Environmental qualification testing was performed on a modified Limitorque torque switch for the torque switch safety functions in the Limitorque type SMB actuators located inside and outside containment in a nuclear power plant. The torque switch specimen was installed in a Limitorque SMB-1 electric actuator mounted on an 8” Velan gate valve and operated with a customized programmable logic controller to allow normal torque switch behaviour to be observed. The present paper describes the qualification testing performed. The modified torque switch was aged to a 30-year service life at the normal service conditions for both inside and outside containment. Aging included radiation, thermal and cycle aging. A seismic test and then a combined Loss of Coolant Accident (LOCA) and Main Steam Line Break (MSLB) steam accident simulation were followed. After each stage of aging, functional tests were done to confirm normal insulation resistance, normal contact resistance and normal operation.
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14th International Conference on Nuclear Engineering
July 17–20, 2006
Miami, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4242-8
PROCEEDINGS PAPER
Environmental Qualification of an Actuator Torque Switch
A. M. Chan,
A. M. Chan
Kinectrics, Inc., Toronto, ON, Canada
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S. L. Barreca,
S. L. Barreca
Kinectrics, Inc., Toronto, ON, Canada
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T. Kostela
T. Kostela
Ontario Power Generation, Inc., Bowmanville, ON, Canada
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A. M. Chan
Kinectrics, Inc., Toronto, ON, Canada
S. L. Barreca
Kinectrics, Inc., Toronto, ON, Canada
T. Kostela
Ontario Power Generation, Inc., Bowmanville, ON, Canada
Paper No:
ICONE14-89520, pp. 579-585; 7 pages
Published Online:
September 17, 2008
Citation
Chan, AM, Barreca, SL, & Kostela, T. "Environmental Qualification of an Actuator Torque Switch." Proceedings of the 14th International Conference on Nuclear Engineering. Volume 1: Plant Operations, Maintenance and Life Cycle; Component Reliability and Materials Issues; Codes, Standards, Licensing and Regulatory Issues; Fuel Cycle and High Level Waste Management. Miami, Florida, USA. July 17–20, 2006. pp. 579-585. ASME. https://doi.org/10.1115/ICONE14-89520
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