ML14007A086

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Response to NRC Request for Additional Information, Dated November 21, 2013, Related to the Byron and Braidwood Stations, Units 1 and 2 License Renewal Application, Byron Station Applicant'S Environmental Report. Part 6 of 15
ML14007A086
Person / Time
Site: Byron, Braidwood  Constellation icon.png
Issue date: 12/09/2013
From:
Exelon Generation Co, Exelon Nuclear
To:
Office of Nuclear Reactor Regulation
Shared Package
ML14007A078 List:
References
RS-13-282
Download: ML14007A086 (64)
v • d • e


Text

Exelon.Exelon Generation Company. LLC www.exeloncorp.com Nuclear Byron Station 4450 North German Church Road Byron. IL 61010-9794 October 20, 2011 LTR: BYRON 2011-0147 File: 2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring Report P in accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number IL0048313, issued January 24, 2011, we are submitting the Discharge Monitoring Report for Byron Station, Units 1 and 2. This report covers the period of September 1,2011 through September 30, 2011.If there are any questions regarding this report, please contact Ms. Zoe Cox, Environmental/Radwaste Supervisor, at (815) 406-3035.Respectfully, Bra-!dleyZ .Aam Plant Manager Byron Nuclear Generating Station BJA/ZC/ca Attachments PEATE NMA 6A HAM Em~m Gadnifon Co.. LWC ADRN 4300 WbiW Rood Wusruw*. L SOW PMS.NY BrM~ Mxbw Porm S~an LOCATION 44N NoM Omwm Chr RoAW Bywmn L 01010 NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPESOE)LO 3 A014 (U PEFA- MAO-OKMNME

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There were no steam generator chemical cleaning solutions (or associated rnses) containing hydrazine discharged to the Cooling System Blowdown during the month of September 2011.TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS: 1. Sodium Hypochlonte was used this month. Bromine compounds were not used this month.2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.3. Flow existed through this outfall 30 of 30 days.4. Per Special Condition 24 the influent from the Rock River and effluent from Outfall001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value was 8.3 mg/L on 09/06/2011.

The CWBD TSS value was 21.9 mg/L on 09/06/2011.

5. Rock River flow for September 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in September 2011. (Special Condition 15).C:ADocuments and Settings\bynzc\Desktop\201 1 Reports\September 201 \September 2011 ATTACHOI.doc Exelon.Exelon Ceneration Company. LUC www.exeloncorp corn NuClear Byron Station 44S0 North German Church Road Byron. It 61010-9794 November 17,2011 LTR: BYRON 2011-0164 File: 2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring Report' In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number IL0048313, issued January 24, 2011, we are submitting the Discharge Monitoring Report for Byron Station, Units 1 and 2. This report covers the period of October 1,2011 through October 31, 2011.If there are any questions regarding this report, please contact Ms. Zoe Cox, Environmental/Radwaste Supervisor, at (815) 406-3035.Respectfully, Bradle J. Adams Plant Manager Byron Nuclear Generating Station BJAIZC/ca Afttachments N4ATOMAL POLLUTANT DOCHARGE EMANATION SYSTWI (NPDES)DMXVU W 0AN URPOT O 61010-PEWrTEE -AEOA ft" Exmo Gmnsalon 036 LLC AMS 4300Whis PAW WI"' -- -f L 0 0 K4"~bI I MSU1S I Pwwwuý*II.AM-0 I.inaa. GiNOMATE WAS=(MA)NO msana4Mm PAOLITV arm HucwP Stwo n I WII LOGCI 4490 momS Osman chuc PAW mUlS1 1Ul WPM ~L 0101 MKGDM i Mm. I&A!u u II -I I

