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以CARR最严重的失控提棒ATWS为例,对CARR事故缓解系统设计改进造成的影响进行了全面的分析,分别就不同的失控棒最大速度(1~12 mm/s)和不同的落棒模式(同速掉落、自由落体和1.5s掉落)进行了分析计算,找出了CARR对与失控提棒ATWS所能承受的最大棒速,确定了4 mm/s的控制棒最大提升速度,对于失控提棒ATWS事故还采用了保守分析模型进行了敏感性分析,分析结果表明这种改进和棒速是合理的、安全的。
Taking CARR as the most serious uncontrolled lifting rod ATWS as an example, the impact of CARR accident mitigation system design improvement was analyzed thoroughly. The influences of different control rod maximum velocity (1 ~ 12 mm / s) and different falling modes (Falling at the same speed, free fall and 1.5s drop) were analyzed and calculated, the maximum rod speed that the CARR pair and the uncontrolled rod ATWS could bear was found, the maximum lifting speed of the control rod with 4 mm / s was determined, A conservative analysis model was also used to analyze the sensitivity of the uncontrolled lifting rod ATWS. The analysis shows that this improvement and rod speed are reasonable and safe.