ML25345A111
| ML25345A111 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 12/11/2025 |
| From: | Holtec Decommissioning International, Radiation Safety & Control Services |
| To: | Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML25345A092 | List:
|
| References | |
| HDI 25-039 25-015, Rev 0 | |
| Download: ML25345A111 (0) | |
Text
RSCS TSD 24-017 Rev 0 D1 Page 1 of 24 Page 1 of 24 Distribution Coefficient (Kd) of Radionuclides in Soil Samples from Chalk River Laboratories OFFICIAL USE ONLY / USAGE EXCLUSIF Building Surface DCGL Values -
Oyster Creek Technical Support Document No.25-015 Revision 0 Prepared by:
Joseph Bisson, Technical Consultant Reviewed by:
William Parish, CHP, Sr. Health Physicist Approved by:
Eric Darois, CHP, Executive Director Radiation Safety & Control Services, Inc 93 Ledge Road, Seabrook, NH 03874 1-800-525-8339 (603) 778-2871 (Outside USA) www.radsafety.com April 2, 2025 ctRscs Radiation Safety & Control Services RSCS Radiation Safety & Control Services 91 Portsmouth Avenue, Stratham, NH 03885-2468 phone: 1-800-525-8339
- fax: 603-778-6879 i nfo@rad safety. com www. rad safety. com
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 2 of 24 Contents 1
Introduction......................................................................................................................... 3 2
Method of Calculation......................................................................................................... 3 3
Scenario Assumptions and Input......................................................................................... 3 4
Calculations and Results.................................................................................................... 12 5
References......................................................................................................................... 14
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 3 of 24 1 Introduction The purpose of this calculation is to develop building surface-derived concentration guideline levels (DCGLs) to support characterization and final status surveys at the Oyster Creek Nuclear Generating Station (OCNGS) site. The DCGL values developed herein are site-specific for OCNGS.
2 Method of Calculation RESRAD-Build v4.0 was used in the development of the DCGL values.
Probabilistic (sensitivity) analysis to risk-sensitive RESRAD-Build parameters (i.e., parameters that have a significant impact on the calculated dose with a change in input value) was performed previously [1]
and identified 6 risk-sensitive parameters: deposition velocity, resuspension rate, room air exchange rate, indirect ingestion rate, air release fraction, and time for source removal. Additionally, reasonably conservative input values were determined for the risk-sensitive parameters.
RESRAD-Build code executions were performed for each of the radionuclides-of-concern (ROCs) for the OCNGS site. The RESRAD-Build results (i.e., mrem/y per 1.0 pCi/m2) were used as conversion factors (CF) to develop DCGL values that corresponded to 25 mrem/y (the dose criterion for unrestricted release established in 10CFR20.1402). This was accomplished as follows:
(25 mrem/y) ÷ (RESRAD-Build CF (mrem/y per pCi/m2)) = DCGL25 (pCi/m2).
The unit conversion of DCGL values from pCi/m2 to dpm/100 cm2 was accomplished as follows:
DCGL25 (pCi/m2) x (2.22 dpm/1 pCi) x (1 m2/10000 cm2) x 100 = DCGL25 (dpm/100 cm2) 3 Scenario Assumptions and Input Assumptions The critical receptor is a hypothetical worker assumed to perform work activities inside a contaminated room for 45 hours5.208333e-4 days <br />0.0125 hours <br />7.440476e-5 weeks <br />1.71225e-5 months <br /> per week for 52 weeks.
The critical receptor receives radiation exposure through the following exposure pathways:
o direct external exposure from the source (i.e., residual radioactive material on the floor, walls, and ceiling),
o external exposure from deposited airborne material, o `external exposure due to air submersion, o exposure due to inhalation of airborne radioactive material, o indirect ingestion of radioactive material from the sources and material deposited on the surface The representative room modeled for the OCNGS site is based on the median room size for the buildings expected to remain on-site at license termination, 57 m2: modeled as a 7.5 m by 7.5 m room with 3 m walls. The room includes 6 area sources (i.e. floor, 4 walls, and ceiling).
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 4 of 24 The ROCs identified for the OCNGS site are shown in Table 1 below. Progeny radionuclides are automatically included in RESRAD-Build with ROC input.