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M~lOMA POLLUTANT OOSCHARGE SJMNATflON SYSTWA (NOEB)ONCMa -wa of~a-EOTE HAEAoM"M EmWa -mma Co..LWC mý 4300k P~iU Wwiwrom. SONI FAC~JW "~a Ik~iW P&M &ASn WJOCAWI 4460 N GenMMChWOPAo WImN^ L 61401 0MM. UEP Oot MAWiml 61010 I-94M wmiM, 0m U -- --IwBD-F-w 61'OinA1 ~MeOW 5MW~-1 ... MO ~u*-I *.li il M OIMCIIAJM ATTACHMENT TO 0 COOLING SYSTEM BLOWDOWN (Outfall 001-0)DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 October 2011 Page 1 of 2 MONITORING DATA: CWBD Rock River DATE Temperatum re wFlow t IF mgdat 10/01/2011 77.0 13.09 5260 10/02/2011 77.2 12.19 5100 10/03/2011 81.7 10.36 4810 10/04/2011 81.3 17.74 4630 10/05/2011 85.5 9.18 4480 10/06/2011 86.0 13.94 4120 10/07/2011 86.0 15.53 4040 10/08/2011 82.3 14.58 3770 10/09/2011 82.8 13.33 3440 10/10/2011 81.7 13.35 3480 10/11/2011 86.0 11.53 3570 10/12=2011 87.0 17.26 3730 10/13/2011 83.6 17.51 3990 10/14/2011 81.0 18.36 440 10/15/2011 79.0 22.99 4350 10/16/2011 80.6 18.46 4100 10/17/2011 79.5 13.73 4050 10/18/2011 78.0 18.15 4100 10/19/2011 74.7 8.95 3990 10/2012011 74.8 30.51 4300 10/21/2011 77.5 16.14 4240 10/22/2011 77.5 23.95 4290 10/23/2011 77.0 16.91 4450 10/24/2011 82.0 14.64 4300 10/25/2011 79.8 18.80 4120 10/26/2011 81.1 18.91 4000 10/2712011 76.6 18.46 4070 10/28/2011 74.8 17.95 4010 10/29/2011 76.4 24.98 4000 10/3012011 76.4 19.19 3870 10/31/2011 74.8 11.95 3760 0 K:ABYR_CH\BYRON.DB\CIerk\Monthly Discharge Monitor Rpt\2011 Reports\October 201 r\October 2011 ATrACHOI.doc ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 October 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of October 2011.TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS: 1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.3. Flow existed through this outfal 31 of 31 days.4. Per Special Condition 24 the Influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value was 19.2 mg/L on 10/04/2011.

The CWBD TSS value was 8.4 mg/L on 10/04/2011.

5. Rock River flow for October 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in October 2011. (Special Condition 15).K:\BYRCH\BYRON.DB\Clerk\Monthly Discharge Monitor Rpt\2011 Reports\October 201 1\October 2011 ATTACH01 .doc Exelkn.Exelo" Genieat°on Company, LLC www.eelooncorpmcor NuClear By"n Station N d a 4450 North German Church Road Byron. IL 61010-9794 December 13,2011 LTR: BYRON 2011-0170 File: 2.09.0411 1.10.0101 Illinois Environentla Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring Report In accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number S IL0048313, Issued January 24, 2011, we are submitting the Discharge Monitoring Report for Byron Station, Units I and 2. This report covers the period of November 1,2011 through November 30, 2011.If there are any questions regarding this report, please contact Ms. Zoo Cox, Environmental/Radwaste Supervisor, at (815) 406-3035.Respectfully, T: 9 J. Tulon Vice Pres~ent BrnNuclear Generating Station TJTfZC1ca Attachments NAIIONAL POWJUTANT DOWMARE B~fAflOM SYSTSOWM(PE) mwatmm -m mWom-e~ I NMEOD NAME tMMn Oudo Om ()X.L*smý 4300W fbad Wanwnvs.LUUU I Lmm$1 ~M141 1 mICHRWM I NM-talli)DinA mlin IERAU AIE 01)-U-I -~ I I FAMWi op "jwfw t LOCATON 4460 NoM Osimi Chm oAed-8PMA L 61010 I-um I Tq 1iimo1 I**
  • 0 oOJ~t mm...i i i HA11OIAL PCWILUTA~

