USEPA / AmerenUELabadie Power PlantIntake Structure Site VisitMarch 4, 2009 USEPA IntakeStructure Site Visit2Ameren Corporation General Notes2.4M CustomersFacility locations:IllinoisIowaMissouriPower PlantsNuclear: 1 (MO)Coal: 104 (MO), 6 (IL)Combined Cycle: 1(IL)Hydro: 31 (IA), 2 (MO)CTG – 10 majorMarch 4, 2009 USEPA IntakeStructure Site Visit3Ameren Corporation Fossil and NuclearPower Plant Source WaterbodiesRiverCharacteristicsLarge flowFreshwaterInlandMissouri River – 2Mississippi River – 4Illinois River – 2Wabash River – 1Man-made cooling water lake – 2Long retention timeManaged fisheryMarch 4, 2009 USEPA IntakeStructure Site Visit4Labadie Power Plant General NotesFour identicalsteam-generatingunits: ~2,450 MWBegan Operation:1970-1973Capacity Factor:81.9% (2008)~34% of AmerenUEbaseload generationMarch 4, 2009 USEPA IntakeStructure Site Visit5Labadie Power PlantMissouri River Overview“Big Muddy” – high silt content328 mg/L TSS (average 2007-2008)2,300 mg/L TSS (max, June 2008)Longest river in North AmericaLength: >2,500 milesDrainage area: ~1/6 of North AmericaHistoric high flow events:1993: 750,000 cfs(USGS Herman gauge)2008: 338,000 cfs(USGS Herman gauge)Average flow: ~64,000 cfsUSGS Herman, 2000-2007March 4, 2009 USEPA IntakeStructure Site Visit6Labadie Power PlantIntake Structure DesignLocated at edge of navigation channelWater withdrawal average~818,400gpm (1,823cfs)Design flow = 855,925gpm (1,907cfs)Eight intake bays/pumpsMarch 4, 2009 USEPA IntakeStructure Site Visit7Labadie Power PlantOriginal Traveling Screen & Bar Rack DesignBar rack on 3” center1.2 fps screen approach velocity1/2” mesh screensScreen wash discharge to riverScreen rotationDetermined by∆P“Normal”“Fast”Auto rotation 1/shiftMarch 4, 2009 USEPA IntakeStructure Site Visit8Labadie Power PlantIntake Structure Debris & Icing ImpactsHistoric debris issuesLeaves during Spring and FallTraveling screen damageHistoric icing issuesLoad reduction and outage timeBar rake installation projectLog and other debris removalLower load reduction potentialMarch 4, 2009 USEPA IntakeStructure Site Visit9Labadie Power PlantExisting Intake StructureMarch 4, 2009 USEPA IntakeStructure Site Visit10Labadie Power PlantIntake Structure Cross SectionMarch 4, 2009 USEPA IntakeStructure Site Visit11Labadie Power PlantIntake Structure LocationMarch 4, 2009 USEPA IntakeStructure Site Visit12Labadie Power PlantIntake Structure – Spring 2005March 4, 2009 USEPA IntakeStructure Site Visit13Labadie Power PlantMissouri River Ice & Debris Deflector BargeMarch 4, 2009 USEPA IntakeStructure Site Visit14Labadie Power PlantMissouri River Floating DebrisMarch 4, 2009 USEPA IntakeStructure Site Visit15Labadie Power PlantMissouri River Floating DebrisMarch 4, 2009 USEPA IntakeStructure Site Visit16Labadie Power PlantMissouri River Debris Along BankMarch 4, 2009 USEPA IntakeStructure Site Visit17Labadie Power PlantIntake Structure Debris (note size distribution)March 4, 2009 USEPA IntakeStructure Site Visit18Labadie Power PlantIntake Structure Trash Rack Collected DebrisMarch 4, 2009 USEPA IntakeStructure Site Visit19Labadie Power PlantEddy Collecting Debris On Irregular ShapedTrash Rack FaceMarch 4, 2009 USEPA IntakeStructure Site Visit20Labadie Power PlantIntake Structure Original Irregular ShapedTrash Rack FaceMarch 4, 2009 USEPA IntakeStructure Site Visit21Labadie Power PlantFailed 2B Trash Rack – Winter 2004March 4, 2009 USEPA IntakeStructure Site Visit22Labadie Power PlantFailed Trash Rack RemovalMarch 4, 2009 USEPA IntakeStructure Site Visit23Labadie Power PlantTrash Rack Cleaning Prior to Spring 2006March 4, 2009 USEPA IntakeStructure Site Visit24Labadie Power PlantIntake Structure Debris RemovalMarch 4, 2009 USEPA IntakeStructure Site Visit25Labadie Power PlantWrecked 3B Intake PumpMarch 4, 2009 USEPA IntakeStructure Site Visit26Labadie Power PlantWrecked Intake PumpNote 8” Diameter Shaft Twisted OffMarch 4, 2009 USEPA IntakeStructure Site Visit27Labadie Power PlantIntake Pump 3B Impeller DamageMarch 4, 2009 USEPA IntakeStructure Site Visit28Labadie Power PlantIntake Pump 1A Impeller