ML24099A032
| ML24099A032 | |
| Person / Time | |
|---|---|
| Issue date: | 04/11/2024 |
| From: | Getachew Tesfaye NRC/NRR/DNRL/NRLB |
| To: | NuScale |
| Tesfaye, G., NRR/DNRL, 301-415-8013 | |
| Shared Package | |
| ML24099A030 | List: |
| References | |
| Download: ML24099A032 (15) | |
Text
NuScale Standard Design Approval Application for the US460 Quarterly NuScale-NRC Management Public Meeting April 11, 2024
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)
Focus Items Supporting Reliable Schedule Development (FISDs)
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
Completed SDAA Phase reviews:
Phase A - Chapters 2, 7, 9, 10, 11, 12,13, 17 (except 17.4),
and 18.
Phase B - Chapters 2, 10, 11, 13, and 17 (except 17.4)
Phase C - Chapters 2, 10, 11, 13, and 17 (except 17.4)
As of April 9, 2024, the NRC staff has presented 983 document requests and items for explanations in the audit.
726 items have been resolved in the audit, 87 items provided by NuScale are under review by the staff, and 101 items are waiting for NuScale to provide in the audit.
37 items resulted in request for additional information 6
Phase A Safety Review
7 Issues by Category Total Awaiting Response NRC Reviewing Resolved in Audit Sent to RAI process ALL 983 101 87 726 37 FISD 34 2
11 19 2
HITI 47 13 15 18 1
FISD HITI ALL 0
10 20 30 40 50 60 70 0
200 400 600 800 1000 1200 03/15/2023 05/15/2023 07/15/2023 09/15/2023 11/15/2023 01/15/2024 03/15/2024 Weekly/Daily Issue Count (Dotted lines)
Cumulative Issue Count (Solid lines)
Issues Generated vs Issues Resolved over time (including document requests)
Cumulative Issues Resolved Cumulative Issues Generated Issues Resolved Issues Generated
The NRC staff has issued a total of 41 RAI questions, as of April 9, 2024 NuScale responded to RAI questions on or about agreed upon schedule 22 RAI questions have been resolved closed 8 RAI responses are under NRC review 11 RAI are awaiting responses 8
Requests for Additional Information (RAI)
High Impact Technical Issues (HITIs)
- 1. Design and classification of EDAS
- 2. LOCA break spectrum
- 3. Incorporated by Reference (IBR)
- 4. CNV material change - Resolved
- 5. Lower RPV material change - Resolved
- 6. Secondary side controller design for DWO events
- 7. DWO and steam generator inlet flow restrictor design changes
- 8. ASME qualification of the helical coil steam generator for the onset of DWO-induced loads
- 9. Upper-to-lower RPV flange bolted joint shear loading that results from differential thermal expansion - New 9
As of April 9, 2024, the staff has presented 47 HITI document requests and items for explanations in the audit.
18 have been resolved in the audit, 15 items provided by NuScale are under review by the staff, 13 items are waiting for NuScale to provide in the audit, and 1 item is sent to RAI process NRC-NuScale additional deep dives on DWO related HITIs scheduled for April.
10 High Impact Technical Issues (HITIs)
Audit Activities
As of April 9, 2024, the staff presented 34 FISD document requests and items for explanations in the audit.
19 items have been resolved in the audit, 11 items provided by NuScale are under review by the staff, 2 items are waiting for NuScale to provide additional information or revised responses, and 2 items sent to RAI process 11 Focus Items For Schedule Development (FISDs)
Eight TRs* submitted prior to the SDAA are completed.
Four TRs submitted with SDAA are included in the SDAA Phase A audit
13 Generic Licensing Activities (non-SDAA)
Generic TRs:
Mitigation of BeyondDesignBasis Events TR submitted on September 11, 2023. The staff accepted the TR for detailed review and plans to complete the Advance SE by August 2024.
Fuel Storage Rack Design TR submitted on October 9, 2023. The staff has accepted the TR for detailed review and plans a complete the Advance SE by May 2025.
Reactor Flange Tool Support Design TRs pre-application meeting was held on October 26, 2023. The planned TR submittal has been delayed until late 2024 ApplicationSpecific Modifications to the Base HIPS Platform TR - Pre-application meeting held on November 20, 2023. The planned TR submittal has been delayed until late 2024.
(NuScale DCA) Request for Exemption to the Reporting Requirements of 10 CFR 50.46(a)(3) [Changes to the approved LOCA methodology] - Staff has granted the requested exemption - FRN issued on April 5, 2024
Closing Remarks 14
15 Questions?