Table 1. Radionuclide Input for RESRAD-Build ROC Progeny ROC Progeny Am-241 Np-237, Th-229, U-233 Nb-94 C-14 Ni-63 Cm-243 Ac-227, Pa-231, Pu-239, U-235 Np-237 Th-229, U-233 Cm-244 Pu-240, Ra-228, Th-228, Th-232, U-236 Pu238 Pb-210, Po-210, Ra-226, Th-230, U-234 Cs-137 Pu-239 Ac-227, Pa-231, U-235 Co-60 Pu-240 Ra-228, Th-228, Th-232, U-236 Eu-152 Gd-152 Pu-241 Am-241, Np-237, Th-229, U-233 Eu-154 Sb-125 Te-125m Fe-55 Sr-90 H-3 Tc-99 Mn-54 Input Values from NUREG/CR-5512 [2], NUREG/CR-6755 [3], and NUREG/CR-7267 [4] were assigned for the following parameters:
o Exposure duration: 365.25 d o Indoor fraction: 0.267 (= (45 h/week
- 52 weeks/y) ÷ (24 h/day
- 365.25 days/y))
o Breathing rate: 33.6 m3/d o Receptor location (center of room): 3.75 m, 3.75 m, 1.0 m o Air release fraction for H-3: 1.0 o Removable fraction: 0.1 o Room area: 57 m2 (modeled as 7.5 m by 7.5 m) o Room height: 3m o Direct ingestion rate, 4.91E-7 h-1 o Initial ROC concentration: 1 pCi/m2 The following RESRAD-Build parameters have been identified as risk-sensitive one or more of the OCNGS ROCs are:
o deposition velocity o resuspension rate o room air exchange rate o indirect ingestion rate o air release fraction o time for source removal Percentile values (i.e., 25th, 50th, and 75th) from the distributions used as input in the probabilistic analysis for RESRAD-Build parameters have been determined [1]. The 25th or 75th percentile values were used
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 5 of 24 as reasonably conservative input values risk-sensitive parameters; the 50th percentile value was used as input if a parameter was not identified as sensitive. Table 2 summarizes the 25th, 50th, and 75th percentile values and identifies the ROC to which each percentile value was assigned.
Table 3 summarizes the input values for all the RESRAD-Build parameters, including the application of the 25th/50th/75th percentile values by ROC.
Table 2: Percentile Values for Sensitive RESRAD-Build Parameters Sensitive Parametera Percentile Value 25th 50th 75th LAMBDAT 8.4E-01 1.5E+00 2.7E+00 UD 1.5E-05 8.5E-05 4.8E-04 DKSUS 6.6E-10 1.8E-08 4.7E-07 INGE 5.0E-05 9.0E-05 1.6E-04 AIRFR(1) 1.6E-01 3.2E-01 5.2E-01 AIRFR(2) 1.6E-01 3.2E-01 5.2E-01 AIRFR(3) 1.6E-01 3.2E-01 5.2E-01 AIRFR(4) 1.6E-01 3.2E-01 5.2E-01 AIRFR(5) 1.6E-01 3.2E-01 5.2E-01 AIRFR(6) 1.6E-01 3.2E-01 5.2E-01 RFO(1) 1.8E+04 3.3E+04 5.3E+04 RFO(2) 1.8E+04 3.3E+04 5.3E+04 RFO(3) 1.8E+04 3.3E+04 5.3E+04 RFO(4) 1.8E+04 3.3E+04 5.3E+04 RFO(5) 1.8E+04 3.3E+04 5.3E+04 RFO(6) 1.8E+04 3.3E+04 5.3E+04 a LAMBDAT = building air exchange rate, UD = deposition velocity, DKSUS = resuspension rate, INGE
= indirect ingestion rate, AIRFR(#) = air release fraction (for source number), and RFO(#) = source removal time (for source number).
