ML17129A326

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TSD-14-015, Rev. 1 - Buried Pipe Dose Modeling and Dcgls
ML17129A326
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Site: Zion  File:ZionSolutions icon.png
Issue date: 03/04/2017
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ZionSolutions
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ZS-2016-0022
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Technical Support Document TSD 14-015 Buried Pipe Dose Modeling & DCGLs Revision 1 Originator: __(signature on file) __________________ Date: _3/04/16___________

David Fauver Reviewer: __(signature on file)___________________ Date:_3/04/16___________

Harvey Farr Approval: __(signature on file)___________________ Date: _3/07/16___________

Robert F. Yetter Page 1 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 Summary of Changes in this Revision:

Revision. 1 - Rewrite, revised calculation method for buried pipe DCGLs to apply insitu and excavation dose assessment scenarios that include all buried pipe. Revised the DCGL approach in Revision 0 to be a DCGLEMC vale.

Page 2 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 Table of Contents

1. PURPOSE ...................................................................................................................................... 5
2. DISCUSSION ................................................................................................................................ 5 2.1. Buried Piping Radionuclides of Concern ...............................................................................5 2.2. Soil DCGLs .............................................................................................................................6 2.3. End State Buried Piping ..........................................................................................................6
3. CALCULATIONS ......................................................................................................................... 7 3.1. Buried Pipe RESRAD Model for Excavation Scenario ..........................................................7 3.2. Buried Pipe RESRAD Model for Insitu Scenarios .................................................................7 3.3. Buried Pipe RESRAD Results ................................................................................................8 3.4. Buried Pipe DCGLs ................................................................................................................9
4. Buried Pipe Elevated Measurement Criteria................................................................................ 10 4.1. Individual Buried Pipe Excavation Scenario ........................................................................11 4.2. Buried Pipe Surface Activity Concentrations Corresponding to Soil DCGLs .....................11 4.2.1. Soil Area Factors for Buried Pipe Volumes at 20 m Length ................................................13 4.2.2. Calculation of BPDCGLEMC .................................................................................................14
5. CONCLUSION ............................................................................................................................ 16
6. REFERENCES ............................................................................................................................ 17
7. ATTACHMENTS ........................................................................................................................ 17 7.1. Attachment 1 - Buried Piping Inventory ..............................................................................17 7.2. Attachment 2 - Schedule 40 Steel Pipe Sizes & Dimensions ..............................................25 7.3. Attachment 3 - Buried Piping Surface Activity Calculations ..............................................26 7.4. Attachment 4 - Determination of Area Factors for Specific Surface Areas .........................48 7.5. Attachment 5 - Determination of Area Factors and DCGLs for Various Diameter Pipes at 20 m Length.............................................................................................................53 7.6. Attachment 6 - RESRAD Summary Report for ZSRP Buried Piping Excavation Scenario..............................................................................................................54 7.7. Attachment 7 - RESRAD Summary Report for ZSRP Buried Piping Insitu Unsaturated Scenario ............................................................................................................55 7.8. Attachment 8 - RESRAD Summary Report for ZSRP Buried Piping Insitu Saturated Scenario ................................................................................................................56 7.9. Attachment 9 - Buried Pipe DCGL Calculation...................................................................57 Page 3 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 List of Tables Table 1 - Soil DCGLs for 0.15 and 1 m Contaminated Zone Thickness ............................................ 6 Table 2 - RESRAD DSR Results for Buried Pipe Dose Assessment to Support DCGL Development............................................................................................................ 9 Table 3 - Maximum Summed RESRAD DSRs from Excavation and Insitu Scenarios ..................... 9 Table 4 - Buried Pipe DCGLs ............................................................................................................ 10 Table 5 - Summary of Surface Activity Levels for Buried Piping Corresponding to Surface Soil DCGL Concentrations ............................................................................................... 13 Table 6 - Surface Soil Area Factors .................................................................................................. 14 Table 7 - Soil Area Factors for ROC Based on Pipe Diameters at 20 Meters Length ...................... 15 Table 8 - Buried Piping DCGLEMC for Various Buried Pipe Diameters at 20 Meters Length ......... 16 List of Figures Figure 1 - Buried Piping Excavation Scenario based on NUREG 1757, Vol. 2 Appendix J guidance. ....................................................................................................... 11 Figure 2 - Buried Piping Excavation Calculation Example ............................................................... 12 Page 4 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1

1. PURPOSE The purpose of this Technical Support Document (TSD) is to establish the Derived Concentration Guideline Levels (DCGLs), in units of disintegrations per minute per one hundred square centimeters (dpm/100 cm2), for the internal surfaces of buried piping at Zion. Buried piping is defined as piping contained in soil as opposed to embedded piping which is contained within concrete floors of structures.
2. DISCUSSION The Zion Site Restoration Project (ZSRP), Exhibit C, Lease Agreement, section 8.5 titled Removal of Improvements; Site Restoration integral to the Zion Nuclear Power Station, Units 1 and 2 Asset Sale Agreement requires the demolition and removal of all on-site buildings, structures, and components to a depth of at least three feet below grade. Several minor structures such as the Switchyard, the ISFSI warehouse, the microwave tower, and the Sewage Lift Station, as well as all roadways and rail lines, will remain at license termination as requested by Exelon. The major structures that will remain at license termination are the basements of the Unit 1 Containment Building, Unit 2 Containment Building, Auxiliary Building, Turbine Building, Waste Water Treatment Facility (WWTF), the lower portion of the Spent Fuel Pool (SFP), the Fuel Transfer Canal, Crib House and Forebay, Unit 1 and Unit 2 Steam Tunnels and the Circulating Water Intake and Discharge Piping below the 588 foot elevation. All systems, components as well as all structures above the 588 foot elevation (with the exception of the minor structures previously noted) will be removed during the decommissioning process and disposed of as a waste stream.

A range of below ground piping will also remain at license termination. The piping will fall into one of three categories: buried, embedded and penetrations. Buried piping is below ground pipe located outside of structures and basements and buried in soil. Embedded piping is defined as piping that is located, or embedded, in the concrete basement floors. Penetrations are the portions of various systems piping remaining within building walls, floors, and ceilings after all systems and piping are removed from building interiors.

This TSD provides the method for calculating the dose to the Average Member of the Critical Group (AMCG) from any remaining buried piping associated with the ZSRP and the corresponding DCGLs to demonstrate compliance with 10 CFR 20 Subpart E, (1). . TSD 14-010, RESRAD Dose Assessment for Basement Fill Model, calculates site-specific DCGLs for soils, (2). The list of radionuclides of concern (ROC) was evaluated using Reactor Buildings (Units 1 and 2), Auxiliary Building, and Turbine Building concrete core analysis data by evaluating the dose significance of each radionuclide in the end state model. The list of ROCs was evaluated in TSD 14-019, Radionuclides of Concern for Basement Fill Model Source Term and Surrogate Ratios, (3).

2.1. Buried Piping Radionuclides of Concern The results of surface and subsurface soil characterization in the impacted area surrounding ZNPS indicate that there is minimal residual radioactivity in soil. Based on the characterization survey results to date, ZSRP does not anticipate the presence of significant soil contamination in any remaining subsurface soil that has not yet been characterized. In addition, based on process knowledge, minimal contamination is expected in any of the buried piping that ZSRP plans to abandon in place. Consequently, due to the absence of any significant source term in soil or in buried piping, the suite of ROC and radionuclide mixture derived for the Auxiliary Building Page 5 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 concrete was considered to be a reasonably conservative mixture to apply to soils and buried piping for FSS planning and implementation.

To date, with the exception of some Turbine Building basement drains, samples from site piping systems have not been collected. The buried piping that is intended to remain is from support systems where process knowledge and historical operation surveys indicate an extremely low probability of residual contamination. ZSRP is currently using activity from Auxiliary Building structural concrete core samples to represent the radionuclide mixture that will remain within buried piping. These cores were obtained at locations with high contact dose rates and/or evidence of leaks/spills. They are therefore heavily biased toward locations with high concentrations of radionuclides in the concrete. Based upon the analysis, as described in TSD 14-019, it was determined that Co-60, Ni-63, Sr-90, Cs-134 and Cs-137 accounted for 99.4% of all dose in the contaminated concrete mixes, (3) The remaining radionuclides of concern from the original radionuclide suite were eliminated due to insignificant dose consequence.

