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TSD-11-001, Revision 1, Potential Radionuclides of Concern During the Decommissioning of Zion Station
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Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page i of ii Table of Contents Section Page 1.0 PURPOSE............................................................................................................................1 2.0 DISCUSSION......................................................................................................................1 3.0 INDUSTRY GUIDANCE...................................................................................................2 4.0 REPRESENTATIVE SAMPLES........................................................................................4 5.0 INITIAL SUITE OF POTENTIAL RADIONUCLIDES....................................................7

6.0 REFERENCES

....................................................................................................................9 7.0 ATTACHMENTS..............................................................................................................10 7.1 Summary of Sample Analysis Results...................................................................10 7.2 Detected Radionuclides.........................................................................................10 7.3 Evaluation of Theoretical Neutron Acticivation Products Realative to Co-60 and Ni-63......................................................................................................................10 Tables Table 3-1 Potential Activation Products..................................................................................2 Table 3-2 Additional Fission and Activation Products Based on Actual Analysis Results.....4 Table 3-3 Additional Fission and Activation Products Based on Theoretical Considerations......................................................................................4 Table 4-1 Summary of Samples Analyzed...............................................................................5 Table 4-2 Radionuclides Relative Fractions Equal To, or Greater Than, 0.0001....................6 Table 5-1 Potential Radionuclides...........................................................................................7 Table 5-2 Initial Suite of Potential Radionuclides for the Decommissioning of the Zion Station..............................................................................................................9

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page ii of ii ACRONYMS AND ABBREVIATIONS BWR Boiling water reactor Ci/g Curies per gram MDA Minimum detectable activity MWe Megawatts electric NRC United States Nuclear Regulatory Commission PWR Pressurized water reactor

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 1 of 10 1.0 PURPOSE The purpose of this Technical Basis Document is to document an initial suite of potential radionuclides of concern for the decommissioning of the Zion Station. Industry guidance is reviewed as are the analysis results associated with representative samples associated with various site activities. The initial suite of potential radionuclides will be used to help define sample analysis requirements associated with decommissioning activities including characterization activities and license termination plan development. It is expected that as additional samples are collected and analyzed that this initial suite of radionuclides will be updated and will eventually represent those long lived radionuclides with a potential to be present at the time of final status survey.

2.0 DISCUSSION The Zion Nuclear Station is located in Northeast Illinois, on the western shore of Lake Michigan approximately half way between Milwaukee, Wisconsin and Chicago, Illinois.

Zion Station consists of two pressurized water reactors supplied by Westinghouse. Each reactor was rated at 1,085 Megawatts electric (MWe). On January 15, 1998 it was announced that the Zion Station had been permanently shut down. On March 9, 1998 certification was provided to the United State Nuclear Regulatory Commission (NRC) that all fuel assemblies had been permanently removed from both reactor vessels. As a result the 10 CFR 50 license for the Zion Station was revised to no longer authorize reactor operation or the placement of fuel within the reactor vessels. The Zion Station has been maintained in a SAFSTOR condition while waiting decommissioning and the termination of its license. On September 1, 2010 Zion Station's license was transferred to ZionSolutions, LLC a subsidiary of EnergySolutions in order to proceed with decommissioning activities and ultimate license termination.

As Decommissioning activities commence, numerous samples will be collected requiring radiological analysis. These radiological analyses may support operational health physics concerns; free release surveys, characterizations of equipment, buildings, and the environment; and planning activities associated with the development of a license termination plan. This initial suite of potential radionuclides will help guide the required analyses of these samples. As the decommissioning progresses additional samples will be collected and analyzed allowing for the initial suite of radionuclides to be updated. Some radionuclides may prove not to have been present, some radionuclides may be removed with the removal of a specific source term, some radionuclides may continue to decay to insignificant activity concentrations, and some radionuclides may be eliminated due to insignificant dose contributions. Eventually an updated suite of radionuclides representative of radionuclides with a potential to be present at the time of final status survey will be prepared. The ultimate goal being to establish a concise list, or lists, of radionuclides present in the various media subject to final status survey.

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 2 of 10 3.0 INDUSTRY GUIDANCE To aid in the development of an initial suite of potential radionuclides of concern for the decommissioning of the Zion Station several Industry Guidance documents were reviewed to generate a list of potential radionuclides. These guidance documents included NUREG/CR-3474, NUREG/CR-4289 and WINCO-1191. Radionuclide half lifes were obtained from ICRP Publication 38.

NUREG/CR-3474, Reference 6.1, provides tables of theoretical activation products for both pressurized water reactors (PWR) and boiling water reactors (BWR) based on typical materials of construction, anticipated impurities, assumed neutron flux, etc. Four tables from NUREG/CR-3474 were reviewed in order to prepare a list of potential radionuclides with half lives of two years or greater. These tables were:

Table 5.1-Activation of PWR Internals (Ci/gm), Type 305L Stainless Steel, 30 EFPY at Core Axial Midplane Table 5.3-Activation of Pressure Vessel Walls (Ci/gm), 30 EFPY at Core Axial Midplane Table 5.4-Activation of PWR Bioshield (Ci/gm), Average Concrete, 30 EFPY at Core Axial Midplane Table 5.6-Activation of PWR Bioshield (Ci/gm), Average Rebar, 30 EFPY at Core Axial Midplane Based on a review of these four tables from NUREG/CR-3474, Table 3-1 was prepared listing the potential radionuclides due to neutron activation of reactor components.

Table 3-1 Potential Activation Products Radionuclide Half Life (years)

H-3 1.24E1 C-14 5.73E3 CI-36 3.01E5 Ar-39 2.69E2 Ca-41 1.40E5 Mn-53 3.70E6 Fe-55 2.70E0 Ni-59 7.50E4 Co-60 5.27E0 Ni-63 9.60E1 Se-79 6.50E4 Kr-81 2.10E5 Kr-85 1.07E1

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 3 of 10 Radionuclide Half Life (years)

Sr-90 2.91E1 Nb-92m 2.70E7 Zr-93 1.53E6 Mo-93 3.50E3 Nb-94 2.03E4 Tc-99 2.13E5 Ag-108m 1.27E2 Sn-121m 5.50E1 I-129 1.57E7 Ba-133 1.07E1 Cs-134 2.06E0 Cs-137 3.00E1 Pm-145 1.77E1 Sm-146 1.03E8 Sm-151 9.00E1 Eu-152 1.33E1 Eu-154 8.80E0 Eu-155 4.96E0 Tb-158 1.50E2 Ho-166m 1.20E3 Hf-178m 3.10E1 Pb-205 1.43E7 U-233 1.58E5 Pu-239/240 2.41E4 NUREG/CR-4289, Reference 6.2 provides tables of actual sample analysis results obtained from seven nuclear power plants, both PWRs and BWRs, and include both fission and activation products. Four tables from NUREG/CR-4289 were reviewed in order to supplement the list of radionuclides with half lives greater than two years presented in Table 3-1. These tables were:

Table 4.1-Long-lived Residual Radionuclide Compositions in Total Plant Inventories at Seven Nuclear Generating Stations.

