e-07 3-45 le-07 2_884e-08, 2.960e-08 0_03
---+--
L638et-02 L961e-05 2-308e-05 L943e-07 2.288e-07 0_04 7_925et-01
'_535e-05 3Sl8e-05 L]21e-07 1.556e-07 o_os L019e+Ol 63 Oe-06
] _041,e-05 L684e-08
.77 e-08 0.1 3,_.81e+Ol 8-592e-05
_362e-04 L315e-07 3.6Be-07
- 0. '
6_985e+OO 4_914e-05
] _391,e-04 8-672e-08 2.455e-07 0.3 L453e+Ol l_766e-04 4_566e-04 3-349e-07 8.661e-07 0.4 3_685 et-00 6_616e-05
] _574e l _289e-07 3.067e-07 0.5 3_969e-01 9_660e-06 2_ ] Se-05 L896e-08, 4.217e-08 0.6 2_507et-03 7_835e-O
]_642e-01 L529e-04 3.205e-04 0.8 2_,646e+Ol L 29e-03
._354e-03 2_337e-06 4.478e-06 1.0 L908e+02 L.05e-O __.
2_]63e-02
....;_222e-05 3.987e-05 1.5 L8,38e+02 2_029e-O' 3-2.Sle-02 3-414e-05 5.470e-05 T,o,tals 3.261. 03 1.!l24e--lill 2.218e-lill 2.12 e--lil4 4.. 218,e-0,4 3F1025-01 / Enclosure 16 / Page 24 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 24 Date l\\:fifl'oSbMd 8.02
,, iblin (8.02.-0000)
Cbed:ed Filename
---+
RnnDate September 6 2025 Rinn Time 7:29:30Al\\lI IDu:rati.on 00:00:00 BOP Concrete Thin Disk.m.sd Case Title Descri.pti.on Geom f
- .Hei.ght R.adi.us r-A X
"1 0.0 cm (0 in)
,.,.2 (LO cm (0 in)
Shield _
Source Ai.r Garp Wall Clad L uclide Ba-137m Co~60 Cs~137 En-152 P1~oj1,ert Info I
BOP Concrete Thin Std Cx!.Q.1 cm dep h at 1 and 6 cm 8 - CyJinde,r Volume - End Shields Sonl'ce Dirrnensions
~
0.1 CID (0.0 in 8.0 CID (!_!0 in)
Dose Points
\\
z 1.1 CID (0.4 in) 6.1 CID (-.4 in) 0.0 cm (0 in) 0.0 cm (0 in)
- bi.elds Dimension
.46.301 cm5 50.0c:m l\\:fate1*ial Concrete Air Concrete Densit}
2.33 0.00122 2.33 Scm1*ce Input: Groupirng l\\:leth.od - Sta oclud Indices
_ umber of Grnup.s: 25 Lower Energy Cutoff: 0.. 015 Photons < 0.015: Iud uded Library: G1*oye Ci t B
~tC"1 rm~
5.3823e-010 1.9915e+001 2.1853e-006 8.9407e-013 3.3081e-002 3.6300e-009 5.6896e-Ol0
- 2. 051e+001 2.3WOe-006 3.3497e-012 l.2394e-O(H 1.3600e-008 Buitidup: The matelial refer,enre is,, ~ U Clad Integration Parameters R.adiaJ Citrcumferenti.al Y Direction, axi.al)
Results - IDose Point # I - 0 1.1 0 cm Bqln n~
8.0855e-002 1.34 3 le-004 8.5470e-002 S.03_0e-004 30 20 20 Fluenre Rate Flueore Rate Exposnl'e Ra.tie Exposure Rate Eue1*gy leV) Arthity (Photons/sec) MeV/n n2/s,er l\\leV/cm2/s-er mR/b:r mR.lhr o Buildup Wittb Bni clop
-o Buildup With Buildup
...L_
2.256e-01 3.338e-07 3.415e-07 2.863e-08 2.929e-08 t 0.015 3F1025-01 / Enclosure 16 / Page 25 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 25 0.03 U73e+OO 1.240e-05 1.365e-05 1.229e-07 1.353e-07 0.04 3.SOle-01 6.361e-06 7.334e-06 2.813e-08
- 3. '44e-08 0.05
.83 e-02 4.682e-07 5.502e-07 1.247e-09 1.466e-09 0.1 3.5 4e-02 2.060e-06 2.478e-06 3.l52e-09 3.791e-09 0.2 9.287e-03
- 1. 26e-06 1..79e-06 1.987e-09 2.257e-09 0.3 3.35le-02
- 6. 82e-06 6.8 7e-06 1.173e-08 1.295e-08 0.4 7.788e-03 1.934e-06 2.099e-06 3.769e-09 4.089e-09 0.5, 6.99le-04
- 2. 86e-07 2.346e-07 4.290e-10 4.605e-10 0.6 1.792e+Ol 6.763e-03 7.194e-03 1.320e-05 1.404e-05, 0.8
__ 207e-02
- 1. 20e-05 1.177e-05 2.130e-08 2.239e-08 1.0 8.6lle~02 S.496e-05 5.737e-05 1.013e-07 1.057e-07 15 6.18.Je-02 S.982e-05 6.l7le-05 1.006e-07 1.038e-07 Tot.als 1.:99:e+0l 6.:9*20e--0.3
.359e-03 L363e--0S 1.450,e-O-c_
ResnHs - IDose Point.. 2 - (0,6.l 0) rm.
