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http://dx.doi.org/10.1016/j.net.2020.05.015

Analysis of cladding failure in a BWR fuel rod using a SLICE-DO model of the FALCON code  

Khvostov, G. (Paul Scherrer Institut (PSI))
Publication Information
Nuclear Engineering and Technology / v.52, no.12, 2020 , pp. 2887-2900 More about this Journal
Abstract
Cladding failure in a fuel rod during operation in a BWR is analyzed using a FALCON code-based model. Comparative calculation with a neighbouring, intact rod is presented, as well. A considerable 'hot spot' effect in cladding temperature is predicted with the SLICE-DO model due to a thermal barrier caused by the localized crud deposition. Particularly significant overheating is expected to occur on the affected side of the cladding of the failed rod, in agreement with signs of significant localized crud deposition as revealed by Post Irradiation Examination. Different possibilities (criteria) are checked, and Pellet-Cladding Mechanical Interaction (PCMI) is shown to be one of the plausible potential threats. It is shown that PCMI could lead to discernible concentrated inelastic deformation in the overheated part of the cladding. None of the specific mechanisms considered can be experimentally or analytically identified as an only cause of the rod failure. However, according to the current calculation, a possibility of cladding failure by PCMI cannot be excluded if the crud thickness exceeded 300 ㎛.
Keywords
Crud deposition; Cladding failure; FALCON code; SLICE-DO model;
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Times Cited By KSCI : 2  (Citation Analysis)
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