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License Amendment Request Adoption of Emergency Action Level Schemes Pursuant to NEI 99-01, Revision 6 - Radiological Effluent EAL Threshold Values, EP-CALC-RBS-1801, Rev. 0
	ML18128A053
Person / Time
Site:	River Bend
Issue date:	04/25/2018
From:	Mccain S; Entergy Operations
To:	; Office of Nuclear Reactor Regulation
References
	RBG-47847 EP-CALC-RBS-1801, Rev 0
	Download: ML18128A053 (29)
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{{#Wiki_filter:ENCLOSURE 5 RBG-47847 SUPPORTING REFERENCED DOCUMENT PAGES

River Bend Station (RBS) Radiological Effluent EAL Threshold Values EP-CALC-RBS-1801 Revision 0 OSSI Author: Scott McCain Site Technical Reviewer: EP Manager Approval: 03/26/18 Technical Reviewer: ~~ 4faS7,t: EPManagerApproval: ~u('. tfe4Sure~~/

RBS EAL Technical Bases Cafcutatio111? -Ax1 Effluent S&ries Table of Contents 1*.. PURPOSE.........,................... *.............................. ;........... ;........,...........................,.*.*,.............,.. 3

2. DEVELOPMENT METHODOLOGY.AND BASES.;................................. ".~...................... i.... 3 2.1.

Threshold Limit!;i................... '.................. :...........'......... ;..........,.... ~..................... ;............ 3 2.2, Effluent Release Points........................,................. :..........,~.. ~..... ;.................... '.~.** :.... ;...,.~-. 6 2.3.... Source Tenn............... ~*-***********............................................ :.:.... *~**"*/*H"***;,...,.~-:***""~.. 7 2.4.

/ E-fflu~nt Flow"'-.................... t ""'"f>"'~'"'""' ~.* f-........ *....... ~ u**. ~ s *.............. ~......... ~* 'l....,.,"/.... ~,..,,.--+'i'.~-.... ~ '"-*:+.... ~)"......,;~ ~ *++~.. ""... _ ... ~A.... t ~ 2.5. Release Duration,.............................................,................... ;......................,.............. _.... 9

3. DESIGN INPUTS.......,......... :.....,........................,.......... ;...............,;.....,.................... ~..... ;..*.* ~ 11 3.1. General Constants and Conversion Factors...................... ;;,................................... ;:*.* 11 3.2. Gaseous Effluent............ *.............. *............................................................. :................. 11

4. CALCULAT!ONS............................... ;*......................................... ;.....,...,................. ;...... :....... 12 4.1.

AU1.1 Gaseous Re;fease................................................ ~;............................... ;.... ~.,;.... :., 12

.5.. CONCLUS10NS..................................................................................... *............................... 13 5.1.. Effluent Monitor Reading Resu!ts..........................................................,.................. :... 13 e: REFERENCES.................................... !............,......... ;...................,..................... ::*... ~...,....... 14 ATIACHMENTS Attaohtnent.1 ~ AU1 ~ 1 Gaseous EffJuentEAL Calculations......... *............. *......-..**..;......... ~......'.. :...,.15. AA1.1,.AS1.1*and AG1.1 URI Calculations "'"""'"'*****"*"""'**.... :;.:..*..*. ~.......... 17 /( I EP-CALC-RBS-1801 Page 2 of28 Revision 0

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RBS EAL Technical Bases Calculations -Ax1 Effluent Serjes PURPOSE The River Bend Station (RBS) Emergency Action Level (EAL) Technical Bases Manual contains background information, event declaration thresholds, bases and references for the EAL and Fission Product Barrier (FPB) values used to implement the Nuclear Energy Institute (NEI) 99-01 Revision 6 EAL guidance. This calculation document provides additional technical detail specific to the derivation of the gaseous and liquid radiological effluent EAL values developed in accordance with the guidance in NEI 99-01 Revision 6. Documentation of the assumptions, calculations and results are provided for the RBS Ax1 series EAL effluent monitor values associated the NEI 99-01 Revision 6 EALs listed below. NEI EAL AU1.1 (gaseous and liquid} NEI EAL AA 1.1 (gaseous and liquid) NEI EAL AS1.1 (gaseous) NEI EAL AG1.1 (gaseous)

2.

DEVELOPMENT METHODOLOGY AND BASES 2.1. Threshold Limits 2.1.1. AU1.1 Liquid Threshold Limits Guidance Criteria The AU1 Initiating Condition (IC) addresses a release of gaseous or liquid radioactivity greater than 2 times the Offsite Dose Calculation Manual (ODCM) limits for 60 minutes or longer. RBS Bases ODCM Section 7.2.1 states that the limits for the concentration of radioactive liquid effluents released from the site to unrestricted areas are as follows: Ten (10) times the concentrations specified in 10 CFR Part 20, Appendix B, Table 2, Column 2 for radionuclides other than dissolved or entrained noble gases. 2.0E-04 µCi/ml total activity for dissolved or entrained noble gases. The site specific AU 1.1 liquid effluent EAL threshold value will equate to 2 times the alarm setpoint. EP-CALC-RBS-1801 Page 3 of28 Revision O

RBS EAL Technical Bases Calculations -Ax1 Effluent Series 2.1.2. AU1.1 Gaseous Threshold Limits Guidance Criteria The AU1 IC addresses a release of gaseous or liquid radioactivity greater than 2 times the ODCM limits for 60 minutes or longer. RBS Bases ODCM Section 8.3.1.1 states that the limits for the radioactive gaseous effluents released from the site at or beyond the site boundary are as follows: Less than or equal to 500 mrem/yr to the total body (Noble Gases) Less than or equal to 3000 mrem/yr to the skin (Noble Gases) Less than or equal to 1500 mrem/yr to any organ (1-131, 1-133, tritium and radioactive materials in particulate form with half-lives > 8 days) ODCM gaseous setpoint calculations are based on the noble gas limits. Organ dose includes inhalation, ingestion and deposition pathways and are applied in unrestricted area site boundary gaseous effluent dose calculations used in the Annual Radioactive Effluent Release Report. Ingestion pathway bases are not compatible or directly comparable with short term event considerations and are not a significant contribution to the total dose (total body or skin dose limits from noble gas are the major exposure pathway). Thus, the organ dose limit is not applicable for EAL threshold determination. The site specific AU1.1 gaseous effluent EAL threshold values will equate to 2 times the ODCM limit for the lesser of the total body or skin exposure pathways. 2.1.3. AA 1.1 Liquid Threshold Limits Guidance Criteria The AA 1 IC addresses a release of radioactivity resulting in offsite dose greater than 1 O mrem TEDE or 50 mrem thyroid COE. This is based on values at 1% of the EPA Protective Action Guides (PAGs). Per NEI 99-01, the effluent monitor readings should correspond to the above dose limits at the "site-specific dose receptor point" (consistent with the calculation methodology employed) for one hour of exposure. RBS Bases The liquid effluent limits are based on the water concentration values given in 1 O CFR 20 Appendix B Table 2 Column 2 (see Section 2.1.1 above}. The 10 CFR 20 values are equivalent to the radionuclide concentrations which, if ingested continuously over the course of a year, would produce a total effective dose equivalent of 0.05 rem (50 mrem). The EPA PAGs are based on a TEDE dose from immersion, inhalation and deposition. The 10 CFR 20 limits and the EPA limits do not represent the same type of exposure and thus cannot be compared on a one to one basis. EP-CALC-RBS-1801 Page4 of28 Revision 0

RBS EAL Technical Bases Calculations - Ax1 Effluent Series Thus, the site specific EALs will not contain an AA 1.1 liquid effluent monitor threshold value that equates to 1 % of the EPA PAG. However, EALs AA 1.3 (liquid effluent sample analysis) and AA 1.4 (field survey results) will remain applicable for liquid effluent releases that exceed their respective thresholds. 2.1.4. AA 1.1 Gaseous Threshold Limits Guidance Criteria The AA 1 IC addresses a release of radioactivity resulting in offsite dose greater than 10 mrem TEOE or 50 mrem thyroid COE. Per NEI 99-01, the effluent monitor readings are based on values at 1 % of the EPA PAGs at the "site-specific dose receptor point" (consistent with the calculation methodology employed) for one hour of exposure. RBS Bases The gaseous effluent limits for AA 1.1 are based on values that equate to an offsite dose greater than 1 O mrem TEOE or 50 mrem COE thyroid, which are 1 % of the EPA PAGs. 2.1.5. AS1.1 Gaseous Threshold Limits Guidance Criteria The AS1 IC addresses a release of radioactivity resulting in offsite dose greater than 100 mrem TEOE or 500 mrem thyroid COE. This is based on values at 10% of the EPA PAGs at the "site-specific dose receptor point" (consistent with the calculation methodology employed) for one hour of exposure. RBS Bases The gaseous effluent limits for AS1.1 are based on values that equate to an offsite dose greater than 100 mrem TEDE or 500 mrem COE thyroid, which are 10% of the EPA PAGs. 2.1.6. AG1.1 Gaseous Threshold Limits Guidance Criteria The AG1 IC addresses a release of radioactivity resulting in offsite dose greater than 1,000 mrem TEOE or 5,000 mrem thyroid COE. This is based on values at 100% of the EPA PAGs at the "site-specific dose receptor point" (consistent with the calculation methodology employed) for one hour of exposure. RBS Bases The gaseous effluent limits for AG1.1 are based on values that equate to an offsite dose greater than 1,000 mrem TEDE or 5,000 mrem COE thyroid, which are 100% of the EPA PAGs. EP-CALC-RBS-1801 Page 5 of 28 Revision 0