2.2. Soil DCGLs Site-specific DCGLs were calculated for soil in TSD 14-010, (2). Soil DCGLs are used as inputs to parts of the Buried Pipe DCGL calculation. The site-specific soil DCGLs from Table 11 of TSD 14-010 (2) are reproduced in Table 1.

Table 1 - Soil DCGLs for 0.15 and 1 m Contaminated Zone Thickness Soil DCGL (pCi/g)a Radionuclide 0.15 m Thickness 1.0 m Thickness Co-60 4.7 3.8 Cs-134 7.5 4.9 Cs-137 15.8 8.6 Ni-63 3995 848.6 Sr-90 14.4 1.9 a

Soil DCGLs from TSD 14-010 prior to adjustment for removal of insignificant dose contributor radionuclides 2.3. End State Buried Piping Buried piping, with internal diameters ranging from one-inch to 42 inches (not including the Circulating Water Intakes and Discharge Pipes from Units 1 and 2 and 48 inch Service Water Headers), are expected to remain on site. The current buried piping inventory is provided as Attachment 1. The inventory will be updated, as necessary, with future findings. None of the buried piping listed in Attachment 1 is associated with systems involving reactor coolant and therefore, based on process knowledge, are not expected to be significantly contaminated, containing trivial or no residual radioactive material.

Embedded conduit is also listed in Attachment 1 for completeness. The conduit was installed during initial construction prior to the internal contamination of systems; therefore, the interior surface of conduit is not expected to be contaminated unless installation occurred after ZNPS startup. The same applies to the interior and exterior of duct boxes. Underground electrical equipment vaults, electrical manholes, and associated components will be evaluated on a case by case basis with consideration given for contamination potential due to flooding or other mechanisms where contamination could have been introduced into the vault. Storm drains will also be evaluated Page 6 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 considering runoff flow paths and regional topography relative to the contamination potential of the immediate area that could influence the drainage.

3. CALCULATIONS The buried pipe DCGL is determined for two scenarios; assuming that all pipe is excavated and assuming that all pipe remains insitu. Although unrealistic, for the purpose of the bounding modeling approach used the dose from the two scenarios is summed to determine the Buried Pipe DCGL.

The excavation scenario assumes that all buried pipe is excavated and all activity on the internal surfaces of the pipes instantly released and mixed with surface soil. The insitu scenario assumes that all of the buried piping remains insitu. Two separate insitu calculations were performed. The first assumes that all pipes are located at 1 m below the ground surface and the second assumes that all pipes are located in the saturated zone.

To determine the final Buried Pipe DCGLs the Excavation scenario dose is added to the Insitu scenario dose. To ensure conservatism the maximum insitu dose from either of the two scenarios, saturated and unsaturated, are used in the buried pipe DCGL calculation 3.1. Buried Pipe RESRAD Model for Excavation Scenario The Excavation scenario assumes that all of the buried piping is excavated, brought to the surface and spread over a contiguous area equal to the internal surface area of the pipe. After being brought to the surface all of the activity on the internal surfaces of the pipe is assumed to instantly release and mix in a 0.15 m depth of surface soil.

RESRAD modeling is used to determine the dose from excavated buried pipe in units of mrem/yr per pCi/g. The RESRAD parameters used are the same as those used for surface soil DCGLs (see LTP Chapter 6, Attachment 4) with the following exceptions:

Area of Contaminated Zone 2153 m2 Length Parallel to Flow 46 m Cover Depth 0m Contaminated Zone Thickness 0.15 m Unsaturated Zone Thickness 3.45 m The Area of Contaminated Zone parameter is equal to the total internal surface are of all buried pipe as shown in Attachment 1. The length parallel to flow is the square root of the contaminated area under a nominal assumption that the shape of the contaminated area is square. The bases for the remaining parameters are self-explanatory.

3.2. Buried Pipe RESRAD Model for Insitu Scenarios The Buried Pipe Insitu scenarios assume that the pipe remains in place. Two insitu geometries are evaluated. One scenario assumes that the buried pipe is in the unsaturated zone and a second scenario assumes that the pipe is in the saturated zone.

For the Insitu Unsaturated Zone scenario, the pipes are assumed to be located 1 m below the ground surface. The ZSRP decommissioning approach calls for removal of all material, including piping, to Page 7 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 3 feet below grade. Note that portions of the storm drain system that will remain in palce and functional after license termination are closer to the surface than 1 m but this minor exception is considered insignificant. Assuming that the pipe is within 1m of the surface allows the roots (with an assumed depth of 1.22 m in RESRAD) to penetrate the 0.15 m thick insitu source which maximizes dose.

The RESRAD parameters used for the Buried Pipe Unsaturated Zone Insitu scenario are the same as those used for surface soil DCGLs (see LTP Chapter 6, Attachment 4) with the following exceptions:

Area of Contaminated Zone 2153 m2 Length Parallel to Flow 46 m Cover Depth 1m Contaminated Zone Thickness 0.15 m Unsaturated Zone Thickness 2.45 The second insitu scenario evaluated assumed that all buried pipe is in the saturated zone. This scenario is intended to conservatively address the possibility that GW could possibly enter some portions of the buried piping.

The RESRAD parameters used for the Buried Pipe Saturated Zone Insitu scenario are the same as those used for surface soil DCGLs (see LTP Chapter 6, Attachment 4) with the following exceptions:

Area of Contaminated Zone 2153 m2 Length Parallel to Flow 46 m Cover Depth 3.6 m Contaminated Zone Thickness 0.15 m Unsaturated Zone Thickness 0m Contaminated Fraction Below the Water Table 1 3.3. Buried Pipe RESRAD Results Three RESRAD runs were performed for the Buried Pipe; Excavation Scenario, Insitu Unsaturated Scenario, and Insitu Saturated Scenario. The RESRAD summary reports are provided in Attachments 6, 7, and 8, respectively. The RESRAD Dose to Source Ratio (DSR) results are summarized in Table 2.

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TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 Table 2 - RESRAD DSR Results for Buried Pipe Dose Assessment to Support DCGL Development Insitu Insitu Excavation Unsaturated Saturated Radionuclide (mrem/yr per (mrem/yr per (mrem/yr pCi/g) pCi/g) per pCi/g)

Co-60 4.942E+00 3.790E-02 5.289E-04 Cs-134 2.787E+00 6.115E-02 2.654E-03 Cs-137 1.200E+00 4.854E-02 2.107E-03 Ni-63 9.311E-04 7.743E-04 2.519E-04 Sr-90 6.465E-01 6.366E-01 1.379E+00 3.4. Buried Pipe DCGLs The Buried Pipe DCGL is determined by first calculating the pCi/g concentration in the 0.15 m soil mixing layer that corresponds to a unit concentration, 1 dpm/100 cm2, on the pipe surface. The second input to the DCGL calculation is the sum of the DSR for Excavation and the maximum DSR for the Insitu Scenarios. As seen in Table 2, the maximum Insitu DSR is from the Unsaturated Scenario for all radionuclides except Sr-90. Therefore, the DSR summation used in the Buried Pipe DCGL calculation is comprised of the Excavation and Insitu Unsaturated Scenario DSRs for all radionuclides except Sr-90 which is based on the summation of the Excavation and Insitu Saturated Scenario DSRs. The summed DSRs are shown in Table 3.

Table 3 - Maximum Summed RESRAD DSRs from Excavation and Insitu Scenarios Maximum Summed DSR Radionuclide Excavation + Insitu (mrem/yr per pCi/g)

Co-60 4.980E+00 Cs-134 2.848E+00 Cs-137 1.249E+00 Ni-63 1.705E-03 Sr-90 2.026E+00 The dpm/100 cm2 per pCi/g conversion factor is used with the maximum summation DSR in Table 3 to calculate the Buried Pipe DCGL as shown in Equation 1.

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TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 Equation 1 2

BP DCGL = 1/Max Summed DSR * (dpm/100 cm ) / (pCi/g)

  • 25 mrem/yr where:

BP DCGL = Buried Pipe DCGL (dpm/100 cm2)

Max Summed DSR = Maximum Summed DSR values from Table 3 (pCi/g per mrem/yr)

(dpm/100 cm2)/pCi/g = pCi/g in soil per dpm/100 cm2 in pipe The spreadsheet calculation of Buried Pipe DCGLs is shown in Attachment 9. Table 4 provides the resulting Buried Pipe DCGLs.