Flnenre Rat,e Flueure Rate Exposure Raf,e Exposure Rate Energy (MeV) Arthi ty (Pb&tous/sec) MeVlrm.2/ser.. l,e,.* /cm2/s,er mR!b:r m.R/br
_ o Buil
\\i\\ ith Bnihlu
-o BuilduJ>
With Buildu u
0.015 2.256e-01 2.665e-07 2.727e-07 2.286e-08 2.339e-08 0.03 U73e+OO 8.283e-06 8.908e-06
- 8. 09e-08 8.828e-08 0.0 3.50le-01 3.800e-06
- 4. ll 7e-06 1.681e-08 1.821e-08 0.05
.834e-02 2.624e-07 2.819e-07 6.991e-10 7.509e-l0 0.1 3.524e-02 1.064e-06 1.134e-06 1.627e-09 1.734e-09 0.2 9.287e-03 5.680e-07 5.927e-07 1.002e-09 1.046e-09 0.3 3.35le-02 3.090e-06 3.194e-06 5.862e-09 6.058e-09 0.4 7.788e-03 9.608e-07 9.87le-07 1.872e-09 1.923e-09 0.5, 6.99le-04 1.0Sle-07
- 1. l06e-07 2.121e-10 2.171e-l0 0.6 1.792e+Ol 3.331e-03 3.400e-03 6.502e-06 6.636e-06 0.8 2..207e-02 5.484e-06 5.576e-06 1.043e-08 1.061e-08 1.0 8.6lle-02 2.681e-05 2.719e-05 4.942e-08 5.012e-08 1.5, 6.18.Je-02 2.898e-05 2.927e-05 4.875e-08 4.925e-08 Totals l.:995e+0l 3.4lle--03 3.482e-03
- 6. 44e--06 6... 888e-O6 3F1025-01 / Enclosure 16 / Page 26 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 26
[
Date Filename BOP Concrete Tltic.k Disk.m.sd Case Title Description Geometry By l\\:liffo Shield 8 JL W'ibliu (8.02-000ij)
---+
Run Date Se,ptelllioer 6 025, Proj1ert Info Che,rked Rl!rn Time 7:2' :06AM BOP Concrete Thick Std Cyil 15, cm depth at 1 and 6 c.:rn.
8 - Cylinder Voll!lllie - End Shields f
Hei.@t Radius Som*c,e Dimensions r
lS.O CID (5.9 in) 28.0 cm (11.0 in r--
Dos,e P,o,iuts X
'¥.
z A
,,..1 l
0.0 CID (0 inL 0.0 CID (0 in) 16.0 cm (6.3 inL 0.0 cm (0 in 2LO cm (8.3 in) 0.0 cm (0 in)
Shield N
' ource Air Gap
\\\\.alt Clad l nrUde Ba-137m Co--60 Cs,..137 Elll-lS2 hi.elcls:
Dimension 3.69e+04 c.m' 50.0 cm Material Concrete Au Concmte D,ensitv
_.33 0.00122
.33 Som*ce Input: Grouping 1\\1,etbod - Sta:nd.a *d Iu~lices
_ nmber o:f Groups: 2 5 Lower Energy Cutoff: 0...015 Photons < 0,.015 Iudnded Liibra11*: Gn)n Ci.
