ML19123A321
| ML19123A321 | |
| Person / Time | |
|---|---|
| Site: | NuScale |
| Issue date: | 05/03/2019 |
| From: | Rad Z NuScale |
| To: | Document Control Desk, Office of New Reactors |
| References | |
| LO-0519-65294 | |
| Download: ML19123A321 (6) | |
Text
LO-0519-65294 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com May 3, 2019 Docket No.52-048 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738
SUBJECT:
NuScale Power, LLC Submittal of Closure Plan for Turbine Missile Barrier Design Safety Review (Final Safety Analysis Report, Tier 2, Section 3.5.1.3)
The purpose of this letter is to provide a closure plan for the resolution of outstanding Turbine Missile Barrier Design Safety Review issues. These issues were identified and discussed with NuScale in public meetings on April 16, 2019 and April 25, 2019.
The attached closure plan presents the approach that NuScale will take to obtain satisfactory resolution of the identified issues, including an outline of the interim actions to be performed for closing and completing each task, and a schedule for completing the final responses. A communication method for each issue is also proposed.
The turbine missile barrier design is addressed in the NuScale Final Safety Analysis Report, Tier 2, Section 3.5.1.3. This closure plan is being submitted in support of ongoing Phase 2 review activities, for preparation of Phase 4 of the NuScale DCA. Specifically, this closure plan provides a path forward for demonstrating NuScale meeting GDC 4 and Regulatory Guide 1.115 given resolution of the following turbine missile related items:
Turbine missile barriers will be described in additional detail and supplemental information added to the FSAR.
Benchmarking and validation of the codes and calculations that support the turbine missile analysis will be addressed by NuScale providing a comparison table for the test data parameters compared to the NuScale parameters.
Characteristics of the turbine missile analyzed, and results from the impact analysis will be made available for audit. Agreed upon information will be summarized and submitted in a unilateral letter.
The documentation and basis for the bounding turbine missile parameters will be provided in a unilateral letter.
Schedules provided in the attachment are based on NuScales understanding of the scope of the actions identified. NuScale is available to discuss this closure plan in a public meeting. Note however that any additional requests or changes to the scope presented in this closure plan could result in a change to the schedules provided. provides the NuScale Closure Plan for the Turbine Missile Barrier Design Safety Review.
This letter makes no regulatory commitments and no revisions to any existing regulatory commitments.
LO-0519-65294 Page 2 of 2 05/03/2019 If you have any questions, please contact Marty Bryan at 541-452-7172 or at mbryan@nuscalepower.com.
Sincerely, Zackary W. Rad Director, Regulatory Affairs NuScale Power, LLC Distribution:
Samuel Lee, NRC, OWFN-8H12 Gregory Cranston, NRC, OWFN-8H12 Mariela Vera, NRC, OWFN-8H12 : NuScale Closure Plan for the Turbine Missile Barrier Design Safety Review
LO-0519-65294 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com :
NuScale Closure Plan for the Turbine Missile Barrier Design Safety Review
NuScaleClosurePlanforTurbineMissile BarrierDesignSafetyReview LO-0519-65294 Page 1 of 3 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com Question Number StaffRequest Plan Schedule Communication Method SEB1 TurbineMissileBarriers-
- Identifyanddescribespecific structuralbarriers
- IdentifyessentialSSCsthatbarrier protects
- Acceptancecriteriaforbarrier design
- NuScalewillidentifyanddescribethe structuralbarrierscreditedasturbinemissile barriers
- NuScalewillidentifytheessentialSSC protectedbystructuralbarriers.NuScalewill alsoprovidefigureswhichindicatethe creditedandnoncreditedbarriersinrelation toessentialSSCs.
- NuScalewillidentifytheacceptancecriteria forthebarrierdesign.
5/30/19 NuScaletoprovide informationand associatedFSAR changesina unilateralletter.
SEB2 BenchmarkandValidationof BarrierAnalysisFEMMethodology
- ComparisonofTestMissile parameterswithturbinemissile parameters
- TestMissilecharacteristic-rigid anddeformable
- Designcharacteristicsoftest concretebarrier
- Comparisonofpenetrationdepth andscabbingthicknessfromtests withresultsfromFEM NuScale/SIAwillprovideacomparisontable forthetestdataparameterscomparedtothe NuScaleparameters(perNRCprovided example.
5/30/19 ThisInformation willbeprovidedon thedocketina proprietary unilateralletter.
NuScaleClosurePlanforTurbineMissile BarrierDesignSafetyReview LO-0519-65294 Page 2 of 3 Question Number StaffRequest Plan Schedule Communication Method SEB3 SummaryofBarrierAnalysisResults
- Characteristicsandparametersof turbinemissilesevaluatedinthe barrieranalysis
- Barrierpenetrationdepthand requiredscabbingthicknessat turbinespeeds
- Globaldamageanalysis
- Sensitivityofpenetrationdepth andscabbingthicknesstovariation inFEManalysisinputparameters
- Howisuncertaintyininput parametersconsidered?
- NuScalewilldescribethecharacteristicsand parametersoftheturbinemissilesevaluated
- NuScalewillprovidethebarrierpenetration depthandrequiredscabbingthicknessat variousturbinespeeds.
- NuScalewillprovidediscussionofthe approachfortheglobaldamageanalysisanda summaryofresults.
- NuScalewillprovidediscussionanda quantitativesummaryofresultsofthe sensitivityofpenetrationdepthandscabbing thicknesstovariationsinFEManalysisinput parameters.
- NuScalewillprovidediscussionand quantitativeresultsofthesensitivityof variationsininputparameterstoanalysis resultsfortheFEA.
5/30/19 Thisinformation willbeprovidedin aunilateralletter.
NuScaleClosurePlanforTurbineMissile BarrierDesignSafetyReview LO-0519-65294 Page 3 of 3 Question Number StaffRequest Plan Schedule Communication Method MCB4 Documentationandbasisfor boundingturbinemissile parameters-
- Sizeandweightforthebounding turbinemissile
- Parameterssuchasturbine model,rotormaterialand processing,fracturetoughness, preserviceandinserviceinspection andtestingrequirements(or analysisreperformedusinglast stagerotorwithbladesattached)
- Parametersofturbine(including rotorsizeandweight)
- NuScalewillprovidethesizesandweightsof themissilesconsideredintheanalyses.This willincludethepropertiesconsideringthe missileastheblade,thebladeandrotor fragment,andhalfofthelaststagerotor.
- NuScalewillperformananalysisusinghalfof thelaststagerotor.
- NuScalewillprovideparametersofturbine (includingrotorsizeandweight)usedinthe analysis.
5/30/19
- Informationwill beprovidedina markuptothe FSAR.
- Informationon theanalysisofthe laststagerotor withblades attachedwillbe madeavailablefor auditand summarizedina markuptothe FSAR.
- Informationwill beprovidedina markuptothe FSAR.
5 Variousquestions/comments providedduringaudit
- NuScalewillprovideresponsestothe feedbackprovidedduringtheaudit.
5/30/19
- Informationwill beprovidedby unilateralletter.