Text

TSD-14-011, Revision 0, Soil Area Factors
	ML15344A391
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	12/18/2014
From:	Decker R, Fauver D, Yetter R; ZionSolutions
To:	; Office of Nuclear Material Safety and Safeguards
Shared Package
ML15344A344	List: ML15344A342; ML15344A355; ML15344A356; ML15344A357; ML15344A358; ML15344A359; ML15344A361; ML15344A362; ML15344A363; ML15344A385; ML15344A386; ML15344A388; ML15344A389; ML15344A390; ML15344A391; ML15344A392; ML15344A393; ML15344A394; ML15344A413; ZS-2013-0082, NPDES Permit for Discharge; ZS-2015-0163, September 24, 2014 Email to Terry Sullivan;
References
	ZS-2015-0163 TSD-14-011, Rev. 0
	Download: ML15344A391 (75)
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Page 1 of 75 Technical Support Document TSD 14-011 Soil Area Factors Revision 0 Originator: (signature on file) Date: 12/16/14 Robert F. Decker Reviewer: (signature on file) Date: 12/16/14 Dave Fauver Approval: (signature on file) Date: 12/18/14 Robert F. Yetter

TSD 14-011 Revision 0 Page 2 of 75 Summary of Changes in this Revision:

Rev. 0 -Initial issuance.

TSD 14-011 Revision 0 Page 3 of 75 TABLE OF CONTENTS

1.

PURPOSE...................................................................................................................................... 4

2.

DISCUSSION................................................................................................................................ 4

3.

SURFACE AND SUBSURFACE AREA FACTORS.................................................................. 5

4.

CONCLUSION.............................................................................................................................. 6

5.

REFERENCES.............................................................................................................................. 7

6.

ATTACHMENTS.......................................................................................................................... 7 6.1. - RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area.......................................................................................... 8 6.2. - Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas........................................................... 28 6.3. - RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area.................................................................................. 42 6.4. - Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas..................................................... 62 LIST OF TABLES Table 1-Surface Soil Area Factors.......................................................................................................... 6 Table 2-Subsurface Soil Area Factors.................................................................................................... 6

Page 4 of 75

1.

PURPOSE The purpose of this technical support document (TSD) is to establish the soil area actors (AF) for surface and subsurface soils, and for use in other applications such as the Buried Piping dose assessment in TSD 14-015, Buried Piping Dose Modeling and Derived Concentrations Guideline Levels (Reference 1) for the Zion Station Restoration Project (ZSRP).

2.

DISCUSSION TSD 11-001, Potential Radionuclides of Concern During the Decommissioning of the Zion Station (Reference 2) and TSD-14-019, Radionuclides of Concern for Soil and Basement Fill Model Source Terms (Reference 3) evaluated Industry Guidance Documents, Zion characterization data select an initial suite of 26 radionuclides potentially present at the Zion Nuclear Power Station (ZNPS) at the time of license termination and the radionuclide mixture associated with the initial suite radionuclides. TSD 14-019 then evaluated the initial suite to determine which radionuclides were insignificant dose contributors in accordance with NUREG 1757, Volume 2, Revision 1, Consolidated Decommissioning Guidance Characterizations, Survey, and Determination of Radiological Criteria (Reference 4) guidance to determine the set of Radionuclides of Concern (ROC) that will be subject to detailed dose assessment. The five ROCs for soil are:

Co-60 Cs-134 Cs-137 Ni-63 Sr-90 The site-specific surface and subsurface soil DCGLs were determined in TSD 14-010, RESRAD Dose Assessment for Basement Fill Model and Soil (Reference 5) using the RESidual RADioactivity Materials Code 7.0 (RESRAD 7.0). The RESRAD input parameters for the soil DCGL calculations are provided in TSD 14-010, Attachment 9. Surface soil is defined as a 0.15 m contaminated zone thickness from the surface. Subsurface soil is defined as a 1.0 m contaminated zone thickness from the surface.

The RESRAD parameters used for the soil DCGL modeling are also used to determine AFs with two required modifications. First, the Contaminated fractions for plant food meat and milk were set to 1.0 for the soil DCGL modeling. This was required because the food ingestion rate parameters used represent the intakes for food grown onsite as opposed to national diet parameters. However, this parameter must be changed to -1 to allow RESRAD to adjust the food intake values in proportion to the contaminated area which ranges from 10,000 m2 to 0.01 m2 in the AF RESRAD runs. Changing the contaminated fractions parameter to -1 slightly lowers the base case value (i.e.,

that corresponding to the full 64,500 m2 area used in the soil DCGL modeling) due to RESRAD allowing a maximum of 50% for intake from the onsite garden. However, using this slightly lower value as the base case in the AF calculations is appropriate because the AFs are relative values and it is conservative because using the soil DCGL values as the base case would incorrectly result in higher calculated AFs. The second parameter modification required was the length parallel to aquifer flow which was adjusted for each contaminated area value used for AF determination. The length parallel to aquifer flow was calculated as the diameter of the assumed circular source area for each area modeled for AFs.

