Experimental and Analytical Investigation on the Layer Inversion of Melt Pool during the Severe Accidents in the APR1400
During severe accidents, thermal load from the oxidic pool can be concentrated on the side wall of the RPV due to the thermal barrier effect in the thin metallic layer. The focusing effect of the metallic layer is mainly determined by the molten pool configuration in the lower head of the RPV. Thermodynamic analyses were performed to examine the final melt pool configuration during the severe accidents in the APR1400. As the representative accident scenarios, LBLOCA (Large Break Loss of Coolant Accident), MBLOCA (Medium Break Loss of Coolant Accident), SBLOCA (Small Break Loss of Coolant Accident), SBO (Station Black Out), and TLFW (Total Loss of Feed Water) were selected. The initial melt pool conditions, such as melt mass and melt pool temperature etc., were calculated using the SCDAP/RELAP5/MOD3.3 code. The thermodynamic analyses were performed using the GEMINI code. Combined with the GEMINI code calculations and a peer review of the RASPLAV/MASCA experimental results, the final melt pool configurations were determined for the major accident scenarios of the APR1400. The thermodynamic analyses results address the possibility of a melt pool layer inversion in the APR1400 accident sequences. Melt pool configurations were different in the representative accident sequences of the APR1400. In case of SBLOCA and LBLOCA where U/Zr ratio and initial melt pool temperature were relatively higher, layer inversion phenomena can be precluded. In other cases, however, possibility of layer inversion should be considered in evaluating melt pool configuration and consequent thermal load from the melt pool. For the precise evaluation on the layer inversion of molten core, a small-scale the test facility that can be handled with prototypic materials was constructed. As for the material compositions of the TLFW, preliminary test was successfully performed using the prototypic melt. Thermo-material inspection is in progress to validate the layer inversion of melt pool.
Layer Inversion Thermodynamic Analysis Prototypic Material Test
Kyoung-Ho Kang Rae-Joon Park Hee-Dong Kim Seong-Wan Hong
Korea Atomic Energy Research Institute 150 Dukjin-dong, Yusong-gu, Daejeon 305-353, Korea
国际会议
上海
英文
706-716
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）