ML22181B160
| ML22181B160 | |
| Person / Time | |
|---|---|
| Site: | 99902069, Hermes File:Kairos Power icon.png |
| Issue date: | 06/30/2022 |
| From: | Kairos Power |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML22181B157 | List: |
| References | |
| KP-NRC-2206-014 | |
| Download: ML22181B160 (2) | |
Text
KP-NRC-2206-014 Changes to ER Chapter 2 (Non-Proprietary)
EnvironmentalReport
ProposedAction KairosPowerHermesReactor 214 Revision0 2.3 NONPOWERREACTOR ThefacilitywouldhouseoneHermesreactor.TheHermesreactorisaKPFHRwiththecore configurationmadeupofapebblebedcore,graphitemoderator/reflector,andFlibemoltensalt coolant.Thiswillbeanonpowertestreactorwithapproximatedimensionsofthereactorvesselbeing 3.4metersindiameterand4.7metersinheight.Thefacilitywillcontainonlyoneunitwithamaximum thermalpowerof35megawatts(MW)thermal(MWth).Thepurposeofthereactorwillbeto demonstrateandtestthedesignfeaturesandsafetyfunctionsofthetechnology.Itwillbeanonpower testreactor,wherebytheheatgeneratedinthecorewillnotbeusedfortheproductionofelectric power.Instead,heatwillbetransportedoutofthecoreviatheprimaryheattransportsystem(PHTS) andthendissipatedintotheatmosphereviatheprimaryheatrejectionsystem(PHRS).Figure2.31 showstheprocessflowdiagramforthereactorandheatdissipation.
Thereactorvesselandinternalstructureswillbeconstructedofstainlesssteelthatconformstothe 20179compositionspecificationrequirementsofAmericanSocietyofMechanicalEngineersSectionIII, Division5,withatargetedservicelifeof10years.Themoderator/reflectorwillbeconstructedofa nucleargradegraphiteselectedforitscompatibilitywiththechemistryenvironmentofthereactorcore andwouldalsohaveatargetedservicelifeof10years.
Thereactorcorewilluse4centimeter(cm)diametergraphitepebbleswithembeddedcoatedTRI structuralISOtropic(TRISO)particlefuel.Theparticleswillbecomprisedofauraniumfuelkerneland threelayersofcarbonandceramicbasedmaterialsthatpreventthereleaseofradioactivefission products.Themaximumenrichmentoftheuraniumfuelwillbe19.55weightpercent,andtherequired startupfissileinventoryisestimatedtobenogreaterthan25kilograms(kg)235U.Afractionofthe pebblesinthecorearemoderator(graphiteonly)pebbles.Fuelpebblesareextractedfromthereactor whileonlineusingthepebbleextractionmachine,theburnupismeasured,andthefueliseither returnedtothereactororremovedtostorage.TheestimatedresidencetimeforpebblesinHermesis about315days.