ML032310291

From kanterella
Jump to navigation Jump to search
Slides and Viewgraphs from Meeting Between NRC and Yankee Atomic Electric Co
ML032310291
Person / Time
Site: Yankee Rowe
Issue date: 08/13/2003
From:
Yankee Atomic Electric Co
To:
NRC/FSME
References
-RFPFR
Download: ML032310291 (10)
v • d • e


Text

Agenda August 13, 2003 Meeting with NRC Topic: Dose Modeling Meeting Goals:

1. Obtain feedback on Staff review of Soil DCGL Calculation and establish mechanism for a response process
2. Apprise Staff on development of dose modeling approach for Building Occupancy and Concrete scenarios Meeting Topics:
1. Approach to Derive Soil DCGL Values I Impact on Sensitivity Analysis for BO and Concrete
1. Summary of approach to derive Soil DCGL values using Peak of the Mean Dose
2. Results of Resident Farmer Scenario Runs a Nuclide specific PMD Conversion Factor for unit activity concentration of 1 pCi/gm
b. PMD precision in 3 repetitions
c. DCGL values
3. " Forward" run results using the DCGL value as the initial nuclide concentration
4. Requirement for Sensitivity Analysis for Building Occupancy and Concrete Scenarios I. Building Occupancy Scenario
1. Summary of Scenario and approach to derive Building Occupancy DCGL values
2. Results of Building Occupancy Runs
a. Determination of the year in which maximum dose occurs
b. Nuclide specific "analogous" PMD Conversion Factor and Standard Deviation for unit activity concentration of I pCi/M 2
c. DCGL values 3 " Forward" run results using the DCGL value as the initial nuclide concentration 111.Subsurface Concrete
1. Preliminary Outline of Scenario including:
a. Modified Resident Farmer Scenario using external exposure and water dependent pathways
b. Contaminated Zone Area
c. Well location and water model
d. Kd
2. Soil "Forward" runs have confirmed DCGL derived in this manner will not exceed dose limit, therefore will not be repeated for RESRAD Concrete runs IV. Area Factor Calculations
1. Will use probabilistic modules of codes
2. Reduce Time Integrations to improve run times
3. Effect of Time Integration reduction on Dose V. Address Questions on Soil Calculations

Yankee Atomic Electric Company LTP Dose Modeling Page Figure 1 Approach to DCGL using the Peak of the Mean Dose

Yankee Atomic Electric Company LTP Dose Modeling Page 2 RESRAD Resident Farmer Scenario Results Soil Peak of the Mean Dose per unit pCi/gm Radionuclide Peak of the Mean Dose' Peak of the Mean Dose* Peak of the Mean Dose* % precision Repetition 1 Repetition 2 Repetition 3 among Repetitions H-3 2.932E-02 2.913E-02 2.947E-02 0.58 C-14 2.229E+00 2.219E+00 2.227E+00 0.24 Mn-54 1.1 53E+00 1.154E+00 1.156E+00 0.13 Fe-55 6.907E-04 6.923E-04 6.904E-04 0.15 Ni-59 6.010E-03 6.023E-03 6.550E-03 4.97 1000 obs. 6.222E-03 6.239E-03 6.267E-03 0.36 Ni-63 1.645E-02 1.649E-02 1.793E-02 4.95 1000 obs. 1.703E-02 1.708E-02 1.716E-02 0.38 Co-60 5.172E+00 5.154E+00 5.167E+00 0.18 Sr-90 9.270E+00 9.330E+00 9.653E+00 2.19 Nb-94 2.927E+00 2.931 E+00 2.930E+00 0.07 TC-99 9.883E-01 9.891E-01 1.027E+00 2.21 Ru-106 3.665E-01 3.668E-01 3.655E-01 0.19 Ag-1 08m 2.934E+00 2.932E+00 2.934E+00 0.04 Sb-125 6.619E-01 6.627E-01 6.626E-01 0.07 Cs-134 3.751 E+00 3.688E+00 3.728E+00 0.86 Cs-1 37 2.042E+00 2.037E+00 2.052E+00 0.37 Eu-1 52 2.073E+00 2.074E+00 2.073E+00 0.03 Eu-1 54 2.246E+00 2.247E+00 2.248E+00 0.04 Eu-1 55 5.348E-02 5.353E-02 5.354E-02 0.06 Pu-238 4.714E-01 4.952E-01 4.839E-01 2.46 Pu-239 5.462E-01 5.445E-01 5.275E-01 1.92 Pu-241 1.578E-02 1.581 E-02 1.624E-02 1.61 Am-241 5.637E-01 5.639E-01 5.496E-01 1.47 Cm-243 5.493E-01 5.445E-01 5.582E-01 1.26

