A system for the calculation and visualisation of radiation field for maintenance support in nuclear power plants

Ohga, Yukiharu; Fukuda, Mitsuko; Shibata, Kiyotaka; Kawakami, Takashi; Matsuzaki, Tomokazu

doi:10.1093/rpd/nci014

Cited by 14 publications

(6 citation statements)

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“…Alternatively, the dose rate distribution can be computed with some numerical code, considering sources types and locations, the environment's geometry and materials characteristics, what is followed by [9], [12], [14].…”

Section: Computational Simulations For Radiation Dose Assessment In Nmentioning

confidence: 99%

Virtual Simulations of Nuclear Plants for Dose Assessment with On-line Measurements Collected by Networked Radiation Monitors

Mól¹,

Aghina²,

Jorge³

et al. 2008

2008 11th IEEE International Conference on Computational Science and Engineering - Workshops

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Section: Computational Simulations For Radiation Dose Assessment In Nmentioning

confidence: 99%

Virtual Simulations of Nuclear Plants for Dose Assessment with On-line Measurements Collected by Networked Radiation Monitors

Mól¹,

Aghina²,

Jorge³

et al. 2008

2008 11th IEEE International Conference on Computational Science and Engineering - Workshops

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“…So far, a system that visualizes calculated radiation dose rates in a virtual reality (VR) environment has been developed for mitigating high dose-rate environments inside an NPP [3]. Dose-rate distributions can be calculated with high accuracy based on the geometry of the facility, materials, and radioactive sources [4]. Moreover, computer simulations of the processes of cutting equipment and waste generation have been developed [5,6].…”

Section: Introductionmentioning

confidence: 99%

Real-time Simulation Methods for Robots with a Flexible Arm Based on Computer Graphics Technology

Seki¹,

Ueno²,

Hirano³

2021

IJMEA

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A robot with a flexible arm that is controlled with a remotely operated water-pressure mechanism has been developed for dismantling objects that are heavily contaminated by radioactive materials during decommissioning of nuclear power plants. The objective of this research is to develop a process planning support system and method that can improve the accuracy of estimating the time required by the robot to complete its dismantling activity, support recovery from delays, and determine the feasibility of conducting a dismantling process in the reactor building. Since the flexible arm has a more complex mechanism and shapes those that of multi-axis robots, unique movable arm structures were modeled with a tool for three-dimensional (3D) computer graphics (CG) technology. The 3D CG model was used to make valid operation sequences for planning the motion of the robot. With the help of a prototype system, motion planning can perform to calculate the duration needed for the robot to complete its operation. The calculated duration is then used for updating the planned duration of a specific activity in a dismantling schedule. To plan the robot behaviors for complex dismantling processes, a simplified planning method with few virtual controllers based on a spline inverse kinematics (IK) with a non-uniform rational B-spline (NURBS) curve for an arm comprised of pistons and cylinders pressurized by water was studied. A prototype system for planning the behaviors of the robot was evaluated, and it was confirmed that the movement trajectory of the robot and the three-dimensional isometric display could be visualized using the mesh model generated from point-cloud data used to make the environment model of the robot. It was also confirmed that the operations involved in a specific activity of the robot could be completed within the duration determined in the simulation.

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“…Virtual reality (VR) methods have been applied in conjunction with the VRDOSE software tool to simulate and plan dismantling work in an environment contaminated by radioactivity [5][6][7]. The distribution dose rate can be computed with numerical calculation codes that take into account source types and locations, the geometry of the environment, and the materials' characteristics [8][9][10]. A cutting process simulation has been developed and tested for the waste from equipment and piping components [11].…”

Section: Introductionmentioning

confidence: 99%

Evaluating Precise Quantity of Decommissioning Waste by Cutting Virtual 3D Models of Large Equipment

Seki¹,

Imamura²,

Nagase³

2020

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Equipment and piping components contaminated by radioactive materials and/or containing low-level irradiated waste must be cut, segmented, and packed into waste containers. Workers need to avoid overexposure to radiation in dismantling environments, and the number of waste containers for the pieces of equipment and piping components needs to be minimized. Thus, we developed an automatic planning method for virtually cutting 3D equipment with limitations on container size, radioactivity, weight, and dose rate. Cutting sequence data was used to formulate different cutting-work procedures, generate cut objects, and calculate the exposure during disassembling work. By calculating the required cutting length and dose-rate distribution in working environments for various cutting sequences of large equipment, the developed system is expected to aid in the planning of decommissioning. To utilize systems engineering in conjunction with elemental technologies, the following problems need to be solved; both weight and volume of the waste need to be controlled so that radioactive waste for decommissioning nuclear power plants is traceable. Identifying segmented equipment from a 3D model is key to calculating the number of volumetric segmented fragments and required number of containers. To evaluate exposure and amount of waste, we developed an automatic planning method for virtually cutting 3D equipment objects given constraints. Cutting sequence data was used to formulate different cutting workflows, generate cut objects, and calculate the exposure dose from disassembling work.

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A system for the calculation and visualisation of radiation field for maintenance support in nuclear power plants

Cited by 14 publications

References 0 publications

Virtual Simulations of Nuclear Plants for Dose Assessment with On-line Measurements Collected by Networked Radiation Monitors

Virtual Simulations of Nuclear Plants for Dose Assessment with On-line Measurements Collected by Networked Radiation Monitors

Real-time Simulation Methods for Robots with a Flexible Arm Based on Computer Graphics Technology

Evaluating Precise Quantity of Decommissioning Waste by Cutting Virtual 3D Models of Large Equipment

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