###### Abstract  
The study investigates the collapse probability of a cabinet facility with a tuned mass damper (TMD) subjected to high- and low-frequency earthquakes. For this aim, a prototype of the cabinet in Korea is utilized for the numeric simulation. The accuracy of the finite element model is evaluated via the impact hammer tests. To mitigate the seismic response of the structure, a TMD system is developed whose properties are designed based on the outcomes from the modal analysis (i.e., modal frequencies and mode shapes). Furthermore, the influences of earthquake frequency contents on the seismic response are evaluated. The numeric analyses are conducted using a series of eighty earthquakes that are classified into two groups corresponding to low- and high-frequency motions. Finally, fragility curves are developed for the cabinet subjected to different ground motion sets. The results quantify the seismic vulnerability of the structure and demonstrate the influences of earthquake frequency contents and the vibration control system on the seismic response of the cabinet. c 20202010 10 July 20202015 July 20202010 June 20202010 July 20202010 June 20202010 July 202020  
For example, in March 2011, the Tohoku earthquake in Japan and subsequent tsunami caused severe consequences to the NPPs in Fukushima Daiichi and serious nuclear disaster, which directly affected the ambient environment and human life. This event affected various NPPs simultaneously at a site when eleven reactors of four plants had to be shut-down immediately [13; 14]. The Gyeongju (2016) and Pohang (2017) earthquakes that occurred with high-frequency contents had the potential damage to the continued functionality of related equipment in NPP secondary structures [15]. Additionally, the Virginia earthquake in the US (2011) was known as a motion with the intensity measure (IM) exceeded both operating basis and design basis earthquakes level at North Anna Station, although there were no significant damages after carrying out post-earthquake investigations [16]. Therefore, the studies on the seismic response of primary, secondary structures, and their components are always necessary. In the context of performance-based earthquake engineering (PBEE), the earthquake frequency content is known as an important parameter that can significantly affect the seismic response of the structure. For a high-frequency structure as an electrical cabinet, the high-frequency ground motion can amplify the structural response [15]. In this study, two suites of ground motions, including high-frequency (HF) and low-frequency (LF) earthquakes are considered where an earthquake is considered as low-frequency when its dominant frequency value is less than 10 Hz [17]. Electric cabinets play an important role in the operation of nuclear power plants; thus, their seismic performances need to be considered sufficiently. Being an indispensable part of NPP, there are numerous electrical devices attached inside the cabinet, such as switchboards, lighting panels, etc., and these functional devices are sensitive to the response of the main structure. For instance, the sensitivity of the acceleration response of the fusible switches and circuit breakers depends on their relative location in the cabinet [18; 19; 20]. For these nonstructural components, the grouping effects that refers to the combination of the cabinet facility are one of the key aspects that have been investigated in several works [21; 22; 23]. [PERSON] et al. [21; 22] developed the seismic fragility curves of the cabinet following two design standards, namely earthquake loss estimation methodology (HAZUS) [24] and Nuclear Regulatory Commission (NUREG) [25]. Numerous researchers have tried to invent various seismic control devices that help to mitigate unexpected vibration of the structural and nonstructural systems by dissipating the input seismic energy [26; 27; 28; 29; 30; 31]. In order to assess the efficiencies of a structure, important requirements should be satisfied, such as stability, serviceability, etc.