B JtC1 C'ID3 8.0735e-008 2..98,72e+003, i 2.18S3e-006
- 1. 3411 e-010 4.9621 e+OOO 3.6300e-009 8.5343e-008
- 3. 577e+003 2.3l00e-006 S.0245e-Ol0 l.8591e+001 1.3600e-008 BnHdnp: The matterial refer,enre is,, 111H Cl111d Inttegratiou Paira meter Radial Ciirrnmfemntiai Y Dn,ec.tion axial)
Re nUs - D0cse Point# l -, O,Hi,Q) n:m.
Duration 00:00:00 Bqlrm3 8,.0855e-00:2.
1.3431,e-004 8,_5470e-00:2.
5.032.0e-004 30 20 20 Flu,enre Ra.lie Flueuce Rate Exposn *e Ratte Exposure Rate Eue 'ID'
[,e\\1 Arthi.ty (Pholiou.s/sec) MeVk m2/s.er [e,.*/cm2/s,er mR/h:r mR/hr o Buildup,, ilth Bnilf~lup
-o Buildup W Uh Buildup
[
0.015, _l_ 3,.384e+Ol 3.486e-07 3.58,1,e-07 2.990e-08 3.071e-08 3F1025-01 / Enclosure 16 / Page 27 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 27 0.03
- 1. 759e-s-02 2.585e-05 3.044e-05
'.562e-07 3.017e--07 0.04
- 5. 5...:e+Ol
.:.:.068e-05
.8.71e~05 9.148e-08
- 1. 70e.J07 0.05 2.750e+OO 2.108e-06 3.480e-06, 5.615e-09 9.270e.J09 0.1 5.286e-3/4OO 1.73-le-05 4.846e-05 2.649e-08.
7.414e.J08
- 0.
1.393e+OO 1.238e-05 3.647,e-05 2.186e-08, 6.437e.J08 OJ.
5.027e+OO 7.775e-05 2.109e-04 1.475e-07 4.00le.J07 0.4 1.168e+OO 2.685e-05 6.734e-05 5.232e-08 1.312e-07 0.5 1.049e-01 3.287e-06 7.722e-06, 6.451e-09 1_5;16e-08 0.6 2.689e-3/403 1.087e-01
_..4rne-01 2.L.:.:e-04 4.705e-04 0.8 3.310e+OO 2.008e-04 4.073e-04 3.8,19~ 7 7.74Se-07 1.0
- 1..9.:.:e+Ol 1.075e-03
_._04.:.:e-03 1.98.:.:e-06 3.764e-06 1.5
- 9..75e+OO 1.373e-03
__ J_.2,e-03
'.310e-06 3.906e-06 T,o,tals 2.992. 03 l.l 16e-(!ll
!.4*62,e-lJJ 1 2.16~4 4.8U,e..J04 Re il!llfLS: - Dose Point# 2 - lil,11,IJJ),cm Flu,enre Rat,e Flueure Rate Exp~stue Ra.tue Expo,sure Rate Eue1*g:y (M,eV) Arth;ty (Photons/ ec) M,e\\* /,rm1/ser I\\ll,e,rtcm1/s,er mR/hr mR/hr
_ o Buildu1 \\1\\ itb Bil!l"fdup No Buildu With Buildup_
0.015 3.384e+Ol 2.8;2:le-07
.&95e-07 2.420e-08 2.483e.J08 0.03 1.759e-s-02
.107e-05
__ 48,0e-05 2.088e-07 2.458e.J07 0.04 5,. 52e+Ol 1.680e-05
.33 le-05 7.430e-08 1.031e.J07 0.05 2.750e-3/4OO 0.1 5.286e+OO 0.2 1.393e+OO OJ.
