ML23229A013
| ML23229A013 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 08/17/2023 |
| From: | Rhoades D Constellation Energy Generation |
| To: | Joel Wiebe Plant Licensing Branch III |
| Wiebe J | |
| References | |
| Download: ML23229A013 (1) | |
Text
Centralized Programs Engineering Relief Request for Alternative Requirements for Byron Unit 1 Reactor Pressure Vessel Inservice Inspection Intervals Achieving EXCELLENCE in Program Engineering
Background
-Relief Request I3R-23 was authorized until the end of 2025 for Byron Unit 1 by NRC Safety Evaluation (SE) dated December 10, 2014, to extend the volumetric examination of reactor pressure vessel (RPV) welds, pertaining to ASME BPV Code,Section XI, Examination Categories B-A and B-D, from 10 to 20 years (ADAMS Accession Number ML14303A506, correction letter ML15022A416).
-The third ISI interval for Byron Unit 1 ended on July 15, 2016. The fourth ISI interval ends on July 15, 2026.
1 l Relief Request for Alternative Requirements for Byron Unit 1 Reactor Vessel Inservice Inspection Intervals Privileged and Confidential
Reason for Request
- Constellation is planning to reschedule the volumetric examination of Byron Unit 1 RPV welds, pertaining to Examination Category B-A and B-D, during the fourth ISI interval in the spring 2026 refueling outage.
- This eliminates an additional core barrel removal during the fall 2024 refueling outage (original planned date for the RPV welds examinations) which results in a reduction in industrial safety hazards and person-rem exposure.
- This also minimizes outage execution risk as performance efficiencies can be increased with other major inspections and maintenance projects by allowing for better project planning and work coordination.
2 l Relief Request for Alternative Requirements for Byron Unit 1 Reactor Vessel Inservice Inspection Intervals Privileged and Confidential
Proposed Alternative
- An alternative is requested to perform the volumetric examination of Byron Unit 1 RPV welds during the fourth ISI interval in the spring 2026 refueling outage.
- As the third ISI interval ended on July 15, 2016, the proposed alternative is within the timeframe specified in Plant-Specific Information Item (3) under Section 2.4 of NRC SE for relief request I3R-23:
Licensees must report the results of prior ISI of the RPV welds and the proposed schedule for the deferred RPV weld exams for the 20-year ISI interval. The 20-year inspection interval is the maximum interval allowed per WCAP-16168-NP, Revision 2. In its request for an alternative, each licensee shall identify the years in which the deferred inspections will be performed. The dates provided in licensees' requests must be within plus or minus one refueling cycle of the dates identified in the revised implementation plan provided to the NRC in PWROG Letter OG-10-238, dated July 12, 2010 (ADAMS Accession No. ML11153A033).
3 l Relief Request for Alternative Requirements for Byron Unit 1 Reactor Vessel Inservice Inspection Intervals Privileged and Confidential
Proposed Alternative
-This proposed alternative does not affect any technical basis described under relief request I3R23 as they remain valid.
-This proposed alternative provides an acceptable level of quality and safety in accordance with 10 CFR 50.55a(z)(1).
4 l Relief Request for Alternative Requirements for Byron Unit 1 Reactor Vessel Inservice Inspection Intervals Privileged and Confidential
Precedent
- 1) "Byron Station, Unit No. 1 - Relief from Requirements of the ASME Code to Extend the Reactor Vessel Inservice Inspection Interval (TAC No. MF3596)," dated December 10, 2014, Relief Request I3R-23 (ADAMS Accession Number ML14303A506, correction letter ML15022A416).
5 l Relief Request for Alternative Requirements for Byron Unit 1 Reactor Vessel Inservice Inspection Intervals Privileged and Confidential
6 l Byron MRP-227/20-Year ISI Exams Deferral to 2026 Privileged and Confidential