RBS EAL Technical Bases Calculations - Ax1 Effluent Series 2.2. Effluent Release Points Note - All effluent release points assume a background reading of zero to conservatively account for all modes of operation applicable to the EA Ls. 2.2.1. Liquid Release Points Guidance Criteria Per NEI 99-01, the AU1 IC addresses normally occurring continuous radioactivity releases from monitored gaseous or liquid effluent pathways (NEI AU1 EAL #1) and planned batch releases from non-continuous release pathways (NEI AU1 EAL #2). Per NEI 99-01, the AA 1 IC includes events or conditions involving a monitored or un-monitored gaseous or liquid radiological release. Classification based on effluent monitor readings assumes a release path to the environment. If the effluent flow past an effluent monitor is known to have stopped due to actions to isolate the release path, then the effluent monitor reading is no longer valid for classification purposes. The "site-specific monitor list and threshold values" should be determined with consideration of the appropriate installed gaseous and liquid effluent monitors. RBS Bases ODCM Figure 4 illustrates two monitors in liquid discharge pathways at RBS. RMS-RE107 - Liquid Monitor RMS-RE108-Cooling Tower Slowdown Per ODCM Section 7.2.2.1, principal sources of liquid radwaste are from floor drains, phase separators/backwash tank subsystem, recovery sample tanks, and reactor water cleanup from batch releases monitored by RE107. Cooling Tower Slowdown is used for batch discharge dilution flow and is not itself a normal source of radioactive liquid discharge. Thus, RE108 is not included in the ODCM setpoint calculations. 2.2.2. Gaseous Release Points Guidance Criteria Per NEI 99-01, the AU1 IC addresses normally occurring continuous radioactivity releases from monitored gaseous or liquid effluent pathways (NEI AU1 EAL #1) and planned batch releases from non-continuous release pathways (NEI AU1 EAL #2). Per NEI 99-01, the AA 1 IC includes events or conditions involving a monitored or un-monitored gaseous or liquid radiologlcal release. Per NEI 99-01, the AS1 and AG1 ICs includes events or conditions involving a monitored and un-monitored of gaseous radiological release. EP-CALC-RBS-1801 Page 6 of28 Revision D

RBS EAL Technical Bases Calculations - Ax1 Effluent Series Classification based on effluent monitor readings assumes a release path to the environment. If the effluent flow past an effluent monitor is known to have stopped due to actions to isolate the release path, then the effluent monitor reading is no longer valid for classification purposes. The "site-specific monitor list and threshold values" should include the effluent monitors described in emergency plan and emergency dose assessment procedures. RBS Bases ODCM Section 8.1 lists three monitors in the gaseous radioactivity discharge pathways at RBS. Main Plant Exhaust Vent-WRGM RMS-RE125 / Particulate and Gas Monitor RMS-RE126 Fuel Building Exhaust Vent - WRGM RMS-RESA / Particulate and Gas Monitor RMS-RE5B Radwaste Building Exhaust Vent~ WRGM RMS-RE6A / Particulate and Gas Monitor RMS-RE68 2.3. Source Term 2.3.1. AU1.1 Gaseous Source Term Guidance Criteria \\; NEI 99-01 does not provide specific guidance for AU1 gaseous source term assumptions. RBS Bases The AU1.1 gaseous effluent EAL threshold is based on the 2010-2014 Annual Radioactive Effluent Release Reports. For purposes of the EAL thresholds historical annual release report activity is used as a representative basis. Future annual release report results need not require a recalculation of EAL thresholds. Annual Report Gaseous Effluent Mixed Mode Releases 2010 2011 2012 2013 2014 5yrTotal Gas (CIM (Cf/v) (CIM .(CIM (CiM . (CIM Fraction Ar-41 O.OOE+OO O.OOE+OO O.OOE+OO 1.01E+OO O.OOE+OO 1.01E+OO 4.33E-03 Kr..S5m 2.44E+OO 2.73E+OO 4.64E-01 4.42E-01 O.OOE+OO 6.0BE+OO 2.61E-02 Kr-87 9.31E-01 5.77E-01 0.00E+OO 1.29E-01 O.OOE+OO 1.64E+OO 7.02E-03 Kr.SB 2.23E-01 2.09E+OO O.OOE+OO 1.36E-01 O.OOE+OO 2.45E+OO 1.05E-02 Xe-133 5.02E+OO 2.51E+OO 2.70E+OO 1.23E-01 1.1SE+OO 1.15E+01 4.94E-02 Xe-135 5.28E+01 3.07E+01 1.27E+01 1.80E+OO 3.16E+OO 1.01E+02 4.34E-01 Xe-135m 3.58E+01 3.60E+01 1.15E+01 7.35E-01 1.26E+OO 8.53E+01 3.66E-01 Xe-137 3.37E+OO 3.62E-01 O.OOE+OO O.OOE+OO O.OOE+OO 3.75E+OO 1.61E-02 Xe-138 7.71E+OO 9.15E-01 O.OOE+OO 1.17E+01 O.OOE+OO 2.03E+01 8.72E-02 Totals 1.0BE+02 7.59E+01 2.74E+01 1.61E+01 5.58E+OO 2.33E+02 1.00E+OO EP-CALC-RBS-1801 Page 7 of28 Revision 0

RBS EAL Technical Bases Calculations - Ax1 Effluent Series Annual Report Gaseous Effluent Ground Releases 2010 2011 2012 2013

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{Clivl Xe-133 1.60E-01 5.97E-01 O.OOE+OO 0.00E+OO Xe-135 7.50E+OO 4.75E+OO 3.11E+OO 6.53E-01 Xe-135m 4.47E+OO 2.19E+OO 3.92E+OO 1.14E+OO Totals 1.21E+01 7.54E+OO 7.03E+OO 1.79E+OO 2.3.2. AA 1.1. AS1.1 and AG1.1 Gaseous Source Terms Guidance Criteria .2014 5y(Tota1* .Gasr (CIM (Ci!v) Fraction 0.00E+OO 7.57E-01 2.31E-02 1.53E+OO 1.75E+01 5.36E-01 2.68E+OO 1.44E+01 4.40E-01 4.21E+OO 3.27E+01 1.00E+OO NEI 99-01 specifies that the calculation of monitor readings will require use of an assumed release isotopic mix; the selected mix should be the same for !Cs AA 1, AS1 and AG1. RBS Bases TheAA1.1, AS1.1 and AG1.1 gaseous EAL thresholds are based on RBS URI dose model results using input assumptions applicable to the event, pathway and particular monitor. The source term used in the URI dose model is taken from NUREG-1940 Table 1. 1 (URI Requirements Specification Appendix A Section A.2). The process reductions used in the URI dose model are taken from NUREG-1228 and NUREG-1465 (URI Requirements Specification Appendix A Sections A.4 and A.5). Note - HUT is hold-up time. Other than the fuel handling accident scenario, the release paths selected were chosen to represent a LOCA type event with fuel clad damage and process reductions for applicable suppression pool and bypass release pathways. URI input assumptions for the gaseous release points are as follows: RCS Pool Rx Bldg Filter Subcooled HUT <2 hrs Workin MPE Stack Env Release path 'P' selected to model a LOCA type event with fuel clad damage and suppression pool reduction through the Main Plant Exhaust Vent. RCS* Pool Rx Bldg Fuel Bldg Filter , Subcooled HUT <2 hrs HUT <2 hrs Workin FB Stack Release path 'T' selected to model a LOCA type event with fuel clad damage and suppression pool reduction through the Fuel Building Exhaust Vent. Pool Rx Bldg RW Bldg f llter RCS Subcooled HUT <2 hrs HUT <2 hrs Workin RW Stack Release path 'V' selected to model a LOCA type event with fuel clad damage and suppression pool reduction through the Radwaste Building Exhaust Vent. Env Env EP-CALC-RBS*1801 Page 8 of 28 Revision 0 /

RBS EAL Technical Bases Calculations - Ax1 Effluent Series A 1 hour time after shutdown (TAS) is used for the source decay period as it is long enough for plant conditions to deteriorate for core damage to occur and a significant release to start. 2.4. Effluent Flow 2.4.1. Effluent Gaseous Vent Flow Guidance Criteria NEI 99-01 does not provide specific guidance for effluent gaseous vent flow assumptions. RBS Bases Vent flow values are taken from: Main Plant Exhaust - URI default flow Fuel Building Vent - URI default flow Radwaste Building Vent - PID-22-05A and USAR Figure 9.4-3a (based on the sum of HVW-FLT1A/B provided by either HVW-FN4A or HVW-FN48 at 4,000 cfm, and 2 of the 3 HVW-FN1A, B or C flowpaths at 38,200 cfm each) Refer to Section 3.2.2 for the input values related to the effluent flow parameter. 2.5. Release Duration Guidance Criteria Per NEI 99-01, the effluent monitor readings for AS1. 1 and AG1. 1 gaseous EAL threshold values should correspond to a dose at the "site-specific dose receptor point" (consistent with the calculation methodology employed) for one hour of exposure. RBS Bases The effluent monitor readings for AA 1.1, AS 1.1 and AG 1.1 gaseous EAL threshold values are calculated for a release duration of one hour. 2.6. Meteorology Guidance Criteria The effluent monitor readings should correspond to the applicable dose limit at the "site-specific dose receptor point." The "site-specific dose receptor point" is the distance(s) and/or locations used by the licensee to distinguish between on-site and offsite doses. The selected distance(s) and/or locations should reflect the content of the emergency plan, and the procedural methodology used to determine offsite doses and protective action recommendations. This is typically the boundary of the Owner Controlled Area. Monitor readings will be calculated using a set of assumed meteorological data or atmospheric dispersion factors; the data or factors selected for use should be the same for ICs M1, AS1 and AG1. EP-CALC-RBS-1801 Page 9 of 28 Revision 0