Table 4 - Buried Pipe DCGLs Buried Pipe DCGL Radionuclide (dpm/100 cm2)

Co-60 2.982E+04 Cs-134 5.214E+04 Cs-137 1.189E+05 Ni-63 8.708E+07 Sr-90 7.332E+04

4. Buried Pipe Elevated Measurement Criteria This section calculates values to be used in the unlikely event that concentrations are identified in buried pipe that exceed the DCGLs listed in Table 4. The calculated Buried Pipe DCGL Elevated Measurement Criteria (BPDCGLEMC) values are analogous to soil DCGLEMC values and would be assessed in the same manner as in the standard MARSSIM application of DCGLEMC in soil. One difference is that due to the excavation scenario used, as described below, a single BPDCGLEMC is calculated based on a pipe length of 20 m. For soil, the DCGLEMC could be a range of values depending on the size of the elevated area which could vary. The Elevated Measurement Comparison test to determine the dose impact for buried pipe would therefore be based the concentration average over a 20 m pipe length.

The Buried Pipe DCGLEMC values also serve to confirm that the DCGLs listed in Table 4 which are calculated under the assumption that all buried pipe on the Zion site is excavated, are conservative relative to the dose or concentration assuming a single pipe excavation scenario.

The guidance in NUREG-1757, Vol. 2, Rev. 1, Appendix J (4) was used to develop the BPDCGLEMC. As a conservative assumption and consistent with dose assessment for soil and backfilled basements, the resident farmer critical group was used for the assessment. The buried piping dose assessment includes three major steps:

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TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 Develop individual pipe excavation scenario.

Calculate the surface activity within the buried piping that corresponds to the soil DCGL assuming mixing in a volume of soil equal to the internal volume of the pipe.

Calculate the BPDCGLEMC 4.1. Individual Buried Pipe Excavation Scenario NUREG-1757 assumes a 10 m by 20 m (200 m2) house with a 3.0 m deep basement is excavated by the resident farmer (4). Figure 1 provides a visualization of the excavation scenario as modified from Figure J.3 in NUREG-1757 to apply to the buried piping geometry. Details as to how this general scenario is applied to the buried piping dose assessment are provided in the following sections.

Figure 1 - Buried Piping Excavation Scenario based on NUREG 1757, Vol. 2 Appendix J guidance.

To follow the guidance in NUREG-1757, Vol. 2, Rev 1, Appendix J, (4) inadvertent intrusion into the residual radioactivity within the buried piping by the resident farmer for house (or trench) construction would displace the soil and mix the volume of the contaminated soil (volume within buried piping) with the interspersing clean soil and spread the residual radioactivity from within the total excavated soil volume across the surface of the property (Figure 2). As per the NUREG-1757 guidance, this TSD assumes that the house will have a surface area of 200 square meters (m2) (10 x 20 m) to a depth of 3 m. A more conservative approach was applied to the buried piping EMC excavation scenario than recommended in NUREG-1757 , in that the clean excavated soil surrounding the pipe is not assumed to mix with the assumed volume of contaminated soil (equal to the internal volume of the pipe). Using the most conservative hypothetical example, the residual radioactivity within the pipe volume will be spread out evenly over the remaining property at a depth of approximately 0.15 m. This will be calculated for a 20 m length of pipe and the various buried pipe internal diameters associated with the ZSRP.

4.2. Buried Pipe Surface Activity Concentrations Corresponding to Soil DCGLs As an intermediate step in the calculation of buried piping DCGLs, the site-specific, surface DCGL values from Table 1 were used to calculate the internal piping surface activity levels (in Page 11 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 dpm/100 cm2) that would result in a concentration equal to the soil DCGL, assuming that the entire internal surface activity inventory is mixed with a volume of soil equal to the internal volume of the pipe. The calculations were performed on the full range of buried piping diameters and the five ROC; Cs-137, Co-60, Cs-134, Ni-63 and Sr-90 (TSD 14-010, (2)). The calculations assumed:

the length of the pipe is 20 m (longest section for 10 m x 20 m house footprint),

the contamination is assumed to be heterogeneously mixed within the soil volume of the pipe, the soil concentration within the pipe will be converted to a surface activity value using the internal surface of the various diameter buried piping, area factors will be calculated for the various internal diameter buried piping associated with ZSRP the contaminated soil within the pipe is spread evenly over the ground surface to a depth of 0.15 m and hence, the 0.15 m DCGLs from Table 1 was used.

Figure 2 represents an example of the assumed excavated buried piping scenario. For this example, the 0.15 m thickness DCGL for Cs-137 from Table 1 (15.8 pCi/g) is used. The calculated values for a 4-inch diameter pipe are demonstrated in the following equations:

Overburden layer of soil thickness (0.15 m) from buried piping excavation Clean Soil 1.0 m Buried Pipe 4 inch internal diameter 20 m Figure 2 - Buried Piping Excavation Calculation Example (1) Internal diameter of 4-inch pipe (d) = 4.026 inches = 10.23 cm = 0.1023 m (Attachment 2, Schedule 40 Pipe Dimensions), (5)

(2) Length of pipe (h) = 2000 cm = 20 m (3) Zion soil density = 1.8 g/cm3 = 1.8E+6 g/m3 (6)

(4) Volume of pipe = r2h = *(d/2)2*h = 0.1642 m3 = 1.64E+5 cm3 (5) Mass within pipe = Volume

  • Density = 2.96E+5 g (6) Concentration within pipe at DCGL for Cs-137 = 15.8 pCi/g
  • Mass in pipe = 4.67E+6 pCi (7) Convert concentration to dpm = 2.54E+6 pCi*2.22dpm/pCi = 1.04E+7 dpm (8) Surface Area within cylinder (not including the open ends) = 2rh = 2**(d/2)*h = 6.425 m2

= 6.425E+4 cm2 (9) Surface Activity = (Concentration in dpm/Surface Area in cm2)*100 (factor for 100 cm2 area) = 1.614E+04 dpm/100 cm2 (this value italicized below in Table 2)

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TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 A list of the surface activity levels within each of the pipe diameters is provided in Table 5. The assumption is made that the contamination within the pipe is at the surface DCGL for each of the ROC. The spreadsheet containing the calculations for each applicable diameter of pipe is provided as Attachment 3 - Buried Piping Surface Activity Calculations.

Table 5 - Summary of Surface Activity Levels for Buried Piping Corresponding to Surface Soil DCGL Concentrations Pipe Internal Cs-137 Co-60 Cs-134 Ni-63 Sr-90 Diameter (inches) dpm/100 cm2 dpm/100 cm2 dpm/100 cm2 dpm/100 cm2 dpm/100 cm2 1.0 4.21E+03 1.25E+03 1.30E+03 1.06E+06 3.83E+03 1.25 5.53E+03 1.65E+03 2.63E+03 1.40E+06 5.04E+03 1.5 6.45E+03 1.92E+03 3.06E+03 1.63E+06 5.88E+03 2.0 8.29E+03 2.47E+03 3.93E+03 2.10E+06 7.55E+03 2.5 9.90E+03 2.94E+03 4.70E+03 2.51E+06 9.02E+03 3.0 1.23E+04 3.66E+03 5.84E+03 3.11E+06 1.12E+04 3.5 1.42E+04 4.23E+03 6.75E+03 3.60E+06 1.30E+04 4.0 1.61E+04 4.80E+03 7.66E+03 4.09E+06 1.47E+04 5.0 2.02E+04 6.02E+03 9.60E+03 5.12E+06 1.84E+04 6.0 2.43E+04 7.23E+03 1.15E+04 6.16E+06 2.22E+04 8.0 3.20E+04 9.52E+03 1.52E+04 8.10E+06 2.92E+04 10.0 4.02E+04 1.19E+04 1.91E+04 1.02E+07 3.66E+04 12.0 4.79E+04 1.42E+04 2.27E+04 1.21E+07 4.36E+04 14.0 5.26E+04 1.57E+04 2.50E+04 1.33E+07 4.80E+04 16.0 6.01E+04 1.79E+04 2.85E+04 1.52E+07 5.48E+04 18.0 6.77E+04 2.01E+04 3.21E+04 1.71E+07 6.17E+04 20.0 7.54E+04 2.24E+04 3.58E+04 1.91E+07 6.87E+04 24.0 9.07E+04 2.70E+04 4.31E+04 2.30E+07 8.27E+04 32.0 1.23E+05 3.65E+04 5.83E+04 3.11E+07 1.12E+05 34.0 1.31E+05 3.89E+04 6.21E+04 3.31E+07 1.19E+05 36.0 1.38E+05 4.11E+04 6.57E+04 3.50E+07 1.26E+05 42.0 1.62E+05 4.83E+04 7.71E+04 4.11E+07 1.48E+05 Note: This table is a summary of the results from Attachment 3 - Buried Piping Surface Activity Calculations 4.2.1. Soil Area Factors for Buried Pipe Volumes at 20 m Length RESRAD was used to calculate generic Area Factors (AF) for surface soil at ZNPS. These Soil AFs are presented in Table 3 of TSD 14-011, (7) and are reproduced as Table 6 below.

