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- 2015
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Subcooled boiling is an important phenomenon for the design, operation and
safety analysis of nuclear power plant. However, the existing safety analysis
codes have some weaknesses in predicting subcooled boiling phenomena at
low-pressure conditions since they incorporates the wall boiling model developed
at high-pressure conditions. Thus, it is required to improve the predictive
capability of thermal-hydraulic analysis codes on subcooled boiling phenomenon
at low-pressure conditions. In this study, a couple of subcooled boiling
experiments at high- and low-pressure conditions are analyzed using a
three-dimensional thermal-hydraulic component code, CUPID. The CUPID code
was applied to the experiment of Christensen and Bartolomey performed at
high-pressure conditions, and it was shown that the CUPID code can provide a
reliable prediction on the propagation of the void fraction. However, the
simulation results of CUPID showed considerable discrepancies from the
experimental data of Zeitoun and SUBO test obtained at near-atmospheric
pressure when the default wall boiling models were used. The sensitivity
analysis of submodels in the heat partitioning model was performed to evaluate
the parametric effect of major factors on the void fraction distribution and to find
the optimized sets of submodels for low pressure conditions. Then, the modified
models of the CUPID codes are applied to perform the preliminary analysis of
the JNU subcooled boiling facility.
safety analysis of nuclear power plant. However, the existing safety analysis
codes have some weaknesses in predicting subcooled boiling phenomena at
low-pressure conditions since they incorporates the wall boiling model developed
at high-pressure conditions. Thus, it is required to improve the predictive
capability of thermal-hydraulic analysis codes on subcooled boiling phenomenon
at low-pressure conditions. In this study, a couple of subcooled boiling
experiments at high- and low-pressure conditions are analyzed using a
three-dimensional thermal-hydraulic component code, CUPID. The CUPID code
was applied to the experiment of Christensen and Bartolomey performed at
high-pressure conditions, and it was shown that the CUPID code can provide a
reliable prediction on the propagation of the void fraction. However, the
simulation results of CUPID showed considerable discrepancies from the
experimental data of Zeitoun and SUBO test obtained at near-atmospheric
pressure when the default wall boiling models were used. The sensitivity
analysis of submodels in the heat partitioning model was performed to evaluate
the parametric effect of major factors on the void fraction distribution and to find
the optimized sets of submodels for low pressure conditions. Then, the modified
models of the CUPID codes are applied to perform the preliminary analysis of
the JNU subcooled boiling facility.
목차
Ⅰ. 서론 1Ⅱ. CUPID 코드 4Ⅲ. 미포화비등 모델 71. MARS-KS 코드 모델 72. CFX-12.1, CUPID 코드 모델 81) 열분배모델 내 부모델 112) CFX-12.1 코드의 열분배모델 내 부모델 153) CUPID 코드의 열분배모델 내 부모델 16Ⅳ. 미포화비등 실험 해석 181. 고압 미포화비등 실험 181) Christensen 실험 182) Bartolomey 실험 232. 저압 미포화비등 실험 273) Zeitoun 실험 274) SUBO 실험 323. 저압 미포화비등 조건의 CUPID 코드 열분배모델 내 부모델 수정 341) Zeitoun 실험 재해석 372) SUBO 실험 재해석 39Ⅴ. CUPID 코드를 이용한 제주대 미포화비등 장치 예비 해석 431. 실험장치 432. CUPID 예비 해석 45Ⅵ. 결론 47REFERENCE 49APPENDIX A. 미포화비등 해석을 위한 mesh 최적화 53
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