ML24073A320
| ML24073A320 | |
| Person / Time | |
|---|---|
| Site: | Hermes File:Kairos Power icon.png |
| Issue date: | 03/13/2024 |
| From: | Kairos Power |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML24073A317 | List: |
| References | |
| KP-NRC-2403-004 KP-TR-022-NP, Rev 0 | |
| Download: ML24073A320 (1) | |
Text
Hermes2PostulatedEventAnalysisMethodology NonProprietary DocNumber Rev EffectiveDate KPTR022NP 0
June2023
©2023KairosPowerLLC
25of100 Peaktemperatureofpebblecarbonmatrixtolimittheamountoftritiumrelease 3.2.2.6 RadioactiveReleasefromaSubsystemorComponent AnexternalhazardeventcausescomponentsnotprotectedfromthehazardtofailandreleaseMAR storedinthesesystems.Thesesystemsinclude:
Tritiummanagementsystem Inertgassystem Chemistrycontrolsystem Inventorymanagementsystem Intermediateheattransportsystem Powergenerationsystems Thisnarrativecapturesthelimitingeventofthispostulatedeventcategory.Othereventsgroupedinthis categoryinclude:
Individualboundarybreachesorleaksfromanyoftheabovesystemsduetointernalhazardsor randomfailure RadioactivereleasefromSSCs(e.g.,residualFlibeintheprimarysaltpump(PSP),dustinPHSS piping)isolatedformaintenance Thekeyfigureofmeritforthiseventis:
Amountofmaterialsatriskreleased Thelimitingeventforthiscategoryisassumedtobeaseismiceventthatresultsinthefailureofall systemsorcomponentsnotqualifiedtomaintainstructuralintegrityinasafeshutdownearthquake.
TheamountofMARinthesesystemsisassumedtobelimitedtoanupperboundlimitsuchthat thetotalamountofmaterialatriskreleasedisboundedbytheamountreleasedduringthe MHA.Therefore,noadditionaltransientanalysisisneeded.
3.2.2.7 IntermediateHeatExchangerTubeBreak Acompletebreakofoneintermediateheatexchanger(IHX)tubeoccurs.Thepositivepressure differencemaintainedbetweentheprimaryloopandintermediateloopforcestheprimaryFlibecoolant intotheintermediateloopandmixeswiththeintermediatesaltcoolant.Thesymptomsofthetube breakaredetectedbythereactorprotectionsystemwhichinitiatescontrolandshutdownelements insertion,fulfillingthereactivitycontrolfunction.Thehighestworthelementisstuckoutanddoesnot insert.Thereactorprotectionsystemalsoinitiatesaprimarycoolantpumpandintermediatecoolant pumptripstolimitBeNaFingressintothereactorvessel.Thereactordecayheatremovalsystem performsitsfunctiontolimitreactortemperatureandfulfilltheheatremovalfunction.Aconservative amountofFlibeisassumedtoflowintotheintermediatelooptomixwiththeintermediatesalt.This amountisassumedtobethesameorboundedbythevolumeofFlibespillduringapostulatedpipe breakevent.ThecoreresponseanddoseconsequenceduetolossofFlibeintotheintermediateloop duringanintermediateheatexchangertubebreakisboundedbythoseofapipebreakduringsaltspill postulatedevent.SmallleaksintheIHXwillbedetectedvialimitsonallowableleakthreshold(e.g.,