Soil AFs specific to buried pipe volumes at 20 m lengths were calculated using the surface area of the excavated piping volume after spreading over a depth of 0.15 m. The soil AFs were determined for each pipe diameter by interpolation using the data in Table 6. A list of the soil AFs specific to buried piping is presented in Table 7. The calculations of the Table 7 values are provided in Page 13 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 Attachment 4. Using the 4-inch diameter buried pipe as the example, the soil AF for Cs-137 was calculated as follows:

(1) Volume of pipe = r2h = *(d/2)2*h = 0.1642 m3 (from Attachment 3, Buried Piping Surface Area Calculations)

(2) Divide the volume by the depth of the contamination to get the surface area =

0.1642 m3/0.15 m = 1.095 m2 Table 6 - Surface Soil Area Factors Area Factors for Radionuclides of Concern Area (m2)

Cs-137 Co-60 Cs-134 Ni-63 Sr-90 0.01 1.50E+03 1.23E+03 1.33E+03 3.31E+05 8.40E+04 0.03 4.98E+02 4.09E+02 4.42E+02 1.76E+05 3.03E+04 0.10 1.50E+02 1.23E+02 1.33E+02 6.92E+04 8.52E+03 0.30 4.98E+01 4.09E+01 4.42E+01 2.57E+04 2.88E+03 1 1.50E+01 1.23E+01 1.33E+01 8.06E+03 8.90E+02 3 6.46E+00 5.24E+00 5.73E+00 2.73E+03 3.13E+02 10 3.06E+00 2.47E+00 2.72E+00 8.23E+02 1.03E+02 30 2.10E+00 1.68E+00 1.86E+00 2.75E+02 4.02E+01 100 1.62E+00 1.29E+00 1.44E+00 8.26E+01 1.64E+01 300 1.46E+00 1.16E+00 1.30E+00 2.75E+01 6.14E+00 1,000 1.33E+00 1.08E+00 1.20E+00 8.26E+00 1.88E+00 3,000 1.26E+00 1.05E+00 1.16E+00 4.68E+00 1.72E+00 10,000 1.13E+00 1.02E+00 1.08E+00 1.86E+00 1.33E+00 64,500 1.00E+00 1.00E+00 1.00E+00 1.00E+00 1.00E+00 Note: From TSD 14-011 (3) Using the data within Table 6, the new soil AF for a 4-inch diameter pipe at the Cs-137 DCGL is calculated by interpolation to be 1.395E+01 (See Table 7, italicized). Refer to Attachment 4 for interpolation calculations example.

4.2.2. Calculation of BPDCGLEMC The BPDCGLEMC values for various pipe diameters can now be determined by multiplying the surface activity levels in Table 5 by the corresponding soil AF in Table 7. Again using the 4-inch pipe example, the Buried Pipe AF for a 20 meter length section of pipe is calculated as follows:

(1) Surface activity corresponding to the 0.15 m soil DCGL for Cs-137 for a 4-inch pipe =

1.61E+04 dpm/100 cm2 (from Table 5)

(2) Area Factor = 1.39E+01 (from Table 7)

(3) Buried Pipe AF = 1.614E+04 dpm/100 cm2

  • 1.39E+01 = 2.25E+05 dpm/100 cm2 (italicized in Table 8)

The BPDCGLEMC for various pipe diameters and each of the ROC are provided in Table 8. The spreadsheet for all the derived DCGL and AF calculations is provided as Attachment 5.

Page 14 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 Table 7 - Soil Area Factors for ROC Based on Pipe Diameters at 20 Meters Length Surface Area for Soil Pipe Cs-137 Co-60 Cs-134 Ni-63 Sr-90 Spread with Depth of Diameter Area Area Area Area Area 0.15 m (in) Factors Factors Factors Factors Factors (m2) 1.0 0.074 2.02E+02 1.66E+02 1.79E+02 8.74E+04 6.50E+03 1.25 0.129 1.16E+02 9.53E+01 1.03E+02 5.50E+04 6.63E+03 1.5 0.175 8.54E+01 7.02E+01 7.58E+01 4.18E+04 4.91E+03 2.0 0.289 5.17E+01 4.25E+01 4.59E+01 2.65E+04 2.99E+03 2.5 0.412 3.63E+01 2.98E+01 3.22E+01 1.89E+04 2.12E+03 3.0 0.636 2.35E+01 1.93E+01 2.09E+01 1.25E+04 1.38E+03 3.5 0.850 1.76E+01 1.45E+01 1.56E+01 9.42E+03 1.04E+03 4.0 1.095 1.39E+01 1.15E+01 1.24E+01 7.37E+03 8.16E+02 5.0 1.720 9.88E+00 8.07E+00 8.76E+00 4.72E+03 5.31E+02 6.0 2.484 7.46E+00 6.07E+00 6.62E+00 3.29E+03 3.74E+02 8.0 4.301 5.17E+00 4.18E+00 4.58E+00 1.91E+03 2.24E+02 10.0 6.780 3.89E+00 3.15E+00 3.46E+00 1.21E+03 1.47E+02 12.0 9.624 3.13E+00 2.53E+00 2.79E+00 8.55E+02 1.07E+02 14.0 11.631 2.91E+00 2.34E+00 2.58E+00 7.08E+02 9.04E+01 16.0 15.194 2.65E+00 2.13E+00 2.35E+00 5.42E+02 7.20E+01 18.0 19.232 2.45E+00 1.96E+00 2.17E+00 4.29E+02 5.88E+01 20.0 23.897 2.27E+00 1.82E+00 2.01E+00 3.45E+02 4.89E+01 24.0 34.563 2.04E+00 1.63E+00 1.80E+00 2.39E+02 3.62E+01 32.0 63.329 1.79E+00 1.43E+00 1.59E+00 1.30E+02 2.31E+01 34.0 71.870 1.74E+00 1.39E+00 1.54E+00 1.15E+02 2.10E+01 36.0 80.374 1.70E+00 1.35E+00 1.51E+00 1.03E+02 1.93E+01 42.0 110.761 1.58E+00 1.28E+00 1.43E+00 7.46E+01 1.50E+01 Note: Refer to Attachment 5 - Determination of Area Factors and DCGLs for Various Pipes at 20 m Length Page 15 of 58

TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1 Table 8 - Buried Piping DCGLEMC for Various Buried Pipe Diameters at 20 Meters Length Pipe Initial DCGLs (dpm/100 cm2)

Diameter (in)

