NDLI: Seismic Capacity Tests of Motor Operated Fans in Ventilation Systems

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hirose, Jiro Suzuki, Kenichi Yoshika, Naoki
Copyright Year	2011
Abstract	Motor operated fans (M/O fans) of safety related ventilation systems in nuclear power plant facilities are required to maintain operability following earthquakes. M/O fans are designed to qualify the validated response capacity ranged from 2.3×9.8m/s2 to 2.6×9.8m/s2 at the bearing bracket depending on the type of fan in accordance with “JEAC4601-2008” [1] in Japan. Since the Regulatory Guide for Reviewing Seismic Design of Nuclear Power Reactor Facilities (Seismic Guide) revised in September 2006 [2] prescribes that the facilities in class S shall maintain their safety functions under seismic forces caused by a Design Basis Earthquake Ground Motion (DBEGM) Ss, a reevaluation is required for the seismic capacity of M/O fans to ensure operability. Japan Nuclear Energy Safety Organization (JNES) performed a series of seismic capacity tests for specimens of actual M/O fans, including a centrifugal fan with coupling and an axial fan without coupling. A program for a vibration test was developed to ensure its safety-related function to operate following earthquakes and to maintain the design flow rate and the design pressure. The tests were carried out by a shake table up to the response acceleration 7.5×9.8m/s2 at the bearing bracket in horizontal directions, and 3.0×9.8m/s2 in the vertical direction individually. As a result of the tests, the operability was qualified for each type of fan up to the above target acceleration values excluding a few exceptions. As a failure mode of the M/O centrifugal fan with coupling, the labyrinth seal was identified to be vulnerable to wear. The obtained data of seismic capacity are expected to be applied for the seismic reevaluation of M/O fans.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	181
Ending Page	189
Page Count	9
File Format	PDF
ISBN	9780791844588
DOI	10.1115/PVP2011-57928
Volume Number	Volume 8: Seismic Engineering
Conference Proceedings	ASME 2011 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2011-07-17
Publisher Place	Baltimore, Maryland, USA
Access Restriction	Subscribed
Subject Keyword	Fans Bearings Motors Flow (dynamics) Pressure Engines Earthquake resistant design Ventilation equipment Design Nuclear power Earthquakes Wear Safety Nuclear reactors Nuclear power stations Vibration tests Failure mechanisms
Content Type	Text
Resource Type	Article

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