Table 4.2-Concentration Ranges of Radionuclides in Corrosion Films on Piping Exposed to Primary Reactor Coolant.

Table 4.3-Concentration Ranges of Radionuclides in Corrosion Films Internally Deposited in Piping and Hardware Exposed to Liquid Radwastes and Secondary Coolant.

Table 4.4-Concentration Ranges of Radionuclides Associated with Concrete from Highly Contaminated Areas Within Selected Nuclear Generating Stations.

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 4 of 10 Based on a review of these four tables from NUREG/CR-4289, Table 3-2 was prepared listing potential radionuclides with half lives of two years or greater that were not included in Table 3-1.

Table 3-2 Additional Fission and Activation Products Based on Actual Analysis Results Radionuclide Half Life (years)

Pu-238 8.77E1 Np-237 2.14E6 Am-241 4.32E2 Am-243 7.38E3 Cm-244 1.81E1 WINCO-1191, Reference 6.3, presents a theoretical listing of radionuclides expected to be found in both PWRs and BWRs and includes both fission and activation products. Of particular interest is Table 1 entitled Radionuclides Found in Nuclear Power Reactors (limited to half-lives longer than 50 days). Table 1 from WINCO-1191 was reviewed in order to supplement the lists of radionuclides with half lives greater than two years presented in Tables 3-1 and 3-2.

Based on a review of Table 1 from WINCO-1191, Table 3-3 was prepared listing potential radionuclides with half lives of two years or greater that were not included in Table 3-1 or Table 3-2.

Table 3-3 Additional Fission and Activation Products Based on Theoretical Considerations Radionuclide Half Life (years)

Sb-125 2.77E0 Pm-147 2.62E0 Pu-241 1.44E1 4.0 REPRESENTATIVE SAMPLES To further aid in the development of an initial suite of potential radionuclides of concern for the decommissioning of the Zion Station the analytical results of representative samples collected at the Zion Site were reviewed. A total of 19 sample analysis results were reviewed. In general the samples associated with these results were collected from within various waste/process streams and sent off site for a Part 61 analysis. All of the samples reviewed in preparing this Technical Basis Document were collected following the January 15, 1998 announcement that the Zion Station had been permanently shut down.

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 5 of 10 Table 4-1 provides a summary of the 19 samples.

Table 4-1 Summary of Samples Analyzed Sample Number/Identifier Date Collected Media Description 7695 4/3/1998 Resin Resin - Spent Resin Storage Tank 617 Level - Aux Building 7696 5/7/1998 Resin Resin - Number 1 Condensate Demin 592 Level - Aux Building 7699 5/7/1998 Resin Resin - Boric Acid Feed Demin 592 Level - Aux Building 9974 12/3/1998 Resin Resin - Number 2 Portable Demin Radwaste - 592 Level - Aux Building 9977 12/3/1998 Resin Resin - Number 3 Portable Demin Radwaste - 592 Level -Aux Building 25822 11/10/1999 Resin Resin - 2A Boric Acid Feed System 592 Level - Aux Building 25824 11/10/1999 Resin Resin - Number 2 Condensate Demin 592 Level - Aux Building 9870/18 11/22/1999 Smear Smears - DAW 25826 12/14/1999 Smear Smears - Chem Drain Tank Room 560 Level - Aux Building North 25825 1/3/2000 Sludge Sludge - Aux Building Sump Sludge 542 Level - Aux Building 9606 10/4/2000 Smear Smears - Portable Demin and Rad Waste Annex 592 Level - Aux Building 4130 12/1/2001 Smear Smear - Agua Flex Equipment 8986 1/5/2005 Smear Smear - U1 Let Down Heat Exchanger 592 Level - Aux Building South 4703 1/6/2006 Smear Smear - U1 Let Down Heat Exchanger 592 Level - Aux Building South 4630 8/14/2007 Smear Smear - Spent Fuel Storage Tank Room 617 Level - Aux Building South 4851 8/30/2007 Resin Resin - Spent Resin Storage Tank 7991 2/28/2008 Smear Smear - DAW Box DAW Building 7994 3/7/2008 Smear Smears - Aux Building Equipment Drain Analysis Tank 560 Level - Aux Building North 7993 3/7/2008 Smear Smear - Number 1 Let Down Heat Exchanger 592 Level - Aux Building

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 6 of 10.1 contains a summary of each of the analysis results for the 19 samples.

The data summarized in Attachment 7.1 shows the radionuclides analyzed for, the half life of each of the radionuclides analyzed for, the activity concentration of each radionuclide detected, the uncertainty in the activity concentration of each radionuclide detected, and the minimum detectable activity (MDA) concentration of each radionuclide analyzed for but not detected. In reviewing which of the radionuclides analyzed for were detected, the MDA of the radionuclides not detected must be considered.

.2 contains a summary of the radionuclides in each of the 19 samples that were detected. The radionuclide activity concentrations for each of the radionuclides detected were decay corrected to January 1, 2011. Based on the decay corrected activity concentrations the relative fraction represented by each radionuclide is provided.

Based on the data contained in Attachment 7.2 a list of radionuclides with relative fractions equal to, or greater than, 0.0001 (0.01%) was generated regardless of which of the 19 samples it was detected in. Table 4-2 lists those radionuclides that were detected and had a relative fraction equal to, or greater than, 0.0001.

Table 4-2 Radionuclides Relative Fractions Equal To, or Greater Than, 0.0001 Radionuclide Half Life (years)

H-3 1.24E1 C-14 5.73E3 Fe-55 2.70E0 Ni-59 7.50E4 Ni-63 9.60E1 Sr-90 2.91E1 Co-60 5.27E0 Nb-94 2.03E4 Tc-99 2.13E5 Sb-125 2.77E0 Cs-134 2.06E0 Cs-137 3.00E1 Am-241 4.32E2 Pu-238 8.77E1 Pu-239/240 2.41E4 Pu-241 1.44E1 Cm-243/244 2.85E1

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 7 of 10 5.0 INITIAL SUITE OF POTENTIAL RADIONUCLIDES To prepare the initial suite of potential radionuclides of concern for the decommissioning of the Zion Station, Tables 3-1, 3-2, 3-3, and 4-2 were combined to form a single list after eliminating noble gases since noble gases are not expected to be present at the time of final status survey. Table 5-1 provides the combined list of potential radionuclides.