Cs-137 Co-60 Cs-134 Ni-63 Sr-90 1.0 8.50E+05 2.08E+05 2.34E+05 9.29E+10 2.49E+07 1.25 6.41E+05 1.57E+05 2.70E+05 7.71E+10 3.34E+07 1.5 5.51E+05 1.35E+05 2.32E+05 6.83E+10 2.89E+07 2.0 4.29E+05 1.05E+05 1.81E+05 5.57E+10 2.26E+07 2.5 3.59E+05 8.77E+04 1.51E+05 4.74E+10 1.91E+07 3.0 2.89E+05 7.07E+04 1.22E+05 3.88E+10 1.55E+07 3.5 2.50E+05 8.18E+04 1.05E+05 3.39E+10 1.35E+07 4.0 2.25E+05 5.50E+04 9.48E+04 3.01E+10 1.20E+07 5.0 2.00E+05 4.86E+04 8.42E+04 2.42E+10 9.79E+06 6.0 1.81E+05 4.39E+04 7.64E+04 2.02E+10 8.29E+06 8.0 1.65E+05 3.98E+04 6.96E+04 1.54E+10 6.54E+06 10.0 1.56E+05 3.76E+04 6.60E+04 1.23E+10 5.39E+06 12.0 1.50E+05 3.60E+04 6.33E+04 1.04E+10 4.65E+06 14.0 1.53E+05 3.67E+04 6.45E+04 9.43E+09 4.34E+06 16.0 1.59E+05 3.82E+04 6.72E+04 8.26E+09 3.94E+06 18.0 1.65E+05 3.95E+04 6.97E+04 7.34E+09 3.63E+06 20.0 1.71E+05 4.08E+04 7.20E+04 6.59E+09 3.36E+06 24.0 1.85E+05 4.39E+04 7.77E+04 5.48E+09 2.99E+06 32.0 2.19E+05 5.21E+04 9.25E+04 4.05E+09 2.58E+06 34.0 2.28E+05 5.40E+04 9.59E+04 3.80E+09 2.51E+06 36.0 2.35E+05 5.57E+04 9.90E+04 3.60E+09 2.44E+06 42.0 2.57E+05 6.17E+04 1.10E+05 3.06E+09 2.22E+06 Note: Refer to Attachment 5 - Determination of Area Factors and DCGLs for Various Pipes at 20 m Length

5. CONCLUSION Buried Pipe DCGLs in units of dpm/100 cm2 were calculated for two scenarios; Excavation and Insitu. The calculation included all buried pipe on the Zion site. The DCGLs were conservatively based on the summation of dose from the Excavation and Insitu scenarios. Buried Pipe DCGLEMC values were also calculated to ensure that the dose from the excavation of individual pipe is bounded by the DCGL calculation and to provide values for use in an Elevated Measurement Comparison test in the unlikely event that areas are identified in the buried pipe that exceed the DCGLs.

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TSD 14-015 Buried Pipe Dose Modeling & DCGSs Revision 1

6. REFERENCES
1. 10 CFR 20 Standards for Protection Against Radiation, Subpart ERadiological Criteria for License Termination http://www.nrc.gov/reading-rm/doc-collections/cfr/part020/.
2. TSD 14-010, RESRAD Dose Assessment for Basement Fill Model Dose Factors and Soil DCGLs and Calculation of Basement Fill Model Dose Factors. Zion, Illinois : ZionSolutions, LLC, 2014.
3. TSD 14-019, Radionuclides of Concern for Basement Fill Model Source Term and Surrogate Ratios. Zion, Illinois : ZionSolutions, LLC, 2014.
4. NUREG-1757 Vol. 2, Rev. 1, Consolidated Decommissioning Guidance Characterization, Survey, and Determination of Radiological Criteria, September 2006.
5. flow/steel-pipe-schedule-40.htm, http://engineeringsedge.com/fluid. [Online]
6. Evaluation of Hydrological Parameters in Support of Dose Modeling for the Zion Restoration Project, Conestoga-Rovers & Associates, Chicago, IL,September 2014, Reference No.054638, Revision 5, Report No. 3.
7. TSD 14-011, Soil DCGLs and Area Factors. Zion : ZionSolutions, LLC, 2014.
7. ATTACHMENTS 7.1. Attachment 1 - Buried Piping Inventory 7.2. Attachment 2 - Schedule 40 Steel Pipe Sizes & Dimensions 7.3. Attachment 3 - Buried Piping Surface Activity Calculations 7.4. Attachment 4 - Determination of Area Factors for Specific Surface Areas 7.5. Attachment 5 - Determination of Area Factors and DCGLs for Various Diameter Pipes at 20 m Length 7.6. Attachment 6 - RESRAD Summary Report for ZSRP Buried Piping Excavation Scenario 7.7. Attachment 7 - RESRAD Summary Report for ZSRP Buried Piping Insitu Unsaturated Scenario 7.8. Attachment 8 - RESRAD Summary Report for ZSRP Buried Piping Insitu Saturated Scenario 7.9. Attachment 9 - Buried Pipe DCGL Calculation Page 17 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 1 - Buried Piping Inventory Revision 1 Buried Piping Inventory Surface Size Length Volume Elevation Survey Unit/Area Pipe Description Area Structure/Location Dwg. # Comments inches m feet m m2 m3 feet IRSF Area In-ground Pipes and Utilities 584', 22E 10202/12201 Embedded conduit 1 0.025 185 56.388 4.50 0.029 587'(TB) IRSF to TB 6506 follows mech. Piping to TB 584', 22E 10202/12201 Embedded conduit 3 0.076 185 56.388 13.49 0.257 587'(TB) IRSF to TB 6506 follows mech. Piping to TB 584', 22E 10202/12201 Embedded conduit 3 0.076 185 56.388 13.49 0.257 587'(TB) IRSF to TB 6506 follows mech. Piping to TB Tank Area In-ground Pipes and Utilities Lead clad 400MCM 22E 1 0.025 130 39.624 3.16 0.020 ~587' 12112 grounding cable Unit 1 CST 1006 Tank to Crib House ground Lead clad 400MCM 22E 1 0.025 130 39.624 3.16 0.020 ~587' 12103 grounding cable Unit 2 CST 1006 Tank to Crib House ground Lead clad 400MCM 22E 1 0.025 71 21.641 1.73 0.011 ~587' 12113 grounding cable Unit 1 PWST 1006 Tank to M.H. #1D Lead clad 400MCM 22E 1 0.025 71 21.641 1.73 0.011 ~587' 12103 grounding cable Unit 2 PWST 1006 Tank to M.H. #2D Lead clad 400MCM Fuel Oil Tank Berm 22E 1 0.025 125 38.100 3.04 0.019 ~587' 12203 grounding cable Sump 1006 Tank to M.H. #1D 22E 42 x 20 1.07 x 0.51 200 60.960 193.08 33.036 586' 12112 Cable duct package Unit 1 CST 1009 CST to C-35 22E 42 x 20 1.07 x 0.51 30 9.144 29.88 4.955 586' 12113 Cable duct package Unit 1 PWST 1009 PWST to M.H. #1D 22E 18 x 11.5 0.46 x 0.29 89 27.127 40.92 3.623 586' 12203 Cable duct package Fuel Oil Tank 1009 Fuel oil tank to M.H. # 1D 22E 42 x 20 1.07 x 0.51 200 60.960 193.08 33.036 586' 12103 Cable duct package Unit 2 CST 1009 CST to C-5 22E 42 x 20 1.07 x 0.51 30 9.144 29.88 4.955 586' 12103 Cable duct package Unit 2 PWST 1009 PWST to M.H. #2D Page 18 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 1 - Buried Piping Inventory Revision 1 Buried Piping Inventory Surface Survey Unit/Area Pipe Description Size Length Volume Elevation Area Structure/Location Dwg. # Comments inches m feet m m2 m 3 feet Crib House Area In-ground Pipes and Utilities M-100 /

Circulating water supply- 17 0.432 100 30.480 41.33 4.461 552' Crib House to Turbine M-105 / splits off to (2) 12' pipes feeding 12204 Unit 1 Building M-272 into turbine building after 100' M-100 /

