在安全壳地坑过滤器纤维层形成的过程中,颗粒和部分纤维材料穿过过滤器进入下游的安全注入系统(RIS)/安全壳喷淋系统(EAS)流道,核安全监管单位要求对此展开评估,确定碎渣对于过滤器下游设备的影响。以秦山核电二期扩建工程为例,使用评估文件WCAP-16406中推荐的通用方法,对压水堆核电厂中地坑过滤器下游(堆芯外)设备的堵塞和磨损影响进行相应的计算和分析。 During the formation of the containment pit filter fiber layer, the particles and some of the fibrous material pass through the filter into the downstream RIS / SCA runner, which the nuclear safety regulatory authority requires This expands the assessment to determine the impact of debris on the downstream equipment of the filter. Taking the Qinshan NPP Phase II expansion project as an example, the general method recommended in WCAP-16406 is used to calculate the effect of blockage and wear on the downstream of the pit filter (outside the core) of the PWR nuclear power plant analysis.