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=u 2. ~ N f io f oe 8 wImc Wa or Ge~AdsNmcjMm mMdi~ --pg audsi~ gd EbbPA~m3 IwMs~n ub uww~uiv so -m mboun WNamiLmd 2/M AfI Ah mo q_1~w0~Psluon m~swd 1 W~1A NATIONA POLUJTANT DISCHARGE 5J&UNATION SYSTEMI (WODES)NCMONM A -w P"-EUTE mAEAOIS HMAN a m nms. m Cck LW-O 4300 ~i Road Wowwk I $ON I s I PNNWWAýDOCHAFOEIVAMM i m man aW C00 NArn camel)SONWAIM fANuw SAWN 61010 l FACEJIT DPW HudW OWN 8-s 0 1i a -i LOCAUU MI50 NwM Owme hUO PoAW I ow SWi. L. 01010-M ý Pl i1mv1v a M NCIHAMrl ..!* I ATTACHMENT TO COOUNG SYSTEM BLOWDOWN (OuffalI 001-0)DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 November 2011 Page 1 of 2 MONITORING DATA:.CWCWB D Fow Rock River DATE Temperature CW D Flow deg IF mgda 11/01/2011 80.0 18.07 4,450 11/02/2011 79.6 18.25 4,230 11/0312011 75.8 18.56 4,770 11/04/2011 74.8 20.05 5,160 11/05/2011 82.8 24.45 5,290 11/06/2011 82.8 19.83 5,210 11/07/2011 76.7 16.28 5,120 11/08/2011 76.1 19.41 5,370 11/09/2011 72.4 18.20 7,990 11/10/2011 70.9 14.63 11,900 11/11/2011 78.8 20.01 12,000 11/12/2011 82.0 24.94 11,100 11/13/2011 76.0 19.79 10,400 11/14/2011 77.8 14.37 9,630 11/15/2011 77.8 20.01 9,230 11/16/2011 67.3 20.00 8,730 11/17/2011 69.4 21.97 8,120 11/18/2011 74.0 18.99 7850 11/19/2011 76.0 22.58 7,580 11/20/2011 70.7 20.16 7,370 11M21/2011 73.8 14.46 7,260 11/22(2011 73.8 19.13 7,070 11/23/2011 73.2 19.31 7,010 11/24/2011 78.0 22.61 6,970 11/25/2011 79.4 18.63 6,790 11/2612011 79.4 23.72 6,700 11/27/2011 70.8 19.91 6,990 11/28/2011 70.3 15.75 7,340 11/29/2011 70.3 17.87 7,320 11/30/2011 70.5 20.17 7,210 K:\BYR_CH\BYRON.DB\Clerk\Monthly Discharge Monitor Rpt\2011 Reports\November 201 1\November 2011 ATTACHO0 .doc ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)DISCHARGE MONITORING REPORT For Exelon Byron Station Permit 1L0048313 November 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of November 2011.TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS: 1. Sodium Hypochlorlte was used this month. Bromine compounds were not used this month.2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine In this month.3. Flow existed through this outfall 30 of 30 days.4. Per Special Condition 24 the influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value was 14.3 mg/L on 11/07/2011.

The CWBD TSS value was 9.3 mg/L on 11/07/2011.