Circulating water supply- 17 0.432 100 30.480 41.33 4.461 552' Crib House to Turbine M-105 / splits off to (2) 12' pipes feeding 12204 Unit 1 Building M-272 into turbine building after 100' Circ. Water supply drain - Drain located under circ water pipe 14 0.356 20 6.096 6.81 0.605 ~540' 12204 Unit 1 Crib House M-100 ~11' back from east end of 17' pipe Circ. Water supply drain - Drain located under circ water pipe 14 0.356 20 6.096 6.81 0.605 ~540' 12204 Unit 2 Crib House M-100 ~11' back from east end of 17' pipe Circ. Water inlet pipe Circ. Water inlet pipe to crib house 8 0.203 15 4.572 2.92 0.148 537' 12204 drain - Unit 1 Crib House B-478 west wall Circ. Water inlet pipe Circ. Water inlet pipe to crib house 8 0.203 15 4.572 2.92 0.148 537' 12204 drain - Unit 2 Crib House B-478 west wall Circ. Water discharge Circ. Water discharge tunnel to crib 8 0.203 142 43.282 27.62 1.403 537' 12204 tunnel drain - unit 1 Crib House B-478 house west wall Circ. Water discharge Circ. Water discharge tunnel to crib 8 0.203 142 43.282 27.62 1.403 537' 12204 tunnel drain - unit 2 Crib House B-478 house west wall Circ water intake to 16 0.406 150 45.720 58.34 5.928 558' 12204 forebay (X3) Crib House B-31 / B-7 connects to forebay from lake ice melting pipe to forebay B-31 / M- from discharge tunnel to forebay 144 3.658 65 19.812 227.65 208.166 558' 12204 - Unit 1 Forebay area 100 intake ice melting pipe to forebay B-31 / M- from discharge tunnel to forebay 144 3.658 65 19.812 227.65 208.166 558' 12204 - Unit 2 Forebay area 100 intake Ice melting pipe to B-31 / M- From 12' ice melt pipe to east side 96 2.438 20 6.096 46.70 28.467 558' 12204 forebay - Unit 1 Forebay area 100 of forebay Ice melting pipe to B-31 / M- From 12' ice melt pipe to east side 96 2.438 20 6.096 46.70 28.467 558' 12204 forebay - Unit 2 Forebay area 100 of forebay Page 19 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 1 - Buried Piping Inventory Revision 1 Buried Piping Inventory Surface Size Length Volume Elevation Survey Unit/Area Pipe Description Area Structure/Location Dwg. # Comments inches m feet m m2 m3 feet Aux Building Area In-ground Pipes and Utilities 12105/12106/12107/12 Service water to diesel M-102 goes into diesel gen bld on 12 0.305 45 13.716 13.13 1.000 554.75' 108 generator heat exchangers Auxiliary Building M-102 M-106 12105/12106/12107/12 Service water to diesel M-102 goes into diesel gen bld on 12 0.305 45 13.716 13.13 1.000 553.25' 108 generator heat exchangers Auxiliary Building M-102 M-106 12105/12106/12107/12 Service water to diesel M-102 goes into diesel gen bld on 12 0.305 45 13.716 13.13 1.000 554.75' 108 generator heat exchangers Auxiliary Building M-102 M-106 12105/12106/12107/12 Service water to diesel M-102 goes into diesel gen bld on 12 0.305 45 13.716 13.13 1.000 553.25' 108 generator heat exchangers Auxiliary Building M-102 M-106 12105/12106/12107/12 24 0.610 20 6.096 11.67 1.778 570' 108 Safety injection Auxiliary Building M-107 12105/12106/12107/12 M-107 section DD shows FB pen at 10 0.254 20 6.096 4.86 0.309 570' 108 Component cooling Auxiliary Building M-107 584' Page 20 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 1 - Buried Piping Inventory Revision 1 Buried Piping Inventory Surface Size Length Volume Elevation Survey Unit/Area Pipe Description Area Structure/Location Dwg. # Comments 2 3 inches m feet m m m feet 12105/12106/12107/12 M-107 section DD shows FB pen at 10 0.254 20 6.096 4.86 0.309 570' 108 Component cooling Auxiliary Building M-107 584' 12105/12106/12107/12 1.5 0.038 20 6.096 0.73 0.007 571' 108 Aerated drain Auxiliary Building M-107 12105/12106/12107/12 1.5 0.038 20 6.096 0.73 0.007 571' 108 Aerated drain Auxiliary Building M-107 12105/12106/12107/12 1.5 0.038 20 6.096 0.73 0.007 571' 108 Aerated drain Auxiliary Building M-107 12105/12106/12107/12 M-107 section DD shows FB pen at 2 0.051 20 6.096 0.97 0.012 570' 108 Service water Auxiliary Building M-107 584' 12105/12106/12107/12 M-107 section DD shows FB pen at 4 0.102 20 6.096 1.94 0.049 570' 108 Fire protection Auxiliary Building M-107 584' 12105/12106/12107/12 M-107 section DD shows FB pen at 1.5 0.038 20 6.096 0.73 0.007 570' 108 Instrument air Auxiliary Building M-107 584' 12105/12106/12107/12 M-107 section DD shows FB pen at 4 0.102 20 6.096 1.94 0.049 569.33' 108 Aerated drain Auxiliary Building M-107 583' 12105/12106/12107/12 M-107 section DD shows FB pen at 1.5 0.038 20 6.096 0.73 0.007 569.33' 108 Service air Auxiliary Building M-107 583' 12105/12106/12107/12 M-107 section DD shows FB pen at 3 0.076 20 6.096 1.46 0.028 569.33' 108 Spent fuel pit cooling Auxiliary Building M-107 583' 12105/12106/12107/12 M-107 section DD shows FB pen at 2 0.051 20 6.096 0.97 0.012 569.33' 108 Spent fuel pit cooling Auxiliary Building M-107 583' 12105/12106/12107/12 24 0.610 20 6.096 11.67 1.778 570' 108 Safety injection Auxiliary Building M-107 12105/12106/12107/12 M-107 section CC shows FB pen at 10 0.254 20 6.096 4.86 0.309 570' 108 Component cooling Auxiliary Building M-107 584' 12105/12106/12107/12 M-107 section CC shows FB pen at 10 0.254 20 6.096 4.86 0.309 570' 108 Component cooling Auxiliary Building M-107 584' 12105/12106/12107/12 1.5 0.038 20 6.096 0.73 0.007 571' 108 Aerated drain Auxiliary Building M-107 Page 21 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 1 - Buried Piping Inventory Revision 1 Buried Piping Inventory Surface Size Length Volume Elevation Survey Unit/Area Pipe Description Area Structure/Location Dwg. # Comments inches m feet m m2 m 3 feet Aux Building Area In-ground Pipes and Utilities 12105/12106/12107/121 1.5 0.038 20 6.096 0.73 0.007 571' 08 Aerated drain Auxiliary Building M-107 12105/12106/12107/121 1.5 0.038 20 6.096 0.73 0.007 571' 08 Aerated drain Auxiliary Building M-107 12105/12106/12107/121 M-107 section CC shows FB pen at 2.5 0.064 20 6.096 1.22 0.019 570' 08 Waste disposal Auxiliary Building M-107 584' 12105/12106/12107/121 3 0.076 20 6.096 1.46 0.028 570' 08 Demineralized water Auxiliary Building M-107 12105/12106/12107/121 M-107 section CC shows FB pen at 4 0.102 20 6.096 1.94 0.049 569' 08 Aerated drain Auxiliary Building M-107 584' 12105/12106/12107/121 M-107 section CC shows FB pen at 2 0.051 20 6.096 0.97 0.012 569' 08 Service water Auxiliary Building M-107 584' 12105/12106/12107/121 M-107 section CC shows FB pen at 3 0.076 20 6.096 1.46 0.028 569' 08 Spent fuel pit cooling Auxiliary Building M-107 583' 12105/12106/12107/121 M-107 section CC shows FB pen at 3 0.076 20 6.096 1.46 0.028 569' 08 Spent fuel pit cooling Auxiliary Building M-107 583' 12105/12106/12107/121 M-107 section CC shows FB pen at 2 0.051 20 6.096 0.97 0.012 569' 08 Spent fuel pit cooling Auxiliary Building M-107 583' 12105/12106/12107/121 M-107 section CC shows FB pen at 1.5 0.038 20 6.096 0.73 0.007 569' 08 Service air Auxiliary Building M-107 583' 12105/12106/12107/121 M-107 section CC shows FB pen at 3 0.076 20 6.096 1.46 0.028 569' 08 Demineralized water Auxiliary Building M-107 583' 12105/12106/12107/121 M-107 section CC shows FB pen at 3 0.076 20 6.096 1.46 0.028 569' 08 Waste drain? Auxiliary Building M-107 583' 12105/12106/12107/121 24 0.610 20 6.096 11.67 1.778 570' 08 Demineralized water Auxiliary Building M-162 12105/12106/12107/121 4 0.102 20 6.096 1.94 0.049 570' 08 Feedwater Auxiliary Building M-162 12105/12106/12107/121 4 0.102 20 06.096 1.94 0.049 550' 08 Line with flange Auxiliary Building  ?

