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A study on evaluation of pebble flow velocity with modification of the kinematic model for pebble bed reactor

Title
A study on evaluation of pebble flow velocity with modification of the kinematic model for pebble bed reactor
Author
김종경
Keywords
Pebble bed reactor; Pebble flow velocity; Kinematic model; Pebble flow experiment; PBMR
Issue Date
2013-05
Publisher
Elsevier LTD
Citation
Annals of Nuclear Energy, May 2013, 55, P.322-330
Abstract
A pebble bed reactor is filled by a large number of pebbles, which are randomly piled up in the core region. During the process of fuel loading and extraction, the pebbles flow downward through the core. The basic physics of the dense granular flow such as pebble flow is not fully understood; hence, the dynamic core of the pebble bed reactor has been a subject of concern among designers and regulators. The kinematic model is one of the representative models for the reconstruction of the granular flow velocity, however, it is noted that there are some limitations in the reconstruction ability. In this study, a modified kinematic model was proposed to enhance the reconstruction ability of the pebble velocity profile. Pebble flow experiments were performed to derive the coefficients needed for the modified kinematic model and to verify the reconstruction ability and the applicability of the proposed method in the annular core. The modified kinematic model can contribute to accurate velocity evaluation as well as large applicability for the specific core types such as an annular core. Also, the results can be used for reference data in the design of a pebble bed reactor.
URI
https://www.sciencedirect.com/science/article/pii/S0306454912004902?via%3Dihubhttp://hdl.handle.net/20.500.11754/45455
ISSN
0306-4549
DOI
10.1016/j.anucene.2012.11.035
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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