  • Unit in mrem/yr per pCi/gm

Yankee Atomic Electric Company LTP Dose Modeling Page 3 RESRAD Resident Farmer Scenario Results Median Peak of the Mean Dose and Calculated DCGL Nuclide Median DCF DCGL mremlyr per pCi/gm pCi/gm H-3 2.932E-02 8.527E+02 C-14 2.227E+00 1.123E+01 Mn-54 1.154E+00 2.166E+01 Fe-55 6.907E-04 3.620E+04 Ni-59 6.239E-03 4.007E+03 Ni-63 1.708E-02 1.464E+03 Co-60 5.167E+00 4.838E+00 Sr-90 9.330E+00 2.680E+00 Nb-94 2.930E+00 8.532E+00 Tc-99 9.891 E-01 2.528E+01 Ru-106 3.665E-01 6.821 E+01 Ag-108m 2.934E+00 8.521 E+00 Sb-125 6.626E-01 3.773E+01 Cs-134 3.728E+oo 6.706E+00 Cs-137 2.042E+00 1.224E+01 Eu-152 2.073E+00 1.206E+01 Eu-154 2.247E+00 1.113E+01 Eu-155 5.353E-02 4.670E+02 Pu-238 4.839E-01 5.166E+01 Pu-239 5.445E-01 4.591E+01 Pu-241 1.581 E-02 1.581 E+03 Am-241 5.637E-01 4.435E+01 Cm-243 5.493E-01 4.551 E+01

Yankee Atomic Electric Company LTP Dose Modeling Page 4 RESRAD Resident Farmer Scenario Results Soil DCGL values and DCGL Dose Verification Results Nuclide Median DCF DCGL DCGL mrem/yr per pCi/gm pCi/gm Dose Calculation rnrernlyr H-3 2.932E-02 8.527E+02 25.00 24.84 25.13 C-14 2.227E+00 1.123E+01 25.03 24.91

___________ ~~~~~~~~~~25.01 Mn-54 1.154E+00 2.166E+01 24.97 24.99 25.03 Fe-55 6.907E-04 3.620E+04 25.00 25.06 24.99

]Ni-59 6.239E03 4.007E+03 24.93 25.00 25.11 Ni-63 1.708E-02 1.464E+03 24.94 25.01

__________ ~~~~~~~~~25.12 Co-60 5.167E+00 4.838E+00 25.02 24.94

_________________ ~~~25.00 Sr90 9.330E+00 2.680E+00 24.84 25.01 25.87 Nb-94 2.930E+00 8.532E+00 24.97 25.01 25.00 Tc-99 9.891 E-01 2.528E+01 24.98 25.00

_ _ __ __ __ _ _ _ __ _ _ _ __ _ _ __ _ _ _ _ _2 5 .9 6 Ru-i106 3.665E-01 6.821E+01 25.00 25.02 24.93 Ag-108m 2.934E+00 8.521 E+00 25.00 24.98 25.00 Sb-125 6.626E-01 3.773E+01 24.97 25.01

__________ ~~~~~~~~~25.00 Cs-134 3.728E+oo 6.706E+00 25.16 24.73

__ __ __ _ _ _ _ _ _ _ __ _ _ _ _ _ _ __ _ __ __ __ _ _ _ _2 5 .0 0

Yankee Atomic Electric Company LTP Dose Modeling Page 5 RESRAD Resident Farmer Scenario Results Soil DCGL values and DCGL Dose Verification Results Nuclide Median DCF DCGL DCGL mremlyr per pCi/gm Dose Calculation pCi/gm mrem/yr Cs-137 2.042E+00 1.224E+01 25.00 24.94 25.12 Eu-152 2.073E+00 1.206E+01 25.00 25.01

