Analysis of mechanical load on cladding induced by fuel swelling during power ramp in high burn-up rod by fuel performance code FEMAXI-6

Suzuki, Motoe; Uetsuka, Hiroshi; Saito, Hiroaki*

Nuclear Engineering and Design, 229(1), p.1 - 14, 2004/04

https://doi.org/10.1016/j.nucengdes.2003.11.017

Mechanical load on cladding induced by fuel swelling in a high burn-up BWR type rod has been analyzed by a fuel performance code FEMAXI-6. The code has been developed for the analysis of LWR fuel rod behaviors in normal operation and transient conditions using FEM. During a power ramp for the high burn-up rod, instantaneous pellet swelling can significantly exceed the level that is predicted by a "steady-rate" swelling model, causing a large circumferential strain in cladding. This phenomenon has been simulated by a new swelling model to take into account the fission gas bubble growth, and as a result it has been found that the new model can give reasonable predictions on cladding diameter expansion in comparison with post-irradiation data. In addition, a pellet-clad bonding model which has been incorporated in the code to assume firm mechanical coupling between pellet outer surface and cladding inner surface has predicted the generation of bi-axial stress state in the cladding during ramp.

Thermal analysis of boiling water capsule

Harayama, Yasuo; ; ; Nakamura, Jinichi; Uchida, Masaaki

JAERI-M 91-003, 38 Pages, 1991/02

JAERI-M-91-003.pdf:1.22MB

no abstracts in English

Power ramp test for LWR fuel in the JMTR

; ; ;

Japan-China Symp. on Research and Test Reactors, 11 Pages, 1988/00

no abstracts in English

ANALYTICAL EVALUATION ON THE PRESSURE INCREASE OF LONG-TERM EXPOSED LWR FUEL ROD BY POST-IRRADIATION EXAMINATION AND CODE CALCULATION BY FEMAXI-III

JAERI-M 84-021, 35 Pages, 1984/02

JAERI-M-84-021.pdf:1.09MB

no abstracts in English

Evaluation of Fuel Centerline Temperature of LWR Fuel Rods During Fast Rise to Operating Power - Results from Halden Power Ramp Test

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JAERI-M 82-127, 53 Pages, 1982/09

JAERI-M-82-127.pdf:1.49MB

no abstracts in English