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 6 of 24 Table 3. RESRAD-BUILD Input Values for Development of Building Surface DCGL Values (Building Occupancy Scenario)
Parameter Typea Nuclide Value/Distribution Value Reference Source Exposure Duration (d)
B All ROCs 365.25 NUREG/CR-5512; NUREG/CR-7267 Indoor Fraction B
All ROCs 0.267 NUREG/CR-5512; NUREG/CR-7267 Evaluation Time (y)
P All ROCs 1
(1, 5, 10, 25, 50 for Pu-241)
T=1 corresponds to dose over the 1st year; multiple input applied to Pu241 verify time of peak dose Number of Rooms P
All ROCs 1
NUREG/CR-5512 building occupancy scenario assumption Deposition Velocity (m/s)
P Am-241, Cm-243, Cm-244, Np-237, Pu-238, Pu-239, Pu-240, Pu-241 C-14, Co-60, Cs-137, Eu-152, Eu-154, Fe-55, H-3, Mn-54, Nb-94, Ni-63, Sb-125, Sr-90, Tc-99 8.5E-05 4.8E-04 50th percentile value 75th percentile value Resuspension Rate (s-1)
P C-14, Co-60, Cs-137, Eu-152, Eu-154, Fe-55, H-3, Mn-54, Nb-94, Ni-63, Sb-125, Sr-90, Tc-99 Am-241, Cm-243, Cm-244, Np-237, Pu-238, Pu-239, Pu-240, Pu-241 6.6E-10 1.8E-08 25th percentile value 50th percentile value Air Exchange Rate for Room (h-1)
P All ROCs 8.4E-01 25th percentile value Room Area (m2)
P All ROCs 57 OCNGS median room size Room Height (m)
P All ROCs 3
Conservative representative wall height Time Fraction B
All ROCs 1
NUREG/CR-7267 Inhalation Rate (m3/d)
M All ROCs 33.6 NUREG/CR-5512 Indirect Ingestion Rate (m2/h)
B Cm-243, Cm-244, Eu-152, Eu-154, Pu-238, Pu-241 Am-241, Fe-55, Co-60, Mn-54, Pu-240, Sb-125 C-14, Cs-137, H-3, Nb-94, Ni-63, Np-237, Pu-239, Sr-90, Tc-99 5.0E-05 9.0E-05 1.6E-04 25th percentile value 50th percentile value 75th percentile value Receptor Location B
All ROCs 3.75, 3.75, 1 center of room based on median room size Shielding Thickness (cm)
P All ROCs 0
no shielding assumed
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 7 of 24 Table 3. RESRAD-BUILD Input Values for Development of Building Surface DCGL Values (Building Occupancy Scenario)
Parameter Typea Nuclide Value/Distribution Value Reference Source Shielding Density (g/cm3)
P All ROCs 1
Input value required for code execution - input has no impact due to shield thickness input Shielding Material P
All ROCs water Input value required for code execution - input has no impact due to shield thickness input Number of Sources P
All ROCs 6
Includes floor, ceiling and 4 walls consistent to scenario assumptions in NUREG/CR-6755 and NUREG/CR-7267 External Dose Conversion Factor, (mrem/y per pCi/cm2)
M All ROCs RESRAD-Build library Values were from Federal Guidance Report No.12 (FGR-12).
Air Submersion Dose Conversion Factor, (mrem/y per pCi/m3)
M All ROCs RESRAD-Build library Values were from Federal Guidance Report No.12 (FGR-12).
Inhalation Dose Conversion
- Factor, (mrem/pCi)
M All ROCs RESRAD-Build library Values were from Federal Guidance Report No.11 (FGR-11).
Ingestion Dose Conversion
- Factor, (mrem/pCi)
M All ROCs RESRAD-Build library Values were from Federal Guidance Report No.11 (FGR-11).
