ML25240B630
| ML25240B630 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/28/2025 |
| From: | Constellation Energy Generation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML25240B627 | List: |
| References | |
| Download: ML25240B630 (1) | |
Text
Table 2-1 Table 2-1: Additional Information Pertaining to Reactor Vessel Inspection for Calvert Cliffs Unit 1 Inspection methodology:
The latest RV ISI for Calvert Cliffs Unit 1 was conducted in accordance with the requirements of Appendix VIII of the ASME Code,Section XI, 2004 Edition with no Addenda, as modified by 10 CFR Part 50(b)(2)(xiv, xv, and xvi). Evaluation of recordable indications was performed to the acceptance standards of Section XI, 2004 Edition with no Addenda. Future inservice inspections will be performed to ASME Section XI, Appendix VIII requirements.
Number of past inspections:
All welds have been inspected at least three times with the exception of five lower head meridional welds which have been inspected two times.
Number of indications found:
There were nine total indications identified in the beltline and extended beltline regions during the most recently completed inservice inspection. These indications are located in the upper to intermediate shell circumferential weld seam (Item 10 in Table 3-1), the intermediate to lower shell circumferential weld seam (Item 11 in Table 3-1), and the longitudinal welds seams in the upper shell and intermediate shell (Items 12, 14, and 17 of Table 3-1). All nine indications are acceptable per Table IWB-3510-1 of Section XI of the ASME Code. The indications are not within the inner 1/10th or inner 1 of the reactor vessel wall thickness; therefore, the indications are all inherently acceptable per the requirements of the Alternate PTS Rule, 10 CFR 50.61a (Reference 9).
Proposed inspection schedule for balance of plant life:
The fourth inservice inspection is scheduled for Spring 2028. This inspection will instead be performed in the sixth interval no later than Spring 2040. The proposed inspection date is within plus or minus one refueling outage of the date in the latest revised implementation plan, OG-10-238 (Reference 3), which reflects the next inspection being performed in 2038.