5.027e+OO 0.4 1.168e+OO 0.5 1.049e-01 0.6
'.689e+03, 0.8 3.310e+OO 1.0
- 1. 9.:.:e+Ol 1.5
- 9. 75e+OO T,otals 2.992e+03 1.706e-06 2.809e-06, 1.384e-05 3.805e-05 9.8,00e-06 2.775e-05 6.H Oe-05 1.580e~04 2.097e-05 4.9.90e-05 2.55de-06 5.677e-06 8.40 e-0 1.760e-01 1.537e-04
.945e-04 8.160e-04 1.465e~03 1.02:4e-03 1.640e-03 8.616e-(ll!
I. 918e-li)l 4.545e-09 2.118e-08, 1.730e-08 1.159e-07 4.087e-08 5.01 l e-09 1.640e-04 2.923e-07 1.504e-06 1.1.:.:e-06 1.680~4 7.484e.J09 5.8 [e.J08 4.897e.J08 2.997e-07 9.723e-08 1.114e-08 3.436e-04 5.601e.J07 2.700e.J06 2.760e.J06
- 3. - li)5,e..J04 3F1025-01 / Enclosure 16 / Page 28 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 28 Date By l\\ficroSbield 8.02
,1Viblin (8.,0,2,-0000)
E FUename R.uu IDat<e Rnn Time Du:rnOon 00:00:00 Discharge Ca!llal e.d:iment 1 cm.msd Sq1ten ber,6 2025 7:39:15."1\\11 C11se Title Desc.ri tion Geom.etry Proj1,ect Info Disc Canal Sediment S d Cy] 15, cm depth at 1 8-Cyli.oderVolume - End Shields f
Soni*t,e Dirmeusirous Height r 15.0 cm (5.9 m Radius 2,8.0 c.m, 11.0 in)
A X
Dos,e Points
\\:
z 1
0.0 cm (0 in 16.0 cm (6.3. in) 0.0 cm (0 m)
Shield l Source Ai.I Gap
\\\\all Clad nclide-Ba-137m Co~60 Cs-137 Eu-154 bi.elcl.s Dimension 3.69e+04 cm3 50.0c.m Material FGR-12 Soil i\\ir FGR-2 Soil De~*
L7 0.001.2 L7 Som*ce Input: Grouping l\\:llefibod - Stand,ud Indices
_ umber of Grnups: 25 Ci.
9.4016e-009 5,.2093e-008 9.9382e-009 8.8299e-010 Lo,we-r Energy Cutoff: 0... 015 Photons< 0 015:: Iudnded Library: Gro,*,e Bq 3.4786e+002 L9274e+003, 3.6771e+002 3.2!671 e+OO 1 rtC" CID3
'.:5447e-007 1.4100e-006 2.6900e-007
...:.3900e-008 BnHdnp: The material reference i.s \\1\\ aH Clad Intt~raricm Parameters RadfaJ Crrcumfeientiail Y Di.rec.tion (axial)
Results Bqlcm 3 9.4155e-003 5.2170e-002 9.953 Oe-003 8,.8430e-004 30 0
20 Fluence Rat,e Flueure Rate Exposm-e Ra.tie Exposure Rate Euel'gJ (1\\1,eV) Arthity (Pb@ton.sfsec) M,eV/,cm2/~er._'.[,e\\*lcm2/s,er mRJlu mRlhr 0.03 +/-
6.105e+OO
...:.049e+Ol
_ o Buildup_ \\1\\'irfih BnHclup
-o Buildup With BuilduJ>
9.574e-08 1.00k-07 8.212e-09 8.588e-09 4.305e-06 S.68,8e-06 4.267e-08, 5.637e-08 3F1025-01 / Enclosure 16 / Page 29 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 29 0_04 l_l48e+Ol 6_282e-06 L054e-05 2_778e-08, 4.659e-08 0_05 L689e+OO L763e-06 3_95&e-06 4_696e-09 1.054e-08 0.1 L322e+Ol 4_697e-05 l-711e-04 7_l86e-08 2.617e-07 0.2 2_231e+OO
- -519e-05 8,_ l47e-05 4_445e-08, 1.438e-07 0.4
-331,e-01 6_993e-06 l_745e-05 l _363e-08, 3.400e-08 05 7_074e-02 2_8,SSe-06 6_621e-06 5_669e-09 lJOOe-08 0.6 3_l60e+02 1_65,Se-02 3.553e-02 3.237e-05 6.935e-05 0.8 L274e+Ol 9.941e-04 l.924e-03 L8,91e-06 3.660e-06 1.0 L937e+03
.056e-Ol 3.700e-01 3.789e-04 6.820e-04 1.5 L940e+03 3.585e-Ol 5.723e-01 6.032e-04 9.628e-04 Totals 4.?62e+03
- .. U.8e-Ol 9
