ML16260A109

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Draft LOCA Dose Consequences Using AST Methods
ML16260A109
Person / Time
Site: Farley  Southern Nuclear icon.png
Issue date: 09/22/2016
From:
Southern Nuclear Operating Co
To:
Office of Nuclear Reactor Regulation
WILLIAMS S A, DORL/LPL2-1, 415-1009
Shared Package
ML16260A083 List:
References
NL-16-0388
Download: ML16260A109 (10)
v • d • e


Text

LOCA DOSE CONSEQUENCES USING AST METHODS Licensee Document Number: SM-1080538201

-003, Version 2 Method/Computer Program Used:

RADTRAD Version 3.10 Regulatory Guidance: RG-1.183, including Appendix A Model Discussion:

The calculation was performed in four parts , evaluating the contributions from four separate release paths: Containment mini

-purge, Containment Leakage, ECCS Leakage Outside of Containment, and potential leakage from the Refueling Water Storage Tank (RWST).

The dose contributions from each of these pathways were summed to obtain the doses to the Main Control Room (MCR), the Exclusion Area Boundary (EAB), and the Low Population Zone (LPZ).

The accident duration is 30 days, per FNP Current Licensing Basis (CLB). Results and Acceptance Limits: Release EAB (rem TEDE) LPZ (rem TEDE) Control Room (rem TEDE) Containment Purge 0.001 0.0004 0.002 Containment Leakage 12.9 5.6 3.6 ESF Leakage 0.25 0.23 0.81 RWST Back-leakage 0.13 0.13 0.26 Total 13.2 6.0 4.7 Acceptance Limit 25 25 5 (Note that rounding is applied to all values)

LOCA DOSE CONSEQUENCES USING AST METHODS Key Assumptions and Inputs:

Source Term Parameters Parameter Value Reactor Power Leve l: 2775 MWt (+2% uncertainty = 2831 MWt)

Reactor Peaking Factor: 1.7 Core Cycle

-to-Cycle Augments: Isotope Factor Kr-85 1.15 Xe-133 1.05 Xe-135 1.03 Cs-134 1.35 Cs-136 1.25 Cs-137 1.20 Halogens 1.03 Other Noble Gases 1.03 Other Particulates 1.03 LOCA DOSE CONSEQUENCES USING AST METHODS Core Source Term:

