用MELCOR程序分析600MWe核电厂乏燃料水池失去厂内外电源严重事故

Station Blackout Severe Accident Analysis of Spent Fuel Pool of 600MWe NPP by Using MELCOR Code

利用MELCOR程序建立了600MWe核电厂乏燃料水池计算模型,分别计算了在正常储存、正常换料和反应堆事故工况下,乏燃料水池失去厂内外电源严重事故序列。计算结果表明,燃料组件大约裸露一半后,锆水反应导致燃料熔化并产生大量氢气。分析了喷淋和注水对乏燃料水池事故的影响,分析结果表明,在燃料包壳失效前,以沸腾蒸发速率注水或喷淋能中止事故发展,并能使乏燃料水池水位缓慢回升。

Using MELCOR code,the spent fuel pool（SFP）of 600 MWe nuclear power plant（NPP）was modeled,and the station blackout severe accidents were calculated when the SFP was under normal condition,refuelling condition and the reactor accident condition.The calculation results show that fuel assemblies will melt down and hydrogen will generate,due to zirconium-water reaction,after the half height of fuel assemblies is uncovered.The influence of injection or spray on SFP accidents was analysed,and the results show that SFP accidents will be terminated and the water level of SFP will return up before fuel cladding damage if water is injected or sprayed into the SFP with the boiling evaporation mass rate.