RA17-056, Commitments for Resolution of Anchor Darling Double Disc Gate Valve Part 21 Issues
| ML17156A799 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 06/02/2017 |
| From: | Trafton W Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA17-056 | |
| Download: ML17156A799 (2) | |
Text
Exelon Generation,
RA17-056 June 2, 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 LaSalle County Station 2601 North 21" Road Marseilles IL 61141 815-415-2000 Telephone
\\wtW exeloncorp com
Subject:
Commitments for Resolution of Anchor Darling Double Disc Gate Valve Part 21 Issues On May 21, 2017, Exelon Generation Company, LLC (EGC) determined that continued operation of LaSalle County Station (LSCS), Units 1 and 2, was supported based upon the operability determination detailed in Operability Evaluation 17-002 regarding the Anchor Darling Double Disk Gate Valves. It was concluded that the fifteen (15) safety-related valves included in the Motor Operated Valve Program would not experience a similar failure as the stem-disc separation of the HPCS Injection Isolation Valve, 2E22-F004. Valve disassembly and inspection of the Unit 2 HPCS injection isolation valve revealed the wedge pin to be sheared and the valve stem threads damaged, causing the stem to separate from the valve disc.
Details of the damage, cause evaluation, and planned repairs were discussed with the NRC during a conference call on May 25, 2017. During this call, EGC discussed planned actions to resolve the Anchor Darling Double Disc Valve Part 21 issues following completion of repairs and associated testing. Specific commitments were discussed with the NRC to address the efficacy of the repairs. The regulatory commitments contained in this letter are summarized in the attached table.
Should you have any questions or require additional information, please contact Mr. Guy V. Ford Jr., at (815) 415-2800.
Respectfully,
~~f!lL 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 Sta!ion
ATTACHMENT Summary of Regulatory Commitments The following table identifies commitments made by EGG. EGG discussed these commitments with the NRG during a conference call on May 25, 2017.
COMMITTED COMMITMENT TYPE DATE ONE-TIME PROGRAMMATIC COMMITMENT OR OUTAGE ACTION ACTION (Yes/No)
(Yes/No)
EGG will not perform any unnecessary work on During the Yes No Unit 1 Automatic Depressurization System, Reactor remainder Core Isolation Cooling, Residual Heat Removal, of Unit 1 and Low Pressure Core Spray systems other than Cycle 17 required predefines, surveillance testing, and operation corrective maintenance.
EGG will replace the Part 21 applicable parts of the Forced Yes No Unit 1 HPCS injection valve 1 E22-F004, if Mode 4 Outage or is entered.
L 1 R17*
EGG will replace the Part 21 applicable parts of the L 1 R17* and Yes No Unit 1 and Unit 2 susceptible Part 21 valves in the L2R17*
next refueling outage for each unit.
EGG will perform as-found diagnostics on the Unit 1 L 1 R17* and Yes No and Unit 2 susceptible Part 21 valves during the L2R17*
next refueling outage for each unit.
EGG will retain relevant parts replaced when Unit 1 Six months Yes No and Unit 2 susceptible Part 21 valves are internally following inspected. These parts will be kept for a minimum completion of six months to allow sufficient time for any of L 1 R17*
required failure analysis to be completed.
and L2R17*,
respectively
- Note: L 1 R17 is scheduled to commence in February 2018, and L2R17 is scheduled to commence in February 2019.
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