___________ ~~~~~ ~~~~25.00 Eu-154 2.247E+00 1.113E+01 25.00 25.01

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ~25.0 2 Eu- 155 5.353E-02 4.670E+02 24.98 25.00

_ _ _ _ _ _ _ _ _ _ _ ~~~~.0~~~~~25 0

Pu-238 4.839E-01 5.166E+01 24.35 25.58

____________ ~~~~~ ~~~~25.00 Pu-239 5.445E-01 4.591 E+O1 25.08 25.00 24.22 Pu-241 1.581 E-02 1.581 E+03 24.95 25.00

___________ ~~~~~ ~~~~25.68 Am-241 5.637E-01 4.435E+01 25.00 25.01

__ _ __ __ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _2 4.38 Cm-243 5.493E-01 4.551 E+01 25.00 24.78

_ __ __ __ __ _ __ __ __ __ _ _ _ _ __ _ __ _ _ _ _ _ _ _ _ _ _2 5 .4 0

Yankee Atomic Electric Company LTP Dose Modeling Page 6 Building Occupancy Scenario Metabolic and Behavioral Parameter values obtained from NUREG-5512 vol3 and NUREG-6697.

Scenario defined:

1. Direct Ingestion:

Base on the methodology in NUREG-5512 using a default ingestion rate 1.1 E-4m2Ihr and dividing by the source area.

Physical Parameters Scenario defined:

1. Room Dimension:

An inventory of the rooms and partial rooms that would remain on site following the DEMCO demolition project was used as the starting point in determining room dimensions. Wall dimensions were determined from Site Drawings showing the building locations, building elevations and dimensions. Ceilings are not included in the model, as partial rooms/rooms remaining at the time of Final Status Survey (FSS) will either have no ceiling or will be covered with a ceiling constructed of new uncontaminated building materials.

Room area: 19.7 meters2 Room Height: 3.5 meters Sources: Floor and four wall Source area: Floor = 19.7 meters2 and Walls = 15.6 meters2

2. Source and Receptor location Receptor location is defined as the middle of the room at a height of 1 meter. Coordinates for the source centers are defined by the source areas listed above.

Physical Parameter assigned distributions from NUREG-6697:

1. Deposition Velocity
2. Resuspension Rate
3. Time for Source Removal Input correlations assigned between Deposition Velocity and Resuspension Rate, and between Sources for Time for Source Removal

Yankee Atomic Electric Company LTP Dose Modeling Page 7 RESRAD Build Building Occupancy Results Surface Area Mean Dose at Tmax and Building Area Surface DCGL Nuclide Mean DCF Std Dev. Relative DCGL DCGL (mrem / yr Inthe Mean Std (pCi I M2) (dpm /100 cm2) per DCF Dev.

pCi / m2)