RBS EAL Technical Bases Calculations - Ax1 Effluent Series RBS Bases The site-specific meteorology used for the EAL calculation inputs are based upon the USAR and ODCM as documented below. 2.6.1. ODCM Gaseous Dispersion Factor (ODCM Table E-1) The highest annual average dispersion factor for the restricted area boundary for all Sectors. Ground Level = 6.54E-5 sec/m3 to the West Sector (Radwaste and Fuel Buildings) e Mixed Mode= 3.31 E-6 sec/m3 to the WNW Sector (Main Plant Exhaust) For purposes of the EAL thresholds the current OOCM dispersion factor is used as a representative basis. Any future changes in ODCM dispersion factor results need not require a recalculation of EAL thresholds. 2.6.2. Stability Class USAR Tables 2.3-36 to 42 (30' tower) and Tables 2.3-76 to 82 (150' tower) document the predominant stability class as 'E'. Additionally, the cumulative hours from the 2011-2014 Annual Radioactive Effluent Release Reports indicate stability class 'E' as the predominant stability for the 30' and 150' towers. Thus, stability class "E" is used as the URI input for purposes of the EAL calculations. For purposes of the EAL thresholds the USAR historical stability class is used as a representative basis. Any future changes in USAR stability results need not require a recalculation of EAL thresholds. 2.6.3. Wind Speed USAR Table 2.3-31 documents the annual average wind speed of 3.7 mph. Thus, a wind speed of 3. 7 mph is used as the URI input for purposes of the EAL calculations. For purposes of the EAL thresholds the USAR historical wind speed is used as a representative basis. Any future changes in ~SAR wind speed results need not require a recalculation of EAL thresholds. 2.6.4. Wind Direction USAR Table 2.3-32 documents the predominant wind direction to the East sector. Thus, a wind direction input of 270° (winds from) is used as the URI input for purposes of the EAL calculations. For purposes of the EAL thresholds the USAR historical wind direction is used as a representative basis. Any future changes in USAR wind direction results need not require a recalculation of EAL thresholds. 2.6.5. Other Parameters No precipitation is assumed to occur for the duration of the release and plume transport across the Emergency Planning Zone. EP-CALC-RBS-1801 Page 10 of 28 Revision O

RBS EAL Technical Bases Calculations - Ax1 Effluent Series

3.

DESIGN INPUTS 3.1. General Constants and Conversion Factors 3.1.1. 4 72 cc/sec per cfm 3.2. Gaseous Effluent 3.2.1. Gaseous Effluent Monitor Ranges (G13.18.9.4-065) Note - Main Plant Exhaust Vent, Fuel Building Exhaust Vent and Radwaste Buifding Exhaust Vent Particulate and Gas monitors have identical ranges.

1) Particulate and Gas Monitor........................................................... 1 E-7 to 1E-2 µCi/cc Note - Main Plant Exhaust Vent, Fuel Building Exhaust Vent and Radwaste Building Exhaust Vent WRGMs have identical ranges.

2) WRGM Low Range........................................................................ 1 E-7 to 1E-1 µCi/cc

3) WRGM Medium Range................................................................. 1 E-4 to 1 E+2 µCi/cc

4) WRGM High Range....................................................................... 1 E-1 to 1 E+5 µCi/cc 3.2.2. Gaseous Effluent Source Flow -

f

1) Main Plant Exhaust Vent (URI Default)..................................................... 123,000 cfm

2) Fuel Building Exhaust Vent (URI Default)................................................... 10,000 cfm

3) Radwaste Building Exhaust Vent (PID-22-05A).......................................... 80,400 cfm 3.2.3. AU1.1 X/Q Dispersion Factor (ODCM Table E-1)

1) Ground Level Release Points (Radwaste and Fuel Buildings).............. 6.54E-5 sec/m3

2) Mixed Mode Release Points (Main Plant)............................................. 3.31 E-6 sec/m3 3.2.4. ODCM Dose Factors {ODCM Table C-1) y,,-Body Kl f3-Skin LI.

y-Ali'MI. (mrem/vr per uci/m3) (mremlvr per uCl/m3) (mrad/vr per uCf/m3)

Ar-41 8.84E+03 2.69E+03 9.30E+03 Kr,.83m 7.56E.:02 O.OOE+OO 1.93E+01 Kr-85m 1.17E+03 1.46E+03 1.23E+03 Kr-85 1.61E+01 1.34E+03 1.72E+01 Kr-87 5.92E+03 9.73E+03 6.17E+03 Kr-88 1.47E+04 2.37E+03 1.52E+04 Kr:.S9 1.66E+04 1.01E+04 1.73E+04 Kr-90 1.56E+04 7.29E+03

.1.63E+04 xe:..131m 9.15E+01 4.76E+02 1.56E+02 Xe-133m 2.51E+02 9.94E+02 3.27E+02 Xe"'.133 2.94E+02 3.06E+02 3.53E+02 Xe"135m 3.12E+03 7.11E+02 3.36E+03 Xe-135 1.81E+03 1.86E+03 1.92E+03 xe:.137 1.42E+03 1.22E+04 1.51E+03 Xe-138 8.83E+03 4.13E+03 9.21E+03 EP-CALC-RBS-1801 Page 11 of 28 Revision 0

RBS EAL Technical Bases Calculations - Ax1 Effluent Series

4.

CALCULATIONS 4.1. AU1.1 Gaseous Release 4.1.1. Gaseous Release at the ODCM Limit 500 SPwhole body = _4_7_2 _x_f_x....,x""'"";_Q_RP_x_}.:_(_Q_i_x_K_i_*) 3000 SPskin = X 412 x t x IQ x J.:CQi x CL1 + 1.1Ma) RP Where: SP radiation monitor setpoint equivalent to the ODCM limit (µCi/cc) 500/3000 Dose limit - 500 whole body or 3000 skin (mrem/yr) 472 conversion factor (cc/ft3 per sec/min) f vent flow (cfm) XIQRP highest land annual average dispersion factor for the release point (sec/m3) Q, activity released (fraction - unit less) K1 whole body dose correction factor (mrem/yr per µCi/m 3) L, + 1.1 M, skin dose factor (mrem/yr per µCi/m3) 4.1.2. AU 1.1 Gaseous Release EAL Threshold l AU1.1 gaseous is two times (2x) the lesser of the calculated whole body or skin ODCM limit setpoint. Refer to Attachment 1 for the spreadsheet calculations that develop the AU1.1 gaseous effluent EAL threshold values for each applicable monitor. 4.1.3. Gas & Particulate Monitors and WRGMs The AA 1.1, AS1.1 and AG1.1 gaseous release EAL thresholds for the gas & particulate monitors and WRGMs are developed using the RBS URI dose assessment.model wlth the inputs described in Section 2 above. Refer to Attachment 2 for the results of the URI gaseous effluent EAL threshold calculations. EP-CALC-RBS-1801 Page 12 of 28 Revision O

RBS EAL Technical Bases Calculations - Ax1 Effluent Series

5.

CONCLUSIONS 5.1. Effluent Monitor Reading Results Release 'Poirit - -Monitor GE-* -- SAE Alert UE Main Plant Exhaust RMS-RE126 (µCi/ml) N/A NIA 1.66E-1 1.74E-3 ~-----* Vent RMS-RE125 (µCi/sec) 9.56E+8 9.56E+7 9.63E+6 1.01E+5 II). RMS-RESS (µCi/ml) N/A N/A 1.72E-1 1.38E-3 2 _ Fuel Building Exhaust

g Vent RMS-RESA (µCi/sec) 7.75E+8 7.75E+7 7.75E+6 6.50E+3

(!) , Radwaste Building RMS-RE68 (µCi/ml) NIA N/A 2.12E-1 1.71 E-4 ,......._,,,,...,.,_,_-,,-~--,, ~--"--*-*,o.-~,, Exhaust Vent RMS-RE6A (µCi/sec) 8.03E+B 8.03E+7 8.03E+6 6.96E+4 ~. Radwaste Liquid RMS-RE107 (µCi/ml) N/A NIA N/A 2xAlarm

3" Effluent Monitor Setpoint EP-CALC-RBS-1801 Page 13 of28 Revision 0

RBS EAL Technical Bases Calculations - Ax1 Effluent Series

6.

