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.
作者
刘登奎
张劲松
李振臣
徐江
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)
出处
《辐射防护》
CAS
CSCD
北大核心
2020年第2期115-119,共5页
Radiation Protection
关键词
中放废物坑
石英砂
屏蔽
intermediate level radioactive waste pit
silica sand
shielding