ML25345A113

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Calculation ENG-OCS-006, Rev. 1, Area Factors for Use with Oyster Creek Dcgl Values for Buildings/Structures
ML25345A113
Person / Time
Site: Oyster Creek
Issue date: 12/11/2025
From:
Holtec Decommissioning International
To:
Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
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ML25345A092 List: ... further results
References
HDI 25-039 ENG-OCS-006, Rev 1
Download: ML25345A113 (0)
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BHI ENERGY ENGINEERING CALCULATION Area Factors for Use with Oyster Creek DCGL Values for Buildings/Structures ENG-OCS-006 Revision: 1 April 14, 2022 Prepared by:

BHI Energy l Power Services 97 Libbey Industrial Pkwy Weymouth, MA Prepared by Approved by

BHI Engineering ENG-OCS-006 Area Factors for Use with OCS DCGL Values for Buildings/Structures Rev. 1 Page 1 of 6 1.0 PURPOSE The purpose of this calculation is to develop area factors (AFs) for use with derived concentration guideline levels (DCGL) values for assessing buildings and structures at the Oyster Creek Station (OCS) site.

2.0 APPLICABILITY This calculation applies only the development of AF values for use with DCGLs for structures at the OCS site.

3.0 REFERENCES

3.1 BHI Energy Engineering Procedure ENG-AP-02, Verification of Software Operability 3.2 Users Manual for RESRAD-Build Version 3.0, June 2003 (ANL/EAD/03-1) 3.3 ENG-OCS-002, RESRAD-Build Input Parameter Sensitivity Analysis - OCS 3.4 ENG-OCS-004, Oyster Creek Building Surface DCGL Values 3.5 Radionuclide Selection for DCGL Development-Oyster Creek Station Site Characterization Project, January 2022 4.0 DISCUSSION The operability of the RESRAD-Build code was verified on each computer used for code executions in accordance with BHI Energy Engineering procedure ENG-AP-02, Verification of Software Operability

[3.1]. The RESRAD-Build users manual [3.2] provided guidance for code operation.

RESRAD-Build 3.5 was used to perform a parameter sensitivity analysis [3.3] and to calculate building surface DCGL values [3.4]. To maintain consistency with the approached used in those calculations, RESRAD-Build 3.5 was also used in the development of AFs.

Except for the number of sources and source size, all input is the same as that used in the building structure DCGL calculations. However, only one source is modeled instead of the six sources considered in calculating the building structure DCGL values. The base case for AF values is a single area source (i.e.,

a 64 m2 floor). Five smaller area sources were assumed with the receptor located 1 meter away from the source midpoint: 50 m2, 10 m2, 5 m2, 2.5 m2, and 1 m2.

AF values for the buildings/structures were calculated in a 2-step process. First, the total doses from all pathways for each ROC for a base case and the assumed reduced sizes of contaminated areas were calculate using RESRAD-Build 3.5. Then, the AF values are determined from the ratio of the dose for the base case to the dose for each assumed smaller contaminated area.

5.0 ASSUMPTIONS and INPUT 5.1 Assumptions 5.1.1 Except for the number of sources and area size input, all assumptions regarding input parameters and active exposure pathways are the same as those used in the DCGL calculations.

5.1.2 Area sizes assumed in this calculation are 64 m2 (base case), 50 m2, 10 m2, 5 m2, 2.5 m2, and 1 m2.

5.1.3 The receptor dose point is assumed at 1m away from the center of the various area sources Input 5.2 Input

BHI Engineering ENG-OCS-006 Area Factors for Use with OCS DCGL Values for Buildings/Structures Rev. 1 Page 2 of 6 5.2.1 The ROCs identified for the OCS site [3.5] are shown in Table 1 below. RESRAD-Build 3.5 automatically accounts for progeny radionuclides with input for several of the ROCs (also shown in Table 1).

Table 1: Radionuclides-of-Concern for the OCS Site ROCa Progenyb ROCa Progenyb Am-241 Np-237, Th-229, U-233 Nb-94 C-14 Ni-63 Cm-243 Ac-227, Am-243, Pa-231, Pu-239, U-235 Np-237 Th-229, U-233 Cm-244 Pu-240, Ra-228, Th-228, Th-232, U-236 Pu-238 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 a ROC = radionuclide-of-concern identified for the OCS site.

b Included automatically with input of parent ROC 5.2.2 The source dimensions for the X-and Y-axes for the base case and smaller areas are assumed equal to the square root of the size of the area source.