Table 5-1 Potential Radionuclides Radionuclide Half Life (years)

H-3 1.24E1 C-14 5.73E3 CI-36 3.01E5 Ca-41 1.40E5 Mn-53 3.70E6 Fe-55 2.70E0 Ni-59 7.50E4 Co-60 5.27E0 Ni-63 9.60E1 Se-79 6.50E4 Sr-90 2.91E1 Nb-92m 2.70E7 Zr-93 1.53E6 Mo-93 3.50E3 Nb-94 2.03E4 Tc-99 2.13E5 Ag-108m 1.27E2 Sn-121m 5.50E1 Sb-125 2.77E0 I-129 1.57E7 Ba-133 1.07E1 Cs-134 2.06E0 Cs-137 3.00E1 Pm-145 1.77E1 Pm-147 2.62E0 Sm-146 1.03E8 Sm-151 9.00E1 Eu-152 1.33E1 Eu-154 8.80E0 Eu-155 4.96E0 Tb-158 1.50E2 Ho-166m 1.20E3 Hf-178m 3.10E1 Pb-205 1.43E7 U-233 1.58E5

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 8 of 10 Radionuclide Half Life (years)

Pu-238 8.77E1 Pu-239/240 2.41E4 Pu-241 1.44E1 Np-237 2.14E6 Am-241 4.32E2 Am-243 7.38E3 Cm-243/244 2.85E1 The bolded radionuclides in Table 5-1 represent those radionuclides that were identified in the 19 samples collected from the Zion Site.

Upon review of the radionuclides listed in Table 5-1 that were not identified in the 19 samples collected at the Zion Site, it became apparent that some of the radionuclides were only included based on the theoretical considerations related to neutron activation.

In order to pare down the list of potential radionuclides, the calculated activity concentrations of these theoretical neutron activation products were compared to the calculated activity concentrations of Co-60 and Ni-63. As shown in Attachment 7.2, the 2 most prominent activation products identified in the 19 samples collected at the Zion Station were Co-60 and Ni-63.

Theoretical neutron activation products listed in Table 5-1 that have calculated activity concentrations less than 0.0001 (0.01%) of both the calculated activity concentrations of Co-60 and Ni-63 will be eliminated from further consideration. Tables 5.1 and 5.3 of NUREG/CR-3734 provide calculated activity concentrations for PWR Internals and Vessel Walls based on theoretical considerations for neutron activation products. Based on the review of calculated activity concentrations the following radionuclides have been eliminated from further consideration; Cl-36, Ca-41, Mn-53, Se-79, Nb-92m, Zr-93, Mo-93, Ag-108m, Sn-12lm, I-129, Ba-133, Pm-145, Sm-146, Sm-151, Eu-155, Tb-158, Ho-166m, Hf-187m, Pb-205, and U-233.

The spreadsheet used in the evaluation theoretical neutron activation product activity concentrations is provided in Attachment 7.3.

Based on the elimination of some of the theoretical neutron activation products expected to have low activity concentrations relative to either Co-60 or Ni-63, an initial suite of potential radionuclides of concern for the decommissioning of the Zion Station has been prepared. Table 5-2 lists these radionuclides.

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 9 of 10 Table 5-2 Initial Suite of Potential Radionuclides for the Decommissioning of the Zion Station Radionuclide Half Life (years)

H-3 1.24E1 C-14 5.73E3 Fe-55 2.70E0 Ni-59 7.50E4 Co-60 5.27E0 Ni-63 9.60E1 Sr-90 2.91E1 Nb-94 2.03E4 Tc-99 2.13E5 Sb-125 2.77E0 Cs-134 2.06E0 Cs-137 3.00E1 Pm-147 2.62E0 Eu-152 1.33E1 Eu-154 8.80E0 Pu-238 8.77E1 Pu-239/240 2.41E4 Pu-241 1.44E1 Np-237 2.14E6 Am-241 4.32E2 Am-243 7.38E3 Cm-243/244 2.85E1 As the decommissioning of the Zion Station progresses the list of radionuclides in Table 5-2 may be updated as needed. The collection and analysis of site specific samples should be considered to support specific site activities and or requirements such as the derivation of surrogate relationships between the radionuclides present in support of the final status survey.

6.0 REFERENCES

6.1 NUREG/CR-3474, Long-Lived Activation Products in Reactor Materials, Pacific Northwest Laboratory, 1984.

6.2 NUREG/CR-4289, Residual Radionuclide Concentration Within and Around Commercial Nuclear Power Plants; Origin, Distribution, Inventory, and Decommissioning Assessment, Pacific Northwest Laboratory, 1985.

6.3 WINCO-1191, Radionuclides in United States Commercial Nuclear Power Reactors, Westinghouse Idaho Nuclear Company, Inc., 1994.

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 10 of 10 6.4 ICRP Publication 38, Radionuclide Transformations - Energy and Intensity of Emissions, Pergamon Press, 1983.

7.0 ATTACHMENTS 7.1 Summary of Sample Analysis Results 7.2 Detected Radionuclides 7.3 Evaluation of Theoretical Neutron Activation Products Relative to Co-60 and Ni-63

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1

.1 Summary of Sample Analysis Results

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Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1

.2 Detected Radionuclides

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 1 of 19 Half Life Radionuclide (years)

Ni-63 9.60E+01 Co-60 5.27E+OO Cs-137 3.00E+01 Sample Number 7993 Smear - Number 1 Let Down Heat Exchanger - 592' Level - Aux Building 6/27/2008 Teledyne Brown

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration 2 Sigma Uncertainty Activity Concentration Relative uCi/Total uCi/Total Time uCi/Total Fraction 1.95E-03 5.14E-05 2.82E+OO 1.91E-03 0.0458 7.23E-05 7.66E-06 2.82E+OO 5.00E-05 0.0012 4. 24E~02 1.89E-04 2.82E+OO 3.97E-02 0.9529 SUM 4.17E-02 0.9999

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 2 of 19 Radionuclide Fe-55 Ni-63 Co-60 Cs-134 Cs-'137 Am-241 Cm-2431244 Pu-238 Pu-239/240 Pu-241

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ZIONSOLUTIONS An EnergySolutions Company Sample Number 7994 Smears - Aux Building Equipment Drain Analysis Tank

