ML17339A181

NRC Hq Pre-Submittal LaSalle CSCS LAR 12-7-2017 Final

ML17339A181
Person / Time
Site:	LaSalle
Issue date:	12/07/2017
From:	Kimberly Green Plant Licensing Branch III
To:
Green K, NRR/DORL/LPLIII
Shared Package
ML17339A178	List: ML17339A179 ML17339A180 ML17339A181
References
Download: ML17339A181 (18)

Text

License Amendment Request for CSCS-ECW Repairs at LaSalle County Station NRC/Exelon Meeting, NRC Headquarters Guy Ford Larry Lehman Ryan Sprengel December 7, 2017

Agenda

• Introductions and Opening Remarks

• Objectives

• Need for Licensing Action

• Maintenance Details

• License Amendment Request Overview

• Regulatory Evaluation

• Summary

• Schedule 1

Objectives

• Present and discuss maintenance activities and need for License Amendment Request (LAR)

• Describe key aspects of the planned LAR

• Present proposed Technical Specification (TS) changes

• Discuss and receive feedback on the key aspects and proposed changes 2

Need for Licensing Action

• The planned LAR is to support plant maintenance which will improve equipment reliability.

• Proposed changes will allow installation of isolation valves and proactive CSCS-ECW piping maintenance without a dual unit shutdown.

• The maintenance replaces piping that has degraded due to long term wear and corrosion. The new isolation valves will also ensure future isolation capability.

• Four outages will be utilized to align divisional work for each unit, two divisions on each of the two units:

• L2R17 (2019) - Division 2

• L1R18 (2020) - Division 1

• L2R18 (2021) - Division 1

• L1R19 (2022) - Division 2 3

Need for Licensing Action

• The proposed CSCS-ECW maintenance replaces 4 and 6 DGCW piping and installs new isolation valves. The specific pipelines are 1DG06A-4, 1DG23B-6, 2DG06A-4 and 2DG23B-6. Because the downstream side of the pipelines are not currently equipped with isolation valves, the lines will be isolated by hot tapping and installing line stops.

• CSCS-ECW is subject to the requirements of the ASME B&PV Code Section III. Because the line stops are non-Code the impacted CSCS-ECW subsystems will be declared inoperable.

• Even though inoperable, the impacted CSCS-ECW subsystems, will remain available with no impact on risk or design function (see slide 10).

• 7 days will allow sufficient time to install and test new isolation valves to provide ASME B&PV Code Section III isolation capability.

4

Maintenance Details - Line Stop (Stopple)

• Line Stop - nonconforming line-stop used to isolate branch lines and allow installation of isolation valves

• Will be designed to meet or satisfy system design requirements (e.g. pressure capacity and seismically mounted) 5

Maintenance Details - Division 1 6

Maintenance Details - Unit 1, Division 2 7

Maintenance Details - Unit 2, Division 2 8

Maintenance Details - DGCW Supported Systems

• DGCW Division 1

• Division 1 DG (Common 0)

• ECCS cubicle area coolers

• LPCS pump motor cooler

• DGCW Division 2

• Division 2 DGs (Unit 1 1A and Unit 2 2A)

• ECCS cubicle area cooler

• Redundant equipment and divisions will be protected in accordance with the LaSalle County Station risk management program 9

License Amendment Request Overview

• Example: Unit 2, Division 2 System/Equipment Outage Planned Work Affected Subsystems*

Remaining Replace a 70 ft section of piping U-2, Div-2 DGCW U-2, Div-1 DGCW 2DG06A-4 between valve Inoperable/available Operable 2DG007 and line 2RH83BB-24. U-2, Div-2 DG 2A U-2, Div-1 RHRSW Inoperable/available Operable And U-2, Div-2 RHRSW U-0, Div-1 DG 0A Inoperable/available Operable L2R17 Install new isolation valve in line U-1, Div-2 DGCW U-1, Div-1 DGCW 2019 Inoperable/available Operable 2DG06A-4 adjacent to line U-1, Div-2 DG 1A U-1, Div-1 RHRSW 2RH83BB-24.

Inoperable/available Operable U-1, Div-2 RHRSW 2DG06A-4 is part of the U-2, Div -2 DGCW Inoperable/available subsystem

(*) Work is being performed on Unit 2, Division 2 DGCW subsystem; both units share a common Division 2 discharge line, therefore the work also affects the Unit 1, Division 2. Additional, supported systems are not included in this table.

10

License Amendment Request Overview

• Single submittal applicable to four outages:

• L2R17 (2019) - Division 2

• L1R18 (2020) - Division 1

• L2R18 (2021) - Division 1

• L1R19 (2022) - Division 2

• Proposed change to TS 3.7.2 Conditions to allow 7 days with DGCW subsystems inoperable but available

• Proposed change to TS 3.8.1 Conditions to allow 7 days with Division 2 Diesel Generators on both units inoperable but available 11

License Amendment Request Overview

• Proposed TS changes provided as handout

• TS 3.7.2 Modified Condition A

• TS 3.7.2 New Conditions B and C

• TS 3.8.1 Modified Conditions C and F

• TS 3.8.1 New Condition G

• Applicability is constrained to four upcoming outages

• During the maintenance period, additional TS Conditions may be entered, with no changes requested

• The Safety Function Determination Program (SFDP) will be applied as appropriate for supported systems with no Loss of Safety Function 12

Regulatory Evaluation

• Regulatory requirements:

• 10 CFR 50.36 Technical Specifications

• 10 CFR 50 Appendix A, General Design Criteria

• Licensing Basis

• UFSAR Section 9.2.1 CSCS Equipment Cooling Water

• Precedent Amendments

• LaSalle County Station 75/161, 180/167

• Braidwood Station 30

• Byron Station 136 13

Summary

• EGC is planning to submit a LAR to support plant maintenance which will improve equipment reliability.

• The LAR will propose changes which would revise TS 3.7.2 and 3.8.1 to allow 7 days with one or more DGCW trains inoperable and two Division 2 DGs inoperable, during four upcoming refueling outages

• Additional system inoperability will be evaluated using the Safety Function Determination Program and will follow existing TS LCOs

• Discussion and feedback is requested on the key aspects and proposed changes 14

Schedule for Submittal

• EGC plans to submit the license amendment request in January 2018 15

Questions?

16

Acronym Key

• ASME B&PV Code - American Society of Mechanical Engineers Boiler and Pressure Vessel Code

• CFR - Code of Federal Regulations

• CSCS-ECW - Core Standby Cooling System - Equipment Cooling Water

• DG - Diesel Generator

• DGCW - Diesel Generator Cooling Water

• EGC - Exelon Generation Company

• LCO - Limiting Condition for Operation

• NRC - U.S. Nuclear Regulatory Commission

• RHR - Residual Heat Removal

• RHRSW - Residual Heat Removal Service Water

• TS - Technical Specification

• UFSAR - Updated Final Safety Analysis Report 17