ML25104A198
| ML25104A198 | |
| Person / Time | |
|---|---|
| Issue date: | 02/11/2025 |
| From: | Thomas Scarbrough NRC/NRR/DEX/EMIB |
| To: | |
| References | |
| Download: ML25104A198 (1) | |
Text
ASME OM CODE CASES OM CODE CASES (FOR DIVISION 1)
ThefollowingarethelatestapprovedOMCasesasofFebruary11,2025.
CasesrepresentalternativesoradditionstotheOMCode.ACasecanbeamethodofhandlingareplytoaninquirywhen studyindicatedthattheCodewordingneedsclarificationorwhenthereplymodifiestheexistingrequirementsofthe Code,orgrantspermissiontousealternativemethods.
Casesremainineffectfortheapplicableeditionsandaddendauntiltheyareannulled.
Applicability
Uptoand CodeCaseNo.
Title
From Including
OMN1,Rev2 AlternativeRulesforPreserviceandInserviceTesting
1995
2006 ofCertainElectricMotorOperatedValveAssemblies inLightWaterReactorPowerPlants
OMN2
ThermalReliefValve
Annulledin2014
OMN3 RequirementsforSafetySignificanceCategorization
1990
2017 ofComponentsUsingRiskInsightsforInservice TestingofLWRPowerPlants
OMN4 RequirementsforRiskInsightsforInserviceTestingof
1996
2020 CheckValvesatLWRPowerPlants
OMN5 TestingofLiquidServiceReliefWithoutInsulation
Annulledin2014
OMN6 AlternateRulesforDigitalInstruments
1990
2005a
OMN7 AlternativeRequirementsforPumpTesting
1995
2012
OMN7,Rev1 AlternativeRequirementsforPumpTesting
1995
2020
OMN8 AlternativeRulesforPreserviceandInserviceTesting
1988
2004 ofPowerOperatedValvesThatAreUsedfor SystemControlandHaveaSafetyFunctionper OM10,ISTC1.1,orISTA1100
OMN9 UseofaPumpCurveforTesting
1990
1992
OMN10 RequirementsforSafetySignificanceCategorization
1995
2020 ofSnubbersUsingRiskInsightsandTestingStrategiesfor InserviceTestingofLWRPower Plants
OMN11 RiskInformedTestingforMotorOperatedValves
1995
2006
Revised February 11, 2025
OMN12 AlternateRequirementsforInserviceTestingUsing
1998
2020 RiskInsightsforPneumaticallyandHydraulically OperatedValveAssembliesinLightWaterReactor PowerPlants
OMN13,Rev4 PerformanceBasedRequirementsforExtendingSnubber
1995
2020 InserviceVisualExaminationIntervalatLWRPowerPlants
OMN14 AlternativeRulesforValveTestingOperationsand
Annulledin2014 Maintenance,AppendixI:BWRCRDRuptureDisk Exclusion
OMN15,Rev4 PerformanceBasedRequirementsforExtendingtheSnubber 1998
2020 OperationalReadinessTestingIntervalatLWRPowerPlants
OMN16,Rev2 UseofaPumpCurveforTesting
1998
2020
OMN17,Rev1 AlternativeRulesforTestingASMEClass1Pressure
1995
2017 Relief/SafetyValves
OMN18 AlternateTestingRequirementsforPumpsTested
1994
2011a QuarterlyWithin+/-20%ofDesignFlow
OMN19 AlternateUpperLimitfortheComprehensivePump
1994
2009 Test
OMN20,Rev1 InserviceTestFrequencies
Allearliereditions 2015
andaddenda
OMN21 AlternateRequirementsforAdjustingHydraulic
1995
2011a ParameterstoSpecifiedReferencePoints
OMN22 SmoothRunningPumps
1990 2020
OMN23 AlternativeRulesforTestingPressureIsolationValves 2001 2020
OMN23,Rev1AlternativeRulesforTestingPressureIsolationValves 2001 2023
OMN24 AlternativeRequirementsforTesting 2001 2020
ASMEClassII&IIIReliefValves
OMN25 AlternativeRequirementsforTestingAppendixI 2001 2020
PressureReliefValves
OMN26 AlternativeRiskInformedandMarginBasedRulesfor 2012 2020
InserviceTestingofMotorOperatedValves
OMN27 AlternativeRequirementsforTestingCategoryAValves
1998
2020 (NonPIV/CIV)
OMN28 AlternativeValvePositionVerificationApproachtoSatisfy 1998
2020 ISTC3700forValvesNotSusceptibletoStemDiskSeparation.
OMN29 PumpConditionMonitoringProgram
2004
2020
Revised February 11, 2025
OMN30 AlternativeValvePositionVerificationApproachtoSatisfy 1998
2020 ISTC3700forValvesSusceptibletoStemDiskSeparation
OMN31 AlternativetoAllowExtensionofISTA3120Inservice
2001
2020 ExaminationandTestIntervalsFrom10Yearsto12Years
OMN32 AlternativeRequirementsforRangeandAccuracyofPressure, 2001
2020 Flow,andDifferentialPressureInstrumentsUsedinPumpTests
OMN32,Rev1 AlternativeRequirementsforRangeandAccuracyofPressure, 2001
2022 Flow,andDifferentialPressureInstrumentsUsedinPumpTests
OMN33 AlternativeCheckValveExerciseTestFrequency
1990
2022
OMN34 UseofPumpCurveTesting
2012
2022 Revised February 11, 2025