Your browser does not support JavaScript, or it is disabled.Please check the site policy for more information. A crane hoists a dismantling mechanism to the top of an exhaust stack at the Fukushima No. 1 nuclear power plant site. (Pool) Delicate work got under way Aug. 1 at the crippled Fukushima No. 1 nuclear power plant to dismantle an unstable exhaust stack that is so highly contaminated by radiation the task must be done by remote control. Initial plans had called for the work to start in March, but the project was delayed by a failure among other things to confirm design plans that led operator Tokyo Electric Power Co. to deploy a crane that was not up to the task. The exhaust stack, which is 120 meters tall and 3.2 meters in diameter, was used for the No. 1 and No. 2 reactors. The work is regarded as a crucial phase in the decommissioning of the plant, a task that is projected to take decades and cost billions of yen. When the nuclear disaster unfolded in March 2011, vapor containing highly radioactive substances was released through the stack. Metal poles used to support the chimney were found to have been damaged following a hydrogen explosion at the No. 1 reactor. Rad...