Nuclide Activity Core Adjusted Nuclide Activity Core Adjusted (Ci) Factor Activity (Ci) Factor Activity (Ci) (Ci) Co-58 0.00E+00 1.03 0.00E+00 Te-134 1.30E+08 1.03 1.34E+08 Co-60 0.00E+00 1.03 0.00E+00 I-130 2.50E+06 1.03 2.58E+06 Br-82 3.80E+05 1.03 3.91E+05 I-131 7.50E+07 1.03 7.73E+07 Br-83 9.70E+06 1.03 9.99E+06 I-132 1.10E+08 1.03 1.13E+08 Br-84 1.70E+07 1.03 1.75E+07 I-133 1.60E+08 1.03 1.65E+08 Kr-83m 9.70E+06 1.03 9.99E+06 I-134 1.70E+08 1.03 1.75E+08 Kr-85 7.20E+05 1.15 8.28E+05 I-135 1.50E+08 1.03 1.55E+08 Kr-85m 2.10E+07 1.03 2.16E+07 Xe-131m 8.40E+05 1.03 8.65E+05 Kr-87 4.00E+07 1.03 4.12E+07 Xe-133 1.50E+08 1.05 1.58E+08 Kr-88 5.70E+07 1.03 5.87E+07 Xe-133m 4.80E+06 1.03 4.94E+06 Rb-86 1.40E+05 1.03 1.44E+05 Xe-135 3.50E+07 1.03 3.61E+07 Rb-89 7.40E+07 1.03 7.62E+07 Xe-135m 3.00E+07 1.03 3.09E+07 Sr-89 7.70E+07 1.03 7.93E+07 Xe-138 1.30E+08 1.03 1.34E+08 Sr-90 5.70E+06 1.03 5.87E+06 Cs-134 1.10E+07 1.35 1.49E+07 Sr-91 9.50E+07 1.03 9.79E+07 Cs-134m 3.60E+06 1.03 3.71E+06 Sr-92 1.00E+08 1.03 1.03E+08 Cs-136 3.30E+06 1.25 4.13E+06 Y-90 5.90E+06 1.03 6.08E+06 Cs-137 7.60E+06 1.20 9.12E+06 Y-91 9.90E+07 1.03 1.02E+08 Cs-138 1.40E+08 1.03 1.44E+08 Y-91m 5.50E+07 1.03 5.67E+07 Ba-139 1.40E+08 1.03 1.44E+08 Y-92 1.00E+08 1.03 1.03E+08 Ba-140 1.30E+08 1.03 1.34E+08 Y-93 1.20E+08 1.03 1.24E+08 Ba-141 1.30E+08 1.03 1.34E+08 Y-95 1.30E+08 1.03 1.34E+08 La-140 1.40E+08 1.03 1.44E+08 Zr-95 1.30E+08 1.03 1.34E+08 La-141 1.30E+08 1.03 1.34E+08 Zr-97 1.30E+08 1.03 1.34E+08 La-143 1.20E+08 1.03 1.24E+08 Nb-95 1.30E+08 1.03 1.34E+08 La-142 1.20E+08 1.03 1.24E+08 Nb-95m 9.40E+05 1.03 9.68E+05 Ce-141 1.30E+08 1.03 1.34E+08 Nb-97 1.30E+08 1.03 1.34E+08 Ce-143 1.20E+08 1.03 1.24E+08 Mo-99 1.40E+08 1.03 1.44E+08 Ce-144 9.40E+07 1.03 9.68E+07 Tc-99m 1.20E+08 1.03 1.24E+08 Pr-143 1.20E+08 1.03 1.24E+08 Ru-103 1.10E+08 1.03 1.13E+08 Nd-147 5.10E+07 1.03 5.25E+07 Ru-105 7.60E+07 1.03 7.83E+07 Pm-147 9.70E+06 1.03 9.99E+06 LOCA DOSE CONSEQUENCES USING AST METHODS Nuclide Activity Core Adjusted Nuclide Activity Core Adjusted (Ci) Factor Activity (Ci) Factor Activity (Ci) (Ci) Ru-106 3.40E+07 1.03 3.50E+07 Pm-148 2.10E+07 1.03 2.16E+07 Rh-103m 1.00E+08 1.03 1.03E+08 Pm-148m 2.30E+06 1.03 2.37E+06 Rh-105 6.90E+07 1.03 7.11E+07 Pm-149 4.60E+07 1.03 4.74E+07 Pd-109 2.20E+07 1.03 2.27E+07 Pm-151 1.50E+07 1.03 1.55E+07 Sb-124 8.80E+04 1.03 9.06E+04 Sm-153 3.30E+07 1.03 3.40E+07 Sb-125 9.40E+05 1.03 9.68E+05 Eu-154 7.10E+05 1.03 7.31E+05 Sb-126 7.90E+04 1.03 8.14E+04 Eu-155 4.60E+05 1.03 4.74E+05 Sb-127 7.90E+06 1.03 8.14E+06 Eu-156 1.20E+07 1.03 1.24E+07 Sb-129 2.40E+07 1.03 2.47E+07 Np-238 2.30E+07 1.03 2.37E+07 Te-125m 2.00E+05 1.03 2.06E+05 Np-239 1.40E+09 1.03 1.44E+09 Te-127 7.80E+06 1.03 8.03E+06 Pu-238 1.60E+05 1.03 1.65E+05 Te-127m 1.00E+06 1.03 1.03E+06 Pu-239 2.20E+04 1.03 2.27E+04 Te-129 2.40E+07 1.03 2.47E+07 Pu-240 3.10E+04 1.03 3.19E+04 Te-129m 3.50E+06 1.03 3.61E+06 Pu-241 8.30E+06 1.03 8.55E+06 Te-131 6.70E+07 1.03 6.90E+07 Pu-243 1.80E+07 1.03 1.85E+07 Te-131m 1.10E+07 1.03 1.13E+07 Am-241 8.20E+03 1.03 8.45E+03 Te-132 1.10E+08 1.03 1.13E+08 Am-242 4.50E+06 1.03 4.64E+06 Te-133 9.10E+07 1.03 9.37E+07 Cm-242 2.20E+06 1.03 2.27E+06 Te-133m 5.80E+07 1.03 5.97E+07 Cm-244 1.30E+05 1.03 1.34E+05 LOCA DOSE CONSEQUENCES USING AST METHODS Initial RCS Source Term:

Accounts for 1% Failed Fuel (limitation from previous operating experience, not accident related). Initial RCS Source Term: The Iodine concentration is set at the 0.5 µCi/gm RCS Mass: 441,900 lbm Release Fractions: Per RG-1.183 Release Timing: Per RG-1.183 LOCA DOSE CONSEQUENCES USING AST METHODS RCS Source Term Nuclide Activity Kr-85 7.70E+00 Kr-85m 1.80E+00 Kr-87 1.20E+00 Kr-88 3.50E+00 I-131 3.5 28 E-01 I-132 5.796 E-01 I-133 6.8 04 E-01 I-134 1.5 88 E-01 I-135 4.788 E-01 Xe-133 2.40E+02 Xe-135 7.90E+00 Kr-83m 4.50E-01 Br-8 3 8.80E-02 Br-84 5.00E-02 I-130 2.2 0E-0 2 Xe-131m 2.90E+0 0 Xe-133m 4.60E+00 Xe-135m 4.50E-01 Xe-138 7.20E-01 LOCA DOSE CONSEQUENCES USING AST METHODS Containment Leakage Parameters:

Parameter Value Containment Volume 2.03E6 cubic Feet Sprayed Volume 1,668,660 cubic feet Unsprayed Volume 361,240 cubic feet Containment Leakage 0.15% of volume per day for first 24 Hours 0.075% of volume per day for remainder Containment Leakage Filtration None Containment Long Term Sump pH -evolution of Iodine) 13.7 hr-1 5.45 hr-1 during injection mode 5.03 hr-1 during recirculation mode Containment Spray Organic removal None Natural Deposition, Aerosol only 0.1 hr-1 in unsprayed areas only Containment Spray Start 90 seconds Containment Spray Stop 8 Hours Containment Spray Flow 2,480 gal/min in injection phase 2,290 gal/min in recirculation phase Iodine Chemical Form 95% Cesium Iodide, 4.85% elemental, 0.15% organic Containment Purge Leakage Parameter Value Iodine Chemical Form 95% Cesium Iodide, 4.85% elemental, 0.15%

organic Containment Purge Filtration None Removal by wall deposition 0% Removal by Sprays 0% Containment Purge Isolation Containment Purge Flowrate 2850 CFM LOCA DOSE CONSEQUENCES USING AST METHODS ECCS Leakage:

Sump Volume: 49,200 cubic feet Sump temperature Varies, max is 261 ºF ESF Leakage Initiation Time 20 minutes ESF Leakage Iodine Flashing Factor: 10% Iodine Species ECCS Leakage Released to the Atmosphere Elemental 97% Organic 3% ECCS Leakage Rate 40,000 cc/hr RWST Leakage Parameters:

Parameter Value ECCS Recirculation Start Time 20 minutes Iodine Species ECCS Leakage Released to the Atmosphere from the RWST Elemental 100% Organic 0% ECCS Leakage Rate to the RWST 2 gal/min RWST Leakage Iodine Flashing Factors: Varies with temp. and pH RWST Capacity 505,562 gallons RWST Volume at Transfer to Recirculation 29,002 gallons

LOCA DOSE CONSEQUENCES USING AST METHODS CR Parameters Parameter Value CR Volume 114,000 ft3 CR Pressurization Mode Initiation Automatic at 60 Seconds CR Ventilation System Normal Flow Rate 1950 cfm < 60 seconds CR Ventilation System Makeup Rate 375 cfm > 60 seconds CR Ventilation System Recirculation Flow Rate 2700 cfm > 60 seconds CR Ventilation System Charcoal Filter Efficiencies Pressurization Filters 98.5% all iodines Recirculation Filters 94.5% elemental and organic 98.5% particulate CR Unfiltered Inleakage 315 cfm CR Ingress/Egress Unfiltered Inleakage 10 cfm CR Breathing Rate 3.5E-4 m 3/sec Occupancy Factors 0-24 hours 1.0 1 - 4 days 0.6 4 -30 days 0.4 Atmospheric Dispersion Factors (sec/m

3)  : Containment Releases: Time (hr) EAB LPZ CR 0 - 2 7.6E-4 2.80E-4 1.66E-03 2 - 8 - 1.10E-4 1.36E-03 8 - 24 - 1.00E-5 6.81E-04 24 - 96 - 5.40E-6 5.60E-04 96 - 720 - 2.90E-6 4.21E-04 Plant Vent Releases: Time (hr) EAB LPZ CR 0 - 2 7.6E-4 2.80E-4 1.65E-03 2 - 8 - 1.10E-4 1.38E-03 8 - 24 - 1.00E-5 7.20E-04 24 - 96 - 5.40E-6 5.47E-04 96 - 720 - 2.90E-6 3.63E-04 Plant Vent to Normal CR HVAC Intake: 0 - 0.0083 (hour) 2.79E-03 sec/m 3 (for containment purge model)

LOCA DOSE CONSEQUENCES USING AST METHODS RWST Releases: Time (hr) EAB LPZ CR 0 - 2 7.6E-4 2.80E-4 4.97E-04 2 - 8 - 1.10E-4 3.82E-04 8 - 24 - 1.00E-5 1.70E-04 24 - 96 - 5.40E-6 1.28E-04 96 - 720 - 2.90E-6 1.00E-04

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