H-3 8.07E-09 1.51E-14 < 0.01% 3.1OE+09 6.88E+07 C-14 2.69E-07 5.65E-12 < 0.01% 9.29E+07 2.06E+06 Mn-54 7.94E-06 1.17E-11 < 0.01% 3.15E+06 6.99E+04 Fe-55 6.89E-08 1.03E-12 < 0.01% 3.63E+08 8.06E+06 Ni-59 2.71 E-08 1.50E-13 < 0.01% 9.23E+08 2.05E+07 Ni-63 7.42E-08 7.39E-13 < 0.01% 3.37E+08 7.48E+06 Co-60 3.32E-05 7.41 E-11 < 0.01% 7.53E+05 1.67E+04 Sr-90 1.96E-05 2.36E-10 < 0.01% 1.28E+06 2.83E+04 Nb-94 2.21E-05 5.20E-11 < 0.01% 1.13E+06 2.51E+04 Tc-99 1.89E-07 2.92E-12 < 0.01% 1.32E+08 2.94E+06 Ru-106 4.67E-06 1.64E-11 < 0.01% 5.35E+06 1.19E+05 Ag-108m 2.30E-05 2.15E-11 < 0.01% 1.09E+06 2.41E+04 Sb-125 5.84E-06 1.70E-11 < 0.01% 4.28E+06 9.50E+04 Cs-134 2.58E-05 1.75E-10 < 0.01% 9.69E+05 2.15E+04 Cs-137 1.39E-05 1.58E-10 < 0.01% 1.80E+06 3.99E+04 Eu-152 1.58E-05 2.39E-11 < 0.01% 1.58E+06 3.51E+04 Eu-154 1.70E-05 1.81 E-11 < 0.01% 1.47E+06 3.26E+04 Eu-155 9.97E-07 4.60E-13 < 0.01% 2.51 E+07 5.57E+05 Pu-238 4.35E-04 5.39E-08 0.01% 5.75E+04 1.28E+03 Pu-239 4.82E-04 6.12E-08 0.01% 5.19E+04 1.15E+03 Pu-241 1.02E-05 2.31 E-09 0.02% 2.45E+06 5.44E+04 Am-241 4.96E-04 6.25E-08 0.01% 5.04E+04 1.12E+03 Cm-243 3.40E-04 3.87E-08 0.01% 7.35E+04 1.63E+03

Yankee Atomic Electric Company LTP Dose Modeling Page 8 RESRAD Build - Building Occupancy Results Surface Area Mean Dose at Tmax and Building Area Surface DCGL DCGL Mean DCGL Mean Nuclide pCi / m2 Dose from Nuclide pCi I m2 Dose from DCGL DCGL H-3 3.1OE+09 25.0 Ag-108m 1.09E+06 25.1 C-14 9.29E+07 24.9 Sb-125 4.28E+06 25.0 Mn-54 3.15E+06 25.0 Cs-1 34 9.69E+05 25.0 Fe-55 3.63E+08 25.0 Cs-137 1.80E+06 25.0 Ni-59 9.23E+08 25.0 Eu-152 1.58E+06 25.0 Ni-63 3.37E+08 25.0 Eu-154 1.47E+06 25.0 Co-60 7.53E+05 25.0 Eu-155 2.51E+07 25.0 Sr-90 1.28E+06 25.0 Pu-238 5.75E+04 25.0 Nb-94 1.13E+06 25.0 Pu-239 5.19E+04 25.0 Tc-99 1.32E+08 24.9 Pu-241 2.45E+06 24.9 Ru-106 5.35E+06 25.0 Am-241 5.04E+04 25.0 Cm-243 7.35E+04 25.0

Yankee Atomic Electric Company LTP Dose Modeling Page 9 Subsurface Concrete DCGL using RESRAD Resident Farmer Scenario

1. Consider intact concrete in contact with the water table
2. Modified Resident Farmer Scenario to consider the following pathways:
a. external exposure
b. water dependent pathways
3. Parameter Considerations:
a. Concrete (Contaminated Zone Area) area and thickness determined by reviewing concrete structures to remain after demolition and site grading and also which of those structures are in contact with the water table.

Area: - 450m2 Thickness: 0.3m - 2 m

b. Kd value options: Kd values from CY Kd analysis and soil Kd distributions from NUREG 6697.

We will also be considering the results of a literature study on Kd in concrete to be conducted by BNL.

c. Water Transport Model.
d. Contaminated zone parameters for concrete to be evaluated by team hydrogeologist/chemist
4. Peak of the Mean approach to derive DCGL values
5. Forward runs with DCGL values have been confirmed with the RESRAD soil scenario and will not be repeated for concrete runs Area Factor Calculations
1. Testing with RESRAD Build probabilistic code and Pu-241 indicates that a reduction in the Time Integrations (from the default value =17) will reduce run times and NOT effect the dose value at Tmax.

This will allow use of Building Occupancy results to develop Area Factor relationship. Assume same istrue RESRAD.

2. Plan to use the probabilistic code to develop nuclide specific Area Factors.
3. The number of observations and repetitions will not change from DCGL runs Questions on Soil Calculation
Retrieved from "https://kanterella.com/w/index.php?title=ML032310291&oldid=2647913"