高浓度中子毒物钆的测量

重水堆核电站停堆控制主要使用钆作为机组中子毒物,在机组启动时,液体毒物注射停堆系统需要准备好并在退出保证停堆前处于完全可用状态,否则机组不允许启动。液体毒物注射停堆系统必须保证钆浓度达到化学控制范围,且液体毒物注射停堆系统的钆浓度属于电厂运行技术规格书关键参数。所以停堆系统钆浓度的准确分析数据直接影响机组安全,试验中用分光光度计对各浓度范围钆的测量,力求达到在提高测量的精确度和准确度的前提下,使得分析过程简单、快速。试验表明,在钆的浓度5000mg/kg至20000mg/kg范围内,使用分光光度法分析钆,分析误差可以控制在2%以下。

Heavy water reactor nuclear power plant shutdown control unit mainly uses gadolinium as neutron poison,in the start-up of the unit, liquid poison injection shutdown system need to be ready and in the exit to ensure shutdown is fully available,otherwise the unit is not allowed to start.Liquid poison injection shutdown system must ensure the chemical control of gadolinium gadolinium concentration.The concentration and liquid poison injection shutdown system is one of the key parameters of technical specification for power plant operation.The accurate analysis of the data so the shutdown system of gadolinium concentrations directly affect the unit safety test,using spectrophotometer to measure the concentration range of Gd, and strive to achieve in the premise of improving the measurement precision and accuracy,and makes analysis the process is simple,rapid.The results show that the concentration of 5000mg/kg to 20000mg/kg in the range of gadolinium, using spectrophotometric analysis of gadolinium, analysis error can be controlled below 2%.