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TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 1 - Buried Piping Inventory Revision 1 Buried Piping Inventory Surface Size Length Volume Elevation Survey Unit/Area Pipe Description Area Structure/Location Dwg. # Comments inches m feet m m2 m 3 feet Waste Water Treatment Facility Area In-ground Pipes and Utilities 12102 Force Main 8 0.203 80 24.384 15.56 0.790 586'-587' WWTF B-1003 from MH #3 to equalization tank drops down to 578' at eq, tank 12102 Sludge drying bed drain 6 0.152 47 14.326 6.86 0.261 588' WWTF B-1003 sump Fire sump discharge line 12102 & heater bay roof drain 6 0.152 53 16.154 7.73 0.295 578' WWTF B-1003 Runs to equalization tank & sump lines at 575' Forebay Area In-ground Pipes and Utilities WWTF discharge to 12204 8 0.203 342 104.242 66.51 3.379 586'9' forebay WWTF to forebay B-1005 WWTF north wall to north 12204 Ice melting pipe - Unit 1 96 2.438 25 7.620 4.86 35.584 569' Forebay M-100 Discharge tunnel to forebay 12204 Ice melting pipe - Unit 1 144 3.658 71 21.589 20.66 227.381 569' Forebay M-100 Discharge tunnel to after bay 12204 Ice melting pipe - Unit 2 96 2.438 25 7.620 4.86 35.584 569' Forebay M-100 Discharge tunnel to forebay 12204 Ice melting pipe - Unit 2 144 3.658 71 21.589 20.66 227.381 569' Forebay M-100 Discharge tunnel to after bay Fuel Building Area In-ground Pipes and Utilities 12107 1CC080 - Unit 1 10 0.254 4 1.219 0.97 0.062 570' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1CC078 - Unit 1 10 0.254 4 1.219 0.97 0.062 570' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1AD148 - Unit 1 1.5 0.038 4 1.219 0.15 0.001 572' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1AD147 - Unit 1 1.5 0.038 4 1.219 0.15 0.001 572' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1AD149 - Unit 1 1.5 0.038 4 1.219 0.15 0.001 572' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1SI012 - Unit 1 24 0.610 4 1.219 2.33 0.356 569' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 0DL100 - Unit 1 2 0.051 4 1.219 0.19 0.002 569' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1SF022 - Unit 1 3 0.076 4 1.219 0.29 0.006 569' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1SF008 - Unit 1 2 0.051 4 1.219 0.19 0.002 569' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 0FP016 - Unit 1 4 0.102 4 1.219 0.39 0.010 570' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1SW181 - Unit 1 2 0.051 4 1.219 0.19 0.002 570' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 0IA004 - Unit 1 1.5 0.038 4 1.219 0.15 0.001 570' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1AD146 - Unit 1 4 0.102 4 1.219 0.39 0.010 569' Fuel Building M-107 Fuel building to unit 1 CTMT 12107 1SA014 - Unit 1 1.5 0.038 4 1.219 0.15 0.001 569' Fuel Building M-107 Fuel building to unit 1 CTMT 12106 2CC080 - Unit 2 10 0.254 4 1.219 0.97 0.062 570' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2CC078 - Unit 2 10 0.254 4 1.219 0.97 0.062 570' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2AD148 - Unit 2 1.5 0.038 4 1.219 0.15 0.001 572' Fuel Building M-107 Fuel building to unit 2 CTMT Page 23 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 1 - Buried Piping Inventory Revision 1 Buried Piping Inventory Surface Size Length Volume Elevation Survey Unit/Area Pipe Description Area Structure/Location Dwg. # Comments inches m feet m m2 m 3 feet 12106 2AD147 - Unit 2 1.5 0.038 4 1.219 0.15 0.001 572' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2SI012 - Unit 2 24 0.610 4 1.219 2.33 0.356 570' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 0SF012 - Unit 2 3 0.076 4 1.219 0.29 0.006 569' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2SF022 - Unit 2 3 0.076 4 1.219 0.29 0.006 569' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2SF008 - Unit 2 2 0.051 4 1.219 0.19 0.002 569' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 0WD059 - Unit 2 2.5 0.064 4 1.219 0.24 0.004 570' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2DW014 - Unit 2 3 0.076 4 1.219 0.29 0.006 570' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2AD146 - Unit 2 4 0.102 4 1.219 0.39 0.010 570' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2SW243 - Unit 2 3 0.076 4 1.219 0.29 0.006 570' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2SA012 - Unit 2 1.5 0.038 4 1.219 0.15 0.001 569' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 2DW008 - Unit 2 3 0.076 4 1.219 0.29 0.006 569' Fuel Building M-107 Fuel building to unit 2 CTMT 12106 0CT061 - Unit 2 2 0.051 4 1.219 0.19 0.002 569' Fuel Building M-107 Fuel building to unit 2 CTMT m2 Total 2153 Note: If additional piping, not included in this inventory is discovered, this inventory will be updated and the new information evaluated and necessary adjustments will be performed.

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Attachment 2 - Schedule 40 Steel Pipe Sizes & TSD-14-015 Buried Pipe Dose Modeling & DCGLs Dimensions Revision 1 Schedule 40 Steel Pipe Sizes & Dimensions ASME/ANSI B36.10/19 Diameter (Inches) Wall (inches)

Inches Inside Diameter Outside Diameter Thickness 1.0 1.049 1.315 0.133 1.25 1.38 1.66 0.14 1.5 1.61 1.9 0.145 2.0 2.067 2.375 0.154 2.5 2.469 2.875 0.203 3.0 3.068 3.5 0.216 3.5 3.548 4 0.226 4.0 4.026 4.5 0.237 5.0 5.047 5.563 0.258 6.0 6.065 6.625 0.28 8.0 7.981 8.625 0.322 10.0 10.02 10.75 0.365 12.0 11.938 12.75 0.406 14.0 13.124 14 0.438 16.0 15 16 0.5 18.0 16.876 18 0.562 20.0 18.812 20 0.594 24.0 22.624 24 0.688 32.0 30.624 32 0.688 34.0 32.624 34 0.688 36.0 34.5 36 0.75 42.0 40.5 42 0.75 Data from:

http://engineersedge.com/fluid_flow/steel-pipe-schedule-40.htm Page 25 of 58

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TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 33 of 58

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TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 35 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 36 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 37 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 38 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 39 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 40 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 41 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 42 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 43 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 44 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 45 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 Page 46 of 58

TSD-14-015 Buried Pipe Dose Modeling & DCGLs Attachment 3 - Buried Piping Surface Activity Calculations Revision 1 NOTE: The summary of these results is provided in Table 3: Summary of Surface Activity Levels for Buried Piping with Various Internal Diameters Page 47 of 58

Attachment 4 - Determination of Area Factors for TSD-14-015 Buried Pipe Dose Modeling & DCGLs Specific Surface Areas Revision 1 Page 48 of 58

Attachment 4 - Determination of Area Factors for TSD-14-015 Buried Pipe Dose Modeling & DCGLs Specific Surface Areas Revision 1 Page 49 of 58

Attachment 4 - Determination of Area Factors for TSD-14-015 Buried Pipe Dose Modeling & DCGLs Specific Surface Areas Revision 1 Page 50 of 58

Attachment 4 - Determination of Area Factors for TSD-14-015 Buried Pipe Dose Modeling & DCGLs Specific Surface Areas Revision 1 Page 51 of 58

Attachment 4 - Determination of Area Factors for TSD-14-015 Buried Pipe Dose Modeling & DCGLs Specific Surface Areas Revision 1 Note: This is a compilation of data from Attachments 2 and 3 and Tables 2 through 5.