5. Rock River flow for November 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in November 2011. (Special Condition 15).K:\BYR_CH\BYRON.DB\Clerk\Monthly Discharge Monitor Rpt\201 I Reports\November 201 November 2011 ATTACHO I.doc

/

Exelkn.Exelon Generation Company, LLC www.exeloncorp com Byron Stationea 4450 North German Church Road Byron. IL 61oio"794 January 25, 2012 LTR: BYRON 2012-0014 File: 2.09.0411 1.10.0101 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring Report SIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number 1L0048313, Issued January 24,2011, we are submitting the Discharge Monitoring Report for Byron Station, Units 1 and 2. This report covers the period of December 1, 2011 through December 31, 2011.Special Condition 14 of the NPDES permit requires the station to weigh the copper anodes at the end of the zebra mussel control season and to Include the total mass of copper used In the discharge monitoring report The zebra mussel copper ion skids were shutdown on December 5, 2011. The anodes of the OA copper ion skid were removed and weighed on December 29, 2011. The anodes of the OB copper ion skdd were removed and weighed on December 29, 2011. The total mass of copper used for zebra mussel control was 94 pounds.If there are any questions regarding this report, please contact Ms. Zoe Cox, EnvironmentalRwaste Supervisor, at (815) 406-3035.Respectfully, T1~h J. Tuion SiW'VIce President Byron Nuclear Generating Station TJTIZCVca Attachments NAflNM. POLLUTANT DISCHARGE BJMINATION SYSTEM (NPES)DWM~MMm~rMwPAPOT

wcoo 61010 PEOAEHAwADFM NAM Einln Gmgvala C0. LLW-DPA 4300 Wku PoAW WagerW6. L SM] mUol)I ILooee6 3*1 AM-0 I PEFrNF i I ilimnUlO i, ioo aimiwAU fAMOMMTE WA61 (=A1)MR MR -a LOCAlIW 45 HOM NmM Chw Road rw Symn L 61010 mVvw inumi I I mwv1771 =l I IVJVANI I* ** O 0m0cH1ARG M .----m+--Ii l NATKA POU.WFANT D690HARGE RAUNA11O SYSTE (NPOES)m00Ai mMOMXM wAOR P" PEM iTE NAMrn NAM Exeln nQsnua mO LLW AD06 40V PoAW WaNNuIwi L OMS PACLU.I Bion NOWa PWM S~WW LOCAUO 4450 NOM Gwf Chua Racd inVran L 61010 1-dlq WpooO uNAM (lUS @)61010! mS I I A014 I I BASMS13 i OWWWOUaam I I -i-!ll lII " a-pomapo mIom I I inwvw PROM I ol I " I il i-U1-"4'I I ini-li I*. *~ msO 11COIA I 0A03 I 0.115 1 3 I -I -I -1 0 1 125 I cN I I i I I I-I I I I f I I-I I I I I I I DATE NATIONA POLLUTANT WOSSOIRAEWJIATION SYST1i (NPES)DWmAmrNffW4M w p" FERrTV NABDDI NMAU En1m Q -mla CID LWC ADOSVI 4300 VWdW Road Warnuwik LUISOS LS 3 I mOCHGEInwE I-N~mONWOOD MAJOR (0MIo1 61010 Ui gwno v I -IMON FAJTV Sym utw tft owgr Slean M~-OAO MW1 NOM Gawo Ch~ Road PO10=Bymn. L 61010 SIP ojljl PNTUUT F Um ..1.I I ........ I 1=1,011 I* I I -I -I -I*m I -I? 1 12 1 0 1 OR I I .I I11 I 0,13 S1- I I K I 9o I 4t I A I I I I --I* I -I I -I -°-101 135 1 dol I I I I I I --r I I I I I I I I I DAlE NATKONA POWJTANT DISCHARM E BiATIOt4 SYSTEM (NPOES)DUSMMAMG IOWffOMIG MW MD) -No" p COOL.61010 PERaTTEE NALWM RS NAMS Eim~n Genmanw Co., LLC AMM 4300 WkftM Reed Wervwwls L OM FACMJY By=m Nuftw Pom SWim LOCAIMO 4460 NoM f Gwm hmh PQ LuWMi I- ON4 IL46M (16f01)I DECmAnG IU a ----nI O wwIP (roinmc)I -moff ITJ I maw I --W,- Ii 1--m1i I I ljLr1/U11 I ,&0NO 01CIL" 1..* I uw ......