560' Level *Aux Building North 3n12ooa Teledyne Brown Decay Corrected Half Life Activity Concentration 2 Sigma Uncertainty Activity Concentration Relative (years) uCilTotal uCilTotal Time uCilTotal Fraction 2.70E+OO 2.55E-03 1.01 E-03 2.82E+OO 1.24E-03 0.1006 9.60E+01 5.23E-03 7.94E-05 2.82E+OO 5.12E-03 0.41 60 5.27E+OO 2.52E-03 4.21 E-05 2.82E+OO 1.74E-03 0.141 4 2.06E+OO 1.76E-05 9.32E-06 2.82E+OO 6.84E-06 0.0006 3.00E+01 4.32E-03 5.99E-05 2.82E+OO 4.05E-03 0.3286 4.32E+02 3.73E-06 9.85E-07 2.82E+OO 3.71E-06 0.0003 2.85E+0*1 2.55E-06 7.78E-07 2.82E+OO 2.38E-06 0.0002 8.77E+01 3.55E-06 1.55E-06 2.82E+OO 3.47E-06 0.0003 2.41E+04 2.34E-06 1.12E-06 2.82E+OO 2.34E-06 0.0002 1.44E+01 1.67E-04 7.04E-05 2.82E+OO 1.46E-04 0.011 8 sur111 1.23E-02 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 3 of 19 Half Life Radionuclide (years)

Fe-55 2.70E+OO Ni-63 9.60E+01 Co-60 5.27E+OO Cs-137 3.00E+01 Am-244 4.32E+02 Cm-2431244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Pu-24*1 1.44E+01 Sample Number 7991 Smear - DAW Box - DAW Building 2128/2008 Teledyne Brown Activity Concentration 2 Sigma Uncertainty uCi/Total uCi/Total 2.61E-03 7.29E-04 7.87E-03 9.40E-05 2.54E-02 1.46E-04 4.93E-04 4.87E-05 3.40E-06 1.24E-06 1.88E-06 9.43E-07 7.59E-06 4.94E-06 2.87E-06 4.01 E-06 3.08E-04 5.84E-05

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative Time uCi/Total Fraction 2.84E+OO 1.26E-03 0.0464 2.84E+OO 7.71E-03 0.2832 2.84E+OO 1.75E-02 0.6430 2.84E+OO 4.62E-04 0.0170 2.84E+OO 3.38E-06 0.0001 2.84E+OO 1.75E-06 0.0001 2.84E+OO 7.42E-06 0.0003 2.84E+OO 2.87E-06 0.0001 2.84E+OO 2.69E-04 0.0099 SUM 2.72E-02 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 4 of 19 Half Life Radionuclide (years)

C-14 5.73E+03 Fe-55 2.70E+OO Ni-59 7.50E+04 Ni-63 9.60E+01 Sr-89 1.38E-01 Sr-90 2.91E+01 Co-60 5.27E+OO Cs-134 2.06E+OO Cs-137 3.00E+01 Am-241 4.32E+02 Cm-2431244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Pu-241 1.44E+01 Sample Number 4851 Resin

Spent Resin Storage Tank 8/30/2007 Teledyne Brown Activity Concentration 2 Sigma Uncertainty uCi/Total uCi/Total 2.31E-03 2.45E-04 2.38E-01 8.23E-03 8.95E-02 1.00E-02 9.33E+OO 3.23E-01 7.06E-03 9.42E-04 3.02E-02 1.39E-03 6.88E+OO 1.82E-02 6.10E-03 3.79E-03 8.12E-01 1.0BE-02 1.84E-04 5.09E-05 1.17E-04 3.74E-05 1.14E-04 2.12E-05 6.84E-05 1.47E-05 4.57E-02 1.58E-03

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative Time uCi/Total Fraction 3.34E+OO 2.31 E-03 0.0002 3.34E+OO 1.01 E-01 0.0070 3.34E+OO 8.95E-02 0.0061 3.34E+OO

9. 11 E+*OO 0.6253 3.34E+OO 4.07E-10 0.0000 3.34E+OO 2.79E-02 0.0019 3.34E+OO 4.44E+-00 0.3050 3.34E+OO 1.99E-03 0.0001 3.34E+OO 7.52E-01 0.0516 3.34E+OO 1.83E-04 0.0000 3.34E+OO 1.08E-04 0.0000 3.34E+OO 1.11 E-04 0.0000 3.34E+OO 6.84E-05 0.0000 3.34E+OO 3.89E-02 0.0027 SUM 1.46E+01 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 5 of 19 Half Life Radionuclide (years)

C-14 5.73E+03 Fe-55 2.70E+OO Ni-63 9.60E+01 Co-60 5.27E+OO Nb-94 2.03E+04 Cs-137 3.00E+01 Am-241 4.32E+02 Cm-242 4.46E-01 Cm-243/244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Pu-241 1.44E+01 Sample Number 4630 Smear - Spent Fuel Storage Tank Room

617' Levell - Aux Building South 8/1412007 Teledyne Brown

~

ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration 2 Sigma Uncertainty Activity Concentration Relative uCiJTotal uCiJTotal Time uCifTotal Fraction 9.84E-05 4.51 E-05 3.81 E+OO 9.84E-05 0.0014 5.90E-03 1.83E-03 3.81E+OO 2.23E-03 0.0309 4.27E-02 1.71 E-03 3.81E+OO 4.15E-02 0.5776 3.02E-02 1.53E-04 3.81 E+OO 1.83E-02 0.2548 1.15E-04 3.22E-05 3.81 E+OO

'l.15E-04 0.0016 1.04E-02 1.12E-04 3.81E+OO 9.53E-03 0.1325 3.72E-06 1.30E-06 3.81E+OO 3.70E-06 0.0001 2.92E-06 1.06E-06 3.81E+OO 7.95E-09 0.0000 2.64E-06 1.01 E-06 3.81 E+OO 2.41E-06 0.0000 2.24E-06 8.53E-07 3.81 E+OO 2.17E-06 0.0000 1.58E-06 6.76E-07 3.81 E+OO 1.58E-06 0.0000 8.67E-05 4.42E-05 3.81E+OO 7.22E-05 0.0010 SUM 7.19E-02 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 6 of 19 Half Life Radionuclide (years)

Ni-63 9.60E+01 Co-60 5.27E+OO Cs~13 7 3.00E+01 Sample Number 4703 Smear - U1 Let Down Heat Exchanger - 592' Level - Aux Building South 1/6/2006 Teledyne IBrown

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration 2 Sigma Uncertainty Activity Concentration Relative uCi/Total uCi/Total Time uCi/Total Fraction 7.58E~04 1.37E-04 4.01E+OO 7.36E-04 0.0765 9.26E-05 8.26E-06 4.01E+OO 5A7E-05 0.0057 9.69E-03 8.29E-05 4.01E+OO 8.84E-03 0.9175 SUM 9.63E-03 0.9996

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 7 of 19 Half Life Radionuclide (years)

Cs-137 3.00E+01 Ni-63 9.60E+01 Co-60 5.27E+OO Sample Number 8986 Smear - U1 Let Down Heat Exchanger 92' Level - Aux Building South 1/5/2005 Teledyne Brown

