The seismic risk of a nuclear power plant (NPP) depends on structures, systems and components (SSCs) that are seismically qualified to a design basis earthquake (DBE) in Canada or a safe shutdown earthquake (SSE) in the United States. On the other hand, there exist some components that are not essential to safety but their seismic interaction with seismically-qualified SSCs adversely affects the seismic risk of such SSCs. Rocking frames consisting of a rigid beam freely supported by piers (e.g., a 150 Ton spare turbine rotor, or a 100 Ton idle steam generator resting on triangular or trapezoidal rigid piers) are common to NPPs. Seismic interaction of such frames with seismically-qualified safety components or their host structure may be detrimental to nuclear safety as witnessed in the 2013 Arkansas Nuclear One accident where the drop of a 500 Ton stator adversely impacted the severe core damage frequency of the entire plant, negatively affecting the nuclear risk. In order to ensure nuclear safety, it is essential to quantify the risk of a heavy component’s drop owing to a rocking frame’s instability caused by design basis accidents including seismic. A rocking frame’s beam support may be concentric or eccentric with respect to the pier’s center of mass depending on it’s geometry, for example, triangular or trapezoidal respectively. The current nuclear standards, ASCE 43-19 and CSA N289.1-2018 are silent about rocking frames. Literature has also not addressed the eccentricity variation. This thesis addresses the gap on seismic qualification of rocking frames by, establishing an equivalent rocking block for rocking frames with symmetrical support eccentricities, obtaining the response of frames with unsymmetrical support eccentricities and finally examining the stability of the two types of frames under slide restrained conditions. / Thesis / Doctor of Philosophy (PhD) / Rocking frames, each consisting of a heavy rigid horizontal beam freely supported on unanchored rigid piers, are common to nuclear power plants (NPPs) (e.g., a turbine rotor freely supported by triangular or trapezoidal piers). The support points for the beam on the pier in such frames may be concentric or eccentric with respect to the pier’s center of mass as in a triangular or trapezoidal pier configuration. The current Canadian and American nuclear standards do not provide guidance on rocking frames. Support eccentricity variation has not been addressed in the literature. Consequently, the seismic risk of rocking frame configurations, common to NPPs, remains unknown. This thesis addresses this gap by employing an equivalent rocking block model for frames with symmetrical eccentricities, with an equation of motion representing those with unsymmetrical eccentricities; and examining the stability of the two under slide-restrained conditions.
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/28627 |
| Date | January 2023 |
| Creators | Dar, Amitabh |
| Contributors | El-Dakhakhni, Wael, Civil Engineering |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
| Type | Thesis |
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