F wwsn -11006 UJ LOMlIM 4460 NoMQw Gshwc Road 3FsM.L 61010 ATTRt Z. 0OUN W=NLATKOMA POLUMANT DOCKARGE SAMNATION SYSTBI (WME)MWA O M PAP Oft LAOSU3 C0140 pffwrý mcawý I rm ml m-"1-m PN Mmt I I -ininqUPCOOUE 61010***NO 0ICIARI I.,,,,.m,. I'-v-f If I Tol ....... I)1 1IT "T1 1 I I II PARnMEM alAM ONde LO alAM ONONOMUMN0 inONm s lbs s Pa~a ~ ~lUA OFPSSWE ____________OF I> 'vOVA MAr M n-W T MU WL#MA1ION OF MW 1EPA PlM3.301 (sv 0%S)PmWlO~fmsmwi boen CIL U. ME NATONAL POU.UTANT DISCWAE &IANATION SYSTEM (MNES)mmmARMNowrM dPWI (-u")61010 WffTTE NAMADM NAME Enlon OmnemAon CcL. LLW ADUS 4M ~dl Rood Wanmwb~. LOONS FACLETY BY= PFAw PoWA SWM LWAUON 4460 Nsm Gumm Chum Road Syin L. 61010 I E.H i*1 I*-- D-- 01.0] (313301)I lm" umM I lm I MDWA31ETNEA~umT (70 001Db I mmmu ~E U mmvt II iflvzml I 1 I U -, li-,'A'ir-VT 101 1mb2011 I***NO DSOHARGE Cj .* l NAM WMb Gwosonsa Co.. U.CE Wansnvft L 0066r PACIUWV iNuri dwsrPower8-m1 AT1ONN POLUrUANrr DI8CHAReE ELImiNATION sYSTW (NPDEs)wUmcIAIM UONUTOrU REONT (DUR gu mfm ~p ooa 61010 1014S (UI 01)PERI Wzz1 I DUOCHRCE NI NON-OMP Sof A (70RU 001E"Mon L 61010 E AT W=OW PAJK QVOMO OOMalN"OCOCNAM"6FAUM AL AVW ft%ý AILMax O V MU -.S~1O aP T0A10S. umn Oebe.1af. Them midepp M AMA ge e w m ~ h 005 01 mi iu s~ M .6 ai P ami vsm g E m n s1 (R ev 0 1 8 6).Pt 1 e 11_ _ 1 W 1 0 1 0 ILA11NAL POUWAITT DOCHARGE WLANATION SYSTEM (WPOES)-WNNOOMPON mm PERfME NAMrdE D NAM Exan OinfmWmm ck LLC ADNS 4MO0Wbs PoAW Weaumovf L OM FACiLIT ft.mn Mxi Powr 6tan LOCAT 446 HO GNW& 0%00 PfRAW%"k IL 61010 LOOM$i 1 NN4 -I DIOCHAFNE NUýI-m"Zwrno NMm MUUin)61010-~m --I tawmi m laovmi*#NO DOCIIAR .* ,m--l, l NATlONAL PGLWANT DISCHARGE ELMNATION SYSTEM (WOES)OOC mNmNOPA mPPRn O ft Ex"n Gowelon Cc,-D 4300O V Ro a4d Wurgimbt L. OO64MW i .........I KADýI I .......I I I MPdutM.., L 61010 I PEMWN CUd I!I L* W I ........I FACLIff Dpmr H*iew Form ft WICAUON 441 "D U~ Ch PoAN UOY% L. 61010-.- -aI svmLoowýVvvv I iavmi I --- -w , 11MWAl!* mm N NcnI~ :3..-l ......l NATMOAL POLLUTANT DISCNAAGE SAMW4ATION SYSTEM WNOES)onmama mwmro REOTm PERMIIZ AMJDD0 NAME Em"ia Co.i~a LLW ADOANK 4300 WhOW PRoad Waimwft, L. USONl m lý110 I I I I-lif4 I-mmuftW C001 NMAO (amum0)61010 iiiiiii-771-4:1, I I .-I 1111011 MEMOllI I Tof ltimil1 I FACOUJIY *jffef F ~W P fthm LOCATION 4460 Nodh Q0 Oa Fload 3SYM% L. 61010 0%..~bi Y W*I 1*... NO UONCAIIO 1=..* II--It .... lý v ovirw -= -=%,AM=I I~Z I AU*1 .=~7mmmI-- .~ I NO liw ý I A1 11 1 mg OF T t4A11ONA POULLUFANT DOCSHANGE BJMNI~ON SYSTMd 9dPE)OMML41iM IA nMý IMwIp-E~rE AEADM HAMI EMM n Os-Ma co. LWC mý 430OWhdidAU od Waisiw§s.

