ML18305B058
| ML18305B058 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 11/05/2018 |
| From: | Susquehanna, Talen Energy |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18305B058 (8) | |
Text
Susquehanna Steam Electric Station License Amendment Request for a Temporary Completion Time Extension to Support Emergency Service Water Piping Replacement Pre-Application Meeting November 5, 2018
Meeting Purpose
- Describe a future license amendment request
- Establish a common understanding of the scope of the request
- Establish a common understanding of the schedule
- Obtain NRC feedback
© Talen Energy 2
Proposed Change
- Replace piping in the Emergency Service Water System
- Temporary extension to Completion Times in LCOs 3.7.1 and 3.7.2
- Increase from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> and 7 days to 14 days
- Work is projected to take 11 days plus contingency
- Extension is necessary for the online unit
- Only one subsystem of ESW/RHRSW is required for the outage unit
- Extension would expire in 2026 for Unit 2 and 2027 for Unit 1
© Talen Energy 3
Emergency Service Water System
- Common for the two units
- Takes suction from the spray pond
- Cools diesel generators, ECCS pumps and room coolers, and other heat exchangers
- ESW and RHRSW share a common return line to the spray pond via spray arrays or bypass valves
© Talen Energy 4
RHR Service Water System
- 2 divisions per unit shared between units
- (e.g., Unit 1 A RHRSW pump can feed Unit 2 RHR HX)
- Takes suction from spray pond
- Cools RHR Heat Exchangers
- ESW and RHRSW share a common return line to the spray pond via spray arrays or bypass valves
© Talen Energy 5
Location of Pipe Replacement
- Initially, will replace Unit 1, Division 1 supply and return line near the Reactor Building Isolation valves
- May replace Unit 1 Division 2 and both Divisions on Unit 2
- Work renders division in both RHRSW and ESW inoperable
© Talen Energy 6
Upcoming Refueling Outages
- Divisional outages at Year Unit 1 Unit 2 Susquehanna 2020 Division 1 2021 Division 1 2022 Division 2
- Two opportunities for each 2023 Division 2 division 2024 Division 1 2025 Division 1
- Allows time to interpret results, 2026 Division 2 appropriately plan and 2027 Division 2 schedule subsequent replacements, and account for increased scope
© Talen Energy 7
Summary
- Susquehanna intends to replace ESW piping in 2020
- Based on initial replacement and inspection, may make subsequent replacements
- Requesting an extension to LCOs 3.7.1 and 3.7.2 for the online unit
- Extend to 14 days from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> and 7 days
- Extension would expire in 2026 for Unit 2 and 2027 for Unit 1
© Talen Energy 8