Anti-radiation Excavator Safety Work Chamber Radiation Shielding Characteristics And Optimization Design Research

The world’s nuclear generation accounted for 16% of the world’s total output. By 2011, the global total of grid generation of nuclear power reactors, 435, under construction or to be built nuclear power reactors, 222, are facing decommissioning nuclear facilities and nuclear emergency safe disposal. Our country is nuclear power, military and civilian nuclear facilities is more, need to strengthen the decommissioning nuclear facilities and safe disposal of nuclear leakage accident disposal technology and equipment research. Treatment and disposal of decommissioning nuclear facilities and nuclear leakage accident, radiation directly threaten the health and life of workers, general operation technology and equipment can’t work. In order to ensure that workers, public health and safety, and protect the ecological environment, free or reduced to the closed nuclear radiation hazards and other hazards. Therefore, in the process of nuclear decommissioning the excavator operator, such as not to take protective measures, may face the radiation damage of the body, special equipment needs to be developing nuclear decommissioning. With its enhance safety work chamber shielding effect.At present, the modified operation and equipment can only to deal with nar not polluted environmucleent, with high radiation decommissioning of nuclear facilities and nuclear leakage accident, modified operation and equipment in the job when still can cause larger radiation damage. Therefore, in order to ensure the personal safety of radioactive environment homework personnel, developing special security operation the cockpit, to safeguard nuclear facilities decommissioning operation and the smooth implementation of nuclear accident emergency action. Therefore, this thesis focuses on security work chamber radiation shielding properties and its structure has been optimized design research. The main research content is as follows: At present, the modified operation and equipment can only to deal with nuclear not polluted environment, with high radiation decommissioning of nuclear facilities and nuclear leakage accident, modified operation and equipment in the job when still can cause larger radiation damage. Therefore, in order to ensure the personal safety of radioactive environment homework personnel, developing special security operation the cockpit, to safeguard nuclear facilities decommissioning operation and the smooth implementation of nuclear accident emergency action. Therefore, this thesis focuses on security work chamber radiation shielding properties and its structure has been optimized design research. The main research content is as follows:Firstly,excavator safety work chamber model is established and the pilot human simulation model, using the MCNP5 program to simulate the safety work chamber in different distance(8 m, 6 m, 4 m, 2 m), different materials(tungsten nickel alloy, lead, stainless steel 304) shielding performance, and experiments have been carried out to verify the simulation results;Secondly, analysis of the affecting the safe work chamber shielding performance of the anti-radiation excavator main factors, namely the type of radiation sources(60 co)(point source and collimating source), different spacing(safety test distance: 10 m, normal operating range: 7 m), the safety work chamber different shielding materials(tungsten nickel alloy, lead, stainless steel 304) and different structure(totally enclosed, lead glass Windows) on its gamma ray resistance of the shield;Thirdly, according to the results of simulation calculation, each part of the human body were discussed by the dose rate values and work in space dose rate, the evaluation of the security work chamber shielding effect, and on the basis of ionizing radiation protection and radioactive source security work of basic standards(GB18871-2002);Fourthly,on the basis of the above analysis results, the strengthening measures are proposed in view of the human central shielding, include: ① to install a new driver body shield wall(made from lead glass) or increase the thickness of the protective clothing(when spacing can change); ② the work chamber with a window structure, can be leaded glass of lead appropriate increase. ③ source of point source, the head of the human body radiation protection should be considered.