ML20097F192
| ML20097F192 | |
| Person / Time | |
|---|---|
| Site: | NuScale |
| Issue date: | 04/06/2020 |
| From: | Rad Z NuScale |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LO-0420-69819 | |
| Download: ML20097F192 (7) | |
Text
LO-0420-69519 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com April 6, 2020 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 Presentation Materials Entitled ACRS Full Committee Presentation: NuScale Topic - Hydrogen/Oxygen Monitoring, PM-0420-69518, Revision 0 The purpose of this submittal is to provide presentation materials to the NRC for use during the upcoming Advisory Committee on Reactor Safeguards (ACRS) NuScale Full Committee Meeting on April 8, 2020. The materials support NuScales presentation of hydrogen/oxygen monitoring.
The enclosure to this letter is the nonproprietary presentation entitled ACRS Full Committee Presentation: NuScale Topic - Hydrogen/Oxygen Monitoring, PM-0420-69518, Revision 0.
This letter makes no regulatory commitments and no revisions to any existing regulatory commitments.
If you have any questions, please contact Matthew Presson at 541-452-7531 or at mpresson@nuscalepower.com.
Sincerely, Zackary W. Rad Director, Regulatory Affairs NuScale Power, LLC Distribution: Robert Taylor, NRC, OWFN-8H12 Michael Snodderly, NRC, OWFN-8H12 Christopher Brown, NRC, OWFN-8H12 Gregory Cranston, NRC, OWFN-8H12 Michael Dudek, NRC, OWFN-8H12 Getachew Tesfaye, NRC, OEFN-8H12
Enclosure:
ACRS Full Committee Presentation: NuScale Topic - Hydrogen/Oxygen Monitoring, PM-0420-69518, Revision 0
LO-0420-69519 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com
Enclosure:
ACRS Full Committee Presentation: NuScale Topic - Hydrogen/Oxygen Monitoring, PM-0420-69518, Revision 0
Copyright 2020 by NuScale Power, LLC.
Revision: 0 Template #: 0000-21727-F01 R6 NuScale Nonproprietary ACRS Full Committee Presentation Hydrogen/Oxygen Monitoring April 8, 2020 NuScale Topic
Copyright 2020 by NuScale Power, LLC.
Revision: 0 Template #: 0000-21727-F01 R6 Presenters Matthew Presson Licensing Project Manager Jim Osborn Licensing Engineer
Copyright 2020 by NuScale Power, LLC.
Revision: 0 Template #: 0000-21727-F01 R6 Summary and Conclusions
- Core damage accident is a beyond design basis accident
- Consistent with industry practice, allows nonsafety-related SSCs
- A NuScale core damage accident is low frequency
- Bounding analyses shows there is a minimum of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> before containment can be threatened
- Decision to place system into service would include precautions and follow RG 1.7 risk-informed process
- There is sufficient time to inspect and evaluate system condition
- If leaks develop, can isolate and repair
- Monitoring path can withstand combustion events
- Containment is well-mixed and representative sampling is required
Copyright 2020 by NuScale Power, LLC.
Revision: 0 Template #: 0000-21727-F01 R6 Containment Isolation Failure
- Chapter 19 documents an assessment of whether a severe core damage event with a containment failure could lead to a large release
- The conclusion is that at the earliest possible time of fuel-coolant interaction (FCI), the airborne fraction of volatile fission product aerosols is less than the calculated threshold for a large release.
- 6.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> is the earliest possible time of FCI for intact containment accidents
- Under the bounding assumption that the containment evacuation system (CES) piping were to be completely sheared at the time of unisolation, it is reasonable to conclude this event would not result in a large release or threaten public safety
Copyright 2020 by NuScale Power, LLC.
Revision: 0 Template #: 0000-21727-F01 R6 http://www.nuscalepower.com Twitter: @NuScale_Power Portland Office 6650 SW Redwood Lane, Suite 210 Portland, OR 97224 971.371.1592 Corvallis Office 1100 NE Circle Blvd., Suite 200 Corvallis, OR 97330 541.360.0500 Rockville Office 11333 Woodglen Ave., Suite 205 Rockville, MD 20852 301.770.0472 Richland Office 1933 Jadwin Ave., Suite 130 Richland, WA 99354 541.360.0500 Charlotte Office 2815 Coliseum Centre Drive, Suite 230 Charlotte, NC 28217 980.349.4804