ML18344A151

Phase 2 Audit Plan for the Audit of NuScale Power, LLC Documents Related to Reactor Internals Seismic Analysis

ML18344A151
Person / Time
Site:	NuScale
Issue date:	12/13/2018
From:	Amadiz Marieliz Vera NRC/NRO/DLSE/LB1
To:	Samson Lee NRC/NRO/DLSE/LB1
Vera A M/NRO/5861
References
Download: ML18344A151 (6)

Text

December 13, 2018 MEMORANDUM TO: Samuel S. Lee, Chief Licensing Branch 1 Division Licensing, Siting, and Environmental Analysis Office of New Reactors FROM: Marieliz Vera, Project Manager /RA/

Licensing Branch 1 Division Licensing, Siting, and Environmental Analysis Office of New Reactors

SUBJECT:

PHASE 2 AUDIT PLAN FOR THE AUDIT OF NUSCALE POWER, LLC., DOCUMENTS RELATED TO REACTOR INTERNALS SEISMIC ANALYSIS On January 6, 2017, NuScale Power, LLC (NuScale) submitted a design certification (DC) application for a small modular reactor to the U.S. Nuclear Regulatory Commission (NRC)

(Agencywide Documents Access and Management System (ADAMS) Accession Number ML17013A229). The NRC staff started its detailed technical review of NuScales DC application on March 15, 2017. In May 2017, the NRC staff completed the Phase 1 regulatory audit of NuScale Final Safety Analysis Report Section 3.9.2, Dynamic Testing and Analysis of Systems, Components, and Equipment, and issued the Phase 1 audit report (ML18023A091) which summarizes the NRC staffs Phase 1 audit findings.

The purpose of the Phase 2 subject audit is to examine NuScales reactor internals seismic analysis specifically related to the acoustic absorption analysis. The audit will take place at NuScales offices in Rockville, Maryland, and/or online via NuScales electronic reading room.

The audit is currently scheduled for December 19, 2018. The audit plan is enclosed.

Docket No.52-048

Enclosure:

Audit Plan cc w/encl.: DC NuScale Power, LLC Listserv CONTACT: Marieliz Vera, NRO/DLSE 301-415-5861

ML18344A151 NRO-002 OFFICE NRO/DLSE/LB1: PM NRO/DLSE/LB1: LA NRO/DLSE/LB1: PM NAME MVera CSmith MVera DATE 12/10/2018 12/13/2018 12/13/2018 1

U.S. NUCLEAR REGULATORY COMMISSION PHASE 2 AUDIT OF NUSCALE POWER, LLC., REACTOR INTERNALS SEISMIC ANALYSIS DOCKET NO.52-048 AUDIT PLAN APPLICANT: NuScale Power, LLC., (NuScale)

APPLICANT CONTACT: Marty Bryan DURATION: December 19, 2018 LOCATION: NuScale Power, LLC 11333 Woodglen Drive, Suite 205 Rockville, Maryland 20852 NuScale Electronic Reading Room (eRR)

AUDIT TEAM: Yuken Wong (NRO, Audit Lead)

Timothy Lupold (NRO/MEB Branch Chief)

Stephen Hambric (NRC Consultant)

David Ma (NRC Consultant)

Marieliz Vera (NRO, Project Manager)

I. BACKGROUND On March 15, 2017, the U.S. Nuclear Regulatory Commission (NRC) accepted and docketed a standard design certification application (DCA) (Reference 1) submitted by NuScale Power, LLC.,

(NuScale), to certify its small module reactor design (Reference 2).

Between May 16, 2017, and November 2, 2017, the NRC staff completed Phase 1 of the subject audit that included review and examination of NuScales design documents, drawings, test plans, and test reports related to the reactor internals comprehensive vibration assessment program (CVAP) and NuScale power module (NPM) analysis for Service Level D (seismic in combination with pipe break events). The NRC staffs Phase 1 audit summary report is available in Agencywide Documents Access and Management System (ADAMS) under Accession Number ML18023A091 (Reference 3).

This audit plan describes the NRC staffs plans for conducting Phase 2 of the audit of NuScales documents related to the reactor internals seismic analysis.

Enclosure

II. PURPOSE The purpose of the audit is to review the NuScale Power Module seismic analysis to verify that the acoustic absorption analysis is appropriate. In TR-0916-51502, Revision 1, NuScale Power Module Seismic Analysis submitted to the NRC on October 2, 2018. NuScale discussed the calculation of acoustic absorption coefficient for the attenuation of acoustic loads at the interface between the pool water and the reactor building during a seismic event. To expedite access to the information, both NuScale and the NRC agreed that an audit would be the most expedient way to review the material.