~

ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration 2 Sigma Uncertainty Activity Concentration Relative uCi/Total uCifTotal Time uCi/Total Fraction 1.05E-02 4.60E-04 5.99E+OO 9.15E-03 0.8558 1.60E-03 5.49E-05 5.99E+OO 1.53E-03 0.1434 1.84E-05 2.92E-06 5.99E+OO 8.39E-06 0.0008 SUM 1.0?E-02 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 8 of 19 Half Life Radionuclide (years)

C-14 5.73E+03 Fe-55 2.70E+OO H-3 1.24E+01 Ni-59 7.50E+04 Ni-63 9.60E+01 Sr-90 2.91E+01 Co-60 5.27E+OO Cs-134 2.06E+OO Cs-137 3.00E+01 Am-241 4.32E+02 Cm-242 4.46E-01 Cm-243/244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Pu-241 1.44E+01 Pu-242 3.76E+05 Sample Number 4130 Smear - Agua Flex Equipment 12111200*1 Eberline Activity Concentration 2 Sigma Uncertainty uCiJTotal 1.65E-02 1.00E+01 3.22E-02 1.00E+01 4.33E-05 3.00E+01 2.83E-04 1.80E+01 3.25E-02 1.00E+01 1.23E-05 1.10E+01 6.30E-02 5.00E+OO 9.72E-05 7.90E+01 2.13E-03 9.00E+OO 1.91E-05 7.00E+OO 1.26E-07 6.60E+01 1.40E-05 1.20E+01 1.05E-05 9.00E+OO 6.03E-06 1.10E+01 3.47E-04 7.00E+OO 1.59E-07 6.20E+01 Time 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01 1.00E+01

'l.OOE+01 1.00E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCiJTotal Fraction 1.65E-02 0.2407 2.49E-03 0.0364 2.47E-05 0.0004 2.83E-04 0.0041 3.02E-02 0.4417 9.70E-06 0.0001 1.70E-02 0.2481 3.41E-06 0.0000

'l.69E-03 0.0247 1.88E-05 0.0003 2.34E-14 0.0000 1.10E-05 0.0002 9.70E-06 0.0001 6.03E-06 0.0001 2.15E-04 0.0031

'l.59E-07 00000 6.85E-02 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 9 of 19 Radionuclide C-1 4 Fe-55 H-3 Ni-63 Sr-90 Co-58 Co-60 Ag-110m Sb-125 Cs-134 Cs-137 Am-244 Cm-242 Cm-2431244 Pu-238 Pu-239/240 Pu-241

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ZIONSOLUTIONS An EnergySolutions Company Sample Number 9606 Smears - Portable Demin and Rad Waste Annex

5.92* Level

Aux Building 10/4/2000 Teledyne Brown Decay Corrected Half Life Activity Concentration 2 Sigma Uncertainty Activity Concentration Relative (years) uCi/Total Time uCi/Total Fraction 5.73E+03 3.59E-02 1.00E+01 1.02E+01 3.59E-02 0.3594 2.70E+OO 5.15E~02 1.00E+01 1.02E+01 3.79E-03 0.0380 1.24E+01 4.55E~04 1.10E+01 1.02E+01 2.57E-04 0.0026 9.60E+01 2.66E-02 1.00E+01 1.02E+01 2.47E-02 0.2478 2.91E+01 1.88E-04 1.00E+01 1.02E+01 1.48E-04 0.0015 1.94E-01 1.33E~03 3.70E+01 1.02E+01 2.15E-19 0.0000 5.27E+OO 1.25E-01 5.00E+OO 1.02E+01 3.28E-02 0.3291 6.84E-01

1. 1 9E~03 3.50E+01 1.02E+01 4.00E-08 0.0000 2.77E+OO 8.54E-04 3.50E+01 1.02E+01 6.71E-05 0.0007 2.06E+OO 2.38E~04 6.60E+01 1.02E+01 7.SOE-06 0.0001 3.00E+01 1.78E-03 9.00E+OO 1.02E+01 1.41E-03 0.0141 4.32E+02 2.27E~05 8.00E+OO 1.02E+01 2.23E-05 0.0002 4.46E-01 3.76E-07 5.00E+01 1.02E+01 5.11E-14 0.0000 2.85E+01 2.65E~05 1.10E+01 1.02E+01 2.07E-05 0.0002 8.77E+01 3.34E~05 7.00E+OO 1.02E+01 3.08E-05 0.0003 2.41E+04 1.16E-05 8.00E+OO 1.02E+01 1.1 GE-05 0.0001 1.44E+01 9.77E-04 5.00E+OO 1.02E+01 5.99E-04 0.0060 SUM 9.98E-02 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 10 of 19 Half Life Radionuclide (years)

Fe-55 2.70E+OO H-3 1.24E+01 Ni-59 7.50E+04 Ni-63 9.60E+01 Sr-90 2.91E+01 Tc-99 2.13E+05 Co-60 5.27E+OO SD-125 2.77E+OO Cs-137 3.00E+01 Am-241 4.32E+02 Cm-2431244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Sam ple Number 25825 (Tl#)

Sludge - Aux Building Sump Sludge - 542' Level - Aux Building 1/312000 Teledyne Brown Activity Concentration 2 Sigma Uncertainty uCi/Total uCi/Total Time 1.65E-01 4.00E-03 1.10E+01 3.49E-03 4.BOE-04

'L10E+01 1.48E-03 4.90E-04

'l.10E+01 1.23E-01 2.00E-03 1.10E+01 9.23E-05 2.58E-05 1.10E+01 1.41E-04 3 OOE-05 1.10E+01 8.71E-01 8.70E-02 1.10E+01 7.34E-03 1.05E-03

'l.10E+01 6.82E-03 6.80E-04 1.10E+01 1.54E-05 4.10E-06 1.10E+01 2.73E-05 5.70E-06 1.10E+01 3.64E-05 7.BOE-06 1.10E+01 1.05E-05 4.00E-06 1.10E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activrty Concentration Relative uCi/Total Fraction 9.89E-03 0.0292 1.89E-03 0.0056

'l.48E-03 0.0044 1.14E-01 0.3353 7.11E-05 0.0002 1.41E-04 0.0004 2.06E-01 0.6078 4.72E-04 0.0014 5.29E-03 0.0156 1.51E-05 0.0000 2.09E-05 0.0001 3.34E-05 0.000*1 1.05E-05 0.0000 3.39E-01 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 11 of 19 Half life Radionuclide (years)

C-14 5.73E+03 Fe-55 2.70E+OO H-3 1.24E+01 Ni-63 9.60E+01 Sr-90 2.91E+01 Tc-99 2.13E+05 Mn-54 8.56E-0 1 Co-57 7.42E-01 Co-60 5.27E+OO Sb-125 2.77E+OO Cs-134 2.06E+OO Cs-137 3.00E+01 Am-241 4.32E+02 Cm-243/244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Sample Number 25826 (Tl#)

