反应堆非能动氢气复合器严重事故下消氢性能研究

Research on Hydrogen Elimination Performance of Passive Autocatalytic Recombiner of Reactor in Severe Accident

非能动氢气复合器(PAR)是核电厂主要的消氢措施。在严重事故下,某些裂变反应产生的特殊杂质(如I2、CsI、CO等)可能对催化剂产生有害的影响,为保证PAR消氢性能的可靠性,中毒机理研究十分必要。本文根据相关试验研究结果,从铂、钯金属原子分布结构、催化反应性面积两个方面对催化剂中毒效应进行机理分析,研究得出催化剂中金属原子的分布结构、进入PAR的实际毒物浓度等均是影响催化剂中毒效应的关键因素。

The passive autocatalytic recombiner(PAR)is the main measure of hydrogen elimination in nuclear power plant.In severe accident,the presence of some impurities(e.g.I2,CsI,CO etc.)produced by fission reaction can have an adverse impact on catalyst functioning,and the relevant poison mechanism study is urgently needed to ensure reliability of PAR’s performance.According to results of relevant tests,the mechanism study was conducted from distribution structure of Pt and Pd atoms and active surface of catalyst.It is concluded that the distribution structure of metal atoms in catalyst and the real concentration of poisons flowed in PAR are key factors in poisoning effect.