ML23248A455
| ML23248A455 | |
| Person / Time | |
|---|---|
| Site: | 05200050 |
| Issue date: | 09/11/2023 |
| From: | David Drucker NRC/NRR/DNRL/NRLB |
| To: | Matthew Mitchell NRC/NRR/DNRL/NRLB |
| References | |
| Download: ML23248A455 (6) | |
Text
September 11, 2023
MEMORANDUM TO: Matthew A. Mitchell, Acting Chief NewReactorLicensingBranch Divis ion of New and Renewed Licenses OfficeofNuc lear Reactor Regulation
FROM: DavidM.Drucker,S enior Project Manager /RA/
NewReactorLicensingBranch Divis ion of New and Renewed Licenses OfficeofNuc lear Reactor Regulation
SUBJECT:
AUDIT
SUMMARY
FOR U.S. NUCLEAR REGULATORY COMMISSION REQUESTS FOR SUPPLEMENTAL INFORMATION IDENTIFICATION OF SPECIFIC INFORMATION REQUIREMENTS - NUSCALE US460 STANDARD DESIGN APPROVAL APPLICATION
By memorandum dated March 22, 2023, (Agencywide Documents Acces s and Management System (ADAMS) Accession No. ML23067A298), the U.S. Nuclear Reg ulatory Commission (NRC) staff issued an audit plan to review audit material assoc iated with the technical sufficiency issues in the US460 Standard Design Approval (SDA) application related to density wave oscillation (DWO) documented in the staff acceptance revie w letter dated March 17, 2023 (ML23058A160). The NRC started the audit with a teleconference entrance meeting on March 27, 2023. The audit was conducted via NuScales electronic read ing room (eRR),
teleconferences and an in-person meeting held on April 18-19, 2 023, at NuScales Rockville office. During the audit, the NRC staff and NuScale discussed 1 7 DWO related questions generated by the staff. NuScale responded to the questions in t he eRR and submitted the responses on the docket by letter dated July 14, 2023 ( ML23195A092 non-proprietary and ML23198A244 proprietary). An audit exit m eeting was held on July 20, 2023.
CONTACT: David Drucker, NRR/DNRL Getachew Tesfaye, NRR/DNRL 301-415-6233 301-415-8013
Docket No. 05200050
Enclosure:
Audit summary
cc w/encl.: NuScale Power LLC Listserv
ML23248A455 via email* NRR-106 OFFICE DNRL/NRLB: PM DNRL/NLIB: LA DRA/SNRB: TR DRA/SNRB: BC NAME DDrucker* SGreen* ABarrett RPatton DATE 09/05/2023 09/05/2023 09/06/2023 09/06/2023 OFFICE DNRL/NRLB: PM DNRL/NRLB: BC DNRL/NRLB:PM NAME GTesfaye* MMitchell* DDrucker*
DATE 09/10/2023 9/11/2023 9/11/2023
AUDIT
SUMMARY
FOR THE REGULATORY AUDIT OF REQUESTS FOR SUPPLEMENTAL INFORMATION IDENTIFICATION OF SPECIFIC INFORMATION REQUIREMENTS - NUSCALE US460 STANDARD DESIGN APPROVAL APPLICATION
1.0 BACKGROUND
AND PURPOSE
By letter dated December 31, 2022 (electronically submitted on January 1, 2023), NuScale Power, LLC (NuScale) transmitted the last part of the required staged submittal of the Standard Design Approval (SDA) application. The submitted documents can be found at Agencywide Documents Access and Management System (ADAMS) Accession No. ML 22339A066. The staff completed the acceptance review of the SDA application an d issued the acceptance review letter on March 17, 2023 (ML23058A160).
Based on its review, the U.S. Nuclear Regulatory Commission (NR C) staff identified technical sufficiency issues in the SDA application related to density wa ve oscillation (DWO), with impacts on some parts of the SDA application Part 2, Final Safety Analy sis Report (FSAR) Chapters 3, 5, 6, 15 and 19, and the following associated licensing topical reports (LTRs): (1) TR-0516-49422, Loss-of-Coolant Accident [LOCA] Evaluation Model, Revi sion 3 (ML23008A002); (2)
TR-0516-49416, Non-Loss-of-Coolant Accident Analysis Methodolo gy, Revision 4 (ML23005A305); (3) TR-124587, Extended Passive Cooling and Rea ctivity Control Methodology, Revision 0 (ML23005A308); and (4) TR-131981, Met hodology for the Determination of the Onset of Density Wave Oscillations (DWO), Revision 0 (ML22364A332).
As a result, the NRC staff concluded that supplemental informat ion on this topic was required before the NRC staff could accept the SDA application for docke ting and conduct a detailed technical review of all aspects of the application.
By memorandum dated March 22, 2023 (ML23067A298), the NRC staff issued an audit plan to review audit material associated with in the SDA application re lated to DWO. The purpose of the audit was to review audit material related to DWO so the staff can have adequate understanding of underlying information related to DWO.