Smear - Chem Draw Tank Room - 560' Level - Aux Building North 12/1411999 Teledyne IBrown Activity Concentration 2 Sigma Uncertainty uCi/Total uCi/Total Time 6.0?E-05 1.77E-05 1.1 0E+01 2.12E-02 1.30E-03 1.10E+01 3.28E-06 1.08E-06 1.10E+01 7.50E-03 1.60E-04 1 :10E+01 1.46E-04 3.50E-05 1.1 0E+01 4.55E-05 2.23E-05 1.10E+01 2.3'1E-04 7.10E-05 1.1 0E+01 3.36E-05 1.36E-05 1.10E+01 9.50E-02 9.50E-03 1 :10E+01 1.63E-03 1.63E-04 1.10E+01 3.95E-04 8.70E-05 1.1 0E+01 4.90E-03 4.90E-04 1.10E+01 4.96E-06 1.78E-06 1.1 0E+01 4.38E-06 1.67E-06 1.10E+01 6.22E-06 2.24E-06 1.10E+01 2.77E-06 4.50E-06 1.1 0E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCi/Total Fraction 6.06E-05 0.0017 1..27E-03 0.0365 1.77E-06 0.0001 6.93E-03 0.1990 1.12E-04 0.0032 4.55E-05 0.0013 3.21E-08 0.0000 1.19E-09 0.0000 2.25E-02 0.6452 1.05E-04 0.0030 9.91E-06 0.0003 3.80E-03 0.1092 4.87E-06 0.0001 3.35E-06 0.0001 5.70E-06 0.0002 2.77E-06 0.0001 3.48E-02 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 12 of 19 Half Life Radionuclide (years)

C-14 5.73E+03 Cs-137 3.00E+01 Fe-55 2.70E+OO H-3 1.24E+01 Ni-63 9.60E+01 Sr-90 2.91E+01 Co-60 5.27E+OO Sb~125 2.77E+OO Am-241 4.32E+02 cm~242 4.46E-01 Cm-2431244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Pu-241 1.44E+01 Sample Number 9870118 Smears* DAW 1/22/1999 Teledyne Brown Activtty Concentration 2 Sigma Uncertainty uCi/Total 3.63E~03 1.00E+01 4.16E-02 5.00E+OO 6.85E~03 1.10E+01 5.99E~04 1.10E+01 4.66E~02 1.00E+01 1.20E-04 1.00E+01 1.52E-01 5.00E+OO 3-41E-03 2.60E+01 3.73E-05 6.00E+OO 4.82E-07 2.90E+01 1.24E-05 1.10E+01 2.15E-05 9.00E+OO 1.33E-05 1.00E+01 7.00E~04 1.30E+01 Time 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 1.19E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCi/Total Fraction 3.62E-03 0.0325 3.16E-02 0.2841 3.26E-04 0.0029 3.08E-04 0.0028 4.28E-02 0.3841 9.05E-05 0.0008 3.19E-02 0.2869 1.75E-04 0.0016 3.GGE-05 0.0003 4.?0E-15 0.0000 9.29E-06 0.0001 1.96E-05 0.0002 1.33E-05 0.0001 3.95E-04 0.0036 1.11 E-01 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 13 of 19 Half Life Radionuclide (years)

Cs-137 3.00E+01 Fe-55 2.70E+OO H-3 1.24E+01 Ni-59 7.50E+04 Ni-63 9.60E+01 Tc-99 2.13E+05 Co-60 5-27E+OO Sb-125 2.77E+OO Cs-134 2.06E+OO Sample Number 25824 (Tl#)

Resin - Number 2 Condensate Dem in - 592' Level - Aux Buillding 11/1 0/1999 Teledyne Brown Activity Concentrat 1ion 2 Sigma Uncertainty uCi/Total uCi/Total Time 1.03E-02 3.00E-04 1.11 E+01 1.76E-03 6.10E-04 1.11 E+01 1.74E-03 2.50E-04 1.11E+01 1.97E-03 7.60E-04 1.11 E+01 1.69E-01 3.00E-03 1.11 E+01 1.24E-04 3.30E-05 1.1 1E+01 3.04E-02 3.00E-03 1.11 E+01 5.72E-04 1.21 E-04 1.11 E+01 2.65E-04 8.1 OE-05 1.11 E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCi/Total Fraction 7.98E-03 0.0458 1.03E-04 0.0006 9.35E-04 0.0054 1.97E-03 0.0113 1.SGE-01 0.8953 1.24E-04 0.0007 7.10E-03 0.0407 3.59E-05 0.0002 6.43E-06 0.0000 1.74E-01 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 14 of 19 Half Life Radionuclide (years)

Cs-137 3.00E+01 Fe-55 2.70E+OO H-3 1.24E+01 Ni-63 9.60E+01 Sr-90 2.91E+01 Tc-99 2.13E+05 Co-60 5.27E+OO Sample Number 25822 (Tl#)

Resin - 2A Boric Acid Feed System - 592' Level - Aux Building 11/10,/1999 Teledyne Brown Activity Concentration 2 Sigma Uncertainty uCi/Total uCi/Total Time 2.43E-03 1.BOE-04 1.11 E+01 2.42E-02 3.10E-03 1.11 E+01 1.72E-03 4.BOE-04 1.11 E+01 1.29E-01 3.00E-03 1.11 E+01 6.57E-05 3.69E-05 1.11 E+01 1.97E-03 1.70E-04 1.11 E+01 1.00E+OO 1.00E-01 1.11 E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCi/Total Fraction 1.88E-03 0.0052 1.41E-03 0.0039 9.24E-04 0.0026 1.19E-01 0.3320 5.05E-05 0.0001 1.97E-03 0.0055 2.33E-01 0.6506 3.59E-01 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 15 of 19 Half Life Radionuclide (years)

C-14 5.73E+03 Cs-137 3.00E+01 Fe-55 2.70E+OO H-3 1.24E+01 Ni-63 9.60E+01 Sr-89 1.38E-01 Sr-90 2.91E+01 Co-.SO 5.27E+OO Sb-124 1.65E-01 Am-241 4.32E+02 Cm-242 4.46E-01 Cm-2431244 2.85E+01 Pu-241 1.44E+01 Sample Number 9977 Resin - Number 3 Portable Demin - Radwaste - 592' Level - Aux Building 12/3/1998 Teledyne Brown