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      • l ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfail 001-0)DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 December 2011 Page I of 2 MONITORING DATA: WBD CRock River DATE Temperature mC d Flow dogIF aft 12/01/2011 70.5 17.85 6,950 12/02/2011 69.7 17.97 6,740 12/03/2011 75.1 22.63 6,890 12/04/2011 77.3 19.14 7,950 12/05/2011 71.2 14.94 8,770 12/06/2011 69.2 19.60 8,920 12/07/2011 66.0 16.15 8,860 12/08/2011 64.0 18.02 8,590 12/09/2011 65.0 15.65 8,330 12/10/2011 62.0 26.97 7,900 12/11/2011 69.0 19.89 7,430 12/12/2011 72.0 15.04 7,160 12/13/2011 72.5 22.03 7,150 12/14/2011 78.0 17.32 7,500 12/15/2011 82.4 19.73 9,150 12/16/2011 67.2 19.95 10,200 12/17/2011 67.1 26.23 10,300 12/1/2011 67.2 18.08 9,820 12/19/2011 75.7 14.87 9,270 12/20/2011 73.8 21.20 8,820 12/21/2011 72.2 17.28 8,630 12/22/2011 72.2 21.90 8,330 12/23/2011 68.0 19.94 8,110 12/24/2011 67.6 23.29 7,960 12/25/2011 70.5 19.98 7,830 12/26/2011 71.0 14.33 7,600 12/27/2011 78.0 19.43 7,450 12/28/2011 78.0 17.07 7,310 12/29/2011 71.7 19.47 7,240 12/30/2011 72.2 19.94 7,190 12/31/2011 72.2 24.66 7,420 K:\BYR_CHNBYRON.DB\Clerk\Monthly Discharge Monitor Rpt\2011 Reports\December 201 11Decembcr 2011 ATlACHO1.doc ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001-0)DISCHARGE MONITORING REPORT For Exelon Byron Station Permit 1L0048313 December 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of December 2011.TOTAL QUANTITY DISCHARGED:

N/A TOTAL DURATION OF DISCHARGE:

N/A COMMENTS: 1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.3. Flow existed through this outfall 31 of 31 days.4. Per Special Condition 24 the influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value was 26.7 mg/L on 12/05/2011.

The CWBD TSS value was 22.6 mg/L on 12/05/2011.