Page 52 of 58

Attachment 5 - Determination of BPDCGLEMC for Various TSD 14-015 Buried Pipe Dose Modeling & DCGLs Diameter Pipes at 20 Meters Length Revision 1 Determination of Buried Pipe Area Factors for Various Diameter Pipes at 20 Meters Length Surface Area Pipe Inside Inside Pipe Pipe for Soil Cs-137 Co-60 Cs-134 Ni-63 Buried Pipe DCGLEMC (dpm/100 cm2)

Sr-90 Area Diameter Diameter Diameter Surface Volume Spread with Area Area Area Area Factors (in) (in) (cm) Area (m2) (m3) Depth of Factor Factors Factors Factors

.15m (m2) Cs-137 Co-60 Cs-134 Ni-63 Sr-90 1.0 1.049 2.664 1.673 0.0111 0.074 2.02E+02 1.66E+02 1.79E+02 8.74E+04 6.50E+03 8.50E+05 2.08E+05 2.34E+05 9.29E+10 2.49E+07 1.25 1.380 3.505 2.201 0.0193 0.129 1.16E+02 9.53E+01 1.03E+02 5.50E+04 6.63E+03 6.41E+05 1.57E+05 2.70E+05 7.71E+10 3.34E+07 1.5 1.610 4.089 2.568 0.0263 0.175 8.54E+01 7.02E+01 7.58E+01 4.18E+04 4.91E+03 5.51E+05 1.35E+05 2.32E+05 6.83E+10 2.89E+07 2.0 2.067 5.250 3.297 0.0433 0.289 5.17E+01 4.25E+01 4.59E+01 2.65E+04 2.99E+03 4.29E+05 1.05E+05 1.81E+05 5.57E+10 2.26E+07 2.5 2.469 6.271 3.938 0.0617 0.412 3.63E+01 2.98E+01 3.22E+01 1.89E+04 2.12E+03 3.59E+05 8.77E+04 1.51E+05 4.74E+10 1.91E+07 3.0 3.068 7.793 4.894 0.0953 0.636 2.35E+01 1.93E+01 2.09E+01 1.25E+04 1.38E+03 2.89E+05 7.07E+04 1.22E+05 3.88E+10 1.55E+07 3.5 3.548 9.012 5.659 0.1275 0.850 1.76E+01 1.45E+01 1.56E+01 9.42E+03 1.04E+03 2.50E+05 8.18E+04 1.05E+05 3.39E+10 1.35E+07 4.0 4.026 10.226 6.422 0.1642 1.095 1.39E+01 1.15E+01 1.24E+01 7.37E+03 8.16E+02 2.25E+05 5.50E+04 9.48E+04 3.01E+10 1.20E+07 5.0 5.047 12.819 8.051 0.2580 1.720 9.88E+00 8.07E+00 8.76E+00 4.72E+03 5.31E+02 2.00E+05 4.86E+04 8.42E+04 2.42E+10 9.79E+06 6.0 6.065 15.405 9.674 0.3726 2.484 7.46E+00 6.07E+00 6.62E+00 3.29E+03 3.74E+02 1.81E+05 4.39E+04 7.64E+04 2.02E+10 8.29E+06 8.0 7.981 20.272 12.731 0.6452 4.301 5.17E+00 4.18E+00 4.58E+00 1.91E+03 2.24E+02 1.65E+05 3.98E+04 6.96E+04 1.54E+10 6.54E+06 10.0 10.020 25.451 15.983 1.0170 6.780 3.89E+00 3.15E+00 3.46E+00 1.21E+03 1.47E+02 1.56E+05 3.76E+04 6.60E+04 1.23E+10 5.39E+06 12.0 11.938 30.323 19.043 1.4435 9.624 3.13E+00 2.53E+00 2.79E+00 8.55E+02 1.07E+02 1.50E+05 3.60E+04 6.33E+04 1.04E+10 4.65E+06 14.0 13.124 33.335 20.934 1.7446 11.631 2.91E+00 2.34E+00 2.58E+00 7.08E+02 9.04E+01 1.53E+05 3.67E+04 6.45E+04 9.43E+09 4.34E+06 16.0 15.000 38.100 23.927 2.2790 15.194 2.65E+00 2.13E+00 2.35E+00 5.42E+02 7.20E+01 1.59E+05 3.82E+04 6.72E+04 8.26E+09 3.94E+06 18.0 16.876 42.865 26.919 2.8847 19.232 2.45E+00 1.96E+00 2.17E+00 4.29E+02 5.88E+01 1.65E+05 3.95E+04 6.97E+04 7.34E+09 3.63E+06 20.0 18.812 47.782 30.007 3.5846 23.897 2.27E+00 1.82E+00 2.01E+00 3.45E+02 4.89E+01 1.71E+05 4.08E+04 7.20E+04 6.59E+09 3.36E+06 24.0 22.624 57.465 36.088 5.1845 34.563 2.04E+00 1.63E+00 1.80E+00 2.39E+02 3.62E+01 1.85E+05 4.39E+04 7.77E+04 5.48E+09 2.99E+06 32.0 30.624 77.785 48.849 9.4993 63.329 1.79E+00 1.43E+00 1.59E+00 1.30E+02 2.31E+01 2.19E+05 5.21E+04 9.25E+04 4.05E+09 2.58E+06 34.0 32.624 82.865 52.039 10.7806 71.870 1.74E+00 1.39E+00 1.54E+00 1.15E+02 2.10E+01 2.28E+05 5.40E+04 9.59E+04 3.80E+09 2.51E+06 36.0 34.500 87.630 55.032 12.0561 80.374 1.70E+00 1.35E+00 1.51E+00 1.03E+02 1.93E+01 2.35E+05 5.57E+04 9.90E+04 3.60E+09 2.44E+06 42.0 40.500 102.870 64.602 16.6141 110.761 1.58E+00 1.28E+00 1.43E+00 7.46E+01 1.50E+01 2.57E+05 6.17E+04 1.10E+05 3.06E+09 2.22E+06 Page 53 of 58

Attachment 6 - Buried Pipe RESRAD Summary TSD-14-015 Buried Pipe Dose Modeling & DCGLs Reports for Excavation Scenario Revision 1 Page 54 of 58

Attachment 7 - Buried Pipe RESRAD Summary TSD-14-015 Buried Pipe Dose Modeling & DCGLs Reports for Insitu Unsaturated Scenario Revision 1 Page 55 of 58

Attachment 8 - Buried Pipe RESRAD Summary TSD-14-015 Buried Pipe Dose Modeling & DCGLs Reports for Insitu Saturated Scenario Revision 1 Page 56 of 58

Attachment 9 - Buried Pipe DCGL Calculation TSD-14-015 Buried Pipe Dose Modeling & DCGLs Revision 1 Calculation of Buried Pipe DCGL Assumptions Total Buried Pipe Internal Surface Area 2153 m2 Soil Mixing After Release from Pipe 0.15 m RESRAD Parameters All parameters same as for surface soil DCGL with following exceptions Area of Contaminated Zone 2153 m2 Contaminated Zone Thickness Insitu 0.15 m Length Parallel to Flow 46 m2 Cover Depth Insitu Unsat Zone 1 m Unsaturated Zone Thickness Insitu Unsat Zone 2.45 m Cover Depth Insitu Sat Zone 3.6 m Unsaturated Zone Thickness Insitu Sat Zone NA Cover Depth Excavation 0 m Contaminated Zone Thickness Excavation 0.15 Unsaturated Zone Thickness Excavation 3.45 m Conversion of dpm/100 cm2 to pCi/g after mixing with 15 cm depth of soil 1 dpm/100 cm2 2.2 dpm/pCi 0.4545455 pCi/100 cm2 on pipe surface at 1 dpm/100 cm2 0.0045455 pCi/cm2 on pipe surface at 1 dpm/100 cm2 1.8 g/cm3 soil density 15 cm mixing depth in soil 0.0001684 pCi/g in soil per dpm/100 cm2 in pipe Page 57 of 58

Attachment 9 - Buried Pipe DCGL Calculation TSD-14-015 Buried Pipe Dose Modeling & DCGLs Revision 1 Buried Pipe DCGL Including All Pipe and Summation of Insitu and Excavation Scenario Dose Excavation Insitu Insitu Buried Pipe Excavation + Max Unsaturated Saturated mrem/yr @ DCGL (mrem/yr Insitu (mrem/yr per (mrem/yr per 1 dpm/100 cm2 (dpm/100 per pCi/g) (mrem/yr pCi/g) pCi/g) cm2) per pCi/g)

Co-60 4.942E+00 3.790E-02 5.289E-04 4.980E+00 8.384E-04 2.982E+04 Cs-134 2.787E+00 6.115E-02 2.654E-03 2.848E+00 4.795E-04 5.214E+04 Cs-137 1.200E+00 4.854E-02 2.107E-03 1.249E+00 2.102E-04 1.189E+05 Ni-63 9.311E-04 7.743E-04 2.519E-04 1.705E-03 2.871E-07 8.708E+07 Sr-90 6.465E-01 6.366E-01 1.379E+00 2.026E+00 3.410E-04 7.332E+04 Page 58 of 58

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