REFERENCES 6.1. NEI 99-01 Revision 6, Methodology for Development of Emergency Action Levels, November 2012 6.2. 10 CFR 20 Appendix B Table 2 Column 2 6.3. EPA-400-R-92-001, Manual of Protective Actions for Nuclear Incidents, May 1992 6.4. NUREG-1228, Source Term Estimation During Incident Response to Severe Nuclear Power Plant Accidents, October 1988 6.5. NUREG-1465, Accident Source Terms for Light-Wat~r Nuclear Power Plants, February 1995 6.6. NUREG-1940, RASCAL 4: Description of Models and Methods, December 2012 6.7. River Bend Station Offsite Dose Calculation Manual (ODCM), Revision 15 6.8. Unified RASCAL Interface Requirement Specification, Draft 051611 6.9. Unified RASCAL Interface Requirement Specification River Bend Site Annex, Version 2, Draft 12/07/14 6.10. River Bend Station USAR Table 2.3-31 0 Table 2.3-32 Tables 2.3-36 to 42 Tables 2.3-76 to 82 Figure 9.4-3a 6.11. PID-22-0SA, Engineering P & I Diagram System 407 HVAC - Radwaste Building, Revision 13 6.12. Radioactive Effluent Release Reports 2010-G9.5, G9.25.1.5, 04/28/11 e 2011 - RBG-47237 I RBFi-12-0060, 04/30/12 2012 - RBG-47359 / RBF1-13-0060, 05/01/13 2013-RBG-47467 / RBF1-14-0068, 05/01/14 2014-RBG-47562 / RBFi-15-0066, 05/01/15 j EP*CALC-RBS-1801 Page 14 of 28 Revision 0

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Xe.: .135m 3.1E+03 7.1E+02

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~

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0 0 .E 13 rn en E I! 0 'f"" N "i"" m* E* ; 0 0 0 ,(!): - N N C'\\I, 9.3E+03 O.OOE+OO O.OOE+OO O.OOE+OO 1.2E+03 2.44E+OO 2.73E+OO 4.64E-01 6.2E+03 9.31E-01 5.77E-01 0.00E+OO 1.5E+04 2.23E-01 2.09E+OO O.OOE+OO 3.5E+02 5.02E+OO 2.51E+OO 2.70E+OO 1.9E+03 5.28E+01 3.07E+01 1.27E+01 3.4E+03 3.58E+01 3.60E+01 1.15E+01 1.5E+03 3.37E+OO 3.82E-01 O.OOE+OO 9.2E+03 7.71E+OO 9.15E-01 O.OOE+OO 1.08E+02 7.59E+01 2.74E+01 Total Body Limit (mremlyr}: ___ soo_ Skin Dose Limit (mrem/yr}:,___3_000___. UCF (cc/sec per cfm): ~ DCF (mrad to mrem): c:==JJ] 'i:" ~ 0 - I E... Q)* I-ID* (,)...

I

~ C').... 0 N 1.01E+OO 4.42E-01 1.29E-01 1.36E-01 1.23E-01 1.BOE+OO 7.35E-01 O.OOE+OO 1.17E+01 1.61E+01 C I lated Set. t R It acu tpom esu s Pl t V t an en SP-lB (µCi/sec): 5i04E+04 1 SP-Skin (µCi/sec}: 5J09E+/-05 SP-lB (µCi/cc): ;8!68&041 SP-Skin (µCi/cc): fBFZ7E.:!Q3; EP-CALC-RBS-1801 Page 15 of28

2.

I *e {!!. -ID e 0 rn ~ ,0 N O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 1.16E+OO 3.16E+OO 1.26E+OO O.OOE+OO O.OOE+OO 5.58E+OO AU1.1 Gaseous Effluent EAL Calculations 'i:" a 0 C (') 0 C") E t$ E E {!!. 0 m

- 0 u.;

t

r::* :i -- -

I!) I""'.... 0 E Ill 'Ii,!.l!l.

s Q.

0 {! +.... U) l1J 2-e de -~ m Cl>

II

->< I:! )( f

o.

..:.. E --E I.D UJ -*-

*-- a.-

_a._. 1.01E+OO 4.33E-03 3.83E+Oi 1.16E+01 6.08E+OO 2.61E-02 3.05E+01 3.80E+01 1.64E+OO 7.02E-03 4.16E+01 6.83E+01 2.45E+OO 1.0SE-02 1.54E+02 2.49E+01 1.15E+01 4.94E-02 1.45E+01 1.51E+01 1.01E+02 4.34E-01 7.85E+02 8.07E+02 8.53E+01 3.66E-01 1.14E+03 2.60E+02 3.75E+OO 1.61E-02 2.28E+01 1.96E+02 2.03E+01 8.72E-02 7.70E+02 3.60E+02 2.33E+02 1.00E+OO 3.ooe+oa* 1~78E-t:03 Plant Vent Dispersion - X/Q (sec/m3): 3.31E-06 Effluent Flow - f ( cfm): 1.23E+05 Calculated UE Threshold Results Plant Vent AU1.1 (µCi/sec}: -~iOitEf.65* AU1.1 (µCi/cc}: ;if.17'.'iE;!031 Revision 0

I AU1.1 Gaseous Effluent EAL Calculations 'X*133 2.9E+02 3.1E+02 3.5E+02 1.60E-01 5.97E-01 O.OOE+OO O.OOE+OO O.OOE+OO 7.57E-01 2.31E-02 6.B1E+OO 7.0BE+OO . iXe;.135 1.8E+03 1.9E+03 1.9E+03 7.50E+OO 4.75E+OO 3.11E+OO 6.53E-01 1.53E+OO 1.75E+01 5.36E-01 9.71E+02 9.9BE+02 )X~135m 3.1E+03 7.1E+02 3.4E+03 4.47E+OO 2.19E+OO 3.92E+OO 1.14E+OO 2.68E+OO 1.44E+01 4.40E-01 1.37E+03 3.13E+02 1.21E+01 7.54E+OO 7.03E+OO 1.79E+OO 4.21E+OO 3.27E+0.1 1.00E+OO 2{3Sa03.;1~32Et03 Calculation Constants Calculated Set EP-CALC-RBS-1801 Total Body Limit (mrem/yr): ___ 5_00-1 Skin Dose Limit (mremfyr):*,__ ___ 3_000_.. int Results* UCF (cc/sec per cfm): ~ DCF (mrad to mrem): i==:JJ:] SP-TB (µCi/sec): SP-Skin (µCi/sec): SP-TB (µCi/cc): SP-Skin {µCi/cc): Calculated UE Threshold Results Fuel Bid RW Bldg AU1.1 (µCi/sec): '.6!50E~i &:tiGE~ AU1.1 (µCi/cc): ;~iaffE:!031~~t7iiE~t. Page 16 of28 Revision O AA 1.1, AS1.1 and AG1.1 URI Calculations Main Plant Exhaust Vent RMS-RE125-General Emergency Dose Assessment River Bend Thursday, Morch 8, 2018 21:30 Method: Detniled Assessment - Monitored Release Relense Pnthwny: <RCS> <Supp Pool> <Rx Bldg> <filter> <Main Plant Exll> <Env> Fu: Bldg HUT:=< 2 HO!lr5 Supp Poot Sb!us = Subcooled Aux RW Turb FB HITT: = NJA PRF: 4.00E-05 FBIRW Filter. = NIA SBGT Filler.: WDflcing Source Term: Reactor Core Accident - Clad Time After SID (hh:mm): 1:00 Release Duration (hh:mm): 1 :00 ETE (hh:mm): [NIA] Monitor. MPE WRGM Rote Readings: 9.56E+08 uCilsec

'Dlmllnce, Exposure ! !.. exremn.1,. lnhnl:stlon * ' :*l)ep_ool!km* i
Rlite.

I '...... . *ceoe** *. , ; Plume ooE, GroondDOE: ~- Jt.t;k:~)..... I l' j_RemJ '.~:i ,. (Rem) * '.

(mR/hr).

(Rem} *,:

s.a:*

1.41E+OJ 9.83~:.£!1 1.1 GE.-0.2 "' 6,18E-03 0.7 1.20E+03 8.32E-01 2.12E-02 1.40E-02 1.0 9.20E+02 6.32E-01 2.42E.02 1.66E-02 1.5 6.76E+02 4.60E-01 2.65E-02 1.BOE-02 2.0 5.2BE+02 3.56E-01 2.64E-02 1.73E-02 3.0 4.36E+02 2.81E-01 1.64E-02 1.0SE-02 4.0 3.73E+D2 2.36E-01 1.54E-02 9.42E-03 5.0 3.14E+02 2.12E-01 1.47E-02 8.67E-03 7.0 2.52E+02 1.. 63E-01 1.18E-02 6.47E-03 10.0 1.69E+02 1.07E-01 7.63E-03 3,74E-03 AMessmenl Data Resufls Saw<! IQ File: River Bend IOMiles Monilored Release lll08:Z018 2t30t 1.UR17 Reviewed By: EP-CALC-GGNS-1701 j. TEOE' COE i Thyroid

*. {Reml tRemL.:

, 1.00E+OO 1.54_1:.-01 6.67E-01 1.23E-01 6.73E.01 8.BOE.02 5.04E.01 6,32E-02 4.00E-01 5.00E.02 3.08E.01 3.SSE-02 2.60E-01 2.9SE-02 2.36E-01 2.69E-02 1.B1E-01 2.09E-02 7.18E.01 1.40E-02 Page I o/3 Page 17 of28 Pri Lower Wind: From 270"@ 3-7 mph Stnbftity Cltw; E Precipitation: None EVlff:uatJon.Areetri From O.to:.10 Miles-*. Circle disUnces are 2. 5 and 10 miles. R A B p D N M F K J H Relenae Rotes {Cl/ sec Pnrtlculote odme Noble Gas Rnrtt Bend l 2.0. LO Revision 0 AA1.1, AS1.1 and AG1.1 URI Calculations Main Plant Exhaust Vent RMS-RE125 - Site Area Emergency Dose Assessment River Bend Thursday, Morch 8, 2018 21:33 Method: Detailed Assessment. Monitored Relentle Release Pathway: <RCS> <Supp Pool> <Rx. Bldg> <Filt.er> <Main Pinnt EKfl:. <EnV> Rx Bldg HUT:=< 2 Hour.; Supp Pool Sta!l.Js* = Suboooled Aux RW Tutb FB HUT: = NIA PRF:4.00E*OS FB/RW Filter: = NIA SBGT Fillef; = Womng Source Term: Reactor Core Accident - Clad Time AfterS/0 {hh:mm); 1:00 Release Duration thh:mm): 1:00 ETE (hh:mm): {NIA l Monitor: MPE WRGM Rote Readings: 9.56E+D7 uCilsec Dist:lnctf ; ! Exposure.*,

Extemnl

..,
lnhnlatlon ' *. : Deposition...

- I ~l , ~ Rate.. ~ if!iumi ODE: l ceoe* *:.,<;rouiui' DOE'. :

(Ml!esJ

.* ! {mRJhr). l : _jaemL.J... (Reml ttiem> $6. 1.41E+02 9.83E-02 i.16E-03 6.18E.04 0.7 1.20E+02 B.32E-02 2.121:-03 1.40E-03 1.0 9.20E+Ol B.32E-02 2.42E-03 1.66E-03 1.5 6.76E+01 4.60E-02 2.6SE-03 1.BOE-03 20 5.28E+01 3.56E-02 2.64E-03 1.73E-03 3.0 4.36E+01 2.81E.02 1.64E-03 1.0SE-03 4.0 3.73E+01 2.36E-02 1.54E-03 9-42E-04 5.0 3.14E+01 2.12E-02 1.47E-03 8.67E-04 7.0 2.52E+01 1.63E-02 1.1BE.03 6.47E-04 10.0 1.69E+01 1.07E-02 7.63E-04 3.74E-04 ASSQSSIJMlnt Dab Result$ Saved IX) File; Rive.- Bend 10Miles Moni!cred Release 03082D1B 2.13325.URl7 Reviewed By: EP-CALC-GGNS-1701 .:rEDE ,COE. Thyrtikt (Rem)* i (Remj* tOOE-01 1.54E-02 B.67E-02 1.23E-02 6.73E-02 8.SOE-03 5.04E-02 6.32E-03 4.00E-02 5.00E-03 3.0BE-02 3.S8E-03 2.60E-02 2.98E..03 2.36E-02 2.69E-03 1.81E-02 2.09E-03 1.1BE-02 1.40E-03 Pag~ 1 of3 Page 18 of 28 Pnlower Wind: From 270"@ 3-7 mph StnbUlfy Clae.s: E Precipitation: None EvacilotiotfArea:i F.rom-0.to 10 MIies Cln::le distances are 2. 5 and 10 miles. R A B p D N M F K J H No PAGs Exceeded I me Noble Gns Revision 0 AA 1.1, AS1.1 and AG1.1 URI Calculations Main Plant Exhaust Vent RMS 0 RE125-Alert Dose Assessment River Bend Thunidoy, Morch 8, 2018 21:36 Method: Detailed Assessment - Monitored Release Rcleose Pathway: <RCS> <Supp Pool> <Rx Bldg> <Filter> <Mnin Pinnt Exh> <EnV> Rx Bldg HUT:=< 2 Hours Supp Pool StatuS; = Subcooled Aux RW Tl.lib FB HUT* = NJA PRF: 4.00E-05 FBJRW Filler: = NIA SBGT Filler.= Wedi~ Source Term: Reactor Core Accident - Clad Time After S/D (hh:mm): 1 :00 Releose Duration (hh:mm): 1:00 ETE thh:mm): [NIA J Monitor: MPE WRGM Rate Readings; 9.63E+06 uCilsec ,~~. *; i !:x~.re

Extem_~ : ; lnlumloon / Depos!!lon
\\ I

. Rate , Plume DOE,,. CEDE i Ground DOE <M1iest l f (mRnirL.: :::* ;[iem) : L.lRemi<

{Rem)

SB, 1.4;!_f;+01 9.89E.03 U7E;:Q4 O.OOJ=+OO 0.7 t.21E+01 8.36E-03 2.13E-04 1.41E-04 1.0 9.28E+OO 6.36E-03 2.44E-04 1.67E-04 1.5 6.00E+OO 4.64E-03 2.67E-04 1.81E-04 2.0 S.32E+OO 3.59E-03 2.66E-04 i.74E-04 3.0 4.36E+OO 2.83E-03 1.6SE-04 1.0SE-04 4.0 3.76E+D0 2.37E-03 1.SSE-04 O.OOE+OO 5.0 316E+OO 2.14E-03 1.49E-04 O.OOE+OO 7.0 2.S4E+OO 1.64E-03 1.19E-04 O.OOE+OO 10.0 1.70E+OO 1.07E-03 O.OOE+OO O.OOE+OO Assessment Data Hesults Saved ID File: River Bend 10Miles Monitored Release 03082D 18 2131135. UR17 TEOE {Rein) 1.00E-02 8.71E-03 6.ITE-03 5.09E-03 4.03E-03 3.10E-03 2.53E-03 2.29E-03 1.76E-03 1.07E-03 1 coe* ** ! Thyrold- !,...(R~L. 1.SSE-03 1.24E-03 8.88E-04 6.40E-04 5.04E-04 3 62E-04 3.01E-04 2.71E-04 2.11E-04 1.42E-04 Prilower Wind: From 210*@ 3.7 mph Stnb-ilrn,,i Class; E Precipitation: None .... Evacuctfon km From o:to 10'Miles Cirole disbnces are 2. 5 and 10 miles.. R A B p D N E M F K J H No PAGn EJ!ceciied .__a_*_*_c_Ja=s-s_lflctl Hon:_-_._,-V_o_l_kJ_at_e_nga ln_s_t_i§§io_.-_ncy_,_.A..,ctlon t"-:ev ... e_fll-'-.*-**_*_ .. _____.... :..*....,.**::11---------'R... el'r-e"'-'a;;.,.s... e_R'-"o;c;.te_s..,{... C-'-ii_SEl_c,__ ____ _,, P11rticu!11le

3. 72E-05 (0.1}%}

lr.xli~e

7. i6E-04 (0.0%)

Reviewed By: Noble Gas 9,63E+OO (100.0%) Pao<' 1 of3 Ri-ter Bend 12.11. 1.D EP-CALC-GGNS-1701 Page 19 of 28 RevisloriO Main Plant Exhaust Vent RMS-RE126 - Alert Dose Assessment River Bend Method: Detailed AS!lessment

Monitored Release Release Pathway: <RCS> <Supp Pool> <Rx Bldg> <filter.,, <Main Pinnt Exh> <Em'>

Rx Bldg HUT: = < 2 Hours SUPP Pool S!attr.i: = Subeooled AuK RW Turb FB HUT: = WA SBGT Filter: = Wonung Source Term: Reactor Core AcCldent

Clad nme After SID (hh:mm): 1:00 Release Duration (hh:mm): 1:00 ETE (hh:mm): {N/AJ Monitor. MPE Gns Readings: 1.66E-01 uCi/cc

.rnstanee ""! J:xterriol* Oepooltloo Flowrate: 123000 CFM

lJ:OE*.
COE AA1.1, AS1.1 and AG1.1 URI Calculations Thursday, Morch 8, 2018 21:49 PRF: 4.00E.05 FBIRW Filte,: E NIA Pri Lower Wind: From 270"@3.7 mph Stn.oility Class; E Precipitnlion: None

[ipt~re '. ,1n~;

~': O!JE,i Toyrofd

'Rnte CEDE , Ground ODE. : i. -(mR/lirf..J Cude distances are 2. 5 and TO miles. .. (Miles]: '

__: &emL. : I'.'. _tRem)

,;,l (Rem};