Area Source (m2)

Length of X-and Y-axes (m) 64 8.00 50 7.07 10 3.16 5.0 2.24 2.5 1.58 1.0 1.00 5.2.3 Table 2 provides the input values for all other RESRAD-Build 3.5 parameters.

6.0 RESULTS 6.1 Table 3 summarizes the RESRAD-Build dose results for the various area sizes by ROC.

6.2 Table 4 shows the AF values for each area size by ROC. The AF values were calculated as follows:

AF = dose64/dosei where, dose64 = dose associated with 64 m2, and dosei = dose associated with area size of interest where i = 50m2, 10m2, 5m2, 2.5m2, and 1m2.

BHI Engineering ENG-OCS-006 Area Factors for Use with OCS DCGL Values for Buildings/Structures Rev. 1 Page 3 of 6 Table 2: RESRAD-Build 3.5 Input Parameter Values for AFs Parameter Nuclide Value/Distribution Value Reference Source Exposure Duration (d)

All ROCs 365.25 NUREG/CR-5512; NUREG/CR-7267 Indoor Fraction All ROCs 0.267 NUREG/CR-5512; NUREG/CR-7267 Evaluation Time (y)

All ROCs 1

T=1 corresponds to dose over the 1st year Number of Rooms All ROCs 1

NUREG/CR-5512 building occupancy scenario assumption Deposition Velocity (m/s)

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)

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)

All ROCs 8.41E-01 25th percentile value Room Area (m2)

All ROCs 64 NURGEG/CR-6755 Room Height (m)

All ROCs 3

NURGEG/CR-6755 Time Fraction All ROCs 1

NUREG/CR-7267 Inhalation Rate (m3/d)

All ROCs 33.6 NUREG/CR-5512, vol. 3 Indirect Ingestion Rate (m2/h)

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 All ROCs 4, 4,1 NUREG/CR-5512; center of room based on scenario room dimensions from NUREG/CR-5512 and NUREG/CR-7267 Shielding Thickness (cm)

All ROCs 0

no shielding Shielding Density (g/cm3)

All ROCs 1

Input value required for code execution - input has no impact due to shield thickness input Shielding Material All ROCs water Input value required for code execution - input has no impact due to shield thickness input Number of Sources All ROCs 1

64 m2 floor defined by the scenario (NUREG/CR-5512)

External Dose Conversion Factor, (mrem/y per pCi/cm2)

All ROCs RESRAD-Build library Values were from Federal Guidance Report No.12 (FGR-12).

BHI Engineering ENG-OCS-006 Area Factors for Use with OCS DCGL Values for Buildings/Structures Rev. 1 Page 4 of 6 Table 2: RESRAD-Build 3.5 Input Parameter Values for AFs Parameter Nuclide Value/Distribution Value Reference Source Air Submersion Dose Conversion Factor, (mrem/y per pCi/m3)

All ROCs RESRAD-Build library Values were from Federal Guidance Report No.12 (FGR-12).

Inhalation Dose Conversion Factor, (mrem/pCi)

All ROCs RESRAD-Build library Values were from Federal Guidance Report No.11 (FGR-11).

Ingestionl Dose Conversion Factor, (mrem/pCi)

All ROCs RESRAD-Build library Values were from Federal Guidance Report No.11 (FGR-11).

Source 1 Type All ROCs area NUREG/CR-5512 Direction All ROCs Z

NUREG/CR-5512 Location of Center of Source:

x,y,z (m)

All ROCs 4, 4, 0 Center of floor based on dimensions for defined room Source length X-axis (m)

All ROCs Variable Input provided in step 5.2.1 Source length Y-axis (m)

All ROCs Variable Input provided in step 5.2.1 Area (m2)

All ROCs Source length input used Air Release Fraction H-3 All others 1.0 5.2E-01 NUREG/CR-7267 75th percentile value Direct Ingestion (h-1)

All ROCs 4.91E-7 NUREG/CR6755 Removable Fraction All ROCs 0.1 NUREG/CR-5512 and NUREG/CR-6755 Time for Source Removal (d)

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)