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration 2 Sigma Uncertainty Activity Concentration Relative uCi/Total Time uCi/Total Fraction 6.75E-05 2.90E+01 1.21 E+01 6.74E-05 0.0082 1.05E-03 1.50E+01 1.21 E+01 7.94E-04 0.0969 1.07E-03 1.40E+01 1.21 E+01 4.84E-05 0.0059 6.24E-05 2.00E+01 1.21 E+01 3.17E-05 0.0039 4.54E-03 1.00E+01 1.21 E+01 4.16E-03 0.5081 1.32E-04 3.60E+01 1.21 E+01 7.40E-31 0.0000 8.76E-05 1.60E+01 1.21 E+01 6.57E-05 0.0080 1.47E-02 6.00E+OO 1.21 E+01 3.01E-03 0.3675 4.81E-04 3.90E+01 1.21 E+01 4.49E-26 0.0000 8.74E-08 7.60E+01 1.21 E+01 8.57E-08 0.0000 2.54E-07 4.20E+01 1.21 E+01 1.82E-15 0.0000 1.63E-07 5.00E+01 1.21 E+01 1.22E-07 0.0000 2.05E-05 6.30E+01 1.21 E+01 1.15E-05 0.0014 SUM 8.19E-03 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 16 of 19 Half Life Radionuclide (years)

Fe-55 2.70E+OO H-3 1.24E+01 Ni-63 9.60E+01 Sr-90 2.91E+01 Co-60 5.27E+OO Cs-134 2.06E+OO Cs-137 3.00E+01 Am-241 4.32E+02 Cm-242 4.46E-01 Cm-243l 244 2.85E+01 Pu-241 1.44E+01 Sample Number 9974 Resin

Number 2 Portable Dem in

592' Level *Aux Building 12/3/1998 Teledyne Brown Activity Concentration 2 Sigma Uncertainty uCi/Total Time 1.33E-03 1.30E+01 1.21 E+01 5.23E~5 2.60E+01 1.21 E+01 2.91E-03 1.00E+01 1.21 E+01 4.91E-05 1.40E+01 1.21 E+01 2.21E-03 6.00E+OO 1.24 E+01 2.26E-05 1.00E+02 1.24 E+01 4.40E-04 1.10E+01 1.21 E+01 2.96E-07 3.60E+01 1.21 E+01 1.17E-06 2.00E+01 1.21 E+01 9.91E-07 2.00E+01 1.21 E+01 1.96E-04 1.70E+01 1.21 E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCi/Total Fraction 6.01E-05 0.0163 2.66E-05 0.0072 2.67E-03 0.7234 3.68E-05 0.0100 4.52E-04 0.1227 3.92E-07 0.0001 3.33E-04 0.0903 2.90E-07 0.0001 8.36E-15 0.0000 7.39E-07 0.0002 1.10E-04 0.0297 3.69E-03 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 17 of 19 Half Life Radionuclide (years)

C-14 5.73E+03 Fe-55 2.70E+OO H-3 1.24E+01 Ni-59 7.50E+04 Ni-63 9.60E+01 Sr-90 2.91E+01 Mn-54 8.56E-01 Co-57 7.42E-01 Co-58 1.94E-01 Co-60 5.27E+OO Sb-125 2.77E+OO Cs-134 2.06E+OO Cs-137 3.00E+01 Am-241 4.32E+02 Cm-242 4.46E-01 Cm-243/244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Pu-241 1.44E+01 Sample Number 7699 Resin

Boric Acid Feed Demin

592' Level *Aux Building 5f7/1 998 Teledyne Brown Activity Concentration 2 Sigma Uncertainty uCi/Total Time 8.56E-04 1.00E+01 1.27E+01 6.07E-02 1.00E+01 1.27E+01 3.28E-04 1.20E+01 1.27E+01 8.08E-04 3.10E+01 1.27E+01 8.35E-02 1.00E+01 1.27E+01 1.20E-04 1.20E+01 1.27E+01 1.82E-03 2.10E+01 1.27E+01 1.01E-03 1.10E+01 1.27E+01 2.08E-02 9.00E+OO 1.27E+01 1.06E-01 5.00E+OO 1.27E+01 3.59E-03 1.50E+01 1.27E+01 7.24E-03 7.00E+OO 1.27E+01 1.38E-02 5.00E+OO 1.27E+01 2.76E-06 1.20E+01 1.27E+01 1.10E-06 2.70E+01 1.27E+01 2.65E-06 1.50E+01 1.27E+01 3.35E-06 1.10E+01 1.27E+01 1.60E-06 1.50E+01 1.27E+01 1.02E-04 2.00E+01 1.27E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCi/Total Fraction 8.55E-04 0.0077 2.35E-03 0.0212 1.61E-04 0.0015 8.0BE-04 0.0073 7.62E-02 0.6856 8.BBE-05 0.0008 6.40E-08 0.0000 7.36E-09 0.0000 4.52E-22 0.0000 2.01E-02 0.1805 1.51E-04 0.0014 1.03E-04 0.0009 1.03E-02 0.0927 2.70E-06 0.0000 3.10E-15 0.0000 1.95E-06 0.0000 3.03E-06 0.0000 1.60E-06 0.0000 5.55E-05 0.0005 1.11 E-01 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 18 of 19 Half Life Radionuclide (years)

C-14 5.73E+03 Fe-55 2.70E+OO H-3 1.24E+01 Ni-59 7.50E+04 Ni-63 9.60E+01 Sr-90 2.91E+01 Mn-54 8.56E-01 Co-57 7.42E-01 Co-58 1.94E-01 Co-60 5.27E+OO Sb-125 2.77E+OO Cs-134 2.06E+OO Cs-137 3.00E+01 Am-241 4.32E+02 Cm-242 4.46E-01 Cm-243/244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Pu-241 1.44E+01 Sample Number 7696 Resin - Number 1 Condensate Demin - 592' Level - Aux Building sn1199s Teledyne Brown Activity Concentration 2 Sigma Uncertainty uCi/Total Time 4.25E-04 1.10E+01 1.27E+01 1.45E-02 1.00E+01 1.27E+01 4.53E-04 1.10E+01 1.27E+01 2.03E-04 3.50E+01 1.27E+01 4.07E-02 1.00E+01 1.27E+01 3.11E-05 1.20E+01 1.27E+01 1.30E-03 2.20E+01 1.27E+01 4.52E-04 1.90E+01 1.27E+01 1.08E-02 L20E+01 1.27E+01 5.58E-02 5.00E+OO 1.27E+01 1.07E-03 3.20E+01 1.27E+01 8.82E-04 2.20E+01 1.27E+01 8.07E-03 6.00E+OO 1.27E+01 1.56E-06 1.60E+01 1.27E+01 4.52E-07 4.10E+01 1.27E+01 1.17E-06 2.00E+01 1.27E+01 1.44E-06 1.70E+01 1.27E+01 7.00E-07 2.20E+01 1.27E+01 6.46E-05 2.80E+01 1.27E+01 SUM