, I (Reml (Remj __

" _SJ~. 1.42E+01 ~-B~E-03 1.17E-04 0 OOE+OO 1.00E-02 1.~!;:0~ A R B 0.7 1.21E+01 8.36E-03 2.13E-04 1.41E.04 8.71E-03 1.24E.03 1.0 9.28E+OO 6.36E..03 2.44E-04 1.67E-04 6.77E-03 8.a.BE-04 1.5 6.84E+OO 4.64E-03 2.67E-04 1.81E.04 5.09E-03 6.40E-04 2.0 5.32E+OO 3.59E-03 2.66E-04 1.74E-04 4.03E-03 5.04E-04 p D 3.0 4.36E+OO 2.83E-03 1.6SE-04 1.06E-04 3.10E-03 3.62E-04 4.0 3,76E+OO 2.37E-03 1.SSE-04 O.OOE+OO 253E-03 3.0lE-04 5.0 3.16E+OO 2.14E-03 U9E-04 0 OOE+OO 2.29E-03 2.71E-04 7.0 2.54E+OO 1.64E-03 1.19E-04 O.OOE+OO t.76E-03 2.nE-04 N E 10.0 t.70E+OO 1.07E-03 OOOE+OO O.OOE+OO 1.07E-03 1.42E-04 Assessment oau Hesultt. Sall'lld IO File: River Bend tOMiles Ltonilored Release 03082018 2 t4Q I 1. URl7 M F K J H R&leooe Rotes (Cl I see) Particulate 3.72E-05 (0.0%) Iodine .16E-04 (0.0%) Reviewed By: Noble Gos 9.64E+OO (100.0%1 Page, of3 Rlvff Bend J 2ll. t.O EP-CALC-GGNS-1701 Page 20 of28 Revision 0 AA1.1, AS1.1 and AG1.1 URI Calculations Fuel Building Exhaust Vent RMS 0 RE5A - General Emergency Dose Assessment River Bend Thursday, March 8, 2011121:56 Method: Derailed Assessment - Monitored Release Rele03e Pathway; <RCS> <Supp Pool> <Rx Bldg> <Fuel Bld!J> "'Filter> <FB Exh> <Env,, PRF: 1.60E-05 lb Bldg HUT: ="' 2 Hours Supp Pool St.irus*"' Suboool<Hl Aux RW Tum FB HUT*=< 2 Hour.; FB/RW Fi!11!r = WC!!lwtg SBGT Fillet: = NIA. Source Term: Reactor Core Accident - Clad Time After SID (hh:mm): 1 :00 Release Duration (hh:mm): 1:00 ETE (hh:mm): [N/A I Monrtor: FB WRGM Rafe Reading:s: 7.7SE+08 uCllsec

- oistmce- _. -Expot1t11?t 'l ; ---- Extenlel' : : lnholalfon

\\ £le1:>,o$1tlon ; , I s I \\' -~ l !Ptuine i:>OE'! : - CEDE'

GroundODE (MilclB}

{mruhtL ; L LReml: * ~ '<Reml* '. i: -tRemi.-

s.B.

1..Jl!_f;:+03 -~*~E,41 2.7:2E::02 1.95E-02 0.7 1.15E+03 7.88E-01 3.10E-02 2.22E-02 t.0 8.64E+02 5.88E.01 3.45E-02 2.42E-02 1.5 6.12E+02 4.12E-01 3.21E-02 2.14E-02 2.0 4.76E+02 3.tBE-01 2.71E-02 !.71E-02 3.0 3.93E+02 2.GSE-01 1.76E-02 l.OBE-02 4.0 J.38E+02 2.21E-01 1.56E-02 9.02E-03 5.0 2.85E+02 1.81E-01 1.29E-02 7.09E-03 7.0 1.83E+02 1.20E-01 8.32E-03 4.17E-03 10.0 1.13E+02 7.43E-02 4,73E--03 2.10E-03 Ass~smem Oat.r Results Saved to File: Rive< Bend 10Mile-s.l.lonilore<:i Release 030821118 215M4.URl7 TEOE COE . ' Thyroid {Rem}: :.. (Rem}'

1.00E+OO 6.,21.!=: 02..,,.

8.41E-01 5.00E-02 6.47E-01 3.63E-02 4.66E-01 2.GSE-02 3.62E-01 2.07E-02 2.94E-01 1.51E-02 2.46E-01 1.24E-02 2.01E-01 1.00E-02 1.32E-01 6.61E-03 8.t1E-02 4.16E-03 Prl Lower Wind: From 270°@ 3.7 mph Stability Closs: E Precipllation:,None _:...fvru:untk>h.'Areas'From o.to 10 Mites Circle distan= are 2.. !5 arid 10 mill,s. R A B p D N E M F K J H PAGl!I Excecdad in Designated Arens Iodine 2.30E-02 (0.0%) Reviewed By: Noble Go!! 7.75E+02 {100.0%} Page I of3 River Send I 2.0.1.0 EP-CALC-GGNS-1701 Page 21 of28 Revision 0 AA1.1, AS1.1 and AG1.1 URI Calculations Fuel Building Exhaust Vent RMS-RE5A - Site Area Emergency Dose Assessment River Bend Thursday, March 8, 2018 21:59 Method: Detailed Asseflsment

Monitored Release Relea,e Pathway: <RCS> <Supp Pool> <Rx Bldg> <Fuel Bldg> <filter> <FB E.idl> <EnV>

Rx Bldg HUT.:< 2 Hours Supp Pool Status:: Subcooled Aux RW Turn FB HUT:=< 2 Hours PR£': 1.00E..QS FBIRW Filter.,. Womng SBGT Filtc,r. " NIA Source Tel'TT!: Reactor Core Accident

Clad Time After SID (hh:mmJ: 1 :00 Release Duration (hh:mm): 1:00 ETE (hh:mm): [NIA J Monitor. FB WRGM Rate Reading::,: 7.75E+07 uCilsec

,Distance. !, El(posure

Jnhzllaoo,c : Deposition'

-*~~'-*

I Gioufal.DOE * -~

: Plume DOE* 1 CEDE

'(M!leis} I

.-.:CRemi

i tmRlhr): I;

{Rem) (Rem) .. i

i.

SB. 1.38E+02 9 ?4E-02 2,I2E_:0_3".,.J,9,SE-{!_3.... 0.7 1.15E+02 7.B8E-02 3.10E-03 2.22E-03 1.0 8.64E+01 5.68E-02 3.45E.03 2.42E-03 1.5 6.12E+01 4.12E-02 321E-03 2.14E.03 2.0 4,76E+01 3.18E-02 2-71E-03 1.71E-03 3.0 3.93E+01 2,65E-02 1.76E-03 1.0BE-03 4,0 3.38E+01 221E-02 1.56E.03 9.02E-04 5.0 2.85E+01 1.81E-02 1.29E.03 7.09E-04 7.0 t.83E+01 1.20E-02 8.32E-04 4.17E-04 10.0 1.13E+01 7.43E-03 4.73E-04 2.10E-04 ASiessment Dau Results SaWcl to File; Rive1 Bern! 10Miles Monitored Release 03082018 215910.URI7

,,TI:OE

.COE (Rem}* 1h)'fO!d tRemJ 1.00E-01 6.24E-03 8.41E-02 5,00E-03 6,47E-02 3.63E-03 4.66E-02 2.65E-03 3.62E-02 2.07E-03 2.94E-02 1.StE-03 2.46E-02 1.24E-03 2.01E-02 1.00E-03 1.32E..Q2 6.61E-04 8.11E-03 4.16E-04 Circle dista=s are 2. 5 and 1 O miles. R A p N M K J Pri lower Wind: From 27D' @ 3.7 mph StobDity Class: E Precipitation: None B D E F H No PAGs Exceeded "'I:_......... *... *.....,._._: __ :.. * *... :.... * ;;;.::*._-,:*.;;-~;;;.-*.. -* c.. 1;;;;.:1.. l!l*e... ific=a;;;.tl;;;;o.;.;;n...

*.;s,..it...

e... 'A.. ra;;.;a;.;,;Em=e;;.;ru.:::;e;;.;n.;.;i:;;:.y.:..:'_'*..;;'.... *.;..;....;;.......,_....;.....;;;.,;:*;;.;*;;;;..,**-I..,,.....,..-,-,....--R_c!eT"",'M-=-=-e=R_,n..,.te_,,s=-1=-=c,.,.1 r_se~c.__ ____ _ Particulate i.20E-04 (0.0%) Iodine 2.30E-03 t0.0%) Reviewed By: Noble Gas 7.75E+01 (100.0%) Page 1 of3 River Bend/ 2D, 1,0 EP-CALC-GGNS-1701 Page 22 of 28 Revision 0 Fuel Building Exhaust Vent RMS~RE5A - Alert Dose Assessment River Bend Method: Detailed Asseiisment - Monitored Release Release P.o:hw11y: <RCS> <Supp Pool> <Rx Bldg> <Fuel Blclg> <Filter> <FB Exh> <En11> Rx Bldg HUT:=< 2 Hours Supp Pool Status: = Subcockd Aux RW Tum FE HUT* =<::?Hours SBGT Filler. = NIA Source Tenn: Reactor Core Accident - Clad Time After SID (hh:nvn ): 1 :OO Release Duration {hh:mm): 1:00 ETE (hh:mm): [NIA I Moni!or: FB WRGM Role Readings: 7.75E+06 uCi4'sec

Dlsbncei,

Depooition ' ;"

ll:OE COE AA1.1, AS1.1 and AG1.1 URI Calculations Thursday, March 8, 2018 22:01 PRF: 1.60E-05 FBIRW Fs'ter = Woo,,-,g Pli Lower Wind: From 270"@ 3.7 mph Stability Closs: E Precipitation: None ,_Ex~ J _!:xt11!!1~.: *:' i:1~~-; ) Gto!Jnd ooe; '. \\. ~' * :?tumeDOE1, *:CEDE-i .lltyt1.)ld ' Cin:le distances are 2. 5 and 10 miles. ,,,Miie;}, (mRJlir} .. fRemF '.J i.,<Reml:.