All ROCs 1.0

BHI Engineering ENG-OCS-006 Area Factors for Use with OCS DCGL Values for Buildings/Structures Rev. 1 Page 5 of 6 Table 3: RESRAD-Build 3.5 Dose Results Area (m2)

Annual Dose (mrem) from 1 pCi/m2:

Am-241 C-14 Cm-243 Cm-244 Co-60 Cs-137 Eu-152 Eu-154 Fe-55 H-3 Mn-54 64 9.64E-05 2.48E-08 6.65E-05 5.23E-05 1.98E-05 5.40E-06 9.88E-06 1.05E-05 4.06E-09 7.54E-10 5.05E-06 50 7.54E-05 1.94E-08 5.21E-05 4.08E-05 1.82E-05 4.90E-06 9.07E-06 9.60E-06 3.17E-09 5.89E-10 4.64E-06 10 1.52E-05 3.92E-09 1.07E-05 8.16E-06 9.19E-06 2.38E-06 4.58E-06 4.85E-06 6.34E-10 1.18E-10 2.35E-06 5

7.65E-06 1.99E-09 5.48E-06 4.10E-06 6.13E-06 1.58E-06 3.06E-06 3.23E-06 3.19E-10 5.91E-11 1.57E-06 2.5 3.82E-06 9.95E-10 2.77E-06 2.04E-06 3.76E-06 9.64E-07 1.87E-06 1.98E-06 1.58E-10 2.94E-11 9.63E-07 1

1.54E-06 4.01E-10 1.12E-06 8.18E-07 1.78E-06 4.55E-07 8.88E-07 9.40E-07 6.35E-11 1.18E-11 4.56E-07 Area (m2)

Annual Dose (mrem) from 1 pCi/m2:

Nb-94 Ni-63 Np-237 Pu-238 Pu-239 Pu-240 Pu-241 Sb-125 Sr-90 Tc-99 64 1.41E-05 9.74E-09 1.19E-04 8.43E-05 9.32E-05 9.31E-05 1.81E-06 3.57E-06 1.97E-06 3.16E-08 50 1.29E-05 7.61E-09 9.35E-05 6.58E-05 7.28E-05 7.27E-05 1.42E-06 3.28E-06 1.54E-06 2.48E-08 10 6.54E-06 1.52E-09 1.93E-05 1.32E-05 1.46E-05 1.45E-05 2.83E-07 1.66E-06 3.23E-07 5.15E-09 5

4.37E-06 7.64E-10 9.86E-06 6.61E-06 7.31E-06 7.30E-06 1.42E-07 1.11E-06 1.66E-07 2.64E-09 2.5 2.68E-06 3.80E-10 4.99E-06 3.29E-06 3.64E-06 3.63E-06 7.08E-08 6.78E-07 8.45E-08 1.34E-09 1

1.27E-06 1.52E-10 2.03E-06 1.32E-06 1.46E-06 1.46E-06 2.84E-08 3.21E-07 3.46E-08 5.47E-10

BHI Engineering ENG-OCS-006 Area Factors for Use with OCS DCGL Values for Buildings/Structures Rev. 1 Page 6 of 6 Table 3: Building Surface Area Factors by Radionuclide and Area Size Area (m2)

Area Factor Values:

Am-241 C-14 Cm-243 Cm-244 Co-60 Cs-137 Eu-152 Eu-154 Fe-55 H-3 Mn-54 64 1

1 1

1 1

1 1

1 1

1 1

50 1

1 1

1 1

1 1

1 1

1 1

10 6

6 6

6 2

2 2

2 6

6 2

5 13 12 12 13 3

3 3

3 13 13 3

2.5 25 25 24 26 5

6 5

5 26 26 5

1 63 62 59 64 11 12 11 11 64 64 11 Area (m2)

Area Factor Values:

Nb-94 Ni-63 Np-237 Pu-238 Pu-239 Pu-240 Pu-241 Sb-125 Sr-90 Tc-99 64 1

1 1

1 1

1 1

1 1

1 50 1

1 1

1 1

1 1

1 1

1 10 2

6 6

6 6

6 6

2 6

6 5

3 13 12 13 13 13 13 3

12 12 2.5 5

26 24 26 26 26 26 5

23 24 1

11 64 59 64 64 64 64 11 57 58

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