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ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCi/Total Fraction 4.24E-04 0.0077 5.62E-04 0.0102 2.23E-04 0.0040 2.03E-04 0.0037 3.71E-02 0.6722 2.30E-05 0.0004 4.57E-08 0.0000 3.29E-09 0.0000 2.35E-22 00000 1.0GE-02 0.191 1 4.51E-05 0.0008 1.25E-05 0.0002 6.02E-03 0.1090 1.53E-06 0.0000 1.27E-15 00000 8.GOE-07 0.0000 1.30E-06 0.0000 7.00E-07 0.0000 3.51E-05 0.0006 5.53E-02 1 0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Page 19 of 19 Half Life Radionuclide (years)

C-14 5.73E+03 Fe-55 2.70E+OO H-3 1.24E+01 Ni-59 7.50E+04 Ni-63 9.60E+01 Sr-90 2.91E+01 Mn-54 8.56E-01 Co-57 7.42E-01 Co-58 1.94E-01 Co-60 5.27E+OO Nb-94 2.03E+04 Sb-125 2.77E+OO Cs-134 2.0GE+OO Cs-137 3.00E+01 Ce-144 7.78E-0 1 Am-241 4.32E+02 Cm-242 4.46E-01 Cm-2431244 2.85E+01 Pu-238 8.77E+01 Pu-239/240 2.41E+04 Pu-241 1.44E+01 Sample Number 7695 Resin - Spent Resin Storage Tank-617' Level -Aux Building 4/3/1998 Teledyne Brown Activity Concentration 2 Sigma Uncertainty uCi/Total Time 6.08E-02 1.00E+01 1.27E+01 1.89E+OO 1.00E+01 1.27E+01.

2.07E-04 1.60E+01 1.27E+01 5.88E-02 1.60E+01 1.27E+01 7.41 E+OO 1.00E+01 1.27E+01 5.42E-03 1.40E+01 1.27E+01 2.48E-01 6.00E+OO 1.27E+01 8.77E-02 6.00E+OO 1.27E+01 1.34E+OO 6.00E+OO 1.27E+01 3.18E+OO 5.00E+OO 1.27E+01 1.48E-03 2.50E+01 1.27E+01 4.69E-01 6.00E+OO 1.27E+01 3.27E-02 7.00E+OO 1.27E+01 1.33E-01 5.00E+OO 1.27E+01 1.79E-03 5.60E+01 1.27E+01 3.64E-05 1.00E+01 1.27E+01 5.54E-05 1.40E+01 1.27E+01 6.85E-05 1.20E+01 1.27E+01 6.98E-05 8.00E+OO 1.27E+01 2.37E-05 1.00E+01 1.27E+01 1.98E-03 1.30E+01 1.27E+01.

SUM

~

ZIONSOLUTIONS An EnergySolutions Company Decay Corrected Activity Concentration Relative uCi/Total Fraction 6.07E-02 0.0079 7.33E-02 0.0095 1.02E-04 0.0000 5.88E-02 0.0077 6.76E+OO 0.8801 4.01E-03 0.0005 8.72E-06 0.0000 6.39E-07 0.0000 2.91E-20 0.0000 6.02E-04 0.0783 1.48E-03 0.0002 1.97E-02 0.0026 4.64E-04 0.0001 9.93E-02 0.0129 2.28E-08 0.0000 3.57E-05 0.0000 1.56E-13 0.0000 5.03E-05 0.0000 6.32E-05 0.0000 2.37E-05 0.0000 1.08E-03 0.0001 7.68E+OO 1.0000

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1

.3 Evaluation of Theoretical Neutron Activation Products Relative to Co-60 and Ni-63

Potential Radionuclides of Concern During the Decommissioning of the Zion Station TSD-11-001, Rev. 1 Evaluation of Theoretical Neutron Activation Products Relative to Co-60 and Ni-63 From Table 5.1 of NUREG CR-3734 From Table 5.3 of NUREG CR-3734 Shroud Core Barrel Thermal Pads Vessel Cladding Pres Vessel Walls Radionuclides Activity Conc Ci/g Activity Conc Ci/g Activity Conc Ci/g Activity Conc Ci/g Activity Conc Ci/g Co-60 1.30E-01 1.40E-02 2.00E-03 3.30E-04 3.20E-02 Ni-63 1.80E-02 2.40E-03 3.80E-04 5.40E-05 5.70E-03 0.01% Limit 1.80E-06 2.40E-07 3.80E-08 5.40E-09 5.70E-07 Cl-36 5.10E-07 6.40E-08 1.00E-08 1.40E-09 1.60E-07 Ca-41 4.70E-09 5.60E-10 8.60E-11 1.20E-11 1.40E-09 Mn-53 3.30E-09 2.10E-10 1.00E-11 6.90E-12 4.60E-10 Se-79 6.10E-10 4.60E-11 4.70E-12 1.20E-12 1.00E-10 Nb-92m 1.20E-12 6.50E-14 3.20E-15 2.00E-15 4.50E-14 Zr-93 1.10E-10 3.90E-12 2.90E-13 8.60E-14 1.00E-11 Mo-93 9.40E-07 3.90E-08 2.10E-09 1.10E-09 7.70E-08 Ag-108m

<1E-7

<9E-9

<1.1E-9

<2.2E-10

<2.0E-8 Sn-121m 4.80E-09 3.40E-10 1.70E-11 1.10E-11

<7.6E-18 I-129

<6E-13

<1.4E-14

<7.9E-16

<1.1E-16

<4.2E-14 Ba-133

<6E-6

<3E-7

<4.5E-8

<7.1E-9

<7.4E-7 Pm-145 8.90E-10 1.40E-10 2.20E-11 3.10E-12

<3.1E-10 Sm-146 1.00E-16 1.30E-17 6.70E-19 4.30E-19 2.90E-17 Sm-151 4.60E-09 4.50E-09 2.90E-09 5.90E-10 3.80E-9 Eu-152 0

9.10E-10 1.70E-07 7.60E-08 2.20E-14 Eu-154 5.70E-07 6.00E-07 6.20E-08 1.20E-08 9.10E-07 Eu-155 4.10E-07 1.40E-07 5.00E-09 5.20E-10 3.60E-07 Tb-158 1.90E-09 1.70E10 8.50E-12 5.60E-12 3.80E-10 Ho-116m 1.60E-07 1.30E-08 1.10E-09 3.00E-10 2.80E-08 Hf-178m 4.30E-08 2.80E-08 3.10E-09 1.20E-09

<3.7E-8 Pb-205 1.80E-12 1.30E-13 1.30E-14 3.40E-15 2.90E-13 U-233

<3.6E-10 1.0E-10 1.1E-11 3.40E-12

<1.6E-10 Bolded Values Exceed 0.01% of Either the Co-60 or Ni-63 Activity Concentrations