(Rein)

'.' tReml (RemL.. S.B. 1.38E+01 9.54E-03 2.72E-04 . 1,95E:Q4_ " - 1.00E-02 6.~4E-04 A R 8 0.7 1.15E+01 7.B8E-03 3.10E-04 2.22E-04 8.41E-03 5.00E-04 1.0 8.64E+OO 5.B8E.03 3.45E-04 2.42E-04 6.47E-03 3.63E-04 1.5 6.12E+OO 4.12E.03 321E-04 2.14E-04 4.66E-03 2.65E-04 2.0 4.76E+OO 3.18E-03 2.71E-04 1.71E-04 3.62E-03 2.07E-04 p D 3.0 3.93E+OO 2.SSE-03 1.76E-04 1.0BE-04 2.94E-03 1.51E-04 4.0 3.38E+OO 2.21E-03 1.56E-04 0.00E+OO 2.37E-03 124E-04 5.0 2.BSE+OO 1.B1E..03 1.29E-04 D.OOE+OO 1.94E-03 1.00E-04 7.0 1.83E+OO 1.20E-03 O.OOE*OO O.OOE+OO 1.20E-03 O.OOE+OO N E 10.0 1.13E+OO 7.43E-04 O.OOE+OO O.OOE+OO 7.43E-04 O.OOE+OO Asseumenl Oat.I Resul!5 SaV'lld IQ File: Riv~ Bend tOMiles Monnored Release 03082018 220IOO.UR17 M F K J No PAGB Exceeded Iodine RevieWed By: Noble Gos Rrl<!r BMd / 2.0 1.0 EP-CALC-GGNS-1701 Page 23 of28 Revision O AA1.1, AS1.1 and AG1.1 URI Calculations Fuel Building Exhaust Vent RMS-RE5B - Alert Dose Assessment River Bend Thursday, Mnrch 8, 2018 22:04 Method: Detailed A1111e1111ment - Monitored Release Release Pathway: <RCS> <Supp P~> <Rx Bldg> <Fuel Bldg> <Filter> <FB Exh> <EnV> PRF: 1.60E-05 Rx Bldg HUT:,. < 2 Hours Supp Pool Slatus: = Subooel&d Aux RW TurtJ FB HITT:"'< 2 Hours FB/RW Filter = Wori:ing SBGT Filter. = ti/A Source Term: Reactor Core Accident - Clad Tlme Aller SID {hh;mm); 1 :OD Release Duration (hh:mmJ: 1:00 ETE (hh:rnm}: [NIA l Monitor: FB Gas Readings: 1.72E-01 uClfcc 11Jlmnc1L*: Ex~:,. gxte01DI ;* I i lnllaltltkm.. Deposlllon ; J. \\. cEbE Grounil ooei ~! } Rnte" ~ope! (Mlies}: -- fmR/hrJ. '. i _.(Rem},_ I' . I -(Rem>....i

._.(Rem)

~--"'- -SB 1.4SE+OO 1.00E-t!3 O.OOE+OO O.OOE+-00 0.7 1.21E+OO 8.28E-n4 O.OOE+OO O.OOE+OO 1.0 9.08E-01 6.12E-04 O.OOE+OO 0.00E+OO 1.5 6.40E-01 4.28E-n4 O.OOE+OO O.OOE+OO 2.0 4.9-6E-01 3.33E-n4 O.OOE+OO O.OOE+OO 3.0 4.12E-01 2.78E-04 O.OOE+OO OOOE+OO 4.0 3.54E-01 2.32E-04 O.OOE+OO O.OOE+OO 5.0 2.98E-01 1.B9E-04 O.OOE+OO 0.00E+OO 7.0 1.91E-01 U6E-04 O.OOE... 00 O.OOE+OO 10.0 1.iBE-01 O.OOE+OO o.ooe... oo 0.00E+OO Assessment Data HesUltt. Sawd ID File: River Bend lOMiles l.lonilored Relea~ 03082018 220435.URl7 -TEOE

(Remi 1.@E-Q3 8.28E-04 6.12E-04 4.2BE-04 3.33E-04 2.78E-04 2.3:?E-04 1.89E-04 1.26E-04 OOOE+OO Flowrnle: 10000 CFM

_COE~ Prilower Wind: From 210* @ 3.7 mph Stnbility Clas11: E PrecipUation: None Thyroid* Cin:le distance-,; are 2. 5 and 10 miles. (RemJ 0 OOE+OO A R B O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO p D O.OOE+OO O.OOE-<00 O.OOE+OO O.OOE+OO N E 0 OOE+OO M F K J H No PAGs Exceeded -.. _***_!_.*_:c_b_s_s_if_lca_tlom ___ :V __ llf_ldo_te_Of.J.1=--lns t._Emerg_...._~ ........... 'A_c_tf_o_n_t_*eve_*_1_u_*_*_*_--_--___ __.l 1=-...,,..-,----R-el.,..e_as..,,.,,.e,,_.R.,,11.,..1e...,m,...t,,,C.,.lf_s_~_._ ____ _ Particul11te 1.25E-tl6 !0.0%1 Iodine -.41 -0 (0.0%) Reviewed By: Noble Gos B.12E-01 {100.0%) Page 1 of3 R:ver&nd 12.0.1.0 EP-CALC-GGNS-1701 Page 24 of28 Revision 0 AA1.1, AS1.1 and AG1.1 URI Calculations Radwaste Building Exhaust Vent RMS-REGA - General Emergency Dose Assessment River Bend Thursday, Morch 8, 2018 22:10 Method; Detailed Assessment - Monitored Release Relense f'rsthwoy: <RCS> <Supp Pool> <Rx Bldg> <RW Bldg> < Filter> <RW Exh> <EnV> PRF; 1.60E-05 R* Bldg HUT: = < 2 Hours Supp Pool Sta!lJs* = Subcooled Aux RW Tun, FB HUT: = < 2 Hours FBIRW Filter.= WoliiillJ SBGT Filler: = NIA Source Term: Reactor Core Accident - Clad Time After SID (ilh:mm i: 1 :00 Release Duration (hh:mm): 1:00 ETE (hh:mm): [NIA l Monitor: RW WRGM Rate Reodingll: 8.03E+08 uCifsec Dffitlnce,

.: ExJ)OOl.llli.

Bdemal

. lnllDbtlon

, Deposition. t ! i Pluf.Tle ODE; ' :ceor::*, 'Groliild EIDE'. Rote*

: (M~Ml

{rnR!hr)_.. : ; CRemL.:.... lRem}

(Rem). S.B, 1.38E+03 9.53_E_:fil_ ~'-~ 1.96E-02 0.7 1.16E+03 7.92E-01 3.10E-02 2.22E.02 1.0 8.68E+02 5.88E-01 3.44E-02 2.41E.02 1.5 6.16E+02 4.12E-01 3.19E-02 2.13E-02 2.0 4.72E+02 3.18E-01 2.70E-02 1.70E-02 3.0 3.92E+02 2.66E-01 1.69E-02 t.07E-02 4.0 3.30E+02 2.21E-01 1.53E-02 S.08E-03 5.0 2.79E+02 1.87E-01 1.33E-02 7 53E-03 7.0 1.92E+02 1.2SE-01 8.B4E-03 4.59E-03 10.0 1.27E+02 8.31E-02 5.SOE-03 2.SSE-03 Assessment ala esults Sall'f.ld IC F-.1e: River Bend tOMihes Monilo<ed Release 03082018 221014.URl7 Reviewed By: EP-CALC-GGNS-1701 TEDE. j COE.-. CRemJ Thyroid . *.: (RMll _*

. 1.00E+OO 6.27E-O_L 8.4SE-01 5,00E-02 6.47E-01 3.61E-02 4.65E-01 2.63E-02 362E-01 2.06E-02 2.93E-01 1.SOE-02 2.45E-01 123E-02 208E-01 1.0JE-02 DBE-01 6.88E-03 9,12E-02 4.65E-03 Page I of3 Page 25 of28 Cin;le distances are 2.. 5 and ID ml!h.

