ACPR50S小型堆直流蒸汽发生器的屏蔽计算分析  

Preliminary Shielding Calculation and Analysis of OTSG for ACPR50S Small Modular Reactor

作　　者：盛选禹 凌晨 Sheng Xuanyu;Ling Chen(Department ofMechanical Engineering, TsinghuaUniversity, Beijing, 100084, China;Tianjin Research Institute for Advanced Equipment, Tsinghua University, Tianjin, 300300, China)

机构地区：[1]清华大学机械工程系,北京100084 [2]清华大学天津高端装备研究院,天津300300

出　　处：《核动力工程》2018年第2期66-71,共6页Nuclear Power Engineering

摘　　要：直流蒸汽发生器(OTSG)是ACPR50S小型堆的主要设备之一,OTSG内部高注量率中子会使OTSG主蒸汽出口处的水蒸汽产生活化,从而污染整个二回路系统。基于目前OTSG设计的屏蔽方案,本文对^(16)N的产生与传输进行了初步计算分析。结果表明,OTSG内部的中子注量率量级与蒸汽出口^(16)N放射性活度结果已经降低至较低水平,目前OTSG外壁的屏蔽材料与厚度可以满足正常运行工况下初步屏蔽设计的目标。Once-through steam generator （OTSG） is one of the main equipments of ACPR50S small modular reactor. High flux of neutrons in OTSG will cause steam activation, increase the dose rate at main steam outlet, thus polluting entire secondary loop of the reactor. We carried out a preliminary analysis of 16N generation ancl transport based on physical calculation of current Shielding design of OTSG. The results show that the neutron flux magnitude in the OTSG has been reduced to a low level. Activity of 16N in the OTSG outlet is approximately tens of Bq/cma.The results indicate that the material and thickness of current shielding structure of OTSG is satisfactory to meet the preliminary design goal under normal operating conditions.

关 键 词：OTSG 屏蔽 16N传输模型 蒸汽活化 

分 类 号：TL72[核科学技术—辐射防护及环境保护]