III. REGULATORY AUDIT BASIS Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Domestic Licensing of Production and Utilization Facilities, Appendix A, General Design Criteria for Nuclear Power Plants, General Design Criterion 4, Environmental and dynamic effects design bases states the following:

Structures, systems, and components important to safety shall be designed to accommodate the effects of and to be compatible with the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including loss-of-coolant accidents. These structures, systems, and components shall be appropriately protected against dynamic effects, including the effects of missiles, pipe whipping, and discharging fluids, that may result from equipment failures and from events and conditions outside the nuclear power unit.

The NRC staff will conduct this audit in accordance with the guidance provided in the Office of New Reactors (NRO)-REG-108, Regulatory Audits (Reference 4).

IV. REGULATORY AUDIT SCOPE The scope of the NRC staffs Phase 2 audit will focus on review the NuScale Power Module seismic analysis and finite element models to verify that the acoustic absorption coefficient is calculated appropriately. In TR-0916-51502, Revision 1, NuScale discusses the calculation of acoustic absorption coefficient for the attenuation of acoustic loads at the interface between the pool water and the reactor building during a seismic event.

V. DOCUMENTS/INFORMATION NECESSARY FOR THE AUDIT The NRC staff requests NuScale to make documents, finite element models, and seismic analysis results available to the NRC staff in the NuScale eRR related to the reactor internals.

A NuScale engineer familiar with these materials should be present at the audit and have access to a computer which can be used to examine modeling inputs and outputs.

Appropriate handling and protection of proprietary information shall be acknowledged and observed throughout the audit.

VI. SPECIAL REQUESTS The NRC staff requests that NuScale provide the technical staff with access to the audit

documents. NuScale can upload the requested documents onto the NuScale eRR for the NRC staffs review. During the audit, the NRC staff will have questions and discussion items for the NuScale subject matter experts (SME). NuScale is requested to provide the NRC staff with telephone access to the NuScale SMEs. When the NRC staffs review of the documents associated with a specific issue is complete, the staff will notify either the NRO, Division of Division Licensing, Siting, and Environmental Analysis project manager, or NuScale that these documents can be removed from the eRR.

VII. AUDIT ACTIVITIES AND DELIVERABLES The NRC audit team will review the technical areas identified in Section IV of this audit plan.

Depending upon the effort needed in a given area, NRC team members may be reassigned to ensure adequate coverage of important technical elements.

The regulatory audit is currently scheduled for December 19, 2018. If the NRC staff determines that the resolution of open items requires additional effort and time, a follow-up audit will be scheduled.

Within 90 days from the conclusion of the audit, the audit team will issue a publicly available audit summary report to the applicant.

The NRC project manager will coordinate with NuScale in advance of audit activities to verify specific documents and identify any changes to the audit schedule and requested documents.

The audit entrance/exit meetings and weekly audit meeting are to be scheduled as follows:

• Entrance Meeting: December 19, 2018.

• Exit Meeting: January 3, 2019.

The NRC staff acknowledges the proprietary nature of the information requested. It will be handled appropriately throughout the audit. While the NRC staff will take notes, the NRC staff will not remove hard copies or electronic files from the audit site.

The audit outcome may be used to identify any additional information to be submitted for making regulatory decisions, and it will assist the NRC staff in the issuance of RAIs (if necessary) for the licensing review of NuScale Final Safety Analysis Report, Chapter 3, and any related information provided in other chapters, in preparation of the NRCs Safety Evaluation Report.

If necessary, any circumstances related to the conductance of the audit will be communicated to Marieliz Vera (NRC) at 301-415-5861, or email: Marieliz.Vera@nrc.gov.

VIII. REFERENCES

1. NRC Letter, NuScale Power, LLC, - Acceptance of an Application for Standard Design Certification of a Small Modular Reactor, ML17074A087, issued March 23, 2017.

2. NuScale Standard Plant DCA, Revision 0, issued December 2016.

3. Audit Summary Report of NuScale Reactor Internals Comprehensive Vibration

Assessment Program and Seismic Analysis, ML18023A091, issued February 5, 2018.

4. NRO-REG-108, Regulatory Audits, ML081910260, issued April 2, 2009.