中放废物坑扩孔操作的石英砂屏蔽实践  

A shielding practice with silica sands for an intermediate level radioactive waste pit in order to enlarge the opening

作　　者：刘登奎[1,2] 张劲松 李振臣[1] 徐江[1] LIU Dengkui;ZHANG Jinsong;LI Zhenchen;XU Jiang(Nuclear Power Institute of China,Chengdu 610041;Sichuan Engineering Laboratory for Nuclear Facilities Decommissioning and Radwaste Management,Chengdu 610041)

机构地区：[1]中国核动力研究设计院,成都610041 [2]四川省退役治理工程实验室,成都610041

出　　处：《辐射防护》2020年第2期115-119,共5页Radiation Protection

摘　　要：为了回取小坑口废物坑中的废物,利用了石英砂的流动性和吸尘器的抽吸功能,用石英砂屏蔽表面辐射水平为4.28Gy/h的坑内中放废物,将坑口辐射水平降至4.49μGy/h后,安全地实现了扩孔操作,实施屏蔽和拆除屏蔽过程都实现了远距离操作,极大降低了人员所受剂量,屏蔽实施与拆除操作人员的集体剂量仅为0.45人·mSv。In order to retrieve the waste from a waste pit with small opening,the silica sands packaged in a canvas bag was used to shield the intermediate level waste( ILW). The shielding depth was calculated with QAD-CG,and the filling and retrieve of silica sands was well prepared and practiced. The dose rate at the opening was reduced from 4.28 Gy/h to 4.49 μGy/h. The waste retrieve work went on smoothly. The personnel collective dose to set and dismantle the silica sands shielding facility is 0.45 men·m Sv in total.

关 键 词：中放废物坑 石英砂 屏蔽 

分 类 号：TL77[核科学技术—辐射防护及环境保护]