ML22181B056
| ML22181B056 | |
| Person / Time | |
|---|---|
| Site: | 99902069, Hermes File:Kairos Power icon.png |
| Issue date: | 06/30/2022 |
| From: | Kairos Power |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML22181B053 | List: |
| References | |
| KP-NRC-2206-013 | |
| Download: ML22181B056 (2) | |
Text
KP-NRC-2206-013 Changes to PSAR Chapter 7 (Non-Proprietary)
PreliminarySafetyAnalysisReport
InstrumentationandControls
KairosPowerHermesReactor 714 Revision0 Thewatertankisolationvalvesalsofailopenfailinplaceuponlossofpower.Thedecayheatremoval portionoftheRPScanreceivetheactuationsignalfromeitheranautomaticormanualsource.
ThedecayheatremovalportionoftheRPSusescoretemperatureandneutrondetectorsasinputs throughhardwired,analog,safetyrelatedsignalwirewaysthatareterminatedatlocalcabinets.Section 7.5providesadditionalinformationaboutthesensorsthatprovideinputtotheRPS.
ThedecayheatremovalportionoftheRPSalsoincludesamanualactuationcapabilityfromthemain controlroomandtheremoteonsiteshutdownpanel.Section7.4includesadiscussionofthehuman interfacewiththedecayheatremovalportionoftheRPS.
Table7.32providesalistofinterlocksimplementedforRPSsystems.Beforesufficientfissionproducts andsubsequentdecayheatisproducedinthecore,forexampleduringstartup,DHRShasnosafety function.Duringthisperiod,thedecayheatremovalportionoftheRPSincludesamanualinhibitionof theDHRSthatisavailabletoplantoperatorstoallowforadditionalthermalmanagementcapabilities.
Oncedecayheatisproducedatasufficientrateinthecore,theRPSblocksthemanualinhibition capabilityutilizingsafetyrelatedactuations.Aftershutdown,oncefissionproductdecayheat productionhasdroppedtolevelsnotrequiringDHRS,theRPSremovestheblockonthemanual inhibitioncapability.TheparameterstheRPSusestodetermineifthemanualinhibitionistobe permittedorblockedareneutrondetectors(sourceandpowerrange)andreactorvesseltemperature.
7.3.2 DesignBases ConsistentwithPDC1,theRPSisdesignedusingrelevantindustrycodesandstandardsandthe QualityAssuranceprogram.
ConsistentwithPDC2,theRPSisdesignedtowithstandandbeabletoperformduringnatural phenomenaevents.
ConsistentwithPDC3,theRPSisdesignedandlocatedtominimize,consistentwithothersafety requirements,theprobabilityandeffectoffiresandexplosions.
ConsistentwithPDC4,theRPSisdesignedfortheenvironmentalconditionsassociatedwithnormal operation,maintenance,testing,andpostulatedevents.
ConsistentwithPDC10and20,theRPSprovidesreactortripanddecayheatremovalactuationthat ensureradionuclidereleasedesignlimitsarenotexceededduringnormaloperation.
TheRPSimplementsPDC13inthatthesystemincludessensorsthatmonitorcoretemperature, vessellevel,andpowerlevel.Thesensorsmonitorvariablesandsystemsovertheiranticipated rangesfornormaloperationandforpostulatedeventconditions.
ConsistentwithPDC15,theRPSprovidesreactortripanddecayheatremovalactuationtoensure thatthedesignconditionsofthereactorcoolantboundaryarenotexceededduringnormal operation.
ConsistentwithPDC20,theRPSprovidesautomaticreactortripanddecayheatremovalactuation toensureradionuclidereleasedesignlimitsarenotexceededasaresultofpostulatedevents.The RPSisalsodesignedtoidentifypostulatedeventconditionsandinitiatepassiveinsertionof reactivityshutdownelementsandpassivedecayheatremoval.
ConsistentwithPDC21,theRPSisdesignedwithsufficientredundancyandindependencetoassure thannosinglefailureresultsinlossofitsprotectionfunction.IndividualcomponentsoftheRPSmay beremovedfromservicefortestingwithoutlossofrequiredminimumredundancy.TheRPSis designedtopermitperiodictesting.
ConsistentwithPDC22,theeffectsofnaturalphenomena,andofnormaloperating,maintenance, testing,andpostulatedeventconditions,donotresultinlossoftheprotectionfunctionfortheRPS.