The following is a summary of information provided by the licensee via phone and email:
During installation of a replacement torque switch into a SMB-00 actuator at Beaver Valley Nuclear Power Station, technicians reported that the roller subassembly which connects the torque switch to the actuator drive train was loose and easily removed from the torque switch. The condition was identified on a quantity of two torque switches. Investigations by Flowserve indicate that the torque switch assemblies contain a manufacturing error resulting in the torque switch roller pin to be improperly secured in the tripper arm. This condition can potentially result in the roller subassembly becoming detached from the torque switch rendering the torque switch assembly non-functional. However, none of the components were installed in plant equipment.
The extent of condition investigation of the issue is ongoing, and the expected date of completion is on or before 2/28/25.
Known plant affected: Beaver Valley Nuclear Power Station
Contact information:
Chris Shaffer, Global Quality Manager - ACV for
Arie van Eyk, Director, Plant Manager
Flowserve US Inc.
5114 Woodall Road
Lynchburg VA 24502
(434) 258-5074
cshaffer@flowserve.com
- * * UPDATE ON 2/14/2025 AT 1501 EST FROM KYLE SAWYER TO ERNEST WEST * * *
The following is a synopsis of information received via phone and email:
Flowserve completed their final report pertaining to SMB-00 torque switch assemblies. Flowserve identified replacements parts under Limitorque part number 11501-010 are affected as well as original equipment switches contained in new SMB/SB-00 actuators.
Flowserve also provided an updated list of affected power plants. All affected plants have been notified by Flowserve.
Updated known affected U.S. nuclear power plant sites:
Beaver Valley
Watts Bar
Sequoyah
McGuire
Catawba
Point Beach
River Bend
Calvert Cliffs
Limerick
Notified R1DO (Henrion), R2DO (Penmetsa), R3DO (Orlikowski), R4DO (Dixon), and Part 21/50.55 Reactors (email)