ML25014A012
| ML25014A012 | |
| Person / Time | |
|---|---|
| Site: | 05200050 |
| Issue date: | 01/22/2025 |
| From: | Getachew Tesfaye NRC/NRR/DNRL/NRLB |
| To: | |
| References | |
| Download: ML25014A012 (1) | |
Text
NuScale Standard Design Approval Application for the US460 Quarterly NuScale-NRC Management Public Meeting January 22, 2025
Opening Remarks 2
Opening Remarks NuScale US460 Standard Design Approval Application (SDAA) Review Overview Phase A Safety Review Requests for Additional Information (RAI)
High Impact Technical Issues (HITIs)
Topical Reports (TRs)
Generic Licensing Activities (Non-SDAA)
Closing remarks 3
Agenda
US460 SDAA Review Overview SDAA staged submittal was completed in January 2023 The NRC staff issued the results of its acceptance review with a request for supplemental information (RSI) on March 17, 2023 The staff began detailed safety evaluation of portions of the application not impacted by the RSI on March 20, 2023 Following the receipt of the supplemental information on July 14 and 17, 2023, a docketing letter was issued on July 31, 2023, that included a four phase, 24-month review schedule The staff issued a resource estimate letter on September 22, 2023. The SDAA review will require approximately 50,000 staff hours and $650,000 for contractor support 4
US460 SDAA Review Overview Phase Phase Name End date Phase A Advanced Safety Evaluation Report (ASER) without open items (draft completion date; internal NRC schedule)
November 2024*
Phase B ASER review (technical editing),
Management concurrence February 2025 Phase C ACRS Review of ASER May 2025 Phase D Final Safety Evaluation Report (FSER) and SDA July 2025 5
Four Phase Review milestones
- The ASER is substantively complete with a limited number of items remaining open. The review is on track for issuance of the SDAAs Final Safety Evaluation Report in July 2025.
Completed SDAA Phase reviews:
Phase A - Chapters 2, 3 (Except 3.7, 3.8, 3.9.2), 7, 8, 9, 10, 11, 12,13, 14, 16, 17 (except 17.4), 18, 19, and LOCA TR Phase B - Chapters 2, 3 (Except 3.7, 3.8, 3.9.2), 7, 8, 9, 10, 11, 12,13, 14, 16, 17 (except 17.4), 18, 19, and LOCA TR Phase C - Chapters 2, 3 (Except 3.7, 3.8, 3.9.2), 7, 8, 9, 10, 11, 12, 13, 14, 16, 17 (except 17.4), 18, and LOCA TR The Phase A review audit that begun on March 17, 2023, ended on August 31, 2024.
The staff is reviewing confirmatory items and RAI supporting documents under a separate audit.
During the Phase A audit, the NRC staff presented 1202 document requests and items for explanation:
1069 items were resolved in the audit, The remaining audit items were converted and issued as formal requests for additional information (RAIs) or were voided as they no longer support the SDAA review.
6 Phase A Safety Review
The NRC staff has issued a total of 85 RAI questions NuScale responded to RAI questions on or about agreed upon schedule 73 RAI questions have been resolved closed 7 RAI responses are under NRC review 5 RAI are awaiting responses 7
Requests for Additional Information (RAI)
High Impact Technical Issues (HITIs)
- 1. Design and classification of EDAS - Resolved
- 2. LOCA break spectrum-Resolved
- 3. Incorporated by Reference (IBR) - Resolved
- 4. CNV material change - Resolved
- 5. Lower RPV material change - Resolved
- 6. Secondary side controller design for DWO events - Resolved
- 7. DWO and steam generator inlet flow restrictor design changes -
Resolved
- 8. ASME qualification of the helical coil steam generator for the onset of DWO-induced loads - Resolved
- 9. Upper-to-lower RPV flange bolted joint shear loading that results from differential thermal expansion - Resolved
- 10. LOCA Break at CVCS/CIV Connection-Resolved 8
Eight TRs submitted prior to the SDAA are completed*.
Three TRs submitted with SDAA are included in the SDAA Phase A audit At the request of NuScale, TR-131981 Methodology for the Determination of the Onset of Density Wave Oscillations is put on hold and no longer tied to the scope of the US460 standard design approval application
Topical Reports (TRs)
10 Generic Licensing Activities (non-SDAA)
Generic TRs:
Mitigation of BeyondDesignBasis Events TR submitted on 9/11/2023.
Staff completed draft Safety Evaluation 8/30/24. ACRS meeting held on 10/1/24 found the SE is sufficiently complete to recommend its issuance.
The SE is currently undergoing administrative and legal review for issuance Fuel Storage Rack Design TR submitted on 10/9/2023. The staff accepted the TR for detailed review and plans to complete the Advance SE by May 2025. Advance RAIs sent to NuScale on 1/16/2025. Response expected by 2/17/2025 NuScale submitted a request for NRC Actions to Promptly Enable Construction of ASME Code items without an Owner - Code Case N-883 NRC response issued on 11/1/2024 (ML24204A242)
Closing Remarks 11
12 Questions?