R A p N M K J Prilower Wind: From 270'@ 3.7 mph Stability Class: E Prectpitntion: None B D e F H PAGe Exceeded in Designatm:I Arens Iodine Noble Gas Rr#er llffld 12.0. 1.0 Revision O AA1.1, AS1.1 and AG1.1 URI Calculations Radwaste Building Exhaust Vent RMS-REGA - Site Area Emer9.encv_ Dose Assessment River Bend Thursday, March n, 2018 22:14 Method: Detailed Assessment - Monitored Release Releose Palhway: <RCS> <Supp Poot> <Rx Bldg> <RW Bldg> < Filter> <RW Exh> <EnV> Rx Bldg HUT* = < 2 Hours Supp Pool Status: = Subc:ool<?d Aux RW Tl.llb FB HUT:=< 2 HOUl!i PRF: 1.60E-05 FBIRW Filler: = Worung SBGT Filler; " NIA Source Term: Reactor Core Accident - Clad Time AHerS/0 (hh:mm): 1:00 ReleoseOuration (hh:mm): 1:00 ETE (hh:mm); [NIA] Monitor. RW WRGM Rate Reading!!: 8.031;+07 uCll11ec

.:Dl::lnnce. '-.El!pasun::*;,~nl:_.. lnhtlfatlon. ; /'Deposition.:

~ i *. :.~~~~,,,;

q~o~* i Ground DOE*

Plume DOE (Ml~}.... AmRlhrt

'.. " (Remi.*

{Rem}

i I! i~in,* - S.B. 1.38E+02 9.53E-02 2.74E-03 1.96E.03 0.7 1.16E+02 7.92E-02 3.10E-03 2.22E-03 1.0 8.6BE+01 5.88E.()2 3.44E-03 2.41E-03 1.5 6.16E+01 4.12E-02 3.19E-03 2.13E-03 2.0 4.72E+01 3.18E-02 2.70E-03 1.70E-03 3.0 3.92E+01 2.66E-02 1.69E-03 1.07E-03 4.0 3.30E+01 2.21E-02 1.53E-03 9.0BE-04 5.0 2.79E+01 1.67E--02 1.33E-03 7.53E-04 7.0 1.92E+01 1.:!SE-02 {t.B4E-04 4.SSE-04 10.0 1.27E+01 8.31E-03 5.SOE-04 2.SSE-04 AsSHsmen1 Data liesults Saved 10 Fikt: River Bend TOMi!H Mooi!o<ed Release 03082018 221434.URl7 TI=t;)E. COE l Thyroi,rl,. '.,(Rem}*. : (Rem)' 1.00E-01 6.27E-03 8.45E-02 5.00E-03 6.47E-02 3.61E-03 4.65E-02 2.63E-03 3.62E-02 2.0GE-03 2.93E-02 1.SOE-03 2.45E-02 1.23E-03 2.0SE-02 1.0JE-03 1.:J.aE-02 6.68E-04 9.'t2E-0.3 4.6SE-04 Cirde distances are 2. 5 and 10 miles. R A p N M K J Po Lower Wind: From 270" @ 3] mph StobPity Class: E Precipitation: None B D E F H No PAGe Exceeded .. I,_::._._**-....... ----* _:-..... _:_.~... ~.--~ _c_1a_a_sffi_1_ca_t_io_n_: :_S_it_e_*A_re_a_Em em..,_e_nc..,Y... * *""_}_'.::.*:.... _.-_________.....,...........,..:I._ _____ R..;.e;;,.le_1U1 e_R __ a_tes___,4'--C..,..1 l_sec_.__ ____ --.i Particulate 1.24E-04 (0.0%) Iodine 2.39E-03 [0.0 } Reviewed By; Noble Gos 6.03E+Ot {100.0%) P.-.gi. I ofJ EP-CALC-GGNS-1701 Page 26 of28 Revision 0 AA1.1, AS1.1 and AG1.1 URI Calculations Radwaste Building Exhaust Vent RMS-RESA - Alert Dose Assessment River Bend Thursday, Morch 8, 2018 22:16 Method: Detoiled AsseHment. Monitored Release ReleMe Pathway: <RCS,. <Supp Pool> <Rx Bldg> <RW Bldg> < Filler> <RW Exh,. <Env:- Rll Bldg HUT: = < 2 Hours Supp Pool Sblus: = Subcooled Aux mN Tutb FB HUT:=< 2 Hours PRF: 1.G{IE-05 FBIRW Filter. = WOtl:itv,; SBGT Filler: "' WA Source Tellll: Reactor Core Accident - Clad Time AfterS/D (hh:mm): 1:00 Release Duration (hh:mm): 1:00 ETE {hh:mm): [NIA] Monitor: RW WRGM Ra!e Readings: 8,03E+06 uCi/sec Expo,ure, i, External; :,"*lnhtmltion *, Deposition i

TEDE *

, *Riite * : ;Pfuine r.ioe:,, ceoe *

Gfuund. bDE

' *...en: Rem

R ***: ** **("'*m'

,;Rem* *i,

.1111n,ur)'...,*.,

C t.::1,:.... :', em):. 1 1.38E+01 9.S3E-03 2.74E--04 1.96E-04 1.00E-02 0.7 1.16E+01 7.92E-03 3.10E-04 2.22E-04 8.45E-03 1.. 0 8.68E+OO 5.88E-03 3.. 44E-04 2.41E-04 6.47E-03 1.5 6.16E+OO 4.12E-03 3.19E-04 2.13E-04 4.6SE.03 2.0 4,72E+OO 3.18E-03 2.70E-04 UOE-04 3.62E-03 3.0 3.92E+OO 2.66E-03 1.69E-04 1.07E-04 293E-03 4.0 3,30E+OO 2.21E-03 1.53E-04 O.OOE+OO 2.36E-D3 5,0 2.79E+OO 1.67E-03 1.33E-04 0.00E+OO 2.00E-03 7.0 1.92E+OO 1.25E-03 O.OOE+OO O.OOE+OO 1.25E-03 10.0 1.27E+OO B.31E-04 0.00E+OO O.OOE+OO B.31E-04 Assessment Data RliSLdt>> ~ to File; River Bend 10Miles Llorutored Release 03082!l18 221013.URJ7 COE Thyroid !Remf 6.27E-04 5.00E-04 J.61E-04 2.63E-04 2.06E-04 1.SOE-04 1.23E-04 1.03E-04 O.OOE+OO 0.00E+OO Prilower Wind: From 210*@ 3.7 mph Stability Class: E Precipitation: None .. Evacuation'Areaiffrom O.to,10.ll.41Jes Circle distances are 2. 5 and 10 miles. R A B p D N E M F K J H Ho PAGe Exceeded I._,_.,. ____ ::_ ... -_.. _:_._*. ~-:~.... *~_C_IM_s_lllct! tlon_:_.*v_n1_1ao_te_u __ ga._ln_111_l:_Em_ergen ...... i..... cv .... A_cffon -Le_~ ... _*_.~_. -___ __,* 11=-...,,......,...,----'R-'-ele=r-c,:ll1'.l~c=R~a'=te;..,;s~t==C~i t.,.:sec:.;c.;;:.)'-'------1 PDrtiCUlllte t.24E--05 (0.0%) Iodine 2.39E-04 (0.0%) Reviewed By: Noble Gos 8.0JE+OO (100.0%) Page 1 of3 EP-CALC-GGNS-1701 Page 27 of 28 Revision 0 AA1.1, AS1.1 and AG1.1 URI Calculations Radwaste Building Exhaust Vent RMS-REGS - Alert Dose Assessment River Bend Method: Demiled Assessment - Monitored Rele:ise Release Pathway; <RCS> <Supp Pool> <Rx Bldg> <RW Bldg> < FitteP <RW Exh> <Env> Rx Bldg HUT = < 2 Hours Supp Pool Status.= Subcooled Aux RW Turb FB HUT*=< 2 Hoors S8GT Ftller = NIA Source Term: Reactor Core Acadenl

Clad Time After SID (hh:mm}: 1 :00 Release Duratiori (hh:mm): 1:00 ETE (hh:mm): [NIA J Monitor:. RW Gas Readings: 2.l2E-01 uCi/cc

':,tli$fice* *, j Exposure" ; :8ctemal. :. lnhabtion. ' *. Deposition: '. Flowrate 80400 CFM JEDE COE-. Mond:ty, M:trch 12. 201813:25 PRF: 1.60E-05 FB/RW Filter: = Working Pri Lower Wind: From 270° @3.7 mph Stabiflty Class. E Precipitation: None

1

Rate 1Piume*ooE'. **i::Eof

erou'itti obi::{
w Tl','rOK!.

Circle distances am 2. 5 :iml 10 miles. Miies ';. mR/lit :. Rem . (Rem*

Ri:til.. l i. Reh,

., Rem~ S.B. 1.39E+01 9.53E-03 2.74E-04 1.96E-04 1.Q9E-02 6.29E-04 A R B 0.7 1.16E+01 7.92E-03 3.10E-04 2.22E-04 B.45E-03 5.00E-04 1.0 8.68E+OO 5.88E-03 3.44E-04 2.41E-04 6.47E-03 3.62E-04 1.5 6.16E+OO 4.12E-03 3.19E-04 2.13E-04 4.65E-03 2.64E-04 2.0 4.72E+OO 3.18E-03 2.70E--04 1.70E-04 3.62E-03 206E-04 p D 3.0 3.92E+OO 2.66E-03 1.69E-04 1.07E-04 2.93E-03 1.51E-04 4.0 3.30E+OO 2.21E-03 1.53E-04 O.OOE+OO 2.36E-03 1.23E-04 5.0 2.79E+OO 1.87E-03 1.33E-04 O.OOE+OO 2.00E-03 1.04E-04 7.0 1.92E+OO 1.25E-03 O.OOE+OO O.OOE+OO 1.25E-03 O.OOE+OO N E 10.0 127E+OO 8.31E-04 O.OOE+OO O.OOE+OO B.31E-04 O.OOE+OO Assessment Data Results Saved lo Ftle: River Bend IOMiles Mon~ored Release 03122018 132552.URIT M F K J H No PAGs Exceeded Reviewed By: P:ige 1 of 3 RrmBEn0/2.D.1.0 EP-CALC-GGNS-1701 Page 28 of 28 Revision 0}}

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