(A) mechanistic model for predicting transient fission gas release from UO2 fuel = UO2 핵연료로 부터의 과도상태 핵분열기체 방출 예측용 현상론적 모형

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A mechanistic model named KFGR-T has been developed to predict transient fission gas release from $UO_2$ fuel by emphasizing the importance of non-equilibrium behavior of fission gas bubbles. It takes into account relevant physical processes generally considered by other workers, and particularly, migration of fission gas bubbles through channels formed by extension of dislocations to grain boundaries during the transient heat-up stage, grain growth/grain-boundary sweeping during the isothermal annealing stage at high temperatures, and gas release through intergranular cracking. The present model was applied to calculate transient fission gas releases, and the calculated values were compared with the results of out-of pile experiments performed at Harwell, ANL, ORNL and JAERI with $UO_2$ fuel base-irradiated to burnups in the range of 18 to 35 MWd/kg-U. The absolute values and trend of fission gas releases calculated with use of the present model were in good agreement with the experimental data. A parametric study was also made to investigate the sensitivity of the present model to variables such as initial grain size, heating rate, temperature gradient and initial gas concentration, and these results were compared with the sensitivity of other models.
Advisors
Yoon, Young-Ku윤용구
Description
한국과학기술원 : 원자력공학과,
Publisher
한국과학기술원
Issue Date
1992
Identifier
60482/325007 / 000825923
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력공학과, 1992.8, [ xi, 97 p. ]

URI
http://hdl.handle.net/10203/48781
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=60482&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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