ML19042A073

Nuscale - Chapters 2 and 17 ACRS Full Committee, PM-0219-64333, Revision 0

ML19042A073
Person / Time
Site:	NuScale
Issue date:	02/05/2019
From:	NuScale
To:	Office of New Reactors
References
L0-0219-64439 PM-0219-64333, Rev 0
Download: ML19042A073 (7)

Text

L0-0219-64439 :

"Chapters 2 and 17 ACRS Full Committee," PM-0219-64333, Revision 0

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NuScale Power, LLC 11 DD NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www.nuscalepower.com

NuScale Nonproprietary Chapters 2 and 17 ACRS Full Committee Neil Olivier Corporate Services, Director Paul lnfanger Regulatory Affairs, Supervisor PM-0219-64333 Revision: 0 Copyright 2019 by NuScale Power, LLC.

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Background:

NuScale ODI Program

• NuScale's Quality Assurance program is based on ASME NQA-1-2008.

• ASME NQA-1-2008 Part I, Requirement 3, Section 500, Part (b) allows the deferral of design verification activities provided the unverified portions of the design are identified and controlled.

• Open Design Items (ODls) are a form of engineering assumption controlled under the NuScale Design Control Process. Assumptions are information or data that is selected for a design activity, other than previously validated design criteria, which are taken to be true for the sake of analysis.

• Assumptions, along with verified design inputs, describe the conditions under which design activity results are considered valid.

- Assumptions are documented and tracked

- Basis statements provide engineering justification that the assumption is reasonable

- Verifier assures assumptions are reasonable 2

PM-0219-64333 Revision: O Copyright 2019 by NuScale Power, LLC.

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Background:

NuScale ODI Program {cont.)

• 0Dls are resolved/verified via the design verification process.

• Design Verification is required:

- Ideally before releasing the design for procurement, manufacture, or construction, or f.or use by another design organization (with a different QA program)

- In all cases, the design verification is required prior to relying on that SSC to perform its function 3

PM-0219-64333 Revision: O Copyright 2019 by NuScale Power, LLC.

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NuScale NRC Interactions on 0Dls

• 2017 QA Inspection

• Training/Communication of Staff

• DCA Chapter Audits - Review of NuScale ODls present in source documentation reviewed.

• RAls 4

PM-0219-64333 Revision: 0 Copyright 2019 by NuScale Power, LLC.

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2017 QA Inspection Highlights

• Included review of NuScale's ODI Process

• The NRC report (ML17201J382) cited:

- Review of 170 specific 0Dls

- NuScale had a cons-ervatively low threshold for opening 0Dls

- No violations or nonconformances were identified

- NuScale ODI process adequately manages unverified assumptions 5

PM-0219-64333 Revision: 0 Copyright 2019 by NuScale Power, LLC.

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Conclusion

• The NuScale 001 process properly controls unverified engineering assumptions in accordance with NQA-1.

• NRC has reviewed 001 process thru various interactions:

- RAls

- DCA Chapter Audits

- QA Inspection 6

PM-0219-64333 Revision: 0 Copyright 2019 by NuScale Power, LLC.

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