Soil DCGLs and Area Factors TSD 14-011 Revision 0 Page 5 of 75

3.

SURFACE AND SUBSURFACE AREA FACTORS For each radionuclide, all dose pathways were calculated assuming an initial concentration of 1 pCi/g. The RESRAD Default modeling for soil assumes a large source term area of 10,000 m2; ZSRP is assuming a much larger source term area of 64,500 m2. The ratio of the dose from the full source term area to the dose from a smaller area is defined as the AF. For the source term area of 64,500 m2, the AF for all radionuclides is equal to one. Area Factors for other size areas were computed by taking the ratio of the dose per unit concentration calculated by RESRAD for the 64,500 m2 source term area for 0.01, 0.03, 0.1, 0.3, 1, 3, 10, 30, 100, 300, 1000, 3000 and 10000 m2.

Isolated areas of contamination that are smaller than 64,500 m2 will have a lower dose.

Area Factors are calculated using RESRAD for each ROC and for source area sizes ranging from 0.01 m2 up to the full 64,500 m2. The RESRAD Summary Reports and AF calculations are provided in Attachments 1 through 4.

The calculated AFs will be used to adjust soil DCGLW to estimate soil DCGLEMC and the minimum detectable concentration (MDC) and/or investigation level for scanning in Class 1 survey units.

Hence, Where, AFm = the magnitude by which the residual radioactivity in a small area of elevated activity can exceed the DCGLW while maintaining compliance with the release criterion (surface and subsurface DCGLs). The DCGLEMC is used to set investigation levels and multiple small areas of elevated activity require additional evaluation in accordance with the guidance and formulation found in Sections 5.5.2.6 and 8.5.2 of NUREG 1575 Rev.1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) (Reference 6).

The Surface Soil and Subsurface Soil Area Factors are listed in Tables 1 and 2. The RESRAD Runs for the 64,500 m2 surface areas for both surface and subsurface soils are provided as a complete run in Attachments 1 and 3, respectively. For the remaining RESRAD runs, since the only change was for the contamination area/zone and the length parallel to flow, only page 18 displaying the dose in mrem/yr is provided in Attachments 2 and 4, respectively. AFs for other areas are determined by linear interpolation using the AFs listed in Tables 1 and 2.

Soil DCGLs and Area Factors TSD 14-011 Revision 0 Page 6 of 75 Table 1-Surface Soil Area Factors Area (m2)

Area Factors for Radionuclides of Concern 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 0.1 1.50E+02 1.23E+02 1.33E+02 6.92E+04 8.52E+03 0.3 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 Table 2-Subsurface Soil Area Factors Area (m2)

Area Factors for Radionuclides of Concern Cs-137 Co-60 Cs-134 Ni-63 Sr-90 0.01 2.04E+03 1.10E+03 1.52E+03 5.16E+05 1.45E+05 0.03 6.80E+02 3.65E+02 5.08E+02 1.98E+05 4.95E+04 0.1 2.04E+02 1.10E+02 1.52E+02 6.30E+04 1.50E+04 0.3 6.80E+01 3.65E+01 5.08E+01 2.14E+04 5.01E+03 1

2.04E+01 1.10E+01 1.52E+01 6.49E+03 1.50E+03 3

9.26E+00 4.91E+00 6.92E+00 2.17E+03 5.23E+02 10 4.48E+00 2.36E+00 3.35E+00 6.51E+02 1.64E+02 30 3.23E+00 1.70E+00 2.42E+00 2.17E+02 5.72E+01 100 2.59E+00 1.37E+00 1.95E+00 6.51E+01 1.76E+01 300 2.29E+00 1.26E+00 1.77E+00 2.17E+01 5.92E+00 1,000 1.90E+00 1.16E+00 1.56E+00 6.52E+00 1.78E+00 3,000 1.72E+00 1.13E+00 1.46E+00 4.12E+00 1.65E+00 10,000 1.32E+00 1.07E+00 1.22E+00 1.80E+00 1.30E+00 64,500 1.00E+00 1.00E+00 1.00E+00 1.00E+00 1.00E+00

4.