Source 1: Floor Type P
All ROCs Area NUREG/CR-5512 Direction P
All ROCs Z
NUREG/CR-5512 Location of Center of Source: x,y,z (m)
P All ROCs 3.75, 3.75, 0 Center of floor based on dimensions for median room size Source length X-axis (m)
P All ROCs 7.5 Based on area dimensions median room size Source length Y-axis (m)
P All ROCs 7.5 Based on area dimensions median room size Area (m2)
P All ROCs Source length input used Air Release Fraction B
H-3 All others 1.0 5.2E-01 NUREG/CR-7267 75th percentile value Direct Ingestion (h-1)
B All ROCs 4.91E-7 NUREG/CR6755 Removable Fraction P
All ROCs 0.1 NUREG/CR-5512 and NUREG/CR-6755
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 8 of 24 Table 3. RESRAD-BUILD Input Values for Development of Building Surface DCGL Values (Building Occupancy Scenario)
Parameter Typea Nuclide Value/Distribution Value Reference Source Time for Source Removal (d)
P Am-241, Cm-243, Cm-244, H-3, Ni-63, Np-237, Pu-238, Pu-239, Pu-240, Pu-241, Sr-90, Tc-99 C-14, Co-60, Cs-137, Eu-152, Eu-154, Fe-55, Mn-54, Nb-94, Sb-125 1.8E+04 5.3E+04 25th percentile value 75Th percentile value Radionuclide Concentration (pCi/m2)
P All ROCs 1.0 Source 2: Wall 1 Type P
All ROCs Area NUREG/CR-5512 Direction P
All ROCs Y
NUREG/CR-5512 Location of Center of Source: x,y,z (m)
P All ROCs 3.75, 0, 1.5 Center of floor based on dimensions for median room size Source length X-axis (m)
P All ROCs 7.5 Based on area dimensions median room size Source length Z-axis (m)
P All ROCs 3
Conservative representative wall height Area (m2)
P All ROCs Source dimension used Air Release Fraction B
H-3 All others 1.0 5.2E-01 NUREG/CR-7267 75th percentile value Direct Ingestion (h-1)
B All ROCs 4.91E-7 NUREG/CR6755 Removable Fraction P
All ROCs 0.1 NUREG/CR-6755 Time for Source Removal (d)
P Am-241, Cm-243, Cm-244, H-3, Nb-94, Ni-63, Np-237, Pu-238, Pu-239, Pu-240, Pu-241, Sr-90, Tc-99 Eu-152, Eu-154, C-14, Co-60, Cs-137, Fe-55, Mn-54, Sb-125 1.8E+04 3.3E+04 5.3E+04 25th percentile value 50th percentile value 75Th percentile value Radionuclide Concentration (pCi/m2)
P All ROCs 1.0 Source 3: Wall 2 Type P
All ROCs Area NUREG/CR-5512 Direction P
All ROCs X
NUREG/CR-5512 Location of Center of Source: x,y,z (m)
P All ROCs 0.0, 3.75, 1.5 Center of floor based on dimensions for median room size
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 9 of 24 Table 3. RESRAD-BUILD Input Values for Development of Building Surface DCGL Values (Building Occupancy Scenario)
Parameter Typea Nuclide Value/Distribution Value Reference Source Source length Y-axis (m)
P All ROCs 7.5 Based on area dimensions median room size Source length Z-axis (m)
P All ROCs 3
Conservative representative wall height Area (m2)
P All ROCs Source dimension used Air Release Fraction B
H-3 All others 1.0 5.2E-01 NUREG/CR-7267 75th percentile value Direct Ingestion (h-1)
B All ROCs 4.91E-7 NUREG/CR6755 Removable Fraction P
All ROCs 0.1 NUREG/CR-6755 Time for Source Removal (d)
P Am-241, Cm-243, Cm-244, Eu-154, H-3, Nb-94, Ni-63, Np-237, Pu-238, Pu-239, Pu-240, Pu-241, Sr-90, Tc-99 Eu-152, Fe-55 C-14, Co-60, Cs-137, Mn-54, Sb-125 1.8E+04 3.3E+04 5.3E+04 25th percentile value 50th percentile value 75Th percentile value Radionuclide Concentration (pCi/m2)
P All ROCs 1.0 Source 4: Wall 3 Type P
All ROCs Area NUREG/CR-5512 Direction P
All ROCs Y
NUREG/CR-5512 Location of Center of Source: x,y,z (m)
P All ROCs 3.75, 7.5, 1.5 Center of floor based on dimensions for median room size Source length X-axis (m)
P All ROCs 7.5 Based on area dimensions median room size Source length Z-axis (m)
P All ROCs 3
Conservative representative wall height Area (m2)
P All ROCs Source dimension used Air Release Fraction B
H-3 All others 1.0 5.2E-01 NUREG/CR-7267 75th percentile value Direct Ingestion (h-1)
B All ROCs 4.91E-7 NUREG/CR6755 Removable Fraction P
