Design Of Device Calibration Instrumentation On Safety Door In A Nuclear Power Plant

Security measures at nuclear power plants, radiation monitoring system is animportant part. Nuclear power plant radiation monitoring system by the processradiation monitoring systems, exhaust stream radiation monitoring system, regionalradiation monitoring system, individual dose management and access control arearadiation monitoring systems, environmental radiation monitoring systems and othersubsystems. Among them, the individual dose management and access control arearadiation monitoring system is mainly used to monitor and staff of different doses andradioactive contamination within the controlled area of the management station, themain components of its components are radiation detection instruments. Securitydoors as a typical radiation detection instruments, to get wider use in the system.Nuclear radiation detection device work installed on nuclear power plant safetydoor properly, detection accuracy and sensitivity to meet the requirements, is animportant prerequisite to protect nuclear power plant staff security, it must be fornuclear radiation detection devices nuclear power plant safety gate on the periodicinspection and calibration to ensure that nuclear reliability security doors.Instrumentation calibration using the traditional way is to use artificial means tocomplete the calibration process, but this would cause great human radiation hazards.In this paper, the design of a correcting means for correcting the work of auxiliaryinstrumentation staff.Nuclear power plant safety gate designed instrumentation calibration device, to acertain extent, reduce the staff by the radiological hazards, reducing the workload onthe nuclear safety door brought numerous instrumentation calibration process, theresults reflect the automation of nuclear power facilities. With the acceleration of theprocess of nuclear power, and constantly improve the technology of radiationdetection instruments, equipment automation will gradually replace the work of thestaff. The design of the device to some extent to meet the market demand, haspractical significance.The main contents of this paper:1Through the issue of nuclear safety gate background research instrument to detect the status quo and the full investigation, demonstrated the nuclear power plantsafety gate instrumentation calibration device and feasibility of practical significance,and proposed the establishment of standard equipment is expected to major technicalindicators.2The overall design of the system studied. The structure and working principleof nuclear safety doors, combined with the expected targets, completed the design andworking principle that technical solutions systems, a brief description of the role ofthe microcontroller, stepper motor and ball screw in them, point out the follow-up ofthe design the main part of the hardware to be designed. Finally, there is a greaterimpact on system performance to several factors.3We studied the nuclear power plant security door hardware circuit designinstrumentation calibration device. Completed a control chip selection. Achieve thesystem power supply design, the device used to ensure stable operation. Therealization of the display section and mode of operation of the design, the keyboardand the display used in combination to achieve the key observations show the resultsafter completion of basic human-computer interaction; complete radio-controlleddesign to realize the device from operating; through the serial port, realize computercontrol. Finally, to complete the design stepper motor drive control system to achievesingle-chip stepper motor control.4Studied the development of software systems. Throughout the developmentprocess, including microcontroller applications and computer programs. PC programwith the Visual Studio2008development platform, used to complete the processingand analysis of data and control to the next machine. SCM applications using KEILplatform development, completion of interactive, radio remote control, computercontrol and stepper motor control system software.5Assessment work to complete the test instrumentation for nuclear power plantsafety gate correction device performance indicators, the indicators are better than thedesign requirements, the successful establishment of a nuclear power plant safety gateinstrumentation calibration device standard equipment.In summary, nuclear power plant safety gate instrumentation calibration deviceof the present paper designed for instrumentation calibration process auxiliary staffwithin the nuclear power plant. By testing assessment, Shanghai Institute ofMeasurement and Testing meet the technical requirements of the standard device inthe project in the beginning. Means to achieve the multi-dimensional space the planeof movement of the moving, positioning, X-axis coordinate of the maximum distance is650mm, Y axis plane move the maximum distance is350mm, moving the Z axis ofthe plane distance is maximum1800mm, transfer source device rotation to achieve0°,90°,180°three positioning, movement accuracy less than1mm. Rational function,with a keyboard, and a computer-controlled three remote operation.