ML23065A200
| ML23065A200 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 03/03/2023 |
| From: | Shaffer C Flowserve - Lynchburg VA Operations |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| Download: ML23065A200 (1) | |
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FLOWSERVE March 3, 2023 Document Control Desk U.S. Nuclear Regulatory Commission Washington DC 20555-0001 Limitorque
Subject:
Final Notification of Potential Part 21 on Peerless 56 frame DC Motors
Reference:
ADAMs Accession No. ML22342B140
Dear Sirs,
This letter is a follow-up to our initial notification of a potential Part 21 condition being evaluated by Flowserve-Limitorque. Flowserve has completed the evaluation of the deviation described in the initial notification ( copied below). Flowserve has concluded that the deviation has no substantial impact to the safety function of the component and/or the associated actuator. Accordingly, this investigation is now considered closed with no further action required.
Technical questions related to this issue can be directed to Kyle Ramsey, Principal Engineer, Nuclear Products at kramsey@flowserve.com Initial Notification:
Flowserve-Limitorque received information from Entergy Waterford 3 on 10-5-2022 that during routine maintenance involving partial disassembly of a Peerless 125 volt, 25 ft-lb, 56 frame DC motor, the motor was found to have two fasteners securing the brush holder ring assembly to the motor frame while the motor frame machining has provision to accommodate four fasteners.
Investigation into Limitorque actuator environmental and seismic qualification records indicate that the DC motor assembly used in the qualification test program was assembled with four fasteners.
Therefore, the use of two fasteners in the assembly in lieu of four fasteners constitute a deviation to the qualified design. Flowserve is evaluating this deviation to determine whether the condition could potentially affect the safety related function of DC powered Limitorque SMB/SB/SBD actuators.
This brush holder assembly mounting configuration is unique to Peerless -Winsmith DC electric motors built in a 56 frame size. Peerless-Winsmith DC motors with start torque ratings of 2, 5, 7.5, 10, 15 and 25 ft-lb. are built in a 56 frame size. Flowserve continues to work with the motor OEM to refine the scope of potentially affected motors through research of historic assembly records.
Limitorque actuators equipped with Peerless - Winsmith DC electric motors with start torque ratings of 40 ft-lb and larger are not affected by this issue. Limitorque actuators equipped with AC powered electric motors are not affected by this issue.
If there are questions, or addition information is required, please contact Chris Shaffer, Quality Manager (434) 522-4136.
Sincerely, Flowserve, Lynchburg VA Operations Limitorque Engineering Department Page 1 of2
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Quality Assurance Manager, Flowserve Corporation Flowserve - Lynchburg VA Operations 5114 Woodall Road Lynchburg VA, 24502 Flowserve, Lynchburg VA Operations Limitorque Engineering Department Limitorque Page 2 of2