CONCLUSION This TSD calculates surface and subsurface soil AFs for the ZNPS ROCs using RESRAD. The input parameters were the same as used to calculate soil DCGL with minor adjustments required to evaluates the smaller source areas. The resulting AFs are provided in Tables 1 and 2.

Soil DCGLs and Area Factors TSD 14-011 Revision 0 Page 7 of 75

5.

REFERENCES 5.1.

ZionSolutions Technical Support Document (TSD)14-015, Buried Piping Dose Modeling and Derived Concentration Guideline Levels - December 2014.

5.2.

ZionSolutions Technical Support Document (TSD)11-001, Potential Radionuclides of Concern During the Decommissioning of the Zion Station - October 2012.

5.3.

ZionSolutions Technical Support Document (TSD)14-019, Radionuclides of Concern for Soil and Basement Fill Model Source Terms - December 2014.

5.4.

NUREG-1757 Vol. 2, Rev. 1, Consolidated Decommissioning Guidance Characterizations, Survey, and Determiation of Radiological Criteria, September 2006.

5.5.

ZionSolutions Technical Support Document (TSD)14-010, RESRAD Dose Modeling for Basement Fill Model and Soil DCGL and Calculation of Basement Fill Model Dose Factors - December 2014.

5.6.

NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM).

6.

ATTACHMENTS 6.1. - RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area 6.2. - Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas 6.3. - RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area 6.4. - Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas

TSD 14-011 Revision 0 Page 8 of 75 ATTACHMENT 1 RESRAD Run for to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 9 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 10 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 11 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 12 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 13 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 14 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 15 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 16 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 17 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 18 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 19 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 20 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 21 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 22 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 23 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 24 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 25 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 26 of 75

- RESRAD Run to Determine Surface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 27 of 75

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TSD 14-011 Revision 0 Page 28 of 75 ATTACHMENT 2 Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 29 of 75 RESRAD Run Page 18 for 0.01 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 30 of 75 RESRAD Run Page 18 for 0.03 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 31 of 75 RESRAD Run Page 18 for 0.1 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 32 of 75 RESRAD Run Page 18 for 0.3 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 33 of 75 RESRAD Run Page 18 for 1.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 34 of 75 RESRAD Run Page 18 for 3.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 35 of 75 RESRAD Run Page 18 for 10.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 36 of 75 RESRAD Run Page 18 for 30.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 37 of 75 RESRAD Run Page 18 for 100.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 38 of 75 RESRAD Run Page 18 for 300.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 39 of 75 RESRAD Run Page 18 for 1,000.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 40 of 75 RESRAD Run Page 18 for 3,000.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 41 of 75 RESRAD Run Page 18 for 10,000.0 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Surface Soil Contamination Areas TSD 14-011 Revision 0 Page 42 of 75 ATTACHMENT 3 RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area

- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 43 of 75

- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 44 of 75

- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 45 of 75

- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 46 of 75

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- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 47 of 75

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- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 51 of 75

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- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 55 of 75

- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 56 of 75

- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 57 of 75

- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 58 of 75

- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 59 of 75

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- RESRAD Run to Determine Subsurface Soil Area Factors for 64,500 m2 Contamination Area TSD-14-011 Revision 0 Page 61 of 75

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 62 of 75 ATTACHMENT 4 Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 63 of 75 RESRAD Run Page 18 for 0.01 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 64 of 75 RESRAD Run Page 18 for 0.03 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 65 of 75 RESRAD Run Page 18 for 0.1 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 66 of 75 RESRAD Run Page 18 for 0.3 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 67 of 75 RESRAD Run Page 18 for 1 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 68 of 75 RESRAD Run Page 18 for 3 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 69 of 75 RESRAD Run Page 18 for 10 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 70 of 75 RESRAD Run Page 18 for 30 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 71 of 75 RESRAD Run Page 18 for 100 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 72 of 75 RESRAD Run Page 18 for 300 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 73 of 75 RESRAD Run Page 18 for 1000 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 74 of 75 RESRAD Run Page 18 for 3000 m2 Contamination Area

- Summary of RESRAD Runs Used to Determine Area Factors for Remaining Subsurface Soil Contamination Areas TSD 14-011 Revision 0 Page 75 of 75 RESRAD Run Page 18 for 10000 m2 Contamination Area

Page 1 of 75 Technical Support Document TSD 14-011 Soil Area Factors Revision 0 Originator: (signature on file) Date: 12/16/14 Robert F. Decker Reviewer: (signature on file) Date: 12/16/14 Dave Fauver Approval: (signature on file) Date: 12/18/14 Robert F. Yetter

TSD 14-011 Revision 0 Page 2 of 75 Summary of Changes in this Revision:

Rev. 0 -Initial issuance.