RA17-059, Amendment to Commitments for Resolution of Anchor Darling Double Disc Gate Valve Part 21 Issues
| ML17171A424 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 06/20/2017 |
| From: | Trafton W Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA17-059 | |
| Download: ML17171A424 (3) | |
Text
Proprietary Information - Withhold from Public Disclosure Under 10 CFR 2.390 Proprietary Information - Withhold from Public Disclosure Under 10 CFR 2.390 RA17-059 June 20, 2017 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 LaSalle County Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-11 and NPF-18 NRC Docket Nos. 50-373 and 50-374
Subject:
Amendment to Commitments for Resolution of Anchor Darling Double Disc Gate Valve Part 21 Issues
Reference:
Letter from W. J. Trafton (Exelon Generation Company, LLC) to U.S. Nuclear Regulatory Commission, "Commitments for Resolution of Anchor Darling Double Disc Gate Valve Part 21 Issues," dated June 2, 2017 In the referenced letter, Exelon Generation Company, LLC (EGC) documented specific commitments that EGC was taking to resolve the Anchor Darling Double Disc Gate Valve Part 21 issues.
As part of EGC's continuing review of the Unit 2 High Pressure Core Spray (HPCS) injection isolation valve failure, we are revising the regulatory commitments made in the referenced letter. Most notably, EGC has proactively decided to shutdown LaSalle County Station (LSCS) Unit 1, scheduled to commence on June 22, 2017, to repair the Part 21 applicable parts and the design issue related to collar slippage for the Unit 1 HPCS injection valve.
This letter and its attachment contain proprietary information as defined by 10 CFR 2.390. Accordingly, it is respectfully requested that the letter and its attached proprietary information be withheld from public disclosure in accordance with 10 CFR 2.390 until June 24, 2017. The regulatory commitments contained in this letter are summarized in the attached table. The regulatory commitments in the attachment supersede the regulatory commitments made in the referenced letter in their entirety.
Proprietary Information - Withhold from Public Disclosure Under 10 CFR 2.390 June 20, 2017 U.S. Nuclear Regulatory Commission Page 2 Should you have any questions or require additional information, please contact Mr. Guy V. Ford Jr., at (815) 415-2800.
Respectfully, w~~/3L Site Vice President - LaSalle County Station Exelon Generation Company, LLC
Attachment:
Summary of Regulatory Commitments cc:
Regional Administrator-NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station Proprietary Information - Withhold from Public Disclosure Under 1 O CFR 2.390
Proprietary Information - Withhold from Public Disclosure Under 10 CFR 2.390 ATTACHMENT Summary of Regulatory Commitments Page 1 of 1 Proprietary Information - Withhold from Public Disclosure Under 10 CFR 2.390 The following table identifies commitments made by EGC. EGC discussed these commitments with the NRC on June 20, 2017.
COMMITMENT COMMITTED DATE OR OUTAGE COMMITMENT TYPE ONE-TIME ACTION (Yes/No)
PROGRAMMATIC ACTION (Yes/No)
EGC will repair the Part 21 applicable parts and the design issue related to collar slippage for the Unit 1 HPCS injection valve 1E22-F004, when Mode 4 is entered. Stem rotation, as-found MOV diagnostic, and required as-found surveillance testing will be performed during L1M22.
Maintenance Outage L1M22 Yes No EGC will repair the Part 21 applicable parts and the design issue related to collar slippage for the Unit 1 and Unit 2 susceptible Part 21 valves in the next refueling outage for each unit.
L1R17* and L2R17*
Yes No EGC will perform stem rotation and as-found diagnostics on the Unit 1 and Unit 2 susceptible Part 21 valves during the next refueling outage for each unit.
L1R17* and L2R17*
Yes No EGC will retain relevant parts repaired when Unit 1 and Unit 2 susceptible Part 21 valves are internally inspected. These parts will be kept for a minimum of six months to allow sufficient time for any required failure analysis to be completed. Issue Reports will be initiated and applicable learnings will be shared with the industry, as appropriate.
Six months following completion of L1R17* and L2R17*,
respectively Yes No
- NOTE: L1R17 is scheduled to commence in February 2018, and L2R17 is scheduled to commence in February 2019.