All ROCs 0.1 NUREG/CR-6755
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 10 of 24 Table 3. RESRAD-BUILD Input Values for Development of Building Surface DCGL Values (Building Occupancy Scenario)
Parameter Typea Nuclide Value/Distribution Value Reference Source Time for Source Removal (d)
P Am-241, Cm-243, Cm-244, Eu-154, H-3, Nb-94, Ni-63, Np-237, Pu-238, Pu-239, Pu-240, Pu-241, Sr-90, Tc-99 Eu-152, Fe-55 C-14, Co-60, Cs-137, Mn-54, Sb-125 1.8E+04 3.3E+04 5.3E+04 25th percentile value 50th percentile value 75Th percentile value Radionuclide Concentration (pCi/m2)
P All ROCs 1.0 Source 5: Wall 4 Type P
All ROCs area NUREG/CR-5512 Direction P
All ROCs X
NUREG/CR-5512 Location of Center of Source: x,y,z (m)
P All ROCs 7.5, 3.75, 1.5 Center of floor based on dimensions for median room size Source length Y-axis (m)
P All ROCs 7.5 Based on area dimensions median room size Source length Z-axis (m)
P All ROCs 3
Conservative representative wall height Area (m2)
P All ROCs Source length inputs used Air Release Fraction B
H-3 All others 1.0 5.2E-01 NUREG/CR-7267 75th percentile value Direct Ingestion (h-1)
B All ROCs 4.91E-7 NUREG/CR6755 Removable Fraction P
All ROCs 0.1 NUREG/CR-6755 Time for Source Removal (d)
P Am-241, Cm-243, Cm-244, H-3, Nb-94, Ni-63, Np-237, Pu-238, Pu-239, Pu-240, Pu-241, Sr-90, Tc-99 Eu-154 C-14, Co-60, Cs-137, Eu-152, Fe-55, Mn-54, Sb-125 1.8E+04 3.3E+04 5.3E+04 25th percentile value 50th percentile value 75Th percentile value Radionuclide Concentration (pCi/m2)
P All ROCs 1.0 Source 6: Ceiling Type P
All ROCs area NUREG/CR-5512
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 11 of 24 Table 3. RESRAD-BUILD Input Values for Development of Building Surface DCGL Values (Building Occupancy Scenario)
Parameter Typea Nuclide Value/Distribution Value Reference Source Direction P
All ROCs Z
NUREG/CR-5512 Location of Center of Source: x,y,z (m)
P All ROCs 3.75, 3.75, 3 Center of floor based on dimensions for median room size Source length X-axis (m)
P All ROCs 7.5 Based on area dimensions median room size Source length Y-axis (m)
P All ROCs 7.5 Based on area dimensions median room size Area (m2)
P All ROCs Source length inputs used Air Release Fraction B
H-3 All other ROCs 1.0 5.2E-01 NUREG/CR-7267 75th percentile value Direct Ingestion (h-1)
B All ROCs 4.91E-7 NUREG/CR6755 Removable Fraction P
All ROCs 0.1 NUREG/CR-6755 Time for Source Removal (d)
P Am-241, Cm-243, Cm-244, H-3, Ni-63, Np-237, Pu-238, Pu-239, Pu-240, Pu-241, Sr-90, Tc-99 Fe-55, Nb-94 C-14, Co-60, Cs-137, Eu-152, Eu-154, Mn-54, Nb-94, Sb-125 1.8E+04 3.3E+04 5.3E+04 25th percentile value 50th percentile value 75Th percentile value Radionuclide Concentration (pCi/m2)
P All ROCs 1.0
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 12 of 24 4 Calculations and Results Location of the center of the source: The center of each source was determined based on the dimensions of the floor, walls, and ceiling. The locations were determined as the mid-point of the dimension values for the X, Y, and Z axes.
Source No. 1 - floor: X-axis = 3.75, Y-axis = 3.75, Z-axis = 0.0 Source No. 2 - wall 1: X-axis = 3.75, Y-axis = 0.0, Z-axis = 1.5 Source No. 3 - wall 2: X-axis = 0.0, Y-axis = 3.75, Z-axis = 1.5 Source No. 4 - wall 3: X-axis = 3.75, Y-axis = 7.5, Z-axis = 1.5 Source No. 5 - wall 4: X-axis = 7.5, Y-axis = 3.75, Z-axis = 1.5 Source No. 6 - ceiling: X-axis = 3.75, Y-axis = 3.75, Z-axis = 3.0 RESRAD-Build was initially executed assuming 2 time periods (t=0y and t=1y) for each ROC. For several ROCs, RESRAD-Build results showed a higher dose in the 2nd time interval. Additional periods were evaluated for those ROCs to determine an approximate time of peak dose to increase conservatism in the DCGL values. RESRAD-Build results at the various time intervals are summarized in Table 4.
