ML24194A090
| ML24194A090 | |
| Person / Time | |
|---|---|
| Site: | 05200050 |
| Issue date: | 07/17/2024 |
| From: | Getachew Tesfaye NRC/NRR/DNRL/NRLB |
| To: | NuScale |
| Tesfaye, G., NRR/DNRL, 301-415-8013 | |
| Shared Package | |
| ML24194A088 | List: |
| References | |
| Download: ML24194A090 (16) | |
Text
NuScale Standard Design Approval Application for the US460 Quarterly NuScale-NRC Management Public Meeting July 17, 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)
Updated Audit Plan 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 July 17, 2024, the NRC staff has presented 1210 document requests and items for explanations in the audit.
898 items have been resolved in the audit, 118 items provided by NuScale are under review by the staff, and 153 items are waiting for NuScale to provide in the audit.
41 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 1210 153 118 898 41 FISD 34 4
6 22 2
HITI 51 18 5
27 1
0 10 20 30 40 50 60 70 0
200 400 600 800 1000 1200 1400 3/15/2023 5/15/2023 7/15/2023 9/15/2023 11/15/2023 1/15/2024 3/15/2024 5/15/2024 7/15/2024 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 FISD HITI ALL
The NRC staff has issued a total of 50 RAI questions, as of July 17, 2024 NuScale responded to RAI questions on or about agreed upon schedule 30 RAI questions have been resolved closed 3 RAI responses are under NRC review 17 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 - Resolved
- 10. LOCA Break at CVCS/CIV Connection (New) 9
As of July 17, 2024, the staff has presented 51 HITI document requests and items for explanations in the audit.
27 have been resolved in the audit, 5 items provided by NuScale are under review by the staff, 18 items are waiting for NuScale to provide in the audit, and 1 item is sent to RAI process 10 High Impact Technical Issues (HITIs)
Audit Activities
As of July 17, 2024, the staff presented 34 FISD document requests and items for explanations in the audit.
22 items have been resolved in the audit, 6 items provided by NuScale are under review by the staff, 4 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)
Updated Audit Plan Revise the audit plan Indicate completion date of the current phase of audit on June 27 (identification of new issues)
Define a new phase to disposition already identified issues (void, close, convert to RAI) by August 30 Exit the audit on September 2, 2024 12
Eight TRs* submitted prior to the SDAA are completed.
Four TRs submitted with SDAA are included in the SDAA Phase A audit
14 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.
NuScale submitted a request for NRC Actions to Promptly Enable Construction of ASME Code items without an Owner -
Closing Remarks 15
16 Questions?