Fault Tree Analisis Of Special Excavtor And Quantitative Security Management Research On Radiation Dust Accidents Of Cab Shielding System

This thesis relies on the Project of ‘Security Processing Technology and Equipment Research & Development on Nuclear Facilities’ Decommissioning and Nuclear Leaking’, choose the special excavator which is designed to work in highly radioactive environment as the research object, by using quantitative management method to study the dust cutting off performance of the cab radiation shielding system so as to realize goals such as guarantee of the safety of nuclear facilities decommissioning workers healthy and improvement of special excavator’s work efficiency.Firstly this article studies on the special excavator’s fault mold, setting its fault tree and using Analytic Hierarchy Process(AHP) to search the efficiency of the six consisting parts such as cab to improve excavator’s security, only to find that the key plan to raise the security performance of the special excavator is to raise the cab shielding system’s security. So use Preliminary Hazard Analysis(PHA) to recognize the potential accidents types of the cab shielding system, by nine factors comprehensive research and cluster analysis system faults as seat vibration fault, cabin noise fault, mechanical fault and radiation fault four parts and develop the form and emergency countermeasures in advance.Secondly it studies the fundamental theories on cab shielding system’s quantitative security management. On one hand, it offers a method of modern safety management M-MP2 R, which with safety regulation and emergency management as its core content. On the other hand, centering on quantitatively processing of safety information, it gives research on ways of quantitative security management, real-time safety quantitative management and risk pre-control safety quantitative management, basing on the M-MP2 R. Besides it designs the orthogonal test to achieve the relationships between the pressure difference in & outside the cab, temperature, relative humidity and the respirable dust concentration inside the cab shielding system.At last this thesis studies the application of safety quantitative management of dust radiation accident in the cab shielding system. Combining with Matlab to study their quantitative inner ships and count the quantitative coupling ways of temperature and relative humidity two factors under 400(Pa) pressure difference. As well as the temperature and relative humidity two factors threshold values when can make sure that the concentration of radiation dust in the cab shielding system among 0.4 milligram per cubic meter while with 400(Pa) pressure difference. At last, conduct the experiment and simulation results on the safety quantitative management model of dust radiation accident in the cab shielding system.This paper for one thing build the fault tree of special excavator, with AHP make sure the key part that affect special excavator’s security performance is the cab shielding system and its acquirements of radiation and dust protection. For another it concludes the optimization condition to prevent radiation dust of cab shielding system under highly radioactive environment. Still, the promotion of quantitative security management provides a reliable basis to supervise cab shielding system radiation dust accident, as well as references to further studies on safety quantitative management.