ML19035A682
| ML19035A682 | |
| Person / Time | |
|---|---|
| Site: | NuScale |
| Issue date: | 02/04/2019 |
| From: | Rad Z NuScale |
| To: | Document Control Desk, Office of New Reactors |
| References | |
| LO-0219-64398 | |
| Download: ML19035A682 (3) | |
Text
LO-0219-64398 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com February 4, 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 "Scope and Schedule for Component Stress Evaluations" As discussed during a public meeting with NRC on December 18, 2018, NuScale agreed to define the scope and schedule for the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC)Section III stress analyses (including fatigue) to be completed for the NuScale Power Module (NPM) during the Design Certification Application (DCA) review of the NuScale plant.
These stress analyses evaluate the loading combinations as required by the ASME design specifications for primary, secondary, and peak stresses, including the calculation of cumulative usage factors (fatigue). At this meeting, NuScale noted that although these stress evaluations are at varying stages of completion given ongoing design finalization, analyses made available for audit have been checked and approved.
In addition to the summary of stress analyses, a report documenting the NuScale methodology for selecting components for ASME BPVC Section III stress analysis, including fatigue, at the design certification stage was also agreed to be provided.
This letter also provides a schedule for updating the ASME primary stress analyses, some of which have already been audited by the NRC, to incorporate updated seismic loads. Primary stress analysis evaluates the stresses derived from applicable loadings as defined in the ASME design specification, against the primary stress limits in ASME BPVC Section III.
Finally, this letter documents the schedule for completion of the flange bolt stress evaluation for the Emergency Core Cooling System (ECCS) valves, as discussed during review of NuScale eRAI 9358 Question 03.06.02-17.
The scope and schedule for completion of the analyses described above are provided in the attached table.
This letter makes no regulatory commitments or revisions to any existing regulatory commitments.
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
LO-0219-64398 Page 2 of 2 02/04/19 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com Distribution: Samuel Lee, NRC, OWFN-8G9A Gregory Cranston, NRC, OWFN-8G9A Marieliz Vera, NRC, OWFN-8G9A
Attachment:
Scope and Schedule for Component Stress Evaluations
Scope and Schedule for Component Stress Evaluations LO-0219-64398 Attachment Page 1 of 1 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com ASME Stress Analysis Audit Type Evaluation Ready for Audit ASME Design Report for RVV Primary and Secondary, including Fatigue Currently available ASME Design Report for RRV Primary and Secondary, including Fatigue Currently available CRDM Pressure Housing Fatigue Analysis Primary and Secondary, including Fatigue Currently available ASME Component Fatigue Screening Report N/A May 2019 CNV MS Nozzle Analysis Primary and Secondary, including Fatigue April 2019 CNV FW Nozzle Analysis Primary and Secondary, including Fatigue April 2019 RPV Main Steam Plenum Analysis Primary and Secondary, including Fatigue April 2019 RPV Feedwater Plenum Analysis Primary and Secondary, including Fatigue June 2019 RPV Refueling Flange Analysis Primary and Secondary, including Fatigue June 2019 CNV Refueling Flange Analysis Primary and Secondary, including Fatigue June 2019 RVV and RRV ECCS Flange Bolt Analysis Primary and Secondary, including Fatigue July 2019 CNV CVCS Nozzle Analysis Primary and Secondary, including Fatigue July 2019 DHRS Condenser Analysis Primary and Secondary, including Fatigue July 2019 RPV-CNV Upper Support Primary Stress Analysis Primary Stress July 2019 RPV Primary Stress Analysis Primary Stress July 2019 CNV Primary Stress Analysis Primary Stress July 2019 RVI Primary Stress Analysis Primary Stress July 2019 SG Primary Stress Analysis Primary Stress July 2019