The peak dose values (shown in bold font in Table 4) were used as the radionuclide-specific CF with units of mrem/y per pCi/m2 for developing the DCGL values (listed in Table 5). DCGL values corresponding to the 25 mrem/y radiological criterion were calculated as follows:
(25 mrem/y)/radionuclide-specific CF (mrem/y per pCi/m2) = DCGL25 (pCi/m2)
The resulting DCGL25 values are shown in column 3 of Table 5.
Column 4 of Table 5 presents the unit conversions of the DCGL25 values to values with units of dpm/100cm2.
DCGL25 (pCi/m2)
- 2.22 dpm/1 pCi
- 1 m2/10000 cm2
- 100 = DCGL25 (dpm/100 cm2)
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 13 of 24 Table 4. Summary of RESRAD-Build Results by ROC ROC Dose (mrem) at evaluation time:
0y 1y 5y 10y 25y 50y Am-241 9.44E-04 9.51E-04 9.56E-04 9.50E-04 9.27E-04 1.42E-05 C-14 1.41E-07 1.41E-07 1.43E-07 1.44E-07 1.49E-07 1.55E-07 Cm-243 6.45E-04 6.36E-04 Cm-244 5.15E-04 5.00E-04 Co-60 4.08E-05 3.58E-05 Cs-137 1.30E-05 1.27E-05 Eu-152 1.95E-05 1.85E-05 Eu-154 2.12E-05 1.96E-05 Fe-55 4.71E-08 3.65E-08 H-3 9.32E-11 1.52E-10 3.21E-10 4.20E-10 3.85E-10 1.51E-10 Mn-54 9.98E-06 4.44E-06 Nb-94 2.80E-05 2.80E-05 2.79E-05 2.78E-05 2.76E-05 2.64E-05 Ni-63 1.16E-07 1.15E-07 Np-237 1.16E-03 1.17E-03 1.18E-03 1.18E-03 1.18E-03 2.19E-05 Pu-238 8.27E-04 8.28E-04 8.12E-04 7.82E-04 6.94E-04 8.77E-06 Pu-239 9.17E-04 9.25E-04 9.36E-04 9.37E-04 9.37E-04 1.47E-05 Pu-240 9.17E-04 9.25E-04 9.35E-04 9.36E-04 9.35E-04 1.44E-05 Pu-241 1.80E-05 1.88E-05 2.13E-05 2.36E-05 2.75E-05 4.62E-07 Sb-125 7.06E-06 5.55E-06 Sr-90 3.04E-05 2.97E-05 Tc-99 2.92E-07 2.93E-07 2.96E-07 3.00E-07 3.11E-07 3.22E-08
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 14 of 24 Table 5. Radionuclide-Specific DCGL Values ROC CF (mrem/y per 1pCi/m2)
DCGL25 pCi/m2 DCGL25 dpm/100cm2 Am-241 9.56E-04 2.62E+04 5.81E+02 C-14 1.55E-07 1.61E+08 3.58E+06 Cm-243 6.45E-04 3.88E+04 8.60E+02 Cm-244 5.15E-04 4.85E+04 1.08E+03 Co-60 4.08E-05 6.13E+05 1.36E+04 Cs-137 1.30E-05 1.92E+06 4.27E+04 Eu-152 1.95E-05 1.28E+06 2.85E+04 Eu-154 2.12E-05 1.18E+06 2.62E+04 Fe-55 4.71E-08 5.31E+08 1.18E+07 H-3 4.20E-10 5.95E+10 1.32E+09 Mn-54 9.98E-06 2.51E+06 5.56E+04 Nb-94 2.80E-05 8.93E+05 1.98E+04 Ni-63 1.16E-07 2.16E+08 4.78E+06 Np-237 1.18E-03 2.12E+04 4.70E+02 Pu-238 8.28E-04 3.02E+04 6.70E+02 Pu-239 9.37E-04 2.67E+04 5.92E+02 Pu-240 9.36E-04 2.67E+04 5.93E+02 Pu-241 2.75E-05 9.09E+05 2.02E+04 Sb-125 7.06E-06 3.54E+06 7.86E+04 Sr-90 3.04E-05 8.22E+05 1.83E+04 Tc-99 3.11E-07 8.04E+07 1.78E+06 5 References
- 1. ENG-OCS-002, RESRAD-Build Input Parameter Sensitivity Analysis - OCS, Rev 1, March 2024
- 2. NUREG/CR-5512, Volume 3, Residual Radioactive Contamination from Decommissioning:
Parameter Analysis, Draft Report for Comment, October 1999
- 3. NUREG/CR-6755, Technical Basis for Calculating Radiation Doses for the Building Occupancy Scenario Using the Probabilistic RESRAD-Build 3.0 Code, Feb. 2002
- 4. NUREG/CR-7267, Default Parameter Values and Distribution in RESRAD-ONSITE V7.2, RESRAD-BUILD V3.5, and RESRAD-OFFSITE V4.0 Computer Codes, February 2020
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 15 of 24 Appendix A Selected Pages from RESRAD-Build Reports
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 16 of 24 Am-241 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 13:03:00 Page: 7 **
Title : OCS DCGL_Am241 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_AM241.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 9.44E-04 9.44E-04 1.000000000 9.51E-04 9.51E-04 5.000000000 9.56E-04 9.56E-04 10.00000000 9.50E-04 9.50E-04 25.00000190 9.27E-04 9.27E-04 50.00000380 1.42E-05 1.42E-05 C-14 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/07/25 12:12:15 Page: 7 **
