ML18305B058

Emergency Service Water Piping Replacement LAR - NRC Pre-Application Meeting

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 Pre-Application Meeting November 5, 2018 License Amendment Request for a Temporary Completion Time Extension to Support Emergency Service Water Piping Replacement

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 Susquehanna

• Two opportunities for each division

• Allows time to interpret results, appropriately plan and schedule subsequent replacements, and account for increased scope Year Unit 1 Unit 2 2020 Division 1 2021 Division 1 2022 Division 2 2023 Division 2 2024 Division 1 2025 Division 1 2026 Division 2 2027 Division 2

© 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