Flow-Path Network Method Analysis of the Vibration Characteristics of a Group of Rods in Fluid : 1st Report, Simplified Model of the Vibration Characteristics of a Group of Rods in Fluid

A free-standing (FS) rack is a type of a spent nuclear fuel rack, which is just placed on a floor of a pool. For this characteristic, seismic loads can be reduced by fluid force and friction force, but a collision between a rack and another rack or a wall must be avoided. Therefore, it is necessary for designing an FS rack to figure out how it moves under seismic excitation. In this research, a dynamic model of an FS rack is developed considering seismic inertial force, friction force, and fluid force. This model consists of two submodels: a translation model, which simulates planar translational and rotational motion, and a rocking model, which simulates nonslide rocking motion. First, simulations with sinusoidal inertial force were conducted, changing values of a friction coefficient. Next, to validate this dynamic model, a miniature experiment was conducted. Finally, the model is applied to a real-size FS rack and actually observed seismic acceleration. It is found that translational movement of a rack varies depending on the value of friction coefficient in the simulation with sinusoidal and actual acceleration. Also, simulation results are similar to the experimental results in the aspects of translational and rocking motion provided friction coefficient is selected properly. Through this research, the knowledge is acquired that friction force plays a significant role in a motion of FS rack so that estimating and controlling a friction coefficient is important in designing an FS rack.

show abstract

Dynamic Model for Free-Standing Fuel Racks Under Seismic Excitation Considering Planar and Nonslide Rocking Motion

Sakamoto

Kan

Takai

et al. 2017

Journal of Computational and Nonlinear Dynamics

View full text Add to dashboard Cite

show abstract

Development of seismic analysis method of fast reactor core

Iwasaki

Hirota

Monde

et al. 2016

Transactions of the JSME (In Japanese)

View full text Add to dashboard Cite

To design fast reactor (FR) core components, seismic response must be evaluated in order to ensure structural integrity. Sophisticated analysis method has been developed to study the seismic response of FR core. The fast reactors consist of several hundred core assemblies which are hexagonal flexible beams embedded at the lower support plate in hexagonal arrangement, separated by small gaps, and immersed in a fluid. Core assemblies have no support for fixing to avoid the influence of thermal expansion and swelling. So a nonlinear analytical model needs to contain the collision and the friction between adjacent core assemblies and the fluid-structure interaction in horizontal direction, and behavior of raising from the lower support plate in vertical direction. If a big earthquake occurs, large displacement and impact force of each core assembly may cause a trouble in control rod insertability and core assembly strength. Therefore, it is very important to understand the behavior of core assemblies. This paper summarizes the details of the core assembly vibration analysis code in three dimensions (REVIAN-3D) to calculate three dimensional displacement and impact force of core assemblies.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Flow-Path Network Method Analysis of the Vibration Characteristics of a Group of Rods in Fluid : 1st Report, Simplified Model of the Vibration Characteristics of a Group of Rods in Fluid

Cited by 2 publications

References 0 publications

Dynamic Model for Free-Standing Fuel Racks Under Seismic Excitation Considering Planar and Nonslide Rocking Motion

Dynamic Model for Free-Standing Fuel Racks Under Seismic Excitation Considering Planar and Nonslide Rocking Motion

Development of seismic analysis method of fast reactor core

Contact Info

Product

Resources

About