Title : OCS DCGL_C14 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_C14.bld Temporal Summary
====================================
====================================
==
RESRAD-BUILD Temporal Dose Tables
==
====================================
====================================
Dose to Receptor over the Exposure Duration
====================================
(mrem)
Evaluation Time Receptor Total years 1 0.000000000 1.41E-07 1.41E-07 1.000000000 1.41E-07 1.41E-07 5.000000000 1.43E-07 1.43E-07 10.00000000 1.44E-07 1.44E-07 25.00000190 1.49E-07 1.49E-07 50.00000380 1.55E-07 1.55E-07 Cm-243 Results
- RESRAD-BUILD Dose Program Output, Version 4.0 02/03/25 13:10:10 Page: 7 **
Title : OCS DCGL_Cm243 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Cm243.bld Temporal Summary
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 17 of 24 RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 6.45E-04 6.45E-04 1.000000000 6.36E-04 6.36E-04 Cm-244 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/03/25 13:23:30 Page: 7 **
Title : OCS DCGL_Cm244 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Cm244.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 5.15E-04 5.15E-04 1.000000000 5.00E-04 5.00E-04 Co-60 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 13:13:14 Page: 7 **
Title : OCS DCGL_Co60 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Co60.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 4.08E-05 4.08E-05 1.000000000 3.58E-05 3.58E-05
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 18 of 24 Cs-137 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 13:18:40 Page: 7 **
Title : OCS DCGL_Cs137 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Cs137.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 1.30E-05 1.30E-05 1.000000000 1.27E-05 1.27E-05 Eu-152 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/03/25 14:25:48 Page: 7 **
Title : OCS DCGL_Eu152 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Eu152.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 1.95E-05 1.95E-05 1.000000000 1.85E-05 1.85E-05 Eu-154 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/03/25 14:37:16 Page: 7 **
Title : OCS DCGL_Eu154 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Eu154.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 19 of 24 Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 2.12E-05 2.12E-05 1.000000000 1.96E-05 1.96E-05 Fe-55 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/03/25 15:42:30 Page: 7 **
Title : OCS DCGL_Fe55 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Fe55.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 4.71E-08 4.71E-08 1.000000000 3.65E-08 3.65E-08 H-3 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/07/25 12:03:46 Page: 7 **
Title : OCS DCGL_H3 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_H3.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 9.32E-11 9.32E-11 1.000000000 1.52E-10 1.52E-10 5.000000000 3.21E-10 3.21E-10 10.00000000 4.20E-10 4.20E-10 25.00000190 3.85E-10 3.85E-10 50.00000380 1.51E-10 1.51E-10
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 20 of 24 Mn-54 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/03/25 16:10:24 Page: 7 **
Title : OCS DCGL_Mn54 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Mn54.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 9.98E-06 9.98E-06 1.000000000 4.44E-06 4.44E-06 Nb-94 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/07/25 12:20:23 Page: 7 **