DamageMarch 4, 2009 USEPA IntakeStructure Site Visit29Labadie Power PlantIntake Pump 1A Failed Shaft Coupling NutMarch 4, 2009 USEPA IntakeStructure Site Visit30Labadie Power PlantLower Intake Face Investigation For TrashRack DesignMarch 4, 2009 USEPA IntakeStructure Site Visit31Labadie Power PlantIntake Underwater Diverter VanesMarch 4, 2009 USEPA IntakeStructure Site Visit32Labadie Power PlantInstallation of New Trash RackSubstructureMarch 4, 2009 USEPA IntakeStructure Site Visit33Labadie Power PlantNew Trash Rack Upper Structure InstallationMarch 4, 2009 USEPA IntakeStructure Site Visit34Labadie Power PlantInstallation of New Trash Rack PanelMarch 4, 2009 USEPA IntakeStructure Site Visit35Labadie Power PlantCompleted Trash Rack – Spring 2006March 4, 2009 USEPA IntakeStructure Site Visit36Labadie Power PlantTraveling Screen Leaf DebrisMarch 4, 2009 USEPA IntakeStructure Site Visit37Labadie Power PlantTraveling Screen Leaf DebrisMarch 4, 2009 USEPA IntakeStructure Site Visit38Labadie Power PlantTrash Rake Cleaner Removed DebrisMarch 4, 2009 USEPA IntakeStructure Site Visit39Labadie Power PlantTrash Rake Cleaner Removed DebrisMarch 4, 2009 USEPA IntakeStructure Site Visit40Labadie Power PlantTrash Rake Cleaning – Note LogMarch 4, 2009 USEPA IntakeStructure Site Visit41Labadie Power PlantTraveling Screen Matted DebrisMarch 4, 2009 USEPA IntakeStructure Site Visit42Labadie Power PlantTraveling Screen 3/8” Mesh – Note PenMarch 4, 2009 USEPA IntakeStructure Site Visit43Labadie Power Plant~2mm Screen – Note PenMarch 4, 2009 USEPA IntakeStructure Site Visit44Labadie Power PlantReplacement Traveling Screen DetailMarch 4, 2009 USEPA IntakeStructure Site Visit45Labadie Power PlantReplacement Traveling Screen DetailMarch 4, 2009 USEPA IntakeStructure Site Visit46Labadie Power PlantIntake Structure Upgrade ProjectTrash rack repair (2003)$50,000Trash rack repair and trash rack cleaner2005-2006$2,900,000Traveling screen replacement (2005-2007)3/8” ScreenRobust design – can be rotated continuously$2,800,000$400,000 additional cost over in-kind replacementCan be retrofitted for installation of potential fish buckets(additional cost)March 4, 2009 USEPA IntakeStructure Site Visit47Labadie Power PlantMW Hours Lost Due to Intake Trash Rack andTraveling Screen Problems1,24403190925200878300543240200719,93916,199*01,5732,167200614,3092,5975,4805055,727200518,0607,2715,3509434,496200477,20116,9687,70245,2717,260200359,04529,4347,1152,98719,5092002TotalUnit 4Unit 3Unit 2Unit 1* Pump Wreck from damage sustained in earlier yearsduring low cell water levelsMarch 4, 2009 USEPA IntakeStructure Site Visit48Labadie Power PlantIntake Impingement Mortality StudiesConducted in 2005-2006No T&E species~92.9% shad & drum (2005-2006)~93.2% shad/drum/carp (2005-2006)March 4, 2009 USEPA IntakeStructure Site Visit49Labadie Power PlantIntake Draft Technology AssessmentConducted prior to remand of Phase II RuleFine mesh screens not evaluated per Phase II RuleWide slot Cylindrical Wedgewire screensBulkhead mounting (20’ from intake face), 328’ long0.5fps approach velocity30 screens (each 5’Dx17’L)Air backwash system (no provisions for biofouling)$195M (2002 estimated)March 4, 2009 USEPA IntakeStructure Site Visit50Labadie Power PlantIntake Draft Technology Assessment (Part 2)3/8” mesh Ristroph screens1.2fps approach velocity, existing screen bays3/8” screen meshNew fish return system$4.0M (2002 estimated)Modular inclined screens2mm clear bar spacing with integral 2” OC trash rackFish bypass and pump system7fps approach velocity~6 hours of maintenance/day$570M (2002 estimated)March 4, 2009 USEPA IntakeStructure Site Visit51Labadie Power PlantFine Mesh Screen ConcernsDebris loading with fine mesh screensLarge freshwater inland riverNon-point source runoffEntrainment survivability with high debrisIcing and fine mesh screensIntake expansion potentialUnknown impacts on plant reliabilityViability of national standard – additionalresearch neededSite-specificity: large freshwater river & lakeMarch 4, 2009 USEPA IntakeStructure Site Visit52Labadie Power PlantComments and questions