5. Rock River flow for December 2011 was >2400 cfs therefore daily temperature calculations were not required this month. (Special Condition 12).6. There was no discharge of the 126 Priority Pollutants from coofling tower maintenance chemicals in December 2011. (Special Condition 15).K:\BYRCH\BYRON.DB\CIerk&Monthly Discharge Monitor Rpt\2011 Reports\December 201 lDecember 2011 ATIACHO1.doc of L. Exelen.Exeton Gene.rirnn Company. LLc www exeloflcorp com E xeI en.Byron 5tatkon 4450 North Getman Chutch Road Byron. IL 61010-9794 02/27/12 Illinois Environmental Protection Agency Water Pollution Control Compliance Assurance Section #19 1021 North Grand Avenue East P.O. Box 19276 Springfield, IL 62794-9276

Subject:

December 2011 DMR Attachment to Cooling System Blowdown (Outfall 001-0)NPDES Permit Number H.0048313 As part of this mailing please find the December 2011 DMR Attachment to Cooling System Blowdown (Outfall 001-0) that was inadvertently not sent with the December 2011 DMR mailing in January 2012. If you have any questions regarding this attachment please contact Ms. Zoe Cox, Environmental/Radwaste Supervisor at (815) 406-3035.Respectfuliy, Zoe Cox Environmental/Radwaste Supervisor Byron Nuclear Generating Station ATTACHMENT TO COOUNG SYSTEM SLOWDOWN (Outfall 001-0)DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 December 2011 Page lof 2 MONITORING DATA: SCBW9D Ro Rock RIwr DATE Temperatumre C d Fw fteIF are 12/01/2011 70.5 17.85 6,950 12102=2011 60.7 17.97 6,740 12)0=11 75.1 22.63 6,890 12/04/2011 77.3 19.14 7,950 1205M)011 71.2 14.94 1 8,770 12/6I/11 69.2 19.60 8,920 12107/2011 66.0 16.15 8,860 12/08/2011 64.0 18.02 8,590 1210912D11 65.0 15.65 8,330 12/10/2011 62.0 26.97 7,900 121 V12011 689.0 19.89 7,430 12/12/2011 72.0 15.04 7,160 12/13/2011 72.5 22.03 7,150 12114/2011 78.0 17.32 7,500 12115/2011 82.4 19.73 9_150 12/16/2011 67.2 19.95 10,0D 12117/2011 67.1 26.23 10,300 12/18/2011 67.2 18.98 9_820 12/19/2011 75.7 14.87 9,2M 12/20/2011 73.8 21.20 8,820 12(21/2011 72.2 17.26 8_630 12/22(2011 72.2 21.90 8,330 12(23(2011 68.0 19.94 8,110 1212412011 67.6 23.29 71980 12/25/2011 70.5 19.98 7,830 12(26/2011 71.0 14.33 7,600 12(27/2011 78.0 19.43 7,450 1208M011 78.0 17.07 7,310 12(29/2011 71.7 19.47 7,240 12(30/2011 72.2 19.94 7,190 12(31/2011 72.2 24.66 7,420 K:BYR_CHBYRON.DB\CIerk\Monthy Discharg Monitor Rpt201 I RxpoMts\December 201 1\December 2011 ATrACHOI.doc ATTACHMENT TO COOLING SYSTEM BLOWDOWN (Outfall 001..0)DISCHARGE MONITORING REPORT For Exelon Byron Station Permit IL0048313 December 2011 Page 2 of 2 HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses) containing hydrazine discharged to the Cooling System Blowdown during the month of December 2011.TOTAL QUANTITY DISCHARGED:

NWA TOTAL DURATION OF DISCHARGE:

N/A COMMENTS: 1. Sodium Hypochlorite was used this month. Bromine compounds were not used this month.2. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.3. Flow existed through this outfall 31 of 31 days.4. Per Special Condition 24 the Influent from the Rock River and effluent from Outfall 001-0 was monitored for Total Suspended Solids (TSS) this month. The Rock River TSS value was 26.7 mg1L on 12/05/2011.

The CWBO TSS value was 22.6 mg1L on 12/05/011.

5. Rock River flow for December 2011 was >2400 ds therefore daily temperature calculations were not required this month. (Special Condition 12).6. There was no discharge of the 126 Priority Pollutants from cooling tower maintenance chemicals in December 2011. (Special Condition 15).0 Discharge Monitor RptU01 1 2011 December 2011 ATrACHOI.doc
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