ML25328A241
| ML25328A241 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 11/24/2025 |
| From: | Harris B NRC/NRR/DNRL/NLRP |
| To: | |
| Shared Package | |
| ML25328A240 | List: |
| References | |
| Download: ML25328A241 (0) | |
Text
REQUEST FOR CONFIRMATION OF INFORMATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION EDWIN I. HATCH, UNITS 1 AND 2, SUBSEQUENT LICENSE RENEWAL REVIEW - SAFETY SOUTHERN NUCLEAR OPERATING COMPANY HATCH, UNITS 1, 2 DOCKET NO. 05000321, 05000366 ISSUE DATE: 11/24/2025 Set #1 RCI B.2.3.27-1 Based on discussions between the applicant and staff during the audit, it is the staffs understanding that in-scope buried diesel fuel oil storage tanks are from initial construction and have not been replaced.
Confirm that the in-scope buried diesel fuel oil storage tanks are from initial construction and have not been replaced.
RCI B.2.3.33-1 The enhancements to the Parameters Monitored or Inspected program element of the Structures Monitoring AMP and Inspection of Water-Control Structures Associated with Nuclear Power Plants AMP state that Include surface staining in the list of alkali-silica reaction (ASR) indications.
Confirm that the complete list of ASR indications included in the enhanced Structures Monitoring AMP and the enhanced Inspection of Water-Control Structures Associated with Nuclear Power Plants AMP aligns with, or is equivalent to, the visual indications of aggregate reactions, such as map or patterned cracking, alkali silica gel exudations, surface staining, expansion causing structural deformation, relative movement or displacement, or misalignment/distortion of attached components, as described in SRP-SLR Sections 3.5.3.2.2.1, Item 2, and 3.5.3.2.2.3, Item 2.
RCI 3.5.2.2.2 SLRA Section 3.5.2.2.2.1, Item 1 and SLRA Section 3.5.2.2.2.3, Item 1 state The concrete met all the standard code requirements. Air entrainment content conformed to the design requirements of ACI 211.1 as determined by ASTM C231. The staff reviewed Hatch general concrete specification PDCR-PSOC-84-001 in the Portal, which indicates that the total air content of the concrete shall not be less than three percent nor more than five percent of the concrete by volume.
In addition, SLRA Section 3.5.2.2.2.1, Item 1 and SLRA Section 3.5.2.2.2.3, Item 1 state that OE has not identified any significant loss of material (spalling, scaling) and cracking due to freeze-thaw of reinforced concrete structures within the scope of license renewal.
Confirm that the air content of the existing concrete used in the in-scope structures was between three percent and five percent.
Confirm that evaluation was performed and determined that the observed loss of material or cracking in accessible areas of the in-scope concrete structures discussed in SLRA Sections 3.5.2.2.2.1, Item 1, and 3.5.2.2.2.3, Item 1 had no impact on the intended function of the concrete structures.