ML22349A210
| ML22349A210 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/15/2022 |
| From: | John Klos Plant Licensing Branch II |
| To: | Geoffrey Miller Dominion Energy Co |
| Klos, J | |
| References | |
| Download: ML22349A210 (1) | |
Text
1 John Klos From:
John Klos Sent:
Thursday, December 15, 2022 8:27 AM To:
gary.d.miller@dominionenergy.com Cc:
craig.d.sly@dominionenergy.com; John Klos
Subject:
Formal 43-day RAI Issuance for Surry Turbine Building LAR-due Friday January 27, 2023
- Gary, By letter dated April 14, 2022, (Agencywide Documents Access and Management System Accession No. ML22104A125) as supplemented by letters dated May 11, 2022 and December 1, 2022 (ML22131A326 and ML22339A137, respectively) Virginia Electric and Power Company, the licensee (Dominion Energy Virginia) submitted a License Amendment Request (LAR) to reclassify the Unit 1 and 2 Turbine Buildings as tornado resistant structures. A clarification call was held on December 14, 2022 and the resultant request for additional information (RAI) is released below.
To complete its review, the NRC staff RAI is shown below. This request is now released formally with a 43-day calendar response period; thereby, these RAIs are due on Friday January 27, 2023.
Regulatory Basis:
The NRC issued construction permits for Surry, Units 1 and 2, before May 21, 1971. Consequently, Surry, Units 1 and 2, were not subject to the requirements in Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Domestic Licensing of Production and Utilization Facilities, Appendix A, General Design Criteria [GDC] for Nuclear Power Plants, (see SECY-92-223, Resolution of Deviations Identified during the Systematic Evaluation Program, (ML003763736) dated September 18, 1992.) The conclusion was that Surry, Units 1 and 2, met the intent of the General Design Criteria (GDC) published in 1967 (draft GDCs). Specifically, the proposed LAR notes that the Turbine Building meets the intent of GDC 2 and GDC 4.
10 CFR Part 50, Appendix A, GDC 2, in part, requires that the design of structures, systems and components important to safety, reflects the appropriate combinations of the effects of normal and accident conditions with the effects of natural phenomena (e.g., earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches) commensurate with their safety functions.
10 CFR Part 50, Appendix A, GDC 4, in part, requires that the design of structures, systems and components important to safety, reflects the protection against dynamic effects, including the effects of missiles, pipe whipping, and discharging fluids, commensurate with their safety functions.
Background:
LAR Section 3.3.2.3 Concrete Evaluation only discussed structural analysis results for the equivalent membrane plus bending stress and shear stress in concrete elements. The staff also needs to review the stresses in the reinforcing steel to confirm the structures can withstand the loads due to natural phenomena (e.g., tornado loading).
It appears that the proposed LAR does not provide information of the evaluation of the stresses in the reinforcing steel in the concrete.
Request:
- 1. Provide the evaluation of reinforcing steel in the concrete, including the ratio of maximum compressive or tensile strength over the compressive or tensile capacity of the reinforcing steel.
Thanks in advance,
2 John Klos DORLMcguire,SurryLicensingProjectManager U.S.NRC,OfficeofNuclearReactorRegulation(NRR),
DivisionofOperatingReactorLicensing(DORL),
NRC/NRR/DORL/LPL21,MSO9E3 Washington,DC205550001 301.415.5136,John.Klos@NRC.gov