2.0 REGULATORY AUDIT BASIS
This regulatory audit is based on the submittal of the FSAR doc uments for its SDA application of the NuScale design (ML22339A066). The bases for the submittal f ollow the regulations in Title 10 of the Code of Federal Regulations (10 CFR) Part 52, Licenses, Certifications, and Approvals for Nuclear Power Plants, as outlined below:
- 10 CFR Part 52, Subpart E - Standard Design Approvals
- § 52.131 Scope of subpart.
- § 52.133 Relationship to other subparts.
- § 52.135 Filing of applications.
- § 52.136 Contents of applications; general information.
- § 52.137 Contents of applications; technical information.
- § 52.139 Standards for review of applications.
Enclosure
- § 52.141 Referral to the Advisory Committee on Reactor Safegua rds.
- § 52.143 Staff approval of design.
- § 52.145 Finality of standard design approvals; information re quests.
- § 52.147 Duration of design approval.
3.0 AUDIT LOCATION AND DATES
The audit was conducted remotely via NuScales eRR, and Teams m eetings. In addition, there was one in-person meeting held on April 18-19, 2023, at NuScale s Rockville office.
Dates: March 27, 2023-July 20, 2023
Location: NuScale eRR
4.0 AUDIT TEAM MEMBERS
Rebecca Patton, NRR/DSS/SNRB Antonio Barret, NRR/DSS/SNRB Shanlai Wu, NRR/DSS/SNRB Rosie Sugrue, NRR/DSS/SNRB Ron Harrington, NRR/DSS/SNRB Ryan Nolan, NRR/DSS/SNRB Stew Bailey, NRR/DEX/EMIB Yuken Wong, NRR/DEX/EMIB Steve Hambric, NRC contractor Pete Yarsky, RES/DSA/CRAB II Pete Lien, RES/DSA/CRAB II Getachew Tesfaye, NRR/DNRL/NRLB Stacy Joseph, NRR/DNRL/NRLB David Drucker, NRR/DNRL/NRLB
5.0 APPLICANT PARTICIPANTS
Thomas Griffith Wren Fowler Erin Blumsack Hiral Kadakia Kevin Fischer
6.0 AUDIT DOCUMENTS
The staff did not audit hardcopy documents. NuScale submitted a nd the NRC staff received a transmittal letter (ML23145A058) with a data disk containing proprietary NuScale DWO data.
7.0 DESCRIPTION
OF AUDIT ACTIVITIES AND
SUMMARY
OF OBSERVATIONS
The audit scope covered the following topics related to DWO for the NuScale SDA application and applicable LTRs:
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- Scope of the methodology for calculating DWO and the full appl icability range, conditions, and figures of merit;
- Testing that was performed including test results and test dat a;
- Comparisons of test data to the analysis models and justificat ion for the applicability of the models for evaluation of the SDA application design; and
- Evaluations for the effect of DWO or other flow instability ph enomena on steam generator and decay heat removal system performance SDA applica tion Section 5.4.3 and 6.3) during all operating conditions including normal opera tion, LOCAs, Non-LOCAs, and extended passive cooling.
During the audit, the NRC staff and NuScale discussed 17 DWO re lated questions generated by the staff. NuScale responded to the questions in the eRR and su bmitted the responses by letter dated July 14, 2023 (ML23195A092 non-proprietary and ML23198A244 proprietary).
8.0 EXIT BRIEFING
The NRC staff conducted an audit exit meeting via a teleconfere nce on July 20, 2023. The NRC staff summarized their observations.
9.0 OPEN ITEMS AND PROPOSED CLOSURE PATHS
Not applicable.
10.0 DEVIATIONS FROM THE AUDIT PLAN
Not applicable.
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11.0 REFERENCES
- 1. NuScale Power, LLC, US460 Standard Design Approval applicati on, December 31, 2022, (ADAMS Accession No. ML22339A066)
- 2. TR-0516-49422, Loss-of-Coolant Accident [LOCA] Evaluation M odel, Revision 3 (ADAMS Accession No. ML23008A002)
- 3. TR-0516-49416, Non-Loss-of-Coolant Accident Analysis Method ology, Revision 4 (ADAMS Accession No. ML23005A305)
- 4. TR-124587, Extended Passive Cooling and Reactivity Control Methodology, Revision 0 (ADAMS Accession No. ML23005A308)
- 5. TR-131981, Methodology for the Determination of the Onset o f Density Wave Oscillations (DWO), Revision 0 (ADAMS Accession No. ML22364A33 2)
- 6. Audit Plan for U.S. Nuclear Regulatory Commission Requests for Supplemental Information Identification of Specific Information Requirements - NuScale Standard Design Approval Application, Revision 0 (ADAMS Accession No. M L23067A298)
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