1.-8iDOe-Ol 1.01 e-03 L 18,e..!03 3F1025-01 / Enclosure 16 / Page 30 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 30 ATTACHMENT 2 - MARSAME CPMR, ERC, and Efficiency Calculations Table of Contents Table 13 - MARSAME CPMR, ERC and Efficiency for Soil at 1 cm......................................31 Table 14 - MARSAME CPMR and ERC for Soil at 10 cm.......................................................32 Table 15 - MARSAME CPMR and ERC for Reactor 0.1 cm thickness at 1 cm.....................33 Table 16 - MARSAME CPMR and ERC for Reactor 0.1 cm thickness at 6 cm.....................34 Table 17 - MARSAME CPMR and ERC for Reactor 15 cm thickness at 1 cm......................35 Table 18 - MARSAME CPMR and ERC for Reactor 15 cm thickness at 6 cm......................36 Table 19 - MARSAME CPMR and ERC for BOP 0.1 cm thickness at 1 cm height...............37 Table 20 - MARSAME CPMR and ERC for BOP 0.1 cm thickness at 6 cm height...............38 Table 21 - MARSAME CPMR and ERC for BOP 15 cm thickness at 1 cm Height...............39 Table 22 - MARSAME CPMR and ERC for BOP 15 cm thickness at 6 cm...........................40 Table 23 - MARSAME CPMR and ERC for Discharge Canal Sediment at 1 cm...................41 Please refer to MARSAME [5] for process. The following terms apply to all tables:
FRER fluence rate to exposure rate P
Probability of interaction RDR Relative Detector Response CPM Counts per minute R
Exposure rate (microR/hour)
WS Weighted instrument efficiency (counts per minute per microroentgen per hour [cpm per R/h])
cm2/g square centimeters per gram 3F1025-01 / Enclosure 16 / Page 31 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 31 Table 13 - MARSAME CPMR, ERC and Efficiency for Soil at 1 cm Energy (keV)
Mass Attenuation Coefficient
- Air (cm2/g)
FRER Mass Attenuation Coefficient
- NaI cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 3.48E-05 0
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 3.54E-04 3
40 0.06883 0.3632 18.8 1.0000 0.3632 6779 1.56E-04 3
50 0.04098 0.4880 10.5 1.0000 0.4880 9109 1.25E-05 0
60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 7.59E-05 1
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 6.35E-05 1
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 3.74E-04 2
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 1.18E-04 0
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 1.33E-05 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 4.07E-01 979 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 6.52E-04 1
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 3.10E-03 4
1500 0.02547 0.0262 0.047 0.8143 0.0213 398 3.12E-03 3
2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 4.15E-01 998 3F1025-01 / Enclosure 16 / Page 32 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 32 Table 14 - MARSAME CPMR and ERC for Soil at 10 cm.
Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient -
NaI (cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 2.33E-05 0
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 2.40E-04 2
40 0.06883 0.3632 18.8 1.0000 0.3632 6779 1.04E-04 2
50 0.04098 0.4880 10.5 1.0000 0.4880 9109 8.26E-06 0
60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 4.68E-05 1
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 3.59E-05 0
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 2.05E-04 1
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 6.42E-05 0
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 7.17E-06 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 2.18E-01 523 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 3.46E-04 1
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 1.63E-03 2
1500 0.02547 0.0262 0.047 0.8143 0.0213 398 1.62E-03 2
2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 2.22E-01 534 3F1025-01 / Enclosure 16 / Page 33 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 33 Table 15 - MARSAME CPMR and ERC for Reactor 0.1 cm thickness at 1 cm Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient
- NaI (cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 3.49E-05 2
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 1.26E-04 30 40 0.06883 0.3632 18.8 1.0000 0.3632 6779 4.90E-05 19 50 0.04098 0.4880 10.5 1.0000 0.4880 9109 5.43E-06 3
60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 2.35E-05 11 150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 1.13E-05 2
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 3.74E-05 5
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 1.29E-05 1
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 1.74E-06 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 1.31E-02 760 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 1.79E-04 8
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 1.56E-03 53 1500 0.02547 0.0262 0.047 0.8143 0.0213 398 2.06E-03 48 2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 1.72E-02 942 3F1025-01 / Enclosure 16 / Page 34 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 34 Table 16 - MARSAME CPMR and ERC for Reactor 0.1 cm thickness at 6 cm Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient -
NaI (cm2/g)
P RDR CPM per R/hr Ri (µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 2.79E-05 2
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 8.22E-05 19 40 0.06883 0.3632 18.8 1.0000 0.3632 6779 2.75E-05 11 50 0.04098 0.4880 10.5 1.0000 0.4880 9109 2.78E-06 1
60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 1.08E-05 5
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 5.25E-06 1
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 1.75E-05 2
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 6.07E-06 1
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 8.22E-07 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 6.19E-03 359 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 8.48E-05 4
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 7.40E-04 25 1500 0.02547 0.0262 0.047 0.8143 0.0213 398 9.76E-04 23 2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 8.17E-03 453 3F1025-01 / Enclosure 16 / Page 35 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 35 Table 17 - MARSAME CPMR and ERC for Reactor 15 cm thickness at 1 cm Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient -
NaI (cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 3.66E-05 0
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 2.81E-04 2
40 0.06883 0.3632 18.8 1.0000 0.3632 6779 1.92E-04 2
50 0.04098 0.4880 10.5 1.0000 0.4880 9109 3.43E-05 1
60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 4.60E-04 6
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 3.23E-04 2
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 1.16E-03 4
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 4.14E-04 1
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 5.74E-05 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 4.39E-01 754 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 6.19E-03 8
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 5.56E-02 56 1500 0.02547 0.0262 0.047 0.8143 0.0213 398 7.74E-02 53 2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 5.81E-01 890 3F1025-01 / Enclosure 16 / Page 36 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 36 Table 18 - MARSAME CPMR and ERC for Reactor 15 cm thickness at 6 cm Energy (keV)
Mass Attenuation Coefficient
- Air (cm2/g)
FRER Mass Attenuation Coefficient -
NaI (cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 2.96E-05 0
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 2.29E-04 2
40 0.06883 0.3632 18.8 1.0000 0.3632 6779 1.56E-04 2
50 0.04098 0.4880 10.5 1.0000 0.4880 9109 2.77E-05 0
60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 3.61E-04 5
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 2.46E-04 1
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 8.66E-04 3
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 3.07E-04 1
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 4.22E-05 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 3.21E-01 551 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 4.48E-03 6
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 3.99E-02 40 1500 0.02547 0.0262 0.047 0.8143 0.0213 398 5.47E-02 37 2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 4.22E-01 649 3F1025-01 / Enclosure 16 / Page 37 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 37 Table 19 - MARSAME CPMR and ERC for BOP 0.1 cm thickness at 1 cm height Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient -
Na(cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 2.93E-05 2
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 1.35E-04 38 40 0.06883 0.3632 18.8 1.0000 0.3632 6779 3.24E-05 15 50 0.04098 0.4880 10.5 1.0000 0.4880 9109 1.47E-06 60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 3.79E-06 2
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 2.26E-06 1
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 1.30E-05 2
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 4.09E-06 0
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 4.61E-07 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 1.40E-02 967 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 2.24E-05 1
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 1.06E-04 4
1500 0.02547 0.0262 0.047 0.8143 0.0213 398 1.04E-04 3
2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 1.45E-02 1035 3F1025-01 / Enclosure 16 / Page 38 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 38 Table 20 - MARSAME CPMR and ERC for BOP 0.1 cm thickness at 6 cm height Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient -
NaI (cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 2.34E-05 2
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 8.83E-05 25 40 0.06883 0.3632 18.8 1.0000 0.3632 6779 1.82E-05 9
50 0.04098 0.4880 10.5 1.0000 0.4880 9109 7.51E-07 60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 1.73E-06 1
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 1.05E-06 0
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 6.06E-06 1
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 1.92E-06 0
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 2.17E-07 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 6.64E-03 457 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 1.06E-05 1
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 5.01E-05 2
1500 0.02547 0.0262 0.047 0.8143 0.0213 398 4.93E-05 1
2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 6.89E-03 498 3F1025-01 / Enclosure 16 / Page 39 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 39 Table 21 - MARSAME CPMR and ERC for BOP 15 cm thickness at 1 cm Height Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient -
NaI (cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 3.07E-05 0
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 3.02E-04 3
40 0.06883 0.3632 18.8 1.0000 0.3632 6779 1.27E-04 2
50 0.04098 0.4880 10.5 1.0000 0.4880 9109 9.27E-06 60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 7.41E-05 1
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 6.44E-05 0
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 4.00E-04 2
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 1.31E-04 0
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 1.52E-05 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 4.71E-01 978 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 7.75E-04 1
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 3.76E-03 5
1500 0.02547 0.0262 0.047 0.8143 0.0213 398 3.91E-03 3
2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 4.80E-01 995 3F1025-01 / Enclosure 16 / Page 40 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 40 Table 22 - MARSAME CPMR and ERC for BOP 15 cm thickness at 6 cm Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient -
NaI (cm2/g)
P RDR CPM per R/hr Ri (µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 2.48E-05 0
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 2.46E-04 2
40 0.06883 0.3632 18.8 1.0000 0.3632 6779 1.03E-04 1
50 0.04098 0.4880 10.5 1.0000 0.4880 9109 7.48E-06 60 0.03041 0.5481 6.45 1.0000 0.5481 10229 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 5.82E-05 1
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 4.90E-05 0
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 3.00E-04 1
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 9.72E-05 0
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 1.11E-05 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 3.44E-01 714 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 5.60E-04 1
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 2.70E-03 3
1500 0.02547 0.0262 0.047 0.8143 0.0213 398 2.76E-03 2
2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 3.51E-01 727 3F1025-01 / Enclosure 16 / Page 41 of 42
ADP CR3, LLC 15760 West Power Line Street l Crystal River, FL 34428 P a g e 41 Table 23 - MARSAME CPMR and ERC for Discharge Canal Sediment at 1 cm Energy (keV)
Mass Attenuation Coefficient -
Air (cm2/g)
FRER Mass Attenuation Coefficient -
NaI (cm2/g)
P RDR CPM per R/hr Ri
(µR/h)
WSi (cpm per
µR/h) 15 1.334 0.0500 47.4 1.0000 0.0500 933 8.59E-06 0
20 0.5389 0.0928 21.8 1.0000 0.0928 1732 0
30 0.1537 0.2169 7.36 1.0000 0.2169 4048 5.64E-05 0
40 0.06883 0.3632 18.8 1.0000 0.3632 6779 4.66E-05 0
50 0.04098 0.4880 10.5 1.0000 0.4880 9109 0
60 0.03041 0.5481 6.45 1.0000 0.5481 10229 1.05E-05 0
80 0.02407 0.5193 3
1.0000 0.5193 9692 0
100 0.02305 0.4338 1.67 1.0000 0.4338 8097 2.62E-04 1
150 0.02496 0.2671 0.611 1.0000 0.2671 4985 0
200 0.02672 0.1871 0.328 1.0000 0.1871 3492 1.44E-04 0
300 0.02872 0.1161 0.166 0.9974 0.1158 2160 0
400 0.02949 0.0848 0.117 0.9849 0.0835 1558 3.40E-05 0
500 0.02966 0.0674 0.095 0.9667 0.0652 1217 1.30E-05 0
600 0.02953 0.0564 0.0822 0.9474 0.0535 998 6.94E-02 40 662 0.02931 0.0515 0.0766 0.9357 0.0482 900 0
800 0.02882 0.0434 0.0675 0.9109 0.0395 737 3.66E-03 2
1000 0.02789 0.0359 0.0588 0.8783 0.0315 588 6.82E-01 233 1500 0.02547 0.0262 0.047 0.8143 0.0213 398 9.63E-01 223 2000 0.02345 0.0213 0.0415 0.7738 0.0165 308 0
Total 1.72E+00 500 3F1025-01 / Enclosure 16 / Page 42 of 42