05000370/LER-2023-001, Manual Actuation of the Unit 2 Motor Driven Auxiliary Feedwater Pumps
| ML23151A370 | |
| Person / Time | |
|---|---|
| Site: | Mcguire |
| Issue date: | 05/31/2023 |
| From: | Pigott E Duke Energy Carolinas |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| RA-23-0123, 02467460 LER 2023-001-00 | |
| Download: ML23151A370 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| 3702023001R00 - NRC Website | |
text
-,DUKE
ENERGY Serial No: RA-23-0123 May 31, 2023 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 ATTENTION: Document Control Desk
Subject:
Duke Energy Carolinas, LLC McGuire Nuclear Station, Unit 2 Docket No. 05000370 Renewed License No. NPF-17 Licensee Event Report 2023-001-00 Nuclear Condition Report Number 02467460 Edward R. Pigott Site Vice President McGuire Nuclear Station Duke Energy MG01VP 112700 Hagers Ferry Road Huntersville, NC 28078 o: 980.875.4805 Edward.Pigott@duke-energy.com 10 CFR 50.73 Pursuant to 10 CFR 50. 73 Section (a)(2)(iv)(A), attached is Unit 2 Licensee Event Report (LER) 2023-001-00, regarding manual actuation of the Auxiliary Feedwater Motor Driven Pumps in response to potential equipment failure.
This event is considered to have no significance with respect to the health and safety of the public. There are no regulatory commitments contained in this LER.
If questions arise regarding this LER, please contact Jeff Sanders at 980-875-4680.
Sincerely, Edward R. Pigott Duke Energy McGuire Nuclear Station Site Vice President Attachment
U.S. Nuclear Regulatory Commission RA-23-0123 Page 2 cc:
Laura A. Dudes Administrator Region II U.S. Nuclear Regulatory Commission Marquis One Plaza 245 Peachtree Center Avenue NE Suite 1200, 30303-1257 J. Klos Project Manager (McGuire)
U.S. Nuclear Regulatory Commission Mail Stop O-9-E3 11555 Rockville Pike Rockville, MD 20852 Chris Safouri NRC Senior Resident Inspector McGuire Nuclear Station
Abstract
On April 2, 2023, at 0341, Operations entered the Senior Reactor Operator Decision Making Process after receiving a report that called into question the functionality of the operating 2B Main Feedwater (MFW) Pump Recirculation Valve, 2CF-81. At the time, Unit 2 was in Mode 3, the 2B MFW pump was feeding the steam generators, and the 2A MFW Pump Recirculation Valve 2CF-76 was nonfunctional. At 0352 hours0.00407 days <br />0.0978 hours <br />5.820106e-4 weeks <br />1.33936e-4 months <br />, Operations manually started the Auxiliary Feedwater (AFW) Motor Driven Pumps to feed the steam generators to allow corrective maintenance on the MFW System. The AFW Motor Driven Pumps started as designed. Flow to the steam generators was not adversely impacted during this sequence.
Subsequent investigation determined that the 2A and 2B MFW recirculation piping experienced abnormal vibration when flow was introduced through valves 2CF-76 and 2CF-81, making the valves susceptible to failure. The recirculation piping had recently been modified to replace the carbon steel elbow piping immediately downstream of the valves with a stainless steel target tee configuration. To mitigate the issue, the target tee was replaced with the original carbon steel elbow arrangement. This event had no impact on the health and safety of the public.
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SAFETY ANALYSIS
Operations manually started the AFW Motor Driven Pumps prior to removing the 2B MFW pump from service. The AFW Motor Driven Pumps started as designed, and feed flow to the steam generators was not adversely impacted during this event. All plant systems responded as expected. Therefore, it is concluded that the impact on core damage risk was very small, and the event had no impact on public health and safety.
ADDITIONAL INFORMATION
A review of previous Licensee Event Reports was conducted to determine if this was a recurring event (i.e.,
similar event with the same cause or same failure mode). No previous similar events were identified within the past three years associated with manual actuation of the AFW System. Therefore, this is not considered a recurring event.