Title : OCS DCGL_Nb94 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Nb94.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 2.80E-05 2.80E-05 1.000000000 2.80E-05 2.80E-05 5.000000000 2.79E-05 2.79E-05 10.00000000 2.78E-05 2.78E-05 25.00000190 2.76E-05 2.76E-05 50.00000380 2.64E-05 2.64E-05 Ni-63 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/03/25 16:29:15 Page: 7 **
Title : OCS DCGL_Ni63 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Ni63.bld Temporal Summary
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 21 of 24 RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 1.16E-07 1.16E-07 1.000000000 1.15E-07 1.15E-07 Np-237 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 13:40:50 Page: 7 **
Title : OCS DCGL_Np237 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Np237.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 1.16E-03 1.16E-03 1.000000000 1.17E-03 1.17E-03 5.000000000 1.18E-03 1.18E-03 10.00000000 1.18E-03 1.18E-03 25.00000190 1.18E-03 1.18E-03 50.00000380 2.19E-05 2.19E-05 Pu-238 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 13:50:59 Page: 7 **
Title : OCS DCGL_Pu238 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Pu238.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 22 of 24 Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 8.27E-04 8.27E-04 1.000000000 8.28E-04 8.28E-04 5.000000000 8.12E-04 8.12E-04 10.00000000 7.82E-04 7.82E-04 25.00000190 6.94E-04 6.94E-04 50.00000380 8.77E-06 8.77E-06 Pu-239 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 14:13:07 Page: 7 **
Title : OCS DCGL_Pu239 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Pu239.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 9.17E-04 9.17E-04 1.000000000 9.25E-04 9.25E-04 5.000000000 9.36E-04 9.36E-04 10.00000000 9.37E-04 9.37E-04 25.00000190 9.37E-04 9.37E-04 50.00000380 1.47E-05 1.47E-05 Pu-240 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 14:28:35 Page: 7 **
Title : OCS DCGL_Pu240 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Pu240.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 23 of 24 (mrem)
Evaluation Time Receptor Total years 1 0.000000000 9.17E-04 9.17E-04 1.000000000 9.25E-04 9.25E-04 5.000000000 9.35E-04 9.35E-04 10.00000000 9.36E-04 9.36E-04 25.00000190 9.35E-04 9.35E-04 50.00000380 1.44E-05 1.44E-05 Pu-241 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 08:54:38 Page: 7 **
Title : OCS DCGL_Pu241 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Pu241.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 1.80E-05 1.80E-05 1.000000000 1.88E-05 1.88E-05 5.000000000 2.13E-05 2.13E-05 10.00000000 2.36E-05 2.36E-05 25.00000190 2.75E-05 2.75E-05 50.00000380 4.62E-07 4.62E-07 Sb-125 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 12:11:56 Page: 7 **
Title : OCS DCGL_Sb125 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Sb125.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 7.06E-06 7.06E-06 1.000000000 5.55E-06 5.55E-06
Building Surface DCGL Values - Oyster Creek RSCS TSD 25-015 Revision 0 Page 24 of 24 Sr-90 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 12:44:01 Page: 7 **
Title : OCS DCGL_Sr90 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Sr90.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 3.04E-05 3.04E-05 1.000000000 2.97E-05 2.97E-05 Tc-99 Results:
- RESRAD-BUILD Dose Program Output, Version 4.0 02/04/25 14:40:33 Page: 7 **
Title : OCS DCGL_Tc99 Input File : C:\\RESRAD_Family\\BUILD\\4.0\\UserFiles\\OCS_DCGL_Tc99.bld Temporal Summary RESRAD-BUILD Temporal Dose Tables Dose to Receptor over the Exposure Duration (mrem)
Evaluation Time Receptor Total years 1 0.000000000 2.92E-07 2.92E-07 1.000000000 2.93E-07 2.93E-07 5.000000000 2.96E-07 2.96E-07 10.00000000 3.00E-07 3.00E-07 25.00000190 3.11E-07 3.11E-07 50.00000380 3.22E-08 3.22E-08